export type Box = { x: number; y: number; w: number; h: number };
export type Component = {
  id: string; revision: string; name: string; medium: string; note: string; box: Box;
  material?: { format: string; width: number; height: number; alpha: 'transparent' | 'opaque' | 'unknown' };
  context?: { kind?: 'image' | 'page'; sourceKind?: 'page'; url: string; layering: string };
  thumbnail?: { url: string; box?: Box };
  preview: { kind: 'image' | 'page'; sourceKind?: 'page'; url: string; position?: string };
};
export type ReviewPacket = {
  id: string; revision: string; title: string; round: number;
  comp: { url: string; width: number; height: number; background?: string }; components: Component[];
};
export type Decision = { revision: string; action: 'approve' | 'revise'; feedback: string; split: boolean };
export type Missing = { id: string; name: string; box: Box; feedback: string };
export type Draft = { packetRevision: string; decisions: Record<string, Decision>; missing: Missing[]; inventoryConfirmed: boolean };
export type ReviewHistory = {
  packet: ReviewPacket; draft: Draft; submitted: boolean;
  changes: Record<string, { kind: 'added' | 'changed' | 'unchanged'; files: string[]; reasons: string[]; carried?: boolean }>;
  feedback?: Record<string, { round: number; decision: Decision }>;
  removed: { id: string; name: string }[];
};
export function repairStatus(id: string, history?: ReviewHistory | null) {
  const change = history?.changes[id];
  const outstanding = history?.feedback?.[id];
  const prior = outstanding?.decision ?? (history?.submitted ? history.draft.decisions[id] : undefined);
  const carried = change?.kind === 'unchanged' && (change.carried ?? (history?.submitted && prior?.action === 'approve')) === true;
  return {
    change, prior, feedbackRound: outstanding?.round ?? history?.packet.round,
    carried,
    label: change?.kind === 'added' ? 'New component'
      : change?.kind === 'changed' ? 'Review again'
      : carried ? 'Approval kept'
      : prior?.action === 'revise' ? 'Changes still requested' : 'Awaiting review',
  };
}
export function componentState(component: Component, draft: Draft, history?: ReviewHistory | null) {
  const saved = draft.decisions[component.id];
  const decision = saved?.revision === component.revision ? saved : undefined;
  const repair = repairStatus(component.id, history);
  if (decision?.action === 'approve') return { kind: 'approved' as const, label: repair.carried ? 'Approval kept' : 'Approved', priority: 3 };
  if (decision?.action === 'revise') return { kind: 'feedback' as const, label: 'Feedback ready', priority: 2 };
  return { kind: 'pending' as const, label: repair.change?.kind === 'changed' ? 'Review again' : repair.change?.kind === 'added' ? 'New · review needed' : 'Not reviewed', priority: repair.change?.kind === 'changed' || repair.change?.kind === 'added' ? 0 : 1 };
}
export function newDraft(packet: ReviewPacket): Draft {
  return { packetRevision: packet.revision, decisions: {}, missing: [], inventoryConfirmed: false };
}
export function validBox(b: Box) {
  return Object.values(b).every(Number.isFinite) && b.x >= 0 && b.y >= 0 && b.w > 0 && b.h > 0 && b.x + b.w <= 1.00001 && b.y + b.h <= 1.00001;
}
export function summarize(packet: ReviewPacket, draft: Draft) {
  const decisions = packet.components.map(c => draft.decisions[c.id]?.revision === c.revision ? draft.decisions[c.id] : undefined);
  const approved = decisions.filter(d => d?.action === 'approve').length;
  const revisions = decisions.filter(d => d?.action === 'revise').length;
  const pending = decisions.length - approved - revisions;
  const hasFeedback = revisions > 0 || draft.missing.length > 0;
  return { approved, revisions, pending, hasFeedback,
    canSubmit: draft.packetRevision === packet.revision && draft.missing.every(m => m.name.trim() && validBox(m.box)) && (hasFeedback || (!pending && draft.inventoryConfirmed)) };
}
export function approveRemaining(packet: ReviewPacket, draft: Draft): Draft {
  const decisions = { ...draft.decisions };
  for (const c of packet.components) {
    if (!decisions[c.id] || decisions[c.id].revision !== c.revision) decisions[c.id] = { revision: c.revision, action: 'approve', feedback: '', split: false };
  }
  return { ...draft, decisions };
}
/** UI drafts are not authority. A trusted adapter must verify versions and actor before persisting. */
export function submission(packet: ReviewPacket, draft: Draft) {
  if (!summarize(packet, draft).canSubmit) throw new Error('Review is incomplete or stale');
  return { schemaVersion: 1, requestId: packet.id, ...structuredClone(draft) };
}

/** A code capture is an image for display, but is still a code implementation. */
export function componentPresentation(component: Component) {
  const code = component.preview.kind === 'page' || component.preview.sourceKind === 'page';
  const captured = component.preview.sourceKind === 'page';
  return {
    code, captured,
    label: code ? (component.medium.match(/html|css|svg/i) ? component.medium : 'HTML / CSS / SVG') : 'Raster',
    caption: code ? (captured ? 'Rendered component' : 'Live component') : 'Produced asset',
    fileLabel: captured ? 'Open captured preview' : 'Open source image',
  };
}