# =================== AIPass ====================
# Name: google_drive_sync.py
# Description: Google Drive Integration for AIPass Backup System
# Version: 2.6.0
# Created: 2025-10-30
# Modified: 2026-03-09
# =============================================

"""
Google Drive Sync Module - Orchestrates Drive backup operations.

Routes drive-sync commands, displays CLI output, delegates to
drive_sync_client handler for API operations.
"""

# =============================================
# IMPORTS
# =============================================

import sys
from pathlib import Path
from rich.progress import Progress, BarColumn, TextColumn, TimeElapsedColumn, TimeRemainingColumn
from aipass.cli.apps.modules import console
from aipass.cli.apps.modules.display import error, warning
from aipass.prax import logger
from aipass.backup.apps.handlers.json import json_handler

_BACKUP_ROOT = Path(__file__).resolve().parents[2]  # src/aipass/backup/

# =============================================
# CONSTANTS & CONFIG
# =============================================

# OAuth scopes for Drive access
SCOPES = ['https://www.googleapis.com/auth/drive.file']

# Module configuration
MODULE_NAME = "google_drive_sync"
JSON_DIR = _BACKUP_ROOT / "backup_json"
CONFIG_FILE = JSON_DIR / f"{MODULE_NAME}_config.json"
DATA_FILE = JSON_DIR / f"{MODULE_NAME}_data.json"
LOG_FILE = JSON_DIR / f"{MODULE_NAME}_log.json"

# =============================================
# CLIENT CLASS (delegated to handler)
# =============================================

try:
    from aipass.backup.apps.handlers.operations.drive_sync_client import (
        GoogleDriveSync,
    )
    from aipass.backup.apps.handlers.json.drive_sync_json import (
        load_config as _load_config_fn,
        load_data as _load_data_fn,
    )
    DRIVE_AVAILABLE = True
except ImportError:
    GoogleDriveSync = None  # type: ignore
    _load_config_fn = None  # type: ignore
    _load_data_fn = None  # type: ignore
    DRIVE_AVAILABLE = False
    logger.info("[google_drive_sync] Google Drive dependencies not available")

def _load_config():
    """Load config using module JSON paths."""
    if _load_config_fn is None:
        return {}
    return _load_config_fn(CONFIG_FILE)

def _load_data():
    """Load data using module JSON paths."""
    if _load_data_fn is None:
        return {}
    return _load_data_fn(DATA_FILE)


# =============================================
# BUSINESS OPERATIONS (delegated to handlers)
# =============================================

try:
    from aipass.backup.apps.handlers.operations.drive_sync_ops import (
        clear_file_tracker as _clear_file_tracker_handler,
        get_file_tracker_stats,
        test_drive_connection as _test_drive_connection,
    )
except ImportError:
    _clear_file_tracker_handler = None  # type: ignore
    get_file_tracker_stats = None  # type: ignore
    _test_drive_connection = None  # type: ignore

from aipass.backup.apps.handlers.operations.sync_test_ops import (
    create_sync_test_files,
    cleanup_sync_test_dir,
)


def _show_file_tracker_stats() -> bool:
    """Display file tracker statistics."""
    try:
        if get_file_tracker_stats is None:
            error("Drive sync dependencies not available")
            return False
        stats = get_file_tracker_stats()
        console.print(f"File Tracker Statistics:")
        console.print(f"  - Total tracked files: {stats['total']}")
        if stats['sample']:
            console.print(f"  - Sample entries:")
            for i, entry in enumerate(stats['sample']):
                console.print(f"    {i+1}. {entry['file']} (last sync: {entry['last_sync']})")
            if stats['truncated']:
                remaining = stats['total'] - len(stats['sample'])
                console.print(f"    ... and {remaining} more files")
        return True
    except Exception as e:
        error(f"Error showing tracker stats: {e}")
        logger.error(f"Error showing tracker stats: {e}")
        return False


