package controller

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"one-api/common"
	"one-api/model"
	"one-api/setting"
	"one-api/setting/system_setting"
	"regexp"
	"strings"

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

func validateApiInfo(apiInfoStr string) error {
	if apiInfoStr == "" {
		return nil // 空字符串是合法的
	}
	
	var apiInfoList []map[string]interface{}
	if err := json.Unmarshal([]byte(apiInfoStr), &apiInfoList); err != nil {
		return fmt.Errorf("API信息格式错误：%s", err.Error())
	}
	
	// 验证数组长度
	if len(apiInfoList) > 50 {
		return fmt.Errorf("API信息数量不能超过50个")
	}
	
	// 允许的颜色值
	validColors := map[string]bool{
		"blue": true, "green": true, "cyan": true, "purple": true, "pink": true,
		"red": true, "orange": true, "amber": true, "yellow": true, "lime": true,
		"light-green": true, "teal": true, "light-blue": true, "indigo": true,
		"violet": true, "grey": true,
	}
	
	// URL正则表达式
	urlRegex := regexp.MustCompile(`^https?://[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*(/.*)?$`)
	
	for i, apiInfo := range apiInfoList {
		// 检查必填字段
		urlStr, ok := apiInfo["url"].(string)
		if !ok || urlStr == "" {
			return fmt.Errorf("第%d个API信息缺少URL字段", i+1)
		}
		
		route, ok := apiInfo["route"].(string)
		if !ok || route == "" {
			return fmt.Errorf("第%d个API信息缺少线路描述字段", i+1)
		}
		
		description, ok := apiInfo["description"].(string)
		if !ok || description == "" {
			return fmt.Errorf("第%d个API信息缺少说明字段", i+1)
		}
		
		color, ok := apiInfo["color"].(string)
		if !ok || color == "" {
			return fmt.Errorf("第%d个API信息缺少颜色字段", i+1)
		}
		
		// 验证URL格式
		if !urlRegex.MatchString(urlStr) {
			return fmt.Errorf("第%d个API信息的URL格式不正确", i+1)
		}
		
		// 验证URL可解析性
		if _, err := url.Parse(urlStr); err != nil {
			return fmt.Errorf("第%d个API信息的URL无法解析：%s", i+1, err.Error())
		}
		
		// 验证字段长度
		if len(urlStr) > 500 {
			return fmt.Errorf("第%d个API信息的URL长度不能超过500字符", i+1)
		}
		
		if len(route) > 100 {
			return fmt.Errorf("第%d个API信息的线路描述长度不能超过100字符", i+1)
		}
		
		if len(description) > 200 {
			return fmt.Errorf("第%d个API信息的说明长度不能超过200字符", i+1)
		}
		
		// 验证颜色值
		if !validColors[color] {
			return fmt.Errorf("第%d个API信息的颜色值不合法", i+1)
		}
		
		// 检查并过滤危险字符（防止XSS）
		dangerousChars := []string{"<script", "<iframe", "javascript:", "onload=", "onerror=", "onclick="}
		for _, dangerous := range dangerousChars {
			if strings.Contains(strings.ToLower(description), dangerous) {
				return fmt.Errorf("第%d个API信息的说明包含不允许的内容", i+1)
			}
			if strings.Contains(strings.ToLower(route), dangerous) {
				return fmt.Errorf("第%d个API信息的线路描述包含不允许的内容", i+1)
			}
		}
	}
	
	return nil
}

func GetOptions(c *gin.Context) {
	var options []*model.Option
	common.OptionMapRWMutex.Lock()
	for k, v := range common.OptionMap {
		if strings.HasSuffix(k, "Token") || strings.HasSuffix(k, "Secret") || strings.HasSuffix(k, "Key") {
			continue
		}
		options = append(options, &model.Option{
			Key:   k,
			Value: common.Interface2String(v),
		})
	}
	common.OptionMapRWMutex.Unlock()
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
		"data":    options,
	})
	return
}

func UpdateOption(c *gin.Context) {
	var option model.Option
	err := json.NewDecoder(c.Request.Body).Decode(&option)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"success": false,
			"message": "无效的参数",
		})
		return
	}
	switch option.Key {
	case "GitHubOAuthEnabled":
		if option.Value == "true" && common.GitHubClientId == "" {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": "无法启用 GitHub OAuth，请先填入 GitHub Client Id 以及 GitHub Client Secret！",
			})
			return
		}
	case "oidc.enabled":
		if option.Value == "true" && system_setting.GetOIDCSettings().ClientId == "" {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": "无法启用 OIDC 登录，请先填入 OIDC Client Id 以及 OIDC Client Secret！",
			})
			return
		}
	case "LinuxDOOAuthEnabled":
		if option.Value == "true" && common.LinuxDOClientId == "" {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": "无法启用 LinuxDO OAuth，请先填入 LinuxDO Client Id 以及 LinuxDO Client Secret！",
			})
			return
		}
	case "EmailDomainRestrictionEnabled":
		if option.Value == "true" && len(common.EmailDomainWhitelist) == 0 {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": "无法启用邮箱域名限制，请先填入限制的邮箱域名！",
			})
			return
		}
	case "WeChatAuthEnabled":
		if option.Value == "true" && common.WeChatServerAddress == "" {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": "无法启用微信登录，请先填入微信登录相关配置信息！",
			})
			return
		}
	case "TurnstileCheckEnabled":
		if option.Value == "true" && common.TurnstileSiteKey == "" {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": "无法启用 Turnstile 校验，请先填入 Turnstile 校验相关配置信息！",
			})

			return
		}
	case "TelegramOAuthEnabled":
		if option.Value == "true" && common.TelegramBotToken == "" {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": "无法启用 Telegram OAuth，请先填入 Telegram Bot Token！",
			})
			return
		}
	case "GroupRatio":
		err = setting.CheckGroupRatio(option.Value)
		if err != nil {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": err.Error(),
			})
			return
		}
	case "ModelRequestRateLimitGroup":
		err = setting.CheckModelRequestRateLimitGroup(option.Value)
		if err != nil {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": err.Error(),
			})
			return
		}
	case "ApiInfo":
		err = validateApiInfo(option.Value)
		if err != nil {
			c.JSON(http.StatusOK, gin.H{
				"success": false,
				"message": err.Error(),
			})
			return
		}
	}
	err = model.UpdateOption(option.Key, option.Value)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{
			"success": false,
			"message": err.Error(),
		})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "",
	})
	return
}