#!/usr/bin/env bash
#
# deploy.sh -- deploy the headscale stack (caddy + headscale) on Alpine.
#
# Single-node, dedicated host: runs everything as root.
#
# What this does:
#   1. Installs docker + docker-cli-compose if missing.
#   2. Lays down docker-compose.yml, Caddyfile, and a substituted
#      config.yaml in $STACK_DIR.
#   3. Generates .env on first run; existing .env is never overwritten.
#   4. Prompts for required values not preset (HEADSCALE_DOMAIN,
#      ACME_EMAIL, TAILNET_DOMAIN, POCKETID_DOMAIN, OIDC_CLIENT_ID,
#      OIDC_CLIENT_SECRET).
#   5. Substitutes those values into config.yaml from the embedded
#      template.
#   6. Opens TCP 80/443 in UFW if it's installed and active (Tailscale
#      clients connect on 443; LE HTTP-01 needs 80).
#   7. Pulls images, brings the stack up, waits for healthchecks.
#
# Idempotent: re-run to apply config changes / pull new images. Re-running
# regenerates config.yaml from the current .env so edits to .env propagate
# (but secrets in .env are never touched once seeded).
#
# Self-contained: docker-compose.yml, Caddyfile, config.yaml, policy.hujson
# and .env.example are embedded as a base64-encoded tar.gz at the bottom of
# this file. Rebuild with build.sh after editing the loose source files.
#
# Usage:
#   bash deploy.sh                                 # interactive prompts
#   HEADSCALE_DOMAIN=hs.example.com \
#   ACME_EMAIL=admin@example.com \
#   TAILNET_DOMAIN=tail.example.com \
#   POCKETID_DOMAIN=auth.example.com \
#   OIDC_CLIENT_ID=... OIDC_CLIENT_SECRET=... FORCE=1 bash deploy.sh
#
#   STACK_DIR=/opt/headscale bash deploy.sh
#   SKIP_DOCKER_INSTALL=1 bash deploy.sh

set -euo pipefail

: "${STACK_DIR:=/srv/headscale}"
: "${SKIP_DOCKER_INSTALL:=0}"
: "${FORCE:=0}"
: "${SKIP_PROMPTS:=0}"          # non-interactive: require values via env, no prompts
[[ "$SKIP_PROMPTS" == "1" ]] && FORCE=1
: "${HEADSCALE_DOMAIN:=}"
: "${ACME_EMAIL:=}"
: "${TAILNET_DOMAIN:=}"
: "${POCKETID_DOMAIN:=}"
: "${OIDC_CLIENT_ID:=}"
: "${OIDC_CLIENT_SECRET:=}"
: "${HEADPLANE_OIDC_CLIENT_ID:=}"      # optional: headplane UI OIDC login
: "${HEADPLANE_OIDC_CLIENT_SECRET:=}"

log()  { printf '\033[1;32m[+]\033[0m %s\n' "$*"; }
warn() { printf '\033[1;33m[!]\033[0m %s\n' "$*" >&2; }
die()  { printf '\033[1;31m[x]\033[0m %s\n' "$*" >&2; exit 1; }

[[ $EUID -eq 0 ]] || die "Run as root."

# ---------------------------------------------------------------------------
# OS detection + Docker install (Alpine / Debian / Alma). This deploy.sh is
# self-contained (scp'd standalone), so the OS logic is inlined here instead
# of sourced from scripts/oslib.sh.
# ---------------------------------------------------------------------------
osfam() {
    local id="" like=""
    if [[ -r /etc/os-release ]]; then
        id="$(. /etc/os-release 2>/dev/null && echo "${ID:-}")"
        like="$(. /etc/os-release 2>/dev/null && echo "${ID_LIKE:-}")"
    fi
    case " $id $like " in
        *" alpine "*) echo alpine ;;
        *" debian "*|*" ubuntu "*) echo debian ;;
        *" rhel "*|*" fedora "*|*" centos "*) echo rhel ;;
        *) echo "${id:-unknown}" ;;
    esac
}

