package admin

import (
	"fmt"
	"html/template"
	"net/http"
	"path"
	"strings"

	"arimelody.me/arimelody.me/global"
	"arimelody.me/arimelody.me/music/model"
)

type (
    gatewayTrack struct {
        *model.Track
        Lyrics template.HTML
        Number int
    }

    gatewayRelease struct {
        *model.Release
        Tracks []gatewayTrack
    }
)

func serveRelease() http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        slices := strings.Split(r.URL.Path[1:], "/")
        id := slices[0]
        release := global.GetRelease(id)
        if release == nil {
            http.NotFound(w, r)
            return
        }

        if len(slices) > 1 {
            switch slices[1] {
            case "editcredits":
                serveEditCredits(release).ServeHTTP(w, r)
                return
            case "addcredit":
                serveAddCredit(release).ServeHTTP(w, r)
                return
            case "newcredit":
                serveNewCredit().ServeHTTP(w, r)
                return
            }
            http.NotFound(w, r)
            return
        }

        tracks := []gatewayTrack{}
        for i, track := range release.Tracks {
            tracks = append([]gatewayTrack{{
                Track: track,
                Lyrics: template.HTML(strings.Replace(track.Lyrics, "\n", "<br>", -1)),
                Number: len(release.Tracks) - i,
            }}, tracks...)
        }

        lrw := global.LoggingResponseWriter{ResponseWriter: w, Code: http.StatusOK}

        serveTemplate("edit-release.html", gatewayRelease{release, tracks}).ServeHTTP(&lrw, r)

        if lrw.Code != http.StatusOK {
            fmt.Printf("Error rendering admin release page for %s\n", id)
            return
        }
    })
}

func serveEditCredits(release *model.Release) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        w.Header().Set("Content-Type", "text/html")
        serveComponent(path.Join("credits", "editcredits.html"), release).ServeHTTP(w, r)
        return
    })
}

func serveAddCredit(release *model.Release) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        var artists = []*model.Artist{}
        for _, artist := range global.Artists {
            var exists = false
            for _, credit := range release.Credits {
                if credit.Artist == artist {
                    exists = true
                    break
                }
            }
            if !exists {
                artists = append(artists, artist)
            }
        }

        type response struct {
            ReleaseID   string;
            Artists     []*model.Artist
        }

        w.Header().Set("Content-Type", "text/html")
        serveComponent(path.Join("credits", "addcredit.html"), response{
            ReleaseID: release.ID,
            Artists: artists,
        }).ServeHTTP(w, r)
        return
    })
}

func serveNewCredit() http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        artist := global.GetArtist(strings.Split(r.URL.Path, "/")[3])
        if artist == nil {
            http.NotFound(w, r)
            return
        }

        w.Header().Set("Content-Type", "text/html")
        serveComponent(path.Join("credits", "newcredit.html"), artist).ServeHTTP(w, r)
        return
    })
}