/**
 * deployTools.ts — G-05: Deploy Connectors (CF Pages diretta)
 *
 * Tool `cf_pages_status`: chiama la CF Pages API DIRETTAMENTE dal browser,
 * senza passare per il backend HF Space (che può essere freddo/down).
 *
 * Usa VITE_CF_API_TOKEN + VITE_CF_ACCOUNT_ID iniettati al build time
 * (già presenti in vite.config.ts come injection targets).
 *
 * Completa `check_deploy` (che richiede backend up) con un fallback robusto.
 *
 * @module deployTools
 */

import { makeTimedSignal } from "./networkConstants";
// GAP-C: import ErrorSignatureBuilder for deterministic error parsing in loop
import { buildErrorSignature } from "./errorSignatureBuilder";

const CF_BASE = "https://api.cloudflare.com/client/v4";

function cfHeaders(): { Authorization: string; "Content-Type": string } | null {
  const token     = (import.meta.env.VITE_CF_API_TOKEN  ?? "") as string;
  const accountId = (import.meta.env.VITE_CF_ACCOUNT_ID ?? "") as string;
  if (!token || !accountId) return null;
  return {
    "Authorization": `Bearer ${token}`,
    "Content-Type":  "application/json",
  };
}

function cfAccountId(): string {
  return (import.meta.env.VITE_CF_ACCOUNT_ID ?? "") as string;
}

/** Emoji e label per lo stato CF Pages */
function stageIcon(status: string): string {
  if (status === "success")  return "✅";
  if (status === "failure" || status === "failed") return "❌";
  if (status === "active")   return "🔄";
  if (status === "skipped")  return "⏭️";
  return "⏳";
}

// ─── cf_pages_status ─────────────────────────────────────────────────────────

export async function handleCfPagesStatus(args: {
  project_name?: string;
  show_logs?:    boolean;
}): Promise<string> {
  const headers = cfHeaders();
  if (!headers) {
    return [
      "❌ **cf_pages_status**: credenziali Cloudflare non configurate.",
      "Aggiungi `CF_API_TOKEN` e `CF_ACCOUNT_ID` nei secrets del progetto CF Pages.",
      "I valori vengono iniettati da `vite.config.ts` al momento del build.",
    ].join("\n");
  }

  const accountId   = cfAccountId();
  const projectName = (args.project_name ?? "agente-ai").trim();
  const BASE        = `${CF_BASE}/accounts/${accountId}/pages/projects`;
  const sig         = makeTimedSignal(12_000);

  try {
    // ── 1. Ottieni ultimi 5 deployment ───────────────────────────────────────
    const deployRes = await fetch(
      `${BASE}/${projectName}/deployments?per_page=5`,
      { headers, signal: sig },
    );

    if (!deployRes.ok) {
      if (deployRes.status === 404) {
        // Prova a listare i progetti disponibili
        const projRes = await fetch(BASE, { headers, signal: makeTimedSignal(8_000) });
        if (projRes.ok) {
          const proj = await projRes.json() as { result?: { name: string }[] };
          const names = (proj.result ?? []).map(p => p.name).join(", ");
          return `❌ Progetto "${projectName}" non trovato su CF Pages.\n📋 Progetti disponibili: ${names || "(nessuno)"}`;
        }
      }
      const body = await deployRes.text().catch(() => "");
      return `❌ CF Pages API HTTP ${deployRes.status}: ${body.slice(0, 200)}`;
    }

    const data = await deployRes.json() as {
      result?: Array<{
        id:          string;
        created_on:  string;
        url?:        string;
        aliases?:    string[];
        stages?:     Array<{ name: string; status: string; started_on?: string; ended_on?: string }>;
        latest_stage?: { name: string; status: string };
        build_config?: { build_command?: string };
        deployment_trigger?: { type: string };
      }>;
    };

    const deployments = data.result ?? [];
    if (deployments.length === 0) {
      return `ℹ️ Nessun deployment trovato per "${projectName}".`;
    }

