package handlers

import (
	"gobeyhan/app/blog/services"
	"gobeyhan/database/models"
	"net/http"
	"strconv"

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

type PostHandler struct {
	service *services.PostService
}

func NewPostHandler(service *services.PostService) *PostHandler {
	return &PostHandler{service: service}
}

// GetAllPosts godoc
// @Summary Get all active posts
// @Description Get paginated list of active posts (public endpoint)
// @Tags posts
// @Accept json
// @Produce json
// @Param page query int false "Page number" default(1)
// @Param limit query int false "Items per page" default(10)
// @Success 200 {object} map[string]interface{}
// @Router /api/v1/posts [get]
func (h *PostHandler) GetAllPosts(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "10"))

	if page < 1 {
		page = 1
	}
	if limit < 1 || limit > 100 {
		limit = 10
	}

	posts, total, err := h.service.GetAllPosts(page, limit, true)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data":  posts,
		"total": total,
		"page":  page,
		"limit": limit,
	})
}

// GetPostBySlug godoc
// @Summary Get post by slug
// @Description Get a single post by its slug (public endpoint)
// @Tags posts
// @Accept json
// @Produce json
// @Param slug path string true "Post Slug"
// @Success 200 {object} models.Post
// @Router /api/v1/posts/{slug} [get]
func (h *PostHandler) GetPostBySlug(c *gin.Context) {
	slug := c.Param("slug")

	post, err := h.service.GetPostBySlug(slug)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	if post == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Post not found"})
		return
	}

	c.JSON(http.StatusOK, gin.H{"data": post})
}

// AdminGetAllPosts godoc
// @Summary Get all posts (Admin)
// @Description Get paginated list of all posts including inactive
// @Tags admin,posts
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param page query int false "Page number" default(1)
// @Param limit query int false "Items per page" default(10)
// @Success 200 {object} map[string]interface{}
// @Router /api/v1/admin/posts [get]
func (h *PostHandler) AdminGetAllPosts(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "10"))

	if page < 1 {
		page = 1
	}
	if limit < 1 || limit > 100 {
		limit = 10
	}

	posts, total, err := h.service.GetAllPosts(page, limit, false)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data":  posts,
		"total": total,
		"page":  page,
		"limit": limit,
	})
}

// GetPostByID godoc
// @Summary Get post by ID (Admin)
// @Description Get a single post by ID
// @Tags admin,posts
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "Post ID"
// @Success 200 {object} models.Post
// @Router /api/v1/admin/posts/{id} [get]
func (h *PostHandler) GetPostByID(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid post ID"})
		return
	}

	post, err := h.service.GetPostByID(id)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	if post == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Post not found"})
		return
	}

	c.JSON(http.StatusOK, gin.H{"data": post})
}

// CreatePost godoc
// @Summary Create a new post (Admin)
// @Description Create a new post
// @Tags admin,posts
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param post body models.Post true "Post object"
// @Success 201 {object} models.Post
// @Router /api/v1/admin/posts [post]
func (h *PostHandler) CreatePost(c *gin.Context) {
	var input struct {
		Title      string   `json:"title" binding:"required"`
		UserID     *uint64  `json:"user_id"`
		Content    string   `json:"content"`
		Keywords   string   `json:"keywords"`
		Image      string   `json:"image"`
		Thumb      string   `json:"thumb"`
		Video      string   `json:"video"`
		Slug       string   `json:"slug"`
		IsActive   *bool    `json:"is_active"`
		IsFront    *bool    `json:"is_front"`
		ParentID   *uint64  `json:"parent_id"`
		Categories []uint64 `json:"categories"`
		Tags       []uint64 `json:"tags"`
	}

	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	post := &models.Post{
		Title:    input.Title,
		UserID:   input.UserID,
		Content:  input.Content,
		Keywords: input.Keywords,
		Image:    input.Image,
		Thumb:    input.Thumb,
		Video:    input.Video,
		Slug:     input.Slug,
		ParentID: input.ParentID,
	}

	if input.IsActive != nil {
		post.IsActive = *input.IsActive
	} else {
		post.IsActive = true
	}

	if input.IsFront != nil {
		post.IsFront = *input.IsFront
	} else {
		post.IsFront = true
	}

	// Create post first
	if err := h.service.CreatePost(post); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// Add categories and tags if provided
	if len(input.Categories) > 0 || len(input.Tags) > 0 {
		updates := make(map[string]interface{})

		if len(input.Categories) > 0 {
			var categories []*models.Category
			for _, catID := range input.Categories {
				categories = append(categories, &models.Category{ID: catID})
			}
			updates["categories"] = categories
		}

		if len(input.Tags) > 0 {
			var tags []*models.Tag
			for _, tagID := range input.Tags {
				tags = append(tags, &models.Tag{ID: tagID})
			}
			updates["tags"] = tags
		}

		if err := h.service.UpdatePost(post.ID, updates); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}
	}

	// Fetch created post with relationships
	createdPost, _ := h.service.GetPostByID(post.ID)
	c.JSON(http.StatusCreated, gin.H{"data": createdPost})
}

// UpdatePost godoc
// @Summary Update a post (Admin)
// @Description Update an existing post
// @Tags admin,posts
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "Post ID"
// @Param post body models.Post true "Post object"
// @Success 200 {object} models.Post
// @Router /api/v1/admin/posts/{id} [put]
func (h *PostHandler) UpdatePost(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid post ID"})
		return
	}

	var input map[string]interface{}
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if err := h.service.UpdatePost(id, input); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// Fetch updated post
	post, err := h.service.GetPostByID(id)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"data": post})
}

// DeletePost godoc
// @Summary Delete a post (Admin)
// @Description Delete a post by ID
// @Tags admin,posts
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "Post ID"
// @Success 200 {object} map[string]string
// @Router /api/v1/admin/posts/{id} [delete]
func (h *PostHandler) DeletePost(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid post ID"})
		return
	}

	if err := h.service.DeletePost(id); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "Post deleted successfully"})
}