"""hermes claw — OpenClaw migration commands.

Usage:
    hermes claw migrate              # Interactive migration from ~/.openclaw
    hermes claw migrate --dry-run    # Preview what would be migrated
    hermes claw migrate --preset full --overwrite  # Full migration, overwrite conflicts
    hermes claw cleanup              # Archive leftover OpenClaw directories
    hermes claw cleanup --dry-run    # Preview what would be archived
"""

import importlib.util
import logging
import shutil
import sys
from datetime import datetime
from pathlib import Path

from hermes_cli.config import get_hermes_home, get_config_path, load_config, save_config
from hermes_constants import get_optional_skills_dir
from hermes_cli.setup import (
    Colors,
    color,
    print_header,
    print_info,
    print_success,
    print_error,
    print_warning,
    prompt_yes_no,
)

logger = logging.getLogger(__name__)

PROJECT_ROOT = Path(__file__).parent.parent.resolve()

_OPENCLAW_SCRIPT = (
    get_optional_skills_dir(PROJECT_ROOT / "optional-skills")
    / "migration"
    / "openclaw-migration"
    / "scripts"
    / "openclaw_to_hermes.py"
)

# Fallback: user may have installed the skill from the Hub
_OPENCLAW_SCRIPT_INSTALLED = (
    get_hermes_home()
    / "skills"
    / "migration"
    / "openclaw-migration"
    / "scripts"
    / "openclaw_to_hermes.py"
)

# Known OpenClaw directory names (current + legacy)
_OPENCLAW_DIR_NAMES = (".openclaw", ".clawdbot", ".moldbot")

# State files commonly found in OpenClaw workspace directories that cause
# confusion after migration (the agent discovers them and writes to them)
_WORKSPACE_STATE_GLOBS = (
    "*/todo.json",
    "*/sessions/*",
    "*/memory/*.json",
    "*/logs/*",
)


def _find_migration_script() -> Path | None:
    """Find the openclaw_to_hermes.py script in known locations."""
    for candidate in [_OPENCLAW_SCRIPT, _OPENCLAW_SCRIPT_INSTALLED]:
        if candidate.exists():
            return candidate
    return None


def _load_migration_module(script_path: Path):
    """Dynamically load the migration script as a module."""
    spec = importlib.util.spec_from_file_location("openclaw_to_hermes", script_path)
    if spec is None or spec.loader is None:
        return None
    mod = importlib.util.module_from_spec(spec)
    # Register in sys.modules so @dataclass can resolve the module
    # (Python 3.11+ requires this for dynamically loaded modules)
    sys.modules[spec.name] = mod
    try:
        spec.loader.exec_module(mod)
    except Exception:
        sys.modules.pop(spec.name, None)
        raise
    return mod


def _find_openclaw_dirs() -> list[Path]:
    """Find all OpenClaw directories on disk."""
    found = []
    for name in _OPENCLAW_DIR_NAMES:
        candidate = Path.home() / name
        if candidate.is_dir():
            found.append(candidate)
    return found


def _scan_workspace_state(source_dir: Path) -> list[tuple[Path, str]]:
    """Scan an OpenClaw directory for workspace state files that cause confusion.

    Returns a list of (path, description) tuples.
    """
    findings: list[tuple[Path, str]] = []

    # Direct state files in the root
    for name in ("todo.json", "sessions", "logs"):
        candidate = source_dir / name
        if candidate.exists():
            kind = "directory" if candidate.is_dir() else "file"
            findings.append((candidate, f"Root {kind}: {name}"))

    # State files inside workspace directories
    for child in sorted(source_dir.iterdir()):
        if not child.is_dir() or child.name.startswith("."):
            continue
        # Check for workspace-like subdirectories
        for state_name in ("todo.json", "sessions", "logs", "memory"):
            state_path = child / state_name
            if state_path.exists():
                kind = "directory" if state_path.is_dir() else "file"
                rel = state_path.relative_to(source_dir)
                findings.append((state_path, f"Workspace {kind}: {rel}"))

    return findings


def _archive_directory(source_dir: Path, dry_run: bool = False) -> Path:
    """Rename an OpenClaw directory to .pre-migration.

