<?php
declare(strict_types=1);

final class FilePicker
{
    public static function styles(): string
    {
        return <<<'CSS'
.br-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.br-modal {
  width: min(560px, 92vw);
  background: #ffffff;
  border-radius: 12px;
  padding: 16px;
  border: 2px solid #d8dde6;
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
}
.br-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 12px;
}
.br-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}
.br-modal-title {
  font-weight: 700;
  font-size: 16px;
}
.br-modal-body {
  max-height: 60vh;
  overflow: auto;
}
.br-muted { color: #64748b; }
.br-alert {
  border-radius: 8px;
  padding: 10px 12px;
  margin: 8px 0;
  border: 1px solid transparent;
}
.br-alert-error { background: #fff1f2; border-color: #fecdd3; color: #9f1239; }
.br-picker-path {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.br-picker-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border: 1px solid #d8dde6;
  border-radius: 10px;
  max-height: 45vh;
  overflow: auto;
}
.br-picker-create {
  margin-top: 10px;
  display: flex;
  gap: 8px;
}
.br-picker-create input {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid #d8dde6;
  border-radius: 8px;
}
.br-picker-list li {
  padding: 8px 12px;
  cursor: pointer;
  border-bottom: 1px solid #d8dde6;
}
.br-picker-list li:last-child {
  border-bottom: none;
}
.br-picker-list li:hover {
  background: #f8fafc;
}
.br-picker-list li.active {
  background: #e0f2fe;
}
.br-btn {
  background: #b77200;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  font-weight: 600;
}
.br-btn:hover { background: #9a6200; }
.br-btn-ghost {
  background: transparent;
  color: #1f2d3d;
  border: 1px solid #d8dde6;
}
.br-btn-ghost:hover { background: #eef2f7; }
.br-btn-small {
  padding: 6px 10px;
  font-size: 12px;
}
.br-icon-btn {
  border: 1px solid #d8dde6;
  background: #fff;
  border-radius: 8px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}
.br-icon-btn:hover {
  background: #f8fafc;
}
CSS;
    }

    public static function scripts(): string
    {
        return <<<'JS'
  var pickerTarget = null;
  var pickerPath = '';
  var pickerBase = '';
  var pickerMode = 'dir';
  var pickerSelected = '';
  var pickerUrl = '';
  var pickerRoot = '';

  function openPicker(inputId, mode) {
    var modal = document.getElementById('br-picker');
    if (!modal) { return; }
    var target = document.getElementById(inputId);
    if (!target) { return; }
    pickerTarget = target;
    pickerMode = mode === 'file' ? 'file' : 'dir';
    pickerSelected = '';
    pickerUrl = modal.getAttribute('data-picker-url') || window.location.href;
    pickerRoot = modal.getAttribute('data-picker-root') || '';

    var initial = (target.value || '').trim();
    if (initial === '') {
      initial = pickerRoot || '';
    }
    var createRow = document.getElementById('br-picker-create');
    if (createRow) {
      createRow.style.display = (pickerMode === 'dir') ? 'flex' : 'none';
    }
    loadPicker(initial);
    modal.style.display = 'flex';
  }

  function closePicker() {
    var modal = document.getElementById('br-picker');
    if (modal) { modal.style.display = 'none'; }
  }

  function pickerSetError(msg) {
    var el = document.getElementById('br-picker-error');
    if (!el) { return; }
    if (msg) {
      el.textContent = msg;
      el.style.display = 'block';
    } else {
      el.textContent = '';
      el.style.display = 'none';
    }
  }

