from pathlib import Path
import copy

from flask import Blueprint, request, redirect, flash
from auth import require_level
from config_utils import load_config, record_group, diff_fields, verify_config_hash
import sanitize
import mod_validation as validate

_PAGE = Path(__file__).parent.name

bp = Blueprint(_PAGE, __name__)

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/bannedips/addip_add', methods=['POST'])
@require_level('administrator')
def addip_add():
    description = sanitize.text(request.form.get('description', ''))
    ip          = _parse_ip()
    if ip is None:
        return redirect(f'/{_PAGE}')
    if not _hash_ok():
        return redirect(f'/{_PAGE}')

    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(f'/{_PAGE}')

    changes = diff_fields(None, entry)
    flash(record_group(cfg, 'banned_ips', 'ip', ip, changes, 'core apply'), 'success')
    return redirect(f'/{_PAGE}')


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

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

    old_enabled        = items[idx].get('enabled', True)
    before             = copy.deepcopy(items[idx])
    items[idx]['enabled'] = not old_enabled
    errors = validate.validate_config(cfg)
    if errors:
        for msg in errors:
            flash(msg, 'error')
        return redirect(f'/{_PAGE}')

    ip = items[idx]['ip']
    changes = diff_fields(before, items[idx])
    flash(record_group(cfg, 'banned_ips', 'ip', ip, changes, 'core apply'), 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/bannedips/table_edit', methods=['POST'])
@require_level('administrator')
def table_edit():
    idx = _row_index()
    if idx is None:
        flash('Invalid request.', 'error')
        return redirect(f'/{_PAGE}')

    description = sanitize.text(request.form.get('description', ''))
    ip          = _parse_ip()
    if ip is None:
        return redirect(f'/{_PAGE}')
    enabled = request.form.get('enabled') == 'on'

    if not _hash_ok():
        return redirect(f'/{_PAGE}')

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

    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(f'/{_PAGE}')

    changes = diff_fields(before, items[idx])
    flash(record_group(cfg, 'banned_ips', 'ip', ip, changes, 'core apply'), 'success')
    return redirect(f'/{_PAGE}')


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

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

    removed = items.pop(idx)
    errors = validate.validate_config(cfg)
    if errors:
        for msg in errors:
            flash(msg, 'error')
        return redirect(f'/{_PAGE}')

    changes = diff_fields(removed, None)
    flash(record_group(cfg, 'banned_ips', 'ip', removed['ip'], changes, 'core apply'), 'success')
    return redirect(f'/{_PAGE}')