import {
  MD3LightTheme,
  MD3DarkTheme,
  adaptNavigationTheme,
  ThemeOverride,
} from 'react-native-paper';
import type { MD3Theme } from 'react-native-paper';

import { lightOverrides, darkOverrides, antaramColors } from './colors';
import { spacing } from './spacing';

// ─── Light Theme ────────────────────────────────────────────────────────────────

export const lightTheme: MD3Theme = {
  ...MD3LightTheme,
  dark: false,
  roundness: 12,
  colors: {
    ...MD3LightTheme.colors,
    ...lightOverrides,
  },
};

// ─── Dark Theme ─────────────────────────────────────────────────────────────────

export const darkTheme: MD3Theme = {
  ...MD3DarkTheme,
  dark: true,
  roundness: 12,
  colors: {
    ...MD3DarkTheme.colors,
    ...darkOverrides,
  },
};

// ─── Navigation Themes ─────────────────────────────────────────────────────────
// Used with `@react-navigation/native` to keep the nav bar / header in sync
// with the Paper theme.

const { LightTheme: PaperNavLight, DarkTheme: PaperNavDark } =
  adaptNavigationTheme({
    reactNavigationLight: {
      colors: {
        background: lightTheme.colors.background,
        card: lightTheme.colors.surface,
        text: lightTheme.colors.onSurface,
        border: lightTheme.colors.outline,
        primary: lightTheme.colors.primary,
      },
    },
    reactNavigationDark: {
      colors: {
        background: darkTheme.colors.background,
        card: darkTheme.colors.surface,
        text: darkTheme.colors.onSurface,
        border: darkTheme.colors.outline,
        primary: darkTheme.colors.primary,
      },
    },
  });

/** Navigation theme for light mode */
export const LightNavTheme = PaperNavLight;

/** Navigation theme for dark mode */
export const DarkNavTheme = PaperNavDark;

// ─── Custom Theme Tokens ────────────────────────────────────────────────────────
// Shape tokens for consistent border-radius across the app.

export const customTheme = {
  /** Corner radius presets */
  shape: {
    shapeCornerNone: 0,
    shapeCornerExtraSmall: 4,
    shapeCornerSmall: 8,
    shapeCornerMedium: 12,
    shapeCornerLarge: 16,
    shapeCornerExtraLarge: 28,
    shapeCornerFull: 9999,
  },
  /** Re-export spacing for easy single-import access */
  spacing,
  /** Brand and status colors */
  colors: antaramColors,
} as const;

// ─── Helper ─────────────────────────────────────────────────────────────────────

/**
 * Returns the appropriate Paper theme based on a dark-mode flag.
 * Defaults to the light theme when the flag is falsy.
 */
export function getAppTheme(isDark: boolean): MD3Theme {
  return isDark ? darkTheme : lightTheme;
}

/**
 * Returns the appropriate navigation theme based on a dark-mode flag.
 */
export function getNavTheme(isDark: boolean) {
  return isDark ? DarkNavTheme : LightNavTheme;
}