// This file is part of the 64k demo project.
// It implements the sequence compiler tool.
// Converts a text-based timeline description into C++ code.

#include <algorithm>
#include <cmath>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <sstream>
#include <string>
#include <vector>

struct EffectEntry {
  std::string class_name;
  std::string start;
  std::string end;
  std::string priority;
  std::string extra_args;
  std::vector<std::pair<std::string, std::string>> params; // key=value pairs
};

struct SequenceEntry {
  std::string start_time;
  std::string priority;
  std::string end_time; // Optional: -1.0f means "no explicit end"
  std::string name;     // Optional: human-readable name for Gantt charts
  std::vector<EffectEntry> effects;
};

std::string trim(const std::string& str) {
  size_t first = str.find_first_not_of(" \t");
  if (std::string::npos == first)
    return ""; // String is all whitespace, return empty string
  size_t last = str.find_last_not_of(" \t");
  return str.substr(first, (last - first + 1));
}

// Parse key=value parameters from extra_args string
// Example: "color=1.0,0.0,0.0 decay=0.95" -> {{"color", "1.0,0.0,0.0"},
// {"decay", "0.95"}}
std::vector<std::pair<std::string, std::string>>
parse_parameters(const std::string& args) {
  std::vector<std::pair<std::string, std::string>> params;
  std::istringstream ss(args);
  std::string token;

  while (ss >> token) {
    size_t eq_pos = token.find('=');
    if (eq_pos != std::string::npos) {
      std::string key = token.substr(0, eq_pos);
      std::string value = token.substr(eq_pos + 1);
      params.push_back({key, value});
    }
  }

  return params;
}

// Check if an effect is a post-process effect
bool is_post_process_effect(const std::string& class_name) {
  // List of known post-process effects
  static const std::vector<std::string> post_process_effects = {
      "FadeEffect",        "FlashEffect",           "GaussianBlurEffect",
      "SolarizeEffect",    "VignetteEffect",        "ChromaAberrationEffect",
      "DistortEffect",     "ThemeModulationEffect", "CNNEffect",
      "PassthroughEffect", "CircleMaskEffect"};
  return std::find(post_process_effects.begin(), post_process_effects.end(),
                   class_name) != post_process_effects.end();
}

// Calculate adaptive tick interval based on timeline duration
int calculate_tick_interval(float max_time) {
  if (max_time <= 5)
    return 1;
  if (max_time <= 40)
    return 2;
  if (max_time <= 100)
    return 5;
  if (max_time <= 200)
    return 10;
  return 20;
}

// Timeline analysis result: max time and sequences sorted by start time
struct TimelineMetrics {
  float max_time;
  std::vector<SequenceEntry> sorted_sequences;
};

// Calculate sequence end time (explicit or derived from latest effect)
float get_sequence_end(const SequenceEntry& seq) {
  float seq_start = std::stof(seq.start_time);
  if (seq.end_time != "-1.0") {
    return seq_start + std::stof(seq.end_time);
  }
  float seq_end = seq_start;
  for (const auto& eff : seq.effects) {
    seq_end = std::max(seq_end, seq_start + std::stof(eff.end));
  }
  return seq_end;
}

// Analyze timeline: find max time and sort sequences by start time
TimelineMetrics analyze_timeline(const std::vector<SequenceEntry>& sequences,
                                 const std::string& demo_end_time) {
  float max_time = demo_end_time.empty() ? 0.0f : std::stof(demo_end_time);
  for (const auto& seq : sequences) {
    float seq_start = std::stof(seq.start_time);
    for (const auto& eff : seq.effects) {
      max_time = std::max(max_time, seq_start + std::stof(eff.end));
    }
    if (seq.end_time != "-1.0") {
      max_time = std::max(max_time, seq_start + std::stof(seq.end_time));
    }
  }

  std::vector<SequenceEntry> sorted = sequences;
  std::sort(sorted.begin(), sorted.end(),
            [](const SequenceEntry& a, const SequenceEntry& b) {
              return std::stof(a.start_time) < std::stof(b.start_time);
            });

  return {max_time, sorted};
}

// Analyze effect stacking depth across the timeline
void analyze_effect_depth(const std::vector<SequenceEntry>& sequences,
                          const std::string& demo_end_time,
                          float sample_rate = 10.0f) {
  TimelineMetrics metrics = analyze_timeline(sequences, demo_end_time);
  float max_time = metrics.max_time;

  if (max_time <= 0.0f) {
    std::cout << "\n=== Effect Depth Analysis ===\n";
    std::cout << "No effects found in timeline.\n";
    return;
  }

  // Build list of all effects with absolute times
  struct ActiveEffect {
    std::string name;
    float start_time;
    float end_time;
    int priority;
  };
  std::vector<ActiveEffect> all_effects;

  for (const auto& seq : sequences) {
    float seq_start = std::stof(seq.start_time);
    float seq_end = get_sequence_end(seq);

    for (const auto& eff : seq.effects) {
      float eff_start = seq_start + std::stof(eff.start);
      float eff_end = seq_start + std::stof(eff.end);

      // Clamp effect end to sequence end if specified
      if (seq.end_time != "-1.0") {
        eff_end = std::min(eff_end, seq_end);
      }

      all_effects.push_back(
          {eff.class_name, eff_start, eff_end, std::stoi(eff.priority)});
    }
  }

