import type { ResultSetHeader, RowDataPacket } from 'mysql2';

/**
 * 反馈表的全部 SQL 出口。
 *
 * SQL 与参数顺序在此固定：路由只做校验与组装，不再拼 SQL。
 * 接口由 mock pool 的契约测试锁定（见 routes.test.ts）。
 */

/** 只需要 query 能力的最小依赖，便于在测试中注入 mock。 */
export interface Database {
  query<T = any>(sql: string, values?: unknown[]): Promise<[T, ...any[]]>;
}

// 写入时间戳一律用东八区 CST，避免依赖 MySQL/容器时区设置。
const CST_NOW = `DATE_ADD(UTC_TIMESTAMP(), INTERVAL 8 HOUR)`;

// 两个列表接口的列集合刻意不同：管理列表额外返回 user_id / user_name。
const USER_LIST_COLUMNS = `id, type, module, content, contact, screenshots, status,
            reply_content, reply_user, reply_at, created_at`;
const ADMIN_LIST_COLUMNS = `id, type, module, content, contact, screenshots, user_id, user_name, status,
            reply_content, reply_user, reply_at, created_at`;

export interface NewFeedback {
  type: string;
  module: string | null;
  content: string;
  contact: string | null;
  screenshotsJson: string;
  userId: string | null;
  userName: string | null;
  userAgent: string | null;
}

export async function insertFeedback(db: Database, row: NewFeedback): Promise<number> {
  const [result] = await db.query<ResultSetHeader>(
    `INSERT INTO bi_user_feedback (type, module, content, contact, screenshots, user_id, user_name, user_agent, created_at)
     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ${CST_NOW})`,
    [row.type, row.module, row.content, row.contact, row.screenshotsJson, row.userId, row.userName, row.userAgent],
  );
  return result.insertId;
}

/** 当前用户的反馈历史（最多 100 条）。 */
export async function listFeedbackForUser(db: Database, userId: string): Promise<RowDataPacket[]> {
  const [rows] = await db.query<RowDataPacket[]>(
    `SELECT ${USER_LIST_COLUMNS}
       FROM bi_user_feedback
       WHERE user_id = ?
       ORDER BY created_at DESC
       LIMIT 100`,
    [userId],
  );
  return rows;
}

/** 管理列表：可选状态过滤 + 条数上限。 */
export async function listFeedbackForAdmin(
  db: Database,
  options: { status: string | null; limit: number },
): Promise<RowDataPacket[]> {
  const where: string[] = ['1=1'];
  const params: (string | number)[] = [];
  if (options.status) {
    where.push('status = ?');
    params.push(options.status);
  }
  const [rows] = await db.query<RowDataPacket[]>(
    `SELECT ${ADMIN_LIST_COLUMNS}
       FROM bi_user_feedback
       WHERE ${where.join(' AND ')}
       ORDER BY created_at DESC
       LIMIT ?`,
    [...params, options.limit],
  );
  return rows;
}

export interface FeedbackUpdate {
  status?: string;
  /** 传 undefined 表示不更新回复；传 null/'' 表示清空。 */
  reply?: string | null;
  replyUser?: string | null;
}

/** 管理更新。返回 false 表示没有任何可更新字段。 */
export async function updateFeedback(db: Database, id: number, update: FeedbackUpdate): Promise<boolean> {
  const fields: string[] = [];
  const params: (string | number | null)[] = [];
  if (update.status !== undefined) {
    fields.push('status = ?');
    params.push(update.status);
  }
  if (update.reply !== undefined) {
    fields.push('reply_content = ?', 'reply_user = ?', `reply_at = ${CST_NOW}`);
    params.push(update.reply || null, update.replyUser ?? null);
  }
  if (fields.length === 0) return false;
  await db.query(
    `UPDATE bi_user_feedback SET ${fields.join(', ')} WHERE id = ?`,
    [...params, id],
  );
  return true;
}