package webhook_test

import (
	"context"
	"encoding/json"
	"os"
	"path/filepath"
	"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"
	"git.eeqj.de/sneak/upaas/internal/service/webhook"
)

type testDeps struct {
	logger *logger.Logger
	config *config.Config
	db     *database.Database
	tmpDir string
}

func setupTestDeps(t *testing.T) *testDeps {
	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)

	return &testDeps{logger: loggerInst, config: cfg, db: dbInst, tmpDir: tmpDir}
}

func setupTestService(t *testing.T) (*webhook.Service, *database.Database, func()) {
	t.Helper()

	deps := setupTestDeps(t)

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

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

	deploySvc, err := deploy.New(fx.Lifecycle(nil), deploy.ServiceParams{
		Logger: deps.logger, Config: deps.config, Database: deps.db, Docker: dockerClient, Notify: notifySvc,
	})
	require.NoError(t, err)

	svc, err := webhook.New(fx.Lifecycle(nil), webhook.ServiceParams{
		Logger: deps.logger, Database: deps.db, Deploy: deploySvc,
	})
	require.NoError(t, err)

	// t.TempDir() automatically cleans up after test
	return svc, deps.db, func() {}
}

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

	app := models.NewApp(dbInst)
	app.ID = "test-app-id"
	app.Name = "test-app"
	app.RepoURL = "git@gitea.example.com:user/repo.git"
	app.Branch = branch
	app.DockerfilePath = "Dockerfile"
	app.WebhookSecret = "webhook-secret-123"
	app.SSHPrivateKey = "private-key"
	app.SSHPublicKey = "public-key"
	app.Status = models.AppStatusPending

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

	return app
}

//nolint:funlen // table-driven test with comprehensive test cases
func TestExtractBranch(testingT *testing.T) {
	testingT.Parallel()

	tests := []struct {
		name     string
		ref      string
		expected string
	}{
		{
			name:     "extracts main branch",
			ref:      "refs/heads/main",
			expected: "main",
		},
		{
			name:     "extracts feature branch",
			ref:      "refs/heads/feature/new-feature",
			expected: "feature/new-feature",
		},
		{
			name:     "extracts develop branch",
			ref:      "refs/heads/develop",
			expected: "develop",
		},
		{
			name:     "returns raw ref if no prefix",
			ref:      "main",
			expected: "main",
		},
		{
			name:     "handles empty ref",
			ref:      "",
			expected: "",
		},
		{
			name:     "handles partial prefix",
			ref:      "refs/heads/",
			expected: "",
		},
	}

	for _, testCase := range tests {
		testingT.Run(testCase.name, func(t *testing.T) {
			t.Parallel()

			// We test via HandleWebhook since extractBranch is not exported.
			// The test verifies behavior indirectly through the webhook event's branch.
			svc, dbInst, cleanup := setupTestService(t)
			defer cleanup()

			app := createTestApp(t, dbInst, testCase.expected)

			payload := []byte(`{"ref": "` + testCase.ref + `"}`)

			err := svc.HandleWebhook(context.Background(), app, "push", payload)
			require.NoError(t, err)

			// Allow async deployment goroutine to complete before test cleanup
			time.Sleep(100 * time.Millisecond)

			events, err := app.GetWebhookEvents(context.Background(), 10)
			require.NoError(t, err)
			require.Len(t, events, 1)

			assert.Equal(t, testCase.expected, events[0].Branch)
		})
	}
}

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

	svc, dbInst, cleanup := setupTestService(t)
	defer cleanup()

	app := createTestApp(t, dbInst, "main")

	payload := []byte(`{
		"ref": "refs/heads/main",
		"before": "0000000000000000000000000000000000000000",
		"after": "abc123def456",
		"repository": {
			"full_name": "user/repo",
			"clone_url": "https://gitea.example.com/user/repo.git",
			"ssh_url": "git@gitea.example.com:user/repo.git"
		},
		"pusher": {"username": "testuser", "email": "test@example.com"},
		"commits": [{"id": "abc123def456", "message": "Test commit",
			"author": {"name": "Test User", "email": "test@example.com"}}]
	}`)

	err := svc.HandleWebhook(context.Background(), app, "push", payload)
	require.NoError(t, err)

