# app/modules/orders/models/order.py
"""
Unified Order model for all sales channels.

Supports:
- Direct orders (from store's own storefront)
- Marketplace orders (Letzshop, etc.)

Design principles:
- Customer/address data is snapshotted at order time (preserves history)
- customer_id FK links to Customer record (may be inactive for marketplace imports)
- channel field distinguishes order source
- external_* fields store marketplace-specific references

Money values are stored as integer cents (e.g., €105.91 = 10591).
See docs/architecture/money-handling.md for details.
"""

from typing import TYPE_CHECKING

from sqlalchemy import (
    Boolean,
    Column,
    DateTime,
    ForeignKey,
    Index,
    Integer,
    Numeric,
    String,
    Text,
)

if TYPE_CHECKING:
    pass
from sqlalchemy.dialects.sqlite import JSON
from sqlalchemy.orm import relationship

from app.core.database import Base
from app.utils.money import cents_to_euros, euros_to_cents
from models.database.base import SoftDeleteMixin, TimestampMixin


class Order(Base, TimestampMixin, SoftDeleteMixin):
    """
    Unified order model for all sales channels.

    Stores orders from direct sales and marketplaces (Letzshop, etc.)
    with snapshotted customer and address data.

    All monetary amounts are stored as integer cents for precision.
    """

    __tablename__ = "orders"

    id = Column(Integer, primary_key=True, index=True)
    store_id = Column(Integer, ForeignKey("stores.id"), nullable=False, index=True)
    customer_id = Column(
        Integer, ForeignKey("customers.id"), nullable=False, index=True
    )
    order_number = Column(String(100), nullable=False, unique=True, index=True)

    # === Channel/Source ===
    channel = Column(
        String(50), default="direct", nullable=False, index=True
    )  # direct, letzshop

    # External references (for marketplace orders)
    external_order_id = Column(
        String(100), nullable=True, index=True
    )  # Marketplace order ID
    external_shipment_id = Column(
        String(100), nullable=True, index=True
    )  # Marketplace shipment ID
    external_order_number = Column(String(100), nullable=True)  # Marketplace order #
    external_data = Column(JSON, nullable=True)  # Raw marketplace data for debugging

    # === Status ===
    # pending: awaiting confirmation
    # processing: confirmed, being prepared
    # shipped: shipped with tracking
    # delivered: delivered to customer
    # cancelled: order cancelled/declined
    # refunded: order refunded
    status = Column(String(50), nullable=False, default="pending", index=True)

    # === Financials (stored as integer cents) ===
    subtotal_cents = Column(Integer, nullable=True)  # May not be available from marketplace
    tax_amount_cents = Column(Integer, nullable=True)
    shipping_amount_cents = Column(Integer, nullable=True)
    discount_amount_cents = Column(Integer, nullable=True)
    total_amount_cents = Column(Integer, nullable=False)
    currency = Column(String(10), default="EUR")

    # === VAT Information ===
    # VAT regime: domestic, oss, reverse_charge, origin, exempt
    vat_regime = Column(String(20), nullable=True)
    # VAT rate as percentage (e.g., 17.00 for 17%)
    vat_rate = Column(Numeric(5, 2), nullable=True)
    # Human-readable VAT label (e.g., "Luxembourg VAT 17%")
    vat_rate_label = Column(String(100), nullable=True)
    # Destination country for cross-border sales (ISO code)
    vat_destination_country = Column(String(2), nullable=True)

    # === Customer Snapshot (preserved at order time) ===
    customer_first_name = Column(String(100), nullable=False)
    customer_last_name = Column(String(100), nullable=False)
    customer_email = Column(String(255), nullable=False)
    customer_phone = Column(String(50), nullable=True)
    customer_locale = Column(String(10), nullable=True)  # en, fr, de, lb

    # === Shipping Address Snapshot ===
    ship_first_name = Column(String(100), nullable=False)
    ship_last_name = Column(String(100), nullable=False)
    ship_company = Column(String(200), nullable=True)
    ship_address_line_1 = Column(String(255), nullable=False)
    ship_address_line_2 = Column(String(255), nullable=True)
    ship_city = Column(String(100), nullable=False)
    ship_postal_code = Column(String(20), nullable=False)
    ship_country_iso = Column(String(5), nullable=False)

    # === Billing Address Snapshot ===
    bill_first_name = Column(String(100), nullable=False)
    bill_last_name = Column(String(100), nullable=False)
    bill_company = Column(String(200), nullable=True)
    bill_address_line_1 = Column(String(255), nullable=False)
    bill_address_line_2 = Column(String(255), nullable=True)
    bill_city = Column(String(100), nullable=False)
    bill_postal_code = Column(String(20), nullable=False)
    bill_country_iso = Column(String(5), nullable=False)

    # === Tracking ===
    shipping_method = Column(String(100), nullable=True)
    tracking_number = Column(String(100), nullable=True)
    tracking_provider = Column(String(100), nullable=True)
    tracking_url = Column(String(500), nullable=True)  # Full tracking URL
    shipment_number = Column(String(100), nullable=True)  # Carrier shipment number (e.g., H74683403433)
    shipping_carrier = Column(String(50), nullable=True)  # Carrier code (greco, colissimo, etc.)