    Returns the archive path.
    """
    timestamp = datetime.now().strftime("%Y%m%d")
    archive_name = f"{source_dir.name}.pre-migration"
    archive_path = source_dir.parent / archive_name

    # If archive already exists, add timestamp
    if archive_path.exists():
        archive_name = f"{source_dir.name}.pre-migration-{timestamp}"
        archive_path = source_dir.parent / archive_name

    # If still exists (multiple runs same day), add counter
    counter = 2
    while archive_path.exists():
        archive_name = f"{source_dir.name}.pre-migration-{timestamp}-{counter}"
        archive_path = source_dir.parent / archive_name
        counter += 1

    if not dry_run:
        source_dir.rename(archive_path)

    return archive_path


def claw_command(args):
    """Route hermes claw subcommands."""
    action = getattr(args, "claw_action", None)

    if action == "migrate":
        _cmd_migrate(args)
    elif action in ("cleanup", "clean"):
        _cmd_cleanup(args)
    else:
        print("Usage: hermes claw <command> [options]")
        print()
        print("Commands:")
        print("  migrate          Migrate settings from OpenClaw to Hermes")
        print("  cleanup          Archive leftover OpenClaw directories after migration")
        print()
        print("Run 'hermes claw <command> --help' for options.")


def _cmd_migrate(args):
    """Run the OpenClaw → Hermes migration."""
    # Check current and legacy OpenClaw directories
    explicit_source = getattr(args, "source", None)
    if explicit_source:
        source_dir = Path(explicit_source)
    else:
        source_dir = Path.home() / ".openclaw"
        if not source_dir.is_dir():
            # Try legacy directory names
            for legacy in (".clawdbot", ".moldbot"):
                candidate = Path.home() / legacy
                if candidate.is_dir():
                    source_dir = candidate
                    break
    dry_run = getattr(args, "dry_run", False)
    preset = getattr(args, "preset", "full")
    overwrite = getattr(args, "overwrite", False)
    migrate_secrets = getattr(args, "migrate_secrets", False)
    workspace_target = getattr(args, "workspace_target", None)
    skill_conflict = getattr(args, "skill_conflict", "skip")

    # If using the "full" preset, secrets are included by default
    if preset == "full":
        migrate_secrets = True

    print()
    print(
        color(
            "┌─────────────────────────────────────────────────────────┐",
            Colors.MAGENTA,
        )
    )
    print(
        color(
            "│          ⚕ Hermes — OpenClaw Migration                 │",
            Colors.MAGENTA,
        )
    )
    print(
        color(
            "└─────────────────────────────────────────────────────────┘",
            Colors.MAGENTA,
        )
    )

    # Check source directory
    if not source_dir.is_dir():
        print()
        print_error(f"OpenClaw directory not found: {source_dir}")
        print_info("Make sure your OpenClaw installation is at the expected path.")
        print_info("You can specify a custom path: hermes claw migrate --source /path/to/.openclaw")
        return

    # Find the migration script
    script_path = _find_migration_script()
    if not script_path:
        print()
        print_error("Migration script not found.")
        print_info("Expected at one of:")
        print_info(f"  {_OPENCLAW_SCRIPT}")
        print_info(f"  {_OPENCLAW_SCRIPT_INSTALLED}")
        print_info("Make sure the openclaw-migration skill is installed.")
        return

    # Show what we're doing
    hermes_home = get_hermes_home()
    print()
    print_header("Migration Settings")
    print_info(f"Source:      {source_dir}")
    print_info(f"Target:      {hermes_home}")
    print_info(f"Preset:      {preset}")
    print_info(f"Mode:        {'dry run (preview only)' if dry_run else 'execute'}")
    print_info(f"Overwrite:   {'yes' if overwrite else 'no (skip conflicts)'}")
    print_info(f"Secrets:     {'yes (allowlisted only)' if migrate_secrets else 'no'}")
    if skill_conflict != "skip":
        print_info(f"Skill conflicts: {skill_conflict}")
    if workspace_target:
        print_info(f"Workspace:   {workspace_target}")
    print()

    # For execute mode (non-dry-run), confirm unless --yes was passed
    if not dry_run and not getattr(args, "yes", False):
        if not prompt_yes_no("Proceed with migration?", default=True):
            print_info("Migration cancelled.")
            return

    # Ensure config.yaml exists before migration tries to read it
    config_path = get_config_path()
    if not config_path.exists():
        save_config(load_config())

    # Load and run the migration
    try:
        mod = _load_migration_module(script_path)
        if mod is None:
            print_error("Could not load migration script.")
            return

        selected = mod.resolve_selected_options(None, None, preset=preset)
        ws_target = Path(workspace_target).resolve() if workspace_target else None

        migrator = mod.Migrator(
            source_root=source_dir.resolve(),
            target_root=hermes_home.resolve(),
            execute=not dry_run,
            workspace_target=ws_target,
            overwrite=overwrite,
            migrate_secrets=migrate_secrets,
            output_dir=None,
            selected_options=selected,
            preset_name=preset,
            skill_conflict_mode=skill_conflict,
        )
        report = migrator.migrate()
    except Exception as e:
        print()
        print_error(f"Migration failed: {e}")
        logger.debug("OpenClaw migration error", exc_info=True)
        return

    # Print results
    _print_migration_report(report, dry_run)

    # After successful non-dry-run migration, offer to archive the source directory
    if not dry_run and report.get("summary", {}).get("migrated", 0) > 0:
        _offer_source_archival(source_dir, getattr(args, "yes", False))


def _offer_source_archival(source_dir: Path, auto_yes: bool = False):
    """After migration, offer to rename the source directory to prevent state fragmentation.

