/**
 * @license
 * Copyright 2026 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import { GITHUB_OWNER, GITHUB_REPO } from '../types.js';
import { execSync } from 'node:child_process';

try {
  const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000).toISOString();
  
  const query = `
  query($owner: String!, $repo: String!, $issueQuery: String!, $prQuery: String!) {
    repository(owner: $owner, name: $repo) {
      issues: search(query: $issueQuery, type: ISSUE, first: 100) {
        nodes {
          ... on Issue {
            authorAssociation
            createdAt
            closedAt
          }
        }
      }
      prs: search(query: $prQuery, type: ISSUE, first: 100) {
        nodes {
          ... on PullRequest {
            authorAssociation
            createdAt
            mergedAt
          }
        }
      }
    }
  }
  `;

  const issueQuery = `repo:${GITHUB_OWNER}/${GITHUB_REPO} is:issue is:closed closed:>${sevenDaysAgo.split('T')[0]} sort:closed-desc`;
  const prQuery = `repo:${GITHUB_OWNER}/${GITHUB_REPO} is:pr is:merged merged:>${sevenDaysAgo.split('T')[0]} sort:merged-desc`;

  const output = execSync(
    `gh api graphql -F owner=${GITHUB_OWNER} -F repo=${GITHUB_REPO} -F issueQuery='${issueQuery}' -F prQuery='${prQuery}' -f query='${query}'`,
    { encoding: 'utf-8' },
  );
  const data = JSON.parse(output).data.repository;

  const prs = data.prs.nodes.map(
    (p: {
      authorAssociation: string;
      mergedAt: string;
      createdAt: string;
    }) => ({
      association: p.authorAssociation,
      latencyHours:
        (new Date(p.mergedAt).getTime() - new Date(p.createdAt).getTime()) /
        (1000 * 60 * 60),
    }),
  );
  const issues = data.issues.nodes.map(
    (i: {
      authorAssociation: string;
      closedAt: string;
      createdAt: string;
    }) => ({
      association: i.authorAssociation,
      latencyHours:
        (new Date(i.closedAt).getTime() - new Date(i.createdAt).getTime()) /
        (1000 * 60 * 60),
    }),
  );

  const isMaintainer = (assoc: string) =>
    ['MEMBER', 'OWNER', 'COLLABORATOR'].includes(assoc);
  const calculateAvg = (
    items: { association: string; latencyHours: number }[],
  ) =>
    items.length
      ? items.reduce((a, b) => a + b.latencyHours, 0) / items.length
      : 0;

  const prMaintainers = calculateAvg(
    prs.filter((i: { association: string; latencyHours: number }) =>
      isMaintainer(i.association),
    ),
  );
  const prCommunity = calculateAvg(
    prs.filter(
      (i: { association: string; latencyHours: number }) =>
        !isMaintainer(i.association),
    ),
  );
  const prOverall = calculateAvg(prs);

  const issueMaintainers = calculateAvg(
    issues.filter((i: { association: string; latencyHours: number }) =>
      isMaintainer(i.association),
    ),
  );
  const issueCommunity = calculateAvg(
    issues.filter(
      (i: { association: string; latencyHours: number }) =>
        !isMaintainer(i.association),
    ),
  );
  const issueOverall = calculateAvg(issues);

  process.stdout.write(`latency_pr_overall_hours,${Math.round(prOverall * 100) / 100}\n`);
  process.stdout.write(`latency_pr_maintainers_hours,${Math.round(prMaintainers * 100) / 100}\n`);
  process.stdout.write(`latency_pr_community_hours,${Math.round(prCommunity * 100) / 100}\n`);
  process.stdout.write(`latency_issue_overall_hours,${Math.round(issueOverall * 100) / 100}\n`);
  process.stdout.write(`latency_issue_maintainers_hours,${Math.round(issueMaintainers * 100) / 100}\n`);
  process.stdout.write(`latency_issue_community_hours,${Math.round(issueCommunity * 100) / 100}\n`);
} catch (err) {
  process.stderr.write(err instanceof Error ? err.message : String(err));
  process.exit(1);
}