from django.db import models
from django.core.validators import MinValueValidator
from decimal import Decimal

class Project(models.Model):
    name = models.CharField(max_length=200)
    description = models.TextField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.name

class Worker(models.Model):
    name = models.CharField(max_length=200)
    id_no = models.CharField(max_length=50, unique=True, verbose_name="ID Number")
    phone_no = models.CharField(max_length=20, verbose_name="Phone Number")
    monthly_salary = models.DecimalField(max_digits=10, decimal_places=2, validators=[MinValueValidator(Decimal('0.00'))])
    created_at = models.DateTimeField(auto_now_add=True)

    @property
    def day_rate(self):
        return self.monthly_salary / Decimal('20.0')

    def __str__(self):
        return self.name

class Team(models.Model):
    name = models.CharField(max_length=200)
    workers = models.ManyToManyField(Worker, related_name='teams')
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.name

class WorkLog(models.Model):
    date = models.DateField()
    project = models.ForeignKey(Project, on_delete=models.CASCADE, related_name='logs')
    workers = models.ManyToManyField(Worker, related_name='work_logs')
    notes = models.TextField(blank=True)

    def __str__(self):
        return f"{self.date} - {self.project.name}"