  function renderPickerList(items) {
    var list = document.getElementById('br-picker-list');
    if (!list) { return; }
    list.innerHTML = '';
    if (!items || !items.length) {
      var empty = document.createElement('li');
      empty.textContent = pickerMode === 'file' ? tr('Brak plików .sql/.gz') : tr('Brak katalogów');
      empty.className = 'br-muted';
      list.appendChild(empty);
      return;
    }
    items.forEach(function (entry) {
      var li = document.createElement('li');
      if (entry.type === 'dir') {
        li.textContent = '📁 ' + entry.name + '/';
        li.addEventListener('click', function () {
          pickerSelected = '';
          loadPicker(pickerPath.replace(/\/+$/, '') + '/' + entry.name);
        });
      } else {
        var full = pickerPath.replace(/\/+$/, '') + '/' + entry.name;
        li.textContent = '📄 ' + entry.name;
        li.addEventListener('click', function () {
          pickerSelected = full;
          var active = list.querySelectorAll('li.active');
          for (var i = 0; i < active.length; i += 1) {
            active[i].classList.remove('active');
          }
          li.classList.add('active');
        });
        if (pickerSelected === full) {
          li.classList.add('active');
        }
      }
      list.appendChild(li);
    });
  }

  function extractPickerJson(text) {
    var marker = '__DA_MYSQL_PICKER_JSON__';
    var start = text.indexOf(marker);
    if (start === -1) { return null; }
    start += marker.length;
    var end = text.indexOf(marker, start);
    if (end === -1) { return null; }
    var jsonText = text.substring(start, end).trim();
    try { return JSON.parse(jsonText); } catch (e) { return null; }
  }

  function loadPicker(path) {
    pickerSetError('');
    var url = pickerUrl + '?action=dir_list&mode=' + encodeURIComponent(pickerMode) + '&path=' + encodeURIComponent(path || '');
    fetch(url, { credentials: 'same-origin' })
      .then(function (r) { return r.text(); })
      .then(function (text) {
        var data = extractPickerJson(text || '');
        if (!data || !data.ok) {
          pickerSetError(tr('Nie udało się wczytać katalogów.'));
          return;
        }
        pickerPath = data.path || '';
        pickerBase = data.base || '';
        if (data.selected) {
          pickerSelected = data.selected;
        }
        var current = document.getElementById('br-picker-current');
        if (current) { current.textContent = pickerPath; }
        renderPickerList(data.items || []);
      })
      .catch(function () {
        pickerSetError(tr('Nie udało się wczytać katalogów.'));
      });
  }

  function pickerGoUp() {
    if (!pickerPath) { return; }
    if (pickerBase && pickerPath === pickerBase) { return; }
    var up = pickerPath.replace(/\/+$/, '');
    up = up.substring(0, up.lastIndexOf('/')) || '/';
    loadPicker(up);
  }

  function createPickerDir() {
    var input = document.getElementById('br-picker-new');
    if (!input) { return; }
    var name = (input.value || '').trim();
    if (name === '') {
      pickerSetError(tr('Podaj nazwę katalogu.'));
      return;
    }
    pickerSetError('');
    var url = pickerUrl + '?action=dir_create&path=' + encodeURIComponent(pickerPath || '') + '&name=' + encodeURIComponent(name);
    fetch(url, { credentials: 'same-origin' })
      .then(function (r) { return r.text(); })
      .then(function (text) {
        var data = extractPickerJson(text || '');
        if (!data || !data.ok) {
          pickerSetError(tr('Nie udało się utworzyć katalogu.'));
          return;
        }
        input.value = '';
        loadPicker(pickerPath);
      })
      .catch(function () {
        pickerSetError(tr('Nie udało się utworzyć katalogu.'));
      });
  }

  function selectPickerPath() {
    if (!pickerTarget) { closePicker(); return; }
    if (pickerMode === 'file' && pickerSelected) {
      pickerTarget.value = pickerSelected || '';
    } else if (pickerMode === 'dir') {
      pickerTarget.value = pickerPath || '';
    }
    try {
      pickerTarget.dispatchEvent(new Event('input', { bubbles: true }));
      pickerTarget.dispatchEvent(new Event('change', { bubbles: true }));
    } catch (e) {
      // ignore dispatch errors on older browsers
    }
    if (typeof window.__restoreFileSync === 'function') {
      window.__restoreFileSync();
    }
    closePicker();
  }

  function bindFilePicker() {
    window.openPicker = openPicker;
    window.closePicker = closePicker;
    window.pickerGoUp = pickerGoUp;
    window.createPickerDir = createPickerDir;
    window.selectPickerPath = selectPickerPath;
  }
JS;
    }

    public static function renderOverlay(AppContext $ctx, string $overlayId, string $rootPath, string $listUrl, string $inputId = 'source-file-path'): string
    {
        $safeRoot = AppContext::e($rootPath);
        $safeUrl = AppContext::e($listUrl);

