import { col } from '../csv.js';
import {
  PALETTE, FONT, axisCommon, standalonePeriodAxis, titleStyle, legendStyle,
  financialViewDisclosure, financialViewLabel, niceAxisMax, stackedSharePoint,
  lineSeries, footnote, watermarks, LAYOUT,
} from '../theme.js';

/**
 * 混合正负堆叠的矮段标签外置偏移。
 * ECharts 对负值段自 0 向下堆叠，theme 的 fanTinyLabelOffsets 按全正累计
 * 算不出正确中心，这里按符号分两摞累计（屏幕坐标 y 向下为正），
 * 矮段（塞不进段内文字的）标签扇形排开在柱体右侧。
 */
function expenseFanOffsets(rows, keys, pxPerUnit, { minInsidePx = 15, gap = 13 } = {}) {
  return rows.map((row) => {
    let posCum = 0;
    let negCum = 0;
    const centers = {};
    keys.forEach((k) => {
      const v = Number.isFinite(row[k]) ? row[k] : 0;
      const mid = v >= 0 ? posCum + v / 2 : negCum + v / 2;
      centers[k] = -mid * pxPerUnit;
      if (v >= 0) posCum += v; else negCum += v;
    });
    const tiny = keys.filter((k) => Number.isFinite(row[k]) && row[k] !== 0
      && Math.abs(row[k]) * pxPerUnit < minInsidePx);
    if (!tiny.length) return {};
    const ys = tiny.map((k) => centers[k]);
    for (let i = 1; i < ys.length; i += 1) ys[i] = Math.max(ys[i], ys[i - 1] + gap);
    const offsets = {};
    tiny.forEach((k, i) => { offsets[k] = centers[k] - ys[i]; });
    return offsets;
  });
}

/** 泡泡玛特期间费用结构：观察销售投入、管理成本与费用率的规模效应。 */
export function expenseStructureChart(rows, { width, height, view = 'all' }) {
  const keys = ['sales_expense', 'admin_expense', 'financial_expense'];
  const posStackMax = Math.max(...rows.map((r) => keys.reduce((s, k) => s + Math.max(r[k] ?? 0, 0), 0)));
  const negMin = Math.min(...rows.map((r) => keys.reduce((s, k) => s + Math.min(r[k] ?? 0, 0), 0)));
  // 轴范围随数据走并取整刻度，保证矮段像素判定（pxPerUnit）有确定基准
  const axisMax = niceAxisMax(posStackMax);
  const axisMin = Math.min(0, Math.floor(negMin / 10) * 10);
  const pxPerUnit = (height - LAYOUT.gridTop - 90) / (axisMax - axisMin);
  const rowOffsets = expenseFanOffsets(rows, keys, pxPerUnit);

  return {
    backgroundColor: '#fff',
    title: {
      ...titleStyle,
      text: `泡泡玛特费用结构与费用率（${financialViewLabel(view)}）`,
      subtext: ['销售、管理、财务费用；折线为四项费用率', financialViewDisclosure(view)].filter(Boolean).join('\n'),
    },
    legend: {
      ...legendStyle,
      top: LAYOUT.legendTop,
      data: ['销售费用', '管理费用', '财务费用（净额）', '四项费用率'],
    },
    grid: { left: 78, right: 82, top: LAYOUT.gridTop, bottom: 90 },
    tooltip: {
      trigger: 'axis',
      axisPointer: { type: 'shadow' },
      textStyle: { fontFamily: FONT },
      valueFormatter: (value) => value.toFixed(1),
    },
    xAxis: { ...standalonePeriodAxis, data: col(rows, 'period') },
    yAxis: [
      {
        ...axisCommon,
        type: 'value',
        name: '金额（亿元）',
        nameLocation: 'middle',
        nameGap: 52,
        nameTextStyle: { color: PALETTE.grey, fontSize: 13, fontFamily: FONT },
        min: axisMin,
        max: axisMax,
        interval: 10,
      },
      {
        ...axisCommon,
        type: 'value',
        name: '四项费用率（%）',
        nameLocation: 'middle',
        nameGap: 58,
        nameRotate: -90,
        nameTextStyle: { color: PALETTE.grey, fontSize: 13, fontFamily: FONT },
        min: 0,
        max: 50,
        interval: 10,
        axisLabel: { ...axisCommon.axisLabel, formatter: '{value}%' },
        splitLine: { show: false },
      },
    ],
    series: [
      ...keys.map((key, ci) => ({
        name: { sales_expense: '销售费用', admin_expense: '管理费用', financial_expense: '财务费用（净额）' }[key],
        type: 'bar',
        stack: 'expenses',
        // 每段都标数值：矮段（含负值段）外置到柱体右侧，见 expenseFanOffsets
        data: rows.map((row, ri) => stackedSharePoint(row[key], {
          pxPerUnit,
          labelColor: '#fff',
          dy: rowOffsets[ri][key] ?? 0,
        })),
        itemStyle: { color: [PALETTE.orange, PALETTE.purple, PALETTE.blue][ci] },
        emphasis: { focus: 'series' },
        label: {
          show: true,
          position: 'inside',
          color: '#fff',
          fontSize: 11,
          fontFamily: FONT,
          fontWeight: 500,
          overflow: 'none',
          // 财务费用净额多在 ±0.1 亿内，一位小数会显示成 ±0.0，此时退到两位小数
          formatter: (p) => {
            const t = p.value.toFixed(1);
            if (t === '0.0' || t === '-0.0') return Math.abs(p.value) < 0.005 ? '0.0' : p.value.toFixed(2);
            return t;
          },
        },
      })),
      {
        ...lineSeries({
          name: '四项费用率',
          data: col(rows, 'four_expense_rate'),
          color: PALETTE.red,
          formatter: (p) => `${p.value.toFixed(1)}%`,
          width: 3,
        }),
        yAxisIndex: 1,
        z: 10,
      },
    ],
    graphic: [
      ...watermarks(width, height),
      footnote('数据来源：泡泡玛特合并利润表；H2为单独半年 | @Joey知行记'),
    ],
  };
}