from pathlib import Path
from flask import Blueprint, request, redirect, flash, session
import auth
import config_utils

_PAGE = Path(__file__).parent.name

bp = Blueprint(_PAGE, __name__)

@bp.route('/action/actions/pending_save', methods=['POST'])
@auth.require_level('administrator')
def pending_save():
    session['apply_changes_immediately'] = 'apply_changes_immediately' in request.form
    flash('Preference saved.', 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/actions/pending_apply', methods=['POST'])
@auth.require_level('administrator')
def pending_apply():
    pending = config_utils.get_dashboard_pending()
    if not pending:
        flash('No pending changes to apply.', 'info')
        return redirect(f'/{_PAGE}')
    config_utils.flush_pending_to_queue()
    if any(cmd != 'fix problems' for _, _, cmd, _ in pending):
        flash('Changes queued.', 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/actions/history_revert', methods=['POST'])
@auth.require_level('administrator')
def history_revert():
    selected_uuids = request.form.getlist('selected_uuids')
    if not selected_uuids:
        flash('No items selected.', 'info')
        return redirect(f'/{_PAGE}')
    if len(selected_uuids) != 1:
        flash('Please select exactly one change to revert.', 'error')
        return redirect(f'/{_PAGE}')

    behavior = request.form.get('revert_behavior', 'revert_subsequent')
    errors, succeeded, failed = config_utils.revert_group_chain(selected_uuids[0])

    for msg in errors:
        flash(msg, 'error')
    if succeeded:
        s = 's' if succeeded != 1 else ''
        if behavior == 'restore_state':
            flash(f'Config restored to selected state ({succeeded} change{s} reverted).', 'success')
        else:
            flash(f'{succeeded} change{s} reverted.', 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/actions/history_clear', methods=['POST'])
@auth.require_level('manager')
def history_clear():
    selected_uuids = request.form.getlist('selected_uuids')
    if not selected_uuids:
        flash('No items selected.', 'info')
        return redirect(f'/{_PAGE}')
    count = 0
    conn = config_utils._db()
    try:
        for uid in selected_uuids:
            conn.execute('DELETE FROM changes WHERE group_id=?', (uid,))
            result = conn.execute('DELETE FROM groups WHERE uuid=?', (uid,))
            count += result.rowcount
        conn.commit()
    finally:
        conn.close()
    plural = 's' if count != 1 else ''
    flash(f'{count} history record{plural} cleared.', 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/actions/pending_dismiss', methods=['POST'])
@auth.require_level('manager')
def pending_dismiss():
    pending = config_utils.get_dashboard_pending()
    dismissible = [(u, t, c, usr) for u, t, c, usr in pending if c != 'fix problems']
    if not dismissible:
        flash('No pending changes to dismiss.', 'info')
        return redirect(f'/{_PAGE}')
    keep = [(u, t, c, usr) for u, t, c, usr in pending if c == 'fix problems']
    with open(config_utils.DASHBOARD_PENDING, 'w') as f:
        for u, t, c, usr in keep:
            f.write(f'{u} {t} [{c}] ({usr})\n')
    flash('Pending changes dismissed.', 'success')
    return redirect(f'/{_PAGE}')