import { Platform } from "react-native";

/**
 * Gishen design tokens.
 *
 * Brand lime is used as a *fill* with ink text (high contrast, distinctive).
 * `brandText` is the accessible green reserved for green-on-white text.
 */
const palette = {
  lime50: "#F6FAEC",
  lime100: "#ECF4D8",
  lime200: "#D9E9B2",
  lime300: "#C3DB86",
  lime400: "#A8C73A",
  lime500: "#93B22E",
  lime600: "#748E22",
  lime700: "#55681B",

  ink900: "#101410",
  ink700: "#2C332B",
  ink500: "#5B6157",
  ink300: "#8A9188",
  ink100: "#C3C8BE",

  paper: "#F7F8F5",
  white: "#FFFFFF",
  hairline: "#E9ECE2",
  wash: "#F1F3EC",

  red500: "#D64545",
  red50: "#FDF0F0",
  amber500: "#E0870F",
  amber50: "#FDF5E7",
  blue500: "#2F6FED",
  blue50: "#EEF3FE",
} as const;

export const colors = {
  brand: palette.lime400,
  brandDeep: palette.lime500,
  brandText: palette.lime600,
  brandSoft: palette.lime100,
  brandWash: palette.lime50,
  brandBorder: palette.lime200,

  ink: palette.ink900,
  inkDeep: palette.ink900,
  inkSecondary: palette.ink500,
  muted: palette.ink500,
  subtle: palette.ink300,
  disabled: palette.ink100,

  page: palette.paper,
  surface: palette.white,
  surfaceAlt: palette.wash,
  line: palette.hairline,

  danger: palette.red500,
  dangerSoft: palette.red50,
  warn: palette.amber500,
  warnSoft: palette.amber50,
  accent: palette.amber500,
  info: palette.blue500,
  infoSoft: palette.blue50,

  inStock: palette.lime600,
  outOfStock: palette.red500,
  star: "#F5A524",
} as const;

export const space = {
  xs: 4,
  sm: 8,
  md: 12,
  lg: 16,
  xl: 20,
  "2xl": 24,
  "3xl": 32,
  "4xl": 40,
} as const;

export const radii = {
  xs: 8,
  sm: 12,
  md: 16,
  lg: 20,
  xl: 24,
  card: 20,
  pill: 999,
} as const;

/** Screen gutter used by every page so content lines up across the app. */
export const gutter = 20;

export const fonts = {
  regular: "Jakarta_400Regular",
  medium: "Jakarta_500Medium",
  semibold: "Jakarta_600SemiBold",
  bold: "Jakarta_700Bold",
  extrabold: "Jakarta_800ExtraBold",
} as const;

export type TypeVariant =
  | "display"
  | "h1"
  | "h2"
  | "h3"
  | "body"
  | "bodyMedium"
  | "bodySm"
  | "label"
  | "caption"
  | "micro"
  | "price"
  | "priceLg";

export const typography: Record<
  TypeVariant,
  { fontFamily: string; fontSize: number; lineHeight: number; letterSpacing?: number }
> = {
  display: { fontFamily: fonts.extrabold, fontSize: 30, lineHeight: 36, letterSpacing: -0.6 },
  h1: { fontFamily: fonts.extrabold, fontSize: 24, lineHeight: 30, letterSpacing: -0.4 },
  h2: { fontFamily: fonts.bold, fontSize: 18, lineHeight: 24, letterSpacing: -0.2 },
  h3: { fontFamily: fonts.semibold, fontSize: 15, lineHeight: 20, letterSpacing: -0.1 },
  body: { fontFamily: fonts.regular, fontSize: 14, lineHeight: 21 },
  bodyMedium: { fontFamily: fonts.medium, fontSize: 14, lineHeight: 20 },
  bodySm: { fontFamily: fonts.regular, fontSize: 13, lineHeight: 19 },
  label: { fontFamily: fonts.semibold, fontSize: 13, lineHeight: 17 },
  caption: { fontFamily: fonts.medium, fontSize: 12, lineHeight: 16 },
  micro: { fontFamily: fonts.semibold, fontSize: 11, lineHeight: 14, letterSpacing: 0.2 },
  price: { fontFamily: fonts.bold, fontSize: 16, lineHeight: 21, letterSpacing: -0.2 },
  priceLg: { fontFamily: fonts.extrabold, fontSize: 24, lineHeight: 29, letterSpacing: -0.5 },
};

type Shadow = {
  shadowColor: string;
  shadowOpacity: number;
  shadowRadius: number;
  shadowOffset: { width: number; height: number };
  elevation: number;
};

const shadow = (opacity: number, radius: number, y: number, elevation: number): Shadow => ({
  shadowColor: "#16240A",
  shadowOpacity: Platform.OS === "android" ? opacity * 1.4 : opacity,
  shadowRadius: radius,
  shadowOffset: { width: 0, height: y },
  elevation,
});

export const shadows = {
  /** Resting cards. Nearly invisible, just lifts off the page. */
  xs: shadow(0.04, 6, 2, 1),
  sm: shadow(0.05, 10, 4, 2),
  /** Sheets, floating tab bar, sticky bars. */
  md: shadow(0.08, 18, 8, 8),
  lg: shadow(0.12, 28, 14, 16),
} as const;

/** Card recipe reused across screens so every surface matches. */
export const card = {
  backgroundColor: colors.surface,
  borderRadius: radii.card,
  borderWidth: 1,
  borderColor: colors.line,
} as const;

export const hitSlop = { top: 10, bottom: 10, left: 10, right: 10 } as const;