import type { CutsceneFile, Cutscene, ImageSegment, SubtitleLine } from '../types/cutscene';

function parseSegment(raw: Record<string, unknown>): ImageSegment {
  const from = (raw.from as Record<string, number> | undefined) ?? {};
  const to = (raw.to as Record<string, number> | undefined) ?? {};
  return {
    path: String(raw.path ?? ''),
    width: Number(raw.width ?? 1280),
    height: Number(raw.height ?? 720),
    startMs: Number(raw.startMs ?? 0),
    endMs: Number(raw.endMs ?? 5000),
    fadeInMs: Number(raw.fadeInMs ?? 0),
    fadeOutMs: Number(raw.fadeOutMs ?? 0),
    easing: String(raw.easing ?? 'Linear') as ImageSegment['easing'],
    from: {
      centerX: Number(from.centerX ?? 0.5),
      centerY: Number(from.centerY ?? 0.5),
      scale: Number(from.scale ?? 1.0),
    },
    to: {
      centerX: Number(to.centerX ?? from.centerX ?? 0.5),
      centerY: Number(to.centerY ?? from.centerY ?? 0.5),
      scale: Number(to.scale ?? from.scale ?? 1.0),
    },
  };
}

function parseLine(raw: Record<string, unknown>): SubtitleLine {
  return {
    speaker: String(raw.speaker ?? ''),
    text: String(raw.text ?? ''),
    durationMs: Number(raw.durationMs ?? 0),
    waitForConfirm: Boolean(raw.waitForConfirm ?? false),
    luaCallback: String(raw.luaCallback ?? ''),
  };
}

function parseCutscene(raw: Record<string, unknown>): Cutscene {
  const segments = Array.isArray(raw.imageSegments)
    ? (raw.imageSegments as Record<string, unknown>[]).map(parseSegment)
    : [];
  const lines = Array.isArray(raw.lines)
    ? (raw.lines as Record<string, unknown>[]).map(parseLine)
    : [];
  return {
    id: String(raw.id ?? 'untitled'),
    skippable: raw.skippable !== false,
    durationMs: Number(raw.durationMs ?? 0),
    fadeOutMs: Number(raw.fadeOutMs ?? 0),
    fadeInMs: Number(raw.fadeInMs ?? 0),
    endFadeOutMs: Number(raw.endFadeOutMs ?? 0),
    endFadeInMs: Number(raw.endFadeInMs ?? 0),
    onFadeInCallback: String(raw.onFadeInCallback ?? ''),
    imageSegments: segments,
    lines,
  };
}

export function parseFile(json: unknown): CutsceneFile {
  const raw = json as Record<string, unknown>;
  const cutscenes = Array.isArray(raw.cutscenes)
    ? (raw.cutscenes as Record<string, unknown>[]).map(parseCutscene)
    : [];
  return { cutscenes };
}

export function triggerDownload(file: CutsceneFile, filename = 'cutscenes.json') {
  const json = JSON.stringify(file, null, 4);
  const blob = new Blob([json], { type: 'application/json' });
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url;
  a.download = filename;
  a.click();
  URL.revokeObjectURL(url);
}