from django.db import models


class TimeStampedModel(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True


class Nationality(TimeStampedModel):
    name = models.CharField(max_length=120, unique=True)
    iso2_code = models.CharField(max_length=2, unique=True)
    iso3_code = models.CharField(max_length=3, unique=True, blank=True, null=True)

    class Meta:
        ordering = ["name"]
        indexes = [models.Index(fields=["name"]), models.Index(fields=["iso2_code"])]
        verbose_name_plural = "Nationalities"

    def __str__(self) -> str:
        return f"{self.name} ({self.iso2_code})"


class Position(TimeStampedModel):
    code = models.CharField(max_length=10, unique=True)
    name = models.CharField(max_length=80, unique=True)

    class Meta:
        ordering = ["code"]
        indexes = [models.Index(fields=["code"]), models.Index(fields=["name"])]

    def __str__(self) -> str:
        return f"{self.code} - {self.name}"


class Role(TimeStampedModel):
    code = models.CharField(max_length=32, unique=True)
    name = models.CharField(max_length=120, unique=True)
    description = models.TextField(blank=True)

    class Meta:
        ordering = ["name"]
        indexes = [models.Index(fields=["code"]), models.Index(fields=["name"])]

    def __str__(self) -> str:
        return self.name


class Player(TimeStampedModel):
    class DominantHand(models.TextChoices):
        RIGHT = "right", "Right"
        LEFT = "left", "Left"
        BOTH = "both", "Both"
        UNKNOWN = "unknown", "Unknown"

    first_name = models.CharField(max_length=120)
    last_name = models.CharField(max_length=120)
    full_name = models.CharField(max_length=260)
    birth_date = models.DateField(blank=True, null=True)
    nationality = models.ForeignKey(
        "players.Nationality",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="players",
    )
    nominal_position = models.ForeignKey(
        "players.Position",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="nominal_players",
    )
    inferred_role = models.ForeignKey(
        "players.Role",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="role_players",
    )
    origin_competition = models.ForeignKey(
        "competitions.Competition",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="origin_players",
    )
    origin_team = models.ForeignKey(
        "teams.Team",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="origin_players",
    )
    height_cm = models.PositiveSmallIntegerField(blank=True, null=True)
    weight_kg = models.PositiveSmallIntegerField(blank=True, null=True)
    wingspan_cm = models.PositiveSmallIntegerField(blank=True, null=True)
    dominant_hand = models.CharField(
        max_length=16,
        choices=DominantHand.choices,
        default=DominantHand.UNKNOWN,
    )
    is_active = models.BooleanField(default=True)

    class Meta:
        ordering = ["full_name", "id"]
        constraints = [
            models.UniqueConstraint(
                fields=["full_name", "birth_date"],
                name="uq_player_full_name_birth_date",
            )
        ]
        indexes = [
            models.Index(fields=["full_name"]),
            models.Index(fields=["last_name", "first_name"]),
            models.Index(fields=["birth_date"]),
            models.Index(fields=["nationality"]),
            models.Index(fields=["nominal_position"]),
            models.Index(fields=["inferred_role"]),
            models.Index(fields=["origin_competition"]),
            models.Index(fields=["origin_team"]),
            models.Index(fields=["is_active"]),
            models.Index(fields=["height_cm"]),
        ]

    def __str__(self) -> str:
        return self.full_name


class PlayerAlias(TimeStampedModel):
    player = models.ForeignKey("players.Player", on_delete=models.CASCADE, related_name="aliases")
    alias = models.CharField(max_length=260)
    source = models.CharField(max_length=80, blank=True)
    is_primary = models.BooleanField(default=False)

    class Meta:
        ordering = ["alias"]
        constraints = [
            models.UniqueConstraint(fields=["player", "alias"], name="uq_player_alias_per_player")
        ]
        indexes = [models.Index(fields=["alias"]), models.Index(fields=["source"])]

    def __str__(self) -> str:
        return f"{self.alias} ({self.player_id})"


class PlayerCareerEntry(TimeStampedModel):
    player = models.ForeignKey(
        "players.Player",
        on_delete=models.CASCADE,
        related_name="career_entries",
    )
    team = models.ForeignKey(
        "teams.Team",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="career_entries",
    )
    competition = models.ForeignKey(
        "competitions.Competition",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="career_entries",
    )
    season = models.ForeignKey(
        "competitions.Season",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="career_entries",
    )
    role_snapshot = models.ForeignKey(
        "players.Role",
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        related_name="career_entries",
    )
    shirt_number = models.PositiveSmallIntegerField(blank=True, null=True)
    start_date = models.DateField(blank=True, null=True)
    end_date = models.DateField(blank=True, null=True)
    notes = models.TextField(blank=True)

    class Meta:
        ordering = ["player", "-start_date", "-id"]
        constraints = [
            models.UniqueConstraint(
                fields=["player", "team", "competition", "season", "start_date"],
                name="uq_player_career_entry_scope",
            ),
            models.CheckConstraint(
                condition=models.Q(end_date__isnull=True)
                | models.Q(start_date__isnull=True)
                | models.Q(end_date__gte=models.F("start_date")),
                name="ck_career_entry_dates",
            ),
        ]
        indexes = [
            models.Index(fields=["player", "start_date"]),
            models.Index(fields=["team", "season"]),
            models.Index(fields=["competition", "season"]),
        ]

    def __str__(self) -> str:
        return f"{self.player} | {self.team or '-'} | {self.season or '-'}"