  // Sample timeline at regular intervals
  const float dt = 1.0f / sample_rate;
  int max_depth = 0;
  float max_depth_time = 0.0f;
  std::vector<int> depth_histogram(21, 0); // Track depths 0-20+

  struct PeakInfo {
    float time;
    int depth;
    std::vector<std::string> effects;
  };
  std::vector<PeakInfo> peaks;

  for (float t = 0.0f; t <= max_time; t += dt) {
    int depth = 0;
    std::vector<std::string> active_effects;

    for (const auto& eff : all_effects) {
      if (t >= eff.start_time && t < eff.end_time) {
        depth++;
        active_effects.push_back(eff.name);
      }
    }

    // Update max depth
    if (depth > max_depth) {
      max_depth = depth;
      max_depth_time = t;
    }

    // Record histogram
    int hist_idx = std::min(depth, 20);
    depth_histogram[hist_idx]++;

    // Record peaks (>5 effects)
    if (depth > 5 && (peaks.empty() || t - peaks.back().time > 0.5f)) {
      peaks.push_back({t, depth, active_effects});
    }
  }

  // Print analysis report
  std::cout << "\n=== Effect Depth Analysis ===\n";
  std::cout << "Timeline duration: " << max_time << "s\n";
  std::cout << "Total effects: " << all_effects.size() << "\n";
  std::cout << "Sample rate: " << sample_rate << " Hz (every " << dt << "s)\n";
  std::cout << "\n";

  std::cout << "Max concurrent effects: " << max_depth
            << " at t=" << max_depth_time << "s\n";
  std::cout << "\n";

  // Print histogram
  std::cout << "Effect Depth Distribution:\n";
  std::cout << "Depth | Count   | Percentage | Bar\n";
  std::cout << "------|---------|------------|"
               "-------------------------------------\n";

  int total_samples =
      std::accumulate(depth_histogram.begin(), depth_histogram.end(), 0);

  for (size_t i = 0; i < depth_histogram.size(); ++i) {
    if (depth_histogram[i] == 0 && i > max_depth)
      continue;

    float percentage = 100.0f * depth_histogram[i] / total_samples;
    int bar_length = (int)(percentage / 2.0f); // Scale to ~50 chars max

    std::cout << std::setw(5) << (i < 20 ? std::to_string(i) : "20+") << " | "
              << std::setw(7) << depth_histogram[i] << " | " << std::setw(9)
              << std::fixed << std::setprecision(1) << percentage << "% | ";

    for (int j = 0; j < bar_length; ++j) {
      std::cout << "█";
    }
    std::cout << "\n";
  }

  // Print bottleneck warnings
  if (max_depth > 5) {
    std::cout << "\n⚠ WARNING: Performance bottlenecks detected!\n";
    std::cout << "Found " << peaks.size()
              << " time periods with >5 effects:\n\n";

    int peak_count = 0;
    for (const auto& peak : peaks) {
      if (peak_count >= 10)
        break; // Limit output

      std::cout << "  t=" << std::fixed << std::setprecision(2) << peak.time
                << "s: " << peak.depth << " effects [ ";

      // Show first 5 effects
      for (size_t i = 0; i < std::min(size_t(5), peak.effects.size()); ++i) {
        std::cout << peak.effects[i];
        if (i < peak.effects.size() - 1)
          std::cout << ", ";
      }
      if (peak.effects.size() > 5) {
        std::cout << " +" << (peak.effects.size() - 5) << " more";
      }
      std::cout << " ]\n";

      peak_count++;
    }

    if (peaks.size() > 10) {
      std::cout << "  ... and " << (peaks.size() - 10) << " more peaks\n";
    }
  } else {
    std::cout << "\n✓ No significant bottlenecks detected (max depth: "
              << max_depth << " <= 5)\n";
  }

  std::cout << "\n";
}

// Generate ASCII Gantt chart for timeline visualization
void generate_gantt_chart(const std::string& output_file,
                          const std::vector<SequenceEntry>& sequences,
                          float bpm, const std::string& demo_end_time) {
  std::ofstream out(output_file);
  if (!out.is_open()) {
    std::cerr << "Warning: Could not open Gantt chart output file: "
              << output_file << "\n";
    return;
  }

  TimelineMetrics metrics = analyze_timeline(sequences, demo_end_time);
  float max_time = metrics.max_time;

  // Chart configuration
  const int chart_width = 100;
  const float time_scale = chart_width / max_time;

  out << "Demo Timeline Gantt Chart\n";
  out << "====================================================================="
         "=========\n";
  out << "BPM: " << bpm << ", Duration: " << max_time << "s";
  if (!demo_end_time.empty()) {
    out << " (explicit end)";
  }
  out << "\n\n";

  // Time axis header with adaptive tick interval
  const int tick_interval = calculate_tick_interval(max_time);
  out << "Time (s): ";
  for (int i = 0; i <= (int)max_time; i += tick_interval) {
    out << i;
    int spacing = (i < 10) ? 4 : (i < 100) ? 3 : 2;
    if (i + tick_interval <= max_time) {
      for (int j = 0; j < spacing; ++j)
        out << " ";
    }
  }
  out << "\n";
  out << "          ";
  for (int i = 0; i < chart_width; ++i) {
    // Check if this column aligns with any tick mark
    bool is_tick = false;
    for (int t = 0; t <= (int)max_time; t += tick_interval) {
      if (std::abs(i - (int)(t * time_scale)) < 1) {
        is_tick = true;
        break;
      }
    }
    out << (is_tick ? "|" : "-");
  }
  out << "\n\n";

