---
import { Icon } from "astro-icon/components";
import type { Locale } from "../../lib/site-config";
import { t } from "../../i18n/ui";

export interface Props {
  locale?: Locale;
}

const { locale = "en" } = Astro.props as Props;
const labelDark = t(locale, "nav.darkMode");
const labelLight = t(locale, "nav.lightMode");
---

<button
  type="button"
  class="theme-toggle"
  aria-label={labelDark}
  aria-pressed="false"
  data-theme-toggle
  data-theme="light"
>
  <Icon
    name="lucide:sun"
    class="theme-toggle__icon theme-toggle__icon--light"
  />
  <Icon
    name="lucide:moon"
    class="theme-toggle__icon theme-toggle__icon--dark"
  />
  <span class="theme-toggle__label" data-theme-label>{labelDark}</span>
</button>

<script is:inline define:vars={{ labelDark, labelLight }}>
  const storageKey = "theme";
  const root = document.documentElement;
  const button = document.querySelector("[data-theme-toggle]");

  const label = button?.querySelector("[data-theme-label]");

  const syncTheme = (theme) => {
    const isDark = theme === "dark";
    root.classList.toggle("dark", isDark);
    if (button) {
      button.setAttribute("aria-pressed", String(isDark));
      button.setAttribute("data-theme", theme);
      button.setAttribute("aria-label", isDark ? labelLight : labelDark);
    }
    if (label) {
      label.textContent = isDark ? labelLight : labelDark;
    }
  };

  // Keep the main site and the Starlight /docs section in sync by mirroring the
  // choice into both storage keys.
  const starlightKey = "starlight-theme";

  try {
    const storedTheme =
      localStorage.getItem(storageKey) || localStorage.getItem(starlightKey);
    const preferredTheme = window.matchMedia("(prefers-color-scheme: dark)")
      .matches
      ? "dark"
      : "light";
    syncTheme(
      storedTheme === "dark" || storedTheme === "light"
        ? storedTheme
        : preferredTheme,
    );

    button?.addEventListener("click", () => {
      const nextTheme = root.classList.contains("dark") ? "light" : "dark";
      localStorage.setItem(storageKey, nextTheme);
      localStorage.setItem(starlightKey, nextTheme);
      syncTheme(nextTheme);
    });
  } catch {
    // Ignore storage failures and preserve the bootstrap theme.
  }
</script>

<style>
  .theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
  }

  .theme-toggle:hover {
    border-color: var(--color-brand-primary);
    color: var(--color-brand-primary);
    background: var(--color-bg-secondary);
    transform: scale(1.05);
  }

  .theme-toggle:focus-visible {
    outline: 2px solid var(--ring);
    outline-offset: 2px;
  }

  .theme-toggle:active {
    transform: scale(0.95);
  }

  .theme-toggle__icon {
    width: 1.15rem;
    height: 1.15rem;
    transition: transform 0.3s ease;
  }

  .theme-toggle__icon--dark {
    display: none;
  }

  .theme-toggle[data-theme="dark"] .theme-toggle__icon--light {
    display: none;
  }

  .theme-toggle[data-theme="dark"] .theme-toggle__icon--dark {
    display: inline-block;
  }

  .theme-toggle[data-theme="light"] .theme-toggle__icon--light {
    display: inline-block;
  }

  .theme-toggle__label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
  }
</style>