// Thin client for the SlabUploader app API. Svelte-agnostic.
//
// Mirrors the LIVE backend routes (backend/*.py), which are the source of truth:
//   slabs.py        POST/GET/PUT/DELETE /api/v1/slabs[/{id}]
//   photos.py       POST/GET           /api/v1/slabs/{id}/photos[.../original|processed]
//   review.py       POST               /api/v1/slabs/{id}/review
//   publish.py      POST               /api/v1/slabs/{id}/publish
//   inference.py    POST               /api/v1/slabs/{id}/inference/call1|call2
//   settings.py     GET/PUT            /api/v1/settings ; POST /api/v1/settings/test-woo|test-inference
//   taxonomy.py     GET/POST           /api/v1/admin/taxonomy[.../sync]
//   pricing.py      CRUD               /api/v1/admin/pricing[/{id}]
//
// Every non-2xx is surfaced as an ApiError carrying the backend `code` and a plain
// owner-facing `message` (QUALITY-120: raw codes/stack traces never reach the owner).

export interface Slab {
  id: string;
  sku: string;
  status: string;
  price: number | null;
  price_source: string | null;
  length_in: number;
  thickness_in: number;
  sqft: number;
  bdft: number;
  width_min_in: number;
  width_max_in: number;
  width_avg_in: number;
  species_id: number | null;
  wood_category_ids: number[];
  edge_type_term_id: number | null;
  figure_term_ids: number[];
  grade_term_id: number | null;
  thickness_term_id: number | null;
  moisture_term_id: number | null;
  fig_tag_ids: number[];
  feat_tag_ids: number[];
  title: string | null;
  short_description: string | null;
  description: string | null;
  content_source: string | null;
  // #89: set true once the owner has locked the taxonomy (deterministic copy built).
  metadata_locked: boolean;
  species_confidence: number | null;
  figure_confidence: number | null;
  grade_confidence: number | null;
  inference_status: string | null;
  calibration_photo_id: string | null;
  woo_product_id: number | null;
  server_rev: number;
  created_at: string;
  updated_at: string;
}

// Fields a client may send on create/update (subset of the row).
export type SlabInput = Partial<
  Omit<
    Slab,
    | 'id'
    | 'status'
    | 'woo_product_id'
    | 'server_rev'
    | 'created_at'
    | 'updated_at'
    | 'inference_status'
    | 'species_confidence'
    | 'figure_confidence'
    | 'grade_confidence'
    | 'calibration_photo_id'
  >
>;

export interface SlabCreateInput extends SlabInput {
  id: string; // client-generated UUIDv4 (APP-20)
  client_rev: number; // 0 on create (APP-20)
}

export interface ApiErrorBody {
  code: string | null;
  message: string;
  detail?: Record<string, unknown> | null;
}

export class ApiError extends Error {
  constructor(
    public status: number,
    public code: string | null,
    message: string,
    public detail?: Record<string, unknown> | null,
  ) {
    super(message);
    this.name = 'ApiError';
  }
}

async function parse<T>(res: Response): Promise<T> {
  if (res.status === 204) return undefined as T;
  let body: unknown = null;
  try {
    body = await res.json();
  } catch {
    /* non-JSON body (e.g. 410 Gone) */
  }
  if (!res.ok) {
    const e = (body as { error?: ApiErrorBody } | null)?.error;
    throw new ApiError(
      res.status,
      e?.code ?? null,
      e?.message ?? res.statusText,
      e?.detail ?? null,
    );
  }
  return body as T;
}

function jsonBody(v: unknown): BodyInit {
  return JSON.stringify(v);
}

// ---------------------------------------------------------------------------
// Slabs
// ---------------------------------------------------------------------------

export function createSlab(input: SlabCreateInput): Promise<Slab> {
  return fetch('/api/v1/slabs', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: jsonBody(input),
  }).then((r) => parse<Slab>(r));
}

export function listSlabs(): Promise<Slab[]> {
  return fetch('/api/v1/slabs').then((r) => parse<Slab[]>(r));
}

export function getSlab(id: string): Promise<Slab> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(id)}`).then((r) => parse<Slab>(r));
}

export function updateSlab(id: string, patch: SlabInput & { client_rev: number }): Promise<Slab> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(id)}`, {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: jsonBody(patch),
  }).then((r) => parse<Slab>(r));
}

export function deleteSlab(id: string): Promise<void> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(id)}`, { method: 'DELETE' }).then((r) =>
    parse<void>(r),
  );
}

