#!/usr/bin/env bash
# deploy.sh — Deploy the vllmScripts repo to a target and restart its service.
#
# This script implements the second half of the git deployment workflow from
# AGENTS.md. It assumes the local changes are committed and pushed, then:
#   1. Pulls the repo on the target
#   2. Installs / enables the systemd unit
#   3. Drops page caches (dankclaw) and restarts the service
#   4. Waits for the health endpoint and reports status
#
# Sudo: when FRANK_SUDO_PW is set, remote sudo pipes it via `sudo -S` for
# headless runs. Otherwise plain `sudo` is used (tty or passwordless config).
# Prefer the passwordless restart helpers installed on each target
# (/usr/local/sbin/frank-restart-<large|small>.sh); they cover the unit
# symlink, cache drop (dankclaw), daemon-reload, and restart in one root
# script. See docs/deployment.md -> Passwordless restart.
#
# Usage:
#   ./deploy.sh <target> [--dry-run]
#   FRANK_SUDO_PW=... ./deploy.sh <target>
#
# Targets:
#   dankclaw   - llama.cpp server (frank-default-large.service, port 7770)
#   dankserver - llama.cpp server (frank-default-small.service, port 7770)
#
# Example:
#   ./deploy.sh dankclaw
#   ./deploy.sh dankserver --dry-run
set -euo pipefail

# ---------------------------------------------------------------------------
# Target configuration
# ---------------------------------------------------------------------------
declare -A REMOTE_USER REMOTE_HOST REMOTE_DIR SERVICE SERVICE_HEALTH DROP_CACHES HELPER HEALTH_WAIT

REMOTE_USER[dankclaw]=dank
REMOTE_HOST[dankclaw]=dankclaw
REMOTE_DIR[dankclaw]="/home/dank/vllmScripts"
SERVICE[dankclaw]="frank-default-large"
SERVICE_HEALTH[dankclaw]="http://127.0.0.1:7770/health"
# Drop page caches before restart: with the model's pages fully cached, the
# KV/graph allocation stalls at load (VRAM stuck at 28 GiB). See AGENTS.md.
DROP_CACHES[dankclaw]=1
# Passwordless restart helper (root-owned, installed via /etc/sudoers.d/frank-large).
# When present, deploy.sh uses it instead of inline sudo commands.
HELPER[dankclaw]="/usr/local/sbin/frank-restart-large.sh"
# Health wait in iterations of 2s. Cold loads after the cache drop measured
# at up to 17 minutes on 2026-08-13; 600 iterations = 20 minutes.
HEALTH_WAIT[dankclaw]=600

REMOTE_USER[dankserver]=dank
REMOTE_HOST[dankserver]=dankserver
REMOTE_DIR[dankserver]="/home/dank/vLLM"
SERVICE[dankserver]="frank-default-small"
SERVICE_HEALTH[dankserver]="http://127.0.0.1:7770/health"
DROP_CACHES[dankserver]=0
HELPER[dankserver]="/usr/local/sbin/frank-restart-small.sh"
HEALTH_WAIT[dankserver]=300

TARGET="${1:-}"
DRY_RUN=0
if [ "${2:-}" = "--dry-run" ]; then
    DRY_RUN=1
fi

# ---------------------------------------------------------------------------
# Validation
# ---------------------------------------------------------------------------
if [ -z "${TARGET:-}" ]; then
    echo "Usage: $0 <dankclaw|dankserver> [--dry-run]"
    exit 1
fi
if [ -z "${REMOTE_HOST[$TARGET]:-}" ]; then
    echo "Unknown target: $TARGET"
    exit 1
fi

# ---------------------------------------------------------------------------
# Sudo wrapper (headless-friendly)
# ---------------------------------------------------------------------------
# When FRANK_SUDO_PW is set, remote sudo reads the password from stdin via
# `sudo -S`. Otherwise plain `sudo` is used (tty or passwordless config).
SUDO_PREFIX="sudo"
if [ -n "${FRANK_SUDO_PW:-}" ]; then
    SUDO_PREFIX="printf '%s\n' '$FRANK_SUDO_PW' | sudo -S"
fi

