// ─── Settings View ───

import { api } from '../api.js';

export class SettingsView {
  constructor(container, setStatus) {
    this.container = container;
    this.setStatus = setStatus;
    this.sections = [];
    this.changedValues = {};
  }

  async render() {
    this.container.innerHTML = `
      <div class="toolbar">
        <div class="toolbar-group">
          <button id="set-save-btn" class="btn btn-primary">💾 Speichern</button>
          <button id="set-reload-btn" class="btn">🔄 Neu laden</button>
        </div>
        <div id="set-status-msg" style="color: var(--text-muted); font-size: 11px;"></div>
      </div>

      <div class="settings-scroll" id="settings-form-container">
        <div style="text-align: center; padding: 20px; color: var(--text-muted);">Lade Einstellungen …</div>
      </div>
    `;

    document.getElementById('set-save-btn').addEventListener('click', () => this.save());
    document.getElementById('set-reload-btn').addEventListener('click', () => this.load());

    await this.load();
  }

  async load() {
    this.setStatus('Lade Einstellungen …');
    this.changedValues = {};

    try {
      const data = await api.get('/api/settings');
      if (!Array.isArray(data)) return;

      this.sections = data;
      const formContainer = document.getElementById('settings-form-container');
      if (!formContainer) return;

      formContainer.innerHTML = data.map((section, sIdx) => `
        <div class="settings-section">
          <div class="settings-section-header" onclick="this.nextElementSibling.style.display = this.nextElementSibling.style.display === 'none' ? 'grid' : 'none'">
            <span>${section.title}</span>
            <span style="font-size: 11px; color: var(--text-muted);">▾</span>
          </div>
          <div class="settings-section-body" id="section-body-${sIdx}">
            ${section.fields.map(f => this.renderField(f)).join('')}
          </div>
        </div>
      `).join('');

      // Wire input changes
      data.forEach(sec => {
        sec.fields.forEach(f => {
          const inputEl = document.getElementById(`field-${this.escapeId(f.path)}`);
          if (inputEl) {
            inputEl.addEventListener('change', () => {
              if (f.typeName === 'bool') {
                this.changedValues[f.path] = inputEl.checked;
              } else if (f.typeName === 'int' || f.typeName === 'decimal') {
                this.changedValues[f.path] = Number(inputEl.value);
              } else {
                this.changedValues[f.path] = inputEl.value;
              }
              document.getElementById('set-status-msg').textContent = `${Object.keys(this.changedValues).length} Änderung(en) ungespeichert`;
            });
          }
        });
      });

      this.setStatus('Einstellungen geladen.');
      document.getElementById('set-status-msg').textContent = 'Bereit.';
    } catch (err) {
      this.setStatus(`Fehler beim Laden: ${err.message}`);
    }
  }

  escapeId(path) {
    return path.replace(/[^a-zA-Z0-9_-]/g, '_');
  }

  renderField(f) {
    const id = `field-${this.escapeId(f.path)}`;
    let controlHtml = '';

    if (f.typeName === 'bool') {
      controlHtml = `<input type="checkbox" id="${id}" ${f.value ? 'checked' : ''} style="cursor: pointer;" />`;
    } else if (f.typeName === 'enum' && f.enumValues) {
      controlHtml = `
        <select id="${id}" style="width: 220px;">
          ${f.enumValues.map(opt => `<option value="${opt}" ${opt === f.value ? 'selected' : ''}>${opt}</option>`).join('')}
        </select>
      `;
    } else if (f.isPassword) {
      controlHtml = `
        <input type="password" id="${id}" class="input" placeholder="${f.hasValue ? '(unverändert gespeichert)' : '(kein Wert)'}" style="width: 320px;" />
      `;
    } else if (f.typeName === 'int' || f.typeName === 'decimal') {
      controlHtml = `
        <input type="number" id="${id}" class="input" value="${f.value ?? 0}" step="${f.typeName === 'decimal' ? '0.01' : '1'}" style="width: 140px;" />
      `;
    } else {
      controlHtml = `
        <input type="text" id="${id}" class="input" value="${this.escapeHtml(f.value ?? '')}" style="width: 360px;" />
      `;
    }

    return `
      <div>
        <div class="settings-label">${f.displayName}</div>
        ${f.description ? `<div class="settings-desc">${f.description}</div>` : ''}
      </div>
      <div>${controlHtml}</div>
    `;
  }

  escapeHtml(str) {
    return String(str)
      .replace(/&/g, '&amp;')
      .replace(/"/g, '&quot;')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;');
  }

  async save() {
    const count = Object.keys(this.changedValues).length;
    if (count === 0) {
      this.setStatus('Keine Änderungen vorhanden.');
      return;
    }

    this.setStatus(`Speichere ${count} Einstellung(en) …`);

    try {
      const res = await api.post('/api/settings', { updates: this.changedValues });
      this.setStatus(res.message || 'Einstellungen erfolgreich gespeichert.');
      document.getElementById('set-status-msg').textContent = 'Gespeichert.';
      await this.load();
    } catch (err) {
      this.setStatus(`Speichern fehlgeschlagen: ${err.message}`);
    }
  }
}