#!/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]

Env (recommandé):
  FORGE_API   = base API (LAN) ex: http://192.168.1.20:3000  (évite DNS)
  FORGE_BASE  = base web ex: https://gitea.xxx.tld
  FORGE_TOKEN = PAT (avec accès au 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>
`);
  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 CWD = process.cwd();
const CONTENT_ROOT = path.join(CWD, "src", "content");
const DIST_ROOT = path.join(CWD, "dist");

function normalizeText(s) {
  return String(s ?? "")
    .normalize("NFKD")
    .replace(/\p{Diacritic}/gu, "")
    .replace(/\s+/g, " ")
    .trim()
    .toLowerCase();
}

// stripping très pragmatique (anti-fragile > parfait)
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 run(cmd, args, opts = {}) {
  const r = spawnSync(cmd, args, { stdio: "inherit", ...opts });
  if (r.status !== 0) throw new Error(`Command failed: ${cmd} ${args.join(" ")}`);
}

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();
  // supports: https://host/owner/repo.git or ssh
  const m = u.match(/[:/](?<owner>[^/]+)\/(?<repo>[^/]+?)(?:\.git)?$/);
  if (!m?.groups) return null;
  return { owner: m.groups.owner, repo: m.groups.repo };
}

function pickLine(body, key) {
  // tolère espaces/indent
  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) {
  // ex: "## Chemin ..." ligne suivante contenant /...
  const re = new RegExp(`^##\\s*${escapeRegExp(headingKey)}[^\\n]*\\n([\\s\\S]*?)(?=\\n##\\s|\\n\\s*$)`, "mi");
  const m = body.match(re);
  if (!m) return "";
  // première ligne non vide et non commentée
  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) {
  // capture bloc après le 1er marker trouvé, jusqu'à un séparateur connu
  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);

  // stop markers (robuste)
  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) {
  // enlève ">" de citation markdown
  return String(s ?? "")
    .split(/\r?\n/)
    .map(l => l.replace(/^\s*>\s?/, ""))
    .join("\n")
    .trim();
}

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

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

  // supprime les outils "para-tools" si présents
  inner = inner.replace(/<span[^>]*class=["'][^"']*para-tools[^"']*["'][^>]*>[\s\S]*?<\/span>/gi, " ");

  // strip tags
  inner = inner.replace(/<[^>]+>/g, " ");
  inner = inner.replace(/\s+/g, " ").trim();

  // enlève artefacts éventuels
  inner = inner.replace(/\b(¶|Citer|Proposer|Copié)\b/gi, "").replace(/\s+/g, " ").trim();
  return inner;
}

function splitParagraphBlocks(mdxText) {
  // bloc = séparé par 2 sauts de ligne (pragmatique)
  const raw = mdxText.replace(/\r\n/g, "\n");
  const parts = raw.split(/\n{2,}/);
  return parts;
}

function bestBlockMatchIndex(blocks, targetText) {
  const tgt = normalizeText(stripMd(targetText));
  if (!tgt) return -1;

  // on compare par inclusion de snippet + score "overlap"
  const snippet = tgt.slice(0, Math.min(160, tgt.length));
  let best = { i: -1, score: -1 };

  for (let i = 0; i < blocks.length; i++) {
    const b = normalizeText(stripMd(blocks[i]));
    if (!b) continue;

    let score = 0;
    if (b.includes(snippet)) score += 1000; // jackpot

    // overlap par mots (cheap mais robuste)
    const words = new Set(tgt.split(" ").filter(w => w.length >= 4));
    let hit = 0;
    for (const w of words) if (b.includes(w)) hit++;
    score += hit;

    if (score > best.score) best = { i, score };
  }

  // seuil minimal : évite remplacement sauvage
  if (best.score < 20) return -1;
  return best.i;
}

async function findContentFileFromChemin(chemin) {
  const clean = 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("/"); // support nested
  const root = path.join(CONTENT_ROOT, collection);
  if (!(await fileExists(root))) return null;

  // cherche fichier dont le path relatif (sans ext) == slugPath
  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/1.0",
    }
  });
  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 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);
  }

  // API base: priorise LAN (FORGE_API), sinon FORGE_BASE
  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 title = issue.title || "";
  const bodyRaw = issue.body || "";
  const body = bodyRaw.replace(/\r\n/g, "\n");

  // Chemin / Ancre: support format "Chemin:" OU "## Chemin"
  let chemin = pickLine(body, "Chemin") || pickHeadingValue(body, "Chemin");
  let ancre  = pickLine(body, "Ancre") || pickHeadingValue(body, "Ancre paragraphe") || pickHeadingValue(body, "Ancre");
  ancre = ancre.trim();
  if (ancre.startsWith("#")) ancre = ancre.slice(1);

  // Texte actuel: support "Texte actuel (copie exacte...)" OU "Texte actuel (extrait)"
  const current1 = pickSection(body, ["Texte actuel (copie exacte du paragraphe)", "## Texte actuel (copie exacte du paragraphe)"]);
  const current2 = pickSection(body, ["Texte actuel (extrait)", "## Assertion / passage à vérifier", "Assertion / passage à vérifier"]);
  const texteActuel = unquoteBlock(current1 || current2);

  // Proposition: support 2 modèles
  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)}`);

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

  // texte cible: priorité au texte actuel du ticket, sinon récup HTML du paragraphe via ancre
  let targetText = texteActuel;
  if (!targetText) {
    if (await fileExists(distHtmlPath)) {
      const htmlText = await readHtmlParagraphText(distHtmlPath, ancre);
      if (htmlText) targetText = htmlText;
    }
  }
  if (!targetText) {
    throw new Error("Impossible de reconstruire le texte du paragraphe (ni texte actuel, ni dist html).");
  }

  // lecture + split blocs
  const original = await fs.readFile(contentFile, "utf-8");
  const blocks = splitParagraphBlocks(original);

  const idx = bestBlockMatchIndex(blocks, targetText);
  if (idx < 0) {
    console.error("❌ Match trop faible: je refuse de remplacer automatiquement.");
    console.error("➡️  Action: mets 'Texte actuel (copie exacte du paragraphe)' dans le ticket (recommandé).");
    process.exit(2);
  }

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

  // garde le style: 1 bloc -> 1 bloc
  const nextBlocks = blocks.slice();
  nextBlocks[idx] = afterBlock;

  const updated = nextBlocks.join("\n\n");

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

  // preview stats
  console.log(`🧩 Matched block #${idx+1}/${blocks.length} (backup: ${path.relative(CWD, bakPath)})`);

  if (DRY_RUN) {
    console.log("\n--- DRY RUN (no write) ---\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;
  }

  await fs.writeFile(contentFile, updated, "utf-8");
  console.log("✅ Applied. Next:");
  console.log(`  git diff -- ${path.relative(CWD, contentFile)}`);
  console.log(`  git add ${path.relative(CWD, contentFile)}`);
  console.log(`  git commit -m "edit: apply ticket #${issueNum} (${chemin}#${ancre})"`);
}

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