import 'package:flutter/material.dart';

class AppTheme {
  // ── WhatsApp Dark Palette ────────────────────────────────────────────────
  static const Color darkBackground   = Color(0xff111b21);
  static const Color darkSurface      = Color(0xff1f2c34);
  static const Color darkSurfaceLight = Color(0xff2a3942);
  static const Color darkOutgoingMsg  = Color(0xff005c4b);
  static const Color darkIncomingMsg  = Color(0xff1f2c34);
  static const Color darkTextPrimary  = Color(0xffe9edef);
  static const Color darkTextSecondary= Color(0xff8696a0);

  // ── WhatsApp Light Palette ───────────────────────────────────────────────
  static const Color lightBackground   = Color(0xffffffff);
  static const Color lightSurface      = Color(0xff075e54); // WhatsApp green header
  static const Color lightSurfaceLight = Color(0xfff0f2f5);
  static const Color lightOutgoingMsg  = Color(0xffd9fdd3);
  static const Color lightIncomingMsg  = Color(0xffffffff);
  static const Color lightTextPrimary  = Color(0xff111b21);
  static const Color lightTextSecondary= Color(0xff667781);
  static const Color lightChatBg      = Color(0xffe5ddd5); // WhatsApp chat wallpaper bg

  // ── Shared Colors ────────────────────────────────────────────────────────
  static const Color primary     = Color(0xff25d366); // WhatsApp green
  static const Color primaryDark = Color(0xff128c7e);
  static const Color teal        = Color(0xff075e54);
  static const Color blueTick    = Color(0xff53bdeb); // WhatsApp blue double tick
  static const Color greyTick    = Color(0xff667781);

  // ── Dark Theme ───────────────────────────────────────────────────────────
  static ThemeData get dark {
    return ThemeData(
      brightness: Brightness.dark,
      scaffoldBackgroundColor: darkBackground,
      primaryColor: teal,
      colorScheme: const ColorScheme.dark(
        primary: primary,
        secondary: primaryDark,
        surface: darkSurface,
        background: darkBackground,
      ),
      appBarTheme: const AppBarTheme(
        backgroundColor: darkSurface,
        foregroundColor: darkTextPrimary,
        elevation: 0,
        iconTheme: IconThemeData(color: darkTextSecondary),
        titleTextStyle: TextStyle(
          color: darkTextPrimary,
          fontSize: 20,
          fontWeight: FontWeight.bold,
        ),
      ),
      dividerColor: darkSurfaceLight,
      textSelectionTheme: const TextSelectionThemeData(
        cursorColor: primary,
        selectionColor: primaryDark,
        selectionHandleColor: primary,
      ),
    );
  }

  // ── Light Theme ──────────────────────────────────────────────────────────
  static ThemeData get light {
    return ThemeData(
      brightness: Brightness.light,
      scaffoldBackgroundColor: lightBackground,
      primaryColor: teal,
      colorScheme: const ColorScheme.light(
        primary: teal,
        secondary: primary,
        surface: lightSurface,
        background: lightBackground,
      ),
      appBarTheme: const AppBarTheme(
        backgroundColor: teal,
        foregroundColor: Colors.white,
        elevation: 0,
        iconTheme: IconThemeData(color: Colors.white),
        titleTextStyle: TextStyle(
          color: Colors.white,
          fontSize: 20,
          fontWeight: FontWeight.bold,
        ),
      ),
      dividerColor: Color(0xffe0e0e0),
      textSelectionTheme: const TextSelectionThemeData(
        cursorColor: teal,
        selectionColor: primary,
        selectionHandleColor: teal,
      ),
    );
  }

  // ── Context-aware helpers ─────────────────────────────────────────────────
  static bool isDark(BuildContext context) =>
      Theme.of(context).brightness == Brightness.dark;

  static Color background(BuildContext context) =>
      isDark(context) ? darkBackground : lightBackground;

  static Color surface(BuildContext context) =>
      isDark(context) ? darkSurface : lightSurface;

  static Color surfaceLight(BuildContext context) =>
      isDark(context) ? darkSurfaceLight : lightSurfaceLight;

  static Color outgoingMsg(BuildContext context) =>
      isDark(context) ? darkOutgoingMsg : lightOutgoingMsg;

  static Color incomingMsg(BuildContext context) =>
      isDark(context) ? darkIncomingMsg : lightIncomingMsg;

  static Color chatBackground(BuildContext context) =>
      isDark(context) ? darkBackground : lightChatBg;

  static Color textPrimary(BuildContext context) =>
      isDark(context) ? darkTextPrimary : lightTextPrimary;

  static Color textSecondary(BuildContext context) =>
      isDark(context) ? darkTextSecondary : lightTextSecondary;

  static Color iconColor(BuildContext context) =>
      isDark(context) ? darkTextSecondary : Colors.white;

  static Color subtitleIconColor(BuildContext context) =>
      isDark(context) ? darkTextSecondary : lightTextSecondary;
}