// 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 (DISABLED 410) | call2
//   settings.py     GET/PUT            /api/v1/settings ; POST /api/v1/settings/test-woo|test-inference
//   Woo-backed calls attach X-Woo-Username / X-Woo-App-Password from localStorage (required on those routes).
//   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).

import { withWooHeaders } from './wooDeviceCreds';

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;
  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;
  /** Create-time optimistic token; updates compare against server_rev, not this. */
  client_rev: number;
  /** Optimistic concurrency token; send as client_rev on PUT. */
  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));
}

function putSlab(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));
}

/**
 * PUT a slab patch. `client_rev` must equal the slab's current `server_rev`.
 * On 409 revision_conflict (stale rev — e.g. review POST bumped server_rev, or
 * a concurrent save), refetch once, adopt the latest server_rev, and retry.
 * A second 409 surfaces a clear reload message.
 */
export async function updateSlab(
  id: string,
  patch: SlabInput & { client_rev: number },
): Promise<Slab> {
  try {
    return await putSlab(id, patch);
  } catch (e) {
    if (!(e instanceof ApiError) || e.status !== 409) throw e;
    const latest = await getSlab(id);
    try {
      return await putSlab(id, { ...patch, client_rev: latest.server_rev });
    } catch (e2) {
      if (e2 instanceof ApiError && e2.status === 409) {
        throw new ApiError(
          409,
          e2.code ?? 'revision_conflict',
          'This slab changed elsewhere. Reload the page and try again.',
          e2.detail,
        );
      }
      throw e2;
    }
  }
}

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;
  /** #90: lineup kind (clean cal / dimension-overlay copy / batch). */
  role: 'calibration' | 'overlay' | 'batch';
  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;
  /** #90: lineup kind; defaults to batch. */
  role?: 'calibration' | 'overlay' | 'batch';
  original: Blob;
  processed?: Blob | null;
}

export interface UploadPhotoResult {
  id: string;
  slab_id: string;
  seq: number;
  is_calibration: number;
  role: 'calibration' | 'overlay' | 'batch';
  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');
  form.append('role', input.role ?? 'batch');
  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));
}

// #90: drop a photo the owner removed in Review (keep/remove edit).
export function deletePhoto(slabId: string, photoId: string): Promise<void> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/photos/${encodeURIComponent(photoId)}`, {
    method: 'DELETE',
  }).then((r) => parse<void>(r));
}

/**
 * #90: persist an edited Review photo lineup. `kept` is the owner's final
 * order (leftmost = primary); each entry re-uploads with a fresh seq so the
 * stored `seq` reflects the keep order. `removed` photos are dropped. Every
 * kept photo's blob is re-sent (original + processed) because the server
 * stores only the BLOB — there is no separate re-seq endpoint.
 */
export interface LineupPhoto {
  id: string;
  role: 'calibration' | 'overlay' | 'batch';
  isCalibration: boolean;
  original: Blob;
  processed: Blob | null;
}

export async function persistLineup(
  slabId: string,
  kept: LineupPhoto[],
  removed: string[],
): Promise<void> {
  for (const id of removed) {
    await deletePhoto(slabId, id);
  }
  for (let i = 0; i < kept.length; i++) {
    const p = kept[i];
    await uploadPhoto(slabId, {
      photoId: p.id,
      seq: i + 1,
      isCalibration: p.isCalibration,
      role: p.role,
      original: p.original,
      processed: p.processed,
    });
  }
}

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;
  /** True when deterministic title/short_desc were built from taxonomy. */
  title_built?: boolean;
  title_build_missing?: string[];
}

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;
}

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));
}

// ---------------------------------------------------------------------------
// 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',
    headers: withWooHeaders(),
  }).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;
  /** Present when Call 2 returned a parsed short_description. */
  short_description?: string;
}

/** Call 1 OUT (overnight-whole-app): always fails with 410 call1_disabled. Prefer manual taxonomy. */
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));
}

/** View prompt: assembled Call 2 text + photo slots (no base64, no model call). */
export interface Call2PromptPhoto {
  seq: number;
  id: string;
  bytes: number;
  long_edge_px: number | null;
}

export interface Call2Prompt {
  text: string;
  photos: Call2PromptPhoto[];
  prompt_revision_id: number | null;
}

export function getCall2Prompt(slabId: string): Promise<Call2Prompt> {
  return fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/inference/call2/prompt`).then((r) =>
    parse<Call2Prompt>(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',
    headers: withWooHeaders(),
  }).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',
    headers: withWooHeaders(),
  }).then((r) => parse<TestWooResult>(r));
}

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