import 'package:flutter/material.dart';

/// Design tokens. Every colour, radius, shadow and text style in the app comes
/// from here — screens never hardcode a value.
///
/// Direction (2026-09-15 rebuild, from the 14-screen design):
///
/// **Edges, not elevation.** Surfaces are separated by a 1px warm hairline and
/// a 10pt radius, not by a shadow. The only shadows left in the system are the
/// crimson glow under the one committing action on a screen, the float under a
/// control that genuinely hovers over a map, and the sheet lift. A screen that
/// drops shadows everywhere has no way left to say "this one matters".
///
/// **One accent, three intensities.** Crimson fills the header and the primary
/// action, washes (`brandSoft` over `brandLine`) carry supporting information,
/// and everything else is warm neutral. There is no second hue competing for
/// meaning — `ok` survives only for the delivered state, `danger` only for
/// destructive text.
///
/// **Manrope for voice, Geist Mono for data.** Headings run at w800 with tight
/// negative tracking; anything a customer might read back aloud or check
/// digit-by-digit — a booking reference, a phone number, a fare, a plate, a
/// countdown — is set in mono so the glyphs line up and a transposed character
/// is visible.
class DmColors {
  DmColors._();

  // ── Brand ────────────────────────────────────────────────────────────────
  /// The mark's single colour.
  static const brand = Color(0xFF8F0F06);

  /// Pressed state, and crimson text sitting on a [brandSoft] wash where the
  /// full brand would vibrate against the tint.
  static const brandPress = Color(0xFF730C05);
  static const brandDeep = brandPress;

  /// Tint behind selected options, wash cards and brand chips.
  static const brandSoft = Color(0xFFFBF3F2);

  /// The wash's own edge, and the outline on quiet brand buttons.
  static const brandLine = Color(0xFFF0DEDC);

  // ── Ink — warm neutrals, never pure black ────────────────────────────────
  static const ink = Color(0xFF191716);
  static const ink2 = Color(0xFF5C5654);
  static const ink3 = Color(0xFF6E6864);
  static const ink4 = Color(0xFFB4AEAA);

  // ── Surfaces ─────────────────────────────────────────────────────────────
  /// The page canvas.
  static const canvas = Color(0xFFF7F6F4);
  static const surface = Color(0xFFFFFFFF);

  /// Filled inputs, quiet chips, tiles, skeleton bases. Also the "sunken"
  /// treatment for a disabled primary action.
  static const surfaceAlt = Color(0xFFF1EFEC);

  /// Barely-there divider between rows inside one card.
  static const hairline = Color(0xFFF1EFEC);

  /// A card's own edge — the workhorse of this design.
  static const border = Color(0xFFE8E5E2);

  // ── On-brand text ────────────────────────────────────────────────────────
  /// Secondary text on a crimson field. Not white-at-opacity: a tinted rose
  /// keeps its warmth where translucent white goes grey and dirty.
  static const onBrand2 = Color(0xFFFFD9D4);

  /// Tertiary text on a crimson field.
  static const onBrand3 = Color(0xFFFFD1CB);

  /// Recessed track inside the header (the segmented control's bed).
  static const onBrandSunken = Color(0x24000000);

  /// A control resting on the crimson field.
  static const onBrandRaise = Color(0x2EFFFFFF);

  // ── Semantic ─────────────────────────────────────────────────────────────
  static const ok = Color(0xFF0A6B56);
  static const okSoft = Color(0xFFE2F4EF);
  static const danger = Color(0xFFB3231F);

  /// "You are here" on a map. Deliberately not the brand crimson — on a map
  /// crimson means the pickup pin, and blue is the convention every customer
  /// already reads as their own position.
  static const locationDot = Color(0xFF1B6EF3);
  static const locationHalo = Color(0x241B6EF3);

  static const scrim = Color(0x80191716);

  // Backwards-compatible aliases used across the widget layer.
  static const bg = canvas;
  static const surface2 = surfaceAlt;
  static const line = hairline;
  static const lineStrong = border;
}

class DmRadius {
  DmRadius._();

  /// Tiles, chips, the small square that holds a glyph.
  static const xs = 8.0;

  /// Buttons, fields, icon buttons. The design's most-used corner.
  static const sm = 9.0;

