#!/usr/bin/env node
// session-start-context.mjs
// Shows active utredning sessions and KB staleness on session start.
// Output: plain text to stdout (advisory, never blocking).

import { readdirSync, readFileSync, existsSync } from 'node:fs';
import { join, relative } from 'node:path';
import { spawn } from 'node:child_process';
import {
  loadScheduleConfig,
  shouldRunDetection,
  summarizeSkillLifecycle,
  summarizeCourses,
  summarizeSkillQuality,
  summarizeTrustFreshness,
} from '../../scripts/kb-update/lib/detection-schedule.mjs';
import {
  resolveOrgDir,
  ORG_FILES,
  FREE_CONTEXT_FILE,
  buildOrgSummary,
} from '../../scripts/kb-update/lib/user-data.mjs';

const pluginRoot = process.env.CLAUDE_PLUGIN_ROOT || join(process.cwd());
const cwd = process.cwd();

const lines = [];

// --- 1. Check for active utredning sessions (.work/ directories) ---
const workDir = join(cwd, '.work');
let activeUtredninger = 0;

if (existsSync(workDir)) {
  try {
    const entries = readdirSync(workDir, { withFileTypes: true });
    for (const entry of entries) {
      if (entry.isDirectory()) {
        activeUtredninger++;
      }
    }
  } catch {
    // Ignore read errors
  }
}

// Also check docs/**/utredning.md
const docsDir = join(cwd, 'docs');
let utredningFiles = 0;

if (existsSync(docsDir)) {
  try {
    utredningFiles = countFiles(docsDir, 'utredning.md');
  } catch {
    // Ignore
  }
}

// --- 2. Check KB staleness (from sitemap-based change report) ---
const now = Date.now();
const DAY_MS = 24 * 60 * 60 * 1000;
const staleLevels = { critical: 0, high: 0, medium: 0 };
let lastPollDaysAgo = Infinity;

const changeReportPath = join(pluginRoot, 'scripts', 'kb-update', 'data', 'change-report.json');
if (existsSync(changeReportPath)) {
  try {
    const report = JSON.parse(readFileSync(changeReportPath, 'utf8'));
    staleLevels.critical = report.by_priority?.critical || 0;
    staleLevels.high = report.by_priority?.high || 0;
    staleLevels.medium = report.by_priority?.medium || 0;
    if (report.last_poll) {
      lastPollDaysAgo = (now - new Date(report.last_poll).getTime()) / DAY_MS;
    }
  } catch {
    // Ignore — fall back to showing no data
  }
}

// Opt-in background detection (Spor C / C1). Default OFF: nothing spawns unless
// the user enabled scheduled_detection in ms-ai-architect.local.md. When on +
// stale, run the Claude-FREE detection entrypoint (poll → report → discover →
// skill-lifecycle) in the background. This never invokes Claude — apply stays
// manual + in-session. See detection-schedule.mjs for the ToS rationale.
const scheduleConfig = loadScheduleConfig(pluginRoot);
if (shouldRunDetection(scheduleConfig, lastPollDaysAgo).run) {
  const detectScript = join(pluginRoot, 'scripts', 'kb-update', 'run-detection.mjs');
  if (existsSync(detectScript)) {
    try {
      spawn('node', [detectScript], { detached: true, stdio: 'ignore' }).unref();
    } catch {
      // Non-critical — silent fail
    }
  }
}