def _clear_file_tracker() -> bool:
    """Clear the file tracker cache for fresh sync."""
    try:
        data = _load_data()
        tracker_count = len(data.get("runtime_state", {}).get("file_tracker", {}))
        if _clear_file_tracker_handler is None:
            error("Drive sync dependencies not available")
            return False
        success = _clear_file_tracker_handler()
        if success:
            console.print(f"Cleared {tracker_count} entries from file tracker")
            logger.info(f"Cleared {tracker_count} entries from file tracker")
        else:
            console.print("File tracker already empty or clear failed")
        return success
    except Exception as e:
        error(f"Error clearing file tracker: {e}")
        logger.error(f"Error clearing file tracker: {e}")
        return False


def _test_drive_sync() -> bool:
    """Test Drive integration."""
    try:
        if GoogleDriveSync is None:
            error("Drive sync dependencies not available")
            return False
        sync = GoogleDriveSync()
        if not sync.authenticate():
            return False
        console.print("Testing folder creation...")
        if _test_drive_connection is None:
            error("Drive sync dependencies not available")
            return False
        result = _test_drive_connection(sync)
        if result:
            folder_id = sync.get_or_create_backup_folder()
            console.print(f"Backup folder ready: {folder_id}")
        else:
            error("Failed to create backup folder")
        return result
    except Exception as e:
        error(f"Test failed: {e}")
        logger.error(f"Test failed: {e}")
        return False

def _run_sync_test() -> bool:
    """Run a small test sync to verify Drive integration."""
    console.print("[bold cyan]Drive Sync Test[/bold cyan]")
    console.print()

    # Create test files via handler
    setup = create_sync_test_files(_BACKUP_ROOT)
    if not setup["success"]:
        error(f"Failed to create test files: {setup['error']}")
        return False

    test_dir = setup["test_dir"]
    console.print(f"  Created {setup['file_count']} test files in {test_dir}")

    # Run sync
    if GoogleDriveSync is None:
        error("Drive sync dependencies not available")
        cleanup_sync_test_dir(test_dir)
        return False
    sync = GoogleDriveSync()
    if not sync.authenticate():
        error("Auth failed")
        cleanup_sync_test_dir(test_dir)
        return False

    console.print(f"\nScanning...")
    files_to_upload, skipped, total = sync.prepare_sync(test_dir, force_sync=True)
    upload_count = len(files_to_upload)

    console.print(f"  Files: {total} total, {upload_count} to upload")

    # Verify Drive folder before uploading
    console.print(f"\nVerifying Drive folder: AIPass_Test...")
    folder_id = sync.get_or_create_project_folder("AIPass_Test")
    if not folder_id:
        error_msg = sync.last_error or "Unknown error"
        error(f"FAILED: {error_msg}")
        cleanup_sync_test_dir(test_dir)
        return False
    console.print(f"  Drive folder ready: AIPass_Test")

    console.print(f"Uploading...")

    def show_test_progress(completed, total_upload, _successes):
        """Display test upload progress to console."""
        console.print(f"  {completed}/{total_upload}")

    result = sync.sync_backup_files(
        test_dir, "AIPass_Test", "sync test", True,
        prepared_files=files_to_upload,
        skipped_count=skipped,
        total_count=total,
        progress_fn=show_test_progress
    )

    if result.get("error"):
        error(f"FAILED: {result['error']}")
        cleanup_sync_test_dir(test_dir)
        return False

    console.print()
    if result["success"]:
        console.print(f"[green]Test passed: {result['uploaded']}/{result['total']} files synced[/green]")
    else:
        error(f"Test failed: {result['uploaded']} OK, {result['failed']} failed")

    # Run it again to verify no duplicates
    console.print(f"\nRe-running sync (should show 0 to upload)...")
    files_to_upload2, _, _ = sync.prepare_sync(test_dir, force_sync=False)

    if len(files_to_upload2) == 0:
        console.print(f"[green]Dedup check passed: 0 files need re-upload[/green]")
    else:
        error(f"Dedup check failed: {len(files_to_upload2)} files flagged for re-upload")

    # Cleanup local test dir via handler
    cleanup_sync_test_dir(test_dir)
    console.print(f"\nCleaned up local test files")
    console.print(f"[dim]Test Drive folder 'AIPass_Test' left on Drive for inspection[/dim]")

    return result["success"]


# =============================================
# HANDLE_COMMAND (Drone Integration)
# =============================================

def handle_command(args) -> bool:
    """Route Google Drive sync commands from backup_system orchestrator.

