package deploy_test

import (
	"context"
	"errors"
	"sync"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"go.uber.org/fx"

	"git.eeqj.de/sneak/upaas/internal/config"
	"git.eeqj.de/sneak/upaas/internal/database"
	"git.eeqj.de/sneak/upaas/internal/docker"
	"git.eeqj.de/sneak/upaas/internal/globals"
	"git.eeqj.de/sneak/upaas/internal/logger"
	"git.eeqj.de/sneak/upaas/internal/models"
	"git.eeqj.de/sneak/upaas/internal/service/deploy"
	"git.eeqj.de/sneak/upaas/internal/service/notify"
)

func setupDeployService(t *testing.T) (*deploy.Service, *database.Database) {
	t.Helper()

	tmpDir := t.TempDir()

	globals.SetAppname("upaas-test")
	globals.SetVersion("test")

	globalsInst, err := globals.New(fx.Lifecycle(nil))
	require.NoError(t, err)

	loggerInst, err := logger.New(fx.Lifecycle(nil), logger.Params{Globals: globalsInst})
	require.NoError(t, err)

	cfg := &config.Config{Port: 8080, DataDir: tmpDir, SessionSecret: "test-secret-key-at-least-32-chars"}

	dbInst, err := database.New(fx.Lifecycle(nil), database.Params{Logger: loggerInst, Config: cfg})
	require.NoError(t, err)

	dockerClient, err := docker.New(fx.Lifecycle(nil), docker.Params{Logger: loggerInst, Config: cfg})
	require.NoError(t, err)

	notifySvc, err := notify.New(fx.Lifecycle(nil), notify.ServiceParams{Logger: loggerInst})
	require.NoError(t, err)

	svc, err := deploy.New(fx.Lifecycle(nil), deploy.ServiceParams{
		Logger: loggerInst, Config: cfg, Database: dbInst, Docker: dockerClient, Notify: notifySvc,
	})
	require.NoError(t, err)

	return svc, dbInst
}

func createDeployTestApp(t *testing.T, dbInst *database.Database) *models.App {
	t.Helper()

	app := models.NewApp(dbInst)
	app.ID = "test-cancel-app"
	app.Name = "test-cancel-app"
	app.RepoURL = "git@example.com:user/repo.git"
	app.Branch = "main"
	app.DockerfilePath = "Dockerfile"
	app.SSHPrivateKey = "private-key"
	app.SSHPublicKey = "public-key"
	app.Status = models.AppStatusPending

	err := app.Save(context.Background())
	require.NoError(t, err)

	return app
}

func TestConcurrentDeploysOnSameApp(t *testing.T) {
	t.Parallel()

	svc, dbInst := setupDeployService(t)
	app := createDeployTestApp(t, dbInst)

	// Run two deploys concurrently - both will fail (no docker) but we verify
	// the lock mechanism works (no panics, no data races)
	var wg sync.WaitGroup

	results := make([]error, 2)

	for i := range 2 {
		wg.Add(1)

		go func(idx int) {
			defer wg.Done()

			results[idx] = svc.Deploy(context.Background(), app, nil)
		}(i)
	}

	wg.Wait()

	// At least one should have run (and failed due to docker not connected)
	// The other either ran too or got ErrDeploymentInProgress
	gotInProgress := false
	gotOther := false

	for _, err := range results {
		require.Error(t, err)

		if errors.Is(err, deploy.ErrDeploymentInProgress) {
			gotInProgress = true
		} else {
			gotOther = true
		}
	}

	// At least one must have actually attempted the deploy
	assert.True(t, gotOther, "at least one deploy should have attempted execution")

	// If timing worked out, one should have been rejected
	// (but this is racy - both might complete sequentially)
	_ = gotInProgress
}

func TestCancelAppDeployReturnsFalseWhenNoDeploy(t *testing.T) {
	t.Parallel()

	svc, _ := setupDeployService(t)

	// No deploy in progress, should return false
	cancelled := svc.CancelAppDeploy("nonexistent-app")
	assert.False(t, cancelled)
}

func TestCancelAppDeployCancelsInProgressDeploy(t *testing.T) {
	t.Parallel()

	svc, dbInst := setupDeployService(t)
	app := createDeployTestApp(t, dbInst)

	deployStarted := make(chan struct{})
	deployDone := make(chan error, 1)

	// Start a deploy that will hold the lock
	go func() {
		// Signal when deploy starts (will acquire lock quickly)
		close(deployStarted)

		deployDone <- svc.Deploy(context.Background(), app, nil)
	}()

	<-deployStarted
	// Give it time to acquire the lock and register the cancel func
	time.Sleep(100 * time.Millisecond)

	// Cancel should work if deploy is still in progress
	_ = svc.CancelAppDeploy(app.ID)

	// Wait for deploy to finish
	select {
	case <-deployDone:
		// Deploy finished (either cancelled or failed for other reason)
	case <-time.After(5 * time.Second):
		t.Fatal("deploy did not finish after cancellation")
	}
}

func TestErrDeployCancelledExists(t *testing.T) {
	t.Parallel()

	// Verify the sentinel error exists
	require.Error(t, deploy.ErrDeployCancelled)
	assert.Equal(t, "deployment cancelled by newer deploy", deploy.ErrDeployCancelled.Error())
}