/**
 * TypeScript declaration file generator — produces index.d.ts with the fly
 * resource classes (App, Machine, Volume) and their property-type classes.
 */

import type { FlyParseResult } from "../spec/parse";
import type { NamingStrategy } from "./naming";
import {
  writeResourceClass,
  writePropertyClass,
  type DtsProperty,
  type DtsAttribute,
} from "@intentius/chant/codegen/generate-typescript";

interface Entry {
  tsName: string;
  isProperty: boolean;
  properties: DtsProperty[];
  attributes: DtsAttribute[];
}

/**
 * Generate the complete .d.ts file content.
 */
export function generateTypeScriptDeclarations(results: FlyParseResult[], naming: NamingStrategy): string {
  const lines: string[] = [];
  lines.push("// Code generated by chant fly generate. DO NOT EDIT.");

  const entries: Entry[] = [];

  for (const r of results) {
    const tsName = naming.resolve(r.resource.typeName);
    if (!tsName) continue;

    const properties: DtsProperty[] = r.resource.properties.map((p) => ({
      name: p.name,
      type: p.tsType,
      required: p.required,
      description: p.description,
    }));
    const attributes: DtsAttribute[] = r.resource.attributes.map((a) => ({ name: a.name, type: a.tsType }));

    entries.push({ tsName, isProperty: !!r.isProperty, properties, attributes });
  }

  entries.sort((a, b) => a.tsName.localeCompare(b.tsName));

  const resources = entries.filter((e) => !e.isProperty);
  const propertyTypes = entries.filter((e) => e.isProperty);

  if (resources.length > 0) {
    lines.push("");
    lines.push("// --- Fly Resource classes ---");
    for (const re of resources) {
      writeResourceClass(lines, re.tsName, re.properties, re.attributes);
    }
  }

  if (propertyTypes.length > 0) {
    lines.push("");
    lines.push("// --- Property type classes ---");
    for (const pe of propertyTypes) {
      writePropertyClass(lines, pe.tsName, pe.properties);
    }
  }

  lines.push("");
  return lines.join("\n");
}