package api

import (
	"fmt"
	"net/http"
	"net/url"
	"strings"

	"home-vue-go/internal/config"
	"home-vue-go/internal/database"

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

type updateSiteConfigRequest struct {
	SiteName        *string `json:"siteName"`
	SiteURL         *string `json:"siteURL"`
	SiteIcon        *string `json:"siteIcon"`
	SiteDescription *string `json:"siteDescription"`
	SiteKeywords    *string `json:"siteKeywords"`
	UserName        *string `json:"userName"`
	ProfileImageURL *string `json:"profileImageURL"`
	ICPNumber       *string `json:"icpNumber"`
	PoliceNumber    *string `json:"policeNumber"`
	PageTitle       *string `json:"pageTitle"`
	Favicon         *string `json:"favicon"`
	IconLibrary     *string `json:"iconLibrary"`
	FontLibrary     *string `json:"fontLibrary"`

	FooterYearStart *string   `json:"footerYearStart"`
	FooterYearEnd   *string   `json:"footerYearEnd"`
	ShowVisitTimer  *bool     `json:"showVisitTimer"`
	RotatingTexts   *[]string `json:"rotatingTexts"`

	GreetingText     *string             `json:"greetingText"`
	OnlineStatusText *string             `json:"onlineStatusText"`
	FooterLabel      *string             `json:"footerLabel"`
	ShowAbout        *bool               `json:"showAbout"`
	ShowSites        *bool               `json:"showSites"`
	ShowContacts     *bool               `json:"showContacts"`
	ShowThemeToggle  *bool               `json:"showThemeToggle"`
	ShowFooter       *bool               `json:"showFooter"`
	AboutTitle       *string             `json:"aboutTitle"`
	AboutDescription *string             `json:"aboutDescription"`
	AboutLinks       *[]config.AboutLink `json:"aboutLinks"`
	SitePageSize     *int                `json:"sitePageSize"`
	OpenLinksNewTab  *bool               `json:"openLinksInNewTab"`

	AnalyticsProvider    *string `json:"analyticsProvider"`
	UmamiScript          *string `json:"umamiScript"`
	UmamiScriptURL       *string `json:"umamiScriptUrl"`
	UmamiWebsiteID       *string `json:"umamiWebsiteId"`
	UmamiAPIMode         *string `json:"umamiApiMode"`
	UmamiAPIURL          *string `json:"umamiApiUrl"`
	UmamiCredential      *string `json:"umamiCredential"`
	ClearUmamiCredential *bool   `json:"clearUmamiCredential"`
	UmamiDomains         *string `json:"umamiDomains"`
	UmamiDoNotTrack      *bool   `json:"umamiDoNotTrack"`
	UmamiExcludeSearch   *bool   `json:"umamiExcludeSearch"`
	UmamiExcludeHash     *bool   `json:"umamiExcludeHash"`
	UmamiPerformance     *bool   `json:"umamiPerformance"`
	UmamiTag             *string `json:"umamiTag"`
	UmamiTrackerOptions  *struct {
		Domains       *string `json:"domains"`
		DoNotTrack    *bool   `json:"doNotTrack"`
		ExcludeSearch *bool   `json:"excludeSearch"`
		ExcludeHash   *bool   `json:"excludeHash"`
		Performance   *bool   `json:"performance"`
		Tag           *string `json:"tag"`
	} `json:"umamiTrackerOptions"`
}

func GetSiteConfig(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		settings, err := db.LoadSiteSettings(c.Request.Context())
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "加载站点配置失败"})
			return
		}
		c.JSON(http.StatusOK, siteConfigResponse(settings, false))
	}
}

func GetAdminSiteConfig(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		settings, err := db.LoadSiteSettings(c.Request.Context())
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "加载站点配置失败"})
			return
		}
		c.JSON(http.StatusOK, siteConfigResponse(settings, true))
	}
}

func UpdateSiteConfig(db *database.Database, cfg *config.Config) gin.HandlerFunc {
	return func(c *gin.Context) {
		var req updateSiteConfigRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "配置参数格式错误"})
			return
		}

