import uuid
from django.db import models


SENDER_RULE_CHOICES = [
    ('always_notify', '常に通知'),
    ('never_notify', '通知しない'),
]


class MailSender(models.Model):
    """送信者ルール"""
    email = models.EmailField(null=True, blank=True, verbose_name="メールアドレス")
    domain = models.CharField(max_length=255, null=True, blank=True, verbose_name="ドメイン")
    rule = models.CharField(
        max_length=20,
        choices=SENDER_RULE_CHOICES,
        default='never_notify',
        verbose_name="ルール"
    )
    note = models.TextField(blank=True, verbose_name="メモ")
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        verbose_name = "送信者ルール"
        verbose_name_plural = "送信者ルール"
        constraints = [
            models.CheckConstraint(
                check=(
                    models.Q(email__isnull=False, domain__isnull=True) |
                    models.Q(email__isnull=True, domain__isnull=False)
                ),
                name='mail_sender_email_or_domain'
            )
        ]

    def __str__(self):
        value = self.email or self.domain
        kind = "アドレス" if self.email else "ドメイン"
        return f"[{kind}] {value}"


ACCOUNT_CHOICES = [
    ('gmail', 'Gmail'),
    ('gmail_service', 'Gmail (サービス用)'),
    ('hotmail', 'Hotmail'),
    ('xserver1', 'Xserver (akira@keinafarm.com)'),
    ('xserver2', 'Xserver (service@keinafarm.com)'),
    ('xserver3', 'Xserver (midori@keinafarm.com)'),
    ('xserver4', 'Xserver (kouseiren@keinafarm.com)'),
    ('xserver5', 'Xserver (post@keinafarm.com)'),
    ('xserver6', 'Xserver (sales@keinafarm.com)'),
    ('xserver', 'Xserver (legacy)'),
]

FEEDBACK_CHOICES = [
    ('important', '重要だった'),
    ('not_important', '普通のメール'),
    ('never_notify', '今後通知しない'),
    ('always_notify', '常に通知してほしい'),
]


class MailEmail(models.Model):
    """受信メール記録（LLMに渡したメール）"""
    account = models.CharField(max_length=20, choices=ACCOUNT_CHOICES, verbose_name="アカウント")
    message_id = models.CharField(max_length=500, unique=True, verbose_name="Message-ID")
    sender_email = models.EmailField(verbose_name="送信者アドレス")
    sender_domain = models.CharField(max_length=255, verbose_name="送信者ドメイン")
    subject = models.CharField(max_length=500, verbose_name="件名")
    body_preview = models.TextField(verbose_name="本文冒頭")
    received_at = models.DateTimeField(verbose_name="受信日時")
    llm_verdict = models.CharField(
        max_length=20,
        choices=[('important', '重要'), ('not_important', '重要でない')],
        verbose_name="LLM判定"
    )
    notified_at = models.DateTimeField(null=True, blank=True, verbose_name="LINE通知日時")
    feedback = models.CharField(
        max_length=20,
        choices=FEEDBACK_CHOICES,
        null=True, blank=True,
        verbose_name="フィードバック"
    )
    feedback_at = models.DateTimeField(null=True, blank=True, verbose_name="フィードバック日時")

    class Meta:
        verbose_name = "受信メール"
        verbose_name_plural = "受信メール"
        ordering = ['-received_at']

    def __str__(self):
        return f"{self.subject} ({self.sender_email})"


class MailNotificationToken(models.Model):
    """LINEフィードバックURL用トークン（有効期限なし）"""
    email = models.OneToOneField(
        MailEmail,
        on_delete=models.CASCADE,
        related_name='notification_token',
        verbose_name="メール"
    )
    token = models.UUIDField(default=uuid.uuid4, unique=True, verbose_name="トークン")
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        verbose_name = "通知トークン"
        verbose_name_plural = "通知トークン"

    def __str__(self):
        return str(self.token)