// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import '../../src/base/process.dart';
import '../../src/convert.dart' show json;
import '../../src/macos/xcode.dart';
import '../convert.dart';

/// The generator of xcresults.
///
/// Call [generate] after an iOS/MacOS build will generate a [XCResult].
/// This only works when the `-resultBundleVersion` is set to 3.
/// * See also: [XCResult].
class XCResultGenerator {
  /// Construct the [XCResultGenerator].
  XCResultGenerator({
    required this.resultPath,
    required this.xcode,
    required this.processUtils,
  });

  /// The file path that used to store the xcrun result.
  ///
  /// There's usually a `resultPath.xcresult` file in the same folder.
  final String resultPath;

  /// The [ProcessUtils] to run commands.
  final ProcessUtils processUtils;

  /// [Xcode] object used to run xcode command.
  final Xcode xcode;

  /// Generates the XCResult.
  ///
  /// Calls `xcrun xcresulttool get --path <resultPath> --format json`,
  /// then stores the useful information the json into an [XCResult] object.
  Future<XCResult> generate() async {
    final RunResult result = await processUtils.run(
      <String>[
        ...xcode.xcrunCommand(),
        'xcresulttool',
        'get',
        '--path',
        resultPath,
        '--format',
        'json',
      ],
    );
    if (result.exitCode != 0) {
      return XCResult.failed(errorMessage: result.stderr);
    }
    if (result.stdout.isEmpty) {
      return XCResult.failed(
          errorMessage: 'xcresult parser: Unrecognized top level json format.');
    }
    final Object? resultJson = json.decode(result.stdout);
    if (resultJson == null || resultJson is! Map<String, Object?>) {
      // If json parsing failed, indicate such error.
      // This also includes the top level json object is an array, which indicates
      // the structure of the json is changed and this parser class possibly needs to update for this change.
      return XCResult.failed(
          errorMessage: 'xcresult parser: Unrecognized top level json format.');
    }
    return XCResult(resultJson: resultJson);
  }
}

/// The xcresult of an `xcodebuild` command.
///
/// This is the result from an `xcrun xcresulttool get --path <resultPath> --format json` run.
/// The result contains useful information such as build errors and warnings.
class XCResult {
  /// Parse the `resultJson` and stores useful informations in the returned `XCResult`.
  factory XCResult({required Map<String, Object?> resultJson}) {
    final List<XCResultIssue> issues = <XCResultIssue>[];
    final Object? actionsMap = resultJson['actions'];
    if (actionsMap == null || actionsMap is! Map<String, Object?>) {
      return XCResult.failed(
          errorMessage: 'xcresult parser: Failed to parse the actions map.');
    }
    final Object? actionValueList = actionsMap['_values'];
    if (actionValueList == null ||
        actionValueList is! List<Object?> ||
        actionValueList.isEmpty) {
      return XCResult.failed(
          errorMessage: 'xcresult parser: Failed to parse the actions map.');
    }
    final Object? actionMap = actionValueList.first;
    if (actionMap == null || actionMap is! Map<String, Object?>) {
      return XCResult.failed(
          errorMessage:
              'xcresult parser: Failed to parse the first action map.');
    }
    final Object? buildResultMap = actionMap['buildResult'];
    if (buildResultMap == null || buildResultMap is! Map<String, Object?>) {
      return XCResult.failed(
          errorMessage:
              'xcresult parser: Failed to parse the buildResult map.');
    }
    final Object? issuesMap = buildResultMap['issues'];
    if (issuesMap == null || issuesMap is! Map<String, Object?>) {
      return XCResult.failed(
          errorMessage: 'xcresult parser: Failed to parse the issues map.');
    }
    List<XCResultIssue> _parseIssuesFromIssueSummariesJson({
      required XCResultIssueType type,
      required Map<String, Object?> issueSummariesJson,
    }) {
      final List<XCResultIssue> issues = <XCResultIssue>[];
      final Object? errorsList = issueSummariesJson['_values'];
      if (errorsList is List<Object?>) {
        for (final Object? issueJson in errorsList) {
          if (issueJson == null || issueJson is! Map<String, Object?>) {
            continue;
          }
          final XCResultIssue resultIssue = XCResultIssue(
            type: type,
            issueJson: issueJson,
          );
          issues.add(resultIssue);
        }
      }
      return issues;
    }

    final Object? errorSummaries = issuesMap['errorSummaries'];
    if (errorSummaries is Map<String, Object?>) {
      issues.addAll(_parseIssuesFromIssueSummariesJson(
        type: XCResultIssueType.error,
        issueSummariesJson: errorSummaries,
      ));
    }

    final Object? warningSummaries = issuesMap['warningSummaries'];
    if (warningSummaries is Map<String, Object?>) {
      issues.addAll(_parseIssuesFromIssueSummariesJson(
        type: XCResultIssueType.warning,
        issueSummariesJson: warningSummaries,
      ));
    }
    return XCResult._(issues: issues);
  }

  factory XCResult.failed({required String errorMessage}) {
    return XCResult._(
      parseSuccess: false,
      parsingErrorMessage: errorMessage,
    );
  }

  XCResult._({
    this.issues = const <XCResultIssue>[],
    this.parseSuccess = true,
    this.parsingErrorMessage,
  });

  /// The issues in the xcresult file.
  final List<XCResultIssue> issues;

  /// Indicate if the xcresult was successfully parsed.
  ///
  /// See also: [parsingErrorMessage] for the error message if the parsing was unsuccessful.
  final bool parseSuccess;

  /// The error message describes why the parse if unsuccessful.
  ///
  /// This is `null` if [parseSuccess] is `true`.
  final String? parsingErrorMessage;
}

/// An issue object in the XCResult
class XCResultIssue {
  /// Construct an `XCResultIssue` object from `issueJson`.
  ///
  /// `issueJson` is the object at xcresultJson[['actions']['_values'][0]['buildResult']['issues']['errorSummaries'/'warningSummaries']['_values'].
  factory XCResultIssue({
    required XCResultIssueType type,
    required Map<String, Object?> issueJson,
  }) {
    final Object? issueSubTypeMap = issueJson['issueType'];
    String subType = '';
    if (issueSubTypeMap is Map<String, Object?>) {
      final Object? subTypeValue = issueSubTypeMap['_value'];
      if (subTypeValue is String) {
        subType = subTypeValue;
      }
    }

    String message = '';
    final Object? messageMap = issueJson['message'];
    if (messageMap is Map<String, Object?>) {
      final Object? messageValue = messageMap['_value'];
      if (messageValue is String) {
        message = messageValue;
      }
    }

    return XCResultIssue._(
      type: type,
      subType: subType,
      message: message,
    );
  }

  XCResultIssue._({
    required this.type,
    required this.subType,
    required this.message,
  });

  /// The type of the issue.
  final XCResultIssueType type;

  /// The sub type of the issue.
  ///
  /// This is a more detailed category about the issue.
  /// The possible values are `Warning`, `Semantic Issue'` etc.
  final String subType;

  /// Human readable message for the issue.
  ///
  /// This can be displayed to user for their information.
  final String message;
}

/// The type of an `XCResultIssue`.
enum XCResultIssueType {
  /// The issue is an warning.
  ///
  /// This is for all the issues under the `warningSummaries` key in the xcresult.
  warning,

  /// The issue is an warning.
  ///
  /// This is for all the issues under the `errorSummaries` key in the xcresult.
  error,
}