mangaGetter/internal/server/handler.go

package server

import (
	"bytes"
	"cmp"
	"fmt"
	"golang.org/x/text/cases"
	"golang.org/x/text/language"
	"html/template"
	"mangaGetter/internal/database"
	"mangaGetter/internal/view"
	"net/http"
	"slices"
	"strconv"
	"strings"
	"time"
)

func (s *Server) HandleNew(w http.ResponseWriter, r *http.Request) {
	title := r.PathValue("title")
	chapter := r.PathValue("chapter")

	url := fmt.Sprintf("/title/%s/%s", title, chapter)

	s.Mutex.Lock()
	s.ImageBuffers = make(map[string]*bytes.Buffer)
	s.Mutex.Unlock()
	s.CurrSubUrl = url
	s.PrevSubUrl = ""
	s.NextSubUrl = ""
	s.LoadCurr()

	go s.LoadNext()
	go s.LoadPrev()

	http.Redirect(w, r, "/current/", http.StatusTemporaryRedirect)
}

func (s *Server) HandleMenu(w http.ResponseWriter, _ *http.Request) {
	tmpl := template.Must(view.GetViewTemplate(view.Menu))

	fmt.Println("Locking Rw in handler.go:43")
	s.DbMgr.Rw.Lock()
	defer func() {
		fmt.Println("Unlocking Rw in handler.go:46")
		s.DbMgr.Rw.Unlock()
	}()

	all := s.DbMgr.Mangas
	l := len(all)
	mangaViewModels := make([]view.MangaViewModel, l)
	counter := 0

	for _, manga := range all {
		title := cases.Title(language.English, cases.Compact).String(strings.Replace(manga.Title, "-", " ", -1))

		thumbnail, err := s.LoadThumbnail(manga.Id)
		if err != nil {
			continue
		}
		manga.Thumbnail = s.ImageBuffers[thumbnail]

		mangaViewModels[counter] = view.MangaViewModel{
			ID:     manga.Id,
			Title:  title,
			Number: manga.LatestChapter.Number,
			// I Hate this time Format... 15 = hh, 04 = mm, 02 = DD, 01 = MM, 06 == YY
			LastTime:     time.Unix(manga.TimeStampUnix, 0).Format("15:04 (02-01-06)"),
			Url:          manga.LatestChapter.Url,
			ThumbnailUrl: thumbnail,
		}
		counter++
	}

	slices.SortStableFunc(mangaViewModels, func(a, b view.MangaViewModel) int {
		return cmp.Compare(a.Title, b.Title)
	})

	menuViewModel := view.MenuViewModel{
		Mangas: mangaViewModels,
	}

	err := tmpl.Execute(w, menuViewModel)
	if err != nil {
		fmt.Println(err)
	}
}

func (s *Server) HandleDelete(w http.ResponseWriter, r *http.Request) {
	mangaStr := r.PostFormValue("mangaId")

	if mangaStr == "" {
		http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
		return
	}

	mangaId, err := strconv.Atoi(mangaStr)
	if err != nil {
		fmt.Println(err)
		http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
		return
	}

	err = s.DbMgr.Delete(mangaId)
	if err != nil {
		fmt.Println(err)
	}

	http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
}

func (s *Server) HandleExit(w http.ResponseWriter, r *http.Request) {
	err := s.DbMgr.Save()
	if err != nil {
		fmt.Println(err)
		return
	}

	http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
}

func (s *Server) HandleCurrent(w http.ResponseWriter, _ *http.Request) {
	tmpl := template.Must(view.GetViewTemplate(view.Viewer))

	fmt.Println("Locking Rw in handler.go:125")
	s.DbMgr.Rw.Lock()
	defer func() {
		fmt.Println("Unlocking Rw in handler.go:128")
		s.DbMgr.Rw.Unlock()
	}()

