import { Request, Response } from 'express'
import pool from '../utils/db'
import { RowDataPacket } from 'mysql2'

// GET /api/config/:key - 公开获取配置
export async function getConfig(req: Request, res: Response): Promise<void> {
  try {
    const { key } = req.params
    const [rows] = await pool.execute<RowDataPacket[]>(
      'SELECT config_value FROM system_configs WHERE config_key = ?',
      [key]
    )
    if (rows.length === 0) {
      res.json({ code: 0, data: null })
      return
    }
    let value = rows[0].config_value
    try { value = JSON.parse(value) } catch { /* keep as string */ }
    res.json({ code: 0, data: value })
  } catch (err) {
    console.error('getConfig error:', err)
    res.status(500).json({ code: 500, message: '获取配置失败' })
  }
}

// GET /api/admin/configs - 管理后台获取所有配置
export async function adminGetConfigs(_req: Request, res: Response): Promise<void> {
  try {
    const [rows] = await pool.execute<RowDataPacket[]>(
      'SELECT id, config_key, config_value, updated_at FROM system_configs ORDER BY id ASC'
    )
    const data = rows.map((r: any) => {
      let val = r.config_value
      try { val = JSON.parse(val) } catch { /* keep */ }
      return { ...r, config_value: val }
    })
    res.json({ code: 0, data })
  } catch (err) {
    console.error('adminGetConfigs error:', err)
    res.status(500).json({ code: 500, message: '获取配置列表失败' })
  }
}

// PUT /api/admin/configs/:key - 管理后台更新配置
export async function adminUpdateConfig(req: Request, res: Response): Promise<void> {
  try {
    const { key } = req.params
    const { value } = req.body
    const strValue = typeof value === 'string' ? value : JSON.stringify(value)
    await pool.execute(
      'INSERT INTO system_configs (config_key, config_value) VALUES (?, ?) ON DUPLICATE KEY UPDATE config_value = ?',
      [key, strValue, strValue]
    )
    res.json({ code: 0, message: '更新成功' })
  } catch (err) {
    console.error('adminUpdateConfig error:', err)
    res.status(500).json({ code: 500, message: '更新配置失败' })
  }
}