    Args:
        args: Command-line arguments from CLI parser

    Returns:
        bool: True if command was handled, False if not a drive sync command
    """
    if not args:
        print_introspection()
        return True

    if not hasattr(args, 'command'):
        return False

    command = args.command

    if command in ['--help', '-h', 'help']:
        console.print()
        console.print("[bold cyan]google_drive_sync - Google Drive Integration[/bold cyan]")
        console.print()
        console.print("Syncs AIPass backups to Google Drive using OAuth2.")
        console.print()
        console.print("[yellow]Commands:[/yellow]")
        console.print("  drive-test          - Test Google Drive connectivity")
        console.print("  drive-sync          - Sync backup directory to Google Drive")
        console.print("  drive-sync --test   - Run a small test sync to verify integration")
        console.print("  drive-clear-tracker - Clear file tracker cache")
        console.print("  drive-stats         - Show file tracker statistics")
        console.print()
        console.print("[yellow]Options:[/yellow]")
        console.print("  --project  Project name (default: AIPass)")
        console.print("  --note     Sync note (default: Manual sync)")
        console.print("  --force    Force upload all files")
        console.print()
        return True

    if command == 'drive-test':
        return _test_drive_sync()

    elif command == 'drive-sync':
        # --test flag routes to test mode
        if getattr(args, 'test', False):
            return _run_sync_test()

        raw_path = getattr(args, 'path', None)
        if raw_path:
            backup_path = Path(raw_path)
        else:
            # Default to snapshot backup directory
            backup_path = _BACKUP_ROOT / "backups" / "system_snapshot"
        if not backup_path.exists():
            error(f"Backup directory not found: {backup_path}")
            return False

        project = getattr(args, 'project', 'AIPass') or 'AIPass'
        note = getattr(args, 'note', 'Manual sync') or 'Manual sync'
        force = getattr(args, 'force', False)

        if GoogleDriveSync is None:
            error("Drive sync dependencies not available")
            return False
        sync = GoogleDriveSync()
        if not sync.authenticate():
            error("FAILED: Could not authenticate with Google Drive")
            return False

        limit = getattr(args, 'limit', 0) or 0

        # Show last backup timestamps for all modes
        from aipass.backup.apps.handlers.utils.backup_timestamps import get_timestamps, format_age
        ts = get_timestamps()
        console.print()
        console.print("[dim]Last backups:[/dim]")
        console.print(f"  [dim]Snapshot:   {format_age(ts.get('snapshot'))}[/dim]")
        console.print(f"  [dim]Versioned:  {format_age(ts.get('versioned'))}[/dim]")
        console.print(f"  [dim]Drive sync: {format_age(ts.get('drive_sync'))}[/dim]")
        console.print()

        # Pre-flight: verify Drive folder FIRST (may reset tracker)
        console.print(f"Verifying Drive folder (project: {project})...")
        folder_id = sync.get_or_create_project_folder(project)
        if not folder_id:
            error_msg = sync.last_error or "Unknown error"
            error(f"FAILED: {error_msg}")
            error("Sync aborted - no files uploaded")
            return False
        console.print(f"  Drive folder ready: {project}")

        if sync.tracker_was_reset:
            warning("Drive folder is new - tracker reset, full re-sync needed")

        # Phase 1: Scan (local only, fast) - runs AFTER folder check so tracker is accurate
        console.print(f"\nScanning {backup_path}...")
        files_to_upload, skipped, total = sync.prepare_sync(backup_path, force, limit)
        upload_count = len(files_to_upload)

