#!/usr/bin/env python3
"""
Production Database Initialization for Wizamart Platform

This script initializes ESSENTIAL data required for production:
- Platform admin user
- Default vendor roles and permissions
- Admin settings
- Platform configuration

This is SAFE to run in production and should be run after migrations.

Usage:
    make init-prod

This script is idempotent - safe to run multiple times.
"""

import sys
from datetime import UTC, datetime
from pathlib import Path

# Add project root to path
project_root = Path(__file__).parent.parent
sys.path.insert(0, str(project_root))

from sqlalchemy import select
from sqlalchemy.orm import Session

from app.core.config import (
    print_environment_info,
    settings,
    validate_production_settings,
)
from app.core.database import SessionLocal
from app.core.environment import is_production
from app.core.permissions import PermissionGroups
from middleware.auth import AuthManager
from app.modules.tenancy.models import AdminSetting
from app.modules.tenancy.models import User

# =============================================================================
# HELPER FUNCTIONS
# =============================================================================


def print_header(text: str):
    """Print formatted header."""
    print("\n" + "=" * 70)
    print(f"  {text}")
    print("=" * 70)


def print_step(step: int, text: str):
    """Print step indicator."""
    print(f"\n[{step}] {text}")


def print_success(text: str):
    """Print success message."""
    print(f"  ✓ {text}")


def print_warning(text: str):
    """Print warning message."""
    print(f"  ⚠ {text}")


def print_error(text: str):
    """Print error message."""
    print(f"  ✗ {text}")


# =============================================================================
# INITIALIZATION FUNCTIONS
# =============================================================================


def create_admin_user(db: Session, auth_manager: AuthManager) -> User:
    """Create or get the platform admin user."""

    # Check if admin already exists
    admin = db.execute(
        select(User).where(User.email == settings.admin_email)
    ).scalar_one_or_none()

    if admin:
        print_warning(f"Admin user already exists: {admin.email}")
        return admin

    # Create new admin
    hashed_password = auth_manager.hash_password(settings.admin_password)

    admin = User(
        username=settings.admin_username,
        email=settings.admin_email,
        hashed_password=hashed_password,
        role="admin",
        first_name=settings.admin_first_name,
        last_name=settings.admin_last_name,
        is_active=True,
        is_email_verified=True,
        created_at=datetime.now(UTC),
        updated_at=datetime.now(UTC),
    )

    db.add(admin)
    db.flush()

    print_success(f"Created admin user: {admin.email}")
    return admin


def create_default_role_templates(db: Session) -> dict:
    """Create default role templates (not tied to any vendor).

    These serve as templates that can be copied when creating vendor-specific roles.
    Note: Actual roles are vendor-specific and created when vendors are onboarded.
    """

    print("  Available role presets:")
    print("  - Manager:   Nearly full access (except team management)")
    print("  - Staff:     Day-to-day operations")
    print("  - Support:   Customer service focused")
    print("  - Viewer:    Read-only access")
    print("  - Marketing: Marketing and customer communication")

    print_success("Role templates ready for vendor onboarding")

    return {
        "manager": list(PermissionGroups.MANAGER),
        "staff": list(PermissionGroups.STAFF),
        "support": list(PermissionGroups.SUPPORT),
        "viewer": list(PermissionGroups.VIEWER),
        "marketing": list(PermissionGroups.MARKETING),
    }


def create_admin_settings(db: Session) -> int:
    """Create essential admin settings."""

