inline-schema/src/csv-loader/loader.ts

import { parse } from 'csv-parse/sync';
import { parseSchema, createValidator, parseValue } from '../index.js';
import type { Schema, ReferenceSchema } from '../types.js';
import * as fs from 'fs';
import * as path from 'path';

function hasNestedReferences(schema: Schema): boolean {
  switch (schema.type) {
    case 'reference':
      return true;
    case 'tuple':
      return schema.elements.some(el => hasNestedReferences(el.schema));
    case 'array':
      return hasNestedReferences(schema.element);
    case 'union':
      return schema.members.some(m => hasNestedReferences(m));
    default:
      return false;
  }
}

function loadReferenceTable(
  schema: ReferenceSchema,
  refBaseDir: string | undefined,
  defaultPrimaryKey: string,
  currentFilePath: string | undefined
): { lookup: Map<string, Record<string, unknown>>; refTable: Record<string, unknown>[] } {
  const baseDir = refBaseDir || (currentFilePath ? path.dirname(currentFilePath) : process.cwd());
  const fileName = `${schema.tableName}.csv`;
  const refFilePath = path.isAbsolute(fileName)
    ? fileName
    : path.join(baseDir, fileName);

  let refTable: Record<string, unknown>[];
  if (referenceTableCache.has(refFilePath)) {
    refTable = referenceTableCache.get(refFilePath)!;
  } else {
    if (loadingFiles.has(refFilePath)) {
      throw new Error(
        `Circular reference detected: table "${schema.tableName}" (${refFilePath}) is already being loaded`
      );
    }
    loadingFiles.add(refFilePath);
    try {
      const refContent = fs.readFileSync(refFilePath, 'utf-8');
      const refResult = parseCsv(refContent, {
        currentFilePath: refFilePath,
        emitTypes: false,
      });
      refTable = refResult.data;
      referenceTableCache.set(refFilePath, refTable);
    } catch (error) {
      throw new Error(
        `Failed to load referenced table "${schema.tableName}" from ${refFilePath}: ${error instanceof Error ? error.message : String(error)}`
      );
    } finally {
      loadingFiles.delete(refFilePath);
    }
  }

  const lookup = new Map<string, Record<string, unknown>>();
  refTable.forEach(row => {
    const pkValue = row[defaultPrimaryKey];
    if (pkValue !== undefined) {
      lookup.set(String(pkValue), row);
    }
  });

  return { lookup, refTable };
}

function resolveReferenceId(
  id: string,
  lookup: Map<string, Record<string, unknown>>,
  tableName: string
): Record<string, unknown> {
  const obj = lookup.get(id);
  if (!obj) {
    throw new Error(`Reference to "${tableName}" with id="${id}" not found`);
  }
  return obj;
}

function parseReferenceIds(schema: ReferenceSchema, valueString: string): unknown {
  const trimmed = valueString.trim();
  if (schema.isOptional && trimmed === '') {
    return null;
  }
  const valueParser = new ReferenceValueParser(trimmed);
  const ids = valueParser.parseIds(schema.isArray);
  if (schema.isArray) {
    return ids;
  }
  return ids[0];
}

function parseValueWithReferenceIds(
  valueString: string,
  schema: Schema
): unknown {
  if (!hasNestedReferences(schema)) {
    return parseValue(schema, valueString);
  }

  switch (schema.type) {
    case 'reference':
      return parseReferenceIds(schema, valueString);
    case 'tuple': {
      const parsed = parseValue(schema, valueString) as unknown[];
      return schema.elements.map((el, i) =>
        hasNestedReferences(el.schema)
          ? extractNestedReferenceIds(parsed[i], el.schema)
          : parsed[i]
      );
    }
    case 'array': {
      const parsed = parseValue(schema, valueString) as unknown[];
      return parsed.map(item =>
        hasNestedReferences(schema.element)
          ? extractNestedReferenceIds(item, schema.element)
          : item
      );
    }
    case 'union': {
      for (const member of schema.members) {
        if (hasNestedReferences(member)) {
          try {
            const parsed = parseValue(member, valueString);
            return extractNestedReferenceIds(parsed, member);
          } catch {}
        }
      }
      return parseValue(schema, valueString);
    }
    default:
      return parseValue(schema, valueString);
  }
}