install_docker() {
    if command -v docker >/dev/null 2>&1; then
        log "Docker already installed: $(docker --version)"
    else
        log "Installing Docker (OS: $(osfam))..."
        case "$(osfam)" in
            alpine)      apk add -q docker docker-cli-compose openrc ;;
            debian|rhel) command -v curl >/dev/null 2>&1 || \
                           { command -v apt-get >/dev/null 2>&1 && apt-get install -y -qq curl; } || \
                           { command -v dnf >/dev/null 2>&1 && dnf install -y -q curl; }
                         curl -fsSL https://get.docker.com | sh ;;
            *)           die "Unsupported OS for auto Docker install. Set SKIP_DOCKER_INSTALL=1 and install Docker yourself." ;;
        esac
    fi
    if command -v rc-update >/dev/null 2>&1; then
        rc-update add docker default >/dev/null 2>&1 || true
        rc-service docker status >/dev/null 2>&1 || rc-service docker start
    elif command -v systemctl >/dev/null 2>&1; then
        systemctl enable --now docker >/dev/null 2>&1 || systemctl start docker || true
    fi
}

open_web_ports() {
    # Register 80/443 for this stack. Prefer the host firewall (harden-firewall.sh)
    # when present: drop in a rule file and re-apply. Else fall back to ufw/
    # firewalld if active (no-op when neither is).
    #
    # NOTE: Caddy publishes 80/443 via Docker, which reaches the host through the
    # nat/FORWARD chains and BYPASSES the INPUT firewall -- so this is harmless
    # belt-and-braces for any host-bound bind and self-documents the stack ports.
    if [[ -d /etc/firewall/ports.d && -x /usr/local/sbin/firewall-apply ]]; then
        log "Registering 80,443/tcp with host firewall..."
        printf '80/tcp\n443/tcp\n' > /etc/firewall/ports.d/headscale.rule
        /usr/local/sbin/firewall-apply
    elif command -v ufw >/dev/null 2>&1 && ufw status 2>/dev/null | grep -q '^Status: active'; then
        log "ufw active -- allowing 80,443/tcp..."
        ufw allow 80/tcp >/dev/null; ufw allow 443/tcp >/dev/null
    elif command -v firewall-cmd >/dev/null 2>&1 && firewall-cmd --state >/dev/null 2>&1; then
        log "firewalld active -- allowing http,https..."
        firewall-cmd -q --add-service=http --permanent
        firewall-cmd -q --add-service=https --permanent
        firewall-cmd -q --reload
    fi
}

# Write headplane's config to $STACK_DIR/headplane.yaml from the current .env
# values. OIDC is enabled only when a client id + secret are present; otherwise
# headplane falls back to API-key login. Mode is API-only (no Docker socket).
render_headplane_config() {
    local oidc_enabled=false
    [[ -n "${HEADPLANE_OIDC_CLIENT_ID:-}" && -n "${HEADPLANE_OIDC_CLIENT_SECRET:-}" ]] && oidc_enabled=true
    ( umask 077
      cat > "$STACK_DIR/headplane.yaml" <<EOF
# Generated by deploy.sh -- do not edit by hand (regenerated each run from .env).
server:
  host: "0.0.0.0"
  port: 3000
  base_url: "https://${HEADSCALE_DOMAIN}"
  cookie_secret: "${HEADPLANE_COOKIE_SECRET}"
  cookie_secure: true
headscale:
  url: "http://headscale:8080"
  api_key: "${HEADPLANE_HS_API_KEY:-}"
oidc:
  enabled: ${oidc_enabled}
  issuer: "https://${POCKETID_DOMAIN}"
  client_id: "${HEADPLANE_OIDC_CLIENT_ID:-}"
  client_secret: "${HEADPLANE_OIDC_CLIENT_SECRET:-}"
  use_pkce: true
EOF
    )
    chmod 600 "$STACK_DIR/headplane.yaml"
}

# ----------------------------------------------------------------------------
# Extract embedded archive
# ----------------------------------------------------------------------------
SCRIPT_DIR=$(mktemp -d -t headscale-deploy.XXXXXX)
trap 'rm -rf "$SCRIPT_DIR"' EXIT

extract_archive() {
    grep -a -A 9999999 '^__ARCHIVE_BELOW__$' "$0" \
        | tail -n +2 \
        | base64 -d \
        | tar -xz -C "$SCRIPT_DIR"
}

if grep -q -a '^__ARCHIVE_BELOW__$' "$0"; then
    log "Extracting embedded deployment files..."
    extract_archive
else
    die "No embedded archive found. Run build.sh to embed deployment files."
fi

for f in docker-compose.yml Caddyfile config.yaml policy.hujson .env.example; do
    [[ -f "$SCRIPT_DIR/$f" ]] || die "Embedded archive missing $f"
done

