import 'package:flutter/material.dart';

/// Design ADR-1: the named type scale, split out of [PluriWaveTokens] into
/// its own ThemeExtension so screens stop copy-pasting
/// `.copyWith(fontWeight: w900, letterSpacing: …)`. The set is closed at six
/// styles — a seventh requires amending ADR-1.
///
/// [eyebrowLabel] never applies `toUpperCase()` — casing is a
/// locale-hostile transform (Turkish dotless i, and scripts with no case at
/// all). The style carries weight/letter-spacing only; each ARB value is
/// authored in its own display form.
@immutable
class PluriWaveTypography extends ThemeExtension<PluriWaveTypography> {
  const PluriWaveTypography({
    required this.heroTime,
    required this.sectionTitle,
    required this.screenTitle,
    required this.cardTitle,
    required this.bodyStrong,
    required this.eyebrowLabel,
  });

  /// 88 / w800 / height 1.0 / ls -2.0. Alarm ringing, inline time editor.
  /// Every call site must wrap this in `FittedBox(fit: BoxFit.scaleDown)` —
  /// it renders at 176px under a 2.0 text scaler.
  final TextStyle heroTime;

  /// 23 / w800 / ls -0.6. Root screen section headings.
  final TextStyle sectionTitle;

  /// 19 / w800 / ls -0.4. PluriPushScaffold header title.
  final TextStyle screenTitle;

  /// 14.5 / w700. Station cards, settings rows, alarm cards.
  final TextStyle cardTitle;

  /// 13 / w600. Card subtitles, meta lines.
  final TextStyle bodyStrong;

  /// 11 / w800 / ls 0.8. "EN DIRECTO", "PROGRAMADOS", settings group
  /// headers.
  final TextStyle eyebrowLabel;

  /// Builds the scale from [family] — the SAME resolved Google Fonts
  /// TextTheme instance [PluriWaveTheme.dark] already computes. Building the
  /// styles anywhere else would re-merge the font family, which is the
  /// copy-paste this extension exists to eliminate.
  factory PluriWaveTypography.from(TextTheme family) {
    final fallback = family.bodyMedium ?? const TextStyle();
    TextStyle style(
      double fontSize,
      FontWeight fontWeight, {
      double? letterSpacing,
      double? height,
      Color? color,
    }) {
      return fallback.copyWith(
        fontSize: fontSize,
        fontWeight: fontWeight,
        letterSpacing: letterSpacing,
        height: height,
        color: color,
      );
    }

    return PluriWaveTypography(
      heroTime: style(88, FontWeight.w800, letterSpacing: -2.0, height: 1.0),
      sectionTitle: style(23, FontWeight.w800, letterSpacing: -0.6),
      screenTitle: style(19, FontWeight.w800, letterSpacing: -0.4),
      cardTitle: style(14.5, FontWeight.w700),
      bodyStrong: style(13, FontWeight.w600),
      // S9 (Tier 1 visual fidelity): the prototype's eyebrows are always
      // rgba(242,247,250,.42) (t4 lines 254, 299, 381, 450, 511, 660) — this
      // style used to carry no colour at all, so it rendered at whatever
      // full-opacity default the ambient text theme resolved to.
      eyebrowLabel: style(
        11,
        FontWeight.w800,
        letterSpacing: 0.8,
        color: const Color(0xFFF2F7FA).withValues(alpha: 0.42),
      ),
    );
  }

  @override
  PluriWaveTypography copyWith({
    TextStyle? heroTime,
    TextStyle? sectionTitle,
    TextStyle? screenTitle,
    TextStyle? cardTitle,
    TextStyle? bodyStrong,
    TextStyle? eyebrowLabel,
  }) {
    return PluriWaveTypography(
      heroTime: heroTime ?? this.heroTime,
      sectionTitle: sectionTitle ?? this.sectionTitle,
      screenTitle: screenTitle ?? this.screenTitle,
      cardTitle: cardTitle ?? this.cardTitle,
      bodyStrong: bodyStrong ?? this.bodyStrong,
      eyebrowLabel: eyebrowLabel ?? this.eyebrowLabel,
    );
  }

  @override
  PluriWaveTypography lerp(
    covariant ThemeExtension<PluriWaveTypography>? other,
    double t,
  ) {
    if (other is! PluriWaveTypography) return this;
    return PluriWaveTypography(
      heroTime: TextStyle.lerp(heroTime, other.heroTime, t) ?? heroTime,
      sectionTitle:
          TextStyle.lerp(sectionTitle, other.sectionTitle, t) ?? sectionTitle,
      screenTitle:
          TextStyle.lerp(screenTitle, other.screenTitle, t) ?? screenTitle,
      cardTitle: TextStyle.lerp(cardTitle, other.cardTitle, t) ?? cardTitle,
      bodyStrong: TextStyle.lerp(bodyStrong, other.bodyStrong, t) ?? bodyStrong,
      eyebrowLabel:
          TextStyle.lerp(eyebrowLabel, other.eyebrowLabel, t) ?? eyebrowLabel,
    );
  }
}