package themes_handler

import (
	"fmt"
	"log"
	"net/http"
	"strconv"
	"strings"

	"autolibrary.top/webserver/backend/models/themes_model"

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

func (h *Handler) GetFeaturedThemes(c *gin.Context) {
	limitStr := c.Query("limit")
	limit := 6
	if limitStr != "" {
		if v, err := strconv.Atoi(limitStr); err == nil && v > 0 && v <= 20 {
			limit = v
		}
	}

	var themes []themes_model.Theme
	result := h.DB.
		Where("status = ?", themes_model.ThemeApproved).
		Order("download_count DESC").
		Limit(limit).
		Find(&themes)
	if result.Error != nil {
		log.Printf("[E] GET > occur an error when get featured themes: %v", result.Error)
		c.JSON(http.StatusInternalServerError, gin.H{
			"code": http.StatusInternalServerError,
			"msg":  "GET > occur an error when get featured themes",
			"data": nil,
		})
		return
	}

	for i := range themes {
		themes[i].Author = h.Users.ResolveAuthor(themes[i].UserID, themes[i].Author)
		themes[i].Verified = h.Users.IsVerified(themes[i].UserID)
	}

	log.Printf("[I] GET > get featured themes (limit=%d) successful", limit)
	c.JSON(http.StatusOK, gin.H{
		"code": http.StatusOK,
		"msg":  "GET > get featured themes successful",
		"data": themes,
	})
}

// GET /api/themes?page=1&per_page=9&need_theme=&tags=&search=&sort=popular

func (h *Handler) GetThemes(c *gin.Context) {
	pageStr := c.Query("page")
	perPageStr := c.Query("per_page")
	needTheme := c.Query("need_theme")
	tagsStr := c.Query("tags")
	search := c.Query("search")
	sort := c.Query("sort")

	if pageStr == "" {
		pageStr = "1"
	}
	if perPageStr == "" {
		perPageStr = "9"
	}
	if sort == "" {
		sort = "popular"
	}

	page, err := strconv.Atoi(pageStr)
	if err != nil || page <= 0 {
		page = 1
	}
	perPage, err := strconv.Atoi(perPageStr)
	if err != nil || perPage <= 0 || perPage > 50 {
		perPage = 9
	}

	offset := (page - 1) * perPage

	query := h.DB.Where("status = ?", themes_model.ThemeApproved)

	if needTheme != "" {
		if needTheme == "both" {
			query = query.Where("need_theme = ?", "both")
		} else if needTheme == "dark" || needTheme == "light" {
			query = query.Where("need_theme = ? OR need_theme = ?", needTheme, "both")
		}
	}

	if tagsStr != "" {
		tags := strings.Split(tagsStr, ",")
		for _, tag := range tags {
			tag = strings.TrimSpace(tag)
			if tag != "" {
				query = query.Where("tags LIKE ?", fmt.Sprintf("%%%s%%", tag))
			}
		}
	}

	if search != "" {
		like := fmt.Sprintf("%%%s%%", search)
		query = query.Where("name LIKE ? OR brief LIKE ? OR author LIKE ?", like, like, like)
	}

	switch sort {
	case "newest":
		query = query.Order("created_at DESC")
	case "name":
		query = query.Order("name ASC")
	default: // popular
		query = query.Order("download_count DESC")
	}

	var total int64
	if result := query.Model(&themes_model.Theme{}).Count(&total); result.Error != nil {
		log.Printf("[E] GET > occur an error when count themes: %v", result.Error)
		c.JSON(http.StatusInternalServerError, gin.H{
			"code": http.StatusInternalServerError,
			"msg":  "GET > occur an error when get themes",
			"data": nil,
		})
		return
	}

	var themes []themes_model.Theme
	result := query.Limit(perPage).Offset(offset).Find(&themes)
	if result.Error != nil {
		log.Printf("[E] GET > occur an error when get themes (page=%d, per_page=%d): %v", page, perPage, result.Error)
		c.JSON(http.StatusInternalServerError, gin.H{
			"code": http.StatusInternalServerError,
			"msg":  "GET > occur an error when get themes",
			"data": nil,
		})
		return
	}

	for i := range themes {
		themes[i].Author = h.Users.ResolveAuthor(themes[i].UserID, themes[i].Author)
		themes[i].Verified = h.Users.IsVerified(themes[i].UserID)
	}

	totalPages := int(total) / perPage
	if int(total)%perPage != 0 {
		totalPages++
	}

	log.Printf("[I] GET > get themes (page=%d, per_page=%d, total=%d) successful", page, perPage, total)
	c.JSON(http.StatusOK, gin.H{
		"code": http.StatusOK,
		"msg":  "GET > get themes successful",
		"data": gin.H{
			"themes": themes,
			"meta": gin.H{
				"page":        page,
				"per_page":    perPage,
				"total":       total,
				"total_pages": totalPages,
				"has_next":    page < totalPages,
			},
		},
	})
}

// GET /api/themes/:id

func (h *Handler) GetThemeByID(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		log.Printf("[E] GET > try to get theme, but got invalid id: '%s'", c.Param("id"))
		c.JSON(http.StatusBadRequest, gin.H{
			"code": http.StatusBadRequest,
			"msg":  "GET > invalid id",
			"data": nil,
		})
		return
	}

	var theme themes_model.Theme
	result := h.DB.Where("status = ?", themes_model.ThemeApproved).First(&theme, id)
	if result.Error != nil {
		log.Printf("[E] GET > theme (id=%d) can not found: %v", id, result.Error)
		c.JSON(http.StatusNotFound, gin.H{
			"code": http.StatusNotFound,
			"msg":  "GET > theme not found",
			"data": nil,
		})
		return
	}

	theme.Author = h.Users.ResolveAuthor(theme.UserID, theme.Author)
	theme.Verified = h.Users.IsVerified(theme.UserID)

	log.Printf("[I] GET > get theme (id=%d) successful", id)
	c.JSON(http.StatusOK, gin.H{
		"code": http.StatusOK,
		"msg":  "GET > get theme successful",
		"data": theme,
	})
}

// GET /api/themes/:id/download

func (h *Handler) GetUserThemes(c *gin.Context) {
	userID, _ := c.Get("user_id")

	var themes []themes_model.Theme
	result := h.DB.
		Where("user_id = ?", userID.(string)).
		Order("created_at DESC").
		Find(&themes)
	if result.Error != nil {
		log.Printf("[E] GET > occur an error when get user themes: %v", result.Error)
		c.JSON(http.StatusInternalServerError, gin.H{"code": http.StatusInternalServerError, "msg": "获取用户主题失败", "data": nil})
		return
	}

	for i := range themes {
		themes[i].Author = h.Users.ResolveAuthor(themes[i].UserID, themes[i].Author)
		themes[i].Verified = h.Users.IsVerified(themes[i].UserID)
	}

	log.Printf("[I] GET > get user themes (user_id=%s, count=%d) successful", userID.(string), len(themes))
	c.JSON(http.StatusOK, gin.H{"code": http.StatusOK, "msg": "GET > get user themes successful", "data": themes})
}