package cmd

import (
	"context"
	"log/slog"
	"os"
	"strings"
	"time"

	"git.coopcloud.tech/wiki-cafe/member-console/internal/db"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/logging"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/server"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/workflows"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/workflows/fedwiki"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"go.temporal.io/sdk/client"
)

var startCmd = &cobra.Command{
	Use:   "start",
	Short: "Start serving the member-console web application",
	Long: `The start command starts an HTTP server that serves the member-console web
	application from the components directory in the current directory.
	
	The server listens on port 8080 by default, unless a different port is specified using the --port flag.`,
	Args: cobra.NoArgs,
	Run: func(cmd *cobra.Command, args []string) {
		// Create base context for the application
		ctx := context.Background()

		// Set up structured logging
		env := viper.GetString("env")
		logger := logging.SetupLogger(env)

		// Store logger in context
		ctx = logging.WithContext(ctx, logger)

		// Database Setup
		dbDSN := viper.GetString("db-dsn")
		dbConfig := db.DefaultDBConfig(dbDSN)
		database, err := db.ConnectAndMigrate(ctx, logger, dbConfig)
		if err != nil {
			logger.Error("failed to initialize database", slog.Any("error", err))
			os.Exit(1)
		}
		defer database.Close()

		// You'll pass 'database' (or your sqlc Querier) to your server/handlers.
		// For example, by adding it to the server.Config
		// Validate and load configurations from files if specified
		configPairs := []struct {
			value     string
			file      string
			configKey string
		}{
			{viper.GetString("oidc-sp-client-secret"), viper.GetString("oidc-sp-client-secret-file"), "oidc-sp-client-secret"},
			{viper.GetString("session-secret"), viper.GetString("session-secret-file"), "session-secret"},
			{viper.GetString("csrf-secret"), viper.GetString("csrf-secret-file"), "csrf-secret"},
			{viper.GetString("fedwiki-admin-token"), viper.GetString("fedwiki-admin-token-file"), "fedwiki-admin-token"},
			{viper.GetString("temporal-oauth-client-secret"), viper.GetString("temporal-oauth-client-secret-file"), "temporal-oauth-client-secret"},
		}

		// Check for conflicts between direct values and file paths
		for _, pair := range configPairs {
			// Check if both a direct value and a file path are provided
			if pair.value != "" && pair.file != "" {
				logger.Error("configuration error",
					slog.String("config", pair.configKey),
					slog.String("error", "both direct value and file path provided; use only one"))
				return
			}

			// If a file path is provided, load the value from the file
			if pair.file != "" {
				value, err := loadFromFile(pair.file)
				if err != nil {
					logger.Error("failed to load configuration from file",
						slog.String("config", pair.configKey),
						slog.String("file", pair.file),
						slog.Any("error", err))
					return
				}
				viper.Set(pair.configKey, value)
			}
		}

		// Retrieve the configuration values from Viper
		port := viper.GetString("port")
		csrfSecret := viper.GetString("csrf-secret")

		// Create Temporal client if configured
		var temporalClient client.Client
		temporalHost := viper.GetString("temporal-host")
		if temporalHost != "" {
			temporalOAuthTokenURL := viper.GetString("temporal-oauth-token-url")
			temporalOAuthClientID := viper.GetString("temporal-oauth-client-id")
			temporalOAuthClientSecret := viper.GetString("temporal-oauth-client-secret")
			temporalOAuthScopes := viper.GetStringSlice("temporal-oauth-scopes")

			clientCfg := workflows.ClientConfig{
				HostPort:  temporalHost,
				Namespace: viper.GetString("temporal-namespace"),
				Logger:    logger,
			}
			if temporalOAuthTokenURL != "" || temporalOAuthClientID != "" || temporalOAuthClientSecret != "" || len(temporalOAuthScopes) > 0 {
				clientCfg.OAuthTokenProvider = &workflows.OAuthTokenProviderConfig{
					TokenURL:     temporalOAuthTokenURL,
					ClientID:     temporalOAuthClientID,
					ClientSecret: temporalOAuthClientSecret,
					Scopes:       temporalOAuthScopes,
				}
			}
			var err error
			temporalClient, err = workflows.NewClient(ctx, clientCfg)
			if err != nil {
				logger.Error("failed to connect to Temporal", slog.Any("error", err))
				os.Exit(1)
			}
			defer temporalClient.Close()

			// Start Temporal worker
			workerCfg := workflows.DefaultWorkerConfig(db.New(database), logger)
			workerCfg.FedWikiFarmAPIURL = viper.GetString("fedwiki-farm-api-url")
			workerCfg.FedWikiAllowedDomains = viper.GetStringSlice("fedwiki-allowed-domains")
			workerCfg.FedWikiAdminToken = viper.GetString("fedwiki-admin-token")
			workerCfg.SupportURL = viper.GetString("support-url")

			worker, err := workflows.NewWorker(temporalClient, workerCfg)
			if err != nil {
				logger.Error("failed to create Temporal worker", slog.Any("error", err))
				os.Exit(1)
			}
			if err := worker.Start(); err != nil {
				logger.Error("failed to start Temporal worker", slog.Any("error", err))
				os.Exit(1)
			}
			defer worker.Stop()

			// Set up FedWiki site sync schedule if enabled
			if viper.GetBool("fedwiki-sync-enabled") {
				syncInterval := viper.GetDuration("fedwiki-sync-interval")
				if syncInterval == 0 {
					syncInterval = fedwiki.DefaultSyncInterval
				}
				scheduleManager := fedwiki.NewScheduleManager(temporalClient, logger)
				err := scheduleManager.EnsureSyncSchedule(ctx, fedwiki.ScheduleConfig{
					Interval:           syncInterval,
					DefaultUserID:      viper.GetInt64("fedwiki-sync-default-user-id"),
					TriggerImmediately: viper.GetBool("fedwiki-sync-trigger-immediately"),
				})
				if err != nil {
					logger.Error("failed to set up FedWiki sync schedule", slog.Any("error", err))
					// Non-fatal: continue without sync schedule
				}
			}
		} else {
			logger.Warn("Temporal not configured - FedWiki site provisioning will be unavailable")
		}