  // Draw sequences and effects
  for (size_t seq_idx = 0; seq_idx < metrics.sorted_sequences.size();
       ++seq_idx) {
    const auto& seq = metrics.sorted_sequences[seq_idx];
    float seq_start = std::stof(seq.start_time);
    float seq_end = get_sequence_end(seq);

    // Draw sequence bar
    out << "SEQ@" << seq_start << "s";
    if (!seq.name.empty()) {
      out << " \"" << seq.name << "\"";
    }
    out << " [pri=" << seq.priority << "]";
    if (seq.end_time != "-1.0") {
      out << " [END=" << seq_end << "s]";
    }
    out << "\n";

    int start_col = (int)(seq_start * time_scale);
    int end_col = (int)(seq_end * time_scale);
    out << "          ";
    for (int i = 0; i < chart_width; ++i) {
      if (i >= start_col && i < end_col)
        out << "█";
      else
        out << " ";
    }
    out << "  (" << seq_start << "-" << seq_end << "s)\n";

    // Draw effects within sequence
    for (const auto& eff : seq.effects) {
      float eff_start = seq_start + std::stof(eff.start);
      float eff_end = seq_start + std::stof(eff.end);

      // Truncate if sequence has explicit end time
      if (seq.end_time != "-1.0") {
        eff_end = std::min(eff_end, seq_end);
      }

      out << "  " << eff.class_name << " [pri=" << eff.priority << "]";
      if (eff_end < eff_start) {
        out << " *** INVALID TIME RANGE ***";
      }
      out << "\n";
      out << "          ";

      int eff_start_col = (int)(eff_start * time_scale);
      int eff_end_col = (int)(eff_end * time_scale);

      for (int i = 0; i < chart_width; ++i) {
        if (i >= eff_start_col && i < eff_end_col) {
          out << "▓";
        } else if (i >= start_col && i < end_col) {
          out << "·"; // Show sequence background
        } else {
          out << " ";
        }
      }
      out << "  (" << eff_start << "-" << eff_end << "s)\n";
    }

    // Add separator between sequences
    if (seq_idx < metrics.sorted_sequences.size() - 1) {
      out << "          ";
      for (int i = 0; i < chart_width; ++i) {
        out << "─";
      }
      out << "\n\n";
    } else {
      out << "\n";
    }
  }

  out << "====================================================================="
         "=========\n";
  out << "Legend: █ Sequence  ▓ Effect  · Sequence background\n";
  out << "Priority: Higher numbers render later (on top)\n";

  out.close();
  std::cout << "Gantt chart written to: " << output_file << "\n";
}

// Generate HTML/SVG Gantt chart for timeline visualization
void generate_gantt_html(const std::string& output_file,
                         const std::vector<SequenceEntry>& sequences, float bpm,
                         const std::string& demo_end_time) {
  std::ofstream out(output_file);
  if (!out.is_open()) {
    std::cerr << "Warning: Could not open HTML Gantt output file: "
              << output_file << "\n";
    return;
  }

  TimelineMetrics metrics = analyze_timeline(sequences, demo_end_time);
  float max_time = metrics.max_time;

  const int svg_width = 1400;
  const int row_height = 30;
  const int effect_height = 20;
  const int margin_left = 250;
  const int margin_top = 60;
  const float time_scale = (svg_width - margin_left - 50) / max_time;

  // Count total rows needed
  int total_rows = 0;
  for (const auto& seq : sequences) {
    total_rows += 1 + seq.effects.size(); // 1 for sequence + N for effects
  }

  const int svg_height = margin_top + total_rows * row_height + 40;

  out << "<!DOCTYPE html>\n<html>\n<head>\n";
  out << "<meta charset=\"UTF-8\">\n";
  out << "<title>Demo Timeline - BPM " << bpm << "</title>\n";
  out << "<style>\n";
  out << "body { font-family: 'Courier New', monospace; margin: 20px; "
         "background: #1e1e1e; color: #d4d4d4; }\n";
  out << "h1 { color: #569cd6; }\n";
  out << ".info { background: #252526; padding: 10px; border-radius: 4px; "
         "margin: 10px 0; }\n";
  out << "svg { background: #252526; border-radius: 4px; }\n";
  out << ".sequence-bar { fill: #3a3a3a; stroke: #569cd6; stroke-width: 2; }\n";
  out << ".effect-bar { fill: #4ec9b0; opacity: 0.8; stroke: #2a7a6a; "
         "stroke-width: 1; }\n";
  out << ".effect-bar.invalid { fill: #f48771; stroke: #d16969; }\n";
  out << ".label { fill: #d4d4d4; font-size: 12px; }\n";
  out << ".label.effect { fill: #cccccc; font-size: 11px; }\n";
  out << ".axis-line { stroke: #6a6a6a; stroke-width: 1; }\n";
  out << ".axis-label { fill: #858585; font-size: 10px; }\n";
  out << ".time-marker { stroke: #444444; stroke-width: 1; stroke-dasharray: "
         "2,2; }\n";
  out << "rect:hover { opacity: 1; }\n";
  out << "title { font-size: 11px; }\n";
  out << "</style>\n</head>\n<body>\n";