    const latest  = deployments[0];
    const status  = latest.latest_stage?.status ?? latest.stages?.at(-1)?.status ?? "unknown";
    const liveUrl = latest.aliases?.[0] ?? latest.url ?? "";
    const createdAt = new Date(latest.created_on).toLocaleString("it-IT", {
      day: "2-digit", month: "short", hour: "2-digit", minute: "2-digit",
    });
    const trigger = latest.deployment_trigger?.type === "github" ? "push GitHub" :
                    latest.deployment_trigger?.type === "api"    ? "API trigger" : "manuale";

    const lines: string[] = [
      `${stageIcon(status)} **CF Pages — \`${projectName}\`**`,
      `📅 ${createdAt}  ·  trigger: ${trigger}`,
      `🏷️ Stato: \`${status}\``,
      liveUrl ? `🌐 ${liveUrl}` : "",
      "",
    ];

    // Stadi build con durata
    const stages = latest.stages ?? [];
    if (stages.length > 0) {
      lines.push("**Stadi:**");
      for (const s of stages) {
        const dur = s.started_on && s.ended_on
          ? ` (${Math.round((+new Date(s.ended_on) - +new Date(s.started_on)) / 1000)}s)`
          : "";
        lines.push(`  ${stageIcon(s.status)} \`${s.name}\`${dur}`);
      }
      lines.push("");
    }

    // Cronologia recente
    if (deployments.length > 1) {
      lines.push("**Ultimi deployment:**");
      for (const d of deployments.slice(0, 4)) {
        const st  = d.latest_stage?.status ?? "?";
        const dt  = new Date(d.created_on).toLocaleString("it-IT", { day:"2-digit", month:"short", hour:"2-digit", minute:"2-digit" });
        lines.push(`  ${stageIcon(st)} ${dt} — \`${st}\`  [${d.id.slice(0, 8)}]`);
      }
    }

    return lines.filter((l, i) => l !== "" || i !== lines.length - 1).join("\n");

  } catch (e) {
    if (e instanceof Error && e.name === "TimeoutError") {
      return "⏱️ cf_pages_status: timeout (CF API >12s). Riprova tra qualche secondo.";
    }
    return `❌ cf_pages_status: ${String(e).slice(0, 250)}`;
  }
}

// ─── deploy_and_verify ─────────────────────────────────────────────────────
/**
 * Fix B: Polls CF Pages build status until success/failure or timeout.
 * Chiamato DOPO un git_push che trigga un deployment CF Pages.
 * NON avvia un nuovo deploy — monitora quello già in corso.
 *
 * @param args.project_name  CF Pages project (default: "agente-ai")
 * @param args.timeout_s     Max attesa in secondi (default: 90, max: 180)
 */
export async function handleDeployAndVerify(args: {
  project_name?: string;
  timeout_s?:    number;
}): Promise<string> {
  const headers = cfHeaders();
  if (!headers) {
    return [
      "❌ **deploy_and_verify**: credenziali CF non configurate.",
      "Aggiungi `CF_API_TOKEN` e `CF_ACCOUNT_ID` nei secrets.",
    ].join("\n");
  }

  const projectName = (args.project_name ?? "agente-ai").trim();
  const maxMs       = Math.min((args.timeout_s ?? 90), 180) * 1_000;
  const pollMs      = 6_000;
  const start       = Date.now();
  let   attempt     = 0;

  // eslint-disable-next-line no-constant-condition
  while (true) {
    attempt++;
    const snap    = await handleCfPagesStatus({ project_name: projectName });
    const elapsed = Math.round((Date.now() - start) / 1_000);
    const firstLine = snap.split("\n")[0] ?? "";

    if (firstLine.includes("✅")) {
      return `✅ **deploy_and_verify**: build completata in ${elapsed}s (${attempt} poll).\n\n${snap}`;
    }
    if (firstLine.includes("❌")) {
      return `❌ **deploy_and_verify**: build fallita dopo ${elapsed}s.\n\n${snap}`;
    }