  /// Cards and every panel that holds rows.
  static const md = 10.0;

  /// Sheets' grabber area, the segmented control, the header's bottom sweep.
  static const lg = 12.0;

  /// Bottom sheets and the auth sheet that overlaps the hero.
  static const xl = 16.0;

  /// The brand header's bottom corners.
  static const header = 18.0;

  static const pill = 999.0;

  /// Kept for call sites that mean "a primary bar's corner".
  static const book = sm;

  static BorderRadius all(double r) => BorderRadius.circular(r);
}

class DmSpace {
  DmSpace._();

  /// Horizontal page padding. 22 on the brand header's body, 24 on canvas
  /// content — the header's crimson field reads as tighter than it measures,
  /// so it takes the smaller inset.
  static const pad = 24.0;
  static const headerPad = 22.0;

  /// Minimum touch target.
  static const tap = 48.0;

  /// Primary button height.
  static const button = 54.0;

  /// Field height — matched to [button] so a form and its action share a rhythm.
  static const field = 54.0;
}

class DmShadow {
  DmShadow._();

  /// Under the one committing action on a screen, and under a selected slot.
  static const lift = [
    BoxShadow(
      color: Color(0x808F0F06),
      blurRadius: 24,
      spreadRadius: -12,
      offset: Offset(0, 10),
    ),
  ];

  /// A smaller version of [lift] for chips and half-width controls.
  static const liftSm = [
    BoxShadow(
      color: Color(0xA68F0F06),
      blurRadius: 16,
      spreadRadius: -8,
      offset: Offset(0, 7),
    ),
  ];

  /// Controls that genuinely float over content — map buttons, map chips.
  static const float = [
    BoxShadow(
      color: Color(0x0D191716),
      blurRadius: 2,
      offset: Offset(0, 1),
    ),
  ];

  static const sheet = [
    BoxShadow(
      color: Color(0x2E191716),
      blurRadius: 40,
      spreadRadius: -20,
      offset: Offset(0, -8),
    ),
  ];

  // Aliases kept for existing call sites.
  static const two = float;
  static const three = sheet;
}

class DmMotion {
  DmMotion._();
  static const fast = Duration(milliseconds: 140);
  static const base = Duration(milliseconds: 250);
  static const slow = Duration(milliseconds: 460);
  static const ease = Curves.easeOutCubic;

  /// The bottom nav's travelling pill — a touch of overshoot, which reads as
  /// the indicator catching up rather than teleporting.
  static const glide = Cubic(0.34, 1.06, 0.36, 1);
}

/// Manrope for voice, Geist Mono for data.
///
/// Both ship as single variable-font files, which is why every style below sets
/// `fontVariations` as well as `fontWeight` — see the note inside the class.
class DmText {
  DmText._();

  static const _f = 'Manrope';
  static const _mono = 'GeistMono';

  // The weight axis. Manrope and Geist Mono both ship as variable fonts, so a
  // style has to move `wght` to change weight — `fontWeight` alone picks the
  // nearest named instance and, on a single-file VF, that is always the
  // default. Both are set on every style: the axis does the work, the enum
  // keeps the semantics (and the system-font fallback) correct.
  static const _w500 = [FontVariation('wght', 500)];
  static const _w600 = [FontVariation('wght', 600)];
  static const _w700 = [FontVariation('wght', 700)];
  static const _w800 = [FontVariation('wght', 800)];

  // Letter spacing is quoted in em by the design and converted here at each
  // size, because -0.035em is a different number of pixels on a 31pt display
  // head than on a 15pt row title, and splitting the difference would soften
  // exactly the heads that are supposed to feel tight.

