package api

import (
	"context"
	"time"

	codequestpb "github.com/hhhapz/codequest/api/v1"
	"github.com/hhhapz/codequest/models"
	"github.com/hhhapz/codequest/question"
	"golang.org/x/oauth2"
	"google.golang.org/grpc"
	"google.golang.org/grpc/reflection"
)

// inProd tells the server whether it is in prod.
// It should be set using ldflags on build time.
var inProd bool

type OAuthStore interface {
	Create(string) string
	Validate(context.Context, string, string) (*oauth2.Token, string, error)
}

type UserStore interface {
	ConsumeToken(context.Context, *oauth2.Token) (*models.Token, error)

	CreateToken(context.Context, *models.User) (*models.Token, error)
	RevokeToken(context.Context, string) error
	RevokeUserTokens(context.Context, *models.User) (int64, error)

	User(context.Context, string) (*models.User, error)
	UserPoints(context.Context, *models.User) (int, error)

	Users(context.Context) ([]*models.User, error)

	UserByToken(context.Context, string) (*models.User, error)

	UpdateUser(context.Context, *models.User) error
	DeleteUser(context.Context, *models.User) error
}

type QuestStore interface {
	Questions(context.Context, *models.User) ([]*question.Data, error)
	Question(context.Context, *models.User, string) (*question.Data, error)
	Submissions(context.Context, *models.User, string, question.Part) (bool, int, error)
	AddSubmission(context.Context, *models.QuestionAttempt) error
	Leaderboard(context.Context) ([]*models.LeaderboardEntry, error)
}

type CooldownStore interface {
	NewAttempt(userID string, questionID string, attempts int)
	Check(userID string, questionID string) time.Duration
}

type Server struct {
	*AuthService
	*UserService
	*QuestService
}

func NewServer(os OAuthStore, us UserStore, qs QuestStore, cs CooldownStore) (*grpc.Server, error) {
	s := &Server{
		AuthService: &AuthService{
			oauthStore: os,
			userStore:  us,
		},
		UserService: &UserService{
			userStore: us,
		},
		QuestService: &QuestService{
			userStore:     us,
			questStore:    qs,
			cooldownStore: cs,
		},
	}
	srv := grpc.NewServer(
		grpc.UnaryInterceptor(AuthInterceptor(s.AuthService.defaultAuthFunc)),
	)
	reflection.Register(srv)
	codequestpb.RegisterAuthServiceServer(srv, s.AuthService)
	codequestpb.RegisterUserServiceServer(srv, s.UserService)
	codequestpb.RegisterQuestServiceServer(srv, s.QuestService)
	return srv, nil
}