package console_setting

import (
    "encoding/json"
    "fmt"
    "net/url"
    "regexp"
    "strings"
    "time"
    "sort"
)

var (
    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])?|(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(?:\:[0-9]{1,5})?(?:/.*)?$`)
    dangerousChars = []string{"<script", "<iframe", "javascript:", "onload=", "onerror=", "onclick="}
    validColors = map[string]bool{
        "blue": true, "green": true, "cyan": true, "purple": true, "pink": true,
        "red": true, "orange": true, "amber": true, "yellow": true, "lime": true,
        "light-green": true, "teal": true, "light-blue": true, "indigo": true,
        "violet": true, "grey": true,
    }
    slugRegex = regexp.MustCompile(`^[a-zA-Z0-9_-]+$`)
)

func parseJSONArray(jsonStr string, typeName string) ([]map[string]interface{}, error) {
    var list []map[string]interface{}
    if err := json.Unmarshal([]byte(jsonStr), &list); err != nil {
        return nil, fmt.Errorf("%s格式错误：%s", typeName, err.Error())
    }
    return list, nil
}

func validateURL(urlStr string, index int, itemType string) error {
    if !urlRegex.MatchString(urlStr) {
        return fmt.Errorf("第%d个%s的URL格式不正确", index, itemType)
    }
    if _, err := url.Parse(urlStr); err != nil {
        return fmt.Errorf("第%d个%s的URL无法解析：%s", index, itemType, err.Error())
    }
    return nil
}

func checkDangerousContent(content string, index int, itemType string) error {
    lower := strings.ToLower(content)
    for _, d := range dangerousChars {
        if strings.Contains(lower, d) {
            return fmt.Errorf("第%d个%s包含不允许的内容", index, itemType)
        }
    }
    return nil
}

func getJSONList(jsonStr string) []map[string]interface{} {
    if jsonStr == "" {
        return []map[string]interface{}{}
    }
    var list []map[string]interface{}
    json.Unmarshal([]byte(jsonStr), &list)
    return list
}

func ValidateConsoleSettings(settingsStr string, settingType string) error {
    if settingsStr == "" {
        return nil
    }

    switch settingType {
    case "ApiInfo":
        return validateApiInfo(settingsStr)
    case "Announcements":
        return validateAnnouncements(settingsStr)
    case "FAQ":
        return validateFAQ(settingsStr)
    case "UptimeKumaGroups":
        return validateUptimeKumaGroups(settingsStr)
    default:
        return fmt.Errorf("未知的设置类型：%s", settingType)
    }
}

func validateApiInfo(apiInfoStr string) error {
    apiInfoList, err := parseJSONArray(apiInfoStr, "API信息")
    if err != nil {
        return err
    }

    if len(apiInfoList) > 50 {
        return fmt.Errorf("API信息数量不能超过50个")
    }

    for i, apiInfo := range apiInfoList {
        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)
        }

        if err := validateURL(urlStr, i+1, "API信息"); err != nil {
            return err
        }

        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)
        }

        if !validColors[color] {
            return fmt.Errorf("第%d个API信息的颜色值不合法", i+1)
        }

        if err := checkDangerousContent(description, i+1, "API信息"); err != nil {
            return err
        }
        if err := checkDangerousContent(route, i+1, "API信息"); err != nil {
            return err
        }
    }
    return nil
}

func GetApiInfo() []map[string]interface{} {
    return getJSONList(GetConsoleSetting().ApiInfo)
}

func validateAnnouncements(announcementsStr string) error {
    list, err := parseJSONArray(announcementsStr, "系统公告")
    if err != nil {
        return err
    }
    if len(list) > 100 {
        return fmt.Errorf("系统公告数量不能超过100个")
    }
    validTypes := map[string]bool{
        "default": true, "ongoing": true, "success": true, "warning": true, "error": true,
    }
    for i, ann := range list {
        content, ok := ann["content"].(string)
        if !ok || content == "" {
            return fmt.Errorf("第%d个公告缺少内容字段", i+1)
        }
        publishDateAny, exists := ann["publishDate"]
        if !exists {
            return fmt.Errorf("第%d个公告缺少发布日期字段", i+1)
        }
        publishDateStr, ok := publishDateAny.(string)
        if !ok || publishDateStr == "" {
            return fmt.Errorf("第%d个公告的发布日期不能为空", i+1)
        }
        if _, err := time.Parse(time.RFC3339, publishDateStr); err != nil {
            return fmt.Errorf("第%d个公告的发布日期格式错误", i+1)
        }
        if t, exists := ann["type"]; exists {
            if typeStr, ok := t.(string); ok {
                if !validTypes[typeStr] {
                    return fmt.Errorf("第%d个公告的类型值不合法", i+1)
                }
            }
        }
        if len(content) > 500 {
            return fmt.Errorf("第%d个公告的内容长度不能超过500字符", i+1)
        }
        if extra, exists := ann["extra"]; exists {
            if extraStr, ok := extra.(string); ok && len(extraStr) > 200 {
                return fmt.Errorf("第%d个公告的说明长度不能超过200字符", i+1)
            }
        }
    }
    return nil
}

