package storage

import (
	"os"
	"path/filepath"
	"testing"
)

func setupTestStorage(t *testing.T) *Storage {
	tempDir := t.TempDir()
	return NewStorage(tempDir)
}

func TestListFiles(t *testing.T) {
	storage := setupTestStorage(t)
	
	// Create test files
	content := "Test content"
	testFiles := []string{"test1.md", "test2.md", "notes.md"}
	
	for _, filename := range testFiles {
		path := filepath.Join(storage.dataDir, filename)
		if err := os.WriteFile(path, []byte(content), 0644); err != nil {
			t.Fatalf("Failed to create test file: %v", err)
		}
	}
	
	files, err := storage.ListFiles()
	if err != nil {
		t.Fatalf("Failed to list files: %v", err)
	}
	
	if len(files) != 3 {
		t.Errorf("Expected 3 files, got %d", len(files))
	}
	
	expected := map[string]bool{"test1.md": true, "test2.md": true, "notes.md": true}
	for _, file := range files {
		if !expected[file] {
			t.Errorf("Unexpected file: %s", file)
		}
	}
}

func TestGetFile(t *testing.T) {
	storage := setupTestStorage(t)
	
	filename := "testfile.md"
	content := "# Test Heading\n\nTest content."
	path := filepath.Join(storage.dataDir, filename)
	os.WriteFile(path, []byte(content), 0644)
	
	fileContent, err := storage.GetFile(filename)
	if err != nil {
		t.Fatalf("Failed to get file: %v", err)
	}
	
	if fileContent != content {
		t.Errorf("Expected content %q, got %q", content, fileContent)
	}
}

func TestGetFileNotFound(t *testing.T) {
	storage := setupTestStorage(t)
	
	_, err := storage.GetFile("nonexistent.md")
	if err == nil {
		t.Error("Expected error for non-existent file")
	}
}

func TestSaveFile(t *testing.T) {
	storage := setupTestStorage(t)
	
	filename := "newfile.md"
	content := "# New File\n\nContent here."
	
	err := storage.SaveFile(filename, content)
	if err != nil {
		t.Fatalf("Failed to save file: %v", err)
	}
	
	// Verify file was saved
	path := filepath.Join(storage.dataDir, filename)
	if _, err := os.Stat(path); os.IsNotExist(err) {
		t.Error("File was not saved")
	}
	
	// Verify content
	storedContent, err := os.ReadFile(path)
	if err != nil {
		t.Fatalf("Failed to read file: %v", err)
	}
	if string(storedContent) != content {
		t.Error("File content does not match")
	}
}

func TestDeleteFile(t *testing.T) {
	storage := setupTestStorage(t)
	
	filename := "todelete.md"
	content := "To be deleted."
	path := filepath.Join(storage.dataDir, filename)
	os.WriteFile(path, []byte(content), 0644)
	
	err := storage.DeleteFile(filename)
	if err != nil {
		t.Fatalf("Failed to delete file: %v", err)
	}
	
	// Verify file was deleted
	if _, err := os.Stat(path); !os.IsNotExist(err) {
		t.Error("File was not deleted")
	}
}

func TestDeleteFileNotFound(t *testing.T) {
	storage := setupTestStorage(t)
	
	err := storage.DeleteFile("nonexistent.md")
	if err == nil {
		t.Error("Expected error for non-existent file")
	}
}

func TestExists(t *testing.T) {
	storage := setupTestStorage(t)
	
	filename := "exists.md"
	path := filepath.Join(storage.dataDir, filename)
	os.WriteFile(path, []byte("content"), 0644)
	
	if !storage.Exists(filename) {
		t.Error("File should exist")
	}
	
	if storage.Exists("nonexistent.md") {
		t.Error("Non-existent file should not exist")
	}
}