  out << "<h1>Demo Timeline Gantt Chart</h1>\n";
  out << "<div class=\"info\">\n";
  out << "<strong>BPM:</strong> " << bpm << " | ";
  out << "<strong>Duration:</strong> " << max_time << "s";
  if (!demo_end_time.empty()) {
    out << " (explicit end)";
  }
  out << " | <strong>Sequences:</strong> " << sequences.size() << "\n";
  out << "</div>\n\n";

  out << "<svg width=\"" << svg_width << "\" height=\"" << svg_height
      << "\" xmlns=\"http://www.w3.org/2000/svg\">\n";

  // Draw time axis with adaptive tick interval
  const int tick_interval = calculate_tick_interval(max_time);
  out << "  <!-- Time axis -->\n";
  out << "  <line x1=\"" << margin_left << "\" y1=\"" << margin_top - 10
      << "\" x2=\"" << (svg_width - 50) << "\" y2=\"" << margin_top - 10
      << "\" class=\"axis-line\"/>\n";

  for (int t = 0; t <= (int)max_time; t += tick_interval) {
    int x = margin_left + (int)(t * time_scale);
    out << "  <line x1=\"" << x << "\" y1=\"" << margin_top - 15 << "\" x2=\""
        << x << "\" y2=\"" << margin_top - 5 << "\" class=\"axis-line\"/>\n";
    out << "  <text x=\"" << x << "\" y=\"" << margin_top - 20
        << "\" class=\"axis-label\" text-anchor=\"middle\">" << t
        << "s</text>\n";
    // Draw vertical time markers
    out << "  <line x1=\"" << x << "\" y1=\"" << margin_top << "\" x2=\"" << x
        << "\" y2=\"" << svg_height - 20 << "\" class=\"time-marker\"/>\n";
  }

  // Draw sequences and effects
  int y_offset = margin_top;
  for (size_t seq_idx = 0; seq_idx < metrics.sorted_sequences.size();
       ++seq_idx) {
    const auto& seq = metrics.sorted_sequences[seq_idx];
    float seq_start = std::stof(seq.start_time);
    float seq_end = get_sequence_end(seq);

    int x1 = margin_left + (int)(seq_start * time_scale);
    int x2 = margin_left + (int)(seq_end * time_scale);

    // Draw sequence bar
    out << "  <!-- Sequence -->\n";
    out << "  <rect x=\"" << x1 << "\" y=\"" << y_offset << "\" width=\""
        << (x2 - x1) << "\" height=\"" << row_height
        << "\" class=\"sequence-bar\">\n";
    out << "    <title>SEQ@" << seq_start << "s";
    if (!seq.name.empty()) {
      out << " \"" << seq.name << "\"";
    }
    out << " [pri=" << seq.priority << "] (" << seq_start << "-" << seq_end
        << "s)</title>\n";
    out << "  </rect>\n";

    // Draw sequence label
    out << "  <text x=\"10\" y=\"" << (y_offset + row_height / 2 + 4)
        << "\" class=\"label\">SEQ@" << seq_start << "s";
    if (!seq.name.empty()) {
      out << " \"" << seq.name << "\"";
    }
    out << " [pri=" << seq.priority << "]</text>\n";

    y_offset += row_height;

    // Draw effects
    for (const auto& eff : seq.effects) {
      float eff_start = seq_start + std::stof(eff.start);
      float eff_end = seq_start + std::stof(eff.end);

      if (seq.end_time != "-1.0") {
        eff_end = std::min(eff_end, seq_end);
      }

      bool invalid = eff_end < eff_start;
      int eff_x1 = margin_left + (int)(eff_start * time_scale);
      int eff_x2 = margin_left + (int)(eff_end * time_scale);
      int eff_width = std::max(2, eff_x2 - eff_x1);

      out << "  <rect x=\"" << eff_x1 << "\" y=\"" << (y_offset + 5)
          << "\" width=\"" << eff_width << "\" height=\"" << effect_height
          << "\" class=\"effect-bar" << (invalid ? " invalid" : "") << "\">\n";
      out << "    <title>" << eff.class_name << " [pri=" << eff.priority
          << "] (" << eff_start << "-" << eff_end << "s)"
          << (invalid ? " *** INVALID TIME RANGE ***" : "") << "</title>\n";
      out << "  </rect>\n";

      out << "  <text x=\"20\" y=\"" << (y_offset + effect_height)
          << "\" class=\"label effect\">" << eff.class_name
          << " [pri=" << eff.priority << "]" << (invalid ? " ⚠" : "")
          << "</text>\n";

      y_offset += row_height;
    }

    // Add separator between sequences
    if (seq_idx < metrics.sorted_sequences.size() - 1) {
      out << "  <!-- Separator -->\n";
      out << "  <line x1=\"" << margin_left << "\" y1=\"" << (y_offset + 5)
          << "\" x2=\"" << (svg_width - 50) << "\" y2=\"" << (y_offset + 5)
          << "\" style=\"stroke:#444444; stroke-width:1; "
             "stroke-dasharray:4,2;\"/>\n";
      y_offset += 10; // Extra spacing after separator
    }
  }