function extractNestedReferenceIds(value: unknown, schema: Schema): unknown {
  switch (schema.type) {
    case 'reference':
      if (value === null || value === undefined) return value;
      if (schema.isArray) {
        const ids = Array.isArray(value) ? value : [value];
        return ids.map(id => String(id));
      }
      return String(value);
    case 'tuple': {
      if (!Array.isArray(value)) return value;
      return schema.elements.map((el, i) =>
        hasNestedReferences(el.schema)
          ? extractNestedReferenceIds(value[i], el.schema)
          : value[i]
      );
    }
    case 'array': {
      if (!Array.isArray(value)) return value;
      return value.map(item =>
        hasNestedReferences(schema.element)
          ? extractNestedReferenceIds(item, schema.element)
          : item
      );
    }
    case 'union': {
      for (const member of schema.members) {
        if (hasNestedReferences(member)) {
          try {
            return extractNestedReferenceIds(value, member);
          } catch {}
        }
      }
      return value;
    }
    default:
      return value;
  }
}

function collectReferenceFields(schema: Schema, name: string): ReferenceFieldInfo[] {
  const fields: ReferenceFieldInfo[] = [];
  switch (schema.type) {
    case 'reference':
      fields.push({ name, tableName: schema.tableName, isArray: schema.isArray, schema });
      break;
    case 'tuple':
      for (const el of schema.elements) {
        fields.push(...collectReferenceFields(el.schema, name));
      }
      break;
    case 'array':
      fields.push(...collectReferenceFields(schema.element, name));
      break;
    case 'union':
      for (const member of schema.members) {
        fields.push(...collectReferenceFields(member, name));
      }
      break;
  }
  return fields;
}

function parseValueWithReferences(
  valueString: string,
  schema: Schema,
  refBaseDir: string | undefined,
  defaultPrimaryKey: string,
  currentFilePath: string | undefined
): unknown {
  if (!hasNestedReferences(schema)) {
    return parseValue(schema, valueString);
  }

  switch (schema.type) {
    case 'reference':
      return parseReferenceValue(schema, valueString, refBaseDir, defaultPrimaryKey, currentFilePath);
    case 'tuple': {
      const parsed = parseValue(schema, valueString) as unknown[];
      return schema.elements.map((el, i) =>
        resolveNestedReferences(parsed[i], el.schema, refBaseDir, defaultPrimaryKey, currentFilePath)
      );
    }
    case 'array': {
      const parsed = parseValue(schema, valueString) as unknown[];
      return parsed.map(item =>
        resolveNestedReferences(item, schema.element, refBaseDir, defaultPrimaryKey, currentFilePath)
      );
    }
    case 'union': {
      const errors: Error[] = [];
      for (const member of schema.members) {
        if (hasNestedReferences(member)) {
          try {
            const parsed = parseValue(member, valueString);
            return resolveNestedReferences(parsed, member, refBaseDir, defaultPrimaryKey, currentFilePath);
          } catch (e) {
            errors.push(e instanceof Error ? e : new Error(String(e)));
          }
        }
      }
      if (errors.length > 0 && errors.every(e => /not found|Circular reference|Failed to load/.test(e.message))) {
        for (const member of schema.members) {
          if (!hasNestedReferences(member)) {
            try {
              return parseValue(member, valueString);
            } catch {}
          }
        }
      }
      return parseValue(schema, valueString);
    }
    default:
      return parseValue(schema, valueString);
  }
}