    if (Date.now() - start + pollMs > maxMs) {
      return `⏱️ **deploy_and_verify**: timeout ${args.timeout_s ?? 90}s — build ancora in corso.\n\nUltimo stato:\n${snap.slice(0, 500)}`;
    }

    await new Promise<void>(r => setTimeout(r, pollMs));
  }
}

// ─── auto_deploy_loop ──────────────────────────────────────────────────────────
/**
 * GAP-C v2: Deploy loop corretto — single-shot, stateless.
 *
 * Una chiamata = un tentativo. Dopo un fallimento ritorna gli errori strutturati
 * + istruzioni esplicite all'agente LLM per applicare il fix e richiamare.
 *
 * Flusso corretto:
 *   Chiamata 1 (attempt=1, monitor_only=false):
 *     trigger deploy → poll → se fallisce → ritorna errori → STOP
 *   Agente: legge errori → applica fix → git_push (trigga CF Pages da solo)
 *   Chiamata 2 (attempt=2, monitor_only=true):
 *     monitora nuovo deploy → se fallisce → ritorna errori → STOP
 *   ...fino a attempt === max_attempts
 *
 * Bug rimosso: il for loop interno ritriggerava il deploy senza che l'agente
 * avesse applicato nessun fix — ogni tentativo riceveva lo stesso codice rotto.
 *
 * @param args.attempt      Tentativo corrente 1-based (default 1). L'agente incrementa.
 * @param args.monitor_only true sui retry: il git_push ha già triggerato CF Pages.
 */
export async function handleAutoDeployLoop(args: {
  project_name?:  string;
  timeout_s?:     number;
  max_attempts?:  number;
  monitor_only?:  boolean;
  /** Tentativo corrente 1-based. L'agente lo incrementa ad ogni retry dopo un fix. */
  attempt?:       number;
}): Promise<string> {
  const headers = cfHeaders();
  if (!headers) {
    return [
      "❌ **auto_deploy_loop**: credenziali CF non configurate.",
      "Aggiungi VITE_CF_API_TOKEN e VITE_CF_ACCOUNT_ID nei secrets CF Pages.",
    ].join("\n");
  }

  const projectName = (args.project_name ?? "agente-ai").trim();
  const maxAttempts = Math.min(args.max_attempts ?? 3, 5);
  const attempt     = Math.max(args.attempt ?? 1, 1);
  const accountId   = cfAccountId();
  const BASE        = `${CF_BASE}/accounts/${accountId}/pages/projects`;

  const lines: string[] = [
    `🔁 **auto_deploy_loop** — \`${projectName}\` — tentativo ${attempt}/${maxAttempts}`,
  ];

  // ── Step 1: Trigger (solo se !monitor_only) ──────────────────────────────
  // Sui retry NON si triggera: il git_push ha già avviato un nuovo CF deployment.
  if (!args.monitor_only) {
    try {
      const triggerRes = await fetch(
        `${BASE}/${projectName}/deployments`,
        { method: "POST", headers, signal: makeTimedSignal(10_000) },
      );
      if (triggerRes.ok) {
        const tData = await triggerRes.json() as { result?: { id?: string } };
        lines.push(`⚡ Deploy triggerato: ID ${tData.result?.id ?? "?"}`);
      } else if (triggerRes.status === 400) {
        lines.push(`ℹ️ Nessun nuovo commit — monitoro deployment corrente`);
      } else {
        lines.push(`⚠️ Trigger HTTP ${triggerRes.status} — monitoro deployment corrente`);
      }
    } catch {
      lines.push(`⚠️ Trigger fallito — monitoro deployment corrente`);
    }
  } else {
    lines.push(`👁️ monitor_only — monitoro deployment avviato dal git_push`);
  }

  // ── Step 2: Poll fino a success/failure ─────────────────────────────────
  const pollResult = await handleDeployAndVerify({
    project_name: projectName,
    timeout_s:    args.timeout_s ?? 90,
  });
  lines.push(pollResult);

  // ── Step 3a: Successo ────────────────────────────────────────────────────
  if (pollResult.startsWith("✅")) {
    lines.push(`\n✅ **auto_deploy_loop**: deploy completato al tentativo ${attempt}/${maxAttempts}.`);
    return lines.join("\n");
  }

