package controller

import (
	"fmt"
	"net/http"
	"one-api/common"
	"one-api/model"
	"strconv"
	"time"

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

// GetAllServers 获取所有服务器配置（管理员）
func GetAllServers(c *gin.Context) {
	p, _ := strconv.Atoi(c.Query("p"))
	if p < 0 {
		p = 0
	}
	pageSize, _ := strconv.Atoi(c.Query("page_size"))
	if pageSize <= 0 {
		pageSize = common.ItemsPerPage
	}

	pageInfo := &common.PageInfo{
		Page:     p,
		PageSize: pageSize,
	}

	servers, total, err := model.GetAllServers(pageInfo)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    servers,
		"total":   total,
	})
}

// SearchServers 搜索服务器配置（管理员）
func SearchServers(c *gin.Context) {
	keyword := c.Query("keyword")
	p, _ := strconv.Atoi(c.Query("p"))
	if p < 0 {
		p = 0
	}
	pageSize, _ := strconv.Atoi(c.Query("page_size"))
	if pageSize <= 0 {
		pageSize = common.ItemsPerPage
	}

	servers, total, err := model.SearchServers(keyword, p*pageSize, pageSize)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    servers,
		"total":   total,
	})
}

// GetServer 获取单个服务器配置（管理员）
func GetServer(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	server, err := model.GetServerById(id)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    server,
	})
}

// AddServer 添加服务器配置（管理员）
func AddServer(c *gin.Context) {
	server := model.Server{}
	err := c.ShouldBindJSON(&server)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	err = server.Insert()
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    server,
	})
}

// UpdateServer 更新服务器配置（管理员）
func UpdateServer(c *gin.Context) {
	server := model.Server{}
	err := c.ShouldBindJSON(&server)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	err = server.Update()
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    server,
	})
}

// DeleteServer 删除服务器配置（管理员）
func DeleteServer(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	err = model.DeleteServerById(id)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
	})
}

// GetEnabledServers 获取启用的服务器列表（用户）
func GetEnabledServers(c *gin.Context) {
	servers, err := model.GetEnabledServers()
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    servers,
	})
}

// GetAllPurchasedServers 获取所有已购服务器（管理员）
func GetAllPurchasedServers(c *gin.Context) {
	p, _ := strconv.Atoi(c.Query("p"))
	if p < 0 {
		p = 0
	}
	pageSize, _ := strconv.Atoi(c.Query("page_size"))
	if pageSize <= 0 {
		pageSize = common.ItemsPerPage
	}

	pageInfo := &common.PageInfo{
		Page:     p,
		PageSize: pageSize,
	}

	servers, total, err := model.GetAllPurchasedServers(pageInfo)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}

	// 获取用户名
	type PurchasedServerWithUsername struct {
		model.PurchasedServer
		Username string `json:"username"`
	}

	serversWithUsername := make([]PurchasedServerWithUsername, len(servers))
	for i, server := range servers {
		username, _ := model.GetUsernameById(server.UserId, false)
		serversWithUsername[i] = PurchasedServerWithUsername{
			PurchasedServer: *server,
			Username:        username,
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    serversWithUsername,
		"total":   total,
	})
}

// SearchPurchasedServers 搜索已购服务器（管理员）
func SearchPurchasedServers(c *gin.Context) {
	keyword := c.Query("keyword")
	p, _ := strconv.Atoi(c.Query("p"))
	if p < 0 {
		p = 0
	}
	pageSize, _ := strconv.Atoi(c.Query("page_size"))
	if pageSize <= 0 {
		pageSize = common.ItemsPerPage
	}

	servers, total, err := model.SearchPurchasedServers(keyword, p*pageSize, pageSize)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}

