# All files / src/components/panels AppearancePanel.tsx

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     import type { JSX } from "react";
    import { THEMES } from "../../themes.js";
    import styles from "./SettingsPanel.module.scss";

    /** Props for the AppearancePanel component. */
    export interface AppearancePanelProps {
      /** The user's chosen theme ID. */
      themeId: string;
      /** The resolved data-theme value after system preference. */
      resolvedThemeId: string;
      /** Set a new theme by ID. */
      onSetTheme: (nextId: string) => void;
      /** Whether the theme follows the OS light/dark preference. */
      preferSystem: boolean;
      /** Toggle the OS preference behavior. */
      onSetPreferSystem: (prefer: boolean) => void;
    }

    /** Appearance settings panel with theme picker and system preference toggle. */
    export function AppearancePanel({
      themeId,
      resolvedThemeId,
      onSetTheme,
      preferSystem,
      onSetPreferSystem,
    }: AppearancePanelProps): JSX.Element {
      return (
        <section className={styles.section}>
          <h3 className={styles.sectionTitle}>Appearance</h3>
          <p className={styles.sectionDescription}>Choose how Grackle looks across the app.</p>
          <div className={styles.themeOptions}>
            {THEMES.filter((t) => !t.hidden).map((t) => {
              const hasVariants = !!(t.variantLightId && t.variantDarkId);
              const isSelected = hasVariants
                ? themeId === t.id || themeId === t.variantLightId || themeId === t.variantDarkId
                : themeId === t.id;
              const isLight = hasVariants && resolvedThemeId === t.variantLightId;
              return (
                <button
                  key={t.id}
                  type="button"
                  className={`${styles.themeOption} ${isSelected ? styles.themeOptionSelected : ""}`}
                  aria-pressed={isSelected}
                  onClick={() => onSetTheme(t.id)}
                >
                  <span className={styles.themeOptionHeader}>
                    <span>
                      <span className={styles.themeOptionLabel}>{t.label}</span>
                      <span className={styles.themeOptionDesc}>{t.description}</span>
                    </span>
                    {hasVariants && (
                      <span className={styles.variantToggle}>
                        <span
                          role="button"
                          tabIndex={0}
                          className={`${styles.variantButton} ${isSelected && isLight ? styles.variantActive : ""}`}
                          onClick={(e) => {
                            e.stopPropagation();
                            onSetPreferSystem(false);
                            onSetTheme(t.variantLightId!);
                          }}
                          onKeyDown={(e) => {
                            if (e.key === "Enter" || e.key === " ") {
                              e.preventDefault();
                              e.stopPropagation();
                              onSetPreferSystem(false);
                              onSetTheme(t.variantLightId!);
                            }
                          }}
                          aria-label="Light variant"
                          aria-pressed={isSelected && isLight}
                        >
                          &#9788;
                        </span>
                        <span
                          role="button"
                          tabIndex={0}
                          className={`${styles.variantButton} ${isSelected && !isLight ? styles.variantActive : ""}`}
                          onClick={(e) => {
                            e.stopPropagation();
                            onSetPreferSystem(false);
                            onSetTheme(t.variantDarkId!);
                          }}
                          onKeyDown={(e) => {
                            if (e.key === "Enter" || e.key === " ") {
                              e.preventDefault();
                              e.stopPropagation();
                              onSetPreferSystem(false);
                              onSetTheme(t.variantDarkId!);
                            }
                          }}
                          aria-label="Dark variant"
                          aria-pressed={isSelected && !isLight}
                        >
                          &#9790;
                        </span>
                      </span>
                    )}
                  </span>
                  {t.swatches && (
                    <span className={styles.themeSwatches}>
                      {t.swatches.map((color, i) => (
                        <span key={i} className={styles.themeSwatch} style={{ background: color }} />
                      ))}
                    </span>
                  )}
                </button>
              );
            })}
          </div>
          <label className={styles.systemToggle}>
            <input
              type="checkbox"
              checked={preferSystem}
              onChange={(e) => onSetPreferSystem(e.target.checked)}
            />
            <span>Match system light/dark preference</span>
          </label>
          <p className={styles.systemToggleHint}>
            Automatically switches between light and dark variants when available.
          </p>
          <p className={styles.themeActive}>
            Active theme: <strong>{resolvedThemeId}</strong>
          </p>
        </section>
      );
    }