function resolveNestedReferences(
  value: unknown,
  schema: Schema,
  refBaseDir: string | undefined,
  defaultPrimaryKey: string,
  currentFilePath: string | undefined
): unknown {
  switch (schema.type) {
    case 'reference': {
      if (value === null || value === undefined) return value;
      const { lookup } = loadReferenceTable(schema, refBaseDir, defaultPrimaryKey, currentFilePath);
      if (schema.isArray) {
        const ids = Array.isArray(value) ? value : [value];
        return ids.map(id => resolveReferenceId(String(id), lookup, schema.tableName));
      }
      return resolveReferenceId(String(value), lookup, schema.tableName);
    }
    case 'tuple': {
      if (!Array.isArray(value)) return value;
      return schema.elements.map((el, i) =>
        resolveNestedReferences(value[i], el.schema, refBaseDir, defaultPrimaryKey, currentFilePath)
      );
    }
    case 'array': {
      if (!Array.isArray(value)) return value;
      return value.map(item =>
        resolveNestedReferences(item, schema.element, refBaseDir, defaultPrimaryKey, currentFilePath)
      );
    }
    case 'union': {
      const errors: Error[] = [];
      for (const member of schema.members) {
        if (hasNestedReferences(member)) {
          try {
            return resolveNestedReferences(value, member, refBaseDir, defaultPrimaryKey, currentFilePath);
          } catch (e) {
            errors.push(e instanceof Error ? e : new Error(String(e)));
          }
        }
      }
      if (errors.length > 0) {
        throw errors[0];
      }
      return value;
    }
    default:
      return value;
  }
}

export interface CsvLoaderOptions {
  delimiter?: string;
  quote?: string;
  escape?: string;
  bom?: boolean;
  comment?: string | false;
  trim?: boolean;
  /** Generate TypeScript declaration file (.d.ts) */
  emitTypes?: boolean;
  /** Output directory for generated type files (relative to output path) */
  typesOutputDir?: string;
  /** Write .d.ts files to disk (useful for dev server) */
  writeToDisk?: boolean;
  /** Base directory for resolving referenced CSV files (default: directory of current file) */
  refBaseDir?: string;
  /** Primary key field name for referenced tables (default: 'id') */
  defaultPrimaryKey?: string;
  /** Current file path (used to resolve relative references) */
  currentFilePath?: string;
  /**
   * When false, reference fields store parsed IDs instead of resolved objects.
   * Used by csvToModule to emit accessor-based code with lazy resolution.
   * Default: true (resolves references eagerly by loading referenced CSV files).
   */
  resolveReferences?: boolean;
}

export interface ReferenceFieldInfo {
  /** Column name in the CSV */
  name: string;
  /** Referenced table name */
  tableName: string;
  /** Whether it's an array reference */
  isArray: boolean;
  /** The schema of this field (for nested references) */
  schema: Schema;
}

export interface CsvParseResult {
  /** Parsed CSV data as array of objects */
  data: Record<string, unknown>[];
  /** Generated TypeScript type definition string (if emitTypes is true) */
  typeDefinition?: string;
  /** Property configurations for the CSV columns */
  propertyConfigs: PropertyConfig[];
  /** Referenced table names */
  references: Set<string>;
  /** Reference field metadata (populated when resolveReferences is false) */
  referenceFields: ReferenceFieldInfo[];
}

interface PropertyConfig {
  name: string;
  schema: any;
  validator: (value: unknown) => boolean;
  parser: (valueString: string) => unknown;
  /** Whether this property is a reference to another table */
  isReference?: boolean;
  /** Referenced table name (if isReference is true) */
  referenceTableName?: string;
  /** Whether it's an array reference */
  referenceIsArray?: boolean;
}

/** Cache for loaded referenced tables */
const referenceTableCache = new Map<string, Record<string,unknown>[]>();

/** Set of file paths currently being loaded (to detect circular references) */
const loadingFiles = new Set<string>();

