package main

import (
	"context"
	"errors"
	"log/slog"
	"os"
	"os/signal"
	"path"
	"syscall"

	"arimelody.space/melody-vod-manager/config"
	"arimelody.space/melody-vod-manager/logger"
	"arimelody.space/melody-vod-manager/server"
	"arimelody.space/melody-vod-manager/templates"
	"github.com/gin-gonic/gin"
	"github.com/mattn/go-isatty"
)

func main() {
	var err error

	ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer cancel()

	gin.SetMode(gin.ReleaseMode)

	var handlers []slog.Handler
	slogger := slog.New(logger.NewSlogHandler(os.Stderr, logger.Options{
		Handlers: handlers,
		IsTerminal: isatty.IsTerminal(os.Stderr.Fd()),
		Level: slog.LevelDebug,
	}))
	slog.SetDefault(slogger)

	cliLogger := slogger.WithGroup("CLI")

	cliLogger.Debug("Running with arguments:", "args", os.Args)

	userConfigDir, err := os.UserConfigDir()
	if err != nil {
		cliLogger.Error("Could not determine user configuration directory:", "err", err)
		os.Exit(1)
	}
	configLocations := []string{
		"config.toml",
		path.Join(userConfigDir, "melody-vod-manager", "config.toml"),
		"/etc/melody-vod-manager/config.toml",
	}
	var cfg *config.Config
	for _, path := range configLocations {
		cliLogger.Debug("Checking config path:", "path", path)
		cfg, err = config.ReadConfig(path)
		if !os.IsNotExist(err) { break }
	}
	if cfg == nil {
		cliLogger.Error("Failed to load configuration!", "err", err)
		os.Exit(1)
	}

	var templateDir string
	templateLocations := []string{
		path.Join(userConfigDir, "melody-vod-manager", "templates"),
		"/etc/melody-vod-manager/templates",
	}
	var textTemplates *templates.TextTemplates
	for _, dir := range templateLocations {
		cliLogger.Debug("Checking template directory:", "dir", dir)
		textTemplates, err = templates.FetchTemplates(ctx, dir)
		if err == nil { templateDir = dir }
		if !os.IsNotExist(err) { break }
	}
	if err != nil {
		cliLogger.Error("Failed to fetch templates:", "err", err)
		os.Exit(1)
	}

	srv, err := server.New(
		server.VODServerConfig{
			Host: cfg.Host,
			Port: cfg.Port,
			VODDirectory: cfg.VODDirectory,
			TemplateDirectory: templateDir,
		},
		server.VODGoogleConfig{
			ApiKey: cfg.Google.ApiKey,
			ClientID: cfg.Google.ClientID,
			ClientSecret: cfg.Google.ClientSecret,
		},
		textTemplates,
	)
	if err != nil { panic(err) }

	if err = srv.Run(ctx); err != nil {
		if !errors.Is(err, context.Canceled) {
			cliLogger.Error("A fatal error has occurred:", "err", err)
		}
	}
}