# ----------------------------------------------------------------------------
# Prompt for required vars
# ----------------------------------------------------------------------------
prompt() {
    local varname="$1" message="$2"
    local -n ref="$varname"
    if [[ -z "${ref:-}" ]]; then
        [[ "$SKIP_PROMPTS" == "1" ]] && die "$varname required (set it in the environment; running with SKIP_PROMPTS=1)."
        read -r -p "$message: " ref
        [[ -n "$ref" ]] || die "$varname required."
    fi
}

prompt HEADSCALE_DOMAIN   "Public hostname for headscale (e.g. hs.example.com)"
prompt ACME_EMAIL         "Let's Encrypt email"
prompt TAILNET_DOMAIN     "Tailnet base domain for MagicDNS (e.g. tail.example.com)"
prompt POCKETID_DOMAIN    "OIDC issuer hostname (your pocket-id, e.g. auth.example.com)"
prompt OIDC_CLIENT_ID     "OIDC client_id (from pocket-id)"
prompt OIDC_CLIENT_SECRET "OIDC client_secret (from pocket-id)"

[[ "$HEADSCALE_DOMAIN" != "$TAILNET_DOMAIN" ]] \
    || die "HEADSCALE_DOMAIN and TAILNET_DOMAIN must differ."

# ----------------------------------------------------------------------------
# Docker
# ----------------------------------------------------------------------------
if [[ "$SKIP_DOCKER_INSTALL" != "1" ]]; then
    install_docker
fi

# Open 80/443 on whichever host firewall is active. (Tailscale clients connect
# on 443; LE HTTP-01 needs 80. Note the IPv6-to-docker-proxy default-deny
# gotcha on ufw -- opening the ports explicitly covers it.)
open_web_ports

# ----------------------------------------------------------------------------
# Stack directory + files
# ----------------------------------------------------------------------------
log "Setting up $STACK_DIR..."
install -d -m 0750 "$STACK_DIR"
install -m 0640 "$SCRIPT_DIR/docker-compose.yml" "$STACK_DIR/docker-compose.yml"
install -m 0640 "$SCRIPT_DIR/Caddyfile"          "$STACK_DIR/Caddyfile"

# .env
ENV_FILE="$STACK_DIR/.env"
if [[ ! -f "$ENV_FILE" ]]; then
    log "Seeding $ENV_FILE..."
    install -m 0600 "$SCRIPT_DIR/.env.example" "$ENV_FILE"
    sed -i \
        -e "s|^HEADSCALE_DOMAIN=.*|HEADSCALE_DOMAIN=${HEADSCALE_DOMAIN}|" \
        -e "s|^ACME_EMAIL=.*|ACME_EMAIL=${ACME_EMAIL}|" \
        -e "s|^TAILNET_DOMAIN=.*|TAILNET_DOMAIN=${TAILNET_DOMAIN}|" \
        -e "s|^POCKETID_DOMAIN=.*|POCKETID_DOMAIN=${POCKETID_DOMAIN}|" \
        -e "s|^OIDC_CLIENT_ID=.*|OIDC_CLIENT_ID=${OIDC_CLIENT_ID}|" \
        -e "s|^OIDC_CLIENT_SECRET=.*|OIDC_CLIENT_SECRET=${OIDC_CLIENT_SECRET}|" \
        -e "s|^HEADPLANE_COOKIE_SECRET=.*|HEADPLANE_COOKIE_SECRET=$(openssl rand -hex 16)|" \
        -e "s|^HEADPLANE_OIDC_CLIENT_ID=.*|HEADPLANE_OIDC_CLIENT_ID=${HEADPLANE_OIDC_CLIENT_ID}|" \
        -e "s|^HEADPLANE_OIDC_CLIENT_SECRET=.*|HEADPLANE_OIDC_CLIENT_SECRET=${HEADPLANE_OIDC_CLIENT_SECRET}|" \
        "$ENV_FILE"
else
    log ".env exists; leaving it alone."
fi