  // ── Display ──────────────────────────────────────────────────────────────

  /// Screen-dominating statement — "Pickup booked", "Arun is 12 minutes away".
  static const display = TextStyle(
    fontFamily: _f, fontSize: 31, height: 1.12,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: -1.09, color: DmColors.ink,
  );

  /// The brand header's own title, sitting on crimson.
  static const headerTitle = TextStyle(
    fontFamily: _f, fontSize: 34, height: 1.0,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: -1.36, color: Colors.white,
  );

  /// Screen headings on a canvas.
  static const title = TextStyle(
    fontFamily: _f, fontSize: 25, height: 1.18,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: -0.75, color: DmColors.ink,
  );

  /// Tab-root page titles where no brand header is used.
  static const pageTitle = title;

  /// The heading above a group of cards, and a sheet's own title.
  static const heading = TextStyle(
    fontFamily: _f, fontSize: 18, height: 1.25,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: -0.45, color: DmColors.ink,
  );

  static const sheetTitle = TextStyle(
    fontFamily: _f, fontSize: 19, height: 1.2,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: -0.57, color: DmColors.ink,
  );

  // ── Rows ─────────────────────────────────────────────────────────────────

  /// A row's own line — `t1` in the design, and the workhorse of the app.
  static const cardTitle = TextStyle(
    fontFamily: _f, fontSize: 15, height: 1.4,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: -0.18, color: DmColors.ink,
  );

  /// Alias: the same weight of statement, used mid-form.
  static const bodyStrong = cardTitle;

  static const body = TextStyle(
    fontFamily: _f, fontSize: 15, height: 1.5,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    letterSpacing: -0.12, color: DmColors.ink,
  );

  /// Supporting line under a row title — `t2`.
  static const small = TextStyle(
    fontFamily: _f, fontSize: 13.5, height: 1.45,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    color: DmColors.ink2,
  );

  /// The quietest line — `t3`. Timestamps, counts, "collected on".
  static const tiny = TextStyle(
    fontFamily: _f, fontSize: 13, height: 1.4,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    color: DmColors.ink3,
  );

  /// Paragraph under a screen heading.
  static const lede = TextStyle(
    fontFamily: _f, fontSize: 14.5, height: 1.55,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    color: DmColors.ink2,
  );

  /// The right-hand value in a settings row.
  static const value = TextStyle(
    fontFamily: _f, fontSize: 13.5, height: 1.4,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    color: DmColors.ink2,
  );

  /// Field labels, tags, chips, inline actions.
  static const label = TextStyle(
    fontFamily: _f, fontSize: 12.5, height: 1.3,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    color: DmColors.ink2,
  );

  static const button = TextStyle(
    fontFamily: _f, fontSize: 15.5, height: 1.2,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: -0.23,
  );

  /// The text-only action under a primary button ("Back to home").
  static const textButton = TextStyle(
    fontFamily: _f, fontSize: 14.5, height: 1.2,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    color: DmColors.ink2,
  );

  /// Uppercase micro-label above a group — the design's `micro`. Crimson when
  /// it heads brand content, [DmColors.ink3] when it heads a neutral group.
  static const eyebrow = TextStyle(
    fontFamily: _f, fontSize: 10.5, height: 1.3,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: 1.16, color: DmColors.ink3,
  );

  /// The eyebrow as it appears on the crimson header.
  static const headerEyebrow = TextStyle(
    fontFamily: _f, fontSize: 11.5, height: 1.3,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: 1.84, color: DmColors.onBrand3,
  );

  /// Sentence-case heading above a group of rows.
  static const sectionHead = TextStyle(
    fontFamily: _f, fontSize: 15, height: 1.3,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: -0.3, color: DmColors.ink,
  );

  /// Alias kept for existing call sites.
  static const groupHead = sectionHead;

  /// Field input text.
  static const field = TextStyle(
    fontFamily: _f, fontSize: 16, height: 1.3,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    color: DmColors.ink,
  );

  // ── Mono: anything checkable digit by digit ──────────────────────────────

  /// References, plates and phone numbers sitting inline in a row.
  static const mono = TextStyle(
    fontFamily: _mono, fontSize: 13, height: 1.4,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    letterSpacing: -0.26, color: DmColors.ink3,
  );

  /// Step counters, timers, the smallest data.
  static const monoSm = TextStyle(
    fontFamily: _mono, fontSize: 11.5, height: 1.3,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    letterSpacing: -0.23, color: DmColors.ink3,
  );

  /// A booking reference given its own line, or a fare.
  static const monoLg = TextStyle(
    fontFamily: _mono, fontSize: 19, height: 1.2,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    letterSpacing: -0.38, color: DmColors.ink,
  );

  /// The OTP digits.
  static const otp = TextStyle(
    fontFamily: _f, fontSize: 24, height: 1.1,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    color: DmColors.ink,
  );
}