// ---------------------------------------------------------------------------
// Photos (lineup order = seq; calibration is is_calibration=1)
// ---------------------------------------------------------------------------

export interface PhotoRow {
  id: string;
  seq: number;
  is_calibration: number;
  width_px: number | null;
  height_px: number | null;
  has_original: number;
  has_processed: number;
}

export interface UploadPhotoInput {
  photoId: string; // client-generated UUIDv4
  seq?: number;
  isCalibration: boolean;
  original: Blob;
  processed?: Blob | null;
}

export interface UploadPhotoResult {
  id: string;
  slab_id: string;
  seq: number;
  is_calibration: number;
  original_retained: boolean;
  processed_retained: boolean;
}

export function listPhotos(slabId: string): Promise<PhotoRow[]> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/photos`).then((r) =>
    parse<PhotoRow[]>(r),
  );
}

export function uploadPhoto(slabId: string, input: UploadPhotoInput): Promise<UploadPhotoResult> {
  const form = new FormData();
  form.append('photo_id', input.photoId);
  if (input.seq != null) form.append('seq', String(input.seq));
  form.append('is_calibration', input.isCalibration ? '1' : '0');
  const origName = input.original instanceof File ? input.original.name : 'original.png';
  form.append('original', input.original, origName);
  if (input.processed) form.append('processed', input.processed, 'processed.png');
  return fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/photos`, {
    method: 'POST',
    body: form,
  }).then((r) => parse<UploadPhotoResult>(r));
}

export function photoUrl(
  slabId: string,
  photoId: string,
  kind: 'original' | 'processed',
): string {
  return `/api/v1/slabs/${encodeURIComponent(slabId)}/photos/${encodeURIComponent(photoId)}/${kind}`;
}

// ---------------------------------------------------------------------------
// Review (REVIEW-*)
// ---------------------------------------------------------------------------

export interface ReviewResult {
  ready: boolean;
  missing: string[];
  title: string | null;
  short_description: string | null;
  price: number | null;
  price_suggestion: number | null;
  primary_wood_category_id: number | null;
  // #89: whether the metadata is locked (deterministic copy built/persisted).
  locked: boolean;
}

export interface ReviewInput {
  primary_wood_category_id?: number;
  price?: number;
  sku?: string;
  title?: string;
  short_description?: string;
  description?: string;
  price_source?: string;
  content_source?: string;
  // #89: 'lock' triggers the explicit metadata-lock + deterministic copy build.
  action?: 'lock';
}

export function reviewSlab(slabId: string, payload: ReviewInput = {}): Promise<ReviewResult> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/review`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: jsonBody(payload),
  }).then((r) => parse<ReviewResult>(r));
}

// #89: explicit lock of the confirmed taxonomy. The server builds and persists
// the deterministic title/short_description from the locked set (owner prose
// already on the slab wins). Distinct from reviewSlab() which only reports.
export function lockSlab(slabId: string, payload: ReviewInput = {}): Promise<ReviewResult> {
  return reviewSlab(slabId, { ...payload, action: 'lock' });
}

// ---------------------------------------------------------------------------
// Publish (PUBLISH-*)
// ---------------------------------------------------------------------------

export interface PublishResult {
  ok: true;
  status: string;
  woo_product_id: number;
  draft: boolean;
}

export function publishSlab(slabId: string): Promise<PublishResult> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/publish`, {
    method: 'POST',
  }).then((r) => parse<PublishResult>(r));
}

// ---------------------------------------------------------------------------
// Inference (METADATA-*)
// ---------------------------------------------------------------------------

export interface Call1Suggestions {
  species_id?: number | null;
  species_confidence?: number | null;
  wood_category_ids?: number[];
  edge_type_term_id?: number | null;
  figure_term_ids?: number[];
  figure_confidence?: number | null;
  feature_tag_ids?: number[];
  feature_tag_confidence?: number | null;
}

export interface Call1Result {
  ok: boolean;
  suggestions: Call1Suggestions;
}

export interface Call2Result {
  ok: boolean;
  description: string;
}

export function inferTaxon(slabId: string): Promise<Call1Result> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/inference/call1`, {
    method: 'POST',
  }).then((r) => parse<Call1Result>(r));
}

export function inferContent(slabId: string): Promise<Call2Result> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/inference/call2`, {
    method: 'POST',
  }).then((r) => parse<Call2Result>(r));
}