		// Create server config
		serverConfig := server.Config{
			Port:                  port,
			Env:                   env,
			CSRFSecret:            csrfSecret,
			Logger:                logger,
			DB:                    db.New(database), // Pass the sqlc Querier
			FedWikiFarmAPIURL:     viper.GetString("fedwiki-farm-api-url"),
			FedWikiAllowedDomains: viper.GetStringSlice("fedwiki-allowed-domains"),
			FedWikiSiteScheme:     viper.GetString("fedwiki-site-scheme"),
			FedWikiAdminToken:     viper.GetString("fedwiki-admin-token"),
			SupportURL:            viper.GetString("support-url"),
			TemporalClient:        temporalClient,
		}

		// Start the server
		if err := server.Start(ctx, serverConfig); err != nil {
			logger.Error("server failed to start", slog.Any("error", err))
		}
	},
}

func init() {
	// Register flags with Cobra
	// DO NOT SET DEFAULT VALUES HERE. Use viper.SetDefault() instead. https://github.com/spf13/viper/issues/671

	// General configuration
	startCmd.Flags().StringP("port", "p", "", "Port to listen on")
	startCmd.Flags().String("base-url", "", "Address at which the server is exposed")
	startCmd.Flags().String("env", "", "Environment (development/production)")
	startCmd.Flags().String("db-dsn", "", "Database DSN (e.g., ./member_console.db or file:/path/to/data.db?_foreign_keys=on)")
	startCmd.Flags().String("session-secret", "", "Secret key for session management (must be exactly 32 bytes)")
	startCmd.Flags().String("session-secret-file", "", "Path to file containing session secret key")
	startCmd.Flags().String("csrf-secret", "", "Secret key for CSRF protection (must be exactly 32 bytes)")
	startCmd.Flags().String("csrf-secret-file", "", "Path to file containing CSRF secret key")

	// OIDC configuration
	startCmd.Flags().String("oidc-sp-client-id", "", "OIDC Client ID")
	startCmd.Flags().String("oidc-idp-issuer-url", "", "OIDC Identity Provider Issuer URL")
	startCmd.Flags().String("oidc-sp-client-secret", "", "OIDC Client Secret")
	startCmd.Flags().String("oidc-sp-client-secret-file", "", "Path to file containing OIDC Client Secret")

	// FedWiki configuration
	startCmd.Flags().String("fedwiki-farm-api-url", "", "URL of the FedWiki farm API endpoint (e.g., https://admin.wiki.example.com)")
	startCmd.Flags().StringSlice("fedwiki-allowed-domains", nil, "Domains where users can create FedWiki sites (e.g., wiki.example.com,wiki2.example.com)")
	startCmd.Flags().String("fedwiki-site-scheme", "", "URL scheme for FedWiki sites (http or https)")
	startCmd.Flags().String("fedwiki-admin-token", "", "FedWiki admin access token for farmmanager API")
	startCmd.Flags().String("fedwiki-admin-token-file", "", "Path to file containing FedWiki admin access token")

	// FedWiki sync configuration
	startCmd.Flags().Bool("fedwiki-sync-enabled", false, "Enable periodic sync of sites from FedWiki farm")
	startCmd.Flags().Duration("fedwiki-sync-interval", time.Hour, "Interval between FedWiki site syncs")
	startCmd.Flags().Int64("fedwiki-sync-default-user-id", 1, "Default user ID for orphaned sites during sync")
	startCmd.Flags().Bool("fedwiki-sync-trigger-immediately", true, "Run sync immediately on startup")

	// Support configuration
	startCmd.Flags().String("support-url", "", "URL for users to get support (shown in error messages)")

	// Temporal configuration
	startCmd.Flags().String("temporal-host", "", "Temporal server host:port (e.g., localhost:7233)")
	startCmd.Flags().String("temporal-namespace", "", "Temporal namespace")
	startCmd.Flags().String("temporal-oauth-token-url", "", "OAuth2 token endpoint for Temporal authentication")
	startCmd.Flags().String("temporal-oauth-client-id", "", "OAuth2 client ID for Temporal authentication")
	startCmd.Flags().String("temporal-oauth-client-secret", "", "OAuth2 client secret for Temporal authentication")
	startCmd.Flags().String("temporal-oauth-client-secret-file", "", "Path to file containing Temporal OAuth2 client secret")
	startCmd.Flags().StringSlice("temporal-oauth-scopes", nil, "OAuth2 scopes for Temporal authentication (comma-separated)")

	// Bind all flags to Viper
	viper.BindPFlags(startCmd.Flags())

	// Set default values
	viper.SetDefault("port", "8080")
	viper.SetDefault("env", "development")
	viper.SetDefault("db-dsn", "./member_console.db")
	viper.SetDefault("temporal-namespace", "default")
	viper.SetDefault("fedwiki-site-scheme", "https")
	viper.SetDefault("fedwiki-sync-enabled", false)
	viper.SetDefault("fedwiki-sync-interval", time.Hour)
	viper.SetDefault("fedwiki-sync-default-user-id", 1)
	viper.SetDefault("fedwiki-sync-trigger-immediately", true)

	// Add the command to the root command
	rootCmd.AddCommand(startCmd)
}

// loadFromFile reads a file and returns its contents as a trimmed string
func loadFromFile(path string) (string, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return "", err
	}
	return strings.TrimSpace(string(data)), nil
}