    # === Notes ===
    customer_notes = Column(Text, nullable=True)
    internal_notes = Column(Text, nullable=True)

    # === Timestamps ===
    order_date = Column(
        DateTime(timezone=True), nullable=False
    )  # When customer placed order
    confirmed_at = Column(DateTime(timezone=True), nullable=True)
    shipped_at = Column(DateTime(timezone=True), nullable=True)
    delivered_at = Column(DateTime(timezone=True), nullable=True)
    cancelled_at = Column(DateTime(timezone=True), nullable=True)

    # === Relationships ===
    store = relationship("Store")
    customer = relationship("Customer", back_populates="orders")
    items = relationship(
        "OrderItem", back_populates="order", cascade="all, delete-orphan"
    )
    invoices = relationship(
        "Invoice", back_populates="order", cascade="all, delete-orphan"
    )

    # Composite indexes for common queries
    __table_args__ = (
        Index("idx_order_store_status", "store_id", "status"),
        Index("idx_order_store_channel", "store_id", "channel"),
        Index("idx_order_store_date", "store_id", "order_date"),
    )

    def __repr__(self):
        return f"<Order(id={self.id}, order_number='{self.order_number}', channel='{self.channel}', status='{self.status}')>"

    # === PRICE PROPERTIES (Euro convenience accessors) ===

    @property
    def subtotal(self) -> float | None:
        """Get subtotal in euros."""
        if self.subtotal_cents is not None:
            return cents_to_euros(self.subtotal_cents)
        return None

    @subtotal.setter
    def subtotal(self, value: float | None):
        """Set subtotal from euros."""
        self.subtotal_cents = euros_to_cents(value) if value is not None else None

    @property
    def tax_amount(self) -> float | None:
        """Get tax amount in euros."""
        if self.tax_amount_cents is not None:
            return cents_to_euros(self.tax_amount_cents)
        return None

    @tax_amount.setter
    def tax_amount(self, value: float | None):
        """Set tax amount from euros."""
        self.tax_amount_cents = euros_to_cents(value) if value is not None else None

    @property
    def shipping_amount(self) -> float | None:
        """Get shipping amount in euros."""
        if self.shipping_amount_cents is not None:
            return cents_to_euros(self.shipping_amount_cents)
        return None

    @shipping_amount.setter
    def shipping_amount(self, value: float | None):
        """Set shipping amount from euros."""
        self.shipping_amount_cents = euros_to_cents(value) if value is not None else None

    @property
    def discount_amount(self) -> float | None:
        """Get discount amount in euros."""
        if self.discount_amount_cents is not None:
            return cents_to_euros(self.discount_amount_cents)
        return None

    @discount_amount.setter
    def discount_amount(self, value: float | None):
        """Set discount amount from euros."""
        self.discount_amount_cents = euros_to_cents(value) if value is not None else None

    @property
    def total_amount(self) -> float:
        """Get total amount in euros."""
        return cents_to_euros(self.total_amount_cents)

    @total_amount.setter
    def total_amount(self, value: float):
        """Set total amount from euros."""
        self.total_amount_cents = euros_to_cents(value)

    # === NAME PROPERTIES ===

    @property
    def customer_full_name(self) -> str:
        """Customer full name from snapshot."""
        return f"{self.customer_first_name} {self.customer_last_name}".strip()

    @property
    def ship_full_name(self) -> str:
        """Shipping address full name."""
        return f"{self.ship_first_name} {self.ship_last_name}".strip()

    @property
    def bill_full_name(self) -> str:
        """Billing address full name."""
        return f"{self.bill_first_name} {self.bill_last_name}".strip()

    @property
    def is_marketplace_order(self) -> bool:
        """Check if this is a marketplace order."""
        return self.channel != "direct"

    @property
    def is_fully_shipped(self) -> bool:
        """Check if all items are fully shipped."""
        if not self.items:
            return False
        return all(item.is_fully_shipped for item in self.items)

    @property
    def is_partially_shipped(self) -> bool:
        """Check if some items are shipped but not all."""
        if not self.items:
            return False
        has_shipped = any(item.shipped_quantity > 0 for item in self.items)
        all_shipped = all(item.is_fully_shipped for item in self.items)
        return has_shipped and not all_shipped

    @property
    def shipped_item_count(self) -> int:
        """Count of fully shipped items."""
        return sum(1 for item in self.items if item.is_fully_shipped)

    @property
    def total_shipped_units(self) -> int:
        """Total quantity shipped across all items."""
        return sum(item.shipped_quantity for item in self.items)

    @property
    def total_ordered_units(self) -> int:
        """Total quantity ordered across all items."""
        return sum(item.quantity for item in self.items)


class OrderItem(Base, TimestampMixin):
    """
    Individual items in an order.

