from __future__ import annotations

from django.db import models
from django.utils import timezone

# Import domain models with light coupling
from orgs.models import Organization
from recycle_core.models import Customer, PickupOrder, Material


class TimestampedModel(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True


class Invoice(TimestampedModel):
    STATUS_DRAFT = "draft"
    STATUS_ISSUED = "issued"
    STATUS_PAID = "paid"
    STATUS_VOID = "void"
    STATUS_CHOICES = (
        (STATUS_DRAFT, "Draft"),
        (STATUS_ISSUED, "Issued"),
        (STATUS_PAID, "Paid"),
        (STATUS_VOID, "Void"),
    )

    organization = models.ForeignKey(Organization, on_delete=models.CASCADE, related_name="invoices")
    customer = models.ForeignKey(Customer, on_delete=models.PROTECT, related_name="invoices")
    pickup = models.ForeignKey(PickupOrder, on_delete=models.SET_NULL, null=True, blank=True, related_name="invoices")
    currency_code = models.CharField(max_length=8, default="USD")
    total_amount = models.DecimalField(max_digits=14, decimal_places=2, default=0)
    status = models.CharField(max_length=8, choices=STATUS_CHOICES, default=STATUS_DRAFT, db_index=True)
    issued_at = models.DateTimeField(null=True, blank=True)
    due_at = models.DateTimeField(null=True, blank=True)



class InvoiceLine(TimestampedModel):
    invoice = models.ForeignKey(Invoice, on_delete=models.CASCADE, related_name="lines")
    description = models.CharField(max_length=255)
    material = models.ForeignKey(Material, on_delete=models.SET_NULL, null=True, blank=True)
    quantity = models.DecimalField(max_digits=12, decimal_places=3)
    unit = models.CharField(max_length=8, choices=Material.UNIT_CHOICES, default=Material.UNIT_KG)
    unit_price = models.DecimalField(max_digits=12, decimal_places=2)
    line_total = models.DecimalField(max_digits=14, decimal_places=2)



class Payment(TimestampedModel):
    invoice = models.ForeignKey(Invoice, on_delete=models.CASCADE, related_name="payments")
    amount = models.DecimalField(max_digits=14, decimal_places=2)
    currency_code = models.CharField(max_length=8, default="USD")
    received_at = models.DateTimeField(default=timezone.now)
    reference = models.CharField(max_length=128, blank=True)



class Payout(TimestampedModel):
    organization = models.ForeignKey(Organization, on_delete=models.CASCADE, related_name="payouts")
    customer = models.ForeignKey(Customer, on_delete=models.PROTECT, related_name="payouts")
    pickup = models.ForeignKey(PickupOrder, on_delete=models.SET_NULL, null=True, blank=True, related_name="payouts")
    amount = models.DecimalField(max_digits=14, decimal_places=2)
    currency_code = models.CharField(max_length=8, default="USD")
    paid_at = models.DateTimeField(default=timezone.now)
    reference = models.CharField(max_length=128, blank=True)