import { readFileSync, writeFileSync, mkdirSync } from 'node:fs';
import { fileURLToPath } from 'node:url';

const source = new URL('../../server/docs/openapi/water-mini-v1.json', import.meta.url);
const schemas = JSON.parse(readFileSync(source, 'utf8')).components.schemas;
function type(schema = {}) {
  let result;
  if (schema.$ref) result = schema.$ref.split('/').pop();
  else if (schema.allOf) result = schema.allOf.map((item) => `(${type(item)})`).join(' & ');
  else if (schema.oneOf || schema.anyOf)
    result = (schema.oneOf || schema.anyOf).map(type).join(' | ');
  else if (schema.enum) result = schema.enum.map((value) => JSON.stringify(value)).join(' | ');
  else if (schema.type === 'array') result = `Array<${type(schema.items)}>`;
  else if (schema.type === 'object' || schema.properties) {
    result = schema.properties
      ? '{\n' +
        Object.entries(schema.properties)
          .map(
            ([key, value]) =>
              `  ${JSON.stringify(key)}${schema.required?.includes(key) ? '' : '?'}: ${type(value)};`,
          )
          .join('\n') +
        '\n}'
      : 'Record<string, unknown>';
  } else
    result =
      {
        integer: 'number',
        number: 'number',
        string: 'string',
        boolean: 'boolean',
      }[schema.type] || 'unknown';
  return schema.nullable ? `(${result}) | null` : result;
}
const output =
  '// Generated from server/docs/openapi/water-mini-v1.json. Run npm run api:types.\n\n' +
  Object.entries(schemas)
    .map(
      ([name, schema]) =>
        `export type ${name === 'Error' ? 'ApiErrorBody' : name} = ${type(schema)};`,
    )
    .join('\n\n') +
  '\n';
const target = new URL('../src/api/schema.ts', import.meta.url);
mkdirSync(fileURLToPath(new URL('../src/api/', import.meta.url)), {
  recursive: true,
});
writeFileSync(target, output);
console.log(`Generated ${Object.keys(schemas).length} API schema types.`);