"""
app/admin/plans/routes.py
Subscription plan management: create, edit, toggle active.
Feature flags stored as JSON. All changes logged.
"""

import logging
from flask import Blueprint, render_template, redirect, url_for, flash, request
from flask_login import login_required

from app.extensions import db
from app.models.platform import Plan
from app.admin.utils import superadmin_required, log_admin_action, model_to_dict

logger = logging.getLogger(__name__)

plans_bp = Blueprint("plans", __name__, url_prefix="/plans")

_AUDIT_FIELDS = ["name", "price_monthly", "max_staff", "max_locations", "features_json", "is_active"]

# All known feature flags — used to build the form checkboxes
ALL_FEATURES = [
    "pos", "appointments", "customers", "services", "promotions",
    "appointment_reminders", "customer_reviews", "reconciliation",
    "basic_reports", "inventory", "commission", "full_reports",
    "multi_location", "online_booking", "waitlist", "marketing",
]


@plans_bp.route("/")
@login_required
@superadmin_required
def index():
    all_plans = Plan.query.order_by(Plan.price_monthly.asc()).all()
    return render_template("admin/plans/index.html", plans=all_plans)


@plans_bp.route("/new", methods=["GET", "POST"])
@login_required
@superadmin_required
def create():
    if request.method == "POST":
        plan, error = _plan_from_form(None)
        if error:
            return render_template("admin/plans/form.html", mode="create",
                                   all_features=ALL_FEATURES, error=error)
        db.session.add(plan)
        db.session.flush()
        log_admin_action("plan.create", "plan", plan.id,
                         after=model_to_dict(plan, _AUDIT_FIELDS))
        db.session.commit()
        logger.info("Plan created: id=%s name=%s", plan.id, plan.name)
        flash(f"Plan \'{plan.name}\' created.", "success")
        return redirect(url_for("plans.index"))

    return render_template("admin/plans/form.html", mode="create", all_features=ALL_FEATURES)


@plans_bp.route("/<int:plan_id>/edit", methods=["GET", "POST"])
@login_required
@superadmin_required
def edit(plan_id):
    plan = Plan.query.get_or_404(plan_id)
    before = model_to_dict(plan, _AUDIT_FIELDS)

    if request.method == "POST":
        _, error = _plan_from_form(plan)
        if error:
            return render_template("admin/plans/form.html", mode="edit",
                                   plan=plan, all_features=ALL_FEATURES, error=error)
        log_admin_action("plan.edit", "plan", plan.id,
                         before=before, after=model_to_dict(plan, _AUDIT_FIELDS))
        db.session.commit()
        logger.info("Plan edited: id=%s name=%s", plan.id, plan.name)
        flash(f"Plan \'{plan.name}\' updated.", "success")
        return redirect(url_for("plans.index"))

    return render_template("admin/plans/form.html", mode="edit",
                           plan=plan, all_features=ALL_FEATURES)


@plans_bp.route("/<int:plan_id>/toggle-active", methods=["POST"])
@login_required
@superadmin_required
def toggle_active(plan_id):
    plan = Plan.query.get_or_404(plan_id)
    before = model_to_dict(plan, _AUDIT_FIELDS)
    plan.is_active = not plan.is_active
    action = "plan.activate" if plan.is_active else "plan.deactivate"
    log_admin_action(action, "plan", plan.id, before=before,
                     after=model_to_dict(plan, _AUDIT_FIELDS))
    db.session.commit()
    status = "activated" if plan.is_active else "deactivated"
    flash(f"Plan \'{plan.name}\' {status}.", "success")
    return redirect(url_for("plans.index"))


def _plan_from_form(plan):
    """Parse form data into a Plan object. Returns (plan, error_string|None)."""
    name = request.form.get("name", "").strip()
    if not name:
        return plan, "Plan name is required."

    try:
        price = float(request.form.get("price_monthly", 0))
    except ValueError:
        return plan, "Invalid price."

    max_staff_raw = request.form.get("max_staff", "").strip()
    max_loc_raw = request.form.get("max_locations", "").strip()
    max_staff = int(max_staff_raw) if max_staff_raw.isdigit() else None
    max_locations = int(max_loc_raw) if max_loc_raw.isdigit() else None

    features = {flag: (request.form.get(f"feature_{flag}") == "1") for flag in ALL_FEATURES}

    if plan is None:
        plan = Plan(name=name)
    else:
        plan.name = name

    plan.price_monthly = price
    plan.max_staff = max_staff
    plan.max_locations = max_locations
    plan.features_json = features
    plan.is_active = request.form.get("is_active") == "1"
    return plan, None