    OpenClaw workspace directories contain state files (todo.json, sessions, etc.)
    that the agent may discover and write to, causing confusion. Renaming the
    directory prevents this.
    """
    if not source_dir.is_dir():
        return

    # Scan for state files that could cause problems
    state_files = _scan_workspace_state(source_dir)

    print()
    print_header("Post-Migration Cleanup")
    print_info("The OpenClaw directory still exists and contains workspace state files")
    print_info("that can confuse the agent (todo lists, sessions, logs).")
    if state_files:
        print()
        print(color("  Found state files:", Colors.YELLOW))
        # Show up to 10 most relevant findings
        for path, desc in state_files[:10]:
            print(f"      {desc}")
        if len(state_files) > 10:
            print(f"      ... and {len(state_files) - 10} more")
    print()
    print_info(f"Recommend: rename {source_dir.name}/ to {source_dir.name}.pre-migration/")
    print_info("This prevents the agent from discovering old workspace directories.")
    print_info("You can always rename it back if needed.")
    print()

    if auto_yes or prompt_yes_no(f"Archive {source_dir} now?", default=True):
        try:
            archive_path = _archive_directory(source_dir)
            print_success(f"Archived: {source_dir} → {archive_path}")
            print_info("The original directory has been renamed, not deleted.")
            print_info(f"To undo: mv {archive_path} {source_dir}")
        except OSError as e:
            print_error(f"Could not archive: {e}")
            print_info(f"You can do it manually: mv {source_dir} {source_dir}.pre-migration")
    else:
        print_info("Skipped. You can archive later with: hermes claw cleanup")


def _cmd_cleanup(args):
    """Archive leftover OpenClaw directories after migration.

    Scans for OpenClaw directories that still exist after migration and offers
    to rename them to .pre-migration to prevent state fragmentation.
    """
    dry_run = getattr(args, "dry_run", False)
    auto_yes = getattr(args, "yes", False)
    explicit_source = getattr(args, "source", None)

    print()
    print(
        color(
            "┌─────────────────────────────────────────────────────────┐",
            Colors.MAGENTA,
        )
    )
    print(
        color(
            "│          ⚕ Hermes — OpenClaw Cleanup                   │",
            Colors.MAGENTA,
        )
    )
    print(
        color(
            "└─────────────────────────────────────────────────────────┘",
            Colors.MAGENTA,
        )
    )

    # Find OpenClaw directories
    if explicit_source:
        dirs_to_check = [Path(explicit_source)]
    else:
        dirs_to_check = _find_openclaw_dirs()

    if not dirs_to_check:
        print()
        print_success("No OpenClaw directories found. Nothing to clean up.")
        return

    total_archived = 0

    for source_dir in dirs_to_check:
        print()
        print_header(f"Found: {source_dir}")

        # Scan for state files
        state_files = _scan_workspace_state(source_dir)

        # Show directory stats
        try:
            workspace_dirs = [
                d for d in source_dir.iterdir()
                if d.is_dir() and not d.name.startswith(".")
                and any((d / name).exists() for name in ("todo.json", "SOUL.md", "MEMORY.md", "USER.md"))
            ]
        except OSError:
            workspace_dirs = []

        if workspace_dirs:
            print_info(f"Workspace directories: {len(workspace_dirs)}")
            for ws in workspace_dirs[:5]:
                items = []
                if (ws / "todo.json").exists():
                    items.append("todo.json")
                if (ws / "sessions").is_dir():
                    items.append("sessions/")
                if (ws / "SOUL.md").exists():
                    items.append("SOUL.md")
                if (ws / "MEMORY.md").exists():
                    items.append("MEMORY.md")
                detail = ", ".join(items) if items else "empty"
                print(f"      {ws.name}/  ({detail})")
            if len(workspace_dirs) > 5:
                print(f"      ... and {len(workspace_dirs) - 5} more")

        if state_files:
            print()
            print(color(f"  {len(state_files)} state file(s) that could cause confusion:", Colors.YELLOW))
            for path, desc in state_files[:8]:
                print(f"      {desc}")
            if len(state_files) > 8:
                print(f"      ... and {len(state_files) - 8} more")

        print()

        if dry_run:
            archive_path = _archive_directory(source_dir, dry_run=True)
            print_info(f"Would archive: {source_dir} → {archive_path}")
        else:
            if auto_yes or prompt_yes_no(f"Archive {source_dir}?", default=True):
                try:
                    archive_path = _archive_directory(source_dir)
                    print_success(f"Archived: {source_dir} → {archive_path}")
                    total_archived += 1
                except OSError as e:
                    print_error(f"Could not archive: {e}")
                    print_info(f"Try manually: mv {source_dir} {source_dir}.pre-migration")
            else:
                print_info("Skipped.")

