package posts

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"strconv"

	"git.schreifuchs.ch/schreifuchs/ng-blog/backend/internal/auth"
	"git.schreifuchs.ch/schreifuchs/ng-blog/backend/internal/model"
	"github.com/gorilla/mux"
)

// SavePost handles saving a new post to the database after extracting user claims and decoding the request body.
func (s Service) SavePost(w http.ResponseWriter, r *http.Request) {
	claims, ok := auth.ExtractClaims(r.Context())
	if !ok {
		log.Println("Err could not ExtractClaims")
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	var post model.Post
	if err := json.NewDecoder(r.Body).Decode(&post); err != nil {
		fmt.Fprint(w, err.Error())
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	post.UserID = claims.UserID

	if err := s.db.Save(&post).Error; err != nil {
		fmt.Fprint(w, err.Error())
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	res, err := json.Marshal(&post)
	if err != nil {
		fmt.Fprint(w, err.Error())
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.Write(res)
}

// GetAllPosts retrieves all posts from the database, eager-loads comments, orders them by creation time, and returns them as JSON.
func (s Service) GetAllPosts(w http.ResponseWriter, r *http.Request) {
	var posts []model.Post

	if err := s.db.Preload("Comments").Order("created_at DESC").Find(&posts).Error; err != nil {
		fmt.Fprint(w, err.Error())
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	res, err := json.Marshal(&posts)
	if err != nil {
		fmt.Fprint(w, err.Error())
		w.WriteHeader(http.StatusInternalServerError)
		return
	}
	w.Write(res)
}

// DeletePost handles deleting a post from the database based on its ID and user authentication.
func (s Service) DeletePost(w http.ResponseWriter, r *http.Request) {
	idStr, ok := mux.Vars(r)["postID"]
	if !ok {
		w.WriteHeader(http.StatusNotFound)
		return
	}
	id, err := strconv.Atoi(idStr)
	if err != nil {
		w.WriteHeader(http.StatusNotFound)
		return
	}
	claims, ok := auth.ExtractClaims(r.Context())
	if !ok {
		log.Println("Err could not ExtractClaims")
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	err = s.db.Where("user_id = ?", claims.UserID).Delete(&model.Post{}, id).Error
	if err != nil {
		fmt.Fprint(w, err.Error())
		w.WriteHeader(http.StatusInternalServerError)
	}
	w.WriteHeader(http.StatusNoContent)
}