/**
 * /recipes — API recipe CRUD
 *
 * recipe 是「http_request + 參數模板」的具名封裝。
 * 不需要 deploy Worker，執行時由 cypher-executor 直接 fetch。
 *
 * KV 結構：
 *   recipe:{canonical_id}  → RecipeDefinition JSON
 *   idx:{rec_hash}         → canonical_id  （反查索引）
 *
 * 引用方式（workflow config）：
 *   component: "rec_f7e2a1b3"  → 永久穩定，不受改名影響
 *   component: "slack"         → 向前兼容，直接用 canonical_id 查
 */

import { Hono } from 'hono';
import type { Bindings } from '../types';
import { deriveRecipeHash } from '../lib/hash';
import { checkExposureConsent, resolveConsentForRecord } from '../lib/exposure-consent';
import type { ExposureConsent } from '../lib/exposure-consent';

export const recipesRouter = new Hono<{ Bindings: Bindings }>();

export interface RecipeDefinition {
  canonical_id: string;
  hash_id: string;          // rec_xxxxxxxx
  display_name?: string;
  description?: string;
  endpoint: string;
  method?: string;          // GET | POST | PUT | PATCH | DELETE，預設 POST
  headers?: Record<string, string>;
  body?: Record<string, unknown>;
  /**
   * 此 recipe 要用哪個 auth recipe（auth_recipe:{auth_service}）。
   * 讓多個 recipe 共用同一把 auth（例：kbdb_get / kbdb_create_block 都設 "kbdb"）。
   * 未設時 auth-dispatcher fallback 到把 canonical_id 當 service name（向後相容）。
   */
  auth_service?: string;
  credentials_required?: Array<{
    key: string;
    inject_as: string;
  }>;
  // 資料外流警示：recipe 定義一個資料去向（endpoint）。push 需人類明示同意（法律憑證）。
  // SDD: data-exfil-warning §7（公私一視同仁）
  exposure_consent?: ExposureConsent;
  created_at: number;
  updated_at: number;
}

// POST /recipes — 新增或更新 recipe
recipesRouter.post('/recipes', async (c) => {
  let body: Partial<RecipeDefinition>;
  try {
    body = await c.req.json();
  } catch {
    return c.json({ success: false, error: 'request body 必須為 JSON' }, 400);
  }

  const canonicalId = (body.canonical_id ?? '').trim().toLowerCase();
  if (!canonicalId) return c.json({ success: false, error: 'canonical_id 必填' }, 400);
  if (!body.endpoint) return c.json({ success: false, error: 'endpoint 必填' }, 400);

  const hashId = await deriveRecipeHash(canonicalId);
  const now = Date.now();

  // 讀取現有版本（保留 created_at + 既有同意憑證）
  const existing = await c.env.RECIPES.get(`recipe:${canonicalId}`, 'json') as RecipeDefinition | null;

  // 資料外流警示：recipe 定義資料去向（endpoint）。首次 push 需人類明示同意（公私一視同仁）。
  const consentError = checkExposureConsent(body.exposure_consent, existing?.exposure_consent);
  if (consentError !== null) {
    return c.json({ success: false, error: consentError, requires: 'exposure_consent' }, 403);
  }

  const recipe: RecipeDefinition = {
    canonical_id: canonicalId,
    hash_id: hashId,
    display_name: body.display_name,
    description: body.description,
    endpoint: body.endpoint,
    method: (body.method ?? 'POST').toUpperCase(),
    headers: body.headers,
    body: body.body,
    auth_service: body.auth_service,
    credentials_required: body.credentials_required,
    exposure_consent: resolveConsentForRecord(body.exposure_consent, existing?.exposure_consent),
    created_at: existing?.created_at ?? now,
    updated_at: now,
  };

  // 寫入兩個 KV key
  await Promise.all([
    c.env.RECIPES.put(`recipe:${canonicalId}`, JSON.stringify(recipe)),
    c.env.RECIPES.put(`idx:${hashId}`, canonicalId),
  ]);

  return c.json({ success: true, recipe });
});

// GET /recipes/:id — 讀取 recipe（支援 canonical_id 或 rec_hash）
recipesRouter.get('/recipes/:id', async (c) => {
  const id = c.req.param('id');
  const recipe = await resolveRecipe(id, c.env.RECIPES);
  if (!recipe) return c.json({ success: false, error: `找不到 recipe: ${id}` }, 404);
  return c.json({ success: true, recipe });
});

// GET /recipes — 列出所有 recipe
recipesRouter.get('/recipes', async (c) => {
  const list = await c.env.RECIPES.list({ prefix: 'recipe:' });
  const recipes = await Promise.all(
    list.keys.map(k => c.env.RECIPES.get(k.name, 'json'))
  );
  return c.json({ success: true, recipes: recipes.filter(Boolean), count: recipes.length });
});

// DELETE /recipes/:id — 刪除 recipe
recipesRouter.delete('/recipes/:id', async (c) => {
  const id = c.req.param('id');
  const recipe = await resolveRecipe(id, c.env.RECIPES);
  if (!recipe) return c.json({ success: false, error: `找不到 recipe: ${id}` }, 404);

  await Promise.all([
    c.env.RECIPES.delete(`recipe:${recipe.canonical_id}`),
    c.env.RECIPES.delete(`idx:${recipe.hash_id}`),
  ]);

  return c.json({ success: true, deleted: recipe.canonical_id });
});

