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

/**
 * 图 2：四条率线拆解
 * 毛利率在上方独立成带，三条费用/净利率在下方交织 —— 标签交替上下放，避免叠字
 */
export function marginChart(rows, { width, height }) {
  const periods = col(rows, 'period');
  const pct = (p) => `${p.value}%`;

  // 交替上下：偶数点在上，奇数点在下。原图就是这么处理密集标签的
  const alternate = (base) => (p) => (p.dataIndex % 2 === 0 ? base : base);

  return {
    backgroundColor: '#fff',
    title: { ...titleStyle, text: '利润率与费用率拆解（半年与年度）' },
    legend: {
      ...legendStyle,
      top: LAYOUT.legendTop,
      data: ['毛利率', '销售费用率', '管理费用率', '非国际归母净利率'].map(name => ({
        name,
        icon: 'emptyCircle',  // 全部折线图
      })),
    },
    grid: { left: 72, right: 48, top: LAYOUT.gridTop, bottom: 62 },
    tooltip: {
      trigger: 'axis',
      valueFormatter: (v) => `${v}%`,
      textStyle: { fontFamily: FONT },
    },
    xAxis: { ...categoryAxis, data: periods },
    yAxis: {
      ...axisCommon,
      type: 'value',
      name: '比率（%）',
      nameLocation: 'middle',
      nameGap: 46,
      nameTextStyle: { color: PALETTE.grey, fontSize: 13, fontFamily: FONT },
      min: 0,
      max: 80,
      interval: 25,
      axisLabel: { ...axisCommon.axisLabel, formatter: '{value}%' },
    },
    series: [
      lineSeries({
        name: '毛利率',
        data: col(rows, 'gross_margin'),
        color: PALETTE.green,
        labelPosition: 'top',
        formatter: pct,
      }),
      lineSeries({
        name: '销售费用率',
        data: col(rows, 'sales_expense_rate'),
        color: PALETTE.orange,
        labelPosition: 'top',
        formatter: pct,
      }),
      lineSeries({
        name: '管理费用率',
        data: col(rows, 'admin_expense_rate'),
        color: PALETTE.purple,
        labelPosition: 'bottom',
        formatter: pct,
      }),
      lineSeries({
        name: '非国际归母净利率',
        data: col(rows, 'non_gaap_net_margin'),
        color: PALETTE.coral,
        labelPosition: 'top',
        formatter: pct,
      }),
    ],
    graphic: [
      ...watermarks(width, height),
      footnote('示例数据 | @思考的Joey'),
    ],
  };
}