        $title = $ctx->t('Wybierz plik');
        $close = $ctx->t('Zamknij');
        $up = $ctx->t('W górę');
        $newDir = $ctx->t('Nowy katalog');
        $create = $ctx->t('Utwórz');
        $cancel = $ctx->t('Anuluj');
        $choose = $ctx->t('Wybierz');

        $html = '';
        $html .= '<div id="br-picker" class="br-overlay" style="display:none;" data-picker-url="' . $safeUrl . '" data-picker-root="' . $safeRoot . '">';
        $html .= '<div class="br-modal">';
        $html .= '<div class="br-modal-header"><div class="br-modal-title">' . AppContext::e($title) . '</div><button class="br-btn br-btn-ghost br-btn-small" type="button" onclick="closePicker();">' . AppContext::e($close) . '</button></div>';
        $html .= '<div class="br-modal-body">';
        $html .= '<div class="br-picker-path"><button class="br-btn br-btn-ghost br-btn-small" type="button" onclick="pickerGoUp();">⟵ ' . AppContext::e($up) . '</button><span id="br-picker-current" class="br-muted"></span></div>';
        $html .= '<div id="br-picker-error" class="br-alert br-alert-error" style="display:none;"></div>';
        $html .= '<ul id="br-picker-list" class="br-picker-list"></ul>';
        $html .= '<div id="br-picker-create" class="br-picker-create" style="display:none;">';
        $html .= '<input id="br-picker-new" type="text" placeholder="' . AppContext::e($newDir) . '" />';
        $html .= '<button class="br-btn br-btn-ghost br-btn-small" type="button" onclick="createPickerDir();">' . AppContext::e($create) . '</button>';
        $html .= '</div>';
        $html .= '</div>';
        $html .= '<div class="br-modal-actions">';
        $html .= '<button class="br-btn br-btn-ghost" type="button" onclick="closePicker();">' . AppContext::e($cancel) . '</button>';
        $html .= '<button class="br-btn" type="button" onclick="selectPickerPath();">' . AppContext::e($choose) . '</button>';
        $html .= '</div>';
        $html .= '</div></div>';

        return $html;
    }

    public static function handleDirList(AppContext $ctx, BackupQueueService $queue, string $rootPath): bool
    {
        $action = strtolower($ctx->queryString('action'));
        if ($action !== 'dir_list') {
            return false;
        }

        while (ob_get_level() > 0) {
            @ob_end_clean();
        }

        $base = self::normalizeBase($rootPath);
        $mode = strtolower($ctx->queryString('mode', 'dir')) === 'file' ? 'file' : 'dir';
        $requested = trim($ctx->queryString('path', $base));
        if ($requested === '') {
            $requested = $base;
        }
        if ($requested !== '' && $requested[0] !== '/') {
            $requested = '/' . $requested;
        }

        $selected = '';
        if ($mode === 'file' && $requested !== '') {
            $realReq = @realpath($requested);
            if ($realReq !== false && is_file($realReq)) {
                $selected = $realReq;
                $requested = dirname($realReq);
            }
        }

        [$resolved, $base, $ok] = self::resolvePickerPath($requested, $base);
        if (!$ok) {
            self::pickerOutput(['ok' => false, 'error' => 'Nieprawidłowa ścieżka.']);
            exit;
        }

        if ($base !== '/' && $selected !== '') {
            if (strpos($selected, $base . '/') !== 0 && $selected !== $base) {
                $selected = '';
            }
        }

