#!/usr/bin/env bash
set -euo pipefail

SLUG="${1:-}"
if [[ -z "$SLUG" ]]; then
  echo "usage: deploy.sh <slug>" >&2
  exit 1
fi

ROOT="/var/www/sites/$SLUG"
LOG="/var/log/websites/deploy-$SLUG.log"
STATUS="/var/log/websites/deploy-$SLUG.status.json"
ECOSYSTEM="/var/www/sites/ecosystem.config.cjs"
exec >>"$LOG" 2>&1

write_status() {
  local status="$1"
  local detail="${2:-}"
  detail="${detail//\\/\\\\}"
  detail="${detail//\"/\\\"}"
  detail="${detail//$'\n'/ }"
  detail="${detail:0:500}"
  printf '{"slug":"%s","status":"%s","detail":"%s","at":"%s"}\n' \
    "$SLUG" \
    "$status" \
    "$detail" \
    "$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
    >"$STATUS"
}

fail_snippet() {
  if [[ ! -f "$LOG" ]]; then
    return 0
  fi
  local chunk snippet=""
  # Only the current deploy (log is appended across runs).
  chunk="$(awk 'BEGIN{s=""} /^==== / && /deploy start:/{s=""} {s=s $0 ORS} END{printf "%s", s}' "$LOG")"
  snippet="$(
    { printf '%s' "$chunk" | grep -E "Error:|Type error|Module not found|ELIFECYCLE|npm ERR!" || true; } \
      | sed 's/\x1b\[[0-9;]*m//g' \
      | tail -n 4 \
      | tr '\n' ' ' \
      | sed 's/[[:space:]]\+/ /g'
  )"
  if [[ -z "${snippet// }" ]]; then
    snippet="$(
      printf '%s' "$chunk" \
        | tail -n 12 \
        | sed 's/\x1b\[[0-9;]*m//g' \
        | tr '\n' ' ' \
        | sed 's/[[:space:]]\+/ /g'
    )"
  fi
  printf '%s' "$snippet"
}

echo "==== $(date -u +%Y-%m-%dT%H:%M:%SZ) deploy start: $SLUG ===="
write_status "started" "Deploy running"

cleanup_fail() {
  local code=$?
  trap - ERR
  local snippet
  snippet="$(fail_snippet)"
  if [[ -n "${snippet// }" ]]; then
    write_status "failed" "exit $code: $snippet"
  else
    write_status "failed" "deploy.sh exited with code $code"
  fi
  exit "$code"
}
trap cleanup_fail ERR

if [[ ! -d "$ROOT/.git" ]]; then
  echo "missing site: $ROOT"
  write_status "failed" "missing site directory"
  exit 1
fi

cd "$ROOT"
export GIT_SSH_COMMAND="${GIT_SSH_COMMAND:-ssh -i /root/.ssh/websites_deploy -o IdentitiesOnly=yes -o StrictHostKeyChecking=accept-new}"

git fetch origin

# Prefer origin/HEAD, then main, then master (repos may use either).
BRANCH=""
if git rev-parse --verify --quiet origin/HEAD >/dev/null; then
  BRANCH="$(git rev-parse --abbrev-ref origin/HEAD 2>/dev/null || true)"
  BRANCH="${BRANCH#origin/}"
fi
if [[ -z "$BRANCH" || "$BRANCH" == "HEAD" ]]; then
  if git rev-parse --verify --quiet origin/main >/dev/null; then
    BRANCH="main"
  elif git rev-parse --verify --quiet origin/master >/dev/null; then
    BRANCH="master"
  else
    echo "could not determine default branch (tried origin/HEAD, main, master)"
    write_status "failed" "no origin/main or origin/master"
    exit 1
  fi
fi

echo "resetting to origin/$BRANCH"
git checkout -B "$BRANCH" "origin/$BRANCH"
git reset --hard "origin/$BRANCH"

if [[ ! -f package.json ]]; then
  echo "package.json missing after checkout"
  write_status "failed" "package.json missing — empty or wrong branch?"
  exit 1
fi

npm ci
npm run build

# Next.js standalone: copy static assets Next does not place in standalone/, then
# point PM2 at server.js and drop the full node_modules tree.
if [[ -f .next/standalone/server.js ]]; then
  echo "standalone build detected — preparing runtime bundle"
  mkdir -p .next/standalone/.next
  rm -rf .next/standalone/.next/static
  cp -a .next/static .next/standalone/.next/static
  if [[ -d public ]]; then
    rm -rf .next/standalone/public
    # Follow symlinks (e.g. public/images -> ../src/images) so standalone
    # serves real files. cp -a alone would copy a broken relative link.
    mkdir -p .next/standalone/public
    cp -aL public/. .next/standalone/public/
  fi