// --- 3. Check EU AI Act deadlines ---
const AI_ACT_DEADLINES = [
  // NB: Digital Omnibus (prov. enighet 2026-05-07) utsatte høyrisiko; datoer foreløpige til OJ-publisering.
  { date: new Date('2025-02-02'), label: 'Forbudte AI-praksiser (Art. 5)' },
  { date: new Date('2025-08-02'), label: 'GPAI-krav + governance/sanksjoner (Art. 99)' },
  { date: new Date('2026-08-02'), label: 'Transparens Art. 50 (syntetisk innhold)' },
  { date: new Date('2026-12-02'), label: 'Art. 50(2) merking — frist for eksisterende generative systemer (Omnibus)' },
  { date: new Date('2027-12-02'), label: 'Annex III høyrisiko (provisorisk, Omnibus — utsatt fra 2026-08-02)' },
  { date: new Date('2028-08-02'), label: 'Annex I høyrisiko innebygd (provisorisk, Omnibus)' },
];

let nearestDeadline = null;
for (const dl of AI_ACT_DEADLINES) {
  const daysLeft = Math.ceil((dl.date.getTime() - now) / DAY_MS);
  if (daysLeft > 0 && daysLeft <= 180) {
    if (!nearestDeadline || daysLeft < nearestDeadline.daysLeft) {
      nearestDeadline = { ...dl, daysLeft };
    }
  }
}

// --- 4. Onboarding status + ambient org context (C2.1) ---
// The user-owned org dir (~/.claude/ms-ai-architect/org) wins; the legacy
// plugin org/ dir is the backward-compat fallback. Read the files once: their
// count drives the status line, their content drives the ambient summary that
// makes org context present in EVERY session (not just a "run onboarding" nudge).
function readOrgFiles(dir) {
  const files = {};
  let count = 0;
  if (existsSync(dir)) {
    for (const f of ORG_FILES) {
      const p = join(dir, f);
      if (existsSync(p)) {
        try {
          files[f] = readFileSync(p, 'utf8');
          count++;
        } catch {
          // Unreadable file — skip; advisory only
        }
      }
    }
    // Optional free-prose context (C2.2): read it for the ambient summary, but
    // do NOT count it — it is optional and must not affect onboarding completeness.
    const fp = join(dir, FREE_CONTEXT_FILE);
    if (existsSync(fp)) {
      try {
        files[FREE_CONTEXT_FILE] = readFileSync(fp, 'utf8');
      } catch {
        // Unreadable — skip; advisory only
      }
    }
  }
  return { files, count };
}
const userOrg = readOrgFiles(resolveOrgDir());
const orgData = userOrg.count > 0 ? userOrg : readOrgFiles(join(pluginRoot, 'org'));
const orgComplete = orgData.count;
const orgSummary = buildOrgSummary(orgData.files);

// --- 4. Build output ---
const parts = [];

if (activeUtredninger > 0) {
  parts.push(`${activeUtredninger} aktiv(e) utredning(er) i .work/`);
}
if (utredningFiles > 0) {
  parts.push(`${utredningFiles} utredningsdokument(er) i docs/`);
}

if (orgComplete === 0) {
  parts.push('Ingen virksomhetstilpasning. Kjør /architect:onboard (~5 min)');
} else if (orgComplete < ORG_FILES.length) {
  parts.push(`Onboarding ${orgComplete}/${ORG_FILES.length}. Kjør /architect:onboard for å fullføre`);
}

const staleEntries = [];
if (staleLevels.critical > 0) staleEntries.push(`${staleLevels.critical} critical`);
if (staleLevels.high > 0) staleEntries.push(`${staleLevels.high} high`);
if (staleLevels.medium > 0) staleEntries.push(`${staleLevels.medium} medium`);

if (staleEntries.length > 0) {
  const pollAge = lastPollDaysAgo < Infinity ? ` (pollet ${Math.floor(lastPollDaysAgo)}d siden)` : '';
  parts.push(`KB: ${staleEntries.join(', ')} needs update${pollAge}`);
} else if (lastPollDaysAgo > 7) {
  parts.push('KB: poll overdue');
}

// Skill-lifecycle signals (Spor B/C) — read-only one-liner; never spawns.
const skillReportPath = join(pluginRoot, 'scripts', 'kb-eval', 'data', 'skill-lifecycle-report.json');
if (existsSync(skillReportPath)) {
  try {
    const skillSummary = summarizeSkillLifecycle(JSON.parse(readFileSync(skillReportPath, 'utf8')));
    if (skillSummary) parts.push(skillSummary);
  } catch {
    // Ignore — advisory only
  }
}

