import BaseController from "@/base/BaseController.js"
import Router from "utils/router.js"
import routeCache from "utils/cache/RouteCache.js"

/**
 * 路由缓存管理控制器
 * 提供缓存监控、清理等管理功能
 */
class RouteCacheController extends BaseController {
    constructor() {
        super()
    }

    /**
     * 获取缓存统计信息
     */
    async getStats(ctx) {
        const stats = routeCache.getStats()
        return this.success(ctx, stats, "获取缓存统计信息成功")
    }

    /**
     * 清除所有缓存
     */
    async clearAll(ctx) {
        routeCache.clearAll()
        return this.success(ctx, null, "所有缓存已清除")
    }

    /**
     * 清除路由匹配缓存
     */
    async clearRouteMatches(ctx) {
        routeCache.clearRouteMatches()
        return this.success(ctx, null, "路由匹配缓存已清除")
    }

    /**
     * 清除控制器实例缓存
     */
    async clearControllers(ctx) {
        routeCache.clearControllers()
        return this.success(ctx, null, "控制器实例缓存已清除")
    }

    /**
     * 清除中间件组合缓存
     */
    async clearMiddlewares(ctx) {
        routeCache.clearMiddlewares()
        return this.success(ctx, null, "中间件组合缓存已清除")
    }

    /**
     * 清除路由注册缓存
     */
    async clearRegistrations(ctx) {
        routeCache.clearRegistrations()
        return this.success(ctx, null, "路由注册缓存已清除")
    }

    /**
     * 根据文件路径清除相关缓存
     */
    async clearByFile(ctx) {
        const data = this.validateParams(ctx, {
            filePath: { required: true, label: '文件路径' }
        })

        routeCache.clearByFile(data.filePath)
        return this.success(ctx, null, `文件 ${data.filePath} 相关缓存已清除`)
    }

    /**
     * 更新缓存配置
     */
    async updateConfig(ctx) {
        const data = this.validateParams(ctx, {
            enabled: { type: 'boolean', label: '启用状态' },
            maxMatchCacheSize: { type: 'number', label: '路由匹配缓存最大大小' },
            maxControllerCacheSize: { type: 'number', label: '控制器缓存最大大小' },
            maxMiddlewareCacheSize: { type: 'number', label: '中间件缓存最大大小' },
            maxRegistrationCacheSize: { type: 'number', label: '注册缓存最大大小' }
        })

        // 过滤掉undefined值
        const config = Object.fromEntries(
            Object.entries(data).filter(([_, value]) => value !== undefined)
        )

        routeCache.updateConfig(config)
        return this.success(ctx, routeCache.getStats(), "缓存配置已更新")
    }

    /**
     * 启用缓存
     */
    async enable(ctx) {
        routeCache.enable()
        return this.success(ctx, null, "路由缓存已启用")
    }

    /**
     * 禁用缓存
     */
    async disable(ctx) {
        routeCache.disable()
        return this.success(ctx, null, "路由缓存已禁用")
    }

    /**
     * 获取缓存健康状态
     */
    async getHealth(ctx) {
        const stats = routeCache.getStats()
        
        // 简单的健康检查逻辑
        const health = {
            status: 'healthy',
            issues: [],
            recommendations: []
        }

        // 检查命中率
        const overallHitRate = parseFloat(stats.hitRate)
        if (overallHitRate < 50) {
            health.status = 'warning'
            health.issues.push('总体缓存命中率较低')
            health.recommendations.push('考虑调整缓存策略或检查路由模式')
        }

        // 检查缓存大小
        Object.entries(stats.caches).forEach(([cacheType, cacheStats]) => {
            if (cacheStats.size > 500) {
                health.issues.push(`${cacheType} 缓存大小过大 (${cacheStats.size})`)
                health.recommendations.push(`考虑清理 ${cacheType} 缓存或调整最大大小`)
            }
        })

        if (health.issues.length > 0 && health.status === 'healthy') {
            health.status = 'warning'
        }

        return this.success(ctx, { ...stats, health }, "获取缓存健康状态成功")
    }

    /**
     * 创建路由
     */
    static createRoutes() {
        const controller = new RouteCacheController()
        const router = new Router({ prefix: '/api/system/route-cache' })

        // 缓存统计
        router.get('/stats', controller.handleRequest(controller.getStats), { auth: true })
        router.get('/health', controller.handleRequest(controller.getHealth), { auth: true })

        // 缓存清理
        router.delete('/clear/all', controller.handleRequest(controller.clearAll), { auth: true })
        router.delete('/clear/routes', controller.handleRequest(controller.clearRouteMatches), { auth: true })
        router.delete('/clear/controllers', controller.handleRequest(controller.clearControllers), { auth: true })
        router.delete('/clear/middlewares', controller.handleRequest(controller.clearMiddlewares), { auth: true })
        router.delete('/clear/registrations', controller.handleRequest(controller.clearRegistrations), { auth: true })
        router.delete('/clear/file', controller.handleRequest(controller.clearByFile), { auth: true })

        // 缓存配置
        router.put('/config', controller.handleRequest(controller.updateConfig), { auth: true })
        router.post('/enable', controller.handleRequest(controller.enable), { auth: true })
        router.post('/disable', controller.handleRequest(controller.disable), { auth: true })

        return router
    }
}

export default RouteCacheController