// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.

//! There are many types of errors in Deno:
//! - AnyError: a generic wrapper that can encapsulate any type of error.
//! - JsError: a container for the error message and stack trace for exceptions
//!   thrown in JavaScript code. We use this to pretty-print stack traces.
//! - Diagnostic: these are errors that originate in TypeScript's compiler.
//!   They're similar to JsError, in that they have line numbers. But
//!   Diagnostics are compile-time type errors, whereas JsErrors are runtime
//!   exceptions.

use deno_ast::ParseDiagnostic;
use deno_core::error::AnyError;
use deno_graph::source::ResolveError;
use deno_graph::ModuleError;
use deno_graph::ModuleGraphError;
use deno_graph::ModuleLoadError;
use deno_graph::ResolutionError;
use import_map::ImportMapError;

fn get_import_map_error_class(_: &ImportMapError) -> &'static str {
  "URIError"
}

fn get_diagnostic_class(_: &ParseDiagnostic) -> &'static str {
  "SyntaxError"
}

fn get_module_graph_error_class(err: &ModuleGraphError) -> &'static str {
  use deno_graph::JsrLoadError;
  use deno_graph::NpmLoadError;

  match err {
    ModuleGraphError::ResolutionError(err)
    | ModuleGraphError::TypesResolutionError(err) => {
      get_resolution_error_class(err)
    }
    ModuleGraphError::ModuleError(err) => match err {
      ModuleError::InvalidTypeAssertion { .. } => "SyntaxError",
      ModuleError::ParseErr(_, diagnostic) => get_diagnostic_class(diagnostic),
      ModuleError::UnsupportedMediaType { .. }
      | ModuleError::UnsupportedImportAttributeType { .. } => "TypeError",
      ModuleError::Missing(_, _) | ModuleError::MissingDynamic(_, _) => {
        "NotFound"
      }
      ModuleError::LoadingErr(_, _, err) => match err {
        ModuleLoadError::Loader(err) => get_error_class_name(err.as_ref()),
        ModuleLoadError::HttpsChecksumIntegrity(_)
        | ModuleLoadError::TooManyRedirects => "Error",
        ModuleLoadError::NodeUnknownBuiltinModule(_) => "NotFound",
        ModuleLoadError::Decode(_) => "TypeError",
        ModuleLoadError::Npm(err) => match err {
          NpmLoadError::NotSupportedEnvironment
          | NpmLoadError::PackageReqResolution(_)
          | NpmLoadError::RegistryInfo(_) => "Error",
          NpmLoadError::PackageReqReferenceParse(_) => "TypeError",
        },
        ModuleLoadError::Jsr(err) => match err {
          JsrLoadError::UnsupportedManifestChecksum
          | JsrLoadError::PackageFormat(_) => "TypeError",
          JsrLoadError::ContentLoadExternalSpecifier
          | JsrLoadError::ContentLoad(_)
          | JsrLoadError::ContentChecksumIntegrity(_)
          | JsrLoadError::PackageManifestLoad(_, _)
          | JsrLoadError::PackageVersionManifestChecksumIntegrity(..)
          | JsrLoadError::PackageVersionManifestLoad(_, _)
          | JsrLoadError::RedirectInPackage(_) => "Error",
          JsrLoadError::PackageNotFound(_)
          | JsrLoadError::PackageReqNotFound(_)
          | JsrLoadError::PackageVersionNotFound(_)
          | JsrLoadError::UnknownExport { .. } => "NotFound",
        },
      },
      ModuleError::WasmParseErr(_, _) => "SyntaxError",
    },
  }
}

fn get_resolution_error_class(err: &ResolutionError) -> &'static str {
  match err {
    ResolutionError::ResolverError { error, .. } => {
      use ResolveError::*;
      match error.as_ref() {
        Specifier(_) => "TypeError",
        Other(e) => get_error_class_name(e),
      }
    }
    _ => "TypeError",
  }
}

fn get_try_from_int_error_class(_: &std::num::TryFromIntError) -> &'static str {
  "TypeError"
}

pub fn get_error_class_name(e: &AnyError) -> &'static str {
  deno_runtime::errors::get_error_class_name(e)
    .or_else(|| {
      e.downcast_ref::<ImportMapError>()
        .map(get_import_map_error_class)
    })
    .or_else(|| {
      e.downcast_ref::<ParseDiagnostic>()
        .map(get_diagnostic_class)
    })
    .or_else(|| {
      e.downcast_ref::<ModuleGraphError>()
        .map(get_module_graph_error_class)
    })
    .or_else(|| {
      e.downcast_ref::<ResolutionError>()
        .map(get_resolution_error_class)
    })
    .or_else(|| {
      e.downcast_ref::<std::num::TryFromIntError>()
        .map(get_try_from_int_error_class)
    })
    .unwrap_or("Error")
}