package app

import (
	"context"
	"errors"
	"mime"

	"evening_detective_server/internal/modules/processor_jwt"
	"evening_detective_server/internal/modules/roles"
	"evening_detective_server/internal/modules/team_qr_pdf"
	"evening_detective_server/internal/repos/games_repo"
	"evening_detective_server/proto"

	"google.golang.org/genproto/googleapis/api/httpbody"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/grpc/status"
)

func (s *server) DownloadTeamQR(ctx context.Context, req *proto.GetGameReq) (*httpbody.HttpBody, error) {
	claims, ok := ctx.Value("claims").(*processor_jwt.JWTClaims)
	if !ok || claims == nil {
		return nil, status.Error(codes.Unauthenticated, "необходима авторизация")
	}
	if !roles.HasRole(claims, roles.Organizer) && !roles.HasRole(claims, roles.Author) {
		return nil, status.Error(codes.PermissionDenied, "permission denied")
	}
	if req == nil || req.Id <= 0 {
		return nil, status.Error(codes.InvalidArgument, "некорректный идентификатор игры")
	}
	data, filename, err := s.teamService.DownloadTeamQR(ctx, int(req.Id))
	if err != nil {
		switch {
		case errors.Is(err, games_repo.ErrGameNotFound):
			return nil, status.Error(codes.NotFound, err.Error())
		case errors.Is(err, team_qr_pdf.ErrNoCards):
			return nil, status.Error(codes.FailedPrecondition, err.Error())
		default:
			return nil, status.Error(codes.Internal, err.Error())
		}
	}
	if err := grpc.SetHeader(ctx, metadata.Pairs(
		"Content-Disposition", mime.FormatMediaType("attachment", map[string]string{"filename": filename}),
		"X-Content-Type-Options", "nosniff",
		"Cache-Control", "no-store",
	)); err != nil {
		return nil, status.Error(codes.Internal, "не удалось установить заголовки PDF")
	}
	return &httpbody.HttpBody{ContentType: "application/pdf", Data: data}, nil
}