    # Summary
    print()
    if dry_run:
        print_info(f"Dry run complete. {len(dirs_to_check)} directory(ies) would be archived.")
        print_info("Run without --dry-run to archive them.")
    elif total_archived:
        print_success(f"Cleaned up {total_archived} OpenClaw directory(ies).")
        print_info("Directories were renamed, not deleted. You can undo by renaming them back.")
    else:
        print_info("No directories were archived.")


def _print_migration_report(report: dict, dry_run: bool):
    """Print a formatted migration report."""
    summary = report.get("summary", {})
    migrated = summary.get("migrated", 0)
    skipped = summary.get("skipped", 0)
    conflicts = summary.get("conflict", 0)
    errors = summary.get("error", 0)

    print()
    if dry_run:
        print_header("Dry Run Results")
        print_info("No files were modified. This is a preview of what would happen.")
    else:
        print_header("Migration Results")

    print()

    # Detailed items
    items = report.get("items", [])
    if items:
        # Group by status
        migrated_items = [i for i in items if i.get("status") == "migrated"]
        skipped_items = [i for i in items if i.get("status") == "skipped"]
        conflict_items = [i for i in items if i.get("status") == "conflict"]
        error_items = [i for i in items if i.get("status") == "error"]

        if migrated_items:
            label = "Would migrate" if dry_run else "Migrated"
            print(color(f"  ✓ {label}:", Colors.GREEN))
            for item in migrated_items:
                kind = item.get("kind", "unknown")
                dest = item.get("destination", "")
                if dest:
                    dest_short = str(dest).replace(str(Path.home()), "~")
                    print(f"      {kind:<22s} → {dest_short}")
                else:
                    print(f"      {kind}")
            print()

        if conflict_items:
            print(color("  ⚠ Conflicts (skipped — use --overwrite to force):", Colors.YELLOW))
            for item in conflict_items:
                kind = item.get("kind", "unknown")
                reason = item.get("reason", "already exists")
                print(f"      {kind:<22s}  {reason}")
            print()

        if skipped_items:
            print(color("  ─ Skipped:", Colors.DIM))
            for item in skipped_items:
                kind = item.get("kind", "unknown")
                reason = item.get("reason", "")
                print(f"      {kind:<22s}  {reason}")
            print()

        if error_items:
            print(color("  ✗ Errors:", Colors.RED))
            for item in error_items:
                kind = item.get("kind", "unknown")
                reason = item.get("reason", "unknown error")
                print(f"      {kind:<22s}  {reason}")
            print()

    # Summary line
    parts = []
    if migrated:
        action = "would migrate" if dry_run else "migrated"
        parts.append(f"{migrated} {action}")
    if conflicts:
        parts.append(f"{conflicts} conflict(s)")
    if skipped:
        parts.append(f"{skipped} skipped")
    if errors:
        parts.append(f"{errors} error(s)")

    if parts:
        print_info(f"Summary: {', '.join(parts)}")
    else:
        print_info("Nothing to migrate.")

    # Output directory
    output_dir = report.get("output_dir")
    if output_dir:
        print_info(f"Full report saved to: {output_dir}")

    if dry_run:
        print()
        print_info("To execute the migration, run without --dry-run:")
        print_info(f"  hermes claw migrate --preset {report.get('preset', 'full')}")
    elif migrated:
        print()
        print_success("Migration complete!")
        # Warn if API keys were skipped (migrate_secrets not enabled)
        skipped_keys = [
            i for i in report.get("items", [])
            if i.get("kind") == "provider-keys" and i.get("status") == "skipped"
        ]
        if skipped_keys:
            print()
            print(color("  ⚠ API keys were NOT migrated (secrets migration is disabled by default).", Colors.YELLOW))
            print(color("  Your OPENROUTER_API_KEY and other provider keys must be added manually.", Colors.YELLOW))
            print()
            print_info("To migrate API keys, re-run with:")
            print_info("  hermes claw migrate --migrate-secrets")
            print()
            print_info("Or add your key manually:")
            print_info("  hermes config set OPENROUTER_API_KEY sk-or-v1-...")