import { getAttributeInfoFromFormat } from '../../../shared/geometry/utils/getAttributeInfoFromFormat.mjs';

"use strict";
const WGSL_TO_VERTEX_TYPES = {
  f32: "float32",
  "vec2<f32>": "float32x2",
  "vec3<f32>": "float32x3",
  "vec4<f32>": "float32x4",
  vec2f: "float32x2",
  vec3f: "float32x3",
  vec4f: "float32x4",
  i32: "sint32",
  "vec2<i32>": "sint32x2",
  "vec3<i32>": "sint32x3",
  "vec4<i32>": "sint32x4",
  u32: "uint32",
  "vec2<u32>": "uint32x2",
  "vec3<u32>": "uint32x3",
  "vec4<u32>": "uint32x4",
  bool: "uint32",
  "vec2<bool>": "uint32x2",
  "vec3<bool>": "uint32x3",
  "vec4<bool>": "uint32x4"
};
function extractAttributesFromGpuProgram({ source, entryPoint }) {
  const results = {};
  const mainVertStart = source.indexOf(`fn ${entryPoint}`);
  if (mainVertStart !== -1) {
    const arrowFunctionStart = source.indexOf("->", mainVertStart);
    if (arrowFunctionStart !== -1) {
      const functionArgsSubstring = source.substring(mainVertStart, arrowFunctionStart);
      const inputsRegex = /@location\((\d+)\)\s+([a-zA-Z0-9_]+)\s*:\s*([a-zA-Z0-9_<>]+)(?:,|\s|$)/g;
      let match;
      while ((match = inputsRegex.exec(functionArgsSubstring)) !== null) {
        const format = WGSL_TO_VERTEX_TYPES[match[3]] ?? "float32";
        results[match[2]] = {
          location: parseInt(match[1], 10),
          format,
          stride: getAttributeInfoFromFormat(format).stride,
          offset: 0,
          instance: false,
          start: 0
        };
      }
    }
  }
  return results;
}

export { extractAttributesFromGpuProgram };
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