import 'dart:convert';
import 'dart:io';

import 'script_utils.dart';

Future<void> writeFakeGhScript({
  required File ghScript,
  required List<Map<String, Object?>> issueListResponse,
  required Map<int, List<Map<String, Object?>>> commentResponses,
  Map<String, List<Map<String, Object?>>>? issueListResponsesByRepo,
  Map<String, Map<int, List<Map<String, Object?>>>>? commentResponsesByRepo,
  File? ghLog,
  int? postCommentIssueNumber,
  Set<int>? postCommentIssueNumbers,
  Map<String, Set<int>>? postCommentIssueNumbersByRepo,
  File? postedBodyFile,
  String? viewerLogin,
  bool failViewerLookup = false,
}) async {
  final normalizedIssueListResponsesByRepo =
      issueListResponsesByRepo ??
      <String, List<Map<String, Object?>>>{'owner/sample': issueListResponse};
  final normalizedCommentResponsesByRepo =
      commentResponsesByRepo ??
      <String, Map<int, List<Map<String, Object?>>>>{
        'owner/sample': commentResponses,
      };
  final normalizedPostCommentIssueNumbersByRepo =
      postCommentIssueNumbersByRepo ??
      <String, Set<int>>{
        'owner/sample': {
          ...?postCommentIssueNumbers,
          ...?postCommentIssueNumber == null ? null : {postCommentIssueNumber},
        },
      };
  final searchItems =
      normalizedIssueListResponsesByRepo.entries
          .expand(
            (entry) => entry.value.map(
              (issue) => <String, Object?>{
                ...issue,
                'repository_url': 'https://api.github.com/repos/${entry.key}',
              },
            ),
          )
          .toList(growable: false)
        ..sort((left, right) {
          final leftUpdatedAt = left['updated_at'] as String? ?? '';
          final rightUpdatedAt = right['updated_at'] as String? ?? '';
          return leftUpdatedAt.compareTo(rightUpdatedAt);
        });
  final openSearchItems = searchItems
      .where((item) => item['state'] == 'open')
      .toList(growable: false);
  final allSearchResponse = jsonEncode({
    'total_count': searchItems.length,
    'incomplete_results': false,
    'items': searchItems,
  });
  final openSearchResponse = jsonEncode({
    'total_count': openSearchItems.length,
    'incomplete_results': false,
    'items': openSearchItems,
  });

  final buffer = StringBuffer()
    ..writeln('#!/usr/bin/env bash')
    ..writeln('set -euo pipefail');

  if (ghLog != null) {
    buffer.writeln(
      r'''printf '%s\n' "$*" >> '''
      '"${bashScriptPath(ghLog.path)}"',
    );
  }

  buffer.writeln(r'''if [[ "$1" == "api" && "$2" == "user" ]]; then''');
  if (failViewerLookup) {
    buffer
      ..writeln(r'''  echo "viewer lookup failed" >&2''')
      ..writeln('  exit 1')
      ..writeln('fi');
  } else {
    buffer
      ..writeln("  cat <<'JSON'")
      ..writeln(jsonEncode({'login': viewerLogin ?? 'test-user'}))
      ..writeln('JSON')
      ..writeln('  exit 0')
      ..writeln('fi');
  }

  buffer
    ..writeln(r'''if [[ "$1" == "api" && "$4" == "search/issues" ]]; then''')
    ..writeln(r'''  query=""''')
    ..writeln(r'''  for arg in "$@"; do''')
    ..writeln(r'''    if [[ "$arg" == q=* ]]; then''')
    ..writeln(r'''      query="${arg#q=}"''')
    ..writeln(r'''    fi''')
    ..writeln(r'''  done''')
    ..writeln(r'''  if [[ "$query" == *"state:open"* ]]; then''')
    ..writeln("  cat <<'JSON'")
    ..writeln(openSearchResponse)
    ..writeln('JSON')
    ..writeln(r'''  else''')
    ..writeln("  cat <<'JSON'")
    ..writeln(allSearchResponse)
    ..writeln('JSON')
    ..writeln(r'''  fi''')
    ..writeln('  exit 0')
    ..writeln('fi');

