#!/usr/bin/env node
import fs from "node:fs/promises";
import path from "node:path";
import process from "node:process";
import { spawnSync } from "node:child_process";

function usage(exitCode = 0) {
  console.log(`
apply-ticket — applique une proposition de correction depuis un ticket Gitea (robuste)

Usage:
  node scripts/apply-ticket.mjs <issue_number> [--dry-run] [--no-build] [--alias] [--commit]

Flags:
  --dry-run   : ne modifie rien, affiche BEFORE/AFTER
  --no-build  : n'exécute pas "npm run build" (INCOMPATIBLE avec --alias)
  --alias     : après application, ajoute l'alias d'ancre (old -> new) dans src/anchors/anchor-aliases.json
  --commit    : git add + git commit automatiquement (inclut alias si --alias)

Env (recommandé):
  FORGE_API   = base API (LAN) ex: http://192.168.1.20:3000
  FORGE_BASE  = base web ex: https://gitea.xxx.tld
  FORGE_TOKEN = PAT (accès repo + issues)
  GITEA_OWNER = owner (optionnel si auto-détecté depuis git remote)
  GITEA_REPO  = repo  (optionnel si auto-détecté depuis git remote)

Notes:
  - Si dist/<chemin>/index.html est absent, le script lance "npm run build" sauf si --no-build.
  - Sauvegarde automatique: <fichier>.bak.issue-<N> (uniquement si on écrit)
  - Avec --alias : le script build pour obtenir le NOUVEL id, puis écrit l'alias old->new.
`);
  process.exit(exitCode);
}

const argv = process.argv.slice(2);
if (argv.length === 0 || argv.includes("--help") || argv.includes("-h")) usage(0);

const issueNum = Number(argv[0]);
if (!Number.isFinite(issueNum) || issueNum <= 0) {
  console.error("❌ Numéro de ticket invalide.");
  usage(1);
}

const DRY_RUN = argv.includes("--dry-run");
const NO_BUILD = argv.includes("--no-build");
const DO_ALIAS = argv.includes("--alias");
const DO_COMMIT = argv.includes("--commit");

if (DO_ALIAS && NO_BUILD) {
  console.error("❌ --alias est incompatible avec --no-build (risque d'alias faux).");
  console.error("➡️  Relance sans --no-build.");
  process.exit(1);
}

if (DRY_RUN && (DO_ALIAS || DO_COMMIT)) {
  console.warn("ℹ️ --dry-run : --alias/--commit sont ignorés (aucune écriture).");
}

if (typeof fetch !== "function") {
  console.error("❌ fetch() indisponible dans ce Node. Utilise Node 18+ (ou plus).");
  process.exit(1);
}

const CWD = process.cwd();
const CONTENT_ROOT = path.join(CWD, "src", "content");
const DIST_ROOT = path.join(CWD, "dist");
const ALIASES_FILE = path.join(CWD, "src", "anchors", "anchor-aliases.json");

function normalizeText(s) {
  return String(s ?? "")
    .normalize("NFKD")
    .replace(/\p{Diacritic}/gu, "")
    .replace(/[’‘]/g, "'")
    .replace(/[“”]/g, '"')
    .replace(/[–—]/g, "-")
    .replace(/…/g, "...")
    .replace(/\s+/g, " ")
    .trim()
    .toLowerCase();
}

// stripping très pragmatique
function stripMd(mdx) {
  let s = String(mdx ?? "");
  s = s.replace(/`[^`]*`/g, " ");              // inline code
  s = s.replace(/!\[[^\]]*\]\([^)]+\)/g, " "); // images
  s = s.replace(/\[[^\]]*\]\([^)]+\)/g, " ");  // links
  s = s.replace(/[*_~]/g, " ");                // emphasis-ish
  s = s.replace(/<[^>]+>/g, " ");              // html tags
  s = s.replace(/\s+/g, " ").trim();
  return s;
}

function tokenize(s) {
  const n = normalizeText(stripMd(s));
  return n
    .replace(/[^a-z0-9'\- ]+/g, " ")
    .split(" ")
    .filter((w) => w.length >= 4);
}

function run(cmd, args, opts = {}) {
  const r = spawnSync(cmd, args, { stdio: "inherit", ...opts });
  if (r.error) throw r.error;
  if (r.status !== 0) throw new Error(`Command failed: ${cmd} ${args.join(" ")}`);
}

function runQuiet(cmd, args, opts = {}) {
  const r = spawnSync(cmd, args, { encoding: "utf8", stdio: "pipe", ...opts });
  if (r.error) throw r.error;
  if (r.status !== 0) {
    const out = (r.stdout || "") + (r.stderr || "");
    throw new Error(`Command failed: ${cmd} ${args.join(" ")}\n${out}`);
  }
  return r.stdout || "";
}