		ctx := c.Request.Context()
		settings, err := db.LoadSiteSettings(ctx)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "加载现有站点配置失败"})
			return
		}
		next := settings.Clone()
		applyString(&next.SiteName, req.SiteName)
		applyString(&next.SiteURL, req.SiteURL)
		applyString(&next.SiteIcon, req.SiteIcon)
		applyString(&next.SiteDescription, req.SiteDescription)
		applyString(&next.SiteKeywords, req.SiteKeywords)
		applyString(&next.UserName, req.UserName)
		applyString(&next.ProfileImageURL, req.ProfileImageURL)
		applyString(&next.ICPNumber, req.ICPNumber)
		applyString(&next.PoliceNumber, req.PoliceNumber)
		applyString(&next.PageTitle, req.PageTitle)
		applyString(&next.Favicon, req.Favicon)
		applyString(&next.IconLibrary, req.IconLibrary)
		applyString(&next.FontLibrary, req.FontLibrary)
		applyString(&next.FooterYearStart, req.FooterYearStart)
		applyString(&next.FooterYearEnd, req.FooterYearEnd)
		applyBool(&next.ShowVisitTimer, req.ShowVisitTimer)
		applySlice(&next.RotatingTexts, req.RotatingTexts)
		applyString(&next.GreetingText, req.GreetingText)
		applyString(&next.OnlineStatusText, req.OnlineStatusText)
		applyString(&next.FooterLabel, req.FooterLabel)
		applyBool(&next.ShowAbout, req.ShowAbout)
		applyBool(&next.ShowSites, req.ShowSites)
		applyBool(&next.ShowContacts, req.ShowContacts)
		applyBool(&next.ShowThemeToggle, req.ShowThemeToggle)
		applyBool(&next.ShowFooter, req.ShowFooter)
		applyString(&next.AboutTitle, req.AboutTitle)
		applyString(&next.AboutDescription, req.AboutDescription)
		applySlice(&next.AboutLinks, req.AboutLinks)
		applyInt(&next.SitePageSize, req.SitePageSize)
		applyBool(&next.OpenLinksNewTab, req.OpenLinksNewTab)
		applyString(&next.AnalyticsProvider, req.AnalyticsProvider)
		applyString(&next.UmamiScript, req.UmamiScript)
		applyString(&next.UmamiScript, req.UmamiScriptURL)
		applyString(&next.UmamiWebsiteID, req.UmamiWebsiteID)
		applyString(&next.UmamiAPIMode, req.UmamiAPIMode)
		applyString(&next.UmamiAPIURL, req.UmamiAPIURL)
		applyString(&next.UmamiDomains, req.UmamiDomains)
		applyBool(&next.UmamiDoNotTrack, req.UmamiDoNotTrack)
		applyBool(&next.UmamiExcludeSearch, req.UmamiExcludeSearch)
		applyBool(&next.UmamiExcludeHash, req.UmamiExcludeHash)
		applyBool(&next.UmamiPerformance, req.UmamiPerformance)
		applyString(&next.UmamiTag, req.UmamiTag)
		if options := req.UmamiTrackerOptions; options != nil {
			applyString(&next.UmamiDomains, options.Domains)
			applyBool(&next.UmamiDoNotTrack, options.DoNotTrack)
			applyBool(&next.UmamiExcludeSearch, options.ExcludeSearch)
			applyBool(&next.UmamiExcludeHash, options.ExcludeHash)
			applyBool(&next.UmamiPerformance, options.Performance)
			applyString(&next.UmamiTag, options.Tag)
		}

		if req.ClearUmamiCredential != nil && *req.ClearUmamiCredential {
			next.UmamiCredential = ""
		} else if req.UmamiCredential != nil {
			if strings.TrimSpace(*req.UmamiCredential) == "" {
				next.UmamiCredential = ""
			} else {
				if cfg == nil {
					c.JSON(http.StatusInternalServerError, gin.H{"error": "加密配置不可用"})
					return
				}
				encrypted, err := cfg.EncryptSecret(strings.TrimSpace(*req.UmamiCredential))
				if err != nil {
					c.JSON(http.StatusInternalServerError, gin.H{"error": "保存统计凭据失败"})
					return
				}
				next.UmamiCredential = encrypted
			}
		}

		if err := validateSiteSettings(next); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		if err := db.SaveSiteSettings(ctx, next); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点配置失败"})
			return
		}
		c.JSON(http.StatusOK, siteConfigResponse(next, true))
	}
}

func GetRotatingTexts(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		settings, err := db.LoadSiteSettings(c.Request.Context())
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "加载轮换文本配置失败"})
			return
		}
		c.JSON(http.StatusOK, gin.H{"texts": settings.RotatingTexts})
	}
}

func UpdateRotatingTexts(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		var req struct {
			Texts []string `json:"texts"`
		}
		if err := c.ShouldBindJSON(&req); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "轮换文本参数格式错误"})
			return
		}
		settings, err := db.LoadSiteSettings(c.Request.Context())
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "加载站点配置失败"})
			return
		}
		settings.RotatingTexts = req.Texts
		settings.Normalize()
		if err := db.SaveSiteSettings(c.Request.Context(), settings); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存轮换文本配置失败"})
			return
		}
		c.JSON(http.StatusOK, gin.H{"message": "轮换文本配置已保存", "texts": settings.RotatingTexts})
	}
}

