import type { ReactNode } from 'react';
import { Link } from 'react-router';
import { Icon } from '../design/Icon';
import { useI18n } from '../i18n/useI18n';
import type { ExpenseEffect } from '../lib/effect';
import { formatMoney } from '../lib/money';
import styles from './LedgerRow.module.css';
import { Money } from './Money';

interface Common {
  /** Route to open (rendered as a link), or a click handler (rendered as a button); neither = static row. */
  to?: string;
  onClick?: () => void;
  /** Date text in the row meta ("16 okt.", SPEC §9.8). */
  date: string;
}

export type LedgerRowProps = Common &
  (
    | {
        kind: 'expense';
        /** The CategoryIcon tile (size 40, solid). */
        leading: ReactNode;
        description: string;
        amountOre: number;
        effect: ExpenseEffect;
      }
    | {
        kind: 'settlement';
        /** "Anna betalade dig 800,00 kr" (`ledger_settlement_*`), already formatted. */
        title: string;
        accountCount: number;
      }
  );

function EffectText({ effect }: { effect: ExpenseEffect }) {
  const { t, language } = useI18n();
  switch (effect.kind) {
    case 'lent':
      return <span className={styles.owed}>{t('effect_lent', formatMoney(effect.ore, language))}</span>;
    case 'borrowed':
      return <span className={styles.owing}>{t('effect_borrowed', formatMoney(effect.ore, language))}</span>;
    case 'not_involved':
      return <span className={styles.muted}>{t('effect_not_involved')}</span>;
    case 'paid_for_yourself':
      return <span className={styles.muted}>{t('effect_paid_for_yourself')}</span>;
  }
}

/**
 * design-spec §3.5 ledger rows (S-5, S-12, search): an expense (category tile, description, effect line, amount, date)
 * or a settlement (handshake tile on the settlement tint, title, "Betalning", date). Items of a SegmentedGroup.
 */
export function LedgerRow(props: LedgerRowProps) {
  const { t, tp } = useI18n();
  const content =
    props.kind === 'expense' ? (
      <>
        {props.leading}
        <span className={styles.centre}>
          <span className={styles.title}>{props.description}</span>
          <span className={styles.detail}>
            <EffectText effect={props.effect} />
          </span>
        </span>
        <span className={styles.end}>
          <Money ore={props.amountOre} amountStyle="small" />
          <span className={styles.meta}>{props.date}</span>
        </span>
      </>
    ) : (
      <>
        <span className={styles.settlementTile} aria-hidden="true">
          <Icon name="handshake" filled size={22} />
        </span>
        <span className={styles.centre}>
          <span className={styles.settlementTitle}>
            {props.title}
            {props.accountCount > 1
              ? `${t('common_separator_dot')}${tp('ledger_settlement_accounts', props.accountCount)}`
              : ''}
          </span>
          <span className={`${styles.detail} ${styles.muted}`}>{t('ledger_settlement_label')}</span>
        </span>
        <span className={styles.end}>
          <span className={styles.meta}>{props.date}</span>
        </span>
      </>
    );
  const className = [styles.row, props.kind === 'settlement' ? styles.settlement : undefined].filter(Boolean).join(' ');
  if (props.to !== undefined) {
    return (
      <Link to={props.to} className={`${className} ${styles.interactive}`}>
        {content}
      </Link>
    );
  }
  if (props.onClick !== undefined) {
    return (
      <button type="button" onClick={props.onClick} className={`${className} ${styles.interactive}`}>
        {content}
      </button>
    );
  }
  return <div className={className}>{content}</div>;
}

/** design-spec §3.5 `SegmentedGroup`: items 3 px apart, outer corners 24, inner 8, one card shadow. */
export function SegmentedGroup({ children, label }: { children: ReactNode; label?: string }) {
  return (
    <div className={styles.group} role="list" aria-label={label}>
      {children}
    </div>
  );
}

export function SegmentedItem({ children }: { children: ReactNode }) {
  return (
    <div role="listitem" className={styles.item}>
      {children}
    </div>
  );
}