async function fileExists(p) {
  try { await fs.access(p); return true; } catch { return false; }
}

function getEnv(name, fallback = "") {
  return (process.env[name] ?? fallback).trim();
}

function inferOwnerRepoFromGit() {
  const r = spawnSync("git", ["remote", "get-url", "origin"], { encoding: "utf-8" });
  if (r.status !== 0) return null;
  const u = (r.stdout || "").trim();
  const m = u.match(/[:/](?<owner>[^/]+)\/(?<repo>[^/]+?)(?:\.git)?$/);
  if (!m?.groups) return null;
  return { owner: m.groups.owner, repo: m.groups.repo };
}

function escapeRegExp(s) {
  return String(s).replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
}

function pickLine(body, key) {
  const re = new RegExp(`^\\s*${escapeRegExp(key)}\\s*:\\s*([^\\n\\r]+)`, "mi");
  const m = body.match(re);
  return m ? m[1].trim() : "";
}

function pickHeadingValue(body, headingKey) {
  const re = new RegExp(`^##\\s*${escapeRegExp(headingKey)}[^\\n]*\\n([\\s\\S]*?)(?=\\n##\\s|\\n\\s*$)`, "mi");
  const m = body.match(re);
  if (!m) return "";
  const lines = m[1].split(/\r?\n/).map(l => l.trim());
  for (const l of lines) {
    if (!l) continue;
    if (l.startsWith("<!--")) continue;
    return l.replace(/^\/?/, "/").trim();
  }
  return "";
}

function pickSection(body, markers) {
  const text = body.replace(/\r\n/g, "\n");
  const idx = markers
    .map(m => ({ m, i: text.toLowerCase().indexOf(m.toLowerCase()) }))
    .filter(x => x.i >= 0)
    .sort((a, b) => a.i - b.i)[0];
  if (!idx) return "";
  const start = idx.i + idx.m.length;
  const tail = text.slice(start);

  const stops = [
    "\n## ", "\nJustification", "\n---", "\n## Justification", "\n## Sources",
    "\nProblème identifié", "\nSources proposées", "\n## Proposition", "\n## Problème"
  ];
  let end = tail.length;
  for (const s of stops) {
    const j = tail.toLowerCase().indexOf(s.toLowerCase());
    if (j >= 0 && j < end) end = j;
  }
  return tail.slice(0, end).trim();
}

function unquoteBlock(s) {
  return String(s ?? "")
    .split(/\r?\n/)
    .map(l => l.replace(/^\s*>\s?/, ""))
    .join("\n")
    .trim();
}

async function readHtmlParagraphText(htmlPath, anchorId) {
  const html = await fs.readFile(htmlPath, "utf-8");
  const re = new RegExp(`<p[^>]*\\bid=["']${escapeRegExp(anchorId)}["'][^>]*>([\\s\\S]*?)<\\/p>`, "i");
  const m = html.match(re);
  if (!m) return "";
  return cleanHtmlInner(m[1]);
}

function cleanHtmlInner(inner) {
  let s = String(inner ?? "");
  s = s.replace(/<span[^>]*class=["'][^"']*para-tools[^"']*["'][^>]*>[\s\S]*?<\/span>/gi, " ");
  s = s.replace(/<[^>]+>/g, " ");
  s = s.replace(/\s+/g, " ").trim();
  s = s.replace(/\b(¶|Citer|Proposer|Copié)\b/gi, "").replace(/\s+/g, " ").trim();
  return s;
}

async function readAllHtmlParagraphs(htmlPath) {
  const html = await fs.readFile(htmlPath, "utf-8");
  const out = [];
  const re = /<p\b[^>]*\sid=["'](p-\d+-[0-9a-f]{8})["'][^>]*>([\s\S]*?)<\/p>/gi;
  let m;
  while ((m = re.exec(html))) {
    out.push({ id: m[1], text: cleanHtmlInner(m[2]) });
  }
  return out;
}

function splitParagraphBlocks(mdxText) {
  const raw = mdxText.replace(/\r\n/g, "\n");
  return raw.split(/\n{2,}/);
}

function isLikelyExcerpt(s) {
  const t = String(s || "").trim();
  if (!t) return true;
  if (t.length < 120) return true;
  if (/[.…]$/.test(t)) return true;
  if (t.includes("tronqu")) return true;
  return false;
}

function scoreText(candidate, targetText) {
  const tgt = tokenize(targetText);
  const blk = tokenize(candidate);
  if (!tgt.length || !blk.length) return 0;

