const express = require("express");
const router = express.Router();
const db = require("../db/mysql");
const authMiddleware = require("../middleware/authMiddleware");


// 获取用户信息
router.get(
    "/userInfo",
    authMiddleware,
    (req, res) => {
        res.json({
            code: 200,
            data: {
                username: req.user.username
            }
        });

    }
);

// 获取联系人列表
router.get(
    "/contactsInfo",
    authMiddleware,
    (req, res) => {         
        const sql = `
            SELECT
                u.username
            FROM chat_mysql.contacts c
            JOIN chat_mysql.users u
                ON c.contact_name = u.username
            WHERE c.user_name = ?;
        `;
        db.query(sql, [req.user.username], (error, results) => {
            if (error) {
                console.error("数据库查询失败：", error);

                return res.status(500).json({
                    code: 500,
                    message: "查询失败",
                });
            }
            if (results.length > 0) {
                res.json({
                    code: 200,
                    message: "查询成功",
                    data: {
                        contacts: results.map(contact => ({
                            contactName: contact.username
                        }))
                    },
                });
            } else {
                res.json({
                    code: 401,
                    message: "未找到联系人",
                    data: {
                        contacts: []
                    }
                });
            }
        });

    }
);

// 获取所有聊天消息
router.get(
    "/messagesInfo",
    authMiddleware,
    (req, res) => {    
        const currentUserName = req.user.username;     
        const sql = `
            SELECT
                id,
                sender_name,
                receiver_name,
                content,
                created_at
            FROM chat_mysql.messages
            WHERE sender_name = ? OR receiver_name = ?
            ORDER BY created_at ASC;
        `;
        db.query(sql, [currentUserName, currentUserName], (error, results) => {
            if (error) {
                console.error("数据库查询失败：", error);

                return res.status(500).json({
                    code: 500,
                    message: "查询失败",
                });
            }
            if (results.length > 0) {
                res.json({
                    code: 200,
                    message: "查询成功",
                    data: {
                        messages: results.map(message => ({
                            messageId: message.id,
                            senderName: message.sender_name,
                            receiverName: message.receiver_name,
                            content: message.content,
                            createdAt: message.created_at
                        }))
                    },
                });
            } else {
                res.json({
                    code: 401,
                    message: "未找到联系人消息",
                    data: {
                        messages: []
                    }
                });
            }
        });

    }
);

// 写入聊天消息
router.post("/sendMessage", (req, res) => {
    const sql = `
    INSERT INTO users (username, password)
    VALUES (?, ?)
  `;

    db.query(sql, [username, password], (error, result) => {
        if (error) {
            console.error(error);

            return res.status(500).json({
                code: 500,
                message: "注册失败",
            });
        }

        res.json({
            code: 200,
            message: "注册成功",
            data: {
                id: result.insertId,
            },
        });
    });
});


module.exports = router;