package tests

import (
	"context"
	"os"
	"os/exec"
	"path/filepath"
	"testing"
	"time"

	tests "github.com/jfraeys/fetch_ml/tests/fixtures"
)

// TestPodmanIntegration tests podman workflow with examples
func TestPodmanIntegration(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping podman integration test in short mode")
	}

	// Check if podman is available
	if _, err := exec.LookPath("podman"); err != nil {
		t.Skip("Podman not available, skipping integration test")
	}

	// Check if podman daemon is running
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	podmanCheck := exec.CommandContext(ctx, "podman", "info")
	if err := podmanCheck.Run(); err != nil {
		t.Skip("Podman daemon not running, skipping integration test")
	}

	// Determine project root (two levels up from tests/e2e)
	projectRoot, err := filepath.Abs(filepath.Join("..", ".."))
	if err != nil {
		t.Fatalf("Failed to resolve project root: %v", err)
	}

	// Test build
	t.Run("BuildContainer", func(t *testing.T) {
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
		defer cancel()

		cmd := exec.CommandContext(ctx, "podman", "build",
			"-f", filepath.Join("podman", "secure-ml-runner.podfile"),
			"-t", "secure-ml-runner:test",
			"podman")

		cmd.Dir = projectRoot
		t.Logf("Building container with command: %v", cmd)
		t.Logf("Current directory: %s", cmd.Dir)
		output, err := cmd.CombinedOutput()
		if err != nil {
			t.Fatalf("Failed to build container: %v\nOutput: %s", err, string(output))
		}

		t.Logf("Container build successful")
	})

	// Test execution with examples
	t.Run("ExecuteExample", func(t *testing.T) {
		// Use fixtures for examples directory operations
		examplesDir := tests.NewExamplesDir(filepath.Join("..", "fixtures", "examples"))
		project := "standard_ml_project"

		// Create temporary workspace
		tempDir := t.TempDir()
		workspaceDir := filepath.Join(tempDir, "workspace")
		resultsDir := filepath.Join(tempDir, "results")

		// Ensure workspace and results directories exist
		if err := os.MkdirAll(workspaceDir, 0755); err != nil {
			t.Fatalf("Failed to create workspace directory: %v", err)
		}
		if err := os.MkdirAll(resultsDir, 0755); err != nil {
			t.Fatalf("Failed to create results directory: %v", err)
		}

		// Copy example to workspace using fixtures
		dstDir := filepath.Join(workspaceDir, project)

		if err := examplesDir.CopyProject(project, dstDir); err != nil {
			t.Fatalf("Failed to copy example project: %v (dst: %s)", err, dstDir)
		}

		// Run container with example
		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
		defer cancel()

		// Pass script arguments via --args flag
		// The --args flag collects all remaining arguments after it
		cmd := exec.CommandContext(ctx, "podman", "run", "--rm",
			"--security-opt", "no-new-privileges",
			"--cap-drop", "ALL",
			"--memory", "2g",
			"--cpus", "1",
			"--userns", "keep-id",
			"-v", workspaceDir+":/workspace:rw",
			"-v", resultsDir+":/workspace/results:rw",
			"secure-ml-runner:test",
			"--workspace", "/workspace/"+project,
			"--requirements", "/workspace/"+project+"/requirements.txt",
			"--script", "/workspace/"+project+"/train.py",
			"--args", "--epochs", "1", "--output_dir", "/workspace/results")

		cmd.Dir = ".." // Run from project root
		output, err := cmd.CombinedOutput()

		if err != nil {
			t.Fatalf("Failed to execute example in container: %v\nOutput: %s", err, string(output))
		}

		// Check results
		resultsFile := filepath.Join(resultsDir, "results.json")
		if _, err := os.Stat(resultsFile); os.IsNotExist(err) {
			t.Errorf("Expected results.json not found in output")
		}

		t.Logf("Container execution successful")
	})
}

// TestPodmanExamplesSync tests the sync functionality using temp directories
func TestPodmanExamplesSync(t *testing.T) {
	// Use temporary directory to avoid modifying actual workspace
	tempDir := t.TempDir()
	tempWorkspace := filepath.Join(tempDir, "workspace")

	// Use fixtures for examples directory operations
	examplesDir := tests.NewExamplesDir(filepath.Join("..", "fixtures", "examples"))

	// Create temporary workspace
	if err := os.MkdirAll(tempWorkspace, 0755); err != nil {
		t.Fatalf("Failed to create temp workspace: %v", err)
	}

	// Get all example projects using fixtures
	projects, err := examplesDir.ListProjects()
	if err != nil {
		t.Fatalf("Failed to read examples directory: %v", err)
	}

	for _, projectName := range projects {
		dstDir := filepath.Join(tempWorkspace, projectName)

		t.Run("Sync_"+projectName, func(t *testing.T) {
			// Remove existing destination
			os.RemoveAll(dstDir)

			// Copy project using fixtures
			if err := examplesDir.CopyProject(projectName, dstDir); err != nil {
				t.Fatalf("Failed to copy %s to test workspace: %v", projectName, err)
			}

			// Verify copy
			requiredFiles := []string{"train.py", "requirements.txt", "README.md"}
			for _, file := range requiredFiles {
				dstFile := filepath.Join(dstDir, file)
				if _, err := os.Stat(dstFile); os.IsNotExist(err) {
					t.Errorf("Missing file %s in copied project %s", file, projectName)
				}
			}

			t.Logf("Successfully synced %s to temp workspace", projectName)
		})
	}
}