from django.contrib.gis.db import models as gis_models
from django.db import models


class OfficialKyosaiField(models.Model):
    k_num = models.CharField(max_length=20, unique=True, verbose_name="共済番号")
    s_num = models.CharField(max_length=20, blank=True, null=True, verbose_name="枝番")
    address = models.CharField(max_length=255, verbose_name="住所")
    kanji_name = models.CharField(max_length=100, verbose_name="漢字名")
    area = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="面積(ha)")

    class Meta:
        verbose_name = "共済マスタ"
        verbose_name_plural = "共済マスタ"

    def __str__(self):
        return f"{self.k_num} ({self.kanji_name})"


class OfficialChusankanField(models.Model):
    c_id = models.CharField(max_length=20, unique=True, verbose_name="中山間ID")
    oaza = models.CharField(max_length=100, verbose_name="大字")
    aza = models.CharField(max_length=100, verbose_name="字")
    chiban = models.CharField(max_length=50, verbose_name="地番")
    area = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="面積(ha)")
    payment_amount = models.DecimalField(max_digits=12, decimal_places=0, blank=True, null=True, verbose_name="支払金額")

    class Meta:
        verbose_name = "中山間マスタ"
        verbose_name_plural = "中山間マスタ"

    def __str__(self):
        return f"{self.c_id} ({self.oaza}{self.aza})"


class Field(models.Model):
    name = models.CharField(max_length=100, verbose_name="圃場名")
    address = models.CharField(max_length=255, verbose_name="住所")
    area_tan = models.DecimalField(max_digits=6, decimal_places=4, verbose_name="面積(反)")
    area_m2 = models.IntegerField(verbose_name="面積(m2)")
    owner_name = models.CharField(max_length=100, verbose_name="所有者名")
    kyosai_field = models.ForeignKey(
        OfficialKyosaiField,
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name='fields',
        verbose_name="関連共済マスタ"
    )
    chusankan_field = models.ForeignKey(
        OfficialChusankanField,
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name='fields',
        verbose_name="関連中山間マスタ"
    )
    location = gis_models.PointField(blank=True, null=True, verbose_name="位置情報")

    class Meta:
        verbose_name = "圃場"
        verbose_name_plural = "圃場"

    def __str__(self):
        return self.name