  const tgtSet = new Set(tgt);
  const blkSet = new Set(blk);

  let hit = 0;
  for (const w of tgtSet) if (blkSet.has(w)) hit++;

  const tgtNorm = normalizeText(stripMd(targetText));
  const blkNorm = normalizeText(stripMd(candidate));
  const prefix = tgtNorm.slice(0, Math.min(180, tgtNorm.length));
  const prefixBonus = prefix && blkNorm.includes(prefix) ? 1000 : 0;

  const ratio = hit / Math.max(1, tgtSet.size);
  const ratioBonus = Math.round(ratio * 100);

  return prefixBonus + hit + ratioBonus;
}

function bestBlockMatchIndex(blocks, targetText) {
  let best = { i: -1, score: -1 };
  for (let i = 0; i < blocks.length; i++) {
    const sc = scoreText(blocks[i], targetText);
    if (sc > best.score) best = { i, score: sc };
  }
  return best;
}

function normalizeChemin(chemin) {
  let c = String(chemin || "").trim();
  if (!c.startsWith("/")) c = "/" + c;
  if (!c.endsWith("/")) c = c + "/";
  return c;
}

async function findContentFileFromChemin(chemin) {
  const clean = normalizeChemin(chemin).replace(/^\/+|\/+$/g, "");
  const parts = clean.split("/").filter(Boolean);
  if (parts.length < 2) return null;
  const collection = parts[0];
  const slugPath = parts.slice(1).join("/");
  const root = path.join(CONTENT_ROOT, collection);
  if (!(await fileExists(root))) return null;

  const exts = [".mdx", ".md"];
  async function walk(dir) {
    const entries = await fs.readdir(dir, { withFileTypes: true });
    for (const e of entries) {
      const full = path.join(dir, e.name);
      if (e.isDirectory()) {
        const r = await walk(full);
        if (r) return r;
      } else {
        for (const ext of exts) {
          if (e.name.endsWith(ext)) {
            const rel = path.relative(root, full).replace(/\\/g, "/");
            const relNoExt = rel.slice(0, -ext.length);
            if (relNoExt === slugPath) return full;
          }
        }
      }
    }
    return null;
  }
  return await walk(root);
}

async function ensureBuildIfNeeded(distHtmlPath) {
  if (NO_BUILD) return;
  if (await fileExists(distHtmlPath)) return;

  console.log("ℹ️  dist manquant pour cette page → build (npm run build) …");
  run("npm", ["run", "build"], { cwd: CWD });
  if (!(await fileExists(distHtmlPath))) {
    throw new Error(`dist toujours introuvable après build: ${distHtmlPath}`);
  }
}

async function fetchIssue({ forgeApiBase, owner, repo, token, issueNum }) {
  const url = `${forgeApiBase.replace(/\/+$/,"")}/api/v1/repos/${owner}/${repo}/issues/${issueNum}`;
  const res = await fetch(url, {
    headers: {
      "Authorization": `token ${token}`,
      "Accept": "application/json",
      "User-Agent": "archicratie-apply-ticket/1.2",
    }
  });
  if (!res.ok) {
    const t = await res.text().catch(()=> "");
    throw new Error(`HTTP ${res.status} fetching issue: ${url}\n${t}`);
  }
  return await res.json();
}

async function loadAliases() {
  try {
    const s = await fs.readFile(ALIASES_FILE, "utf8");
    const obj = JSON.parse(s);
    return obj && typeof obj === "object" ? obj : {};
  } catch {
    return {};
  }
}

function sortObjectKeys(obj) {
  return Object.fromEntries(Object.keys(obj).sort().map((k) => [k, obj[k]]));
}

async function saveAliases(obj) {
  let out = obj || {};
  // tri stable
  for (const k of Object.keys(out)) {
    if (out[k] && typeof out[k] === "object") out[k] = sortObjectKeys(out[k]);
  }
  out = sortObjectKeys(out);

  await fs.mkdir(path.dirname(ALIASES_FILE), { recursive: true });
  await fs.writeFile(ALIASES_FILE, JSON.stringify(out, null, 2) + "\n", "utf8");
}

async function upsertAlias({ chemin, oldId, newId }) {
  const route = normalizeChemin(chemin);
  if (!oldId || !newId) throw new Error("Alias: oldId/newId requis");
  if (oldId === newId) return { changed: false, reason: "same" };

  const data = await loadAliases();
  if (!data[route]) data[route] = {};

  const prev = data[route][oldId];
  if (prev && prev !== newId) {
    throw new Error(`Alias conflict: ${route}${oldId} already mapped to ${prev} (new=${newId})`);
  }
  if (prev === newId) return { changed: false, reason: "already" };