  for (final entry in normalizedIssueListResponsesByRepo.entries) {
    final repo = entry.key;
    buffer
      ..writeln(
        'if [[ "\$1" == "api" && "\$4" == repos/$repo/issues\\?* ]]; then',
      )
      ..writeln("  cat <<'JSON'")
      ..writeln(jsonEncode(entry.value))
      ..writeln('JSON')
      ..writeln('  exit 0')
      ..writeln('fi');
  }

  for (final repoEntry in normalizedCommentResponsesByRepo.entries) {
    final repo = repoEntry.key;
    for (final entry in repoEntry.value.entries) {
      buffer
        ..writeln(
          'if [[ "\$1" == "api" && "\$4" == '
          '"repos/$repo/issues/${entry.key}/comments?per_page=100" ]]; then',
        )
        ..writeln("  cat <<'JSON'")
        ..writeln(jsonEncode(entry.value))
        ..writeln('JSON')
        ..writeln('  exit 0')
        ..writeln('fi');
    }
  }

  for (final repoEntry in normalizedPostCommentIssueNumbersByRepo.entries) {
    final repo = repoEntry.key;
    for (final issueNumber in repoEntry.value) {
      buffer
        ..writeln(
          'if [[ "\$1" == "api" && "\$4" == '
          '"repos/$repo/issues/$issueNumber/comments" ]]; then',
        )
        ..writeln(r'''  for arg in "$@"; do''')
        ..writeln(r'''    :''');
      if (postedBodyFile != null) {
        buffer
          ..writeln(r'''    if [[ "$arg" == body=* ]]; then''')
          ..writeln(
            r'''      printf '%s' "${arg#body=}" > '''
            '"${bashScriptPath(postedBodyFile.path)}"',
          )
          ..writeln(r'''    fi''');
      }
      buffer
        ..writeln(r'''  done''')
        ..writeln("  cat <<'JSON'")
        ..writeln(
          jsonEncode({
            'id': 700,
            'html_url': 'https://example.test/comment/700',
            'body': 'posted',
          }),
        )
        ..writeln('JSON')
        ..writeln('  exit 0')
        ..writeln('fi');
    }
  }

  buffer
    ..writeln(r'''echo "unexpected gh args: $*" >&2''')
    ..writeln('exit 1');

  await ghScript.writeAsString(buffer.toString());
  await makeScriptExecutable(ghScript);
}

Future<void> writeFlakySearchGhScript({
  required File ghScript,
  required File failureStateFile,
  required List<Map<String, Object?>> issueListResponse,
  required Map<int, List<Map<String, Object?>>> commentResponses,
  File? ghLog,
}) async {
  final searchItems = issueListResponse
      .map(
        (issue) => <String, Object?>{
          ...issue,
          'repository_url': 'https://api.github.com/repos/owner/sample',
        },
      )
      .toList(growable: false);
  final searchResponse = jsonEncode({
    'total_count': searchItems.length,
    'incomplete_results': false,
    'items': searchItems,
  });

  final buffer = StringBuffer()
    ..writeln('#!/usr/bin/env bash')
    ..writeln('set -euo pipefail');

  if (ghLog != null) {
    buffer.writeln(
      r'''printf '%s\n' "$*" >> '''
      '"${bashScriptPath(ghLog.path)}"',
    );
  }

  buffer
    ..writeln(r'''if [[ "$1" == "api" && "$2" == "user" ]]; then''')
    ..writeln("  cat <<'JSON'")
    ..writeln(jsonEncode({'login': 'test-user'}))
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(r'''if [[ "$1" == "api" && "$4" == "search/issues" ]]; then''')
    ..writeln(
      '  if [[ ! -f "${bashScriptPath(failureStateFile.path)}" ]]; then',
    )
    ..writeln('    touch "${bashScriptPath(failureStateFile.path)}"')
    ..writeln(r'''    echo "error connecting to api.github.com" >&2''')
    ..writeln(
      r'''    echo "check your internet connection or https://githubstatus.com" >&2''',
    )
    ..writeln('    exit 1')
    ..writeln(r'''  fi''')
    ..writeln("  cat <<'JSON'")
    ..writeln(searchResponse)
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  for (final entry in commentResponses.entries) {
    buffer
      ..writeln(
        'if [[ "\$1" == "api" && "\$4" == '
        '"repos/owner/sample/issues/${entry.key}/comments?per_page=100" ]]; then',
      )
      ..writeln("  cat <<'JSON'")
      ..writeln(jsonEncode(entry.value))
      ..writeln('JSON')
      ..writeln('  exit 0')
      ..writeln('fi');
  }

  buffer
    ..writeln(r'''echo "unexpected gh args: $*" >&2''')
    ..writeln('exit 1');

  await ghScript.writeAsString(buffer.toString());
  await makeScriptExecutable(ghScript);
}