  // Legend
  out << "  <!-- Legend -->\n";
  out << "  <rect x=\"10\" y=\"" << (svg_height - 15)
      << "\" width=\"20\" height=\"10\" class=\"sequence-bar\"/>\n";
  out << "  <text x=\"35\" y=\"" << (svg_height - 7)
      << "\" class=\"axis-label\">Sequence</text>\n";
  out << "  <rect x=\"120\" y=\"" << (svg_height - 15)
      << "\" width=\"20\" height=\"10\" class=\"effect-bar\"/>\n";
  out << "  <text x=\"145\" y=\"" << (svg_height - 7)
      << "\" class=\"axis-label\">Effect</text>\n";
  out << "  <rect x=\"220\" y=\"" << (svg_height - 15)
      << "\" width=\"20\" height=\"10\" class=\"effect-bar invalid\"/>\n";
  out << "  <text x=\"245\" y=\"" << (svg_height - 7)
      << "\" class=\"axis-label\">Invalid Time Range</text>\n";

  out << "</svg>\n";
  out << "<div class=\"info\">\n";
  out << "<strong>Tip:</strong> Hover over bars to see details. ";
  out << "Higher priority numbers render later (on top).\n";
  out << "</div>\n";
  out << "</body>\n</html>\n";

  out.close();
  std::cout << "HTML Gantt chart written to: " << output_file << "\n";
}

// Convert beat notation to time in seconds
// Supports: "64b" or "64" (beats), "32.0s" or "32.0" with decimal point
// (seconds)
std::string convert_to_time(const std::string& value, float bpm) {
  std::string val = value;

  // Check for explicit 's' suffix (seconds) - return as-is
  if (!val.empty() && val.back() == 's') {
    val.pop_back();
    return val;
  }

  // Check for explicit 'b' suffix (beats) - strip and convert
  if (!val.empty() && val.back() == 'b') {
    val.pop_back();
  }

  // DEFAULT: All numbers (with or without 'b' suffix) are beats
  float beat = std::stof(val);
  float time = beat * 60.0f / bpm;
  return std::to_string(time);
}

int main(int argc, char* argv[]) {
  if (argc < 2) {
    std::cerr << "Usage: " << argv[0]
              << " <input.seq> [output.cc] [--gantt=<file.txt>] "
                 "[--gantt-html=<file.html>] [--analyze]\n";
    std::cerr << "Examples:\n";
    std::cerr << "  " << argv[0]
              << " assets/demo.seq src/generated/timeline.cc\n";
    std::cerr << "  " << argv[0] << " assets/demo.seq --gantt=timeline.txt\n";
    std::cerr << "  " << argv[0]
              << " assets/demo.seq --gantt-html=timeline.html\n";
    std::cerr << "  " << argv[0] << " assets/demo.seq --analyze\n";
    std::cerr << "  " << argv[0]
              << " assets/demo.seq timeline.cc --gantt=timeline.txt "
                 "--gantt-html=timeline.html\n";
    std::cerr << "\nOptions:\n";
    std::cerr << "  --analyze         Analyze effect stacking depth and "
                 "identify bottlenecks\n";
    std::cerr << "\nIf output.cc is omitted, only validation and Gantt "
                 "generation are performed.\n";
    return 1;
  }

  std::string output_cc = "";
  std::string gantt_output = "";
  std::string gantt_html_output = "";
  bool analyze_depth = false;

  // Parse command line arguments
  for (int i = 2; i < argc; ++i) {
    std::string arg = argv[i];
    if (arg.rfind("--gantt=", 0) == 0) {
      gantt_output = arg.substr(8);
    } else if (arg.rfind("--gantt-html=", 0) == 0) {
      gantt_html_output = arg.substr(13);
    } else if (arg == "--analyze") {
      analyze_depth = true;
    } else if (output_cc.empty() && arg[0] != '-') {
      output_cc = arg;
    }
  }

  std::ifstream in_file(argv[1]);
  if (!in_file.is_open()) {
    std::cerr << "Error: Could not open input file " << argv[1] << "\n";
    return 1;
  }

  std::vector<SequenceEntry> sequences;
  SequenceEntry* current_seq = nullptr;
  float bpm = 120.0f;             // Default BPM
  std::string demo_end_time = ""; // Demo end time (optional)

  std::string line;
  int line_num = 0;
  while (std::getline(in_file, line)) {
    ++line_num;
    std::string trimmed = trim(line);
    if (trimmed.empty())
      continue;

    // Parse BPM from comment
    if (trimmed[0] == '#') {
      std::stringstream ss(trimmed);
      std::string hash, keyword;
      ss >> hash >> keyword;
      if (keyword == "BPM") {
        ss >> bpm;
        std::cout << "Using BPM: " << bpm << "\n";
      }
      continue;
    }

    std::stringstream ss(trimmed);
    std::string command;
    ss >> command;

    if (command == "SEQUENCE") {
      std::string start, priority;
      if (!(ss >> start >> priority)) {
        std::cerr << "Error line " << line_num
                  << ": SEQUENCE requires <start> <priority>\n";
        return 1;
      }
      // Convert beat notation to time
      std::string start_time = convert_to_time(start, bpm);

