import { GITEA_URL, GITEA_USERNAME, GITEA_TOKEN } from './config';
import type { GiteaRepo, GiteaCommit, HeatmapEntry } from './types';

function headers() {
  const h: Record<string,string> = { 'Accept': 'application/json' };
  if (GITEA_TOKEN) h['Authorization'] = `token ${GITEA_TOKEN}`;
  return h;
}

async function get<T>(path: string): Promise<T> {
  const res = await fetch(`${GITEA_URL}/api/v1${path}`, { headers: headers() });
  if (!res.ok) throw new Error(`Gitea API ${path}: HTTP ${res.status}`);
  return res.json();
}

export async function getRepos(limit = 6): Promise<GiteaRepo[]> {
  return get<GiteaRepo[]>(`/users/${GITEA_USERNAME}/repos?limit=${limit}&sort=newest`);
}

export async function getHeatmap(): Promise<HeatmapEntry[]> {
  return get<HeatmapEntry[]>(`/users/${GITEA_USERNAME}/heatmap`);
}

export async function getRepoCommits(repo: string, limit = 5): Promise<GiteaCommit[]> {
  return get<GiteaCommit[]>(`/repos/${GITEA_USERNAME}/${repo}/commits?limit=${limit}`);
}

export async function getRecentCommits(repos: GiteaRepo[], perRepo = 4): Promise<GiteaCommit[]> {
  const results = await Promise.allSettled(
    repos.slice(0, 4).map(r =>
      getRepoCommits(r.name, perRepo).then(commits =>
        commits.map(c => ({ ...c, _repo: r.name, _repoUrl: r.html_url }))
      )
    )
  );
  const all: GiteaCommit[] = [];
  results.forEach(r => { if (r.status === 'fulfilled') all.push(...r.value); });
  return all.sort((a, b) => new Date(b.created).getTime() - new Date(a.created).getTime()).slice(0, 15);
}
export function calcStats(heatmap: HeatmapEntry[]) {
  const yearAgo = Date.now() / 1000 - 365 * 86400;
  const year = heatmap.filter(e => e.timestamp > yearAgo);
  const total = year.reduce((s, e) => s + e.contributions, 0);
  const activeDays = year.filter(e => e.contributions > 0).length;

  const dateSet = new Set<string>();
  year.forEach(e => {
    const d = new Date(e.timestamp * 1000);
    dateSet.add(d.toISOString().split('T')[0]);
  });

  const today = new Date();
  today.setHours(0, 0, 0, 0);

  let currentStreak = 0;
  const cur = new Date(today);
  if (!dateSet.has(cur.toISOString().split('T')[0])) cur.setDate(cur.getDate() - 1);
  while (dateSet.has(cur.toISOString().split('T')[0])) {
    currentStreak++;
    cur.setDate(cur.getDate() - 1);
  }

  let longestStreak = 0, streak = 0;
  const sorted = Array.from(dateSet).sort(); // ← only change
  for (let i = 0; i < sorted.length; i++) {
    if (i === 0) { streak = 1; continue; }
    const prev = new Date(sorted[i - 1]);
    prev.setDate(prev.getDate() + 1);
    if (prev.toISOString().split('T')[0] === sorted[i]) { streak++; }
    else { streak = 1; }
    if (streak > longestStreak) longestStreak = streak;
  }
  if (streak > longestStreak) longestStreak = streak;

  return { total, currentStreak, longestStreak, activeDays };
}