import { Hono } from 'hono';
import pool from '../../db/mysql.js';
import { ensureFeedbackTable } from '../../db/schema/feedback.js';
import type { AuthUser } from '../../auth/types.js';
import { canManageFeedback } from '../../auth/types.js';
import { uploadFeedbackImage } from './oss.js';
import {
  insertFeedback,
  listFeedbackForAdmin,
  listFeedbackForUser,
  updateFeedback,
  type Database,
} from './repository.js';

const MAX_IMAGE_SIZE = 5 * 1024 * 1024; // 5 MB
const ALLOWED_MIME = new Set(['image/png', 'image/jpeg', 'image/webp', 'image/gif']);

const VALID_STATUS = new Set(['open', 'in_progress', 'done', 'rejected']);

const VALID_TYPES = new Set(['dimension', 'bug', 'ux', 'other']);

export interface FeedbackDependencies {
  db: Database;
  /** 建表（只读模式下由 schema 层自行跳过）。测试注入空实现。 */
  ensureTable: () => Promise<void>;
  /** 截图上传实现，测试可注入。 */
  uploadImage?: typeof uploadFeedbackImage;
}

function currentUser(c: { get?: (k: string) => unknown }): AuthUser | undefined {
  return c.get?.('user') as AuthUser | undefined;
}

export function registerFeedbackRoutes(app: Hono, deps: FeedbackDependencies): void {
  const { db, ensureTable } = deps;
  const uploadImage = deps.uploadImage ?? uploadFeedbackImage;

  // POST /api/feedback/submit — 提交反馈
  app.post('/submit', async (c) => {
    await ensureTable();
    const body = await c.req.json().catch(() => ({})) as {
      type?: string; module?: string | null; content?: string;
      contact?: string | null; userAgent?: string; screenshots?: string[];
    };
    const type = (body.type || '').trim();
    const content = (body.content || '').trim();
    if (!VALID_TYPES.has(type)) {
      return c.json({ ok: false, message: '类型不合法' }, 400);
    }
    if (!content || content.length > 2000) {
      return c.json({ ok: false, message: '内容长度需在 1-2000 字之间' }, 400);
    }

    const user = currentUser(c);
    const moduleVal = (body.module || '').slice(0, 64) || null;
    const contact = (body.contact || '').slice(0, 200) || null;
    const userAgent = (body.userAgent || '').slice(0, 512) || null;
    const screenshots = Array.isArray(body.screenshots)
      ? body.screenshots.filter(s => typeof s === 'string' && /^https?:\/\//.test(s)).slice(0, 6)
      : [];

    const id = await insertFeedback(db, {
      type,
      module: moduleVal,
      content,
      contact,
      screenshotsJson: JSON.stringify(screenshots),
      userId: user?.userId || null,
      userName: user?.userName || null,
      userAgent,
    });
    return c.json({ ok: true, id });
  });

  // POST /api/feedback/upload — 单张截图上传（multipart/form-data, field=file）
  app.post('/upload', async (c) => {
    const form = await c.req.formData();
    const file = form.get('file');
    if (!(file instanceof File)) {
      return c.json({ ok: false, message: '未上传文件' }, 400);
    }
    const mime = file.type || 'image/png';
    if (!ALLOWED_MIME.has(mime)) {
      return c.json({ ok: false, message: `不支持的文件类型：${mime}` }, 400);
    }
    if (file.size > MAX_IMAGE_SIZE) {
      return c.json({ ok: false, message: `图片过大（${(file.size / 1024 / 1024).toFixed(1)}MB）`}, 400);
    }
    const buf = Buffer.from(await file.arrayBuffer());
    try {
      const url = await uploadImage(file.name || 'screenshot.png', buf, mime);
      return c.json({ ok: true, url });
    } catch (e) {
      console.error('feedback upload error:', e);
      return c.json({ ok: false, message: e instanceof Error ? e.message : '上传失败' }, 500);
    }
  });

  // GET /api/feedback/mine — 当前用户的反馈历史
  app.get('/mine', async (c) => {
    await ensureTable();
    const user = currentUser(c);
    if (!user?.userId) return c.json({ items: [] });
    return c.json({ items: await listFeedbackForUser(db, user.userId) });
  });

  // GET /api/feedback/list — 管理列表（仅 BI-ADMIN-FEEDBACK / 全量权限）
  app.get('/list', async (c) => {
    await ensureTable();
    const user = currentUser(c);
    if (!canManageFeedback(user?.roles)) {
      return c.json({ ok: false, message: '无权限' }, 403);
    }
    const limit = Math.min(500, Math.max(1, Number(c.req.query('limit')) || 100));
    const rawStatus = c.req.query('status') || '';
    const status = VALID_STATUS.has(rawStatus) ? rawStatus : null;
    return c.json({ items: await listFeedbackForAdmin(db, { status, limit }) });
  });

  // PATCH /api/feedback/:id — 管理：更新状态与回复（仅 BI-ADMIN-FEEDBACK / 全量权限）
  app.patch('/:id', async (c) => {
    await ensureTable();
    const user = currentUser(c);
    if (!canManageFeedback(user?.roles)) {
      return c.json({ ok: false, message: '无权限' }, 403);
    }
    const id = Number(c.req.param('id'));
    if (!Number.isFinite(id) || id <= 0) return c.json({ ok: false, message: 'id 不合法' }, 400);
    const body = await c.req.json().catch(() => ({})) as { status?: string; reply?: string };

    let status: string | undefined;
    if (body.status) {
      if (!VALID_STATUS.has(body.status)) return c.json({ ok: false, message: '状态不合法' }, 400);
      status = body.status;
    }
    const reply = typeof body.reply === 'string'
      ? body.reply.trim().slice(0, 2000)
      : undefined;

    const updated = await updateFeedback(db, id, {
      status,
      reply,
      replyUser: user?.userName || user?.userId || null,
    });
    if (!updated) return c.json({ ok: false, message: '没有可更新的字段' }, 400);
    return c.json({ ok: true });
  });
}

/** 生产用路由器：绑定真实连接池与建表函数。 */
export function createFeedbackRouter(): Hono {
  const app = new Hono();
  registerFeedbackRoutes(app, { db: pool, ensureTable: ensureFeedbackTable });
  return app;
}

const app = createFeedbackRouter();
export default app;