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

/** 泡泡玛特渠道收入结构与增速。 */
const channels = [
  { key: 'retail', name: '零售店', color: CHANNEL_COLORS.retail },
  { key: 'online', name: '线上', color: CHANNEL_COLORS.online },
  { key: 'robot_store', name: '机器人商店', color: CHANNEL_COLORS.robotStore },
  { key: 'wholesale', name: '批发', color: CHANNEL_COLORS.wholesale },
];

// 段内标签文字色：浅色底（批发金）用深字，其余深色底用白字
const INSIDE_LABEL_COLORS = {
  retail: '#fff',
  online: '#fff',
  robot_store: '#fff',
  wholesale: PALETTE.ink,
};

const num = (value) => (Number.isFinite(value) ? value : null);

// 轴上限按数据最大值取整齐刻度，柱高比例确定后，段标签的段内/外置可按像素判断
const MIN_INSIDE_PX = 13; // 低于约 13px 的段放不下 10px 段内标签

export function channelRevenueChart(rows, { width, height, view = 'all' }) {
  const totalMax = Math.max(...rows.map((row) => num(row.total_revenue) || 0));
  const axisMax = niceAxisMax(totalMax);
  const yoyValues = col(rows, 'revenue_yoy').filter(Number.isFinite);
  // 全部／半年视图存在 2022H2 的负增长，右轴需包含负区间，避免折线被 0 轴裁切。
  const yoyMin = Math.min(0, Math.floor(Math.min(...yoyValues) / 50) * 50);
  const yoyMax = Math.max(50, Math.ceil(Math.max(...yoyValues) / 50) * 50);
  // 绘图区像素高：画布高 − grid top 145 − grid bottom 90
  const pxPerUnit = (height - LAYOUT.gridTop - 90) / axisMax;

  // 每根柱里放不下的矮段：标签外置到柱体右侧。同一柱内多个矮段标签
  // 自下而上保持 12px 间距；整根柱都是矮段时，纵向扇形以柱身中部为中心，
  // 避免标签整体飘离柱顶。返回 { 渠道序号: offset dy }（dy 为像素，正方向向下）。
  const fanOutsideLabels = (row) => {
    const values = channels.map((item) => num(row[item.key]));
    const centers = [];
    let cum = 0;
    values.forEach((value) => {
      centers.push((cum + value / 2) * pxPerUnit);
      cum += value;
    });
    const barTopPx = cum * pxPerUnit;
    const tinyIdx = channels
      .map((_, i) => i)
      .filter((i) => values[i] !== null && values[i] * pxPerUnit < MIN_INSIDE_PX);
    if (tinyIdx.length === 0) return {};
    const ys = tinyIdx.map((i) => centers[i]);
    for (let k = 1; k < ys.length; k += 1) {
      ys[k] = Math.max(ys[k], ys[k - 1] + 12);
    }
    if (tinyIdx.length === channels.length) {
      const shift = barTopPx / 2 - (ys[0] + ys[ys.length - 1]) / 2;
      for (let k = 0; k < ys.length; k += 1) ys[k] += shift;
      if (ys[0] < 2) {
        const lift = 2 - ys[0];
        for (let k = 0; k < ys.length; k += 1) ys[k] += lift;
      }
    }
    const offsets = {};
    tinyIdx.forEach((i, k) => {
      offsets[i] = centers[i] - ys[k];
    });
    return offsets;
  };

  const rowOffsets = rows.map(fanOutsideLabels);

  return {
    backgroundColor: '#fff',
    title: {
      ...titleStyle,
      text: `泡泡玛特渠道收入结构与增速（${financialViewLabel(view)}）`,
      subtext: ['渠道收入为堆叠柱，柱内及柱侧标注各渠道数值；折线为营业收入同比增速', financialViewDisclosure(view)].filter(Boolean).join('\n'),
    },
    legend: {
      ...legendStyle,
      top: LAYOUT.legendTop,
      data: [...channels.map((item) => item.name), '营业收入同比'],
    },
    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: '渠道收入（亿元）',
        nameLocation: 'middle',
        nameGap: 56,
        nameTextStyle: { color: PALETTE.grey, fontSize: 13, fontFamily: FONT },
        min: 0,
        max: axisMax,
        interval: axisMax % 4 === 0 ? axisMax / 4 : axisMax / 5,
      },
      {
        ...axisCommon,
        type: 'value',
        name: '营业收入同比（%）',
        nameLocation: 'middle',
        nameGap: 60,
        nameRotate: -90,
        nameTextStyle: { color: PALETTE.grey, fontSize: 13, fontFamily: FONT },
        min: yoyMin,
        max: yoyMax,
        interval: 50,
        axisLabel: { ...axisCommon.axisLabel, formatter: '{value}%' },
        splitLine: { show: false },
      },
    ],
    series: [
      ...channels.map((item, ci) => ({
        name: item.name,
        type: 'bar',
        stack: 'channel-revenue',
        data: rows.map((row, ri) => {
          const value = num(row[item.key]);
          if (value === null) return null;
          const inside = value * pxPerUnit >= MIN_INSIDE_PX;
          return {
            value,
            label: inside
              ? { position: 'inside', color: INSIDE_LABEL_COLORS[item.key] }
              : {
                  position: 'right',
                  color: PALETTE.ink,
                  distance: 3,
                  offset: [0, rowOffsets[ri][ci] || 0],
                  textBorderColor: '#fff',
                  textBorderWidth: 2,
                },
          };
        }),
        itemStyle: { color: item.color },
        label: {
          show: true,
          fontSize: 10,
          fontWeight: 500,
          fontFamily: FONT,
          formatter: (p) => Number(p.value).toFixed(1),
          overflow: 'none',
        },
        emphasis: { focus: 'series' },
      })),
      {
        ...lineSeries({
          name: '营业收入同比',
          data: col(rows, 'revenue_yoy'),
          color: CHANNEL_COLORS.revenueGrowth,
          formatter: (p) => `${p.value.toFixed(0)}%`,
          width: 3,
        }),
        yAxisIndex: 1,
        z: 10,
      },
    ],
    graphic: [
      ...watermarks(width, height),
      footnote('数据来源：泡泡玛特营收构成表；渠道口径按财报披露 | @Joey知行记'),
    ],
  };
}