        # Display plan
        console.print(f"  Files considered: {total}{f' (limited to {limit})' if limit > 0 else ''}")
        console.print(f"  To upload:       {upload_count} ({'forced' if force else 'changed/new'})")
        console.print(f"  Unchanged:       {skipped}")

        if upload_count == 0:
            console.print("[green]All files up to date - nothing to sync[/green]")
            return True

        console.print()

        # Phase 2: Upload with progress bar
        with Progress(
            TextColumn("{task.description}"),
            BarColumn(bar_width=40),
            TextColumn("[progress.percentage]{task.percentage:>3.0f}%"),
            TextColumn("{task.completed}/{task.total}"),
            TextColumn("[green]{task.fields[ok]} OK[/green]"),
            TimeElapsedColumn(),
            TimeRemainingColumn(),
            console=console,
        ) as progress:
            task_id = progress.add_task("Uploading...", total=upload_count, ok=0)

            def show_progress(completed, total_upload, successes):
                """Update progress bar."""
                progress.update(task_id, completed=completed, ok=successes)

            result = sync.sync_backup_files(
                backup_path, project, note, force,
                prepared_files=files_to_upload,
                skipped_count=skipped,
                total_count=total,
                progress_fn=show_progress
            )

            # Update label when complete
            progress.update(task_id, description="Uploaded  ")

        # Check for errors
        if result.get("error"):
            error(f"FAILED: {result['error']}")
            error("Sync aborted - no files uploaded")
            return False

        # Summary
        console.print()
        if result["success"]:
            from aipass.backup.apps.handlers.utils.backup_timestamps import update_timestamp, get_timestamps, format_age
            update_timestamp("drive_sync")
            ts = get_timestamps()
            console.print(f"[green]Sync complete: {result['uploaded']} uploaded, {result['skipped']} unchanged[/green]")
            console.print()
            console.print(f"[dim]Backups now:[/dim]")
            console.print(f"  [dim]Snapshot:   {format_age(ts.get('snapshot'))}[/dim]")
            console.print(f"  [dim]Versioned:  {format_age(ts.get('versioned'))}[/dim]")
            console.print(f"  [dim]Drive sync: {format_age(ts.get('drive_sync'))}[/dim]")
        else:
            error(f"Sync failed: {result['uploaded']} uploaded, {result['failed']} failed, {result['skipped']} unchanged")

        return result["success"]

    elif command == 'drive-sync-test':
        return _run_sync_test()

    elif command == 'drive-clear-tracker':
        return _clear_file_tracker()

    elif command == 'drive-stats':
        return _show_file_tracker_stats()

    json_handler.log_operation("drive_command", {"command": command})
    return False

# =============================================
# CLI/EXECUTION
# =============================================

def print_introspection():
    """Display module introspection info."""
    console.print()
    console.print("google_drive_sync Module")
    console.print("Orchestrates Google Drive backup sync with two-phase upload pipeline")
    console.print()
    console.print("Connected Handlers:")
    console.print("  handlers/operations/")
    console.print("    - drive_sync_client.py (GoogleDriveSync — Drive API client and upload engine)")
    console.print("    - drive_sync_ops.py (clear_file_tracker — reset sync tracker cache)")
    console.print("    - drive_sync_ops.py (get_file_tracker_stats — tracker statistics)")
    console.print("    - drive_sync_ops.py (test_drive_connection — connectivity verification)")
    console.print("    - sync_test_ops.py (create_sync_test_files — generate test fixtures)")
    console.print("    - sync_test_ops.py (cleanup_sync_test_dir — remove test fixtures)")
    console.print("  handlers/json/")
    console.print("    - drive_sync_json.py (load_config — read module config JSON)")
    console.print("    - drive_sync_json.py (load_data — read module data JSON)")
    console.print("  handlers/utils/")
    console.print("    - backup_timestamps.py (get_timestamps, update_timestamp, format_age — backup timing)")
    console.print()


if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(
        description="Google Drive Sync for AIPass Backup System",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
COMMANDS:
  Commands: test, sync, sync-test, clear-tracker, show-stats

  test          - Test Google Drive connectivity
  sync          - Sync backup directory to Google Drive
  sync-test     - Run a small test sync to verify integration
  clear-tracker - Clear file tracker cache
  show-stats    - Show file tracker statistics

