<script lang="ts">
  import { createEventDispatcher } from 'svelte';
  import type { Metadata } from '../types';

  export let metadata: Metadata;

  const dispatch = createEventDispatcher<{
    update: Partial<Metadata>;
  }>();

  function handleInput(field: keyof Metadata, value: string) {
    dispatch('update', { [field]: value || null });
  }

  function handleToggle(field: keyof Metadata, value: boolean) {
    dispatch('update', { [field]: value });
  }

  function updateTimestamp() {
    dispatch('update', { timestamp: new Date().toISOString() });
  }

  function formatTimestamp(timestamp: string | null): string {
    if (!timestamp) return '';
    try {
      return new Date(timestamp).toLocaleString();
    } catch {
      return timestamp;
    }
  }
</script>

<section class="metadata">
  <div class="metadata-field">
    <label for="protocol">Protocol:</label>
    <input
      id="protocol"
      type="text"
      placeholder="What protocol are you analyzing?"
      value={metadata.protocol || ''}
      on:input={(e) => handleInput('protocol', e.currentTarget.value)}
    />
  </div>

  <div class="metadata-field">
    <label for="description">Description:</label>
    <textarea
      id="description"
      placeholder="Briefly, what is this protocol?"
      value={metadata.description || ''}
      on:input={(e) => handleInput('description', e.currentTarget.value)}
      rows="3"
    />
  </div>

  <div class="metadata-field">
    <label for="analyst">Analyst:</label>
    <input
      id="analyst"
      type="text"
      placeholder="How do you identify yourself?"
      value={metadata.analyst || ''}
      on:input={(e) => handleInput('analyst', e.currentTarget.value)}
    />
  </div>

  <div class="metadata-field">
    <label for="standpoint">Standpoint:</label>
    <input
      id="standpoint"
      type="text"
      placeholder="What is your relationship to the protocol?"
      value={metadata.standpoint || ''}
      on:input={(e) => handleInput('standpoint', e.currentTarget.value)}
    />
  </div>

  <div class="metadata-field">
    <label for="timestamp">Timestamp:</label>
    <div class="timestamp-display">
      <input
        id="timestamp"
        type="text"
        readonly
        value={formatTimestamp(metadata.timestamp)}
        placeholder="[Auto-generated]"
      />
      <button on:click={updateTimestamp} aria-label="Update timestamp">
        🕐 Update
      </button>
    </div>
  </div>

  <div class="metadata-field toggle-field">
    <label for="shortform">Short Form:</label>
    <div class="toggle-container">
      <label class="toggle-switch">
        <input
          id="shortform"
          type="checkbox"
          checked={metadata.shortform}
          on:change={(e) => handleToggle('shortform', e.currentTarget.checked)}
        />
        <span class="slider"></span>
      </label>
      <span class="toggle-label">{metadata.shortform ? 'Enabled' : 'Disabled'}</span>
    </div>
  </div>
</section>

<style>
  .metadata {
    margin: 2rem 0;
    padding: 1rem;
    border: 2px solid var(--border-color);
  }

  .metadata-field {
    margin: 0.5rem 0;
  }

  label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: bold;
  }

  textarea {
    width: 100%;
    padding: 0.5rem;
    font-family: inherit;
    font-size: inherit;
    resize: vertical;
    min-height: 4rem;
  }

  .timestamp-display {
    display: flex;
    gap: 0.5rem;
  }

  .timestamp-display input {
    flex: 1;
    opacity: 0.7;
  }

  .timestamp-display button {
    flex-shrink: 0;
  }

  .toggle-field {
    display: flex;
    align-items: center;
    gap: 1rem;
  }

  .toggle-field > label {
    margin-bottom: 0;
  }

  .toggle-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
    margin-bottom: 0;
    cursor: pointer;
  }

  .toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
  }

  .slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    border-radius: 26px;
    transition: 0.3s;
  }

  .slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: 0.3s;
  }

  .toggle-switch input:checked + .slider {
    background-color: var(--primary-color, #4CAF50);
  }

  .toggle-switch input:checked + .slider:before {
    transform: translateX(24px);
  }

  .toggle-label {
    font-size: 0.9rem;
    opacity: 0.8;
  }

  @media (max-width: 900px) {
    .metadata {
      padding: 0.5rem;
    }

    .timestamp-display {
      flex-direction: column;
    }

    .timestamp-display button {
      width: 100%;
    }

    .toggle-field {
      flex-direction: column;
      align-items: flex-start;
    }
  }
</style>
