import { readFileSync } from 'node:fs';
import { Graphviz } from '@hpcc-js/wasm-graphviz';

const src = readFileSync(
  '/home/seb/src/dashdbschema/generate-schema-graph.js',
  'utf8'
);
const parser = src.slice(
  src.indexOf('function parseSchema'),
  src.indexOf('const EDGE_COLORS')
);
const edgeColorsConst = src.slice(
  src.indexOf('const EDGE_COLORS'),
  src.indexOf('function edgeKey')
);
const edgeKeyFn = src.slice(
  src.indexOf('function edgeKey'),
  src.indexOf('/**\n * Only a spanning forest')
);
const ranking = src.slice(
  src.indexOf('function selectRankingEdgeKeys'),
  src.indexOf('function assignEdgeColors')
);
const edgeColors = src.slice(
  src.indexOf('function assignEdgeColors'),
  src.indexOf('function escapeHtml')
);
const escape = src.slice(
  src.indexOf('function escapeHtml'),
  src.indexOf('/**\n * Domain grouping')
);
const clusters = src.slice(
  src.indexOf('const CLUSTERS'),
  src.indexOf('const COLORS =')
);
const colors = src.slice(
  src.indexOf('const COLORS ='),
  src.indexOf('const COLORS =') +
    src.slice(src.indexOf('const COLORS =')).indexOf('};') +
    2
);
const orderMembers = src.slice(
  src.indexOf('function orderClusterMembers'),
  src.indexOf('function buildTableLabel')
);
const plainPositions = src.slice(
  src.indexOf('function parsePlainPositions'),
  src.indexOf('function flipCompassLR')
);
const reorder = src.slice(
  src.indexOf('function reorderColumnsForCrossingReduction'),
  src.indexOf('function parsePlainPositions')
);
const builder = src.slice(
  src.indexOf('function buildTableLabel'),
  src.indexOf('function countSvgCrossings')
);
const crossingsFn = src.slice(
  src.indexOf('function countSvgCrossings'),
  src.indexOf('/**\n * Graphviz self-edges')
);
const mod = await import(
  'data:text/javascript,' +
    encodeURIComponent(
      parser +
        '\n' +
        edgeColorsConst +
        '\n' +
        clusters +
        '\n' +
        colors +
        '\n' +
        orderMembers +
        '\n' +
        plainPositions +
        '\n' +
        reorder +
        '\n' +
        edgeKeyFn +
        '\n' +
        ranking +
        '\n' +
        edgeColors +
        '\n' +
        escape +
        '\n' +
        builder +
        '\n' +
        crossingsFn +
        '\nexport { parseSchema, buildDot, assignEdgeAnchors, parsePlainPositions, reorderColumnsForCrossingReduction, orderClusterMembers, CLUSTERS, COLORS, countSvgCrossings };'
    )
);

const schemaSource = readFileSync(
  '/home/seb/src/dashdbschema/src/providers/mssql/schema.js',
  'utf8'
);
const { tables, edges } = mod.parseSchema(schemaSource);
const graphviz = await Graphviz.load();

let positions = null;
for (let pass = 0; pass < 3; pass++) {
  const probeDot = mod.buildDot(tables, edges, positions);
  const plain = graphviz.layout(probeDot, 'plain', 'dot');
  positions = mod.parsePlainPositions(plain);
  mod.reorderColumnsForCrossingReduction(tables, edges, positions);
}
const anchors = mod.assignEdgeAnchors(edges, positions);
const baseDot = mod.buildDot(tables, edges, positions, anchors);

const variants = [
  ['mclimit=4.0 splines=spline (current)', 'mclimit=4.0', 'splines=spline'],
  ['mclimit=1.0 splines=spline', 'mclimit=1.0', 'splines=spline'],
  ['mclimit=0.5 splines=spline', 'mclimit=0.5', 'splines=spline'],
  ['mclimit=1.0 splines=true', 'mclimit=1.0', 'splines=true'],
  ['mclimit=1.0 splines=polyline', 'mclimit=1.0', 'splines=polyline'],
];

for (const [label, mclimit, splines] of variants) {
  const dot = baseDot
    .replace('mclimit=4.0', mclimit)
    .replace('splines=spline', splines);
  const t = process.hrtime.bigint();
  const svg = graphviz.layout(dot, 'svg', 'dot');
  const ms = Number(process.hrtime.bigint() - t) / 1e6;
  const t2 = process.hrtime.bigint();
  const crossings = mod.countSvgCrossings(svg);
  const cms = Number(process.hrtime.bigint() - t2) / 1e6;
  console.log(
    `${label}: layout=${ms.toFixed(0)}ms crossings=${crossings} (count=${cms.toFixed(0)}ms) total=${(ms + cms).toFixed(0)}ms`
  );
}