package routes

import (
	"backend/database"
	"database/sql"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/go-chi/chi/v5"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

func RegisterNovelsRoutes(r chi.Router) {
	r.Route("/", func(s chi.Router) {
		s.Get("/", getNovels)
		s.Post("/", createNovel)
	})
	r.Route("/{novelId:[0-9]+}", func(s chi.Router) {
		s.Get("/", getNovel)
		s.Put("/", updateNovel)
		s.Delete("/", deleteNovel)
	})
	r.Post("/{novelId:[0-9]+}/cover", uploadNovelCover)
	r.Route("/{novelId:[0-9]+}/comments", func(s chi.Router) {
		s.Get("/", getNovelComments)
		s.Post("/", createNovelComment)
	})
	r.Get("/{novelId:[0-9]+}/characters", resolveNovelCharacters)
	r.Get("/{novelId:[0-9]+}/genres", resolveNovelGenres)
}

func getNovels(w http.ResponseWriter, r *http.Request) {
	sortBy, ok := r.URL.Query()["sort"]

	if !ok || len(sortBy) <= 0 {
		sortBy = append(sortBy, "rating")
	}

	query, ok := r.URL.Query()["q"]
	if ok {
		novels, err := database.SearchNovels(query[0])
		Response(w, err, novels)
		return
	}

	novels, err := database.FetchNovels(sortBy[0])
	Response(w, err, &novels)
}
func createNovel(w http.ResponseWriter, r *http.Request) {
	body, err := ReadBody(r)
	if err != nil {
		Error(w, err)
		return
	}

	var novel database.Novel
	err = json.Unmarshal(body, &novel)
	if err != nil {
		Error(w, err)
		return
	}

	novel, err = database.CreateNovel(&novel)
	if err == nil {
		w.WriteHeader(http.StatusCreated)
		w.Header().Add("Location", fmt.Sprintf("https://%v%v/%v", r.Host, r.URL, novel.ID))
	}
	Response(w, err, &novel)
}

func getNovel(w http.ResponseWriter, r *http.Request) {
	novelId := IURLParam(r, "novelId")
	novel, err := database.FetchNovel(novelId)
	Response(w, err, novel)
}
func updateNovel(w http.ResponseWriter, r *http.Request) {
	novelId := IURLParam(r, "novelId")

	body, err := ReadBody(r)
	if err != nil {
		Error(w, err)
		return
	}

	novel, err := database.FetchNovel(novelId)
	if err != nil {
		Response(w, err, nil)
		return
	}
	err = json.Unmarshal(body, novel)
	if err != nil {
		Error(w, err)
		return
	}

	novel, err = database.UpdateNovel(novel)
	Response(w, err, novel)
}
func deleteNovel(w http.ResponseWriter, r *http.Request) {
	novelId := IURLParam(r, "novelId")
	_, err := database.FetchNovel(novelId)
	if errors.Is(err, sql.ErrNoRows) {
		NotFound.Ferror(w)
		return
	}

	err = database.DeleteNovel(novelId)
	if err != nil {
		w.WriteHeader(500)
		Error(w, err)
		return
	}
	w.WriteHeader(http.StatusNoContent)
	JSON(w, "")
}

func uploadNovelCover(w http.ResponseWriter, r *http.Request) {
	user, err := GetCurrentUser(r)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		Error(w, err)
		return
	}

	if !hasPermission(user, "novel") {
		NoAccess.Ferror(w)
		return
	}

	novelId := IURLParam(r, "novelId")

	err = r.ParseMultipartForm(1024 * 1024 * 2)
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		Error(w, err)
		return
	}

	file, handler, err := r.FormFile("cover")
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		Error(w, err)
		return
	}

	if !strings.HasPrefix(handler.Header["Content-Type"][0], "image") {
		w.WriteHeader(http.StatusBadRequest)
		RawError(w, "Wrong document type!")
		return
	}

	fileBytes, err := io.ReadAll(file)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		Error(w, err)
		return
	}
	err = file.Close()
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		Error(w, err)
		return
	}

	ext := strings.Split(handler.Header["Content-Type"][0], "/")[1]
	path := filepath.Join(os.Getenv("CDN_PATH"), "novels", "logo", fmt.Sprintf("%v.%v", novelId, ext))

	err = os.WriteFile(path, fileBytes, 0644)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		Error(w, err)
		return
	}
	coverPath := fmt.Sprintf("%v/novels/logo/%v.%v", os.Getenv("CDN_URL"), novelId, ext)
	err = database.UpdateNovelCover(novelId, coverPath)
	Response(w, err, coverPath)
}

func getNovelComments(w http.ResponseWriter, r *http.Request) {
	novelId := IURLParam(r, "novelId")
	offsetParam, ok := r.URL.Query()["offset"]
	if !ok || len(offsetParam) <= 0 {
		offsetParam = append(offsetParam, "0")
	}

	countParam, ok := r.URL.Query()["count"]
	if !ok || len(countParam) <= 0 {
		countParam = append(countParam, "5")
	}

	offset, _ := strconv.Atoi(offsetParam[0])
	count, _ := strconv.Atoi(countParam[0])

	var response = make(map[string]interface{}, 2)
	comments, err := database.FetchNovelComments(novelId)
	response["count"] = len(comments)

	if offset+count > len(comments) {
		comments = comments[offset:]
	} else {
		comments = comments[offset : offset+count]
	}
	response["comments"] = comments
	Response(w, err, response)
}

func createNovelComment(w http.ResponseWriter, r *http.Request) {
	novelId := IURLParam(r, "novelId")
	user, err := GetCurrentUser(r)
	if err != nil {
		Error(w, err)
		return
	}
	body, err := ReadBody(r)
	if err != nil {
		Error(w, err)
		return
	}
	commentData := database.CommentNovel{NovelID: int16(novelId), UserID: user.ID}
	err = json.Unmarshal(body, &commentData)
	if err != nil {
		Error(w, err)
		return
	}

	comment, err := database.AddNovelComment(commentData)
	Response(w, err, comment)
}

func resolveNovelGenres(w http.ResponseWriter, r *http.Request) {
	novelId := IURLParam(r, "novelId")
	genres, err := database.FetchNovelGenres(novelId)
	Response(w, err, genres)
}

func resolveNovelCharacters(w http.ResponseWriter, r *http.Request) {
	novelId := IURLParam(r, "novelId")
	characters, err := database.FetchNovelCharacters(novelId)
	Response(w, err, characters)
}