<script lang="ts">
  import { onMount } from "svelte";
  import { getCurrentWindow } from "@tauri-apps/api/window";
  import { platform } from "@tauri-apps/plugin-os";

  const win      = getCurrentWindow();
  const os       = platform();
  const isMac    = os === "macos";
  const isWindows = os === "windows";

  let isFullscreen = $state(false);

  onMount(async () => {
    isFullscreen = await win.isFullscreen();
    const unlisten = await win.onResized(async () => {
      isFullscreen = await win.isFullscreen();
    });
    return unlisten;
  });
</script>

{#if !isFullscreen}
  <div class="bar" data-tauri-drag-region>
    {#if isMac}<div class="mac-spacer"></div>{/if}
    <span class="title" data-tauri-drag-region>Moku</span>
    {#if !isMac}
      <div class="controls">
        <button onclick={() => win.minimize()} title="Minimize" aria-label="Minimize">
          <svg width="10" height="1" viewBox="0 0 10 1">
            <line x1="0" y1="0.5" x2="10" y2="0.5" stroke="currentColor" stroke-width="1.5" />
          </svg>
        </button>
        <button onclick={() => win.toggleMaximize()} title="Maximize" aria-label="Maximize">
          <svg width="9" height="9" viewBox="0 0 9 9">
            <rect x="0.75" y="0.75" width="7.5" height="7.5" rx="1" fill="none" stroke="currentColor" stroke-width="1.5" />
          </svg>
        </button>
        <button class="close" onclick={() => win.close()} title="Close" aria-label="Close">
          <svg width="10" height="10" viewBox="0 0 10 10">
            <line x1="1" y1="1" x2="9" y2="9" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" />
            <line x1="9" y1="1" x2="1" y2="9" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" />
          </svg>
        </button>
      </div>
    {/if}
  </div>
{:else if isWindows}
  <!-- On Windows, fullscreen hides the native titlebar — show a hoverable overlay so the user isn't locked in -->
  <div class="fullscreen-controls">
    <button onclick={() => win.setFullscreen(false)} title="Exit Fullscreen" aria-label="Exit Fullscreen">
      <svg width="10" height="10" viewBox="0 0 10 10">
        <polyline points="1,4 1,1 4,1" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
        <polyline points="6,1 9,1 9,4" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
        <polyline points="9,6 9,9 6,9" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
        <polyline points="4,9 1,9 1,6" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
      </svg>
    </button>
    <button class="close" onclick={() => win.close()} title="Close" aria-label="Close">
      <svg width="10" height="10" viewBox="0 0 10 10">
        <line x1="1" y1="1" x2="9" y2="9" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" />
        <line x1="9" y1="1" x2="1" y2="9" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" />
      </svg>
    </button>
  </div>
{/if}

<style>
  .fullscreen-controls {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 4px;
    opacity: 0;
    transition: opacity 0.2s ease;
    -webkit-app-region: no-drag;
  }
  .fullscreen-controls:hover { opacity: 1; }

  .bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 32px;
    padding: 0 var(--sp-3) 0 var(--sp-4);
    background: var(--bg-void);
    border-bottom: 1px solid var(--border-dim);
    flex-shrink: 0;
    user-select: none;
    -webkit-app-region: drag;
  }
  /* Spacer to clear the native macOS traffic lights (~70px) */
  .mac-spacer {
    width: 70px;
    flex-shrink: 0;
    -webkit-app-region: drag;
  }
  .title {
    font-family: var(--font-ui);
    font-size: var(--text-2xs);
    color: var(--text-faint);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    -webkit-app-region: drag;
  }
  .controls {
    display: flex;
    align-items: center;
    gap: 2px;
    -webkit-app-region: no-drag;
  }
  button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px; height: 28px;
    border-radius: var(--radius-sm);
    color: var(--text-faint);
    transition: color var(--t-base), background var(--t-base);
    -webkit-app-region: no-drag;
  }
  button:hover { color: var(--text-muted); background: var(--bg-raised); }
  .close:hover { color: #fff; background: #c0392b; }
</style>