	// 获取用户名
	type PurchasedServerWithUsername struct {
		model.PurchasedServer
		Username string `json:"username"`
	}

	serversWithUsername := make([]PurchasedServerWithUsername, len(servers))
	for i, server := range servers {
		username, _ := model.GetUsernameById(server.UserId, false)
		serversWithUsername[i] = PurchasedServerWithUsername{
			PurchasedServer: *server,
			Username:        username,
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    serversWithUsername,
		"total":   total,
	})
}

// GetUserPurchasedServers 获取用户已购服务器列表
func GetUserPurchasedServers(c *gin.Context) {
	userId := c.GetInt("id")
	p, _ := strconv.Atoi(c.Query("p"))
	if p < 0 {
		p = 0
	}
	pageSize, _ := strconv.Atoi(c.Query("page_size"))
	if pageSize <= 0 {
		pageSize = common.ItemsPerPage
	}

	pageInfo := &common.PageInfo{
		Page:     p,
		PageSize: pageSize,
	}

	servers, total, err := model.GetUserPurchasedServers(userId, pageInfo)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    servers,
		"total":   total,
	})
}

type PurchaseServerRequest struct {
	ServerId int    `json:"server_id" binding:"required"`
	TradeNo  string `json:"trade_no"`
}

// PurchaseServer 购买服务器
func PurchaseServer(c *gin.Context) {
	var req PurchaseServerRequest
	err := c.ShouldBindJSON(&req)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": "参数错误",
		})
		return
	}

	userId := c.GetInt("id")

	// 获取服务器配置
	server, err := model.GetServerById(req.ServerId)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": "服务器配置不存在",
		})
		return
	}

	if server.Status != 1 {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": "服务器已下架",
		})
		return
	}

	// 检查库存
	if server.Stock == 0 {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": "服务器库存不足",
		})
		return
	}

	// 计算需要扣除的额度
	dPrice := decimal.NewFromFloat(server.Price)
	dQuotaPerUnit := decimal.NewFromFloat(common.QuotaPerUnit)
	quotaNeeded := int(dPrice.Mul(dQuotaPerUnit).IntPart())

	// 检查用户额度
	userQuota, err := model.GetUserQuota(userId, true)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": "获取用户额度失败",
		})
		return
	}

	if userQuota < quotaNeeded {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": fmt.Sprintf("额度不足，需要 %s，当前额度 %s", common.LogQuota(quotaNeeded), common.LogQuota(userQuota)),
		})
		return
	}

	// 扣除用户额度
	err = model.DecreaseUserQuota(userId, quotaNeeded)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": "扣除额度失败",
		})
		return
	}

	// 创建已购服务器记录
	now := time.Now().Unix()
	expireTime := now + int64(server.Duration*24*3600)

	tradeNo := req.TradeNo
	if tradeNo == "" {
		tradeNo = fmt.Sprintf("SRV%dNO%s", userId, fmt.Sprintf("%s%d", common.GetRandomString(6), time.Now().Unix()))
	}

	purchasedServer := &model.PurchasedServer{
		UserId:       userId,
		ServerId:     server.Id,
		ServerTitle:  server.Title,
		ServerConfig: server.Config,
		Price:        server.Price,
		Duration:     server.Duration,
		PurchaseTime: now,
		ExpireTime:   expireTime,
		Status:       1,
		TradeNo:      tradeNo,
	}

	err = purchasedServer.Insert()
	if err != nil {
		// 回滚额度
		_ = model.IncreaseUserQuota(userId, quotaNeeded, true)
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": "创建订单失败",
		})
		return
	}

	// 更新库存
	if server.Stock > 0 {
		server.Stock--
		_ = server.Update()
	}

	// 记录日志
	model.RecordLog(userId, model.LogTypeSystem, fmt.Sprintf("购买服务器 %s，消耗额度 %s，有效期 %d 天", server.Title, common.LogQuota(quotaNeeded), server.Duration))

	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "购买成功",
		"data":    purchasedServer,
	})
}

// DeletePurchasedServer 删除已购服务器记录（管理员）
func DeletePurchasedServer(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	err = model.DeletePurchasedServerById(id)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
	})
}