#!/usr/bin/env python3
"""migrate_legacy_project_names – archiviert Projekte mit ungültigen Namen.

Bug 1+2 Begleit-Skript (Plan v3 §3.6):
- Iteriert über alle Projekte in der DB.
- Prüft jeden Namen gegen PROJECT_NAME_PATTERN + FORBIDDEN_PROJECT_NAMES.
- Markiert ungültige Namen mit status='archived' in project_state (idempotent).
- Bestehende 'active'-Projekte mit ungültigem Namen werden zu 'archived'.
- Bereits archivierte werden NICHT doppelt verändert (idempotent).

Aufruf:
    python3 utils/migrate_legacy_project_names.py [--dry-run] [--verbose]

Defaults:
- --dry-run: nur Report, keine DB-Schreibzugriffe.
- --verbose: zusätzlich pro Projekt-Status ausgeben.

Exit-Code:
- 0: Erfolg (inkl. 0 archivierte Projekte).
- 1: DB-Fehler.
"""
from __future__ import annotations

import argparse
import os
import sys
from typing import List, Tuple

PLUGIN_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

# Run from /a0 to have usr.plugins.* resolvable.
from usr.plugins.a0_software_orchestrator.helpers.db_state_store import (
    _db, _db_error_handler, _validate_project_name,
    PROJECT_NAME_PATTERN, FORBIDDEN_PROJECT_NAMES,
)
from usr.plugins.a0_software_orchestrator.helpers.exceptions import PluginDBError


@_db_error_handler
def list_projects_with_states() -> List[Tuple[int, str, str]]:
    """Returns Liste von (project_id, project_name, current_status).

    Liest aus projects JOIN project_state. Projekte ohne project_state-Eintrag
    bekommen den Status '<none>'.
    """
    db = _db()
    rows = db.conn.execute("""
        SELECT p.id, p.name, COALESCE(ps.status, '<none>') as status
        FROM projects p
        LEFT JOIN project_state ps ON ps.project_id = p.id
        ORDER BY p.id
    """).fetchall()
    return [(int(r[0]), str(r[1]), str(r[2])) for r in rows]


@_db_error_handler
def archive_project(project_id: int, reason: str) -> None:
    """Markiert ein Projekt als 'archived' in project_state. Idempotent.

    Zwei Schritte statt ON CONFLICT DO UPDATE SET mit updated_at: das
    vermeidet sporadische 'no such column: updated_at'-Fehler bei
    cross-Singleton-Connections (zwei verschiedene Modul-Importe der
    PatternDB führen zu zwei Connections auf die gleiche DB-Datei).
    """
    db = _db()
    # 1. Status archivieren (INSERT oder UPDATE)
    db.conn.execute("""
        INSERT INTO project_state (project_id, status, phase, last_active_at, updated_at)
        VALUES (?, 'archived', 'archived', datetime('now'), datetime('now'))
        ON CONFLICT(project_id) DO UPDATE SET
            status = 'archived',
            phase = 'archived',
            last_active_at = datetime('now')
    """, (project_id,))
    # 2. updated_at explizit setzen (separates Statement, robuster)
    db.conn.execute("""
        UPDATE project_state SET updated_at = datetime('now')
        WHERE project_id = ?
    """, (project_id,))
    # NOTE: projects-Tabelle hat kein updated_at-Feld (Spalten: id, name,
    # git_url, description, tech_stack, created_at, project_path, …).
    # Daher kein UPDATE projects hier. Wenn projects.updated_at per
    # Migration ergänzt wird, kann dieser Block nachgerüstet werden.
    db.conn.commit()
    sys.stderr.write(f"  [ARCHIVED] project_id={project_id} reason={reason}\n")


def main() -> int:
    ap = argparse.ArgumentParser(
        description="Archiviere Projekte mit ungültigen Namen (Pattern/Blacklist)."
    )
    ap.add_argument(
        "--dry-run", action="store_true",
        help="Nur anzeigen, welche Projekte archiviert würden; keine DB-Schreibzugriffe.",
    )
    ap.add_argument(
        "--verbose", "-v", action="store_true",
        help="Zusätzlich pro Projekt den Validierungs-Status ausgeben.",
    )
    args = ap.parse_args()

    try:
        projects = list_projects_with_states()
    except PluginDBError as e:
        print(f"ERROR: DB-Fehler beim Lesen der Projekte: {e}", file=sys.stderr)
        return 1

    if not projects:
        print("No projects found in DB.")
        return 0

    print(f"=== Legacy-Name Migration (dry-run={args.dry_run}) ===")
    print(f"Pattern: {PROJECT_NAME_PATTERN.pattern}")
    print(f"Blacklist: {sorted(FORBIDDEN_PROJECT_NAMES)}")
    print(f"Projects in DB: {len(projects)}")
    print()

    active_count = 0
    archived_count = 0
    already_archived_count = 0
    invalid_count = 0

    for pid, name, current_status in projects:
        try:
            _validate_project_name(name)
            valid = True
            invalid_reason = None
        except ValueError as e:
            valid = False
            invalid_reason = str(e)

        if valid:
            active_count += 1
            if args.verbose:
                print(f"  [OK ] pid={pid:3d} name={name!r:40s} status={current_status}")
            continue

        invalid_count += 1
        if current_status == "archived":
            already_archived_count += 1
            print(f"  [SKIP] pid={pid:3d} name={name!r} already archived; invalid={invalid_reason}")
            continue

        print(f"  [BAD ] pid={pid:3d} name={name!r} status={current_status} reason={invalid_reason}")
        if not args.dry_run:
            try:
                archive_project(pid, reason=invalid_reason)
                archived_count += 1
            except PluginDBError as e:
                print(f"ERROR: konnte pid={pid} nicht archivieren: {e}", file=sys.stderr)
                return 1

    print()
    print(f"Summary:")
    print(f"  total projects:      {len(projects)}")
    print(f"  valid (active):      {active_count}")
    print(f"  invalid (total):     {invalid_count}")
    print(f"    newly archived:    {archived_count}")
    print(f"    already archived:  {already_archived_count}")
    print(f"  mode:                {'DRY-RUN' if args.dry_run else 'APPLIED'}")

    return 0


if __name__ == "__main__":
    sys.exit(main())