# Validate
missing=()
for var in HEADSCALE_DOMAIN ACME_EMAIL TAILNET_DOMAIN POCKETID_DOMAIN \
           OIDC_CLIENT_ID OIDC_CLIENT_SECRET; do
    grep -E "^${var}=.+$" "$ENV_FILE" >/dev/null || missing+=("$var")
done
(( ${#missing[@]} == 0 )) || die "Missing values in $ENV_FILE: ${missing[*]}"

# Re-read final values from .env so config.yaml substitution sees what's
# actually deployed (not whatever was passed in the environment).
# shellcheck disable=SC1090
set -a; . "$ENV_FILE"; set +a

# config.yaml: regenerate every run from the template so changes to .env
# propagate. Secrets in config.yaml are derived from .env, not stored
# independently, so this is safe.
log "Generating config.yaml from template..."
install -m 0600 "$SCRIPT_DIR/config.yaml" "$STACK_DIR/config.yaml"

# ACL policy: install the default on first run only, so your edits survive
# re-deploys. headscale reads it on start (policy mode = file); after editing,
# validate with `headscale policy check` and `docker compose restart headscale`.
if [[ ! -f "$STACK_DIR/policy.hujson" ]]; then
    log "Installing default ACL policy -> $STACK_DIR/policy.hujson"
    install -m 0640 "$SCRIPT_DIR/policy.hujson" "$STACK_DIR/policy.hujson"
else
    log "ACL policy exists; leaving $STACK_DIR/policy.hujson alone."
fi

# Render headplane.yaml now so the bind mount exists (api_key may still be
# empty on first run; it's re-rendered after the key is minted below).
render_headplane_config

# Escape replacement values for sed (handle slashes/&). Headscale URLs and
# OIDC secrets can contain those.
sed_escape() { printf '%s' "$1" | sed -e 's/[\/&]/\\&/g'; }

sed -i \
    -e "s/__HEADSCALE_DOMAIN__/$(sed_escape "$HEADSCALE_DOMAIN")/g" \
    -e "s/__TAILNET_DOMAIN__/$(sed_escape "$TAILNET_DOMAIN")/g" \
    -e "s/__POCKETID_DOMAIN__/$(sed_escape "$POCKETID_DOMAIN")/g" \
    -e "s/__OIDC_CLIENT_ID__/$(sed_escape "$OIDC_CLIENT_ID")/g" \
    -e "s/__OIDC_CLIENT_SECRET__/$(sed_escape "$OIDC_CLIENT_SECRET")/g" \
    "$STACK_DIR/config.yaml"

# Final sanity check (ignore comment lines so documentation tokens don't
# trip a false positive).
grep -v '^[[:space:]]*#' "$STACK_DIR/config.yaml" | grep -q '__[A-Za-z_]*__' \
    && warn "config.yaml still has un-substituted __PLACEHOLDER__ markers!" \
    || true

# ----------------------------------------------------------------------------
# Bring up the stack
# ----------------------------------------------------------------------------
if [[ "$FORCE" != "1" ]]; then
    cat <<EOF

About to pull images and start the stack from $STACK_DIR.

Caddy will request a Let's Encrypt cert for ${HEADSCALE_DOMAIN}. DNS for
that name must already point at this host, and ports 80/443 must be
reachable from the internet.

In pocket-id, the OIDC client must have this redirect URI registered:
  https://${HEADSCALE_DOMAIN}/oidc/callback

Continue? [y/N]
EOF
    read -r ans
    [[ "${ans,,}" == "y" || "${ans,,}" == "yes" ]] || { warn "Aborted."; exit 0; }
fi

cd "$STACK_DIR"
log "Pulling images..."
docker compose pull

# Start headscale + caddy first; headplane needs a headscale API key, which we
# can only mint once headscale is up.
log "Starting headscale + caddy..."
docker compose up -d --remove-orphans headscale caddy

log "Waiting for headscale to become healthy (up to 120s)..."
deadline=$(( $(date +%s) + 120 ))
while (( $(date +%s) < deadline )); do
    h=$(docker compose ps --format '{{.Service}} {{.Health}}' 2>/dev/null | awk '$1=="headscale"{print $2}')
    [[ "$h" == "healthy" ]] && { log "headscale healthy."; break; }
    sleep 5
done

