package handlers

import (
	"net/http"
	"strings"

	"simple_portal/models"

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

// SettingsGet renders the admin settings page.
func SettingsGet(c *gin.Context) {
	username, _ := c.Get("username")

	searchEngine, err := models.GetSetting(models.SettingKeySearchEngine)
	if err != nil {
		searchEngine = models.SearchEngineGoogle
	}
	if searchEngine == "" {
		searchEngine = models.SearchEngineGoogle
	}

	engines := map[string]string{
		"Google": models.SearchEngineGoogle,
		"Bing":   models.SearchEngineBing,
		"百度":    models.SearchEngineBaidu,
	}

	// Fetch homepage configuration
	homepageTitle, _ := models.GetSetting(models.SettingKeyHomepageTitle)
	if homepageTitle == "" {
		homepageTitle = models.DefaultHomepageTitle
	}

	homepageSubtitle, _ := models.GetSetting(models.SettingKeyHomepageSubtitle)
	homepageBackground, _ := models.GetSetting(models.SettingKeyHomepageBackground)

	c.HTML(http.StatusOK, "admin/settings.html", gin.H{
		"Title":              "设置",
		"Username":           username,
		"SearchEngine":       searchEngine,
		"Engines":            engines,
		"HomepageTitle":     homepageTitle,
		"HomepageSubtitle":  homepageSubtitle,
		"HomepageBackground": homepageBackground,
	})
}

// SettingsPost handles the settings form submission.
func SettingsPost(c *gin.Context) {
	username, _ := c.Get("username")

	searchEngine := c.PostForm("search_engine")
	customURL := c.PostForm("custom_url")

	// 如果用户填写了自定义URL，优先使用
	if customURL != "" {
		if !strings.Contains(customURL, "%s") {
			engines := map[string]string{
				"Google": models.SearchEngineGoogle,
				"Bing":   models.SearchEngineBing,
				"百度":    models.SearchEngineBaidu,
			}
			homepageTitle := c.PostForm("homepage_title")
			if homepageTitle == "" {
				homepageTitle = models.DefaultHomepageTitle
			}
			homepageSubtitle := c.PostForm("homepage_subtitle")
			homepageBackground := c.PostForm("homepage_background")

			c.HTML(http.StatusOK, "admin/settings.html", gin.H{
				"Title":              "设置",
				"Username":           username,
				"SearchEngine":       searchEngine,
				"Engines":            engines,
				"HomepageTitle":     homepageTitle,
				"HomepageSubtitle":  homepageSubtitle,
				"HomepageBackground": homepageBackground,
				"Error":              "自定义 URL 必须包含 %s 作为搜索词占位符",
			})
			return
		}
		searchEngine = customURL
	}

	if searchEngine == "" {
		searchEngine = models.SearchEngineGoogle
	}

	// Save search engine setting
	if err := models.SetSetting(models.SettingKeySearchEngine, searchEngine); err != nil {
		engines := map[string]string{
			"Google": models.SearchEngineGoogle,
			"Bing":   models.SearchEngineBing,
			"百度":    models.SearchEngineBaidu,
		}
		homepageTitle := c.PostForm("homepage_title")
		if homepageTitle == "" {
			homepageTitle = models.DefaultHomepageTitle
		}
		homepageSubtitle := c.PostForm("homepage_subtitle")
		homepageBackground := c.PostForm("homepage_background")

		c.HTML(http.StatusOK, "admin/settings.html", gin.H{
			"Title":              "设置",
			"Username":           username,
			"SearchEngine":       searchEngine,
			"Engines":            engines,
			"HomepageTitle":     homepageTitle,
			"HomepageSubtitle":  homepageSubtitle,
			"HomepageBackground": homepageBackground,
			"Error":              "保存失败，请重试",
		})
		return
	}

	// Save homepage settings
	homepageTitle := c.PostForm("homepage_title")
	if homepageTitle == "" {
		homepageTitle = models.DefaultHomepageTitle
	}
	homepageSubtitle := c.PostForm("homepage_subtitle")
	homepageBackground := c.PostForm("homepage_background")

	if err := models.SetSetting(models.SettingKeyHomepageTitle, homepageTitle); err != nil {
		c.Redirect(http.StatusFound, "/admin/settings")
		return
	}
	if err := models.SetSetting(models.SettingKeyHomepageSubtitle, homepageSubtitle); err != nil {
		c.Redirect(http.StatusFound, "/admin/settings")
		return
	}
	if err := models.SetSetting(models.SettingKeyHomepageBackground, homepageBackground); err != nil {
		c.Redirect(http.StatusFound, "/admin/settings")
		return
	}

	// 保存成功后重定向，利用 PRG 模式
	c.Redirect(http.StatusFound, "/admin/settings")
}