/**
 * Parse and resolve a reference value.
 * Loads the referenced table and replaces IDs with actual objects.
 */
function parseReferenceValue(
  schema: ReferenceSchema,
  valueString: string,
  refBaseDir: string | undefined,
  defaultPrimaryKey: string,
  currentFilePath: string | undefined
): unknown {
  const trimmed = valueString.trim();
  if (schema.isOptional && trimmed === '') {
    return null;
  }

  const { lookup } = loadReferenceTable(schema, refBaseDir, defaultPrimaryKey, currentFilePath);
  
  const valueParser = new ReferenceValueParser(trimmed);
  const ids = valueParser.parseIds(schema.isArray);
  
  if (schema.isArray) {
    return ids.map(id => resolveReferenceId(id, lookup, schema.tableName));
  }
  
  return resolveReferenceId(ids[0], lookup, schema.tableName);
}

/**
 * Parser for reference values (extracts IDs from value string)
 */
class ReferenceValueParser {
  private input: string;
  private pos: number = 0;

  constructor(input: string) {
    this.input = input;
  }

  private peek(): string {
    return this.input[this.pos] || '';
  }

  private consume(): string {
    return this.input[this.pos++] || '';
  }

  private skipWhitespace(): void {
    while (this.pos < this.input.length && /\s/.test(this.input[this.pos])) {
      this.pos++;
    }
  }

  private consumeStr(str: string): boolean {
    if (this.input.slice(this.pos, this.pos + str.length) === str) {
      this.pos += str.length;
      return true;
    }
    return false;
  }

  parseIds(isArray: boolean): string[] {
    this.skipWhitespace();

    if (isArray) {
      // Parse array format: [id1; id2; id3]
      if (this.peek() === '[') {
        this.consume();
      }

      this.skipWhitespace();

      if (this.peek() === ']') {
        this.consume();
        return [];
      }

      const ids: string[] = [];
      while (true) {
        this.skipWhitespace();
        let id = '';
        while (this.pos < this.input.length && this.peek() !== ';' && this.peek() !== ']') {
          id += this.consume();
        }
        const trimmedId = id.trim();
        if (trimmedId) {
          ids.push(trimmedId);
        }
        this.skipWhitespace();

        if (!this.consumeStr(';')) {
          break;
        }
      }

      this.skipWhitespace();
      if (this.peek() === ']') {
        this.consume();
      }

      return ids;
    } else {
      // Parse single ID
      let id = '';
      while (this.pos < this.input.length) {
        const char = this.peek();
        if (char === ';' || char === ']' || char === ',') {
          break;
        }
        id += this.consume();
      }
      return [id.trim()];
    }
  }
}

/**
 * Convert a schema to TypeScript type string
 */
export function schemaToTypeString(schema: Schema, resourceNames?: Map<string, string>): string {
  switch (schema.type) {
    case 'string':
      return 'string';
    case 'number':
    case 'int':
    case 'float':
      return 'number';
    case 'boolean':
      return 'boolean';
    case 'stringLiteral':
      return `"${schema.value}"`;
    case 'union':
      return schema.members.map(m => schemaToTypeString(m, resourceNames)).join(' | ');
    case 'reference': {
      const typeName = resourceNames?.get(schema.tableName) ||
        schema.tableName.charAt(0).toUpperCase() + schema.tableName.slice(1);
      const baseType = schema.isArray ? `${typeName}[]` : typeName;
      return schema.isOptional ? `${baseType} | null` : baseType;
    }
    case 'array':
      if (schema.element.type === 'tuple') {
        const tupleElements = schema.element.elements.map((el) => {
          const typeStr = schemaToTypeString(el.schema, resourceNames);
          return el.name ? `${el.name}: ${typeStr}` : typeStr;
        });
        return `[${tupleElements.join(', ')}][]`;
      }
      // Wrap union types in parentheses to maintain correct precedence
      const elementType = schemaToTypeString(schema.element, resourceNames);
      if (schema.element.type === 'union') {
        return `(${elementType})[]`;
      }
      return `${elementType}[]`;
    case 'tuple':
      const tupleElements = schema.elements.map((el) => {
        const typeStr = schemaToTypeString(el.schema, resourceNames);
        return el.name ? `${el.name}: ${typeStr}` : typeStr;
      });
      return `[${tupleElements.join(', ')}]`;
    default:
      return 'unknown';
  }
}

