/**
 * 成功案例控制器
 * 基于high.html的最新数据结构 (三轨道弹幕系统)
 */

const db = require('../../config/database');

/**
 * 获取成功案例列表 (按轨道分组)
 * GET /api/success-stories
 * 支持可选的track_type筛选
 */
exports.getList = async (req, res) => {
    try {
        const trackType = req.query.track_type;

        // 构建查询条件
        let whereClause = 'WHERE is_active = 1';
        const params = [];

        if (trackType && ['fast', 'slow', 'medium'].includes(trackType)) {
            whereClause += ' AND track_type = ?';
            params.push(trackType);
        }

        const [stories] = await db.query(
            `SELECT
                id,
                name,
                job,
                company,
                salary,
                avatar_color,
                track_type
            FROM success_stories
            ${whereClause}
            ORDER BY display_order ASC, id ASC`,
            params
        );

        // 按轨道分组
        const grouped = {
            fast: stories.filter(s => s.track_type === 'fast'),
            slow: stories.filter(s => s.track_type === 'slow'),
            medium: stories.filter(s => s.track_type === 'medium')
        };

        return res.json({
            success: true,
            data: grouped
        });
    } catch (error) {
        console.error('获取成功案例失败:', error);
        return res.status(500).json({
            success: false,
            message: '获取成功案例失败',
            error: error.message
        });
    }
};

/**
 * 创建成功案例 (管理员)
 * POST /api/success-stories
 */
exports.create = async (req, res) => {
    try {
        const {
            name,
            job,
            company,
            salary,
            avatar_color,
            track_type,
            display_order
        } = req.body;

        // 验证必填字段
        if (!name || !job || !company || !salary) {
            return res.status(400).json({
                success: false,
                message: '缺少必填字段 (name, job, company, salary)'
            });
        }

        // 验证track_type
        if (track_type && !['fast', 'slow', 'medium'].includes(track_type)) {
            return res.status(400).json({
                success: false,
                message: 'track_type 必须是 fast, slow 或 medium'
            });
        }

        const [result] = await db.query(
            `INSERT INTO success_stories
             (name, job, company, salary, avatar_color, track_type, display_order)
             VALUES (?, ?, ?, ?, ?, ?, ?)`,
            [
                name,
                job,
                company,
                salary,
                avatar_color || '#2563eb',
                track_type || 'fast',
                display_order || 0
            ]
        );

        return res.status(201).json({
            success: true,
            message: '成功案例创建成功',
            data: { id: result.insertId }
        });
    } catch (error) {
        console.error('创建成功案例失败:', error);
        return res.status(500).json({
            success: false,
            message: '创建成功案例失败',
            error: error.message
        });
    }
};

/**
 * 更新成功案例 (管理员)
 * PUT /api/success-stories/:id
 */
exports.update = async (req, res) => {
    try {
        const { id } = req.params;
        const updateData = req.body;

        // 检查案例是否存在
        const [existing] = await db.query(
            'SELECT id FROM success_stories WHERE id = ?',
            [id]
        );

        if (existing.length === 0) {
            return res.status(404).json({
                success: false,
                message: '成功案例不存在'
            });
        }

        const updates = [];
        const params = [];

        const allowedFields = ['name', 'job', 'company', 'salary', 'avatar_color', 'track_type', 'display_order', 'is_active'];

        for (const field of allowedFields) {
            if (updateData[field] !== undefined) {
                // 验证track_type
                if (field === 'track_type' && !['fast', 'slow', 'medium'].includes(updateData[field])) {
                    return res.status(400).json({
                        success: false,
                        message: 'track_type 必须是 fast, slow 或 medium'
                    });
                }
                updates.push(`${field} = ?`);
                params.push(updateData[field]);
            }
        }

        if (updates.length === 0) {
            return res.status(400).json({
                success: false,
                message: '没有要更新的字段'
            });
        }

        params.push(id);
        await db.query(
            `UPDATE success_stories SET ${updates.join(', ')} WHERE id = ?`,
            params
        );

        return res.json({
            success: true,
            message: '成功案例更新成功'
        });
    } catch (error) {
        console.error('更新成功案例失败:', error);
        return res.status(500).json({
            success: false,
            message: '更新成功案例失败',
            error: error.message
        });
    }
};

/**
 * 删除成功案例 (软删除)
 * DELETE /api/success-stories/:id
 */
exports.delete = async (req, res) => {
    try {
        const { id } = req.params;

        const [result] = await db.query(
            'UPDATE success_stories SET is_active = 0 WHERE id = ?',
            [id]
        );

        if (result.affectedRows === 0) {
            return res.status(404).json({
                success: false,
                message: '成功案例不存在'
            });
        }

        return res.json({
            success: true,
            message: '成功案例删除成功'
        });
    } catch (error) {
        console.error('删除成功案例失败:', error);
        return res.status(500).json({
            success: false,
            message: '删除成功案例失败',
            error: error.message
        });
    }
};