# apps/skills/models.py

import uuid
from django.db import models


class SkillTree(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    slug = models.SlugField(max_length=80, unique=True)
    name = models.CharField(max_length=120)
    description = models.TextField(blank=True)
    icon = models.CharField(max_length=80, blank=True)
    color = models.CharField(max_length=7, blank=True)
    is_active = models.BooleanField(default=True)
    sort_order = models.PositiveIntegerField(default=0)

    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)


class Skill(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    tree = models.ForeignKey(
        SkillTree,
        on_delete=models.CASCADE,
        related_name="skills",
    )
    slug = models.SlugField(max_length=80)
    name = models.CharField(max_length=120)
    description = models.TextField(blank=True)
    icon = models.CharField(max_length=80, blank=True)

    # Utilisable pour afficher le graphe
    position_x = models.IntegerField(default=0)
    position_y = models.IntegerField(default=0)
    sort_order = models.PositiveIntegerField(default=0)

    is_active = models.BooleanField(default=True)
    prerequisites = models.ManyToManyField(
        "self",
        symmetrical=False,
        blank=True,
        related_name="unlocks",
    )

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=("tree", "slug"),
                name="unique_skill_slug_per_tree",
            )
        ]

class Task(models.Model):
    class ValidationMode(models.TextChoices):
        SELF = "self", "Auto-validation"
        PEER = "peer", "Validation par un tiers"
        PROOF = "proof", "Preuve demandée"

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    slug = models.SlugField(max_length=100, unique=True)
    name = models.CharField(max_length=160)
    description = models.TextField(blank=True)

    base_xp = models.PositiveIntegerField()
    validation_mode = models.CharField(
        max_length=16,
        choices=ValidationMode.choices,
        default=ValidationMode.SELF,
    )

    cooldown_seconds = models.PositiveIntegerField(default=0)
    daily_limit = models.PositiveIntegerField(null=True, blank=True)
    is_repeatable = models.BooleanField(default=True)
    is_active = models.BooleanField(default=True)

    skills = models.ManyToManyField(
        Skill,
        through="TaskSkillReward",
        related_name="tasks",
    )

    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)


class TaskSkillReward(models.Model):
    task = models.ForeignKey(Task, on_delete=models.CASCADE)
    skill = models.ForeignKey(Skill, on_delete=models.CASCADE)

    # Permet, par exemple, de répartir 10 XP entre maison et écologie.
    xp = models.PositiveIntegerField()

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