package auth_test

import (
	"context"
	"path/filepath"
	"testing"

	"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/globals"
	"git.eeqj.de/sneak/upaas/internal/logger"
	"git.eeqj.de/sneak/upaas/internal/service/auth"
)

func setupTestService(t *testing.T) (*auth.Service, func()) {
	t.Helper()

	// Create temp directory
	tmpDir := t.TempDir()

	// Set up globals
	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)

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

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

	// Connect database manually for tests
	dbPath := filepath.Join(tmpDir, "upaas.db")
	cfg.DataDir = tmpDir
	_ = dbPath // database will create this

	// Create service
	svc, err := auth.New(fx.Lifecycle(nil), auth.ServiceParams{
		Logger:   loggerInst,
		Config:   cfg,
		Database: dbInst,
	})
	require.NoError(t, err)

	// t.TempDir() automatically cleans up after test
	cleanup := func() {}

	return svc, cleanup
}

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

	testingT.Run("hashes password successfully", func(t *testing.T) {
		t.Parallel()

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

		hash, err := svc.HashPassword("testpassword")
		require.NoError(t, err)
		assert.NotEmpty(t, hash)
		assert.NotEqual(t, "testpassword", hash)
		assert.Contains(t, hash, "$") // salt$hash format
	})

	testingT.Run("produces different hashes for same password", func(t *testing.T) {
		t.Parallel()

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

		hash1, err := svc.HashPassword("testpassword")
		require.NoError(t, err)

		hash2, err := svc.HashPassword("testpassword")
		require.NoError(t, err)

		assert.NotEqual(t, hash1, hash2) // Different salts
	})
}

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

	testingT.Run("verifies correct password", func(t *testing.T) {
		t.Parallel()

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

		hash, err := svc.HashPassword("correctpassword")
		require.NoError(t, err)

		valid := svc.VerifyPassword(hash, "correctpassword")
		assert.True(t, valid)
	})

	testingT.Run("rejects incorrect password", func(t *testing.T) {
		t.Parallel()

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

		hash, err := svc.HashPassword("correctpassword")
		require.NoError(t, err)

		valid := svc.VerifyPassword(hash, "wrongpassword")
		assert.False(t, valid)
	})

	testingT.Run("rejects empty password", func(t *testing.T) {
		t.Parallel()

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

		hash, err := svc.HashPassword("correctpassword")
		require.NoError(t, err)

		valid := svc.VerifyPassword(hash, "")
		assert.False(t, valid)
	})

	testingT.Run("rejects invalid hash format", func(t *testing.T) {
		t.Parallel()

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

		valid := svc.VerifyPassword("invalid-hash", "password")
		assert.False(t, valid)
	})
}

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

	testingT.Run("returns true when no users exist", func(t *testing.T) {
		t.Parallel()

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

		required, err := svc.IsSetupRequired(context.Background())
		require.NoError(t, err)
		assert.True(t, required)
	})
}

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

	testingT.Run("creates user successfully", func(t *testing.T) {
		t.Parallel()

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

		user, err := svc.CreateUser(context.Background(), "admin", "password123")
		require.NoError(t, err)
		require.NotNil(t, user)

		assert.Equal(t, "admin", user.Username)
		assert.NotEmpty(t, user.PasswordHash)
		assert.NotZero(t, user.ID)
	})

	testingT.Run("rejects duplicate user", func(t *testing.T) {
		t.Parallel()

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

		_, err := svc.CreateUser(context.Background(), "admin", "password123")
		require.NoError(t, err)

		_, err = svc.CreateUser(context.Background(), "admin2", "password456")
		assert.ErrorIs(t, err, auth.ErrUserExists)
	})
}

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

	testingT.Run("authenticates valid credentials", func(t *testing.T) {
		t.Parallel()

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

		_, err := svc.CreateUser(context.Background(), "admin", "password123")
		require.NoError(t, err)

		user, err := svc.Authenticate(context.Background(), "admin", "password123")
		require.NoError(t, err)
		require.NotNil(t, user)
		assert.Equal(t, "admin", user.Username)
	})

	testingT.Run("rejects invalid password", func(t *testing.T) {
		t.Parallel()

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

		_, err := svc.CreateUser(context.Background(), "admin", "password123")
		require.NoError(t, err)

		_, err = svc.Authenticate(context.Background(), "admin", "wrongpassword")
		assert.ErrorIs(t, err, auth.ErrInvalidCredentials)
	})

	testingT.Run("rejects unknown user", func(t *testing.T) {
		t.Parallel()

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

		_, err := svc.Authenticate(context.Background(), "nonexistent", "password")
		assert.ErrorIs(t, err, auth.ErrInvalidCredentials)
	})
}