        $dirItems = [];
        $fileItems = [];
        $entries = @scandir($resolved);
        if (is_array($entries)) {
            foreach ($entries as $entry) {
                if ($entry === '.' || $entry === '..') {
                    continue;
                }
                $full = $resolved . '/' . $entry;
                if (is_dir($full)) {
                    $dirItems[] = $entry;
                } elseif ($mode === 'file' && is_file($full) && $queue->isAllowedSqlFile($full)) {
                    $fileItems[] = $entry;
                }
            }
        }

        natcasesort($dirItems);
        natcasesort($fileItems);
        $items = [];
        foreach ($dirItems as $name) {
            $items[] = ['name' => $name, 'type' => 'dir'];
        }
        foreach ($fileItems as $name) {
            $items[] = ['name' => $name, 'type' => 'file'];
        }

        self::pickerOutput([
            'ok' => true,
            'path' => $resolved,
            'base' => $base,
            'items' => $items,
            'selected' => $selected,
        ]);
        exit;
    }

    public static function handleDirCreate(AppContext $ctx, string $rootPath, string $daUser): bool
    {
        $action = strtolower($ctx->queryString('action'));
        if ($action !== 'dir_create') {
            return false;
        }

        while (ob_get_level() > 0) {
            @ob_end_clean();
        }

        $base = self::normalizeBase($rootPath);
        $parentReq = trim($ctx->queryString('path', $base));
        if ($parentReq !== '' && $parentReq[0] !== '/') {
            $parentReq = '/' . $parentReq;
        }
        [$parent, $base, $ok] = self::resolvePickerPath($parentReq, $base);
        $name = trim($ctx->queryString('name'));
        if ($name === '' || $name === '.' || $name === '..' || strpos($name, '/') !== false || strpos($name, '\\') !== false) {
            self::pickerOutput(['ok' => false, 'error' => 'invalid_name']);
            exit;
        }
        if (!$ok || !is_dir($parent)) {
            self::pickerOutput(['ok' => false, 'error' => 'invalid_parent']);
            exit;
        }

        $newPath = rtrim($parent, '/') . '/' . $name;
        if ($base !== '/' && strpos($newPath, $base . '/') !== 0 && $newPath !== $base) {
            self::pickerOutput(['ok' => false, 'error' => 'outside_base']);
            exit;
        }
        if (file_exists($newPath)) {
            self::pickerOutput(['ok' => false, 'error' => 'exists']);
            exit;
        }
        if (!@mkdir($newPath, 0700, true)) {
            self::pickerOutput(['ok' => false, 'error' => 'mkdir_failed']);
            exit;
        }
        @chown($newPath, $daUser);
        @chgrp($newPath, $daUser);
        self::pickerOutput(['ok' => true, 'path' => $parent, 'base' => $base, 'created' => $newPath]);
        exit;
    }

    /**
     * @param array<string,mixed> $payload
     */
    private static function pickerOutput(array $payload): void
    {
        $json = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_INVALID_UTF8_SUBSTITUTE);
        if ($json === false) {
            $json = json_encode(['ok' => false, 'error' => 'json_encode_failed'], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        }
        $marker = '__DA_MYSQL_PICKER_JSON__';
        header('Content-Type: text/plain; charset=UTF-8');
        echo $marker . "\n" . $json . "\n" . $marker;
    }

    private static function normalizeBase(string $base): string
    {
        $base = trim($base);
        if ($base === '') {
            return '/';
        }
        if ($base[0] !== '/') {
            $base = '/' . $base;
        }
        if ($base !== '/' && substr($base, -1) === '/') {
            $base = rtrim($base, '/');
        }
        return $base === '' ? '/' : $base;
    }

    /**
     * @return array{0:string,1:string,2:bool}
     */
    private static function resolvePickerPath(string $requested, string $base): array
    {
        $base = self::normalizeBase($base);
        $candidate = trim($requested);
        if ($candidate === '') {
            $candidate = $base;
        }
        if ($candidate[0] !== '/') {
            $candidate = '/' . $candidate;
        }
        $resolved = @realpath($candidate);
        if ($resolved === false || !is_dir($resolved)) {
            $resolved = @realpath($base);
        }
        if ($resolved === false || !is_dir($resolved)) {
            return [$base, $base, false];
        }
        if ($base !== '/' && strpos($resolved, $base . '/') !== 0 && $resolved !== $base) {
            $resolved = @realpath($base);
        }
        if ($resolved === false || !is_dir($resolved)) {
            return [$base, $base, false];
        }
        return [$resolved, $base, true];
    }
}