# apps/progression/models.py

import uuid

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


class TaskCompletion(models.Model):
    class Status(models.TextChoices):
        PENDING = "pending", "En attente"
        ACCEPTED = "accepted", "Acceptée"
        REJECTED = "rejected", "Refusée"
        CANCELLED = "cancelled", "Annulée"

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    player = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name="task_completions",
    )
    task = models.ForeignKey(
        "skills.Task",
        on_delete=models.PROTECT,
        related_name="completions",
    )

    status = models.CharField(
        max_length=16,
        choices=Status.choices,
        default=Status.ACCEPTED,
    )

    completed_at = models.DateTimeField()
    submitted_at = models.DateTimeField(auto_now_add=True)

    note = models.TextField(blank=True)
    proof_url = models.URLField(blank=True)

    # Évite les doubles créations lors d’un retry de l’API.
    idempotency_key = models.CharField(
        max_length=100,
        null=True,
        blank=True,
    )

    # Snapshot au moment de la validation
    task_name_snapshot = models.CharField(max_length=160)
    xp_snapshot = models.PositiveIntegerField(default=0)

    validated_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="validated_completions",
    )
    validated_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=("player", "idempotency_key"),
                condition=models.Q(idempotency_key__isnull=False),
                name="unique_player_idempotency_key",
            )
        ]
        indexes = [
            models.Index(fields=("player", "-completed_at")),
            models.Index(fields=("task", "-completed_at")),
        ]

class XPTransaction(models.Model):
    class Reason(models.TextChoices):
        TASK = "task", "Réalisation d’une tâche"
        ACHIEVEMENT = "achievement", "Succès"
        BONUS = "bonus", "Bonus"
        CORRECTION = "correction", "Correction"
        REVERSAL = "reversal", "Annulation"

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    player = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name="xp_transactions",
    )
    skill = models.ForeignKey(
        "skills.Skill",
        on_delete=models.PROTECT,
        related_name="xp_transactions",
    )

    # Signé : positif ou négatif
    amount = models.IntegerField()
    reason = models.CharField(max_length=20, choices=Reason.choices)

    completion = models.ForeignKey(
        TaskCompletion,
        null=True,
        blank=True,
        on_delete=models.PROTECT,
        related_name="xp_transactions",
    )
    reversed_transaction = models.OneToOneField(
        "self",
        null=True,
        blank=True,
        on_delete=models.PROTECT,
        related_name="reversal",
    )

    metadata = models.JSONField(default=dict, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        indexes = [
            models.Index(fields=("player", "skill")),
            models.Index(fields=("player", "-created_at")),
        ]

class PlayerSkillProgress(models.Model):
    player = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name="skill_progress",
    )
    skill = models.ForeignKey(
        "skills.Skill",
        on_delete=models.CASCADE,
        related_name="player_progress",
    )
    xp = models.PositiveBigIntegerField(default=0)
    level = models.PositiveIntegerField(default=0)
    unlocked_at = models.DateTimeField(null=True, blank=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=("player", "skill"),
                name="unique_player_skill_progress",
            )
        ]