"""Owner settings: services CRUD, per-resource opening hours/notice/buffer,
auto_confirm, and notify_channel (#21).

All routes are session-authenticated via owner_auth.login_required and read
client_id from the session only (never a request param), so every write goes
through booking_db.py's own tenant-scoped UPDATE ... WHERE client_id = ...
guard on top of that. Because booking_api.py's slot generation and booking
creation always re-read resources/services/clients fresh on every request
(#16, #18), a settings change here is live for the public booking page and
availability engine on the very next request -- no cache to invalidate.
"""
from datetime import time

from flask import Blueprint, redirect, render_template, request, session, url_for

import booking_db as bdb
from owner_auth import login_required

bp = Blueprint("owner_settings", __name__, url_prefix="/owner/settings")

WEEKDAYS = [0, 1, 2, 3, 4, 5, 6]  # 0=Monday..6=Sunday, matching resource_hours


def _redirect(error=None):
    return redirect(url_for("owner_settings.settings", error=error))


def _parse_int(value):
    try:
        return int(value)
    except (TypeError, ValueError):
        return None


def _parse_price(value):
    value = (value or "").strip()
    if not value:
        return None
    try:
        return float(value)
    except ValueError:
        return None


def _parse_time(value):
    value = (value or "").strip()
    if not value:
        return None
    try:
        return time.fromisoformat(value)
    except ValueError:
        return None


@bp.get("")
@login_required
def settings():
    client_id = session["client_id"]
    client = bdb.get_client(client_id)
    resources = bdb.list_resources(client_id)
    hours_by_resource = {
        r["resource_id"]: bdb.get_resource_hours(client_id, r["resource_id"])
        for r in resources}
    ics_token = bdb.ensure_ics_token(client_id)
    return render_template(
        "owner/settings.html", client=client, services=bdb.list_services(client_id),
        resources=resources, hours_by_resource=hours_by_resource, weekdays=WEEKDAYS,
        ics_url=url_for("bookings_ics", token=ics_token, _external=True),
        error=request.args.get("error"))


@bp.post("/services")
@login_required
def create_service():
    client_id = session["client_id"]
    name = (request.form.get("name") or "").strip()
    duration_minutes = _parse_int(request.form.get("duration_minutes"))
    price = _parse_price(request.form.get("price"))
    if not name or not duration_minutes or duration_minutes <= 0:
        return _redirect(error="invalid_service")
    bdb.create_service(client_id, name, duration_minutes, price=price)
    return _redirect()


@bp.post("/services/<service_id>")
@login_required
def update_service(service_id):
    client_id = session["client_id"]
    name = (request.form.get("name") or "").strip()
    duration_minutes = _parse_int(request.form.get("duration_minutes"))
    price = _parse_price(request.form.get("price"))
    active = request.form.get("active") == "on"
    if not name or not duration_minutes or duration_minutes <= 0:
        return _redirect(error="invalid_service")
    row = bdb.update_service(
        client_id, service_id, name=name, duration_minutes=duration_minutes,
        price=price, active=active)
    if row is None:
        return _redirect(error="not_found")
    return _redirect()


@bp.post("/resources/<resource_id>")
@login_required
def update_resource(resource_id):
    client_id = session["client_id"]
    min_notice_minutes = _parse_int(request.form.get("min_notice_minutes"))
    max_advance_days = _parse_int(request.form.get("max_advance_days"))
    buffer_minutes = _parse_int(request.form.get("buffer_minutes"))
    if min_notice_minutes is None or min_notice_minutes < 0:
        return _redirect(error="invalid_resource")
    if max_advance_days is None or max_advance_days < 0:
        return _redirect(error="invalid_resource")
    if buffer_minutes is None or buffer_minutes < 0:
        return _redirect(error="invalid_resource")
    row = bdb.update_resource(
        client_id, resource_id, min_notice_minutes=min_notice_minutes,
        max_advance_days=max_advance_days, buffer_minutes=buffer_minutes)
    if row is None:
        return _redirect(error="not_found")
    return _redirect()


@bp.post("/resources/<resource_id>/hours")
@login_required
def update_resource_hours(resource_id):
    client_id = session["client_id"]
    if bdb.get_resource(client_id, resource_id) is None:
        return _redirect(error="not_found")

    # Parse and validate every weekday up front so a bad entry later in the
    # form (e.g. Wednesday) can't leave earlier weekdays (Monday, Tuesday)
    # already written -- either the whole week's hours update or none of it
    # does, matching update_resource/update_client's all-or-nothing shape.
    parsed = {}
    for weekday in WEEKDAYS:
        if request.form.get(f"closed_{weekday}") == "on":
            parsed[weekday] = None
            continue
        opens_at = _parse_time(request.form.get(f"opens_at_{weekday}"))
        closes_at = _parse_time(request.form.get(f"closes_at_{weekday}"))
        if opens_at is None or closes_at is None or closes_at <= opens_at:
            return _redirect(error="invalid_hours")
        parsed[weekday] = (opens_at, closes_at)

    for weekday, hours in parsed.items():
        if hours is None:
            bdb.set_resource_hours(client_id, resource_id, weekday, None, None)
        else:
            bdb.set_resource_hours(client_id, resource_id, weekday, *hours)
    return _redirect()


@bp.post("/client")
@login_required
def update_client():
    client_id = session["client_id"]
    auto_confirm = request.form.get("auto_confirm") == "on"
    notify_channel = (request.form.get("notify_channel") or "").strip() or None
    if notify_channel is not None and notify_channel != "telegram":
        return _redirect(error="invalid_notify_channel")
    bdb.update_client(client_id, auto_confirm=auto_confirm, notify_channel=notify_channel)
    return _redirect()