      // Check for optional "name" and [end_time]
      std::string end_time_str = "-1.0"; // Default: no explicit end
      std::string seq_name = "";         // Default: no name

      // Read remaining tokens
      std::string rest_of_line;
      std::getline(ss, rest_of_line);
      std::stringstream rest_ss(rest_of_line);
      std::string token;

      while (rest_ss >> token) {
        if (token.front() == '"') {
          // Name in quotes: read until closing quote
          std::string name_part = token.substr(1); // Remove opening quote
          if (name_part.back() == '"') {
            // Complete name in single token
            name_part.pop_back(); // Remove closing quote
            seq_name = name_part;
          } else {
            // Multi-word name: read until closing quote
            seq_name = name_part;
            while (rest_ss >> token) {
              if (token.back() == '"') {
                token.pop_back(); // Remove closing quote
                seq_name += " " + token;
                break;
              }
              seq_name += " " + token;
            }
          }
        } else if (token.front() == '[' && token.back() == ']') {
          // End time in brackets [time]
          std::string time_value = token.substr(1, token.size() - 2);
          end_time_str = convert_to_time(time_value, bpm);
        } else {
          std::cerr << "Error line " << line_num << ": Unexpected token '"
                    << token << "'. Expected \"name\" or [end_time]\n";
          return 1;
        }
      }

      sequences.push_back({start_time, priority, end_time_str, seq_name, {}});
      current_seq = &sequences.back();
    } else if (command == "EFFECT") {
      if (!current_seq) {
        std::cerr << "Error line " << line_num
                  << ": EFFECT found outside of SEQUENCE\n";
        return 1;
      }
      std::string priority_mod, class_name, start, end;
      if (!(ss >> priority_mod >> class_name >> start >> end)) {
        std::cerr << "Error line " << line_num
                  << ": EFFECT requires <+|=|-> <Class> <start> <end>\n";
        return 1;
      }

      // Validate priority modifier
      if (priority_mod != "+" && priority_mod != "=" && priority_mod != "-") {
        std::cerr << "Error line " << line_num
                  << ": Priority modifier must be '+', '=', or '-', got: "
                  << priority_mod << "\n";
        return 1;
      }

      // Calculate priority based on modifier and sequence state
      static int current_priority = 0;
      static bool first_in_sequence = true;
      static const SequenceEntry* last_seq = nullptr;

      // Reset priority tracking for new sequence
      if (current_seq != last_seq) {
        current_priority = 0;
        first_in_sequence = true;
        last_seq = current_seq;
      }

      // Handle first effect in sequence
      if (first_in_sequence) {
        if (priority_mod == "-") {
          current_priority = -1; // Background layer
        } else {
          current_priority = 0; // Default start (+ or =)
        }
        first_in_sequence = false;
      } else {
        // Update priority based on modifier for subsequent effects
        if (priority_mod == "+") {
          current_priority++;
        } else if (priority_mod == "-") {
          current_priority--;
        }
        // '=' keeps current_priority unchanged
      }

      std::string priority = std::to_string(current_priority);

      // Convert beat notation to time
      std::string start_time = convert_to_time(start, bpm);
      std::string end_time = convert_to_time(end, bpm);

      // Capture remaining args (but strip inline comments)
      std::string rest_of_line;
      std::getline(ss, rest_of_line); // Read rest of line
      // Strip inline comments (everything from '#' onwards)
      size_t comment_pos = rest_of_line.find('#');
      if (comment_pos != std::string::npos) {
        rest_of_line = rest_of_line.substr(0, comment_pos);
      }
      // Remove leading/trailing whitespace
      rest_of_line = trim(rest_of_line);

      // Parse parameters from rest of line
      std::vector<std::pair<std::string, std::string>> params;
      std::string extra_args = "";
      if (!rest_of_line.empty()) {
        params = parse_parameters(rest_of_line);
        // Keep extra_args for backward compatibility (if no key=value pairs
        // found)
        if (params.empty()) {
          extra_args = ", " + rest_of_line;
        }
      }

      current_seq->effects.push_back(
          {class_name, start_time, end_time, priority, extra_args, params});
    } else {
      std::cerr << "Error line " << line_num << ": Unknown command '" << command
                << "'\n";
      return 1;
    }
  }

  // Calculate demo end time from maximum effect end time
  float max_end_time = 0.0f;
  for (const auto& seq : sequences) {
    float seq_start = std::stof(seq.start_time);
    for (const auto& eff : seq.effects) {
      max_end_time = std::max(max_end_time, seq_start + std::stof(eff.end));
    }
  }
  demo_end_time = std::to_string(max_end_time);
  std::cout << "Demo end time (calculated): " << demo_end_time << "s\n";

  // Sort sequences by start time (primary) then priority (secondary)
  std::sort(sequences.begin(), sequences.end(),
            [](const SequenceEntry& a, const SequenceEntry& b) {
              float a_start = std::stof(a.start_time);
              float b_start = std::stof(b.start_time);
              if (a_start != b_start) return a_start < b_start;
              return std::stoi(a.priority) < std::stoi(b.priority);
            });

