import 'package:flutter/material.dart';

import '../../core/theme/chart_colors.dart';

/// Russian labels for the stable keys the income routes send.

const incomeKindLabels = {
  'dividend': 'Дивиденд',
  'coupon': 'Купон',
  'amortization': 'Амортизация',
  'repayment': 'Погашение',
};

String incomeKindLabel(String kind) => incomeKindLabels[kind] ?? kind;

/// One glyph per kind, so a day cell on the calendar says what is paid without a word. The
/// colour of the glyph is left to the caller: on the calendar it is the basis, not the kind.
IconData incomeKindIcon(String kind) => switch (kind) {
  'dividend' => Icons.paid_outlined,
  'coupon' => Icons.receipt_long_outlined,
  'amortization' => Icons.trending_down,
  'repayment' => Icons.flag_outlined,
  _ => Icons.circle_outlined,
};

const basisLabels = {
  'schedule': 'по графику',
  'announced': 'объявлено',
  'history': 'по истории',
  'paid': 'выплачено',
};

/// What each basis actually promises. Shown as a tooltip and spelled out in the legend,
/// because the difference between «объявлено» and «по истории» is the difference between a
/// fact and a guess.
const basisDescriptions = {
  'schedule': 'Арифметика по опубликованному графику выплат эмитента.',
  'announced': 'Объявленный эмитентом факт: размер и дата известны.',
  'history':
      'Экстраполяция по выплатам за последние 24 мес — может ошибаться '
      'на любую величину, в том числе выплаты может не быть вовсе.',
  'paid': 'Уже получено.',
};

String basisLabel(String basis) => basisLabels[basis] ?? basis;

String basisDescription(String basis) => basisDescriptions[basis] ?? basis;

/// Fixed slot per basis — never cycled, so the same basis is the same colour on the
/// calendar, in the forecast legend and in the stacked bars.
Color basisColor(String basis) => switch (basis) {
  'schedule' => ChartColors.slot1Blue,
  'announced' => ChartColors.slot3Aqua,
  'history' => ChartColors.slot4Yellow,
  'paid' => ChartColors.slot5Magenta,
  _ => ChartColors.slot2Orange,
};

/// The basis chip that has to sit on every calendar and forecast row.
class BasisChip extends StatelessWidget {
  const BasisChip({required this.basis, super.key, this.dense = true});

  final String basis;
  final bool dense;

  @override
  Widget build(BuildContext context) {
    final color = basisColor(basis);
    return Tooltip(
      message: basisDescription(basis),
      child: Container(
        padding: EdgeInsets.symmetric(
          horizontal: dense ? 6 : 10,
          vertical: dense ? 1 : 4,
        ),
        decoration: BoxDecoration(
          color: color.withValues(alpha: 0.14),
          border: Border.all(color: color.withValues(alpha: 0.5)),
          borderRadius: BorderRadius.circular(6),
        ),
        child: Text(
          basisLabel(basis),
          style: Theme.of(context).textTheme.labelSmall?.copyWith(color: color),
        ),
      ),
    );
  }
}