#!/usr/bin/env python3
# /home/Autopartes/pos/migrations/runner.py
"""Apply schema migrations to all tenant databases."""

import os
import sys

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from tenant_db import get_master_conn, get_tenant_conn_by_dbname

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

# Migration registry: version -> filename
MIGRATIONS = {
    "v1.0": "v1.0_initial.sql",
    "v1.1": "v1.1_pos_tables.sql",
    "v1.2": "v1.2_subdomain.sql",
    "v1.3": "v1.3_fleet.sql",
    "v1.4": "v1.4_whatsapp.sql",
    "v1.5": "v1.5_returns.sql",
    "v1.6": "v1.6_marketplace.sql",
    "v1.7": "v1.7_plates.sql",
    "v1.8": "v1.8_performance_indexes.sql",
    "v1.9": "v1.9_redis_cache.sql",
    "v2.0": "v2.0_multi_currency.sql",
    "v2.1": "v2.1_suppliers.sql",
    "v2.2": "v2.2_alerts_warranty.sql",
    "v2.3": "v2.3_metabase.sql",
    "v2.4": "v2.4_crm_enhanced.sql",
    "v2.5": "v2.5_service_orders.sql",
    "v2.6": "v2.6_bnpl_erp.sql",
    "v2.7": "v2.7_notifications.sql",
    "v2.8": "v2.8_savings.sql",
    "v2.9": "v2.9_logistics.sql",
    "v3.0": "v3.0_public_api.sql",
    "v3.1": "v3.1_inventory_vehicle_compat.sql",
    "v3.2": "v3.2_db_performance.sql",
    "v3.2.1": "v3.2_qwen_vehicle_compat.sql",
    "v3.3": "v3.3_marketplace_any_part.sql",
    "v3.3.1": "v3.3_materialized_view.sql",
    "v3.4": "v3.4_meli_integration.sql",
    "v3.5": "v3.5_meli_questions.sql",
    "v3.5.1": "v3.5_whatsapp_state_machine.sql",
    "v3.6": "v3.6_dropshipping.sql",
    "v3.7": "v3.7_sku_aliases.sql",
    "v3.8": "v3.8_supplier_catalog.sql",
    "v3.9": "v3.9_supplier_catalog_prices.sql",
    "v4.0": "v4.0_multi_branch.sql",
    "v4.1": "v4.1_global_invoice.sql",
    "v4.2": "v4.2_meli_sync_queue.sql",
    "v4.3": "v4.3_facturapi.sql",
}


def get_all_tenants():
    """Get all tenants with their current schema version."""
    conn = get_master_conn()
    cur = conn.cursor()
    cur.execute("""
        SELECT t.id, t.db_name, t.name, COALESCE(v.version, 'v0.0') as version
        FROM tenants t
        LEFT JOIN tenant_schema_version v ON t.id = v.tenant_id
        WHERE t.is_active = true
    """)
    tenants = cur.fetchall()
    cur.close()
    conn.close()
    return tenants


def apply_migration(db_name, version):
    """Apply a single migration to a tenant DB."""
    filename = MIGRATIONS[version]
    filepath = os.path.join(MIGRATIONS_DIR, filename)

    if not os.path.exists(filepath):
        print(f"  ERROR: Migration file not found: {filepath}")
        return False

    with open(filepath) as f:
        sql = f.read()

    # Skip migrations marked for manual/non-tenant execution
    first_line = sql.splitlines()[0].strip() if sql.strip() else ""
    if first_line.startswith(": SKIP") or first_line.startswith("-- : SKIP"):
        print("  SKIP (manual/non-tenant migration)")
        return True

    conn = get_tenant_conn_by_dbname(db_name)
    cur = conn.cursor()
    try:
        cur.execute(sql)
        conn.commit()
        return True
    except Exception as e:
        conn.rollback()
        print(f"  ERROR: {e}")
        return False
    finally:
        cur.close()
        conn.close()


def run_migrations():
    """Apply pending migrations to all tenants."""
    tenants = get_all_tenants()
    sorted_versions = sorted(MIGRATIONS.keys())

    print(f"Found {len(tenants)} active tenants")
    print(f"Available migrations: {sorted_versions}")

    for tenant_id, db_name, name, current_version in tenants:
        print(f"\n[{name}] (db={db_name}, current={current_version})")

        for version in sorted_versions:
            if version <= current_version:
                continue

            print(f"  Applying {version}...", end=" ")
            if apply_migration(db_name, version):
                # Update version in master
                master_conn = get_master_conn()
                master_cur = master_conn.cursor()
                master_cur.execute(
                    """
                    INSERT INTO tenant_schema_version (tenant_id, version)
                    VALUES (%s, %s)
                    ON CONFLICT (tenant_id) DO UPDATE SET version = %s, updated_at = NOW()
                """,
                    (tenant_id, version, version),
                )
                master_conn.commit()
                master_cur.close()
                master_conn.close()
                print("OK")
            else:
                print("FAILED — stopping migrations for this tenant")
                break

    print("\nDone.")


if __name__ == "__main__":
    run_migrations()