"""TuyaDevice model – represents a single Tuya / Smart Life sub-device
belonging to a Tuya Cloud Gateway board.

Each board (gateway) has many TuyaDevice rows, one per cloud device.
Controllable "channels" are boolean switch Data-Points (DPs) identified
by dp_code strings like "switch", "switch_1", "switch_2", …
"""
import json
from datetime import datetime
from app import db


class TuyaDevice(db.Model):
    __tablename__ = "tuya_devices"

    id          = db.Column(db.Integer, primary_key=True)
    board_id    = db.Column(db.Integer, db.ForeignKey("boards.id"), nullable=False)

    # Tuya global device ID (e.g. "bf0123456789abc")
    device_id   = db.Column(db.String(64), nullable=False)
    # User-visible name
    name        = db.Column(db.String(128), default="")
    # Tuya product category code (e.g. "kg"=switch, "dj"=light)
    category    = db.Column(db.String(32), default="")
    # Full product name from Tuya cloud
    product_name = db.Column(db.String(128), default="")
    # Derived kind label: switch / light / fan / sensor / cover
    kind        = db.Column(db.String(32), default="switch")
    # Bootstrap icon class for this kind
    kind_icon_cls = db.Column(db.String(64), default="bi-toggles")
    # Number of controllable switch channels
    num_channels = db.Column(db.Integer, default=1)
    # JSON list of switch DP codes in channel order, e.g. ["switch_1","switch_2"]
    switch_dps_json = db.Column(db.Text, default='["switch"]')
    # Full device status as JSON dict, e.g. {"switch":true,"countdown":0}
    status_json = db.Column(db.Text, default="{}")
    # Whether device is currently online
    is_online   = db.Column(db.Boolean, default=False)
    last_seen   = db.Column(db.DateTime, nullable=True)

    board = db.relationship("Board", back_populates="tuya_devices")

    # ── status helpers ────────────────────────────────────────────────────────

    @property
    def status(self) -> dict:
        try:
            return json.loads(self.status_json or "{}")
        except (ValueError, TypeError):
            return {}

    @status.setter
    def status(self, value: dict):
        self.status_json = json.dumps(value)

    # ── switch-DP helpers ─────────────────────────────────────────────────────

    @property
    def switch_dps(self) -> list[str]:
        """Ordered list of switch DP codes, e.g. ['switch_1', 'switch_2']."""
        try:
            v = json.loads(self.switch_dps_json or '["switch"]')
            return v if v else ["switch"]
        except (ValueError, TypeError):
            return ["switch"]

    def get_channel_state(self, idx: int) -> bool:
        """Return the on/off state of the switch channel at *idx*."""
        dps = self.switch_dps
        if not dps:
            return False
        dp_code = dps[idx] if idx < len(dps) else dps[0]
        return bool(self.status.get(dp_code, False))

    def dp_for_channel(self, idx: int) -> str:
        """Return the dp_code for channel at *idx*."""
        dps = self.switch_dps
        return dps[idx] if dps and idx < len(dps) else dps[0] if dps else "switch"