/**
 * @wrnexus/compiler — the `.wrn` language compiler.
 *
 * Parsing and language diagnostics are provided by the canonical
 * `@wrnexus/syntax` package. This package owns platform-specific codegen.
 */

import {
  assertValidAst,
  diagnose,
  diagnosticFromError,
  formatDiagnostic,
  parse,
  ParseError,
  type PageAst,
  type WrnDiagnostic,
} from "@wrnexus/syntax";
import { generate } from "./codegen.ts";
import { generateNative } from "./native-codegen.ts";

export {
  assertValidAst,
  diagnose,
  diagnosticFromError,
  formatDiagnostic,
  parse,
  ParseError,
} from "@wrnexus/syntax";
export { generate } from "./codegen.ts";
export { generateNative, NativeCompileError } from "./native-codegen.ts";
export { Lexer, LexError } from "@wrnexus/syntax";
export { eraseFunctionTypes, inferredRuntimeType, runtimeTypeOf } from "@wrnexus/syntax";
export type {
  ActionBlock,
  ApiBlock,
  Attr,
  ComputedDecl,
  DataApiBlock,
  DataMode,
  EffectBlock,
  EventDecl,
  LoadBlock,
  ModeFunctionsBlock,
  PageAst,
  PropDecl,
  RealtimeBlock,
  SeoBlock,
  StateDecl,
  ViewNode,
  WrnDiagnostic,
} from "@wrnexus/syntax";

export interface CompileResult {
  code: string;
  ast: PageAst;
  /** Backward-compatible plain diagnostic messages. */
  diagnostics: string[];
  /** Structured diagnostics for editors, CI, and the DevToolbar. */
  richDiagnostics: WrnDiagnostic[];
}

/** Compile `.wrn` source into an Expo Router React Native screen. */
export function compileNativeWireFile(source: string): string {
  const ast = parse(source);
  assertValidAst(ast);
  return generateNative(ast);
}

/**
 * Compile `.wrn` source into TypeScript source. Errors include a stable code,
 * source location, code frame, and actionable hint whenever available.
 */
export function compileWireFile(source: string, filePath = "<inline .wrn>"): string {
  try {
    const ast = parse(source);
    assertValidAst(ast, { file: filePath, accessibility: true });
    return `// compiled from .wrn\n${generate(ast)}`;
  } catch (error) {
    const diagnostic = diagnosticFromError(source, error, { file: filePath });
    throw new Error(`Failed to parse ${filePath}:\n\n${formatDiagnostic(source, diagnostic)}`, {
      cause: error,
    });
  }
}

/** Richer entry point returning the AST and structured diagnostics. */
export function compile(source: string, filePath = "<inline .wrn>"): CompileResult {
  const richDiagnostics = diagnose(source, { file: filePath, accessibility: true });
  const errors = richDiagnostics.filter((diagnostic) => diagnostic.severity === "error");
  if (errors.length > 0) {
    throw new ParseError(
      errors.map((diagnostic) => diagnostic.message).join("\n"),
      errors[0]!.code,
    );
  }
  const ast = parse(source);
  return {
    code: `// compiled from .wrn\n${generate(ast)}`,
    ast,
    diagnostics: richDiagnostics.map((diagnostic) => `${diagnostic.code}: ${diagnostic.message}`),
    richDiagnostics,
  };
}