    settings_created = 0

    # Essential platform settings
    default_settings = [
        {
            "key": "platform_name",
            "value": settings.project_name,
            "value_type": "string",
            "description": "Platform name displayed in admin panel",
            "is_public": True,
        },
        {
            "key": "platform_url",
            "value": f"https://{settings.platform_domain}",
            "value_type": "string",
            "description": "Main platform URL",
            "is_public": True,
        },
        {
            "key": "support_email",
            "value": f"support@{settings.platform_domain}",
            "value_type": "string",
            "description": "Platform support email",
            "is_public": True,
        },
        {
            "key": "max_vendors_per_user",
            "value": str(settings.max_vendors_per_user),
            "value_type": "integer",
            "description": "Maximum vendors a user can own",
            "is_public": False,
        },
        {
            "key": "max_team_members_per_vendor",
            "value": str(settings.max_team_members_per_vendor),
            "value_type": "integer",
            "description": "Maximum team members per vendor",
            "is_public": False,
        },
        {
            "key": "invitation_expiry_days",
            "value": str(settings.invitation_expiry_days),
            "value_type": "integer",
            "description": "Days until team invitation expires",
            "is_public": False,
        },
        {
            "key": "require_vendor_verification",
            "value": "true",
            "value_type": "boolean",
            "description": "Require admin verification for new vendors",
            "is_public": False,
        },
        {
            "key": "allow_custom_domains",
            "value": str(settings.allow_custom_domains).lower(),
            "value_type": "boolean",
            "description": "Allow vendors to use custom domains",
            "is_public": False,
        },
        {
            "key": "maintenance_mode",
            "value": "false",
            "value_type": "boolean",
            "description": "Enable maintenance mode",
            "is_public": True,
        },
        # Logging settings
        {
            "key": "log_level",
            "value": "INFO",
            "value_type": "string",
            "category": "logging",
            "description": "Application log level (DEBUG, INFO, WARNING, ERROR, CRITICAL)",
            "is_public": False,
        },
        {
            "key": "log_file_max_size_mb",
            "value": "10",
            "value_type": "integer",
            "category": "logging",
            "description": "Maximum log file size in MB before rotation",
            "is_public": False,
        },
        {
            "key": "log_file_backup_count",
            "value": "5",
            "value_type": "integer",
            "category": "logging",
            "description": "Number of rotated log files to keep",
            "is_public": False,
        },
        {
            "key": "db_log_retention_days",
            "value": "30",
            "value_type": "integer",
            "category": "logging",
            "description": "Number of days to retain logs in database",
            "is_public": False,
        },
        {
            "key": "file_logging_enabled",
            "value": "true",
            "value_type": "boolean",
            "category": "logging",
            "description": "Enable file-based logging",
            "is_public": False,
        },
        {
            "key": "db_logging_enabled",
            "value": "true",
            "value_type": "boolean",
            "category": "logging",
            "description": "Enable database logging for critical events",
            "is_public": False,
        },
    ]

    for setting_data in default_settings:
        # Check if setting already exists
        existing = db.execute(
            select(AdminSetting).where(AdminSetting.key == setting_data["key"])
        ).scalar_one_or_none()

        if not existing:
            setting = AdminSetting(
                key=setting_data["key"],
                value=setting_data["value"],
                value_type=setting_data["value_type"],
                category=setting_data.get("category"),
                description=setting_data.get("description"),
                is_public=setting_data.get("is_public", False),
                created_at=datetime.now(UTC),
                updated_at=datetime.now(UTC),
            )
            db.add(setting)
            settings_created += 1

    db.flush()

    if settings_created > 0:
        print_success(f"Created {settings_created} admin settings")
    else:
        print_warning("Admin settings already exist")

    return settings_created


def verify_rbac_schema(db: Session) -> bool:
    """Verify that RBAC schema is in place."""

    try:
        from sqlalchemy import inspect

        inspector = inspect(db.bind)
        tables = inspector.get_table_names()

        # Check users table has is_email_verified
        if "users" in tables:
            user_cols = {col["name"] for col in inspector.get_columns("users")}
            if "is_email_verified" not in user_cols:
                print_error("Missing 'is_email_verified' column in users table")
                return False

        # Check vendor_users has RBAC columns
        if "vendor_users" in tables:
            vu_cols = {col["name"] for col in inspector.get_columns("vendor_users")}
            required_cols = {
                "user_type",
                "invitation_token",
                "invitation_sent_at",
                "invitation_accepted_at",
            }
            missing = required_cols - vu_cols
            if missing:
                print_error(f"Missing columns in vendor_users: {missing}")
                return False

