import copy

from flask import Blueprint, request, redirect, flash
from auth import require_level
from config_utils import load_config, save_config_with_snapshot, verify_config_hash
import sanitize
import validation as validate

bp = Blueprint('action_apply_banned_ips', __name__)

VIEW = '/view/view_banned_ips'


def _row_index():
    try:
        return int(request.form.get('row_index', ''))
    except (ValueError, TypeError):
        return None


def _hash_ok():
    if not verify_config_hash(request.form.get('config_hash', '')):
        flash('Configuration was modified by another session. Please refresh and try again.', 'error')
        return False
    return True


def _parse_ip():
    raw = request.form.get('ip', '').strip()
    if not raw:
        flash('The configuration has not been saved because an IP address, CIDR, or wildcard pattern is required.', 'error')
        return None
    ip = validate.banned_ip(raw)
    if not ip:
        flash(f'The configuration has not been saved because "{raw}" is not a valid IP address, CIDR, or wildcard pattern.', 'error')
        return None
    return ip


@bp.route('/action/add_banned_ip', methods=['POST'])
@require_level('administrator')
def add_banned_ip():
    description = sanitize.text(request.form.get('description', ''))
    ip          = _parse_ip()
    if ip is None:
        return redirect(VIEW)
    if not _hash_ok():
        return redirect(VIEW)

    cfg  = load_config()
    entry = {'description': description, 'ip': ip, 'enabled': True}
    cfg.setdefault('banned_ips', []).append(entry)
    errors = validate.validate_config(cfg)
    if errors:
        for msg in errors:
            flash(msg, 'error')
        return redirect(VIEW)

    flash(save_config_with_snapshot(
        cfg,
        path='banned_ips', key=ip, operation='add',
        before=None, after=entry,
        description=f'Added banned IP: {ip}',
    ), 'success')
    return redirect(VIEW)


@bp.route('/action/toggle_banned_ip', methods=['POST'])
@require_level('administrator')
def toggle_banned_ip():
    idx = _row_index()
    if idx is None:
        flash('Invalid request.', 'error')
        return redirect(VIEW)
    if not _hash_ok():
        return redirect(VIEW)

    cfg  = load_config()
    items = cfg.get('banned_ips', [])
    if idx < 0 or idx >= len(items):
        flash('Entry not found.', 'error')
        return redirect(VIEW)

    old_enabled        = items[idx].get('enabled', True)
    items[idx]['enabled'] = not old_enabled
    errors = validate.validate_config(cfg)
    if errors:
        for msg in errors:
            flash(msg, 'error')
        return redirect(VIEW)

    action = 'Enabled' if not old_enabled else 'Disabled'
    flash(save_config_with_snapshot(
        cfg,
        path='banned_ips', key=items[idx]['ip'], operation='toggle',
        before={'enabled': old_enabled}, after={'enabled': not old_enabled},
        description=f'{action} banned IP: {items[idx]["ip"]}',
    ), 'success')
    return redirect(VIEW)


@bp.route('/action/edit_banned_ip', methods=['POST'])
@require_level('administrator')
def edit_banned_ip():
    idx = _row_index()
    if idx is None:
        flash('Invalid request.', 'error')
        return redirect(VIEW)

    description = sanitize.text(request.form.get('description', ''))
    ip          = _parse_ip()
    if ip is None:
        return redirect(VIEW)
    enabled = request.form.get('enabled') == 'on'

    if not _hash_ok():
        return redirect(VIEW)

    cfg  = load_config()
    items = cfg.get('banned_ips', [])
    if idx < 0 or idx >= len(items):
        flash('Entry not found.', 'error')
        return redirect(VIEW)

    before = copy.deepcopy(items[idx])
    items[idx].update({'description': description, 'ip': ip, 'enabled': enabled})
    errors = validate.validate_config(cfg)
    if errors:
        for msg in errors:
            flash(msg, 'error')
        return redirect(VIEW)

    flash(save_config_with_snapshot(
        cfg,
        path='banned_ips', key=ip, operation='edit',
        before=before, after=copy.deepcopy(items[idx]),
        description=f'Edited banned IP: {ip}',
    ), 'success')
    return redirect(VIEW)


@bp.route('/action/delete_banned_ip', methods=['POST'])
@require_level('administrator')
def delete_banned_ip():
    idx = _row_index()
    if idx is None:
        flash('Invalid request.', 'error')
        return redirect(VIEW)
    if not _hash_ok():
        return redirect(VIEW)

    cfg  = load_config()
    items = cfg.get('banned_ips', [])
    if idx < 0 or idx >= len(items):
        flash('Entry not found.', 'error')
        return redirect(VIEW)

    removed = items.pop(idx)
    errors = validate.validate_config(cfg)
    if errors:
        for msg in errors:
            flash(msg, 'error')
        return redirect(VIEW)

    flash(save_config_with_snapshot(
        cfg,
        path='banned_ips', key=removed['ip'], operation='delete',
        before=removed, after=None,
        description=f'Deleted banned IP: {removed["ip"]}',
    ), 'success')
    return redirect(VIEW)