  data[route][oldId] = newId;
  await saveAliases(data);
  return { changed: true, reason: "written" };
}

function gitHasStagedChanges() {
  const r = spawnSync("git", ["diff", "--cached", "--quiet"]);
  return r.status === 1;
}

async function computeNewIdFromDistByContent(distHtmlPath, afterBlock) {
  const paras = await readAllHtmlParagraphs(distHtmlPath);
  if (!paras.length) throw new Error(`Aucun <p id="p-..."> trouvé dans ${distHtmlPath}`);

  let best = { id: null, score: -1, text: "" };
  const target = stripMd(afterBlock).slice(0, 1200);

  for (const p of paras) {
    const sc = scoreText(p.text, target);
    if (sc > best.score) best = { id: p.id, score: sc, text: p.text };
  }

  // seuil de sécurité (évite alias faux)
  if (!best.id || best.score < 60) {
    throw new Error(
      `Impossible d'identifier le nouvel id dans dist (score trop faible: ${best.score}).\n` +
      `➡️ Vérifie que la proposition correspond bien à UN paragraphe.`
    );
  }

  return best.id;
}

async function main() {
  const token = getEnv("FORGE_TOKEN");
  if (!token) {
    console.error("❌ FORGE_TOKEN manquant (PAT). Ex: export FORGE_TOKEN='...'");
    process.exit(1);
  }

  const inferred = inferOwnerRepoFromGit() || {};
  const owner = getEnv("GITEA_OWNER", inferred.owner || "");
  const repo  = getEnv("GITEA_REPO", inferred.repo || "");
  if (!owner || !repo) {
    console.error("❌ Impossible de déterminer owner/repo. Fix: export GITEA_OWNER=... GITEA_REPO=...");
    process.exit(1);
  }

  const forgeApiBase = getEnv("FORGE_API") || getEnv("FORGE_BASE");
  if (!forgeApiBase) {
    console.error("❌ FORGE_API ou FORGE_BASE manquant. Ex: export FORGE_API='http://192.168.1.20:3000'");
    process.exit(1);
  }

  console.log(`🔎 Fetch ticket #${issueNum} from ${owner}/${repo} …`);
  const issue = await fetchIssue({ forgeApiBase, owner, repo, token, issueNum });

  const body = String(issue.body || "").replace(/\r\n/g, "\n");

  let chemin = pickLine(body, "Chemin") || pickHeadingValue(body, "Chemin");
  let ancre  = pickLine(body, "Ancre") || pickHeadingValue(body, "Ancre paragraphe") || pickHeadingValue(body, "Ancre");
  chemin = normalizeChemin(chemin);
  ancre = (ancre || "").trim();
  if (ancre.startsWith("#")) ancre = ancre.slice(1);

  const currentFull = pickSection(body, ["Texte actuel (copie exacte du paragraphe)", "## Texte actuel (copie exacte du paragraphe)"]);
  const currentEx  = pickSection(body, ["Texte actuel (extrait)", "## Assertion / passage à vérifier", "Assertion / passage à vérifier"]);
  const texteActuel = unquoteBlock(currentFull || currentEx);

  const prop1 = pickSection(body, ["Proposition (texte corrigé complet)", "## Proposition (texte corrigé complet)"]);
  const prop2 = pickSection(body, ["Proposition (remplacer par):", "## Proposition (remplacer par)"]);
  const proposition = (prop1 || prop2).trim();

  if (!chemin) throw new Error("Ticket: Chemin introuvable dans le body.");
  if (!ancre) throw new Error("Ticket: Ancre introuvable dans le body.");
  if (!proposition) throw new Error("Ticket: Proposition introuvable dans le body.");

  console.log("✅ Parsed:", { chemin, ancre: `#${ancre}`, hasTexteActuel: Boolean(texteActuel) });

  const contentFile = await findContentFileFromChemin(chemin);
  if (!contentFile) throw new Error(`Fichier contenu introuvable pour Chemin=${chemin}`);
  console.log(`📄 Target content file: ${path.relative(CWD, contentFile)}`);

  const distHtmlPath = path.join(DIST_ROOT, chemin.replace(/^\/+|\/+$/g,""), "index.html");
  await ensureBuildIfNeeded(distHtmlPath);