  // ── Step 3b: Timeout — build ancora in corso ─────────────────────────────
  if (pollResult.startsWith("⏱️")) {
    lines.push([
      `\n⏱️ **auto_deploy_loop**: build ancora in corso dopo ${args.timeout_s ?? 90}s.`,
      `📋 Richiama con \`monitor_only: true, attempt: ${attempt}, max_attempts: ${maxAttempts}\` per continuare il monitoring.`,
    ].join("\n"));
    return lines.join("\n");
  }

  // ── Step 3c: Build fallita — estrai errori e RITORNA SENZA RETRY ─────────
  // Il loop NON riesegue qui. L'agente deve:
  //   1. Leggere gli errori sotto
  //   2. Applicare i fix (git_push con le correzioni)
  //   3. Richiamare auto_deploy_loop con monitor_only:true, attempt:N+1

  let buildErrors = "";
  let errorSig    = "";
  try {
    const depRes = await fetch(
      `${BASE}/${projectName}/deployments?per_page=1`,
      { headers, signal: makeTimedSignal(8_000) },
    );
    if (depRes.ok) {
      const depData = await depRes.json() as {
        result?: Array<{ id: string; stages?: Array<{ name: string; status: string }> }>
      };
      const latestId = depData.result?.[0]?.id;
      if (latestId) {
        const logRes = await fetch(
          `${BASE}/${projectName}/deployments/${latestId}/history/logs?size=100`,
          { headers, signal: makeTimedSignal(8_000) },
        );
        if (logRes.ok) {
          const logData = await logRes.json() as {
            result?: { logs?: Array<{ message: string; level?: string }> }
          };
          const allLogs = (logData.result?.logs ?? []).map(l => l.message).join("\n");
          const errorLines = allLogs
            .split("\n")
            .filter(l =>
              l.includes("error TS") ||
              l.includes("ERROR") ||
              l.includes("Build failed") ||
              l.includes("Cannot find") ||
              l.includes("Type error") ||
              (/\(\d+,\d+\)/.test(l) && l.includes("error")),
            )
            .slice(0, 20)
            .join("\n");
          if (errorLines.trim()) {
            buildErrors = errorLines;
            errorSig    = JSON.stringify(buildErrorSignature(errorLines, "deploy_monitor", {}, 0, 0));
          }
        }
      }
    }
  } catch { /* non-fatal — continuiamo senza errori estratti */ }

  if (buildErrors) {
    lines.push(`\n🔍 **Build errors (tentativo ${attempt})**:\n\`\`\`\n${buildErrors}\n\`\`\``);
    if (errorSig) lines.push(`🔑 Error signature: \`${errorSig}\``);
  } else {
    lines.push(`\n🔍 Nessun errore TypeScript estratto — controlla la pipeline CF Pages manualmente.`);
  }

  // ── Step 4: Istruzioni precise per l'agente LLM ──────────────────────────
  if (attempt < maxAttempts) {
    lines.push([
      `\n⚠️ **auto_deploy_loop**: build fallita — tentativo ${attempt}/${maxAttempts}.`,
      ``,
      `📋 **Prossimi passi (in ordine):**`,
      `  1. Analizza e correggi gli errori sopra nei file indicati`,
      `  2. Usa \`git_push\` per pushare le correzioni (trigga CF Pages automaticamente)`,
      `  3. Richiama \`auto_deploy_loop\` con:`,
      `     \`monitor_only: true\`  ← non ritriggerare, il push ha già avviato il deploy`,
      `     \`attempt: ${attempt + 1}\``,
      `     \`max_attempts: ${maxAttempts}\``,
    ].join("\n"));
  } else {
    lines.push([
      `\n❌ **auto_deploy_loop**: max tentativi raggiunti (${attempt}/${maxAttempts}).`,
      `Intervento manuale necessario — controlla la pipeline CF Pages.`,
    ].join("\n"));
  }

  return lines.join("\n");
}