OPTIONS:
  --project     - Project name for sync (default: AIPass)
  --note        - Note for sync operation (default: Manual sync)
  --force       - Force sync all files (ignore tracker)

EXAMPLES:
  python3 google_drive_sync.py test
  python3 google_drive_sync.py sync /path/to/backups
  python3 google_drive_sync.py sync /path/to/backups --project "MyProject" --note "Daily backup"
  python3 google_drive_sync.py sync /path/to/backups --force
  python3 google_drive_sync.py clear-tracker
  python3 google_drive_sync.py show-stats
        """
    )

    parser.add_argument("command",
                       choices=['test', 'sync', 'sync-test', 'clear-tracker', 'show-stats'],
                       help="Command to execute")
    parser.add_argument("path", nargs='?', help="Backup directory path (required for sync command)")
    parser.add_argument("--project", type=str, default="AIPass", help="Project name for sync")
    parser.add_argument("--note", type=str, default="Manual sync", help="Note for sync operation")
    parser.add_argument("--force", action="store_true", help="Force sync all files (ignore tracker)")

    args = parser.parse_args()

    # Check if module is enabled
    config = _load_config()
    if not config.get("config", {}).get("enabled", True):
        warning("Google Drive sync is disabled")
        sys.exit(0)

    if args.command == 'clear-tracker':
        if _clear_file_tracker():
            console.print("File tracker cleared successfully")
            sys.exit(0)
        else:
            error("Failed to clear file tracker")
            sys.exit(1)

    elif args.command == 'show-stats':
        if _show_file_tracker_stats():
            sys.exit(0)
        else:
            sys.exit(1)

    elif args.command == 'sync':
        if not args.path:
            error("sync command requires a path argument")
            console.print("Usage: python3 google_drive_sync.py sync /path/to/backups")
            sys.exit(1)

        backup_path = Path(args.path)

        if not backup_path.exists():
            error(f"Backup directory not found: {backup_path}")
            sys.exit(1)

        if GoogleDriveSync is None:
            error("Drive sync dependencies not available")
            sys.exit(1)
        sync = GoogleDriveSync()
        if not sync.authenticate():
            error("Failed to authenticate with Google Drive")
            sys.exit(1)

        # Phase 1: Scan
        console.print(f"Scanning {backup_path}...")
        files_to_upload, skipped, total = sync.prepare_sync(backup_path, args.force)
        upload_count = len(files_to_upload)

        console.print(f"  Files scanned: {total}")
        console.print(f"  To upload:     {upload_count} ({'forced' if args.force else 'changed/new'})")
        console.print(f"  Unchanged:     {skipped}")

        if upload_count == 0:
            console.print("[green]All files up to date - nothing to sync[/green]")
            sys.exit(0)

        console.print(f"\nSyncing to Google Drive (project: {args.project})...")

        def cli_progress(completed, total_upload, successes):
            """Display CLI upload progress."""
            console.print(f"  Progress: {completed}/{total_upload} ({successes} OK)")

        # Phase 2: Upload
        result = sync.sync_backup_files(
            backup_path, args.project, args.note, args.force,
            prepared_files=files_to_upload,
            skipped_count=skipped,
            total_count=total,
            progress_fn=cli_progress
        )

        console.print()
        if result["success"]:
            console.print(f"[green]Sync complete: {result['uploaded']} uploaded, {result['skipped']} unchanged[/green]")
            sys.exit(0)
        else:
            warning(f"Sync finished: {result['uploaded']} uploaded, {result['failed']} failed, {result['skipped']} unchanged")
            sys.exit(1)

    elif args.command == 'sync-test':
        # Create a minimal args namespace for the test function
        if _run_sync_test():
            sys.exit(0)
        else:
            sys.exit(1)

    elif args.command == 'test':
        if _test_drive_sync():
            console.print("Google Drive sync test successful")
            sys.exit(0)
        else:
            console.print("Google Drive sync test failed")
            sys.exit(1)