# ---------------------------------------------------------------------------
# Local checks (pre-flight)
# ---------------------------------------------------------------------------
cd "$(dirname "$0")/.."
if ! git diff --quiet HEAD; then
    echo "FAIL: Local working tree has uncommitted changes."
    echo "Commit or stash them before deploying."
    exit 1
fi
if [ "$(git rev-parse --abbrev-ref HEAD)" != "main" ]; then
    echo "WARN: Not on 'main'; deploying a non-main branch."
fi

echo "=== Deploying to ${TARGET} ==="
echo "  host:    ${REMOTE_HOST[$TARGET]}"
echo "  dir:     ${REMOTE_DIR[$TARGET]}"
echo "  service: ${SERVICE[$TARGET]}"
echo "  health:  ${SERVICE_HEALTH[$TARGET]}"
echo ""

# ---------------------------------------------------------------------------
# Push (unless dry-run)
# ---------------------------------------------------------------------------
if [ "$DRY_RUN" = "1" ]; then
    echo "[dry-run] Would push local main to origin"
    echo "[dry-run] Would SSH to ${REMOTE_HOST[$TARGET]} and git pull"
else
    echo "[1/4] Pushing local main to origin..."
    git push origin main
fi

REMOTE="$(
    printf '%s@%s' "${REMOTE_USER[$TARGET]}" "${REMOTE_HOST[$TARGET]}"
)"

# ---------------------------------------------------------------------------
# Remote: pull + install + restart
# ---------------------------------------------------------------------------
DROP_CACHES_CMD=""
if [ "${DROP_CACHES[$TARGET]}" = "1" ]; then
    DROP_CACHES_CMD="
echo 'Dropping page caches for reliable model load...'
${SUDO_PREFIX} sh -c 'sync; echo 3 > /proc/sys/vm/drop_caches'
"
fi

HELPER_PATH="${HELPER[$TARGET]:-}"

REMOTE_SCRIPT="
set -euo pipefail
cd '${REMOTE_DIR[$TARGET]}'

echo '[2/4] Pulling repo on ${TARGET}...'
git pull origin main

if [ -x '${HELPER_PATH}' ]; then
    # Passwordless restart helper (sudoers NOPASSWD) - preferred path.
    echo '[3/4] Restarting via passwordless helper ${HELPER_PATH}...'
    ${SUDO_PREFIX} '${HELPER_PATH}'
else
    echo '[3/4] Helper not installed; using inline sudo commands...'
    # Install / symlink the systemd unit
    case '${TARGET}' in
      dankclaw)
        ${SUDO_PREFIX} ln -sf '${REMOTE_DIR[$TARGET]}/scripts/frank-default-large.service' /etc/systemd/system/frank-default-large.service
        ;;
      dankserver)
        ${SUDO_PREFIX} ln -sf '${REMOTE_DIR[$TARGET]}/scripts/frank-default-small.service' /etc/systemd/system/frank-default-small.service
        ;;
    esac
    ${DROP_CACHES_CMD}
    echo '[3/4] Reload and restart ${SERVICE[$TARGET]}...'
    ${SUDO_PREFIX} systemctl daemon-reload
    ${SUDO_PREFIX} systemctl enable '${SERVICE[$TARGET]}'
    ${SUDO_PREFIX} systemctl restart '${SERVICE[$TARGET]}'
fi
"

if [ "$DRY_RUN" = "1" ]; then
    echo "[dry-run] Remote commands would run:"
    echo "$REMOTE_SCRIPT"
else
    # shellcheck disable=SC2087
    ssh "$REMOTE" bash -s <<REMOTE_EOF
${REMOTE_SCRIPT}
REMOTE_EOF
fi

# ---------------------------------------------------------------------------
# Health check
# ---------------------------------------------------------------------------
if [ "$DRY_RUN" = "1" ]; then
    echo "[dry-run] Would wait for health at ${SERVICE_HEALTH[$TARGET]}"
else
    echo "[4/4] Waiting for health endpoint ${SERVICE_HEALTH[$TARGET]} (via ssh)..."
    HEALTH_URL="${SERVICE_HEALTH[$TARGET]}"
    HEALTH_ITERS="${HEALTH_WAIT[$TARGET]:-300}"
    for i in $(seq 1 "$HEALTH_ITERS"); do
        if ssh "$REMOTE" "curl -sf '$HEALTH_URL'" > /dev/null 2>&1; then
            echo "  Service healthy after approx $((i * 2))s"
            echo ""
            echo "=== Deploy complete: ${TARGET} ==="
            exit 0
        fi
        sleep 2
    done
    echo "FAIL: Service did not become healthy in $((HEALTH_ITERS * 2))s"
    exit 1
fi