package main

import (
	"context"
	"errors"
	"log/slog"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	agenta2a "github.com/nomadcode/nomadcode-core/internal/adapters/a2a"
	"github.com/nomadcode/nomadcode-core/internal/adapters/jira"
	"github.com/nomadcode/nomadcode-core/internal/adapters/mattermost"
	modelopenai "github.com/nomadcode/nomadcode-core/internal/adapters/openai"
	"github.com/nomadcode/nomadcode-core/internal/adapters/plane"
	"github.com/nomadcode/nomadcode-core/internal/agent"
	"github.com/nomadcode/nomadcode-core/internal/authoring"
	"github.com/nomadcode/nomadcode-core/internal/config"
	"github.com/nomadcode/nomadcode-core/internal/db"
	"github.com/nomadcode/nomadcode-core/internal/gitoevents"
	"github.com/nomadcode/nomadcode-core/internal/gitosync"
	apphttp "github.com/nomadcode/nomadcode-core/internal/http"
	"github.com/nomadcode/nomadcode-core/internal/notification"
	"github.com/nomadcode/nomadcode-core/internal/protosocket"
	"github.com/nomadcode/nomadcode-core/internal/roadmapsyncpipeline"
	"github.com/nomadcode/nomadcode-core/internal/scheduler"
	"github.com/nomadcode/nomadcode-core/internal/storage"
	"github.com/nomadcode/nomadcode-core/internal/workflow"
)

func main() {
	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
	if err := run(logger); err != nil {
		logger.Error("server stopped", "error", err)
		os.Exit(1)
	}
}

func run(logger *slog.Logger) error {
	cfg := config.Load()

	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer stop()

	pool, err := db.NewPool(ctx, cfg.DatabaseURL)
	if err != nil {
		return err
	}
	defer pool.Close()

	store := storage.NewStore(pool)
	mattermostClient := mattermost.NewClient(mattermost.Config{
		BaseURL:   cfg.MattermostBaseURL,
		Token:     cfg.MattermostToken,
		ChannelID: cfg.MattermostChannelID,
	}, logger)
	planeClient := plane.NewClient(plane.Config{
		BaseURL: cfg.PlaneBaseURL,
		Token:   cfg.PlaneToken,
	}, logger)
	jiraClient := jira.NewClient(jira.Config{
		BaseURL:  cfg.JiraBaseURL,
		Email:    cfg.JiraEmail,
		APIToken: cfg.JiraAPIToken,
	}, logger)
	if cfg.JiraBaseURL != "" {
		logger.Info("jira adapter initialized", "base_url", cfg.JiraBaseURL)
	}
	protoSocketServer := protosocket.NewServer(protosocket.Config{
		HeartbeatIntervalSec: cfg.ProtoSocketHeartbeatIntervalSec,
		HeartbeatWaitSec:     cfg.ProtoSocketHeartbeatWaitSec,
	}, logger)

	notificationService := notification.NewService(
		logger,
		mattermost.NewTaskNotificationSink(mattermostClient),
		protosocket.NewTaskEventBroadcaster(protoSocketServer),
	)
	modelClient := modelopenai.NewClient(modelopenai.Config{
		BaseURL:              cfg.ModelBaseURL,
		APIKey:               cfg.ModelAPIKey,
		Model:                cfg.ModelName,
		ContextSize:          cfg.ModelContextSize,
		TimeoutSec:           cfg.ModelTimeoutSec,
		ModelResponsesStream: cfg.ModelResponsesStream,
	}, logger)

	var agentClient agent.Client
	if cfg.A2AEdgeURL != "" {
		agentClient = agenta2a.NewClient(agenta2a.Config{
			URL:        cfg.A2AEdgeURL,
			Token:      cfg.A2AToken,
			TimeoutSec: cfg.A2ATimeoutSec,
		}, logger)
		logger.Info("a2a edge input enabled", "url", cfg.A2AEdgeURL)
	}

	lifecycle := workflow.NewLifecycle(store, logger)

	// Plane-origin Milestone creation sync orchestrator. Jira is intentionally
	// not wired here; this slice handles the Plane projection path only. The
	// self-actor guard is active only when PLANE_SELF_ACTOR_ID is configured.
	creationSync := roadmapsyncpipeline.NewService(store, planeClient, cfg.PlaneSelfActorID)

	workflowService := workflow.NewService(store, nil, logger)

	identityWriter := authoring.NewLocalIdentityWriter()
	taskScheduler, err := scheduler.New(pool, lifecycle, notificationService, agentClient, modelClient, identityWriter, creationSync, workflowService, store, time.Duration(cfg.WorkflowTaskTimeoutSec)*time.Second, logger)
	if err != nil {
		return err
	}
	if err := taskScheduler.Migrate(ctx); err != nil {
		return err
	}
	if err := taskScheduler.Start(ctx); err != nil {
		return err
	}

	workflowService.SetEnqueuer(taskScheduler)

	// Build a shared Gito bridge when either the proto-socket runner or the HTTP
	// webhook consumer is enabled. Both share the same scanner/bridge assembly.
	var gitoBridge *gitosync.Bridge
	if cfg.GitoBranchEventsEnabled() || cfg.GitoWebhookConsumerEnabled() {
		var err error
		gitoBridge, err = newGitoBridge(cfg, planeClient, taskScheduler, logger)
		if err != nil {
			return err
		}
	}