# ----------------------------------------------------------------------------
# Headplane: mint a headscale API key on first deploy (idempotent -- stored in
# .env), render its config, then bring the UI up.
# ----------------------------------------------------------------------------
if ! grep -qE '^HEADPLANE_HS_API_KEY=.+' "$ENV_FILE"; then
    log "Creating a headscale API key for headplane..."
    HP_KEY=$(docker compose exec -T headscale headscale apikeys create --expiration 999d 2>/dev/null \
                | tr -d '\r' | tail -n1)
    if [[ -n "$HP_KEY" ]]; then
        sed -i "s|^HEADPLANE_HS_API_KEY=.*|HEADPLANE_HS_API_KEY=${HP_KEY}|" "$ENV_FILE"
        log "Stored headplane API key in .env."
    else
        warn "Could not mint a headscale API key; set HEADPLANE_HS_API_KEY in $ENV_FILE and re-run."
    fi
fi

# Re-read .env (now with the API key) and render headplane's config.
set -a; . "$ENV_FILE"; set +a
render_headplane_config

log "Starting headplane + remaining services..."
docker compose up -d --remove-orphans

# ----------------------------------------------------------------------------
# Wait for health
# ----------------------------------------------------------------------------
log "Waiting for services to become healthy (up to 120s)..."
deadline=$(( $(date +%s) + 120 ))
while (( $(date +%s) < deadline )); do
    status=$(docker compose ps --format '{{.Service}} {{.Health}}' 2>/dev/null || true)
    unhealthy=$(echo "$status" | awk '$2 != "healthy" && $2 != "" {print $1}')
    if [[ -z "$unhealthy" && -n "$status" ]]; then
        log "All services healthy."
        break
    fi
    sleep 5
done

# Convenience: a `headscale` command on the host that runs the CLI inside the
# container from ANY directory (plain `docker compose` needs to be run from
# $STACK_DIR). STACK_DIR is baked in; "$@" is passed through.
cat > /usr/local/bin/headscale <<EOF
#!/bin/sh
# Auto-generated by headscale deploy.sh -- runs the headscale CLI in-container.
exec docker compose -f "$STACK_DIR/docker-compose.yml" exec headscale headscale "\$@"
EOF
chmod +x /usr/local/bin/headscale
log "Installed /usr/local/bin/headscale (runs the CLI inside the container)."

echo
log "Stack status:"
docker compose ps
echo
cat <<EOF
================================================================
DEPLOYED

Headscale:   https://${HEADSCALE_DOMAIN}
Headplane:   https://${HEADSCALE_DOMAIN}/admin   (web UI)
Tailnet:     ${TAILNET_DOMAIN} (MagicDNS suffix)
OIDC:        https://${POCKETID_DOMAIN}
Stack dir:   ${STACK_DIR}

OIDC redirect/callback URIs -- register THESE in pocket-id:
  headscale:  https://${HEADSCALE_DOMAIN}/oidc/callback
  headplane:  https://${HEADSCALE_DOMAIN}/admin/oidc/callback   (2nd OIDC client)

ACL policy:  ${STACK_DIR}/policy.hujson
  headscale policy check                  # validate after editing
  cd ${STACK_DIR} && docker compose restart headscale   # apply changes

Headscale CLI -- use the installed wrapper from anywhere:
  headscale users create alice
  headscale users list
  headscale nodes list
  headscale --help
  # (equivalent: cd $STACK_DIR && docker compose exec headscale headscale ...)

Tailscale client login:
  tailscale up --login-server https://${HEADSCALE_DOMAIN}
  # Browser opens, OIDC flow via pocket-id, node registers.

Manage (run from $STACK_DIR):
  cd $STACK_DIR
  docker compose logs -f
  docker compose pull && docker compose up -d   # update
  docker compose down                            # stop, keep volumes
  docker compose down -v                         # stop, WIPE data

Or just re-run this script -- it's idempotent.
================================================================
EOF

# IMPORTANT: do not put any code below this exit. Everything after the
# __ARCHIVE_BELOW__ marker is the embedded tar.gz payload (base64).
exit 0
__ARCHIVE_BELOW__
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