import { col } from '../csv.js';
import {
  PALETTE, FINANCIAL_COLORS, FONT, axisCommon, periodAxis, titleStyle, legendStyle,
  lineSeries, footnote, watermarks, LAYOUT,
} from '../theme.js';

/** 泡泡玛特营运资本效率：存货、应收、应付与现金转换周期。 */
const SERIES = [
  { key: 'inventory_days', name: '存货周转天数', color: FINANCIAL_COLORS.financingCashFlow, width: 2.4 },
  { key: 'receivable_days', name: '应收周转天数', color: FINANCIAL_COLORS.investingCashFlow, width: 2.2 },
  { key: 'payable_days', name: '应付周转天数', color: FINANCIAL_COLORS.cashConversion, width: 2.2 },
  { key: 'cash_conversion_cycle', name: '现金转换周期', color: FINANCIAL_COLORS.netCashIncrease, width: 3.2 },
];

/**
 * 同一期间的多条线将标签放到离最近相邻值更远的一侧，确保每个数值都可见。
 */
function labeledData(rows, key) {
  return rows.map((row) => {
    const value = row[key];
    const ranked = SERIES.map((series) => row[series.key]).sort((a, b) => b - a);
    const rank = ranked.indexOf(value);
    const gapUp = rank > 0 ? ranked[rank - 1] - value : Infinity;
    const gapDown = rank < ranked.length - 1 ? value - ranked[rank + 1] : Infinity;

    return {
      value,
      label: { position: gapUp >= gapDown ? 'top' : 'bottom', distance: 9 },
    };
  });
}

export function workingCapitalDaysChart(rows, { width, height }) {
  return {
    backgroundColor: '#fff',
    title: {
      ...titleStyle,
      text: '泡泡玛特营运资本效率',
      subtext: '现金转换周期 = 存货周转天数 + 应收周转天数 − 应付周转天数（中报按181天、年报按365天）',
    },
    legend: { ...legendStyle, top: LAYOUT.legendTop, data: SERIES.map((item) => item.name) },
    grid: { left: 78, right: 42, top: LAYOUT.gridTop, bottom: 90 },
    tooltip: {
      trigger: 'axis',
      textStyle: { fontFamily: FONT },
      valueFormatter: (value) => `${value.toFixed(1)} 天`,
    },
    xAxis: { ...periodAxis, data: col(rows, 'period') },
    yAxis: {
      ...axisCommon,
      type: 'value',
      name: '天数',
      nameLocation: 'middle',
      nameGap: 42,
      nameTextStyle: { color: PALETTE.grey, fontSize: 13, fontFamily: FONT },
      min: 0,
    },
    series: SERIES.map((item) => ({
      ...lineSeries({
        name: item.name,
        data: labeledData(rows, item.key),
        color: item.color,
        formatter: (p) => p.value.toFixed(0),
        width: item.width,
      }),
      label: {
        show: true,
        color: item.color,
        fontFamily: FONT,
        fontSize: 11,
        fontWeight: 500,
        formatter: (p) => `${p.value.toFixed(0)}天`,
        textBorderColor: '#fff',
        textBorderWidth: 3,
      },
      labelLayout: { hideOverlap: true },
      z: item.key === 'cash_conversion_cycle' ? 10 : 1,
    })),
    graphic: [
      ...watermarks(width, height),
      footnote('数据来源：泡泡玛特财务指标（合并报表）；原始180/360天口径已换算为181/365天 | @Joey知行记'),
    ],
  };
}