// Copyright 2026 Arctel.net
// SPDX-License-Identifier: Apache-2.0

package admin

import (
	"context"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

	"github.com/Rain-kl/Wavelet/internal/infra/diskcache"
	"github.com/Rain-kl/Wavelet/internal/model"
	"github.com/Rain-kl/Wavelet/internal/repository"
	"github.com/Rain-kl/Wavelet/internal/shared/response"
)

type updateCacheConfigRequest struct {
	MaxSizeMB  int64 `json:"max_size_mb" binding:"required,min=1"`
	TTLMinutes int64 `json:"ttl_minutes" binding:"required,min=0"`
	LRUEnabled bool  `json:"lru_enabled"`
}

// GetCacheStatus 获取磁盘缓存状态与当前统计数据
// @Summary 获取缓存状态
// @Description 获取当前系统磁盘缓存的使用情况（已占用字节、Key 数量等）与策略配置
// @Tags admin
// @Produce json
// @Security SessionCookie
// @Success 200 {object} response.Any{data=diskcache.Status} "获取成功"
// @Failure 401 {object} response.Any "未登录"
// @Failure 403 {object} response.Any "无管理员权限"
// @Failure 500 {object} response.Any "内部错误"
// @Router /api/v1/admin/cache/status [get]
func GetCacheStatus(c *gin.Context) {
	status := diskcache.GetGlobalCache().Status()
	c.JSON(http.StatusOK, response.OK(status))
}

// UpdateCacheConfig 更新磁盘缓存策略配置
// @Summary 更新缓存配置
// @Description 更改磁盘缓存最大容量限制、文件生存时间（TTL）以及是否启用 LRU 淘汰淘汰算法，并进行热更新
// @Tags admin
// @Accept json
// @Produce json
// @Param request body updateCacheConfigRequest true "缓存配置请求体"
// @Security SessionCookie
// @Success 200 {object} response.Any "更新成功"
// @Failure 400 {object} response.Any "参数错误"
// @Failure 401 {object} response.Any "未登录"
// @Failure 403 {object} response.Any "无管理员权限"
// @Failure 500 {object} response.Any "服务内部错误"
// @Router /api/v1/admin/cache/config [post]
func UpdateCacheConfig(c *gin.Context) {
	var req updateCacheConfigRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortBadRequest(c, err.Error())
		return
	}

	ctx := c.Request.Context()

	if err := saveOrUpdateCacheConfig(ctx, model.ConfigKeyDiskCacheMaxSizeMB, strconv.FormatInt(req.MaxSizeMB, 10)); err != nil {
		response.AbortInternal(c, err.Error())
		return
	}

	if err := saveOrUpdateCacheConfig(ctx, model.ConfigKeyDiskCacheTTLMinutes, strconv.FormatInt(req.TTLMinutes, 10)); err != nil {
		response.AbortInternal(c, err.Error())
		return
	}

	if err := saveOrUpdateCacheConfig(ctx, model.ConfigKeyDiskCacheLRUEnabled, strconv.FormatBool(req.LRUEnabled)); err != nil {
		response.AbortInternal(c, err.Error())
		return
	}

	diskcache.GetGlobalCache().ReloadConfig(ctx)

	c.JSON(http.StatusOK, response.OKNil())
}

// ClearCache 一键清空所有磁盘缓存数据
// @Summary 清空缓存
// @Description 清除系统磁盘缓存目录中的所有临时文件，并重置缓存容量和 Key 追踪数据
// @Tags admin
// @Produce json
// @Security SessionCookie
// @Success 200 {object} response.Any "清理成功"
// @Failure 401 {object} response.Any "未登录"
// @Failure 403 {object} response.Any "无管理员权限"
// @Failure 500 {object} response.Any "服务内部错误"
// @Router /api/v1/admin/cache/clear [post]
func ClearCache(c *gin.Context) {
	if err := diskcache.GetGlobalCache().Clear(); err != nil {
		response.AbortInternal(c, err.Error())
		return
	}
	c.JSON(http.StatusOK, response.OKNil())
}

func saveOrUpdateCacheConfig(ctx context.Context, key, value string) error {
	return repository.SaveOrUpdateSystemConfig(ctx, key, value)
}