Future<void> writeWebhookForwardGhScript({
  required File ghScript,
  required String repo,
  required Map<String, Object?> issue,
  required List<Map<String, Object?>> comments,
  List<Map<String, Object?>> issueListResponse = const [],
  File? ghLog,
  File? postedBodyFile,
  String? viewerLogin,
}) async {
  final issueNumber = issue['number'] as int;
  final payload = {
    'action': 'created',
    'issue': issue,
    'comment': comments.last,
    'repository': {'full_name': repo},
  };
  final searchItems = issueListResponse
      .map(
        (searchIssue) => <String, Object?>{
          ...searchIssue,
          'repository_url': 'https://api.github.com/repos/$repo',
        },
      )
      .toList(growable: false);
  final searchResponse = jsonEncode({
    'total_count': searchItems.length,
    'incomplete_results': false,
    'items': searchItems,
  });

  final buffer = StringBuffer()
    ..writeln('#!/usr/bin/env bash')
    ..writeln('set -euo pipefail');

  if (ghLog != null) {
    buffer.writeln(
      r'''printf '%s\n' "$*" >> '''
      '"${bashScriptPath(ghLog.path)}"',
    );
  }

  buffer.writeln(r'''if [[ "$1" == "api" && "$2" == "user" ]]; then''');
  buffer
    ..writeln("  cat <<'JSON'")
    ..writeln(jsonEncode({'login': viewerLogin ?? 'test-user'}))
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(r'''if [[ "$1" == "api" && "$4" == "search/issues" ]]; then''')
    ..writeln("  cat <<'JSON'")
    ..writeln(searchResponse)
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(
      'if [[ "\$1" == "api" && "\$4" == '
      '"repos/$repo/issues/$issueNumber/comments?per_page=100" ]]; then',
    )
    ..writeln("  cat <<'JSON'")
    ..writeln(jsonEncode(comments))
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(
      'if [[ "\$1" == "api" && "\$4" == '
      '"repos/$repo/issues/$issueNumber/comments" ]]; then',
    )
    ..writeln(r'''  for arg in "$@"; do''')
    ..writeln(r'''    :''');
  if (postedBodyFile != null) {
    buffer
      ..writeln(r'''    if [[ "$arg" == body=* ]]; then''')
      ..writeln(
        r'''      printf '%s' "${arg#body=}" > '''
        '"${bashScriptPath(postedBodyFile.path)}"',
      )
      ..writeln(r'''    fi''');
  }
  buffer
    ..writeln(r'''  done''')
    ..writeln("  cat <<'JSON'")
    ..writeln(
      jsonEncode({
        'id': 702,
        'html_url': 'https://example.test/comment/702',
        'body': 'posted',
      }),
    )
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(r'''if [[ "$1" == "webhook" && "$2" == "forward" ]]; then''')
    ..writeln(r'''  url=""''')
    ..writeln(r'''  for arg in "$@"; do''')
    ..writeln(r'''    if [[ "$arg" == --url=* ]]; then''')
    ..writeln(r'''      url="${arg#--url=}"''')
    ..writeln(r'''    fi''')
    ..writeln(r'''  done''')
    ..writeln(r'''  if [[ -z "$url" ]]; then''')
    ..writeln(r'''    echo "missing --url" >&2''')
    ..writeln('    exit 1')
    ..writeln(r'''  fi''')
    ..writeln(r'''  curl -sS -X POST \''')
    ..writeln(r'''    -H "Content-Type: application/json" \''')
    ..writeln(r'''    -H "X-GitHub-Event: issue_comment" \''')
    ..writeln(r'''    --data-binary @- "$url" <<'JSON' >/dev/null''')
    ..writeln(jsonEncode(payload))
    ..writeln('JSON')
    ..writeln(r'''  while true; do''')
    ..writeln(r'''    sleep 60''')
    ..writeln(r'''  done''')
    ..writeln('fi');

  buffer
    ..writeln(r'''echo "unexpected gh args: $*" >&2''')
    ..writeln('exit 1');

  await ghScript.writeAsString(buffer.toString());
  await makeScriptExecutable(ghScript);
}