  // Sort effects within each sequence by priority
  for (auto& seq : sequences) {
    std::sort(seq.effects.begin(), seq.effects.end(),
              [](const EffectEntry& a, const EffectEntry& b) {
                return std::stoi(a.priority) < std::stoi(b.priority);
              });
  }

  // Validate: detect priority collisions among post-process effects
  for (size_t seq_idx = 0; seq_idx < sequences.size(); ++seq_idx) {
    const auto& seq = sequences[seq_idx];
    std::map<int, std::vector<std::string>> priority_map;

    // Group post-process effects by priority
    for (const auto& eff : seq.effects) {
      if (is_post_process_effect(eff.class_name)) {
        int prio = std::stoi(eff.priority);
        priority_map[prio].push_back(eff.class_name);
      }
    }

    // Check for collisions
    for (const auto& [prio, effects] : priority_map) {
      if (effects.size() > 1) {
        std::cerr << "Warning: Priority collision detected in sequence at time "
                  << seq.start_time << "s\n";
        std::cerr << "  Multiple post-process effects have priority " << prio
                  << ":\n";
        for (const auto& effect : effects) {
          std::cerr << "    - " << effect << "\n";
        }
        std::cerr << "  This may cause unexpected render order. Consider "
                     "adjusting priorities.\n";
      }
    }
  }

  // Validate: detect cross-sequence priority collisions for concurrent
  // sequences
  std::map<std::string, std::vector<size_t>> time_groups;
  for (size_t i = 0; i < sequences.size(); ++i) {
    time_groups[sequences[i].start_time].push_back(i);
  }

  for (const auto& [start_time, seq_indices] : time_groups) {
    if (seq_indices.size() > 1) {
      // Multiple sequences start at the same time
      std::map<int, std::vector<std::pair<std::string, size_t>>>
          cross_priority_map;

      for (size_t seq_idx : seq_indices) {
        const auto& seq = sequences[seq_idx];
        for (const auto& eff : seq.effects) {
          if (is_post_process_effect(eff.class_name)) {
            int prio = std::stoi(eff.priority);
            cross_priority_map[prio].push_back({eff.class_name, seq_idx});
          }
        }
      }

      // Check for cross-sequence collisions
      for (const auto& [prio, effects] : cross_priority_map) {
        if (effects.size() > 1) {
          std::cerr << "Warning: Cross-sequence priority collision at time "
                    << start_time << "s\n";
          std::cerr << "  Multiple post-process effects across sequences have "
                       "priority "
                    << prio << ":\n";
          for (const auto& [effect, seq_idx] : effects) {
            std::cerr << "    - " << effect << " (sequence #" << seq_idx
                      << ")\n";
          }
          std::cerr << "  Post-process effects from different sequences at the "
                       "same time will be\n";
          std::cerr
              << "  merged into a single render chain. Consider adjusting "
                 "priorities to clarify order.\n";
        }
      }
    }
  }

  // Generate C++ code if output file is specified
  if (!output_cc.empty()) {
    std::ofstream out_file(output_cc);
    if (!out_file.is_open()) {
      std::cerr << "Error: Could not open output file " << output_cc << "\n";
      return 1;
    }

    out_file << "// Auto-generated by seq_compiler. Do not edit.\n";
    out_file << "#include \"gpu/demo_effects.h\"\n";
    out_file << "#include \"gpu/effect.h\"\n\n";

    // Generate demo duration function
    if (!demo_end_time.empty()) {
      out_file << "float GetDemoDuration() {\n";
      out_file << "  return " << demo_end_time << "f;\n";
      out_file << "}\n\n";
    } else {
      out_file << "float GetDemoDuration() {\n";
      out_file << "  return -1.0f;  // No end time specified\n";
      out_file << "}\n\n";
    }

    out_file << "void LoadTimeline(MainSequence& main_seq, const GpuContext& "
                "ctx) {\n";

    for (const SequenceEntry& seq : sequences) {
      out_file << "  {\n";
      out_file << "    auto seq = std::make_shared<Sequence>();\n";
      // Set sequence end time if specified
      if (seq.end_time != "-1.0") {
        out_file << "    seq->set_end_time(" << seq.end_time << "f);\n";
      }
      for (const EffectEntry& eff : seq.effects) {
        // Check if effect has parameters
        if (!eff.params.empty() && eff.class_name == "FlashEffect") {
          // Generate parameter struct initialization for FlashEffect
          out_file << "    {\n";
          out_file << "      FlashEffectParams p;\n";

          for (const auto& [key, value] : eff.params) {
            if (key == "color") {
              // Parse color as r,g,b
              std::istringstream color_ss(value);
              std::string r, g, b;
              std::getline(color_ss, r, ',');
              std::getline(color_ss, g, ',');
              std::getline(color_ss, b, ',');
              out_file << "      p.color[0] = " << r << "f;\n";
              out_file << "      p.color[1] = " << g << "f;\n";
              out_file << "      p.color[2] = " << b << "f;\n";
            } else if (key == "decay") {
              out_file << "      p.decay_rate = " << value << "f;\n";
            } else if (key == "threshold") {
              out_file << "      p.trigger_threshold = " << value << "f;\n";
            }
          }