// Course-detection signals (Spor C / C3.6) — read-only one-liner; never spawns.
// A lead is a signal that a topic exists, not auto-ingest: surfacing it here
// invites the operator to run /architect:kb-update §3c, which gates the lead
// into the courses ledger. Mirrors the skill-signaler block above.
const courseReportPath = join(pluginRoot, 'scripts', 'kb-update', 'data', 'course-detection-report.json');
if (existsSync(courseReportPath)) {
  try {
    const courseSummary = summarizeCourses(JSON.parse(readFileSync(courseReportPath, 'utf8')));
    if (courseSummary) parts.push(`${courseSummary}. Kjør /architect:kb-update`);
  } catch {
    // Ignore — advisory only
  }
}

// Skill-quality score signals (Spor D / Steg C) — read-only one-liner; never
// spawns, never scores live. Reads the CACHED skill-score-report.json (written
// by `score-skill.mjs --write`). The cache is gitignored => absent in a fresh
// clone, so this surfaces only for a maintainer who has produced it locally;
// summarizeSkillQuality tolerates the missing/malformed case → null.
const scoreCachePath = join(pluginRoot, 'scripts', 'kb-eval', 'data', 'skill-score-report.json');
if (existsSync(scoreCachePath)) {
  try {
    const qualitySummary = summarizeSkillQuality(JSON.parse(readFileSync(scoreCachePath, 'utf8')));
    if (qualitySummary) parts.push(qualitySummary);
  } catch {
    // Ignore — advisory only
  }
}

// KB-trust reporting floor (Spor 3 Port 3 / P3b) — read-only one-liner; never
// judges live. Reads the CACHED verified-staleness-report.json (written by
// report-verified-staleness.mjs on the KB-refresh cadence). Gitignored => absent
// in a fresh clone; summarizeTrustFreshness tolerates the missing/malformed case
// → null. Surfaces only drift + contract breaches (§4c — a floor, not a gate).
const stalenessCachePath = join(pluginRoot, 'scripts', 'kb-update', 'data', 'verified-staleness-report.json');
if (existsSync(stalenessCachePath)) {
  try {
    const trustSummary = summarizeTrustFreshness(JSON.parse(readFileSync(stalenessCachePath, 'utf8')));
    if (trustSummary) parts.push(trustSummary);
  } catch {
    // Ignore — advisory only
  }
}

if (nearestDeadline) {
  parts.push(`EU AI Act: ${nearestDeadline.daysLeft} dager til ${nearestDeadline.label}. Kjør /architect:classify`);
}

if (parts.length > 0) {
  lines.push(`Architect: ${parts.join('. ')}. /architect:help`);
} else {
  lines.push('Architect: Ingen aktive sesjoner. KB oppdatert. /architect:help');
}

// Ambient org context (C2.1): inject the compact summary so org facts are
// PRESENT in the session, not merely discoverable. Length-capped by
// buildOrgSummary. Only emitted when onboarding has produced content.
if (orgSummary) {
  lines.push('Virksomhetskontekst (auto-injisert fra ~/.claude/ms-ai-architect/org):');
  for (const l of orgSummary.split('\n')) lines.push(`- ${l}`);
}

if (lines.length > 0) {
  process.stdout.write(lines.join('\n') + '\n');
}

// --- Helpers ---

function countFiles(dir, filename) {
  let count = 0;
  try {
    const entries = readdirSync(dir, { withFileTypes: true });
    for (const entry of entries) {
      const fullPath = join(dir, entry.name);
      if (entry.isDirectory()) {
        count += countFiles(fullPath, filename);
      } else if (entry.name === filename) {
        count++;
      }
    }
  } catch {
    // Ignore permission errors
  }
  return count;
}