import 'package:flutter/cupertino.dart' show CupertinoPageTransitionsBuilder;
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:miler/views/helpers/constants/Colorconstants.dart';
import 'package:miler/views/helpers/constants/design_constants.dart';
import 'package:miler/views/helpers/constants/Font_constant.dart';

/// Centralized app theme (single source of truth for colors, type, and
/// component styling). Screens should lean on this instead of re-specifying
/// `ColorConstants.*` + `FontConstants.fontFamily` on every widget.
///
/// Everything below maps to the existing red/maroon brand via [ColorConstants]
/// — no colors changed, just consolidated and extended with component themes
/// (buttons, inputs, snackbars, sheets, dividers) so inline styling can be
/// retired incrementally.
class AppTheme {
  AppTheme._();

  static const Color _primary = ColorConstants.primary;

  /// The app's one theme.
  static ThemeData get light => _build();

  static ThemeData _build() => ThemeData(
    useMaterial3: true,
    brightness: Brightness.light,
    // The floor for page motion. Named routes and any route pushed without
    // going through `openScreen`/`openSheet` still slide horizontally with
    // the parallax and edge-swipe-back, instead of Android's default
    // fade-through zoom — which, on the mid-range phones riders carry,
    // reads as the new screen simply appearing.
    pageTransitionsTheme: const PageTransitionsTheme(
      builders: {
        TargetPlatform.android: CupertinoPageTransitionsBuilder(),
        TargetPlatform.iOS: CupertinoPageTransitionsBuilder(),
      },
    ),
    fontFamily: FontConstants.fontFamily,
    fontFamilyFallback: const ['Roboto', 'sans-serif'],
    textTheme: ThemeData.light().textTheme.apply(
      fontFamily: FontConstants.fontFamily,
    ),
    primaryTextTheme: ThemeData.light().primaryTextTheme.apply(
      fontFamily: FontConstants.fontFamily,
    ),
    colorScheme: const ColorScheme(
      brightness: Brightness.light,
      primary: ColorConstants.primary,
      onPrimary: ColorConstants.onPrimary,
      primaryContainer: ColorConstants.primaryContainer,
      onPrimaryContainer: ColorConstants.onPrimaryContainer,
      secondary: ColorConstants.secondary,
      onSecondary: ColorConstants.onSecondary,
      secondaryContainer: ColorConstants.secondaryContainer,
      onSecondaryContainer: ColorConstants.onSurface,
      tertiary: ColorConstants.tertiary,
      onTertiary: ColorConstants.onTertiary,
      tertiaryContainer: ColorConstants.tertiaryContainer,
      onTertiaryContainer: ColorConstants.onPrimary,
      error: ColorConstants.error,
      onError: ColorConstants.onError,
      errorContainer: ColorConstants.errorContainer,
      onErrorContainer: ColorConstants.onSurface,
      surface: ColorConstants.surface,
      onSurface: ColorConstants.onSurface,
      surfaceContainerHighest: ColorConstants.surfaceContainerHighest,
      outline: ColorConstants.outline,
      outlineVariant: ColorConstants.outlineVariant,
    ),
    appBarTheme: const AppBarTheme(
      backgroundColor: ColorConstants.pureSurface,
      elevation: 0,
      foregroundColor: ColorConstants.onSurface,
      systemOverlayStyle: SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: Brightness.dark,
        statusBarBrightness: Brightness.light,
      ),
    ),
    scaffoldBackgroundColor: ColorConstants.surface,
    progressIndicatorTheme: const ProgressIndicatorThemeData(
      color: _primary,
      linearTrackColor: ColorConstants.surfaceContainerHigh,
    ),
    dividerTheme: const DividerThemeData(
      color: ColorConstants.dividerColor,
      thickness: 1,
      space: 1,
    ),
    cardTheme: CardThemeData(
      color: Colors.white,
      surfaceTintColor: Colors.transparent,
      elevation: 0,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(DesignConstants.radiusXl),
        side: const BorderSide(color: ColorConstants.outlineVariant, width: 1),
      ),
    ),
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        backgroundColor: _primary,
        foregroundColor: Colors.white,
        disabledBackgroundColor: _primary.withValues(alpha: 0.35),
        disabledForegroundColor: Colors.white.withValues(alpha: 0.9),
        elevation: 0,
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 18),
        minimumSize: const Size(double.infinity, ButtonSizes.primary),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(ButtonSizes.radius),
        ),
        textStyle: const TextStyle(
          fontSize: 16,
          fontWeight: FontWeight.w700,
          fontFamily: FontConstants.fontFamily,
        ),
      ),
    ),
    outlinedButtonTheme: OutlinedButtonThemeData(
      style: OutlinedButton.styleFrom(
        foregroundColor: _primary,
        side: const BorderSide(color: _primary, width: 1.4),
        padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
        // ── Why this line exists ──
        //
        // `ElevatedButton` above pins its height to 56. `OutlinedButton`
        // used to pin nothing, so it fell back to Material's default 40dp
        // floor and sized itself from its own padding instead. That is
        // invisible until the two appear together — which is exactly where
        // they always appear, as the Cancel/Confirm pair of a dialog. Each
        // of those rows overrode padding on both buttons and assumed that
        // settled the height; it did not, because `styleFrom` only replaces
        // the keys you hand it. Cancel came out 44–49 and Confirm came out
        // 56, side by side, in three separate dialogs.
        //
        // Matching the height here means a plain `OutlinedButton` and a
        // plain `ElevatedButton` agree by default, and nobody has to know
        // about the merge order to get a straight row.
        //
        // Deliberately `64` wide and not `double.infinity`: outlined
        // buttons are the ones that share a row or hug their label, so
        // forcing full width would be wrong more often than right. A
        // button that must be shorter than 56 has to say so explicitly
        // with `minimumSize: Size.zero` — see [SecondaryButton].
        minimumSize: const Size(64, ButtonSizes.primary),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(ButtonSizes.radius),
        ),
        textStyle: const TextStyle(
          fontSize: 15,
          fontWeight: FontWeight.w700,
          fontFamily: FontConstants.fontFamily,
        ),
      ),
    ),
    textButtonTheme: TextButtonThemeData(
      style: TextButton.styleFrom(
        foregroundColor: _primary,
        textStyle: const TextStyle(
          fontWeight: FontWeight.w600,
          fontFamily: FontConstants.fontFamily,
        ),
      ),
    ),
    snackBarTheme: SnackBarThemeData(
      behavior: SnackBarBehavior.floating,
      backgroundColor: ColorConstants.onSurface,
      contentTextStyle: const TextStyle(
        color: Colors.white,
        fontFamily: FontConstants.fontFamily,
      ),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(DesignConstants.radiusLg),
      ),
    ),
    bottomSheetTheme: BottomSheetThemeData(
      backgroundColor: ColorConstants.pureSurface,
      surfaceTintColor: Colors.transparent,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
      ),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: ColorConstants.pureSurface,
      contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(DesignConstants.radiusXl),
        borderSide: const BorderSide(color: ColorConstants.outlineVariant),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(DesignConstants.radiusXl),
        borderSide: const BorderSide(color: ColorConstants.outlineVariant),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(DesignConstants.radiusXl),
        borderSide: const BorderSide(color: _primary, width: 2),
      ),
      labelStyle: const TextStyle(
        color: ColorConstants.onSurfaceVariant,
        fontFamily: FontConstants.fontFamily,
        fontSize: 14,
        fontWeight: FontWeight.w500,
      ),
    ),
  );
}