  SLUG="$SLUG" ROOT="$ROOT" ECOSYSTEM="$ECOSYSTEM" node <<'NODE'
const fs = require('fs');
const path = process.env.ECOSYSTEM;
const slug = process.env.SLUG;
const root = process.env.ROOT;
let cfg = { apps: [] };
try {
  delete require.cache[require.resolve(path)];
  cfg = require(path);
  if (!Array.isArray(cfg.apps)) cfg.apps = [];
} catch (_) {
  cfg = { apps: [] };
}

const app = cfg.apps.find((a) => a.name === slug);
if (!app) {
  console.error('ecosystem entry missing for', slug);
  process.exit(1);
}

const port =
  (app.env && Number(app.env.PORT)) ||
  (String(app.args || '').match(/--port\s+(\d+)/) || [])[1] ||
  3005;

app.cwd = root + '/.next/standalone';
app.script = 'server.js';
app.args = '';
app.env = {
  ...(app.env || {}),
  NODE_ENV: 'production',
  PORT: String(port),
  HOSTNAME: '127.0.0.1',
};

const lines = ['module.exports = {', '  apps: ['];
cfg.apps.forEach((entry, idx) => {
  lines.push('    {');
  lines.push(`      name: ${JSON.stringify(entry.name)},`);
  lines.push(`      cwd: ${JSON.stringify(entry.cwd)},`);
  lines.push(`      script: ${JSON.stringify(entry.script)},`);
  if (entry.args) {
    lines.push(`      args: ${JSON.stringify(entry.args)},`);
  }
  lines.push('      env: {');
  for (const [key, value] of Object.entries(entry.env || {})) {
    lines.push(`        ${key}: ${JSON.stringify(String(value))},`);
  }
  lines.push('      },');
  lines.push(`      error_file: ${JSON.stringify(entry.error_file)},`);
  lines.push(`      out_file: ${JSON.stringify(entry.out_file)},`);
  lines.push('      time: true,');
  if (entry.max_memory_restart) {
    lines.push(`      max_memory_restart: ${JSON.stringify(entry.max_memory_restart)},`);
  }
  lines.push(idx === cfg.apps.length - 1 ? '    }' : '    },');
});
lines.push('  ],');
lines.push('};');
lines.push('');
fs.writeFileSync(path, lines.join('\n'));
console.log('ecosystem updated for standalone:', slug, 'port', port);
NODE

  # Full delete+start so PM2 picks up new cwd/script (restart alone keeps old path).
  pm2 delete "$SLUG" || true
  pm2 start "$ECOSYSTEM" --only "$SLUG"
  pm2 save || true

  echo "removing full node_modules (standalone runtime keeps its own minimal copy)"
  rm -rf node_modules

  # Drop Next build leftovers not needed at runtime (cache + non-standalone trees).
  # Keep .next/standalone only.
  if [[ -d .next ]]; then
    find .next -mindepth 1 -maxdepth 1 ! -name standalone -exec rm -rf {} +
  fi

  echo "==== $(date -u +%Y-%m-%dT%H:%M:%SZ) deploy ok (standalone): $SLUG ===="
  write_status "success" "Deployed origin/$BRANCH (standalone)"
  trap - ERR
  exit 0
fi

echo "no standalone output — using next start (legacy)"

# Reset cwd/script in case a previous deploy used standalone. Do not
# `pm2 restart --update-env`: the deploy agent has PORT=9050 and that
# leaks into the site, so nginx (site port) gets 502.
SLUG="$SLUG" ROOT="$ROOT" ECOSYSTEM="$ECOSYSTEM" node <<'NODE'
const fs = require('fs');
const path = process.env.ECOSYSTEM;
const slug = process.env.SLUG;
const root = process.env.ROOT;
let cfg = { apps: [] };
try {
  delete require.cache[require.resolve(path)];
  cfg = require(path);
  if (!Array.isArray(cfg.apps)) cfg.apps = [];
} catch (_) {
  cfg = { apps: [] };
}

const app = cfg.apps.find((a) => a.name === slug);
if (!app) {
  console.error('ecosystem entry missing for', slug);
  process.exit(1);
}

const fromEnv = Number(app.env && app.env.PORT);
const fromArgs = Number((String(app.args || '').match(/--port\s+(\d+)/) || [])[1]);
const port =
  [fromEnv, fromArgs].find((p) => Number.isFinite(p) && p > 0 && p !== 9050) || 3005;

app.cwd = root;
app.script = 'node_modules/next/dist/bin/next';
app.args = 'start --hostname 127.0.0.1 --port ' + port;
app.env = {
  NODE_ENV: 'production',
  PORT: String(port),
};

const lines = ['module.exports = {', '  apps: ['];
cfg.apps.forEach((entry, idx) => {
  lines.push('    {');
  lines.push(`      name: ${JSON.stringify(entry.name)},`);
  lines.push(`      cwd: ${JSON.stringify(entry.cwd)},`);
  lines.push(`      script: ${JSON.stringify(entry.script)},`);
  if (entry.args) {
    lines.push(`      args: ${JSON.stringify(entry.args)},`);
  }
  lines.push('      env: {');
  for (const [key, value] of Object.entries(entry.env || {})) {
    lines.push(`        ${key}: ${JSON.stringify(String(value))},`);
  }
  lines.push('      },');
  lines.push(`      error_file: ${JSON.stringify(entry.error_file)},`);
  lines.push(`      out_file: ${JSON.stringify(entry.out_file)},`);
  lines.push('      time: true,');
  if (entry.max_memory_restart) {
    lines.push(`      max_memory_restart: ${JSON.stringify(entry.max_memory_restart)},`);
  }
  lines.push(idx === cfg.apps.length - 1 ? '    }' : '    },');
});
lines.push('  ],');
lines.push('};');
lines.push('');
fs.writeFileSync(path, lines.join('\n'));
console.log('ecosystem updated for next start:', slug, 'port', port);
NODE

pm2 delete "$SLUG" || true
pm2 start "$ECOSYSTEM" --only "$SLUG"
pm2 save || true

echo "==== $(date -u +%Y-%m-%dT%H:%M:%SZ) deploy ok: $SLUG ===="
write_status "success" "Deployed origin/$BRANCH"
trap - ERR