import { Ono } from '@jsdevtools/ono';

import type { $RefParser } from '..';
import type $Ref from '../ref';
import type { JSONSchema } from '../types';
import { getHash, stripHash, toFileSystemPath } from './url';

export type JSONParserErrorType =
  | 'EUNKNOWN'
  | 'EPARSER'
  | 'EUNMATCHEDPARSER'
  | 'ETIMEOUT'
  | 'ERESOLVER'
  | 'EUNMATCHEDRESOLVER'
  | 'EMISSINGPOINTER'
  | 'EINVALIDPOINTER';

export class JSONParserError extends Error {
  public readonly name: string;
  public readonly message: string;
  public source: string | undefined;
  public path: Array<string | number> | null;
  public readonly code: JSONParserErrorType;
  public constructor(message: string, source?: string) {
    super();

    this.code = 'EUNKNOWN';
    this.name = 'JSONParserError';
    this.message = message;
    this.source = source;
    this.path = null;

    Ono.extend(this);
  }

  get footprint() {
    return `${this.path}+${this.source}+${this.code}+${this.message}`;
  }
}

export class JSONParserErrorGroup<S extends object = JSONSchema> extends Error {
  files: $RefParser;

  constructor(parser: $RefParser) {
    super();

    this.files = parser;
    this.name = 'JSONParserErrorGroup';
    this.message = `${this.errors.length} error${
      this.errors.length > 1 ? 's' : ''
    } occurred while reading '${toFileSystemPath(parser.$refs._root$Ref!.path)}'`;

    Ono.extend(this);
  }

  static getParserErrors<S extends object = JSONSchema>(parser: $RefParser) {
    const errors = [];

    for (const $ref of Object.values(parser.$refs._$refs) as $Ref<S>[]) {
      if ($ref.errors) {
        errors.push(...$ref.errors);
      }
    }

    return errors;
  }

  get errors(): Array<
    | JSONParserError
    | InvalidPointerError
    | ResolverError
    | ParserError
    | MissingPointerError
    | UnmatchedParserError
    | UnmatchedResolverError
  > {
    return JSONParserErrorGroup.getParserErrors<S>(this.files);
  }
}

export class ParserError extends JSONParserError {
  code = 'EPARSER' as JSONParserErrorType;
  name = 'ParserError';
  constructor(message: any, source: any) {
    super(`Error parsing ${source}: ${message}`, source);
  }
}

export class UnmatchedParserError extends JSONParserError {
  code = 'EUNMATCHEDPARSER' as JSONParserErrorType;
  name = 'UnmatchedParserError';

  constructor(source: string) {
    super(`Could not find parser for "${source}"`, source);
  }
}

export class ResolverError extends JSONParserError {
  code = 'ERESOLVER' as JSONParserErrorType;
  name = 'ResolverError';
  ioErrorCode?: string;
  constructor(ex: Error | any, source?: string) {
    super(ex.message || `Error reading file "${source}"`, source);
    if ('code' in ex) {
      this.ioErrorCode = String(ex.code);
    }
  }
}

export class UnmatchedResolverError extends JSONParserError {
  code = 'EUNMATCHEDRESOLVER' as JSONParserErrorType;
  name = 'UnmatchedResolverError';
  constructor(source: any) {
    super(`Could not find resolver for "${source}"`, source);
  }
}

export class MissingPointerError extends JSONParserError {
  code = 'EMISSINGPOINTER' as JSONParserErrorType;
  name = 'MissingPointerError';
  constructor(token: string, path: string) {
    super(
      `Missing $ref pointer "${getHash(path)}". Token "${token}" does not exist.`,
      stripHash(path),
    );
  }
}

export class TimeoutError extends JSONParserError {
  code = 'ETIMEOUT' as JSONParserErrorType;
  name = 'TimeoutError';
  constructor(timeout: number) {
    super(`Dereferencing timeout reached: ${timeout}ms`);
  }
}

export class InvalidPointerError extends JSONParserError {
  code = 'EUNMATCHEDRESOLVER' as JSONParserErrorType;
  name = 'InvalidPointerError';
  constructor(pointer: string, path: string) {
    super(`Invalid $ref pointer "${pointer}". Pointers must begin with "#/"`, stripHash(path));
  }
}

export function isHandledError(err: any): err is JSONParserError {
  return err instanceof JSONParserError || err instanceof JSONParserErrorGroup;
}

export function normalizeError(err: any) {
  if (err.path === null) {
    err.path = [];
  }

  return err;
}