package rest

import (
	"context"
	"database/sql"
	"errors"
	"log/slog"
	"net/http"
	"time"

	"goAuth/internal/auth"
	"goAuth/internal/invite"
	"goAuth/internal/jitsi"
	"goAuth/internal/middleware"
	"goAuth/internal/migration"
	"goAuth/internal/user"

	_ "github.com/mattn/go-sqlite3"
)

type Handler struct {
	cfg Config

	db *sql.DB

	users    *user.Service
	invites  *invite.Service
	sessions *auth.Service
	jitsi    *jitsi.Service
}

func New(cfg Config) (*Handler, error) {
	if cfg.Cookies.SessionName == "" {
		cfg.Cookies.SessionName = DefaultSessionCookie
	}
	if cfg.Cookies.CsrfName == "" {
		cfg.Cookies.CsrfName = DefaultCsrfCookie
	}
	if cfg.Sessions.TokenSize <= 0 {
		cfg.Sessions.TokenSize = DefaultTokenSize
	}

	db, err := openDatabase(cfg.DatabasePath)
	if err != nil {
		return nil, err
	}

	if err := migrate(context.Background(), db); err != nil {
		db.Close()
		return nil, err
	}

	handler, err := wire(cfg, db)
	if err != nil {
		db.Close()
		return nil, err
	}

	if err := seed(context.Background(), handler.users); err != nil {
		handler.Close()
		return nil, err
	}

	return handler, nil
}

func openDatabase(path string) (*sql.DB, error) {
	db, err := sql.Open("sqlite3", path+"?_foreign_keys=on")
	if err != nil {
		slog.Error("open database", slog.String("op", "rest.openDatabase"), slog.Any("error", err))
		return nil, err
	}
	db.SetMaxOpenConns(1)
	return db, nil
}

func wire(cfg Config, db *sql.DB) (*Handler, error) {
	userRepo, err := user.NewRepository(db)
	if err != nil {
		return nil, err
	}
	inviteRepo, err := invite.NewRepository(db)
	if err != nil {
		return nil, err
	}
	sessionRepo, err := auth.NewRepository(db)
	if err != nil {
		return nil, err
	}
	jitsiRepo, err := jitsi.NewRepository(db)
	if err != nil {
		return nil, err
	}

	userService, err := user.NewService(userRepo)
	if err != nil {
		return nil, err
	}
	inviteService, err := invite.NewService(inviteRepo, 0, 0)
	if err != nil {
		return nil, err
	}
	sessionService, err := auth.NewService(
		sessionRepo,
		userService,
		inviteService,
		cfg.Sessions.ShortDuration,
		cfg.Sessions.LongDuration,
		cfg.Sessions.TokenSize,
	)
	if err != nil {
		return nil, err
	}
	jitsiService, err := jitsi.NewService(
		jitsiRepo,
		cfg.Jitsi.Secret,
		cfg.Jitsi.AppId,
		cfg.Jitsi.AppName,
		cfg.Jitsi.Domain,
	)
	if err != nil {
		return nil, err
	}

	return &Handler{
		cfg:      cfg,
		db:       db,
		users:    userService,
		invites:  inviteService,
		sessions: sessionService,
		jitsi:    jitsiService,
	}, nil
}

func migrate(ctx context.Context, db *sql.DB) error {
	migrator := migration.NewMigrator(db)
	migrator.Register("user", user.Migrations()...)
	migrator.Register("auth", auth.Migrations()...)
	migrator.Register("invite", invite.Migrations()...)
	migrator.Register("jitsi", jitsi.Migrations()...)

	return migrator.Run(ctx)
}

func (h *Handler) Close() error {
	if h.db == nil {
		return nil
	}
	return h.db.Close()
}

func (h *Handler) Router() http.Handler {
	mux := http.NewServeMux()
	h.registerRoutes(mux)
	return mux
}

func (h *Handler) Serve(ctx context.Context) error {
	server := &http.Server{
		Addr:              h.cfg.Addr,
		Handler:           h.Router(),
		ReadHeaderTimeout: 10 * time.Second,
		ReadTimeout:       30 * time.Second,
		WriteTimeout:      30 * time.Second,
		IdleTimeout:       60 * time.Second,
	}

	serveErr := make(chan error, 1)
	go func() {
		slog.Info("rest server listening", slog.String("addr", h.cfg.Addr))
		if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			serveErr <- err
			return
		}
		serveErr <- nil
	}()

	select {
	case err := <-serveErr:
		return err
	case <-ctx.Done():
		shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		defer cancel()
		return server.Shutdown(shutdownCtx)
	}
}

func (h *Handler) sessionMiddleware() middleware.Middleware {
	return h.sessions.NewMiddleware(h.cfg.Cookies.SessionName)
}