/**
 * Generate TypeScript interface for the CSV data
 */
function generateTypeDefinition(
  resourceName: string,
  propertyConfigs: PropertyConfig[],
  references: Set<string>,
  currentFilePath?: string
): string {
  const typeName = resourceName ? `${resourceName}Table` : 'Table';
  const currentTableName = currentFilePath
    ? path.basename(currentFilePath, path.extname(currentFilePath))
    : undefined;
  const singularType = resourceName
    ? resourceName.charAt(0).toUpperCase() + resourceName.slice(1)
    : `${typeName}[number]`;
  
  // Generate import statements for referenced tables
  const imports: string[] = [];
  const resourceNames = new Map<string, string>();
  
  references.forEach(tableName => {
    if (tableName === currentTableName) {
      resourceNames.set(tableName, singularType);
      return;
    }
    // Convert table name to type name by capitalizing
    const typeBase = tableName.charAt(0).toUpperCase() + tableName.slice(1);
    resourceNames.set(tableName, typeBase);
    
    // Generate import path based on current file path
    let importPath: string;
    if (currentFilePath) {
      importPath = `./${tableName}.csv`;
    } else {
      importPath = `../${tableName}.csv`;
    }
    imports.push(`import type { ${typeBase} } from '${importPath}';`);
  });
  
  const importSection = imports.length > 0 ? imports.join('\n') + '\n\n' : '';
  
  const properties = propertyConfigs
    .map((config) => `    readonly ${config.name}: ${schemaToTypeString(config.schema, resourceNames)};`)
    .join('\n');

  let exportAlias = '';
  if (resourceName) {
    const singularType = resourceName.charAt(0).toUpperCase() + resourceName.slice(1);
    exportAlias = `\nexport type ${singularType} = ${typeName}[number];`;
  }

  return `${importSection}type ${typeName} = readonly {
${properties}
}[];
${exportAlias}

declare function getData(): ${typeName};
export default getData;
`;
}

/**
 * Parse CSV content string into structured data with schema validation.
 * This is a standalone function that doesn't depend on webpack/rspack LoaderContext.
 *
 * @param content - CSV content string (must have at least headers + schema row + 1 data row)
 * @param options - Parsing options
 * @returns CsvParseResult containing parsed data and optional type definitions
 */
export function parseCsv(
  content: string,
  options: CsvLoaderOptions & { resourceName?: string } = {}
): CsvParseResult {
  const delimiter = options.delimiter ?? ',';
  const quote = options.quote ?? '"';
  const escape = options.escape ?? '\\';
  const bom = options.bom ?? true;
  const comment = options.comment === false ? undefined : (options.comment ?? '#');
  const trim = options.trim ?? true;
  const emitTypes = options.emitTypes ?? true;
  const refBaseDir = options.refBaseDir;
  const defaultPrimaryKey = options.defaultPrimaryKey ?? 'id';

  const records = parse(content, {
    delimiter,
    quote,
    escape,
    bom,
    comment,
    trim,
    skip_empty_lines: true,
    relax_column_count: true,
  });

  if (records.length < 2) {
    throw new Error('CSV must have at least 2 rows: headers and schemas');
  }

  const headers = records[0];
  const schemas = records[1];

  if (headers.length !== schemas.length) {
    throw new Error(
      `Header count (${headers.length}) does not match schema count (${schemas.length})`
    );
  }

  const resolveReferences = options.resolveReferences ?? true;

  const propertyConfigs: PropertyConfig[] = headers.map((header: string, index: number) => {
    const schemaString = schemas[index];
    const schema = parseSchema(schemaString);
    
    const config: PropertyConfig = {
      name: header,
      schema,
      validator: createValidator(schema),
      parser: (valueString: string) => parseValue(schema, valueString),
    };
    