  // targetText: préférence au texte complet (ticket), sinon dist si extrait probable
  let targetText = texteActuel;

  let distText = "";
  if (await fileExists(distHtmlPath)) {
    distText = await readHtmlParagraphText(distHtmlPath, ancre);
  }

  if (!targetText && distText) targetText = distText;
  if (targetText && distText && isLikelyExcerpt(targetText) && distText.length > targetText.length) {
    targetText = distText;
  }

  if (!targetText) {
    throw new Error("Impossible de reconstruire le texte du paragraphe (ni texte actuel, ni dist html).");
  }

  const original = await fs.readFile(contentFile, "utf-8");
  const blocks = splitParagraphBlocks(original);

  const best = bestBlockMatchIndex(blocks, targetText);

  // seuil de sécurité
  if (best.i < 0 || best.score < 40) {
    console.error("❌ Match trop faible: je refuse de remplacer automatiquement.");
    console.error(`➡️  Score=${best.score}. Recommandation: ticket avec 'Texte actuel (copie exacte du paragraphe)'.`);
    const ranked = blocks
      .map((b, i) => ({ i, score: scoreText(b, targetText), excerpt: stripMd(b).slice(0, 140) }))
      .sort((a, b) => b.score - a.score)
      .slice(0, 5);

    console.error("Top candidates:");
    for (const r of ranked) {
      console.error(`  #${r.i + 1} score=${r.score}  ${r.excerpt}${r.excerpt.length >= 140 ? "…" : ""}`);
    }
    process.exit(2);
  }

  const beforeBlock = blocks[best.i];
  const afterBlock = proposition.trim();

  const nextBlocks = blocks.slice();
  nextBlocks[best.i] = afterBlock;
  const updated = nextBlocks.join("\n\n");

  console.log(`🧩 Matched block #${best.i + 1}/${blocks.length} score=${best.score}`);

  if (DRY_RUN) {
    console.log("\n--- DRY RUN (no write, no backup) ---\n");
    console.log("=== BEFORE (excerpt) ===");
    console.log(beforeBlock.slice(0, 400) + (beforeBlock.length > 400 ? "…" : ""));
    console.log("\n=== AFTER (excerpt) ===");
    console.log(afterBlock.slice(0, 400) + (afterBlock.length > 400 ? "…" : ""));
    console.log("\n✅ Dry-run terminé.");
    return;
  }

  // backup uniquement si on écrit
  const bakPath = `${contentFile}.bak.issue-${issueNum}`;
  if (!(await fileExists(bakPath))) {
    await fs.writeFile(bakPath, original, "utf-8");
  }

  await fs.writeFile(contentFile, updated, "utf-8");
  console.log("✅ Applied.");

  let aliasChanged = false;
  let newId = null;

  if (DO_ALIAS) {
    console.log("🔁 Rebuild to compute new anchor ids (npm run build) …");
    run("npm", ["run", "build"], { cwd: CWD });

    if (!(await fileExists(distHtmlPath))) {
      throw new Error(`dist introuvable après build: ${distHtmlPath}`);
    }

    newId = await computeNewIdFromDistByContent(distHtmlPath, afterBlock);

    const res = await upsertAlias({ chemin, oldId: ancre, newId });
    aliasChanged = res.changed;

    if (aliasChanged) {
      console.log(`✅ Alias ajouté: ${chemin} ${ancre} -> ${newId}`);
      // met à jour dist immédiatement (sans rebuild complet)
      run("node", ["scripts/inject-anchor-aliases.mjs"], { cwd: CWD });
    } else {
      console.log(`ℹ️ Alias déjà présent ou inutile (${ancre} -> ${newId}).`);
    }

    // garde-fous rapides
    run("npm", ["run", "test:anchors"], { cwd: CWD });
    run("node", ["scripts/check-inline-js.mjs"], { cwd: CWD });
  }

  if (DO_COMMIT) {
    const files = [path.relative(CWD, contentFile)];
    if (DO_ALIAS && aliasChanged) files.push(path.relative(CWD, ALIASES_FILE));

    run("git", ["add", ...files], { cwd: CWD });

    if (!gitHasStagedChanges()) {
      console.log("ℹ️ Nothing to commit (aucun changement staged).");
      return;
    }

    const msg = `edit: apply ticket #${issueNum} (${chemin}#${ancre})`;
    run("git", ["commit", "-m", msg], { cwd: CWD });
    console.log(`✅ Committed: ${msg}`);
    return;
  }

  // mode manuel (historique)
  console.log("Next (manuel) :");
  console.log(`  git diff -- ${path.relative(CWD, contentFile)}`);
  console.log(`  git add ${path.relative(CWD, contentFile)}${DO_ALIAS ? " src/anchors/anchor-aliases.json" : ""}`);
  console.log(`  git commit -m "edit: apply ticket #${issueNum} (${chemin}#${ancre})"`);
}

main().catch((e) => {
  console.error("💥", e?.message || e);
  process.exit(1);
});