        # Check roles table exists
        if "roles" not in tables:
            print_error("Missing 'roles' table")
            return False

        print_success("RBAC schema verified")
        return True

    except Exception as e:
        print_error(f"Schema verification failed: {e}")
        return False


# =============================================================================
# MAIN INITIALIZATION
# =============================================================================


def initialize_production(db: Session, auth_manager: AuthManager):
    """Initialize production database with essential data."""

    print_header("PRODUCTION INITIALIZATION")

    # Step 1: Verify RBAC schema
    print_step(1, "Verifying RBAC schema...")
    if not verify_rbac_schema(db):
        print_error("RBAC schema not ready. Run migrations first:")
        print("  make migrate-up")
        sys.exit(1)

    # Step 2: Create admin user
    print_step(2, "Creating platform admin...")
    admin = create_admin_user(db, auth_manager)

    # Step 3: Set up default role templates
    print_step(3, "Setting up role templates...")
    role_templates = create_default_role_templates(db)

    # Step 4: Create admin settings
    print_step(4, "Creating admin settings...")
    create_admin_settings(db)

    # Commit all changes
    db.commit()
    print_success("All changes committed")


def print_summary(db: Session):
    """Print initialization summary."""

    print_header("INITIALIZATION SUMMARY")

    # Count records
    user_count = db.query(User).filter(User.role == "admin").count()
    setting_count = db.query(AdminSetting).count()

    print("\n📊 Database Status:")
    print(f"  Admin users:     {user_count}")
    print(f"  Admin settings:  {setting_count}")

    print("\n" + "─" * 70)
    print("🔐 ADMIN CREDENTIALS")
    print("─" * 70)
    print("  URL:      /admin/login")
    print(f"  Username: {settings.admin_username}")
    print(f"  Password: {settings.admin_password}")
    print("─" * 70)

    # Show security warnings if in production
    if is_production():
        warnings = validate_production_settings()
        if warnings:
            print("\n⚠️  SECURITY WARNINGS:")
            for warning in warnings:
                print(f"  {warning}")
            print("\n  Please update your .env file with secure values!")
    else:
        print("\n⚠️  DEVELOPMENT MODE:")
        print("  Default credentials are OK for development")
        print("  Change them in production via .env file")

    print("\n🚀 NEXT STEPS:")
    print("  1. Login to admin panel")
    if is_production():
        print("  2. CHANGE DEFAULT PASSWORD IMMEDIATELY!")
        print("  3. Configure admin settings")
        print("  4. Create first vendor")
    else:
        print("  2. Create demo data: make seed-demo")
        print("  3. Start development: make dev")

    print("\n📝 FOR DEMO DATA (Development only):")
    print("  make seed-demo")


# =============================================================================
# MAIN ENTRY POINT
# =============================================================================


def main():
    """Main entry point."""

    print("\n" + "╔" + "═" * 68 + "╗")
    print("║" + " " * 16 + "PRODUCTION INITIALIZATION" + " " * 27 + "║")
    print("╚" + "═" * 68 + "╝")

    # Show environment info
    print_environment_info()

    # Production safety check
    if is_production():
        warnings = validate_production_settings()
        if warnings:
            print("\n⚠️  PRODUCTION WARNINGS DETECTED:")
            for warning in warnings:
                print(f"  {warning}")
            print("\nUpdate your .env file before continuing!")

            response = input("\nContinue anyway? (yes/no): ")
            if response.lower() != "yes":
                print("Initialization cancelled.")
                sys.exit(0)

    db = SessionLocal()
    auth_manager = AuthManager()

    try:
        initialize_production(db, auth_manager)
        print_summary(db)

        print_header("✅ INITIALIZATION COMPLETED")

    except KeyboardInterrupt:
        db.rollback()
        print("\n\n⚠️  Initialization interrupted")
        sys.exit(1)

    except Exception as e:
        db.rollback()
        print_header("❌ INITIALIZATION FAILED")
        print(f"\nError: {e}\n")
        import traceback

        traceback.print_exc()
        sys.exit(1)

    finally:
        db.close()


if __name__ == "__main__":
    main()