#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Demo Inventory Seeding Script for Inventory Service
Creates realistic Spanish ingredients for demo template tenants

This script runs as a Kubernetes init job inside the inventory-service container.
It populates the template tenants with a comprehensive catalog of ingredients.

Usage:
    python /app/scripts/demo/seed_demo_inventory.py

Environment Variables Required:
    INVENTORY_DATABASE_URL - PostgreSQL connection string for inventory database
    DEMO_MODE - Set to 'production' for production seeding
    LOG_LEVEL - Logging level (default: INFO)
"""

import asyncio
import uuid
import sys
import os
import json
from datetime import datetime, timezone
from pathlib import Path

# Add app to path
sys.path.insert(0, str(Path(__file__).parent.parent.parent))

from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy import select
import structlog

from app.models.inventory import Ingredient

# Configure logging
structlog.configure(
    processors=[
        structlog.stdlib.add_log_level,
        structlog.processors.TimeStamper(fmt="iso"),
        structlog.dev.ConsoleRenderer()
    ]
)

logger = structlog.get_logger()

# Fixed Demo Tenant IDs (must match tenant service)
DEMO_TENANT_SAN_PABLO = uuid.UUID("a1b2c3d4-e5f6-47a8-b9c0-d1e2f3a4b5c6")
DEMO_TENANT_LA_ESPIGA = uuid.UUID("b2c3d4e5-f6a7-48b9-c0d1-e2f3a4b5c6d7")


def load_ingredients_data():
    """Load ingredients data from JSON file"""
    # Look for data file in the same directory as this script
    data_file = Path(__file__).parent / "ingredientes_es.json"

    if not data_file.exists():
        raise FileNotFoundError(
            f"Ingredients data file not found: {data_file}. "
            "Make sure ingredientes_es.json is in the same directory as this script."
        )

    logger.info("Loading ingredients data", file=str(data_file))

    with open(data_file, 'r', encoding='utf-8') as f:
        data = json.load(f)

    # Flatten all ingredient categories into a single list
    all_ingredients = []
    for category_name, ingredients in data.items():
        logger.debug(f"Loading category: {category_name} ({len(ingredients)} items)")
        all_ingredients.extend(ingredients)

    logger.info(f"Loaded {len(all_ingredients)} ingredients from JSON")
    return all_ingredients


async def seed_ingredients_for_tenant(
    db: AsyncSession,
    tenant_id: uuid.UUID,
    tenant_name: str,
    ingredients_data: list
) -> dict:
    """
    Seed ingredients for a specific tenant using pre-defined UUIDs

    Args:
        db: Database session
        tenant_id: UUID of the tenant
        tenant_name: Name of the tenant (for logging)
        ingredients_data: List of ingredient dictionaries with pre-defined IDs

    Returns:
        Dict with seeding statistics
    """
    logger.info("─" * 80)
    logger.info(f"Seeding ingredients for: {tenant_name}")
    logger.info(f"Tenant ID: {tenant_id}")
    logger.info("─" * 80)

    created_count = 0
    updated_count = 0
    skipped_count = 0

    for ing_data in ingredients_data:
        sku = ing_data["sku"]
        name = ing_data["name"]

        # Check if ingredient already exists for this tenant with this SKU
        result = await db.execute(
            select(Ingredient).where(
                Ingredient.tenant_id == tenant_id,
                Ingredient.sku == sku
            )
        )
        existing_ingredient = result.scalars().first()

        if existing_ingredient:
            logger.debug(f"   ⏭️  Skipping (exists): {sku} - {name}")
            skipped_count += 1
            continue

        # Generate tenant-specific UUID by combining base UUID with tenant ID
        # This ensures each tenant has unique IDs but they're deterministic (same on re-run)
        base_id = uuid.UUID(ing_data["id"])
        # XOR the base ID with the tenant ID to create a tenant-specific ID
        tenant_int = int(tenant_id.hex, 16)
        base_int = int(base_id.hex, 16)
        ingredient_id = uuid.UUID(int=tenant_int ^ base_int)

        # Create new ingredient
        ingredient = Ingredient(
            id=ingredient_id,
            tenant_id=tenant_id,
            name=name,
            sku=sku,
            barcode=None,  # Could generate EAN-13 barcodes if needed
            product_type=ing_data["product_type"],
            ingredient_category=ing_data["ingredient_category"],
            product_category=ing_data["product_category"],
            subcategory=ing_data.get("subcategory"),
            description=ing_data["description"],
            brand=ing_data.get("brand"),
            unit_of_measure=ing_data["unit_of_measure"],
            package_size=None,
            average_cost=ing_data["average_cost"],
            last_purchase_price=ing_data["average_cost"],
            standard_cost=ing_data["average_cost"],
            low_stock_threshold=ing_data.get("low_stock_threshold", 10.0),
            reorder_point=ing_data.get("reorder_point", 20.0),
            reorder_quantity=ing_data.get("reorder_point", 20.0) * 2,
            max_stock_level=ing_data.get("reorder_point", 20.0) * 5,
            shelf_life_days=ing_data.get("shelf_life_days"),
            is_perishable=ing_data.get("is_perishable", False),
            is_active=True,
            allergen_info=ing_data.get("allergen_info", []),
            # NEW: Local production support (Sprint 5)
            produced_locally=ing_data.get("produced_locally", False),
            recipe_id=uuid.UUID(ing_data["recipe_id"]) if ing_data.get("recipe_id") else None,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )

        db.add(ingredient)
        created_count += 1

        logger.debug(f"   ✅ Created: {sku} - {name}")

