package handlers

import (
	"fmt"
	"log"
	"net/http"
	"path/filepath"
	"time"
	"tonav-go/database"
	"tonav-go/models"
	config "tonav-go/utils"

	"github.com/gin-gonic/gin"
)

// GetSettings 获取设置
func GetSettings(c *gin.Context) {
	var settings []models.Setting
	database.DB.Find(&settings)

	res := make(map[string]string)
	for _, s := range settings {
		res[s.Key] = s.Value
	}
	c.JSON(http.StatusOK, res)
}

// SaveSettings 保存设置
func SaveSettings(c *gin.Context) {
	var input map[string]string
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, Response{Success: false, Message: err.Error()})
		return
	}

	for k, v := range input {
		database.DB.Save(&models.Setting{Key: k, Value: v})
	}
	c.JSON(http.StatusOK, Response{Success: true, Message: "设置已保存"})
}

// getWebDAVClient 从数据库配置构建 WebDAV 客户端
func getWebDAVClient() (*config.WebDAVClient, error) {
	var url, user, pass models.Setting
	database.DB.Where("key = ?", "webdav_url").First(&url)
	database.DB.Where("key = ?", "webdav_user").First(&user)
	database.DB.Where("key = ?", "webdav_password").First(&pass)

	if url.Value == "" {
		return nil, fmt.Errorf("未配置 WebDAV URL")
	}
	return config.NewWebDAVClient(url.Value, user.Value, pass.Value), nil
}

// RunCloudBackup 执行云端备份
func RunCloudBackup(c *gin.Context) {
	client, err := getWebDAVClient()
	if err != nil {
		c.JSON(http.StatusBadRequest, Response{Success: false, Message: err.Error()})
		return
	}

	// 获取数据库路径
	cfg := config.LoadConfig()
	backupPath, err := config.CreateBackup(cfg.DBPath)
	if err != nil {
		c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "本地备份失败: " + err.Error()})
		return
	}

	// 上传时只用文件名，不带路径
	remoteName := filepath.Base(backupPath)
	err = client.Upload(backupPath, remoteName)
	if err != nil {
		c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "云端上传失败: " + err.Error()})
		return
	}

	// 清理本地旧备份，保留最近5份
	config.CleanOldBackups(5)

	c.JSON(http.StatusOK, Response{Success: true, Message: "备份成功: " + remoteName})
}

// ListCloudBackups 列出云端备份
func ListCloudBackups(c *gin.Context) {
	client, err := getWebDAVClient()
	if err != nil {
		c.JSON(http.StatusOK, gin.H{"files": []interface{}{}})
		return
	}

	files, err := client.List()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"files": files})
}

// DeleteCloudBackup 删除云端备份
func DeleteCloudBackup(c *gin.Context) {
	name := c.Query("name")
	if name == "" {
		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "缺少备份文件名"})
		return
	}

	client, err := getWebDAVClient()
	if err != nil {
		c.JSON(http.StatusBadRequest, Response{Success: false, Message: err.Error()})
		return
	}

	if err := client.Delete(name); err != nil {
		c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "删除失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, Response{Success: true, Message: "已删除: " + name})
}

// RestoreCloudBackup 从云端备份恢复
func RestoreCloudBackup(c *gin.Context) {
	name := c.Query("name")
	if name == "" {
		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "缺少备份文件名"})
		return
	}

	client, err := getWebDAVClient()
	if err != nil {
		c.JSON(http.StatusBadRequest, Response{Success: false, Message: err.Error()})
		return
	}

	cfg := config.LoadConfig()

	// 恢复前先备份当前数据库
	preBackup, err := config.CreateBackup(cfg.DBPath)
	if err != nil {
		log.Printf("恢复前备份失败: %v", err)
	} else {
		log.Printf("恢复前已备份当前数据库: %s", preBackup)
	}

	// 下载云端备份到临时文件
	tmpPath := "backups/restore_tmp.db"
	if err := client.Download(name, tmpPath); err != nil {
		c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "下载备份失败: " + err.Error()})
		return
	}

	// 关闭当前数据库连接
	sqlDB, err := database.DB.DB()
	if err == nil {
		sqlDB.Close()
	}

	// 用下载的备份替换当前数据库
	if err := config.ReplaceDB(tmpPath, cfg.DBPath); err != nil {
		// 尝试重新连接原数据库
		database.InitDB(cfg.DBPath)
		c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "替换数据库失败: " + err.Error()})
		return
	}

	// 重新初始化数据库连接
	database.InitDB(cfg.DBPath)

	c.JSON(http.StatusOK, Response{Success: true, Message: fmt.Sprintf("已从 %s 恢复，恢复前备份: %s", name, filepath.Base(preBackup))})
}

// StartAutoBackup 启动定时自动备份
func StartAutoBackup() {
	go func() {
		for {
			// 计算距离下一个凌晨3点的时间
			now := time.Now()
			next := time.Date(now.Year(), now.Month(), now.Day(), 3, 0, 0, 0, now.Location())
			if next.Before(now) {
				next = next.Add(24 * time.Hour)
			}
			timer := time.NewTimer(next.Sub(now))
			<-timer.C

			// 检查是否启用了自动备份
			var setting models.Setting
			database.DB.Where("key = ?", "auto_backup").First(&setting)
			if setting.Value != "true" {
				continue
			}

			log.Println("开始执行自动备份...")
			doAutoBackup()
		}
	}()
}

func doAutoBackup() {
	client, err := getWebDAVClient()
	if err != nil {
		log.Printf("自动备份失败（WebDAV未配置）: %v", err)
		return
	}

	cfg := config.LoadConfig()
	backupPath, err := config.CreateBackup(cfg.DBPath)
	if err != nil {
		log.Printf("自动备份失败（本地备份）: %v", err)
		return
	}

	remoteName := filepath.Base(backupPath)
	if err := client.Upload(backupPath, remoteName); err != nil {
		log.Printf("自动备份失败（上传）: %v", err)
		return
	}

	config.CleanOldBackups(5)
	log.Printf("自动备份成功: %s", remoteName)
}