package hws_test

import (
	"bytes"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"git.haelnorr.com/h/golib/hws"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func Test_SafeFileServer(t *testing.T) {
	t.Run("Nil filesystem returns error", func(t *testing.T) {
		handler, err := hws.SafeFileServer(nil)
		assert.Error(t, err)
		assert.Nil(t, handler)
		assert.Contains(t, err.Error(), "No file system provided")
	})

	t.Run("Valid filesystem returns handler", func(t *testing.T) {
		fs := http.Dir(".")
		httpFS := http.FileSystem(fs)
		handler, err := hws.SafeFileServer(&httpFS)
		assert.NoError(t, err)
		assert.NotNil(t, handler)
	})

	t.Run("Directory listing is blocked", func(t *testing.T) {
		// Create a temporary directory
		tmpDir := t.TempDir()
		
		// Create some test files
		testFile := filepath.Join(tmpDir, "test.txt")
		err := os.WriteFile(testFile, []byte("test content"), 0644)
		require.NoError(t, err)

		fs := http.Dir(tmpDir)
		httpFS := http.FileSystem(fs)
		handler, err := hws.SafeFileServer(&httpFS)
		require.NoError(t, err)

		// Try to access the directory
		req := httptest.NewRequest("GET", "/", nil)
		rr := httptest.NewRecorder()
		handler.ServeHTTP(rr, req)

		// Should return 404 for directory listing
		assert.Equal(t, http.StatusNotFound, rr.Code)
	})

	t.Run("Individual files are accessible", func(t *testing.T) {
		// Create a temporary directory
		tmpDir := t.TempDir()
		
		// Create a test file
		testFile := filepath.Join(tmpDir, "test.txt")
		testContent := []byte("test content")
		err := os.WriteFile(testFile, testContent, 0644)
		require.NoError(t, err)

		fs := http.Dir(tmpDir)
		httpFS := http.FileSystem(fs)
		handler, err := hws.SafeFileServer(&httpFS)
		require.NoError(t, err)

		// Try to access the file
		req := httptest.NewRequest("GET", "/test.txt", nil)
		rr := httptest.NewRecorder()
		handler.ServeHTTP(rr, req)

		// Should return 200 for file access
		assert.Equal(t, http.StatusOK, rr.Code)
		assert.Equal(t, string(testContent), rr.Body.String())
	})

	t.Run("Non-existent file returns 404", func(t *testing.T) {
		tmpDir := t.TempDir()
		
		fs := http.Dir(tmpDir)
		httpFS := http.FileSystem(fs)
		handler, err := hws.SafeFileServer(&httpFS)
		require.NoError(t, err)

		req := httptest.NewRequest("GET", "/nonexistent.txt", nil)
		rr := httptest.NewRecorder()
		handler.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusNotFound, rr.Code)
	})

	t.Run("Subdirectory listing is blocked", func(t *testing.T) {
		tmpDir := t.TempDir()
		
		// Create a subdirectory
		subDir := filepath.Join(tmpDir, "subdir")
		err := os.Mkdir(subDir, 0755)
		require.NoError(t, err)
		
		// Create a file in the subdirectory
		testFile := filepath.Join(subDir, "test.txt")
		err = os.WriteFile(testFile, []byte("content"), 0644)
		require.NoError(t, err)

		fs := http.Dir(tmpDir)
		httpFS := http.FileSystem(fs)
		handler, err := hws.SafeFileServer(&httpFS)
		require.NoError(t, err)

		// Try to list the subdirectory
		req := httptest.NewRequest("GET", "/subdir/", nil)
		rr := httptest.NewRecorder()
		handler.ServeHTTP(rr, req)

		// Should return 404 for subdirectory listing
		assert.Equal(t, http.StatusNotFound, rr.Code)
	})

	t.Run("Files in subdirectories are accessible", func(t *testing.T) {
		tmpDir := t.TempDir()
		
		// Create a subdirectory
		subDir := filepath.Join(tmpDir, "subdir")
		err := os.Mkdir(subDir, 0755)
		require.NoError(t, err)
		
		// Create a file in the subdirectory
		testFile := filepath.Join(subDir, "test.txt")
		testContent := []byte("subdirectory content")
		err = os.WriteFile(testFile, testContent, 0644)
		require.NoError(t, err)

		fs := http.Dir(tmpDir)
		httpFS := http.FileSystem(fs)
		handler, err := hws.SafeFileServer(&httpFS)
		require.NoError(t, err)

		// Try to access the file in the subdirectory
		req := httptest.NewRequest("GET", "/subdir/test.txt", nil)
		rr := httptest.NewRecorder()
		handler.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusOK, rr.Code)
		assert.Equal(t, string(testContent), rr.Body.String())
	})

	t.Run("Hidden files are accessible", func(t *testing.T) {
		tmpDir := t.TempDir()
		
		// Create a hidden file (starting with .)
		testFile := filepath.Join(tmpDir, ".hidden")
		testContent := []byte("hidden content")
		err := os.WriteFile(testFile, testContent, 0644)
		require.NoError(t, err)

		fs := http.Dir(tmpDir)
		httpFS := http.FileSystem(fs)
		handler, err := hws.SafeFileServer(&httpFS)
		require.NoError(t, err)

		req := httptest.NewRequest("GET", "/.hidden", nil)
		rr := httptest.NewRecorder()
		handler.ServeHTTP(rr, req)

		// Hidden files should still be accessible
		assert.Equal(t, http.StatusOK, rr.Code)
		assert.Equal(t, string(testContent), rr.Body.String())
	})
}

func Test_SafeFileServer_Integration(t *testing.T) {
	var buf bytes.Buffer
	
	tmpDir := t.TempDir()
	
	// Create test files
	indexFile := filepath.Join(tmpDir, "index.html")
	err := os.WriteFile(indexFile, []byte("<html>Test</html>"), 0644)
	require.NoError(t, err)
	
	cssFile := filepath.Join(tmpDir, "style.css")
	err = os.WriteFile(cssFile, []byte("body { color: red; }"), 0644)
	require.NoError(t, err)

	// Create server with SafeFileServer
	server := createTestServer(t, &buf)
	
	fs := http.Dir(tmpDir)
	httpFS := http.FileSystem(fs)
	handler, err := hws.SafeFileServer(&httpFS)
	require.NoError(t, err)

	err = server.AddRoutes(hws.Route{
		Path:    "/static/",
		Method:  hws.MethodGET,
		Handler: http.StripPrefix("/static", handler),
	})
	require.NoError(t, err)

	err = server.Start(t.Context())
	require.NoError(t, err)
	defer server.Shutdown(t.Context())

	<-server.Ready()

	t.Run("Can serve static files through server", func(t *testing.T) {
		// This would need actual HTTP requests to the running server
		// Simplified for now
	})
}