	// Allow async deployment goroutine to complete before test cleanup
	time.Sleep(100 * time.Millisecond)

	events, err := app.GetWebhookEvents(context.Background(), 10)
	require.NoError(t, err)
	require.Len(t, events, 1)

	event := events[0]
	assert.Equal(t, "push", event.EventType)
	assert.Equal(t, "main", event.Branch)
	assert.True(t, event.Matched)
	assert.Equal(t, "abc123def456", event.CommitSHA.String)
}

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

	svc, dbInst, cleanup := setupTestService(t)
	defer cleanup()

	app := createTestApp(t, dbInst, "main")

	payload := []byte(`{"ref": "refs/heads/develop", "after": "def789ghi012"}`)

	err := svc.HandleWebhook(context.Background(), app, "push", payload)
	require.NoError(t, err)

	events, err := app.GetWebhookEvents(context.Background(), 10)
	require.NoError(t, err)
	require.Len(t, events, 1)

	assert.Equal(t, "develop", events[0].Branch)
	assert.False(t, events[0].Matched)
}

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

	svc, dbInst, cleanup := setupTestService(t)
	defer cleanup()

	app := createTestApp(t, dbInst, "main")

	err := svc.HandleWebhook(context.Background(), app, "push", []byte(`{invalid json}`))
	require.NoError(t, err)

	events, err := app.GetWebhookEvents(context.Background(), 10)
	require.NoError(t, err)
	require.Len(t, events, 1)
}

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

	svc, dbInst, cleanup := setupTestService(t)
	defer cleanup()

	app := createTestApp(t, dbInst, "main")

	err := svc.HandleWebhook(context.Background(), app, "push", []byte(`{}`))
	require.NoError(t, err)

	events, err := app.GetWebhookEvents(context.Background(), 10)
	require.NoError(t, err)
	require.Len(t, events, 1)
	assert.False(t, events[0].Matched)
}

func TestGiteaPushPayloadParsing(testingT *testing.T) {
	testingT.Parallel()

	testingT.Run("parses full payload", func(t *testing.T) {
		t.Parallel()

		payload := []byte(`{
			"ref": "refs/heads/main",
			"before": "0000000000000000000000000000000000000000",
			"after": "abc123def456789",
			"repository": {
				"full_name": "myorg/myrepo",
				"clone_url": "https://gitea.example.com/myorg/myrepo.git",
				"ssh_url": "git@gitea.example.com:myorg/myrepo.git"
			},
			"pusher": {
				"username": "developer",
				"email": "dev@example.com"
			},
			"commits": [
				{
					"id": "abc123def456789",
					"message": "Fix bug in feature",
					"author": {
						"name": "Developer",
						"email": "dev@example.com"
					}
				},
				{
					"id": "def456789abc123",
					"message": "Add tests",
					"author": {
						"name": "Developer",
						"email": "dev@example.com"
					}
				}
			]
		}`)

		var pushPayload webhook.GiteaPushPayload

		err := json.Unmarshal(payload, &pushPayload)
		require.NoError(t, err)

		assert.Equal(t, "refs/heads/main", pushPayload.Ref)
		assert.Equal(t, "abc123def456789", pushPayload.After)
		assert.Equal(t, "myorg/myrepo", pushPayload.Repository.FullName)
		assert.Equal(
			t,
			"git@gitea.example.com:myorg/myrepo.git",
			pushPayload.Repository.SSHURL,
		)
		assert.Equal(t, "developer", pushPayload.Pusher.Username)
		assert.Len(t, pushPayload.Commits, 2)
		assert.Equal(t, "Fix bug in feature", pushPayload.Commits[0].Message)
	})
}

// TestSetupTestService verifies the test helper creates a working test service.
func TestSetupTestService(testingT *testing.T) {
	testingT.Parallel()

	testingT.Run("creates working test service", func(t *testing.T) {
		t.Parallel()

		svc, dbInst, cleanup := setupTestService(t)
		defer cleanup()

		require.NotNil(t, svc)
		require.NotNil(t, dbInst)

		// Verify database is working
		tmpDir := filepath.Dir(dbInst.Path())
		_, err := os.Stat(tmpDir)
		require.NoError(t, err)
	})
}