func validateFAQ(faqStr string) error {
    list, err := parseJSONArray(faqStr, "FAQ信息")
    if err != nil {
        return err
    }
    if len(list) > 100 {
        return fmt.Errorf("FAQ数量不能超过100个")
    }
    for i, faq := range list {
        question, ok := faq["question"].(string)
        if !ok || question == "" {
            return fmt.Errorf("第%d个FAQ缺少问题字段", i+1)
        }
        answer, ok := faq["answer"].(string)
        if !ok || answer == "" {
            return fmt.Errorf("第%d个FAQ缺少答案字段", i+1)
        }
        if len(question) > 200 {
            return fmt.Errorf("第%d个FAQ的问题长度不能超过200字符", i+1)
        }
        if len(answer) > 1000 {
            return fmt.Errorf("第%d个FAQ的答案长度不能超过1000字符", i+1)
        }
    }
    return nil
}

func getPublishTime(item map[string]interface{}) time.Time {
    if v, ok := item["publishDate"]; ok {
        if s, ok2 := v.(string); ok2 {
            if t, err := time.Parse(time.RFC3339, s); err == nil {
                return t
            }
        }
    }
    return time.Time{}
}

func GetAnnouncements() []map[string]interface{} {
    list := getJSONList(GetConsoleSetting().Announcements)
    sort.SliceStable(list, func(i, j int) bool {
        return getPublishTime(list[i]).After(getPublishTime(list[j]))
    })
    return list
}

func GetFAQ() []map[string]interface{} {
    return getJSONList(GetConsoleSetting().FAQ)
}

func validateUptimeKumaGroups(groupsStr string) error {
    groups, err := parseJSONArray(groupsStr, "Uptime Kuma分组配置")
    if err != nil {
        return err
    }

    if len(groups) > 20 {
        return fmt.Errorf("Uptime Kuma分组数量不能超过20个")
    }

    nameSet := make(map[string]bool)

    for i, group := range groups {
        categoryName, ok := group["categoryName"].(string)
        if !ok || categoryName == "" {
            return fmt.Errorf("第%d个分组缺少分类名称字段", i+1)
        }
        if nameSet[categoryName] {
            return fmt.Errorf("第%d个分组的分类名称与其他分组重复", i+1)
        }
        nameSet[categoryName] = true
        urlStr, ok := group["url"].(string)
        if !ok || urlStr == "" {
            return fmt.Errorf("第%d个分组缺少URL字段", i+1)
        }
        slug, ok := group["slug"].(string)
        if !ok || slug == "" {
            return fmt.Errorf("第%d个分组缺少Slug字段", i+1)
        }
        description, ok := group["description"].(string)
        if !ok {
            description = ""
        }

        if err := validateURL(urlStr, i+1, "分组"); err != nil {
            return err
        }

        if len(categoryName) > 50 {
            return fmt.Errorf("第%d个分组的分类名称长度不能超过50字符", i+1)
        }
        if len(urlStr) > 500 {
            return fmt.Errorf("第%d个分组的URL长度不能超过500字符", i+1)
        }
        if len(slug) > 100 {
            return fmt.Errorf("第%d个分组的Slug长度不能超过100字符", i+1)
        }
        if len(description) > 200 {
            return fmt.Errorf("第%d个分组的描述长度不能超过200字符", i+1)
        }

        if !slugRegex.MatchString(slug) {
            return fmt.Errorf("第%d个分组的Slug只能包含字母、数字、下划线和连字符", i+1)
        }

        if err := checkDangerousContent(description, i+1, "分组"); err != nil {
            return err
        }
        if err := checkDangerousContent(categoryName, i+1, "分组"); err != nil {
            return err
        }
    }
    return nil
}

func GetUptimeKumaGroups() []map[string]interface{} {
    return getJSONList(GetConsoleSetting().UptimeKumaGroups)
}