    # Commit all changes for this tenant
    await db.commit()

    logger.info(f"   📊 Created: {created_count}, Skipped: {skipped_count}")
    logger.info("")

    return {
        "tenant_id": str(tenant_id),
        "tenant_name": tenant_name,
        "created": created_count,
        "skipped": skipped_count,
        "total": len(ingredients_data)
    }


async def seed_inventory(db: AsyncSession):
    """
    Seed inventory for all demo template tenants

    Args:
        db: Database session

    Returns:
        Dict with overall seeding statistics
    """
    logger.info("=" * 80)
    logger.info("📦 Starting Demo Inventory Seeding")
    logger.info("=" * 80)

    # Load ingredients data once
    try:
        ingredients_data = load_ingredients_data()
    except FileNotFoundError as e:
        logger.error(str(e))
        raise

    results = []

    # Seed for San Pablo (Traditional Bakery)
    logger.info("")
    result_san_pablo = await seed_ingredients_for_tenant(
        db,
        DEMO_TENANT_SAN_PABLO,
        "Panadería San Pablo (Traditional)",
        ingredients_data
    )
    results.append(result_san_pablo)

    # Seed for La Espiga (Central Workshop)
    result_la_espiga = await seed_ingredients_for_tenant(
        db,
        DEMO_TENANT_LA_ESPIGA,
        "Panadería La Espiga (Central Workshop)",
        ingredients_data
    )
    results.append(result_la_espiga)

    # Calculate totals
    total_created = sum(r["created"] for r in results)
    total_skipped = sum(r["skipped"] for r in results)

    logger.info("=" * 80)
    logger.info("✅ Demo Inventory Seeding Completed")
    logger.info("=" * 80)

    return {
        "service": "inventory",
        "tenants_seeded": len(results),
        "total_created": total_created,
        "total_skipped": total_skipped,
        "results": results
    }


async def main():
    """Main execution function"""

    logger.info("Demo Inventory Seeding Script Starting")
    logger.info("Mode: %s", os.getenv("DEMO_MODE", "development"))
    logger.info("Log Level: %s", os.getenv("LOG_LEVEL", "INFO"))

    # Get database URL from environment
    database_url = os.getenv("INVENTORY_DATABASE_URL") or os.getenv("DATABASE_URL")
    if not database_url:
        logger.error("❌ INVENTORY_DATABASE_URL or DATABASE_URL environment variable must be set")
        return 1

    # Convert to async URL if needed
    if database_url.startswith("postgresql://"):
        database_url = database_url.replace("postgresql://", "postgresql+asyncpg://", 1)

    logger.info("Connecting to inventory database")

    # Create engine and session
    engine = create_async_engine(
        database_url,
        echo=False,
        pool_pre_ping=True,
        pool_size=5,
        max_overflow=10
    )

    async_session = sessionmaker(
        engine,
        class_=AsyncSession,
        expire_on_commit=False
    )

    try:
        async with async_session() as session:
            result = await seed_inventory(session)

            logger.info("")
            logger.info("📊 Seeding Summary:")
            logger.info(f"   ✅ Tenants seeded: {result['tenants_seeded']}")
            logger.info(f"   ✅ Total created:  {result['total_created']}")
            logger.info(f"   ⏭️  Total skipped:  {result['total_skipped']}")
            logger.info("")

            # Print per-tenant details
            for tenant_result in result['results']:
                logger.info(
                    f"   {tenant_result['tenant_name']}: "
                    f"{tenant_result['created']} created, {tenant_result['skipped']} skipped"
                )

            logger.info("")
            logger.info("🎉 Success! Ingredient catalog is ready for cloning.")
            logger.info("")
            logger.info("Ingredients by category:")
            logger.info("  • Harinas: 6 tipos (T55, T65, Fuerza, Integral, Centeno, Espelta)")
            logger.info("  • Lácteos: 4 tipos (Mantequilla, Leche, Nata, Huevos)")
            logger.info("  • Levaduras: 3 tipos (Fresca, Seca, Masa Madre)")
            logger.info("  • Básicos: 3 tipos (Sal, Azúcar, Agua)")
            logger.info("  • Especiales: 5 tipos (Chocolate, Almendras, etc.)")
            logger.info("  • Productos: 3 referencias")
            logger.info("")
            logger.info("Next steps:")
            logger.info("  1. Run seed jobs for other services (recipes, suppliers, etc.)")
            logger.info("  2. Verify ingredient data in database")
            logger.info("  3. Test demo session creation with inventory cloning")
            logger.info("")

            return 0

    except Exception as e:
        logger.error("=" * 80)
        logger.error("❌ Demo Inventory Seeding Failed")
        logger.error("=" * 80)
        logger.error("Error: %s", str(e))
        logger.error("", exc_info=True)
        return 1

    finally:
        await engine.dispose()


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