    if (schema.type === 'reference') {
      config.isReference = true;
      config.referenceTableName = schema.tableName;
      config.referenceIsArray = schema.isArray;
      if (resolveReferences) {
        config.parser = (valueString: string) => {
          return parseReferenceValue(schema, valueString, refBaseDir, defaultPrimaryKey, options.currentFilePath);
        };
      } else {
        config.parser = (valueString: string) => {
          return parseReferenceIds(schema, valueString);
        };
      }
    } else if (hasNestedReferences(schema)) {
      config.isReference = true;
      if (resolveReferences) {
        config.parser = (valueString: string) => {
          return parseValueWithReferences(valueString, schema, refBaseDir, defaultPrimaryKey, options.currentFilePath);
        };
      } else {
        config.parser = (valueString: string) => {
          return parseValueWithReferenceIds(valueString, schema);
        };
      }
    }
    
    return config;
  });

  // Collect all referenced tables (including nested references in tuples/arrays)
  const references = new Set<string>();
  function collectReferences(schema: Schema): void {
    if (schema.type === 'reference') {
      references.add(schema.tableName);
    } else if (schema.type === 'tuple') {
      schema.elements.forEach(el => collectReferences(el.schema));
    } else if (schema.type === 'array') {
      collectReferences(schema.element);
    } else if (schema.type === 'union') {
      schema.members.forEach(m => collectReferences(m));
    }
  }
  propertyConfigs.forEach(config => {
    if (config.isReference && config.referenceTableName) {
      references.add(config.referenceTableName);
    }
    collectReferences(config.schema);
  });

  const dataRows = records.slice(2);
  const objects = dataRows.map((row: string[], rowIndex: number) => {
    const obj: Record<string, unknown> = {};
    propertyConfigs.forEach((config, colIndex) => {
      const rawValue = row[colIndex] ?? '';
      try {
        const parsed = config.parser(rawValue);
        // Skip validation for reference fields (validation happens during reference resolution)
        if (!config.isReference && !config.validator(parsed)) {
          throw new Error(
            `Validation failed for property "${config.name}" at row ${rowIndex + 3}: ${rawValue}`
          );
        }
        obj[config.name] = parsed;
      } catch (error) {
        if (error instanceof Error) {
          throw new Error(
            `Failed to parse property "${config.name}" at row ${rowIndex + 3}, column ${colIndex + 1}: ${error.message}`
          );
        }
        throw error;
      }
    });
    return obj;
  });

  const referenceFields: ReferenceFieldInfo[] = [];
  if (!resolveReferences) {
    for (const config of propertyConfigs) {
      if (hasNestedReferences(config.schema)) {
        referenceFields.push(...collectReferenceFields(config.schema, config.name));
      }
    }
  }

  const result: CsvParseResult = {
    data: objects,
    propertyConfigs,
    references,
    referenceFields,
  };

  if (emitTypes) {
    result.typeDefinition = generateTypeDefinition(
      options.resourceName || '', 
      propertyConfigs,
      references,
      options.currentFilePath
    );
  }

