from odoo import models, fields

MODULE_SELECTION = [
    ("reading", "Reading"),
    ("listening", "Listening"),
    ("writing", "Writing"),
    ("speaking", "Speaking"),
    ("level", "Level"),
]

VARIANT_SELECTION = [
    ("full", "Full"),
    ("partial", "Partial"),
]

ACCESS_SELECTION = [
    ("public", "Public"),
    ("private", "Private"),
    ("entity", "Entity"),
]


class EncoachExam(models.Model):
    _name = "encoach.exam"
    _description = "EnCoach Exam"

    module = fields.Selection(MODULE_SELECTION, required=True, index=True)
    min_timer = fields.Integer(string="Minimum Timer (minutes)", default=0)
    is_diagnostic = fields.Boolean(default=False)
    variant = fields.Selection(VARIANT_SELECTION)
    difficulty = fields.Json(help="List of CEFR difficulty levels, e.g. ['A1','B2']")
    owner_ids = fields.Many2many(
        "res.users", "encoach_exam_owner_rel", "exam_id", "user_id",
        string="Owners",
    )
    entity_ids = fields.Many2many(
        "encoach.entity", "encoach_exam_entity_rel", "exam_id", "entity_id",
        string="Entities",
    )
    shuffle = fields.Boolean(default=False)
    access = fields.Selection(ACCESS_SELECTION, default="public", required=True)
    label = fields.Char()
    requires_approval = fields.Boolean(default=False)
    approved = fields.Boolean(default=False)
    parts = fields.Json(help="Nested exam structure (parts, exercises, questions)")
    legacy_id = fields.Char(index=True)

    def action_approve(self):
        """Set exam as approved (used by form view Approve button)."""
        self.write({"approved": True})

    def to_encoach_dict(self):
        self.ensure_one()
        difficulty = self.difficulty or []
        if isinstance(difficulty, str):
            import json
            difficulty = json.loads(difficulty)
        return {
            "id": self.id,
            "module": self.module,
            "minTimer": self.min_timer,
            "isDiagnostic": self.is_diagnostic,
            "variant": self.variant,
            "difficulty": difficulty,
            "owners": self.owner_ids.ids,
            "entities": [str(eid) for eid in self.entity_ids.ids],
            "shuffle": self.shuffle,
            "access": self.access,
            "label": self.label or "",
            "requiresApproval": self.requires_approval,
            "approved": self.approved,
            "parts": self.parts or [],
            "createdBy": self.create_uid.id if self.create_uid else None,
            "createdAt": (
                self.create_date.isoformat() if self.create_date else None
            ),
        }