"""Layout management routes."""
import json
from datetime import datetime

from flask import Blueprint, render_template, redirect, url_for, flash, request, jsonify, abort
from flask_login import login_required, current_user

from app import db
from app.models.layout import Layout
from app.models.board import Board
from app.models.sonoff_device import SonoffDevice
from app.models.tuya_device import TuyaDevice

layouts_bp = Blueprint("layouts", __name__)


# ── list ──────────────────────────────────────────────────────────────────────

@layouts_bp.route("/")
@login_required
def list_layouts():
    layouts = Layout.query.order_by(Layout.name).all()
    return render_template("layouts/list.html", layouts=layouts)


# ── create ────────────────────────────────────────────────────────────────────

@layouts_bp.route("/create", methods=["POST"])
@login_required
def create_layout():
    if not current_user.is_admin():
        abort(403)
    name = request.form.get("name", "").strip()
    description = request.form.get("description", "").strip()
    if not name:
        flash("Layout name is required.", "danger")
        return redirect(url_for("layouts.list_layouts"))
    layout = Layout(name=name, description=description or None)
    db.session.add(layout)
    db.session.commit()
    return redirect(url_for("layouts.builder", layout_id=layout.id))


# ── builder ───────────────────────────────────────────────────────────────────

@layouts_bp.route("/<int:layout_id>/builder")
@login_required
def builder(layout_id: int):
    layout = db.get_or_404(Layout, layout_id)
    boards = Board.query.order_by(Board.name).all()

    # Build a boards palette for the JS device sidebar
    boards_data = []
    for b in boards:
        bd = {"id": b.id, "name": b.name, "online": b.is_online,
              "relays": [], "inputs": [], "sonoff_channels": [],
              "tuya_channels": [],
              "board_type": b.board_type}

        # ── Standard relay/input boards ──────────────────────────────────────
        for n in range(1, b.num_relays + 1):
            e = b.get_relay_entity(n)
            bd["relays"].append({
                "num": n,
                "name": e["name"],
                "icon": e["icon"],
                "onColor": e["on_color"],
                "offColor": e["off_color"],
                "isOn": b.relay_states.get(f"relay_{n}", False),
            })
        for n in range(1, b.num_inputs + 1):
            e = b.get_input_entity(n)
            bd["inputs"].append({
                "num": n,
                "name": e["name"],
                "icon": e["icon"],
                "activeColor": e["active_color"],
                "idleColor": e["idle_color"],
                "rawState": b.input_states.get(f"input_{n}", True),
            })

        # ── Sonoff eWeLink sub-devices ────────────────────────────────────────
        if b.board_type == "sonoff_ewelink":
            KIND_ICON = {
                "switch": "bi-toggles",
                "light":  "bi-lightbulb-fill",
                "fan":    "bi-fan",
                "sensor": "bi-thermometer-half",
                "remote": "bi-broadcast",
            }
            devices = SonoffDevice.query.filter_by(board_id=b.id).order_by(
                SonoffDevice.name).all()
            for dev in devices:
                icon = KIND_ICON.get(dev.kind, "bi-toggles")
                num_ch = max(dev.num_channels, 1)
                for ch in range(num_ch):
                    label = dev.name if num_ch == 1 else f"{dev.name} – Ch{ch + 1}"
                    bd["sonoff_channels"].append({
                        "deviceId":   dev.device_id,
                        "deviceDbId": dev.id,
                        "channel":    ch,
                        "name":       label,
                        "icon":       icon,
                        "kind":       dev.kind,
                        "isOn":       dev.get_channel_state(ch),
                        "isOnline":   dev.is_online,
                    })

        # ── Tuya Cloud sub-devices ────────────────────────────────────────────
        if b.board_type == "tuya_cloud":
            TUYA_KIND_ICON = {
                "switch": "bi-toggles",
                "light":  "bi-lightbulb-fill",
                "fan":    "bi-fan",
                "sensor": "bi-thermometer-half",
                "cover":  "bi-door-open",
            }
            tuya_devs = TuyaDevice.query.filter_by(board_id=b.id).order_by(
                TuyaDevice.name).all()
            for dev in tuya_devs:
                icon = TUYA_KIND_ICON.get(dev.kind, "bi-plug")
                for dp in dev.switch_dps:
                    idx   = dev.switch_dps.index(dp)
                    label = (dev.name if dev.num_channels == 1
                             else f"{dev.name} – Ch{idx + 1}")
                    bd["tuya_channels"].append({
                        "deviceId": dev.device_id,
                        "channel":  dp,        # dp_code string, e.g. "switch_1"
                        "name":     label,
                        "icon":     icon,
                        "kind":     dev.kind,
                        "isOn":     dev.status.get(dp, False),
                        "isOnline": dev.is_online,
                    })

        boards_data.append(bd)

    return render_template(
        "layouts/builder.html",
        layout=layout,
        boards_data=boards_data,
    )


# ── save (AJAX) ───────────────────────────────────────────────────────────────

@layouts_bp.route("/<int:layout_id>/save", methods=["POST"])
@login_required
def save_layout(layout_id: int):
    layout = db.get_or_404(Layout, layout_id)
    data = request.get_json(silent=True) or {}
    if "canvas" in data:
        layout.canvas_json = json.dumps(data["canvas"])
    if data.get("thumbnail"):
        layout.thumbnail_b64 = data["thumbnail"]
    layout.updated_at = datetime.utcnow()
    db.session.commit()
    return jsonify({"status": "ok"})


# ── delete ────────────────────────────────────────────────────────────────────

@layouts_bp.route("/<int:layout_id>/delete", methods=["POST"])
@login_required
def delete_layout(layout_id: int):
    if not current_user.is_admin():
        abort(403)
    layout = db.get_or_404(Layout, layout_id)
    db.session.delete(layout)
    db.session.commit()
    flash(f"Layout '{layout.name}' deleted.", "warning")
    return redirect(url_for("layouts.list_layouts"))