  return result;
}

/**
 * Generate runtime reference resolution code for a schema.
 * Returns a JS expression string that resolves references using lookup maps.
 */
function generateSchemaResolutionCode(
  schema: Schema,
  valueExpr: string,
  lookupVar: (tableName: string) => string,
  pkField: string
): string {
  switch (schema.type) {
    case 'reference': {
      const lookup = lookupVar(schema.tableName);
      if (schema.isOptional) {
        if (schema.isArray) {
          return `(${valueExpr} === null || ${valueExpr} === undefined ? ${valueExpr} : (Array.isArray(${valueExpr}) ? ${valueExpr}.map(id => ${lookup}.get(String(id))) : ${lookup}.get(String(${valueExpr}))))`;
        }
        return `(${valueExpr} === null || ${valueExpr} === undefined ? ${valueExpr} : ${lookup}.get(String(${valueExpr})))`;
      }
      if (schema.isArray) {
        return `(Array.isArray(${valueExpr}) ? ${valueExpr}.map(id => ${lookup}.get(String(id))) : ${valueExpr})`;
      }
      return `${lookup}.get(String(${valueExpr}))`;
    }
    case 'tuple': {
      const elementResolvers = schema.elements.map((el, i) => {
        if (hasNestedReferences(el.schema)) {
          return generateSchemaResolutionCode(el.schema, `${valueExpr}[${i}]`, lookupVar, pkField);
        }
        return `${valueExpr}[${i}]`;
      });
      return `[${elementResolvers.join(', ')}]`;
    }
    case 'array': {
      if (hasNestedReferences(schema.element)) {
        const itemResolve = generateSchemaResolutionCode(schema.element, 'item', lookupVar, pkField);
        return `(${valueExpr}).map(item => ${itemResolve})`;
      }
      return valueExpr;
    }
    case 'union': {
      const refMembers = schema.members.filter(m => hasNestedReferences(m));
      const nonRefMembers = schema.members.filter(m => !hasNestedReferences(m));
      const resolveParts: string[] = [];
      for (const member of refMembers) {
        const resolveCode = generateSchemaResolutionCode(member, valueExpr, lookupVar, pkField);
        resolveParts.push(resolveCode);
      }
      if (nonRefMembers.length > 0) {
        resolveParts.push(valueExpr);
      }
      if (resolveParts.length === 0) return valueExpr;
      if (resolveParts.length === 1) return resolveParts[0];
      return `(${resolveParts.join(' ?? ')})`;
    }
    default:
      return valueExpr;
  }
}

/**
 * Generate JavaScript module code from CSV content.
 * Emits an accessor function for tables with references (lazy resolution),
 * or static JSON for tables without references.
 */
export function csvToModule(
  content: string,
  options: CsvLoaderOptions & { resourceName?: string } = {}
): { js: string; dts?: string } {
  const result = parseCsv(content, { ...options, resolveReferences: false });

  const hasRefs = result.referenceFields.length > 0;
  const defaultPrimaryKey = options.defaultPrimaryKey ?? 'id';

  const imports: string[] = [];
  const lookupInits: string[] = [];
  const lookupVarMap = new Map<string, string>();

  const currentTableName = options.currentFilePath
    ? path.basename(options.currentFilePath, path.extname(options.currentFilePath))
    : undefined;

  const uniqueTables = new Set(result.referenceFields.map(f => f.tableName));
  uniqueTables.forEach(tableName => {
    const lookupVar = `_${tableName}Lookup`;
    lookupVarMap.set(tableName, lookupVar);

    if (tableName === currentTableName) {
      lookupInits.push(
        `const ${lookupVar} = new Map(_raw.map(p => [String(p.${defaultPrimaryKey}), p]));`
      );
    } else {
      const varName = `_${tableName}`;
      imports.push(`import ${varName} from './${tableName}.csv';`);
      lookupInits.push(
        `const ${lookupVar} = new Map(${varName}().map(p => [String(p.${defaultPrimaryKey}), p]));`
      );
    }
  });

  const lookupVar = (tableName: string) => lookupVarMap.get(tableName)!;

  const rowResolvers: string[] = [];
  for (const config of result.propertyConfigs) {
    if (hasNestedReferences(config.schema)) {
      const resolveCode = generateSchemaResolutionCode(
        config.schema,
        `row.${config.name}`,
        lookupVar,
        defaultPrimaryKey
      );
      rowResolvers.push(`    ${config.name}: ${resolveCode},`);
    }
  }

  const rawJson = JSON.stringify(result.data, null, 2);

  const js = [
    ...imports,
    '',
    `const _raw = ${rawJson};`,
    '',
    'let _resolved = null;',
    '',
    'export default function getData() {',
    '  if (_resolved) return _resolved;',
    '  _resolved = _raw;',
    ...lookupInits.map(l => `  ${l}`),
    ...rowResolvers.length > 0 ? [
      '  _resolved = _raw.map(row => ({',
      '    ...row,',
      ...rowResolvers,
      '  }));',
    ] : [],
    '  return _resolved;',
    '}',
  ].join('\n');

  return {
    js,
    dts: result.typeDefinition,
  };
}