"""
Organizations models - Hospital, Department, Physician, Employee, Patient
"""
from django.db import models

from apps.core.models import TimeStampedModel, UUIDModel, StatusChoices


class Hospital(UUIDModel, TimeStampedModel):
    """Hospital/Facility model"""
    name = models.CharField(max_length=200)
    name_ar = models.CharField(max_length=200, blank=True, verbose_name="Name (Arabic)")
    code = models.CharField(max_length=50, unique=True, db_index=True)
    
    # Contact information
    address = models.TextField(blank=True)
    city = models.CharField(max_length=100, blank=True)
    phone = models.CharField(max_length=20, blank=True)
    email = models.EmailField(blank=True)
    
    # Status
    status = models.CharField(
        max_length=20,
        choices=StatusChoices.choices,
        default=StatusChoices.ACTIVE,
        db_index=True
    )
    
    # Metadata
    license_number = models.CharField(max_length=100, blank=True)
    capacity = models.IntegerField(null=True, blank=True, help_text="Bed capacity")
    
    class Meta:
        ordering = ['name']
        verbose_name_plural = 'Hospitals'
    
    def __str__(self):
        return self.name


class Department(UUIDModel, TimeStampedModel):
    """Department within a hospital"""
    hospital = models.ForeignKey(Hospital, on_delete=models.CASCADE, related_name='departments')
    
    name = models.CharField(max_length=200)
    name_ar = models.CharField(max_length=200, blank=True, verbose_name="Name (Arabic)")
    code = models.CharField(max_length=50, db_index=True)
    
    # Hierarchy
    parent = models.ForeignKey(
        'self',
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='sub_departments'
    )
    
    # Manager
    manager = models.ForeignKey(
        'accounts.User',
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='managed_departments'
    )
    
    # Contact
    phone = models.CharField(max_length=20, blank=True)
    email = models.EmailField(blank=True)
    location = models.CharField(max_length=200, blank=True, help_text="Building/Floor/Room")
    
    # Status
    status = models.CharField(
        max_length=20,
        choices=StatusChoices.choices,
        default=StatusChoices.ACTIVE,
        db_index=True
    )
    
    class Meta:
        ordering = ['hospital', 'name']
        unique_together = [['hospital', 'code']]
    
    def __str__(self):
        return f"{self.hospital.name} - {self.name}"


class Physician(UUIDModel, TimeStampedModel):
    """Physician/Doctor model"""
    # Link to user account (optional - some physicians may not have system access)
    user = models.OneToOneField(
        'accounts.User',
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='physician_profile'
    )
    
    # Basic information
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)
    first_name_ar = models.CharField(max_length=100, blank=True)
    last_name_ar = models.CharField(max_length=100, blank=True)
    
    # Professional information
    license_number = models.CharField(max_length=100, unique=True, db_index=True)
    specialization = models.CharField(max_length=200)
    
    # Organization
    hospital = models.ForeignKey(Hospital, on_delete=models.CASCADE, related_name='physicians')
    department = models.ForeignKey(
        Department,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='physicians'
    )
    
    # Contact
    phone = models.CharField(max_length=20, blank=True)
    email = models.EmailField(blank=True)
    
    # Status
    status = models.CharField(
        max_length=20,
        choices=StatusChoices.choices,
        default=StatusChoices.ACTIVE,
        db_index=True
    )
    
    class Meta:
        ordering = ['last_name', 'first_name']
    
    def __str__(self):
        return f"Dr. {self.first_name} {self.last_name}"
    
    def get_full_name(self):
        return f"{self.first_name} {self.last_name}"


class Employee(UUIDModel, TimeStampedModel):
    """Employee model (non-physician staff)"""
    user = models.OneToOneField(
        'accounts.User',
        on_delete=models.CASCADE,
        related_name='employee_profile'
    )
    
    # Organization
    hospital = models.ForeignKey(Hospital, on_delete=models.CASCADE, related_name='employees')
    department = models.ForeignKey(
        Department,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='employees'
    )
    
    # Job information
    employee_id = models.CharField(max_length=50, unique=True, db_index=True)
    job_title = models.CharField(max_length=200)
    hire_date = models.DateField(null=True, blank=True)
    
    # Status
    status = models.CharField(
        max_length=20,
        choices=StatusChoices.choices,
        default=StatusChoices.ACTIVE,
        db_index=True
    )
    
    class Meta:
        ordering = ['user__last_name', 'user__first_name']
    
    def __str__(self):
        return f"{self.user.get_full_name()} - {self.job_title}"


class Patient(UUIDModel, TimeStampedModel):
    """Patient model"""
    # Basic information
    mrn = models.CharField(max_length=50, unique=True, db_index=True, verbose_name="Medical Record Number")
    national_id = models.CharField(max_length=50, blank=True, db_index=True)
    
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)
    first_name_ar = models.CharField(max_length=100, blank=True)
    last_name_ar = models.CharField(max_length=100, blank=True)
    
    # Demographics
    date_of_birth = models.DateField(null=True, blank=True)
    gender = models.CharField(
        max_length=10,
        choices=[('male', 'Male'), ('female', 'Female'), ('other', 'Other')],
        blank=True
    )
    
    # Contact
    phone = models.CharField(max_length=20, blank=True)
    email = models.EmailField(blank=True)
    address = models.TextField(blank=True)
    city = models.CharField(max_length=100, blank=True)
    
    # Primary hospital
    primary_hospital = models.ForeignKey(
        Hospital,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='patients'
    )
    
    # Status
    status = models.CharField(
        max_length=20,
        choices=StatusChoices.choices,
        default=StatusChoices.ACTIVE,
        db_index=True
    )
    
    class Meta:
        ordering = ['last_name', 'first_name']
    
    def __str__(self):
        return f"{self.first_name} {self.last_name} (MRN: {self.mrn})"
    
    def get_full_name(self):
        return f"{self.first_name} {self.last_name}"