          out_file << "      seq->add_effect(std::make_shared<"
                   << eff.class_name << ">(ctx, p), " << eff.start << "f, "
                   << eff.end << "f, " << eff.priority << ");\n";
          out_file << "    }\n";
        } else if (!eff.params.empty() &&
                   eff.class_name == "ChromaAberrationEffect") {
          // Generate parameter struct initialization for ChromaAberrationEffect
          out_file << "    {\n";
          out_file << "      ChromaAberrationParams p;\n";

          for (const auto& [key, value] : eff.params) {
            if (key == "offset") {
              out_file << "      p.offset_scale = " << value << "f;\n";
            } else if (key == "angle") {
              out_file << "      p.angle = " << value << "f;\n";
            }
          }

          out_file << "      seq->add_effect(std::make_shared<"
                   << eff.class_name << ">(ctx, p), " << eff.start << "f, "
                   << eff.end << "f, " << eff.priority << ");\n";
          out_file << "    }\n";
        } else if (!eff.params.empty() &&
                   eff.class_name == "GaussianBlurEffect") {
          // Generate parameter struct initialization for GaussianBlurEffect
          out_file << "    {\n";
          out_file << "      GaussianBlurParams p;\n";

          for (const auto& [key, value] : eff.params) {
            if (key == "strength") {
              out_file << "      p.strength = " << value << "f;\n";
            }
          }

          out_file << "      seq->add_effect(std::make_shared<"
                   << eff.class_name << ">(ctx, p), " << eff.start << "f, "
                   << eff.end << "f, " << eff.priority << ");\n";
          out_file << "    }\n";
        } else if (!eff.params.empty() && eff.class_name == "VignetteEffect") {
          // Generate parameter struct initialization for VignetteEffect
          out_file << "    {\n";
          out_file << "      VignetteParams p;\n";

          for (const auto& [key, value] : eff.params) {
            if (key == "radius") {
              out_file << "      p.radius = " << value << "f;\n";
            } else if (key == "softness") {
              out_file << "      p.softness = " << value << "f;\n";
            }
          }

          out_file << "      seq->add_effect(std::make_shared<"
                   << eff.class_name << ">(ctx, p), " << eff.start << "f, "
                   << eff.end << "f, " << eff.priority << ");\n";
          out_file << "    }\n";
        } else if (!eff.params.empty() && eff.class_name == "CNNEffect") {
          // Generate parameter struct initialization for CNNEffect
          // If layers>1, expand into multiple chained effect instances
          int num_layers = 1;
          float blend_amount = 1.0f;

          for (const auto& [key, value] : eff.params) {
            if (key == "layers") {
              num_layers = std::stoi(value);
            } else if (key == "blend") {
              blend_amount = std::stof(value);
            }
          }

          // Generate one effect per layer
          for (int layer = 0; layer < num_layers; ++layer) {
            out_file << "    {\n";
            out_file << "      CNNEffectParams p;\n";
            out_file << "      p.layer_index = " << layer << ";\n";
            out_file << "      p.total_layers = " << num_layers << ";\n";
            // Only apply blend_amount on the last layer
            if (layer == num_layers - 1) {
              out_file << "      p.blend_amount = " << blend_amount << "f;\n";
            } else {
              out_file << "      p.blend_amount = 1.0f;\n";
            }
            out_file << "      seq->add_effect(std::make_shared<"
                     << eff.class_name << ">(ctx, p), " << eff.start << "f, "
                     << eff.end << "f, " << (std::stoi(eff.priority) + layer)
                     << ");\n";
            out_file << "    }\n";
          }
        } else if (!eff.params.empty() && eff.class_name == "CNNv2Effect") {
          // Generate parameter struct initialization for CNNv2Effect
          out_file << "    {\n";
          out_file << "      CNNv2EffectParams p;\n";

          for (const auto& [key, value] : eff.params) {
            if (key == "blend") {
              out_file << "      p.blend_amount = " << value << "f;\n";
            }
          }

          out_file << "      seq->add_effect(std::make_shared<"
                   << eff.class_name << ">(ctx, p), " << eff.start << "f, "
                   << eff.end << "f, " << eff.priority << ");\n";
          out_file << "    }\n";
        } else {
          // No parameters or unsupported effect - use default constructor
          out_file << "    seq->add_effect(std::make_shared<" << eff.class_name
                   << ">(ctx" << eff.extra_args << "), " << eff.start << "f, "
                   << eff.end << "f, " << eff.priority << ");\n";
        }
      }
      out_file << "    main_seq.add_sequence(seq, " << seq.start_time << "f, "
               << seq.priority << ");\n";
      out_file << "  }\n";
    }

    out_file << "}\n";
    out_file.close();

    std::cout << "Successfully generated timeline with " << sequences.size()
              << " sequences.\n";
  } else {
    std::cout << "Validation successful: " << sequences.size() << " sequences, "
              << (demo_end_time.empty() ? "no" : "explicit") << " end time.\n";
  }

  // Generate Gantt charts if requested
  if (!gantt_output.empty()) {
    generate_gantt_chart(gantt_output, sequences, bpm, demo_end_time);
  }
  if (!gantt_html_output.empty()) {
    generate_gantt_html(gantt_html_output, sequences, bpm, demo_end_time);
  }

  // Analyze effect stacking depth if requested
  if (analyze_depth) {
    analyze_effect_depth(sequences, demo_end_time);
  }

  return 0;
}