from django.conf import settings
from django.db import models


class Project(models.Model):
    class Status(models.TextChoices):
        PLANNED = "planned", "Планируется"
        ACTIVE = "active", "В работе"
        PAUSED = "paused", "Приостановлен"
        COMPLETED = "completed", "Завершён"
        ARCHIVED = "archived", "Архив"

    name = models.CharField("Название", max_length=255)
    description = models.TextField("Цель и описание", blank=True)
    customer = models.CharField("Заказчик", max_length=255, blank=True)
    manager = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.PROTECT,
        related_name="managed_projects",
    )
    status = models.CharField(
        max_length=16, choices=Status.choices, default=Status.PLANNED
    )
    starts_on = models.DateField(null=True, blank=True)
    ends_on = models.DateField(null=True, blank=True)
    created_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.PROTECT,
        related_name="created_projects",
    )
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["name", "pk"]
        verbose_name = "Локальный проект"
        verbose_name_plural = "Локальные проекты"
        constraints = [
            models.CheckConstraint(
                condition=models.Q(ends_on__isnull=True)
                | models.Q(starts_on__isnull=True)
                | models.Q(ends_on__gte=models.F("starts_on")),
                name="project_dates_order",
            )
        ]

    def __str__(self):
        return self.name


class ProjectEvent(models.Model):
    project = models.ForeignKey(
        Project, on_delete=models.PROTECT, related_name="events"
    )
    actor = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.PROTECT)
    action = models.CharField(max_length=100)
    details = models.JSONField(default=dict)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        ordering = ["-created_at", "-id"]


class ProjectResource(models.Model):
    project = models.ForeignKey(
        Project, on_delete=models.CASCADE, related_name="resources"
    )
    title = models.CharField(max_length=255)
    kind = models.CharField(
        max_length=16,
        choices=[
            ("task", "Задача"),
            ("procurement", "Закупка"),
            ("document", "Документ"),
        ],
    )
    url = models.CharField(max_length=1000)
    created_at = models.DateTimeField(auto_now_add=True)


class ProjectBoardLink(models.Model):
    project = models.ForeignKey(
        Project, on_delete=models.CASCADE, related_name="board_links"
    )
    board = models.ForeignKey(
        "tasks.TaskBoard", on_delete=models.CASCADE, related_name="project_links"
    )
    created_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.PROTECT,
        related_name="created_project_board_links",
    )
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        ordering = ["board__name", "board_id"]
        constraints = [
            models.UniqueConstraint(
                fields=["project", "board"], name="project_board_link_unique"
            )
        ]