// Package main provides the entry point for the rdev API server.
//
// rdev (Remote Developer) provides a REST API for controlling Claude Code
// instances running in Kubernetes pods. External clients (Discord bots,
// CLI tools, etc.) connect via this API.
//
// Authentication:
//   - All endpoints (except /health, /ready, /docs) require X-API-Key header
//   - Admin key from RDEV_ADMIN_KEY env var for key management
//   - Create additional keys via POST /keys
//
// Endpoints:
//   - GET  /health              - Health check (no auth)
//   - GET  /ready               - Readiness check (no auth)
//   - GET  /docs                - Scalar API documentation (no auth)
//   - GET  /openapi.json        - OpenAPI 3.0 specification (no auth)
//   - GET  /keys                - List API keys
//   - POST /keys                - Create API key
//   - GET  /keys/{id}           - Get API key details
//   - DELETE /keys/{id}         - Revoke API key
//   - GET  /projects            - List available projects
//   - GET  /projects/{id}       - Get project details
//   - POST /projects/{id}/claude - Run Claude command
//   - POST /projects/{id}/shell  - Run shell command
//   - POST /projects/{id}/git    - Run git command
//   - GET  /projects/{id}/events - SSE stream for output
//   - GET  /projects/{id}/claude-config           - List commands/skills/agents
//   - GET  /projects/{id}/claude-config/commands  - List commands
//   - POST /projects/{id}/claude-config/commands  - Create command
//   - GET  /projects/{id}/claude-config/commands/{name} - Get command
//   - PUT  /projects/{id}/claude-config/commands/{name} - Update command
//   - DELETE /projects/{id}/claude-config/commands/{name} - Delete command
//     (same pattern for /skills and /agents)
package main

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

	"github.com/orchard9/rdev/internal/adapter/cloudflare"
	"github.com/orchard9/rdev/internal/adapter/deployer"
	"github.com/orchard9/rdev/internal/adapter/gitea"
	"github.com/orchard9/rdev/internal/adapter/kubernetes"
	"github.com/orchard9/rdev/internal/adapter/memory"
	"github.com/orchard9/rdev/internal/adapter/postgres"
	"github.com/orchard9/rdev/internal/auth"
	"github.com/orchard9/rdev/internal/db"
	"github.com/orchard9/rdev/internal/handlers"
	"github.com/orchard9/rdev/internal/metrics"
	"github.com/orchard9/rdev/internal/middleware"
	"github.com/orchard9/rdev/internal/service"
	"github.com/orchard9/rdev/internal/telemetry"
	"github.com/orchard9/rdev/internal/webhook"
	"github.com/orchard9/rdev/internal/worker"
	"github.com/orchard9/rdev/pkg/api"
)

func main() {
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
		Level: slog.LevelInfo,
	}))

	// Initialize telemetry (OpenTelemetry)
	telCfg := telemetry.DefaultConfig()
	telCfg.Logger = logger
	tel, err := telemetry.New(context.Background(), telCfg)
	if err != nil {
		logger.Error("failed to initialize telemetry", "error", err)
		os.Exit(1)
	}

	// Load configuration from environment
	cfg := loadConfig()

	// Initialize database with auto-migrations
	database, err := db.New(db.Config{
		Host:     cfg.DBHost,
		Port:     cfg.DBPort,
		User:     cfg.DBUser,
		Password: cfg.DBPassword,
		Database: cfg.DBName,
		SSLMode:  cfg.DBSSLMode,
	}, logger)
	if err != nil {
		logger.Error("failed to connect to database", "error", err)
		os.Exit(1)
	}
	defer func() { _ = database.Close() }()

	// Initialize auth service
	authService := auth.NewService(database.DB, cfg.AdminKey)

	// Create adapters (dependency injection)
	namespace := getEnv("K8S_NAMESPACE", "rdev")

	// Initialize K8s client for dynamic project discovery
	// Falls back gracefully if K8s is unavailable (e.g., local development)
	k8sClient := kubernetes.NewClientOrNil(kubernetes.ClientConfig{
		Namespace:  namespace,
		Kubeconfig: os.Getenv("KUBECONFIG"),
	})
	if k8sClient != nil {
		logger.Info("k8s client initialized, dynamic project discovery enabled")
	} else {
		logger.Warn("k8s client unavailable, using hardcoded fallback projects")
	}

	projectRepo := kubernetes.NewProjectRepositoryWithClient(namespace, k8sClient, logger)
	k8sExecutor := kubernetes.NewExecutor(namespace)
	streamPub := memory.NewStreamPublisher()

	// Start watching for project pod changes if K8s client is available
	if k8sClient != nil {
		if err := projectRepo.StartWatching(context.Background()); err != nil {
			logger.Warn("failed to start project watcher", "error", err)
		}
	}

	// Initialize audit logger
	auditLogger := postgres.NewAuditLogger(database.DB)

