import { spawnSync } from "node:child_process";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { compareDeploymentCommits, isRunningContainer } from "./deployment-proof-state.mjs";

const baseUrl = process.env.PROJECTBRAIN_DEPLOY_URL ?? process.env.PROJECTBRAIN_SMOKE_URL ?? "http://127.0.0.1:1209";
const sshTarget = process.env.PROJECTBRAIN_DEPLOY_SSH_TARGET ?? "root@127.0.0.1";
const deployPath = process.env.PROJECTBRAIN_DEPLOY_PATH ?? "/mnt/pool/appdata/brain";
const sshKey = process.env.PROJECTBRAIN_DEPLOY_SSH_KEY ?? path.join(os.homedir(), ".ssh", "widefrog_unraid_deploy");
const shouldWrite = process.argv.includes("--write") || process.env.PROJECTBRAIN_DEPLOY_PROOF_WRITE === "1";
const explicitOutputArg = process.argv.find((arg) => arg.startsWith("--out="));
const explicitOutputPath = explicitOutputArg?.slice("--out=".length) || process.env.PROJECTBRAIN_DEPLOY_PROOF_OUT;

const run = (command, args) => spawnSync(command, args, {
  encoding: "utf8",
  shell: false,
  timeout: 10_000,
});

const getGitCommit = () => {
  const result = run("git", ["rev-parse", "--short", "HEAD"]);
  return result.status === 0 ? result.stdout.trim() : "unknown";
};

const createDefaultProofPath = (commit) => {
  const stamp = new Date().toISOString().replace(/[:.]/g, "-");
  return `checkpoints/deployment-proof/projectbrain-deployment-proof-${commit}-${stamp}.md`;
};

const checkHttp = async (urlPath) => {
  try {
    const response = await fetch(`${baseUrl}${urlPath}`, { signal: AbortSignal.timeout(10_000) });
    const body = await response.text();

    return {
      ok: response.ok,
      status: String(response.status),
      body: body.slice(0, 260).replace(/\s+/g, " ").trim(),
    };
  } catch (error) {
    return {
      ok: false,
      status: "unreachable",
      body: error instanceof Error ? error.message : String(error),
    };
  }
};

const runSsh = (remoteCommand) => {
  if (!fs.existsSync(sshKey)) {
    return {
      ok: false,
      status: "missing-key",
      stdout: "",
      stderr: `SSH key not found: ${sshKey}`,
    };
  }

  const result = spawnSync("ssh", [
    "-i",
    sshKey,
    "-o",
    "BatchMode=yes",
    "-o",
    "ConnectTimeout=8",
    sshTarget,
    remoteCommand,
  ], {
    encoding: "utf8",
    shell: false,
    timeout: 20_000,
  });

  return {
    ok: result.status === 0,
    status: String(result.status),
    stdout: result.stdout?.trim() ?? "",
    stderr: result.stderr?.trim() || result.error?.message || "",
  };
};

const currentCommit = getGitCommit();
const health = await checkHttp("/api/health");
const shellProof = runSsh([
  `echo deployed_commit=$(git -C ${deployPath} rev-parse --short HEAD 2>/dev/null || echo unknown)`,
  "echo containers_begin",
  "docker ps --format '{{.Names}} {{.Status}} {{.Ports}}' | grep projectbrain || true",
  "echo containers_end",
].join(" && "));

const deployedCommitMatch = shellProof.stdout.match(/^deployed_commit=(.+)$/m);
const deployedCommit = deployedCommitMatch?.[1]?.trim() ?? "unknown";
const containerBlock = shellProof.stdout.match(/containers_begin\n([\s\S]*?)\n?containers_end/)?.[1]?.trim() ?? "";
const hasFrontend = isRunningContainer(containerBlock, "projectbrain-frontend", "1209->80/tcp");
const hasApi = isRunningContainer(containerBlock, "projectbrain-api");
const hasPostgres = isRunningContainer(containerBlock, "projectbrain-postgres");
const commitFreshness = compareDeploymentCommits(currentCommit, deployedCommit);
const verdict = health.ok && shellProof.ok && commitFreshness === "current" && hasFrontend && hasApi && hasPostgres
  ? "PASS"
  : "ATTENTION REQUIRED";
const proofPath = explicitOutputPath || createDefaultProofPath(currentCommit);

const lines = [
  "# ProjectBrain Remote Deployment Proof",
  "",
  `Generated: ${new Date().toISOString()}`,
  `Local commit: ${currentCommit}`,
  `Deployment URL: ${baseUrl}`,
  `SSH target: ${sshTarget}`,
  `Deployment path: ${deployPath}`,
  `Remote commit: ${deployedCommit}`,
  `Commit freshness: ${commitFreshness}`,
  `Verdict: ${verdict}`,
  "",
  "## HTTP Health",
  "",
  `- Status: ${health.status}`,
  `- Result: ${health.ok ? "reachable" : "not reachable"}`,
  `- Body: ${health.body}`,
  "",
  "## Remote Runtime",
  "",
  `- SSH result: ${shellProof.ok ? "reachable" : shellProof.status}`,
  `- Frontend container: ${hasFrontend ? "up" : "not proven"}`,
  `- API container: ${hasApi ? "up" : "not proven"}`,
  `- Postgres container: ${hasPostgres ? "up" : "not proven"}`,
  "",
  "```text",
  containerBlock || shellProof.stderr || "No remote container output captured.",
  "```",
  "",
  "## Operator Commands",
  "",
  "```bash",
  "PROJECTBRAIN_DEPLOY_PROOF_WRITE=1 pnpm run release:deployment-proof",
  "PROJECTBRAIN_RELEASE_DEPLOYMENT_PROOF=1 pnpm run release:bundle",
  "```",
].join("\n");

console.log(lines);

if (shouldWrite) {
  fs.mkdirSync(path.dirname(proofPath), { recursive: true });
  fs.writeFileSync(proofPath, `${lines}\n`, "utf8");
  console.log(`\nRemote deployment proof written to ${proofPath}`);
}

if (verdict !== "PASS") {
  process.exitCode = 1;
}