// item_handlers.go
package main

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"

	"github.com/gorilla/mux"
)

func GetItemsHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	log.Info("Received %s request to %s", r.Method, r.URL)

	var items []Item
	// Preload tags when getting items
	if err := db.Preload("Tags").Find(&items).Error; err != nil {
		log.Error("Failed to fetch items: %v", err)
		http.Error(w, "Failed to fetch items", http.StatusInternalServerError)
		return
	}
	json.NewEncoder(w).Encode(items)
}

func CreateItemHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	var item Item

	err := json.NewDecoder(r.Body).Decode(&item)
	if err != nil {
		log.Error("Failed to decode item creation request: %v", err)
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}
	log.Info("Creating new item: %s", item.Name)

	db.Create(&item)

	type createItemResponse struct {
		ID   uint   `json:"id"`
		Name string `json:"name"`
	}

	response := createItemResponse{
		ID:   item.ID,
		Name: item.Name,
	}

	log.DatabaseAction("create", fmt.Sprintf("Created item with ID %d", item.ID))
	json.NewEncoder(w).Encode(response)
}

func UploadItemImageHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	user, ok := r.Context().Value(userKey).(string)
	if !ok || user == "" {
		log.Warn("Unauthorized image upload attempt")
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	err := r.ParseMultipartForm(10 << 20)
	if err != nil {
		log.Error("Failed to parse multipart form: %v", err)
		http.Error(w, "Unable to parse form", http.StatusBadRequest)
		return
	}

	file, handler, err := r.FormFile("image")
	if err != nil {
		log.Error("Error retrieving file from form: %v", err)
		http.Error(w, "Error retrieving the file", http.StatusBadRequest)
		return
	}
	defer file.Close()

	vars := mux.Vars(r)
	itemID := vars["id"]

	var item Item
	if err := db.First(&item, itemID).Error; err != nil {
		log.Warn("Attempt to upload image for non-existent item with ID: %s", itemID)
		http.Error(w, "Item not found", http.StatusNotFound)
		return
	}

	if err := os.MkdirAll(*ImageStorage, 0755); err != nil {
		log.Error("Failed to create image storage directory: %v", err)
		http.Error(w, "Unable to create image storage directory", http.StatusInternalServerError)
		return
	}

	filePath := fmt.Sprintf("%s/%s", *ImageStorage, handler.Filename)
	outFile, err := os.Create(filePath)
	if err != nil {
		log.Error("Failed to create file: %v", err)
		http.Error(w, "Unable to save the file", http.StatusInternalServerError)
		return
	}
	defer outFile.Close()

	_, err = io.Copy(outFile, file)
	if err != nil {
		log.Error("Failed to save file: %v", err)
		http.Error(w, "Unable to save the file", http.StatusInternalServerError)
		return
	}

	item.ImagePath = filePath
	if err := db.Save(&item).Error; err != nil {
		log.Error("Failed to update item with image path: %v", err)
		http.Error(w, "Unable to save image path in database", http.StatusInternalServerError)
		return
	}

	log.Info("Image uploaded successfully for item %s by user %s", itemID, user)
	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(map[string]string{"imagePath": filePath})
}

func GetItemImageHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	vars := mux.Vars(r)
	itemID := vars["id"]

	var item Item
	if err := db.First(&item, itemID).Error; err != nil {
		log.Info("Item not found, using default image for ID: %s", itemID)
		item.ImagePath = "images/default.jpg"
	} else if item.ImagePath == "" {
		item.ImagePath = "images/default.jpg"
	}

	imageFile, err := os.Open(item.ImagePath)
	if err != nil {
		log.Error("Error opening image file: %v", err)
		item.ImagePath = "images/default.jpg"
		return
	}
	defer imageFile.Close()

	imageData, err := io.ReadAll(imageFile)
	if err != nil {
		log.Error("Error reading image file: %v", err)
		item.ImagePath = "images/default.jpg"
		return
	}
	contentType := http.DetectContentType(imageData)

	w.Header().Set("Content-Type", contentType)
	w.Write(imageData)
}

func SearchItemsHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	query := r.URL.Query().Get("q")
	if query == "" {
		log.Warn("Search attempt with empty query")
		http.Error(w, "Search query is required", http.StatusBadRequest)
		return
	}

	log.Info("Searching for items with query: %s", query)
	var items []Item
	db.Where("name GLOB ? OR description GLOB ?", "*"+query+"*", "*"+query+"*").Find(&items)
	json.NewEncoder(w).Encode(items)
}

func GetItemHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	vars := mux.Vars(r)
	id := vars["id"]

	var item Item
	if err := db.Preload("Tags").First(&item, id).Error; err != nil {
		log.Warn("Item not found with ID: %s", id)
		http.Error(w, "Item not found", http.StatusNotFound)
		return
	}

	json.NewEncoder(w).Encode(item)
}

func GetItemsInBoxHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	vars := mux.Vars(r)
	id := vars["id"]

	var items []Item
	if err := db.Preload("Tags").Where("box_id = ?", id).Find(&items).Error; err != nil {
		log.Warn("Failed to fetch items for box ID: %s", id)
		http.Error(w, "Items not found", http.StatusNotFound)
		return
	}

	log.Info("Retrieved %d items from box %s", len(items), id)
	json.NewEncoder(w).Encode(items)
}

func UpdateItemHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	vars := mux.Vars(r)
	id := vars["id"]

	var item Item
	if err := db.First(&item, id).Error; err != nil {
		log.Warn("Attempt to update non-existent item with ID: %s", id)
		http.Error(w, "Item not found", http.StatusNotFound)
		return
	}

	err := json.NewDecoder(r.Body).Decode(&item)
	if err != nil {
		log.Error("Failed to decode item update request: %v", err)
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	log.DatabaseAction("update", fmt.Sprintf("Updated item with ID %s", id))
	db.Save(&item)
	json.NewEncoder(w).Encode(item)
}

func DeleteItemHandler(w http.ResponseWriter, r *http.Request) {
	log := GetLogger()
	vars := mux.Vars(r)
	id := vars["id"]

	var item Item
	if err := db.First(&item, id).Error; err != nil {
		log.Warn("Attempt to delete non-existent item with ID: %s", id)
		http.Error(w, "Item not found", http.StatusNotFound)
		return
	}

	log.DatabaseAction("delete", fmt.Sprintf("Deleted item with ID %s", id))
	db.Delete(&item)
	w.WriteHeader(http.StatusNoContent)
}