	// Initialize rate limiter
	rateLimiter := postgres.NewRateLimiter(database.DB)
	stopRateLimitCleanup := rateLimiter.StartCleanupWorker(context.Background(), 5*time.Minute)

	// Initialize command queue
	commandQueue := postgres.NewCommandQueueRepository(database.DB)

	// Initialize webhook repository and dispatcher
	webhookRepo := postgres.NewWebhookRepository(database.DB)
	webhookDispatcher := webhook.NewDispatcher(webhookRepo, &webhook.DispatcherConfig{
		WorkerCount:  10,
		MaxRetries:   3,
		Timeout:      30 * time.Second,
		RetryBackoff: 5 * time.Second,
		Logger:       logger,
	})
	if err := webhookDispatcher.Start(); err != nil {
		logger.Error("failed to start webhook dispatcher", "error", err)
		os.Exit(1)
	}

	// Initialize infrastructure adapters (optional - only if configured)
	var giteaClient *gitea.Client
	if cfg.GiteaToken != "" && cfg.GiteaURL != "" {
		var err error
		giteaClient, err = gitea.NewClient(cfg.GiteaURL, cfg.GiteaToken, cfg.GiteaDefaultOrg)
		if err != nil {
			logger.Warn("failed to initialize gitea client", "error", err)
		} else {
			logger.Info("gitea client initialized", "url", cfg.GiteaURL, "org", cfg.GiteaDefaultOrg)
		}
	}

	var dnsClient *cloudflare.Client
	if cfg.CloudflareToken != "" && cfg.CloudflareZoneID != "" {
		dnsClient = cloudflare.NewClient(cfg.CloudflareToken, cfg.CloudflareZoneID, cfg.DefaultDomain)
		logger.Info("cloudflare DNS client initialized", "domain", cfg.DefaultDomain)
	}

	var deployerAdapter *deployer.Deployer
	if k8sClient != nil {
		deployerAdapter = deployer.NewDeployer(k8sClient, deployer.Config{
			Namespace:       cfg.DeployNamespace,
			IngressClass:    "traefik",
			TLSIssuer:       cfg.DeployTLSIssuer,
			DefaultDomain:   cfg.DefaultDomain,
			DefaultReplicas: 1,
		})
		logger.Info("deployer initialized", "namespace", cfg.DeployNamespace)
	}

	// Create services
	projectService := service.NewProjectService(projectRepo, k8sExecutor, streamPub).
		WithAuditLogger(auditLogger).
		WithCommandQueue(commandQueue).
		WithWebhookDispatcher(webhookDispatcher)

	// Create app
	app := api.New("rdev-api",
		api.WithPort(cfg.Port),
		api.WithLogger(logger),
	)

	// Add telemetry middleware (first to capture all requests)
	app.Use(telemetry.Middleware(telCfg.ServiceName))

	// Add metrics middleware (before auth to track all requests)
	app.Use(metrics.Middleware)

	// Add auth middleware (skips /health, /ready, /docs, /openapi.json, /metrics)
	app.Use(auth.Middleware(authService))

	// Add rate limiting middleware (after auth, so we have API key context)
	rateLimitCfg := middleware.DefaultRateLimitConfig()
	rateLimitCfg.Limiter = rateLimiter
	app.Use(middleware.RateLimitMiddleware(rateLimitCfg))

	// Register metrics endpoint (no auth required)
	app.Router().Handle("/metrics", metrics.Handler())

	// Initialize handlers
	projectsHandler := handlers.NewProjectsHandlerWithService(projectService)
	keysHandler := handlers.NewKeysHandler(authService)
	claudeConfigHandler := handlers.NewClaudeConfigHandlerWithService(projectService, projectRepo, k8sExecutor)
	auditHandler := handlers.NewAuditHandler(auditLogger)
	queueHandler := handlers.NewQueueHandler(commandQueue, projectRepo)
	webhookHandler := handlers.NewWebhookHandler(webhookRepo, projectRepo)

	// Initialize infrastructure handler (for threesix.ai git/deploy/dns)
	infraHandler := handlers.NewInfrastructureHandler(
		giteaClient,
		dnsClient,
		deployerAdapter,
		projectRepo,
		handlers.InfrastructureConfig{
			DefaultGitOwner: cfg.GiteaDefaultOrg,
			DefaultDomain:   cfg.DefaultDomain,
		},
	)

	// Initialize project infrastructure service (orchestrates full project lifecycle)
	projectInfraService := service.NewProjectInfraService(
		database.DB,
		giteaClient,
		dnsClient,
		deployerAdapter,
		service.ProjectInfraConfig{
			DefaultGitOwner: cfg.GiteaDefaultOrg,
			DefaultDomain:   cfg.DefaultDomain,
			ClusterIP:       cfg.ClusterIP,
			Logger:          logger,
		},
	)

	// Initialize project management handler
	projectMgmtHandler := handlers.NewProjectManagementHandler(projectInfraService)