// ---------------------------------------------------------------------------
// Taxonomy (METADATA-5/15/30; only legal picker options)
// ---------------------------------------------------------------------------

export interface TaxCategory {
  id: number;
  name: string;
  slug: string;
  parent_id: number | null;
  woo_id: number | null;
}

export interface TaxTerm {
  id: number;
  name: string;
  slug: string;
}

export interface TaxAttribute {
  id: number;
  name: string;
  slug: string;
  terms: TaxTerm[];
}

export interface TaxTag {
  id: number;
  name: string;
  slug: string;
}

export interface Taxonomy {
  categories: TaxCategory[];
  attributes: TaxAttribute[];
  tags: TaxTag[];
  taxonomy_anchor: string | null;
  taxonomy_last_sync_at: string | null;
}

export function getTaxonomy(): Promise<Taxonomy> {
  return fetch('/api/v1/admin/taxonomy').then((r) => parse<Taxonomy>(r));
}

export function syncTaxonomy(): Promise<{
  taxonomy_anchor: string;
  taxonomy_last_sync_at: string;
}> {
  return fetch('/api/v1/admin/taxonomy/sync', { method: 'POST' }).then((r) => parse(r));
}

// ---------------------------------------------------------------------------
// Pricing (SETTINGS-35)
// ---------------------------------------------------------------------------

export interface PriceRule {
  id: number;
  species_id: number;
  price_per_bdft: number;
  created_at: string;
  updated_at: string;
}

export function listPricing(): Promise<PriceRule[]> {
  return fetch('/api/v1/admin/pricing').then((r) => parse<PriceRule[]>(r));
}

export function createPricingRule(rule: {
  species_id: number;
  price_per_bdft: number;
}): Promise<PriceRule> {
  return fetch('/api/v1/admin/pricing', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: jsonBody(rule),
  }).then((r) => parse<PriceRule>(r));
}

export function updatePricingRule(
  id: number,
  patch: { price_per_bdft: number; species_id?: number },
): Promise<PriceRule> {
  return fetch(`/api/v1/admin/pricing/${id}`, {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: jsonBody(patch),
  }).then((r) => parse<PriceRule>(r));
}

export function deletePricingRule(id: number): Promise<void> {
  return fetch(`/api/v1/admin/pricing/${id}`, { method: 'DELETE' }).then((r) => parse<void>(r));
}

// ---------------------------------------------------------------------------
// Settings (SETTINGS-*)
// ---------------------------------------------------------------------------

export interface SettingsView {
  woo_base_url: string;
  woo_wp_username: string | null;
  woo_app_password: { configured: boolean } | string;
  inference_base_url: { configured: boolean } | string;
  inference_api_key: { configured: boolean } | string;
  inference_model: string | null;
  inference_enabled: boolean;
  content_llm_enabled: boolean;
  brand_voice: string | null;
  geo_context: string | null;
  woo_create_status: string;
  taxonomy_last_sync_at: string | null;
  taxonomy_anchor: string | null;
}

export function getSettings(): Promise<SettingsView> {
  return fetch('/api/v1/settings').then((r) => parse<SettingsView>(r));
}

export function updateSettings(
  patch: Partial<Record<keyof SettingsView, unknown>>,
): Promise<SettingsView> {
  return fetch('/api/v1/settings', {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: jsonBody(patch),
  }).then((r) => parse<SettingsView>(r));
}

export interface TestWooResult {
  ok: boolean;
  detail: string;
  taxonomy_anchor: string | null;
  taxonomy_last_sync_at: string | null;
}

export interface TestInferenceResult {
  ok: boolean;
  mode: 'stateful' | 'stateless' | 'fail';
  vision_capable: boolean;
  detail: string;
}

export function testWoo(): Promise<TestWooResult> {
  return fetch('/api/v1/settings/test-woo', { method: 'POST' }).then((r) =>
    parse<TestWooResult>(r),
  );
}

export function testInference(): Promise<TestInferenceResult> {
  return fetch('/api/v1/settings/test-inference', { method: 'POST' }).then((r) =>
    parse<TestInferenceResult>(r),
  );
}