/** 用 canonical_id 或 rec_hash 查 recipe */
export async function resolveRecipe(
  id: string,
  kv: KVNamespace,
): Promise<RecipeDefinition | null> {
  // rec_xxxxxxxx → 先查 idx 反查 canonical_id
  if (id.startsWith('rec_')) {
    const canonicalId = await kv.get(`idx:${id}`);
    if (!canonicalId) return null;
    return kv.get(`recipe:${canonicalId}`, 'json');
  }
  // 直接用 canonical_id
  return kv.get(`recipe:${id}`, 'json');
}

// ── Auth Recipe ────────────────────────────────────────────────────────────────

export type AuthPrimitive = 'static_key' | 'oauth2' | 'service_account' | 'mtls';

export interface SecretRequirement {
  key: string;          // CREDENTIALS_KV 的名稱（e.g. "notion_token"）
  label: string;        // CLI/UI 顯示（e.g. "Internal Integration Token"）
  type?: 'string' | 'json_blob';  // default: string
  help?: string;
  help_url?: string;
  optional?: boolean;
}

export interface AuthInjectSpec {
  header?: Record<string, string>;  // e.g. { Authorization: "Bearer {{secret.token}}" }
  query?: Record<string, string>;
  body?: Record<string, string>;
}

export interface AuthRecipeDefinition {
  kind: 'auth_recipe';
  service: string;              // canonical_id，e.g. "notion"
  version: number;
  primitive: AuthPrimitive;
  base_url: string;
  display_name?: string;
  description?: string;

  // service_account 專用
  service_account_kind?: 'google_jwt';
  token_exchange?: {
    endpoint: string;
    scopes: string[];
  };

  required_secrets: SecretRequirement[];
  inject: AuthInjectSpec;

  created_at: number;
  updated_at: number;
}

/** 查 auth recipe（KV key: auth_recipe:{service}）*/
export async function resolveAuthRecipe(
  service: string,
  kv: KVNamespace,
): Promise<AuthRecipeDefinition | null> {
  return kv.get(`auth_recipe:${service}`, 'json');
}

// POST /auth-recipes — 新增或更新 auth recipe
recipesRouter.post('/auth-recipes', async (c) => {
  let body: Partial<AuthRecipeDefinition>;
  try {
    body = await c.req.json();
  } catch {
    return c.json({ success: false, error: 'request body 必須為 JSON' }, 400);
  }

  const service = (body.service ?? '').trim().toLowerCase();
  if (!service) return c.json({ success: false, error: 'service 必填' }, 400);
  if (!body.primitive) return c.json({ success: false, error: 'primitive 必填' }, 400);
  if (!body.base_url) return c.json({ success: false, error: 'base_url 必填' }, 400);
  if (!body.required_secrets?.length) return c.json({ success: false, error: 'required_secrets 必填' }, 400);
  if (!body.inject) return c.json({ success: false, error: 'inject 必填' }, 400);

  const now = Date.now();
  const existing = await c.env.RECIPES.get(`auth_recipe:${service}`, 'json') as AuthRecipeDefinition | null;

  const recipe: AuthRecipeDefinition = {
    kind: 'auth_recipe',
    service,
    version: body.version ?? 1,
    primitive: body.primitive,
    base_url: body.base_url,
    display_name: body.display_name,
    description: body.description,
    service_account_kind: body.service_account_kind,
    token_exchange: body.token_exchange,
    required_secrets: body.required_secrets,
    inject: body.inject,
    created_at: existing?.created_at ?? now,
    updated_at: now,
  };

  await c.env.RECIPES.put(`auth_recipe:${service}`, JSON.stringify(recipe));
  return c.json({ success: true, recipe });
});

// GET /auth-recipes — 列出所有 auth recipe
recipesRouter.get('/auth-recipes', async (c) => {
  const list = await c.env.RECIPES.list({ prefix: 'auth_recipe:' });
  const recipes = await Promise.all(
    list.keys.map(k => c.env.RECIPES.get(k.name, 'json'))
  );
  return c.json({ success: true, recipes: recipes.filter(Boolean), count: recipes.length });
});

// GET /auth-recipes/:service — 讀取單一 auth recipe
recipesRouter.get('/auth-recipes/:service', async (c) => {
  const service = c.req.param('service');
  const recipe = await resolveAuthRecipe(service, c.env.RECIPES);
  if (!recipe) return c.json({ success: false, error: `找不到 auth recipe: ${service}` }, 404);
  return c.json({ success: true, recipe });
});

// DELETE /auth-recipes/:service — 刪除 auth recipe
recipesRouter.delete('/auth-recipes/:service', async (c) => {
  const service = c.req.param('service');
  const recipe = await resolveAuthRecipe(service, c.env.RECIPES);
  if (!recipe) return c.json({ success: false, error: `找不到 auth recipe: ${service}` }, 404);
  await c.env.RECIPES.delete(`auth_recipe:${service}`);
  return c.json({ success: true, deleted: service });
});