package storage

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

func TestLocalStorage_Upload(t *testing.T) {
	tmpDir := t.TempDir()
	t.Setenv("LOCAL_UPLOAD_DIR", tmpDir)
	os.Unsetenv("LOCAL_UPLOAD_BASE_URL")
	// No LOCAL_UPLOAD_BASE_URL set - should return relative path

	store := NewLocalStorageFromEnv()
	if store == nil {
		t.Fatal("NewLocalStorageFromEnv returned nil")
	}

	ctx := context.Background()
	data := []byte("hello world")
	contentType := "text/plain"
	filename := "test.txt"

	link, err := store.Upload(ctx, "test-key.txt", data, contentType, filename)
	if err != nil {
		t.Fatalf("Upload failed: %v", err)
	}

	expectedLink := "/uploads/test-key.txt"
	if link != expectedLink {
		t.Errorf("link = %q, want %q", link, expectedLink)
	}

	filePath := filepath.Join(tmpDir, "test-key.txt")
	stored, err := os.ReadFile(filePath)
	if err != nil {
		t.Fatalf("failed to read uploaded file: %v", err)
	}
	if string(stored) != string(data) {
		t.Errorf("stored data = %q, want %q", stored, data)
	}
}

func TestLocalStorage_Upload_WithBaseURL(t *testing.T) {
	tmpDir := t.TempDir()
	t.Setenv("LOCAL_UPLOAD_DIR", tmpDir)
	t.Setenv("LOCAL_UPLOAD_BASE_URL", "http://localhost:8080")

	store := NewLocalStorageFromEnv()
	if store == nil {
		t.Fatal("NewLocalStorageFromEnv returned nil")
	}

	ctx := context.Background()
	data := []byte("hello world")
	contentType := "text/plain"
	filename := "test.txt"

	link, err := store.Upload(ctx, "test-key.txt", data, contentType, filename)
	if err != nil {
		t.Fatalf("Upload failed: %v", err)
	}

	// When LOCAL_UPLOAD_BASE_URL is set, should return full URL
	expectedLink := "http://localhost:8080/uploads/test-key.txt"
	if link != expectedLink {
		t.Errorf("link = %q, want %q", link, expectedLink)
	}

	filePath := filepath.Join(tmpDir, "test-key.txt")
	stored, err := os.ReadFile(filePath)
	if err != nil {
		t.Fatalf("failed to read uploaded file: %v", err)
	}
	if string(stored) != string(data) {
		t.Errorf("stored data = %q, want %q", stored, data)
	}
}

func TestLocalStorage_Delete(t *testing.T) {
	tmpDir := t.TempDir()
	t.Setenv("LOCAL_UPLOAD_DIR", tmpDir)

	store := NewLocalStorageFromEnv()
	if store == nil {
		t.Fatal("NewLocalStorageFromEnv returned nil")
	}

	ctx := context.Background()
	data := []byte("hello world")

	_, err := store.Upload(ctx, "delete-me.txt", data, "text/plain", "delete-me.txt")
	if err != nil {
		t.Fatalf("Upload failed: %v", err)
	}

	filePath := filepath.Join(tmpDir, "delete-me.txt")
	if _, err := os.ReadFile(filePath); err != nil {
		t.Fatalf("file should exist: %v", err)
	}

	store.Delete(ctx, "delete-me.txt")

	if _, err := os.ReadFile(filePath); !os.IsNotExist(err) {
		t.Errorf("file should be deleted")
	}
}

func TestLocalStorage_KeyFromURL(t *testing.T) {
	tmpDir := t.TempDir()
	t.Setenv("LOCAL_UPLOAD_DIR", tmpDir)
	// No baseURL set

	store := NewLocalStorageFromEnv()
	if store == nil {
		t.Fatal("NewLocalStorageFromEnv returned nil")
	}

	tests := []struct {
		name     string
		rawURL   string
		expected string
	}{
		{"local URL format", "/uploads/abc123.png", "abc123.png"},
		{"local URL with subdir", "/uploads/2024/01/image.jpg", "2024/01/image.jpg"},
		{"local URL with workspace prefix", "/uploads/workspaces/ws-123/abc.png", "workspaces/ws-123/abc.png"},
		{"just filename", "abc123.png", "abc123.png"},
		{"full path", "/some/path/to/file.pdf", "file.pdf"},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			got := store.KeyFromURL(tc.rawURL)
			if got != tc.expected {
				t.Errorf("KeyFromURL(%q) = %q, want %q", tc.rawURL, got, tc.expected)
			}
		})
	}
}

func TestLocalStorage_KeyFromURL_WithBaseURL(t *testing.T) {
	tmpDir := t.TempDir()
	t.Setenv("LOCAL_UPLOAD_DIR", tmpDir)
	t.Setenv("LOCAL_UPLOAD_BASE_URL", "http://localhost:8080")

	store := NewLocalStorageFromEnv()
	if store == nil {
		t.Fatal("NewLocalStorageFromEnv returned nil")
	}

	tests := []struct {
		name     string
		rawURL   string
		expected string
	}{
		{"full URL format", "http://localhost:8080/uploads/abc123.png", "abc123.png"},
		{"full URL with subdir", "http://localhost:8080/uploads/2024/01/image.jpg", "2024/01/image.jpg"},
		{"local URL format still works", "/uploads/abc123.png", "abc123.png"},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			got := store.KeyFromURL(tc.rawURL)
			if got != tc.expected {
				t.Errorf("KeyFromURL(%q) = %q, want %q", tc.rawURL, got, tc.expected)
			}
		})
	}
}

func TestLocalStorage_DeleteKeys(t *testing.T) {
	tmpDir := t.TempDir()
	t.Setenv("LOCAL_UPLOAD_DIR", tmpDir)

	store := NewLocalStorageFromEnv()
	if store == nil {
		t.Fatal("NewLocalStorageFromEnv returned nil")
	}

	ctx := context.Background()
	data := []byte("hello world")

	keys := []string{"file1.txt", "file2.txt", "file3.txt"}
	for _, key := range keys {
		_, err := store.Upload(ctx, key, data, "text/plain", key)
		if err != nil {
			t.Fatalf("Upload %s failed: %v", key, err)
		}
	}

	store.DeleteKeys(ctx, keys)

	for _, key := range keys {
		filePath := filepath.Join(tmpDir, key)
		if _, err := os.ReadFile(filePath); !os.IsNotExist(err) {
			t.Errorf("file %s should be deleted", key)
		}
	}
}

func TestLocalStorage_KeyFromURL_Empty(t *testing.T) {
	tmpDir := t.TempDir()
	t.Setenv("LOCAL_UPLOAD_DIR", tmpDir)

	store := NewLocalStorageFromEnv()
	if store == nil {
		t.Fatal("NewLocalStorageFromEnv returned nil")
	}

	if got := store.KeyFromURL(""); got != "" {
		t.Errorf("KeyFromURL(\"\") = %q, want empty string", got)
	}
}