Future<void> writeGitHubGosmeeGhScript({
  required File ghScript,
  required String repo,
  required int webhookId,
  required int issueNumber,
  required List<Map<String, Object?>> comments,
  List<Map<String, Object?>> issueListResponse = const [],
  File? ghLog,
  File? postedBodyFile,
  String? viewerLogin,
}) async {
  final searchItems = issueListResponse
      .map(
        (issue) => <String, Object?>{
          ...issue,
          'repository_url': 'https://api.github.com/repos/$repo',
        },
      )
      .toList(growable: false);
  final searchResponse = jsonEncode({
    'total_count': searchItems.length,
    'incomplete_results': false,
    'items': searchItems,
  });
  final buffer = StringBuffer()
    ..writeln('#!/usr/bin/env bash')
    ..writeln('set -euo pipefail');

  if (ghLog != null) {
    buffer.writeln(
      r'''printf '%s\n' "$*" >> '''
      '"${bashScriptPath(ghLog.path)}"',
    );
  }

  buffer.writeln(r'''if [[ "$1" == "api" && "$2" == "user" ]]; then''');
  buffer
    ..writeln("  cat <<'JSON'")
    ..writeln(jsonEncode({'login': viewerLogin ?? 'test-user'}))
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(r'''if [[ "$1" == "api" && "$4" == "search/issues" ]]; then''')
    ..writeln("  cat <<'JSON'")
    ..writeln(searchResponse)
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(
      'if [[ "\$1" == "api" && "\$4" == '
      '"repos/$repo/issues/$issueNumber/comments?per_page=100" ]]; then',
    )
    ..writeln("  cat <<'JSON'")
    ..writeln(jsonEncode(comments))
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln('if [[ "\$1" == "api" && "\$4" == "repos/$repo/hooks" ]]; then')
    ..writeln(r'''  active_flag=""''')
    ..writeln(r'''  for ((i = 1; i <= $#; i += 1)); do''')
    ..writeln(r'''    if [[ "${!i}" == "active=true" ]]; then''')
    ..writeln(r'''      prev_index=$((i - 1))''')
    ..writeln(r'''      active_flag="${!prev_index}"''')
    ..writeln(r'''      break''')
    ..writeln(r'''    fi''')
    ..writeln(r'''  done''')
    ..writeln(
      r'''  if [[ "$active_flag" != "-F" && "$active_flag" != "--field" ]]; then''',
    )
    ..writeln(
      r'''    echo "expected active=true to be sent with -F/--field, got: $*" >&2''',
    )
    ..writeln(r'''    exit 1''')
    ..writeln(r'''  fi''')
    ..writeln("  cat <<'JSON'")
    ..writeln(jsonEncode({'id': webhookId}))
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(
      'if [[ "\$1" == "api" && "\$4" == '
      '"repos/$repo/issues/$issueNumber/comments" ]]; then',
    )
    ..writeln(r'''  for arg in "$@"; do''')
    ..writeln(r'''    :''');
  if (postedBodyFile != null) {
    buffer
      ..writeln(r'''    if [[ "$arg" == body=* ]]; then''')
      ..writeln(
        r'''      printf '%s' "${arg#body=}" > '''
        '"${bashScriptPath(postedBodyFile.path)}"',
      )
      ..writeln(r'''    fi''');
  }
  buffer
    ..writeln(r'''  done''')
    ..writeln("  cat <<'JSON'")
    ..writeln(
      jsonEncode({
        'id': 703,
        'html_url': 'https://example.test/comment/703',
        'body': 'posted',
      }),
    )
    ..writeln('JSON')
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(
      'if [[ "\$1" == "api" && "\$4" == "repos/$repo/hooks/$webhookId" ]]; then',
    )
    ..writeln('  exit 0')
    ..writeln('fi');

  buffer
    ..writeln(r'''echo "unexpected gh args: $*" >&2''')
    ..writeln('exit 1');

  await ghScript.writeAsString(buffer.toString());
  await makeScriptExecutable(ghScript);
}