import os
from pathlib import Path
from flask import Blueprint, request, redirect, flash, session
from auth import require_level
from config_utils import (flush_pending_to_queue, get_dashboard_pending,
                          revert_snapshot_to_config, queued_msg,
                          SNAPSHOTS_DIR, DASHBOARD_PENDING)

_PAGE = Path(__file__).parent.name

bp = Blueprint(_PAGE, __name__)

@bp.route('/action/actions/pending_save', methods=['POST'])
@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'])
@require_level('administrator')
def pending_apply():
    pending = get_dashboard_pending()
    if not pending:
        flash('No pending changes to apply.', 'info')
        return redirect(f'/{_PAGE}')
    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'])
@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}')
    succeeded, failed = 0, 0
    for uuid in selected_uuids:
        msg, ok = revert_snapshot_to_config(uuid)
        if ok:
            succeeded += 1
        else:
            flash(msg, 'error')
            failed += 1
    if succeeded:
        plural = 's' if succeeded != 1 else ''
        flash(f'{succeeded} change{plural} reverted.', 'success')
    return redirect(f'/{_PAGE}')


@bp.route('/action/actions/history_clear', methods=['POST'])
@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
    for fname in os.listdir(SNAPSHOTS_DIR):
        if not fname.endswith('.json'):
            continue
        if any(fname.endswith(f'-{uuid}.json') for uuid in selected_uuids):
            fpath = os.path.join(SNAPSHOTS_DIR, fname)
            if os.path.isfile(fpath):
                os.remove(fpath)
                count += 1
    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'])
@require_level('manager')
def pending_dismiss():
    pending = 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(DASHBOARD_PENDING, 'w') as f:
        for u, t, c, usr in keep:
            f.write(f'{u} {t} [{c}] ({usr})\n')
    plural = 's' if len(dismissible) != 1 else ''
    flash(f'{len(dismissible)} pending change{plural} dismissed.', 'success')
    return redirect(f'/{_PAGE}')