func siteConfigResponse(settings *config.SiteSettings, admin bool) gin.H {
	result := gin.H{
		"siteName": settings.SiteName, "siteURL": settings.SiteURL, "siteIcon": settings.SiteIcon,
		"siteDescription": settings.SiteDescription, "siteKeywords": settings.SiteKeywords, "userName": settings.UserName,
		"profileImageURL": settings.ProfileImageURL, "icpNumber": settings.ICPNumber, "policeNumber": settings.PoliceNumber,
		"pageTitle": settings.PageTitle, "favicon": settings.Favicon, "iconLibrary": settings.IconLibrary, "fontLibrary": settings.FontLibrary,
		"footerYearStart": settings.FooterYearStart, "footerYearEnd": settings.FooterYearEnd, "showVisitTimer": settings.ShowVisitTimer,
		"rotatingTexts": settings.RotatingTexts, "greetingText": settings.GreetingText, "onlineStatusText": settings.OnlineStatusText,
		"footerLabel": settings.FooterLabel, "showAbout": settings.ShowAbout, "showSites": settings.ShowSites, "showContacts": settings.ShowContacts,
		"showThemeToggle": settings.ShowThemeToggle, "showFooter": settings.ShowFooter, "aboutTitle": settings.AboutTitle,
		"aboutDescription": settings.AboutDescription, "aboutLinks": settings.AboutLinks, "sitePageSize": settings.SitePageSize,
		"openLinksInNewTab": settings.OpenLinksNewTab, "analyticsProvider": settings.AnalyticsProvider, "umamiScript": settings.UmamiScript, "umamiScriptUrl": settings.UmamiScript,
		"umamiWebsiteId": settings.UmamiWebsiteID, "umamiDomains": settings.UmamiDomains, "umamiDoNotTrack": settings.UmamiDoNotTrack,
		"umamiExcludeSearch": settings.UmamiExcludeSearch, "umamiExcludeHash": settings.UmamiExcludeHash,
		"umamiPerformance": settings.UmamiPerformance, "umamiTag": settings.UmamiTag,
		"umamiTrackerOptions": gin.H{"domains": settings.UmamiDomains, "doNotTrack": settings.UmamiDoNotTrack, "excludeSearch": settings.UmamiExcludeSearch, "excludeHash": settings.UmamiExcludeHash, "performance": settings.UmamiPerformance, "tag": settings.UmamiTag},
	}
	if admin {
		result["umamiApiMode"] = settings.UmamiAPIMode
		result["umamiApiUrl"] = settings.UmamiAPIURL
		result["umamiCredentialConfigured"] = settings.UmamiCredential != ""
	}
	return result
}

func validateSiteSettings(settings *config.SiteSettings) error {
	for name, value := range map[string]string{"站点URL": settings.SiteURL, "Umami脚本地址": settings.UmamiScript, "Umami API地址": settings.UmamiAPIURL} {
		if value == "" {
			continue
		}
		parsed, err := url.ParseRequestURI(value)
		if err != nil || (parsed.Scheme != "http" && parsed.Scheme != "https") || parsed.Host == "" {
			return fmt.Errorf("%s必须是有效的 http/https 地址", name)
		}
	}
	if settings.SitePageSize != 6 && settings.SitePageSize != 9 && settings.SitePageSize != 12 {
		return fmt.Errorf("站点每页数量只能是 6、9 或 12")
	}
	if settings.AnalyticsProvider != "local" && settings.AnalyticsProvider != "umami" {
		return fmt.Errorf("统计来源只能是 local 或 umami")
	}
	if settings.UmamiAPIMode != "selfhost" && settings.UmamiAPIMode != "cloud" {
		return fmt.Errorf("Umami API 模式不正确")
	}
	if len(settings.AboutLinks) > 8 {
		return fmt.Errorf("关于链接最多支持 8 条")
	}
	for _, link := range settings.AboutLinks {
		if strings.TrimSpace(link.URL) == "" {
			return fmt.Errorf("关于链接地址不能为空")
		}
		parsed, err := url.ParseRequestURI(link.URL)
		if err != nil || (parsed.Scheme != "http" && parsed.Scheme != "https") || parsed.Host == "" {
			return fmt.Errorf("关于链接必须是有效的 http/https 地址")
		}
	}
	return nil
}

func applyString(target *string, value *string) {
	if value != nil {
		*target = strings.TrimSpace(*value)
	}
}
func applyBool(target *bool, value *bool) {
	if value != nil {
		*target = *value
	}
}
func applyInt(target *int, value *int) {
	if value != nil {
		*target = *value
	}
}
func applySlice[T any](target *[]T, value *[]T) {
	if value != nil {
		*target = *value
	}
}