package handlers

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

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

type CategoryHandler struct {
	service *services.CategoryService
}

func NewCategoryHandler(service *services.CategoryService) *CategoryHandler {
	return &CategoryHandler{service: service}
}

// GetAllCategories godoc
// @Summary Get all active categories
// @Description Get list of all active categories (public endpoint)
// @Tags categories
// @Accept json
// @Produce json
// @Success 200 {array} models.Category
// @Router /api/v1/categories [get]
func (h *CategoryHandler) GetAllCategories(c *gin.Context) {
	categories, err := h.service.GetAllCategories(true)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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

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

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

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

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

// AdminGetAllCategories godoc
// @Summary Get all categories (Admin)
// @Description Get list of all categories including inactive ones
// @Tags admin,categories
// @Accept json
// @Produce json
// @Security BearerAuth
// @Success 200 {array} models.Category
// @Router /api/v1/admin/categories [get]
func (h *CategoryHandler) AdminGetAllCategories(c *gin.Context) {
	categories, err := h.service.GetAllCategories(false)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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

// GetCategoryByID godoc
// @Summary Get category by ID (Admin)
// @Description Get a single category by ID
// @Tags admin,categories
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "Category ID"
// @Success 200 {object} models.Category
// @Router /api/v1/admin/categories/{id} [get]
func (h *CategoryHandler) GetCategoryByID(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 category ID"})
		return
	}

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

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

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

// CreateCategory godoc
// @Summary Create a new category (Admin)
// @Description Create a new category
// @Tags admin,categories
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param category body models.Category true "Category object"
// @Success 201 {object} models.Category
// @Router /api/v1/admin/categories [post]
func (h *CategoryHandler) CreateCategory(c *gin.Context) {
	var input struct {
		Title    string  `json:"title" binding:"required"`
		Keywords string  `json:"keywords"`
		Desc     string  `json:"description"`
		IsActive *bool   `json:"is_active"`
		Order    *int    `json:"order"`
		Slug     string  `json:"slug"`
		ParentID *uint64 `json:"parent_id"`
		Image    string  `json:"image"`
	}

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

	category := &models.Category{
		Title:    input.Title,
		Keywords: input.Keywords,
		Desc:     input.Desc,
		Slug:     input.Slug,
		ParentID: input.ParentID,
		Image:    input.Image,
	}

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

	if input.Order != nil {
		category.Order = *input.Order
	} else {
		category.Order = 1
	}

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

	c.JSON(http.StatusCreated, gin.H{"data": category})
}

// UpdateCategory godoc
// @Summary Update a category (Admin)
// @Description Update an existing category
// @Tags admin,categories
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "Category ID"
// @Param category body models.Category true "Category object"
// @Success 200 {object} models.Category
// @Router /api/v1/admin/categories/{id} [put]
func (h *CategoryHandler) UpdateCategory(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 category 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.UpdateCategory(id, input); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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

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

// DeleteCategory godoc
// @Summary Delete a category (Admin)
// @Description Delete a category by ID
// @Tags admin,categories
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "Category ID"
// @Success 200 {object} map[string]string
// @Router /api/v1/admin/categories/{id} [delete]
func (h *CategoryHandler) DeleteCategory(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 category ID"})
		return
	}

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

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