package server

import (
	"context"
	"net/http"

	"music-server/internal/backend"

	"github.com/danielgtaylor/huma/v2"
	"github.com/google/uuid"
)

type coverUploadInput struct {
	UUID    string `path:"uuid" format:"uuid" doc:"UUID of the soundtrack"`
	RawBody []byte `contentType:"image/*" doc:"The image: JPEG, PNG or WebP, at most 10 MB"`
}

// CoverSource is the body of PUT /soundtracks/{uuid}/cover/source.
type CoverSource struct {
	Source string `json:"source" enum:"steamgriddb,anilist" doc:"Where the cover comes from"`
	ID     string `json:"id" minLength:"1" maxLength:"50" doc:"The game's ID on SteamGridDB, or the anime's ID on AniList"`
}

type coverSourceInput struct {
	UUID string `path:"uuid" format:"uuid" doc:"UUID of the soundtrack"`
	Body CoverSource
}

func (s *Server) registerCovers(a huma.API) {
	op := func(id, method, path, summary, description string, errs ...int) huma.Operation {
		return huma.Operation{
			OperationID: id,
			Method:      method,
			Path:        path,
			Summary:     summary,
			Description: description,
			Tags:        []string{"covers"},
			Errors:      errs,
		}
	}
	// covers returns the cover service, or ErrCoversDisabled when COVERS_PATH is not set.
	covers := func() (*backend.CoverService, error) {
		if s.covers == nil {
			return nil, apiError(backend.ErrCoversDisabled)
		}
		return s.covers, nil
	}

	get := op("get-soundtrack-cover", http.MethodGet, "/soundtracks/{uuid}/cover", "Soundtrack cover",
		"Returns the soundtrack's cover image. cover_modified in the soundtrack responses tells when it last changed.",
		http.StatusNotFound)
	get.Responses = fileResponses("The cover image", "image/jpeg", "image/png", "image/webp")
	register(s, a, route{op: get},
		func(ctx context.Context, in *uuidInput) (*huma.StreamResponse, error) {
			if s.covers == nil {
				return nil, huma.Error404NotFound("Not Found")
			}
			path, err := s.covers.Path(ctx, in.id())
			if err != nil {
				return nil, apiError(err)
			}
			return streamFile(path, "", false)
		})

	upload := op("upload-soundtrack-cover", http.MethodPut, "/soundtracks/{uuid}/cover", "Upload a cover",
		"Stores the image as the soundtrack's cover. The automatic search never replaces it; delete it to go back to automatic.",
		http.StatusBadRequest, http.StatusNotFound, http.StatusServiceUnavailable)
	upload.MaxBodyBytes = backend.MaxCoverBytes
	upload.DefaultStatus = http.StatusNoContent
	register(s, a, route{op: upload},
		func(ctx context.Context, in *coverUploadInput) (*struct{}, error) {
			c, err := covers()
			if err != nil {
				return nil, err
			}
			if err := c.Upload(ctx, uuid.MustParse(in.UUID), in.RawBody); err != nil {
				return nil, apiError(err)
			}
			return nil, nil
		})

	source := op("set-soundtrack-cover-source", http.MethodPut, "/soundtracks/{uuid}/cover/source", "Pick a cover",
		"Downloads the cover of the given SteamGridDB game or AniList anime and stores it as the soundtrack's cover. "+
			"The automatic search never replaces it. SteamGridDB needs STEAMGRIDDB_API_KEY on the server.",
		http.StatusBadRequest, http.StatusNotFound, http.StatusBadGateway, http.StatusServiceUnavailable)
	source.DefaultStatus = http.StatusNoContent
	register(s, a, route{op: source},
		func(ctx context.Context, in *coverSourceInput) (*struct{}, error) {
			c, err := covers()
			if err != nil {
				return nil, err
			}
			if err := c.FromSource(ctx, uuid.MustParse(in.UUID), in.Body.Source, in.Body.ID); err != nil {
				return nil, apiError(err)
			}
			return nil, nil
		})

	remove := op("delete-soundtrack-cover", http.MethodDelete, "/soundtracks/{uuid}/cover", "Remove the cover",
		"Deletes the soundtrack's cover, including one set by hand, so the automatic search looks for a new one.",
		http.StatusNotFound, http.StatusServiceUnavailable)
	remove.DefaultStatus = http.StatusNoContent
	register(s, a, route{op: remove},
		func(ctx context.Context, in *uuidInput) (*struct{}, error) {
			c, err := covers()
			if err != nil {
				return nil, err
			}
			if err := c.Remove(ctx, in.id()); err != nil {
				return nil, apiError(err)
			}
			return nil, nil
		})
}