    Stores product snapshot at time of order plus external references
    for marketplace items.

    All monetary amounts are stored as integer cents for precision.
    """

    __tablename__ = "order_items"

    id = Column(Integer, primary_key=True, index=True)
    order_id = Column(Integer, ForeignKey("orders.id"), nullable=False, index=True)
    product_id = Column(Integer, ForeignKey("products.id"), nullable=False)

    # === Product Snapshot (preserved at order time) ===
    product_name = Column(String(255), nullable=False)
    product_sku = Column(String(100), nullable=True)
    gtin = Column(String(50), nullable=True)  # EAN/UPC/ISBN etc.
    gtin_type = Column(String(20), nullable=True)  # ean13, upc, isbn, etc.

    # === Pricing (stored as integer cents) ===
    quantity = Column(Integer, nullable=False)
    unit_price_cents = Column(Integer, nullable=False)
    total_price_cents = Column(Integer, nullable=False)

    # === External References (for marketplace items) ===
    external_item_id = Column(String(100), nullable=True)  # e.g., Letzshop inventory unit ID
    external_variant_id = Column(String(100), nullable=True)  # e.g., Letzshop variant ID

    # === Item State (for marketplace confirmation flow) ===
    # confirmed_available: item confirmed and available
    # confirmed_unavailable: item confirmed but not available (declined)
    item_state = Column(String(50), nullable=True)

    # === Inventory Tracking ===
    inventory_reserved = Column(Boolean, default=False)
    inventory_fulfilled = Column(Boolean, default=False)

    # === Shipment Tracking ===
    shipped_quantity = Column(Integer, default=0, nullable=False)  # Units shipped so far

    # === Exception Tracking ===
    # True if product was not found by GTIN during import (linked to placeholder)
    needs_product_match = Column(Boolean, default=False, index=True)

    # === Relationships ===
    order = relationship("Order", back_populates="items")
    product = relationship("Product")
    exception = relationship(
        "OrderItemException",
        back_populates="order_item",
        uselist=False,
        cascade="all, delete-orphan",
    )

    def __repr__(self):
        return f"<OrderItem(id={self.id}, order_id={self.order_id}, product_id={self.product_id}, gtin='{self.gtin}')>"

    # === PRICE PROPERTIES (Euro convenience accessors) ===

    @property
    def unit_price(self) -> float:
        """Get unit price in euros."""
        return cents_to_euros(self.unit_price_cents)

    @unit_price.setter
    def unit_price(self, value: float):
        """Set unit price from euros."""
        self.unit_price_cents = euros_to_cents(value)

    @property
    def total_price(self) -> float:
        """Get total price in euros."""
        return cents_to_euros(self.total_price_cents)

    @total_price.setter
    def total_price(self, value: float):
        """Set total price from euros."""
        self.total_price_cents = euros_to_cents(value)

    # === STATUS PROPERTIES ===

    @property
    def is_confirmed(self) -> bool:
        """Check if item has been confirmed (available or unavailable)."""
        return self.item_state in ("confirmed_available", "confirmed_unavailable")

    @property
    def is_available(self) -> bool:
        """Check if item is confirmed as available."""
        return self.item_state == "confirmed_available"

    @property
    def is_declined(self) -> bool:
        """Check if item was declined (unavailable)."""
        return self.item_state == "confirmed_unavailable"

    @property
    def has_unresolved_exception(self) -> bool:
        """Check if item has an unresolved exception blocking confirmation."""
        if not self.exception:
            return False
        return self.exception.blocks_confirmation

    # === SHIPMENT PROPERTIES ===

    @property
    def remaining_quantity(self) -> int:
        """Quantity not yet shipped."""
        return max(0, self.quantity - self.shipped_quantity)

    @property
    def is_fully_shipped(self) -> bool:
        """Check if all units have been shipped."""
        return self.shipped_quantity >= self.quantity

    @property
    def is_partially_shipped(self) -> bool:
        """Check if some but not all units have been shipped."""
        return 0 < self.shipped_quantity < self.quantity