	// Initialize Woodpecker webhook handler (for CI/CD auto-deploy)
	woodpeckerHandler := handlers.NewWoodpeckerWebhookHandler(
		deployerAdapter,
		dnsClient,
		handlers.WoodpeckerWebhookConfig{
			WebhookSecret: cfg.WoodpeckerWebhookSecret,
			DefaultDomain: cfg.DefaultDomain,
			RegistryURL:   cfg.RegistryURL,
			ClusterIP:     cfg.ClusterIP,
			Logger:        logger,
		},
	)

	// Register routes
	projectsHandler.Mount(app.Router())
	keysHandler.Mount(app.Router())
	claudeConfigHandler.Mount(app.Router())
	auditHandler.Mount(app.Router())
	queueHandler.Mount(app.Router())
	webhookHandler.Mount(app.Router())
	infraHandler.Mount(app.Router())
	projectMgmtHandler.Mount(app.Router())
	woodpeckerHandler.Mount(app.Router())

	// Start queue processor worker
	queueProcessor := worker.NewQueueProcessor(
		commandQueue,
		k8sExecutor,
		projectRepo,
		streamPub,
		&worker.QueueProcessorConfig{
			PollPeriod: 5 * time.Second,
			Logger:     logger,
		},
	).WithWebhookDispatcher(webhookDispatcher)
	if err := queueProcessor.Start(); err != nil {
		logger.Error("failed to start queue processor", "error", err)
		os.Exit(1)
	}

	// Enable API documentation
	app.EnableDocs(buildOpenAPISpec())

	// Cleanup on shutdown
	app.OnShutdown(func(ctx context.Context) error {
		// Stop queue processor
		queueProcessor.Stop()

		// Stop webhook dispatcher
		webhookDispatcher.Stop()

		// Stop project watcher
		projectRepo.StopWatching()

		// Stop rate limit cleanup worker
		stopRateLimitCleanup()

		// Shutdown telemetry (flush pending traces)
		if err := tel.Shutdown(ctx); err != nil {
			logger.Error("telemetry shutdown error", "error", err)
		}

		return database.Close()
	})

	logger.Info("rdev-api starting",
		"port", cfg.Port,
		"db_host", cfg.DBHost,
		"admin_key_set", cfg.AdminKey != "",
	)

	app.Run()
}

// Config holds application configuration.
type Config struct {
	Port       int
	DBHost     string
	DBPort     int
	DBUser     string
	DBPassword string
	DBName     string
	DBSSLMode  string
	AdminKey   string

	// Infrastructure adapters (threesix.ai)
	GiteaURL                string
	GiteaToken              string
	GiteaDefaultOrg         string
	CloudflareToken         string
	CloudflareZoneID        string
	DefaultDomain           string
	DeployNamespace         string
	DeployTLSIssuer         string
	ClusterIP               string
	RegistryURL             string
	WoodpeckerWebhookSecret string
}

func loadConfig() Config {
	port := 8080
	if v := os.Getenv("PORT"); v != "" {
		if p, err := strconv.Atoi(v); err == nil {
			port = p
		}
	}

	dbPort := 5432
	if v := os.Getenv("DB_PORT"); v != "" {
		if p, err := strconv.Atoi(v); err == nil {
			dbPort = p
		}
	}

	return Config{
		Port:       port,
		DBHost:     getEnv("DB_HOST", "postgres.databases.svc"),
		DBPort:     dbPort,
		DBUser:     getEnv("DB_USER", "appuser"),
		DBPassword: os.Getenv("DB_PASSWORD"),
		DBName:     getEnv("DB_NAME", "rdev"),
		DBSSLMode:  getEnv("DB_SSL_MODE", "disable"),
		AdminKey:   os.Getenv("RDEV_ADMIN_KEY"),

		// Infrastructure adapters
		GiteaURL:                getEnv("GITEA_URL", "https://git.threesix.ai"),
		GiteaToken:              os.Getenv("GITEA_TOKEN"),
		GiteaDefaultOrg:         getEnv("GITEA_DEFAULT_ORG", "threesix"),
		CloudflareToken:         os.Getenv("CLOUDFLARE_API_TOKEN"),
		CloudflareZoneID:        os.Getenv("CLOUDFLARE_ZONE_ID"),
		DefaultDomain:           getEnv("DEFAULT_DOMAIN", "threesix.ai"),
		DeployNamespace:         getEnv("DEPLOY_NAMESPACE", "projects"),
		DeployTLSIssuer:         getEnv("DEPLOY_TLS_ISSUER", "letsencrypt-threesix"),
		ClusterIP:               getEnv("CLUSTER_IP", "208.122.204.172"),
		RegistryURL:             getEnv("REGISTRY_URL", "zot.threesix.svc.cluster.local:5000"),
		WoodpeckerWebhookSecret: os.Getenv("WOODPECKER_WEBHOOK_SECRET"),
	}
}

func getEnv(key, defaultVal string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return defaultVal
}