package api

import (
	"errors"
	"net/http"
	"strings"
	"time"

	"github.com/go-chi/chi/v5"

	"github.com/cdnutter/playlink/internal/art"
	"github.com/cdnutter/playlink/internal/engine"
)

func (s *Server) handleArtSettings(w http.ResponseWriter, r *http.Request) {
	cfg := s.eng.ArtSettings(r.Context())
	writeJSON(w, 200, map[string]any{"settings": cfg, "all_sources": art.AllSources})
}

func (s *Server) handlePutArtSettings(w http.ResponseWriter, r *http.Request) {
	var cfg engine.ArtSettings
	if !readJSON(w, r, &cfg) {
		return
	}
	if err := s.eng.SetArtSettings(r.Context(), cfg); err != nil {
		writeErr(w, 400, err)
		return
	}
	s.handleArtSettings(w, r)
}

func (s *Server) handleArtSearch(w http.ResponseWriter, r *http.Request) {
	q := r.URL.Query()
	query := art.Query{Artist: q.Get("artist"), Album: q.Get("album"), Text: q.Get("q")}
	if strings.TrimSpace(query.Artist+query.Album+query.Text) == "" {
		writeErr(w, 400, errors.New("enter an artist, album or search text"))
		return
	}
	var sources []string
	if src := q.Get("sources"); src != "" {
		sources = strings.Split(src, ",")
	}
	res, errs, err := s.eng.SearchArt(r.Context(), query, sources)
	if err != nil {
		writeErr(w, 500, err)
		return
	}
	writeJSON(w, 200, map[string]any{"results": res, "errors": errs})
}

func (s *Server) handleArtPrepare(w http.ResponseWriter, r *http.Request) {
	var body struct {
		URL string `json:"url"`
	}
	if !readJSON(w, r, &body) {
		return
	}
	p, err := s.eng.PrepareArtURL(r.Context(), body.URL)
	if err != nil {
		writeErr(w, 400, err)
		return
	}
	writeJSON(w, 200, p)
}

func (s *Server) handleArtUpload(w http.ResponseWriter, r *http.Request) {
	f, _, err := r.FormFile("image")
	if err != nil {
		writeErr(w, 400, errors.New("choose an image file"))
		return
	}
	defer f.Close()
	p, err := s.eng.PrepareArtUpload(r.Context(), f)
	if err != nil {
		writeErr(w, 400, err)
		return
	}
	writeJSON(w, 200, p)
}

func (s *Server) handleArtPrepared(w http.ResponseWriter, r *http.Request) {
	p, err := s.eng.PreparedArtPath(chi.URLParam(r, "token"))
	if err != nil {
		writeErr(w, 404, err)
		return
	}
	w.Header().Set("Content-Type", "image/jpeg")
	w.Header().Set("Cache-Control", "private, max-age=3600")
	http.ServeFile(w, r, p)
}

func (s *Server) handleCover(w http.ResponseWriter, r *http.Request) {
	id, _ := idParam(r)
	q := r.URL.Query()
	b, err := s.eng.Cover(r.Context(), id, q.Get("side"), q.Get("path"))
	if err != nil {
		opErr(w, err)
		return
	}
	if len(b) == 0 {
		w.WriteHeader(http.StatusNoContent)
		return
	}
	w.Header().Set("Content-Type", http.DetectContentType(b))
	w.Header().Set("Cache-Control", "no-cache")
	http.ServeContent(w, r, "cover", time.Time{}, strings.NewReader(string(b)))
}

func (s *Server) handleAlbum(w http.ResponseWriter, r *http.Request) {
	id, _ := idParam(r)
	q := r.URL.Query()
	a, err := s.eng.AlbumSongs(r.Context(), id, q.Get("side"), q.Get("path"))
	if err != nil {
		opErr(w, err)
		return
	}
	writeJSON(w, 200, a)
}

func (s *Server) handleArtAuto(w http.ResponseWriter, r *http.Request) {
	id, _ := idParam(r)
	var m engine.ArtMatch
	if !readJSON(w, r, &m) {
		return
	}
	if !s.preAction(w, r, id, "auto-match album art") {
		return
	}
	j, err := s.eng.StartArtAutoMatch(id, m)
	if err != nil {
		opErr(w, err)
		return
	}
	writeJSON(w, 202, j)
}

// handleArtThumb shows a search result's thumbnail through the server, so
// the page keeps its strict content policy and the browser never contacts
// the image hosts directly. Fetching uses the local-network-safe client.
func (s *Server) handleArtThumb(w http.ResponseWriter, r *http.Request) {
	b, err := s.eng.FetchArtThumb(r.Context(), r.URL.Query().Get("u"))
	if err != nil {
		writeErr(w, 502, err)
		return
	}
	ct := http.DetectContentType(b)
	if !strings.HasPrefix(ct, "image/") {
		writeErr(w, 502, errors.New("not an image"))
		return
	}
	w.Header().Set("Content-Type", ct)
	w.Header().Set("Cache-Control", "private, max-age=86400")
	w.Write(b)
}