	// Gito branch event consumer (proto-socket): drives Plane-origin Milestone
	// creation sync from a develop push. Started only when the endpoint, repo,
	// local develop checkout, and Todo state id are all configured; otherwise the
	// Core server behaves exactly as before. Cancelled with the root context on shutdown.
	if cfg.GitoBranchEventsEnabled() {
		gitoRunner, err := newGitoRunner(cfg, gitoBridge, logger)
		if err != nil {
			return err
		}
		reconnectingRunner := gitosync.NewReconnectingRunner(gitoRunner, logger)
		go func() {
			if err := reconnectingRunner.Run(ctx); err != nil {
				logger.Error("gito branch event runner stopped", "error", err)
			}
		}()
		logger.Info("gito branch event consumer enabled",
			"repo_id", cfg.GitoRepoID, "branch", cfg.GitoBranch)
	}
	projectBinder := apphttp.NewProjectBinder(store)
	handler := apphttp.NewHandler(
		pool,
		workflowService,
		projectBinder,
		logger,
		apphttp.WorkItemProvider{ID: "plane", Reader: planeClient},
		apphttp.WorkItemProvider{ID: "jira", Reader: jiraClient},
	)
	handler.SetPlaneWebhookSecret(cfg.PlaneWebhookSecret)
	handler.SetPlaneWebhookDispatchConfig(apphttp.PlaneWebhookDispatchConfig{
		WorkspaceID:     cfg.PlaneWorkspaceID,
		WorkspaceSlug:   cfg.PlaneWorkspaceSlug,
		BacklogStateID:  cfg.PlaneCreationBacklogStateID,
		AgentAssigneeID: cfg.PlaneAgentAssigneeID,
		SelfActorID:     cfg.PlaneSelfActorID,
	})
	if cfg.GitoWebhookConsumerEnabled() {
		handler.SetGitoWebhookConfig(apphttp.GitoWebhookConfig{
			Secret: cfg.GitoWebhookSecret,
			RepoID: cfg.GitoRepoID,
			Branch: cfg.GitoBranch,
		})
		handler.SetGitoBranchEventHandler(&gitoBridgeHTTPAdapter{bridge: gitoBridge})
		logger.Info("gito http webhook consumer enabled",
			"repo_id", cfg.GitoRepoID, "branch", cfg.GitoBranch)
	}

	protosocket.NewTaskChannels(workflowService).Register(protoSocketServer.Dispatcher())

	server := &http.Server{
		Addr:              cfg.HTTPAddr,
		Handler:           apphttp.NewRouter(handler, logger, apphttp.AuthConfig{Username: cfg.AuthUsername, Password: cfg.AuthPassword}, protoSocketServer, cfg.ProtoSocketPath),
		ReadHeaderTimeout: 5 * time.Second,
	}

	serverErr := make(chan error, 1)
	go func() {
		logger.Info("server listening", "addr", cfg.HTTPAddr, "env", cfg.AppEnv)
		if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			serverErr <- err
			return
		}
		serverErr <- nil
	}()

	select {
	case <-ctx.Done():
	case err := <-serverErr:
		if err != nil {
			return err
		}
	}

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	if err := server.Shutdown(shutdownCtx); err != nil {
		return err
	}
	if err := protoSocketServer.Close(); err != nil {
		return err
	}
	if err := taskScheduler.Stop(shutdownCtx); err != nil {
		return err
	}

	return nil
}

// newGitoBridge assembles the shared Gito bridge: an exec-backed develop scanner,
// the Plane work item reader, the scheduler enqueuer, and an in-memory
// duplicate-revision guard. Both the proto-socket runner and the HTTP webhook
// consumer call this and share the resulting bridge.
func newGitoBridge(cfg config.Config, reader *plane.Client, enqueuer *scheduler.Client, logger *slog.Logger) (*gitosync.Bridge, error) {
	scanner, err := gitosync.NewBranchRevisionScanner(gitosync.ExecCommandRunner{}, gitosync.ScannerConfig{
		DevelopRepoPath: cfg.GitoDevelopRepoPath,
		RemoteName:      cfg.GitoRemoteName,
		Branch:          cfg.GitoBranch,
	})
	if err != nil {
		return nil, err
	}
	return gitosync.NewBridge(scanner, reader, enqueuer, nil, gitosync.BridgeConfig{
		RepoID:      cfg.GitoRepoID,
		Branch:      cfg.GitoBranch,
		TodoStateID: cfg.RoadmapCreationTodoStateID,
		Tenant:      cfg.PlaneWorkspaceSlug,
		Project:     cfg.PlaneProjectID,
	}, logger)
}

// newGitoRunner wires a pre-built bridge into a proto-socket runner.
func newGitoRunner(cfg config.Config, bridge *gitosync.Bridge, logger *slog.Logger) (*gitoevents.Client, error) {
	return gitosync.NewRunner(cfg.GitoProtoSocketURL, cfg.GitoRepoID, cfg.GitoBranch, bridge, logger)
}

// gitoBridgeHTTPAdapter adapts *gitosync.Bridge to apphttp.GitoBranchEventHandler.
// The http package defines its own event struct to avoid an import cycle between
// internal/http → internal/gitoevents → internal/protosocket ← protosocket tests → internal/http.
type gitoBridgeHTTPAdapter struct {
	bridge *gitosync.Bridge
}

func (a *gitoBridgeHTTPAdapter) Handle(ctx context.Context, ev apphttp.GitoBranchUpdatedEvent) error {
	changedFiles := make([]gitoevents.ChangedFile, 0, len(ev.ChangedFiles))
	for _, f := range ev.ChangedFiles {
		changedFiles = append(changedFiles, gitoevents.ChangedFile{Path: f.Path, ChangeType: f.ChangeType})
	}
	return a.bridge.Handle(ctx, gitoevents.BranchUpdatedEvent{
		RepoID:       ev.RepoID,
		Branch:       ev.Branch,
		Before:       ev.Before,
		After:        ev.After,
		ChangedFiles: changedFiles,
	})
}