	mangaId, chapterId, err := s.Provider.GetTitleIdAndChapterId(s.CurrSubUrl)
	if err != nil {
		fmt.Println(err)
	} else {
		title, chapter, err := s.Provider.GetTitleAndChapter(s.CurrSubUrl)
		if err != nil {
			fmt.Println(err)
		} else {
			var manga *database.Manga
			if s.DbMgr.Mangas[mangaId] == nil {
				manga = &database.Manga{
					Id:            mangaId,
					Title:         title,
					TimeStampUnix: time.Now().Unix(),
				}
				s.DbMgr.Mangas[mangaId] = manga
			} else {
				manga = s.DbMgr.Mangas[mangaId]
				s.DbMgr.Mangas[mangaId].TimeStampUnix = time.Now().Unix()
			}

			if s.DbMgr.Chapters[chapterId] == nil {
				chapterNumberStr := strings.Replace(chapter, "ch_", "", 1)
				number, err := strconv.Atoi(chapterNumberStr)
				if err != nil {
					fmt.Println(err)
					number = 0
				}

				s.DbMgr.Chapters[chapterId] = &database.Chapter{
					Id:            chapterId,
					Manga:         manga,
					Url:           s.CurrSubUrl,
					Name:          chapter,
					Number:        number,
					TimeStampUnix: time.Now().Unix(),
				}
			} else {
				s.DbMgr.Chapters[chapterId].TimeStampUnix = time.Now().Unix()
			}

			s.DbMgr.Mangas[mangaId].LatestChapter = s.DbMgr.Chapters[chapterId]
		}
	}

	err = tmpl.Execute(w, s.CurrViewModel)
	if err != nil {
		fmt.Println(err)
	}
}

func (s *Server) HandleImage(w http.ResponseWriter, r *http.Request) {
	u := r.PathValue("url")
	s.Mutex.Lock()
	defer s.Mutex.Unlock()
	buf := s.ImageBuffers[u]
	if buf == nil {
		fmt.Printf("url: %s is nil\n", u)
		w.WriteHeader(400)
		return
	}

	w.Header().Set("Content-Type", "image/webp")
	_, err := w.Write(buf.Bytes())
	if err != nil {
		fmt.Println(err)
	}
}

func (s *Server) HandleNext(w http.ResponseWriter, r *http.Request) {
	fmt.Println("Received Next")

	if s.PrevViewModel != nil {
		go func(viewModel view.ImageViewModel, s *Server) {
			s.Mutex.Lock()
			for _, img := range viewModel.Images {
				delete(s.ImageBuffers, img.Path)
			}
			s.Mutex.Unlock()
			fmt.Println("Cleaned out of scope Last")
		}(*s.PrevViewModel, s)
	}

	s.PrevViewModel = s.CurrViewModel
	s.CurrViewModel = s.NextViewModel
	s.PrevSubUrl = s.CurrSubUrl
	s.CurrSubUrl = s.NextSubUrl

	<-s.NextReady

	go s.LoadNext()

	http.Redirect(w, r, "/current/", http.StatusTemporaryRedirect)
}
func (s *Server) HandlePrev(w http.ResponseWriter, r *http.Request) {
	fmt.Println("Received Prev")
	if s.NextViewModel != nil {
		go func(viewModel view.ImageViewModel, s *Server) {
			s.Mutex.Lock()
			for _, img := range viewModel.Images {
				delete(s.ImageBuffers, img.Path)
			}
			s.Mutex.Unlock()
			fmt.Println("Cleaned out of scope Last")
		}(*s.NextViewModel, s)
	}

	s.NextViewModel = s.CurrViewModel
	s.CurrViewModel = s.PrevViewModel
	s.NextSubUrl = s.CurrSubUrl
	s.CurrSubUrl = s.PrevSubUrl

	<-s.PrevReady

	go s.LoadPrev()

	http.Redirect(w, r, "/current/", http.StatusTemporaryRedirect)
}

func (s *Server) HandleNewQuery(w http.ResponseWriter, r *http.Request) {
	sub := r.PostFormValue("subUrl")

	url := fmt.Sprintf("/title/%s", sub)

	s.Mutex.Lock()
	s.ImageBuffers = make(map[string]*bytes.Buffer)
	s.Mutex.Unlock()
	s.CurrSubUrl = url
	s.PrevSubUrl = ""
	s.NextSubUrl = ""
	s.LoadCurr()

	go s.LoadNext()
	go s.LoadPrev()

	http.Redirect(w, r, "/current/", http.StatusTemporaryRedirect)
}