#!/usr/bin/env bash
# mg-mcp — deploy script.
#
# Idempotent. Safe to re-run on the dev server.
# Public URL: https://optical-dev.oliver.solutions/mg-mcp/
#
# Server layout (mirrors /opt/oliver-sales-ops-platform/, /opt/adeo-maturity-tool/, …):
#   /opt/mg-mcp/  — repo + docker-compose
#
# What it does:
#   1. Sanity (docker, git, compose v2 on PATH).
#   2. Verify required secrets are present in .env (does NOT generate them
#      — Mailgun key + bearer key must be filled in by hand).
#   3. Auto-pick a free host port (9080-9099); persist to .env so re-deploys
#      keep the same port.
#   4. Render deploy/apache-mg-mcp.conf from .tmpl with the chosen port.
#   5. git pull (--no-pull to skip).
#   6. docker compose build && up -d (--no-build to skip).
#   7. Poll /api/health until ready.
#   8. Print URLs + apache-reload reminder.
#
# Usage:
#   ./deploy/deploy.sh                  # full deploy
#   ./deploy/deploy.sh --no-pull        # skip git pull
#   ./deploy/deploy.sh --no-build       # skip docker rebuild
#   ./deploy/deploy.sh --logs           # tail app logs after deploy

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
COMPOSE_PROJECT="mg-mcp"
URL_PATH="/mg-mcp"

cd "$REPO_ROOT"

log()  { printf '\033[1;36m[deploy]\033[0m %s\n' "$*"; }
err()  { printf '\033[1;31m[deploy]\033[0m %s\n' "$*" >&2; }
ok()   { printf '\033[1;32m[deploy]\033[0m %s\n' "$*"; }
warn() { printf '\033[1;33m[deploy]\033[0m %s\n' "$*"; }

DO_PULL=1
DO_BUILD=1
TAIL_LOGS=0

for arg in "$@"; do
    case "$arg" in
        --no-pull)  DO_PULL=0 ;;
        --no-build) DO_BUILD=0 ;;
        --logs)     TAIL_LOGS=1 ;;
        --help|-h)
            sed -n '2,/^set/p' "$0" | grep -E '^# ' | sed 's/^# //'
            exit 0
            ;;
        *)
            err "Unknown flag: $arg (try --help)"
            exit 2
            ;;
    esac
done

# 1. Sanity
[[ -f docker-compose.yml ]] || { err "docker-compose.yml not found in $REPO_ROOT"; exit 1; }
command -v docker >/dev/null 2>&1 || { err "docker not on PATH"; exit 1; }
command -v git    >/dev/null 2>&1 || { err "git not on PATH"; exit 1; }
docker compose version >/dev/null 2>&1 || { err "docker compose v2 not found"; exit 1; }

unset COMPOSE_PROFILES

# ---------- helpers ----------

port_in_use() {
    local port=$1
    local pid=""
    if command -v lsof >/dev/null 2>&1; then
        pid=$( { lsof -nP -iTCP:"$port" -sTCP:LISTEN 2>/dev/null || true; } | awk 'NR>1 {print $2}' | head -1 )
    else
        pid=$( { ss -ltnp "sport = :$port" 2>/dev/null || true; } | awk -F'pid=' 'NR>1 {print $2}' | cut -d, -f1 | head -1 )
    fi
    [[ -n "$pid" ]]
}

# Echo the compose project name of the docker container publishing $port,
# or empty if no docker container holds it.
port_owner_project() {
    local port=$1
    docker ps --format '{{.Label "com.docker.compose.project"}}|{{.Ports}}' 2>/dev/null \
        | awk -F'|' -v p=":${port}->" '$2 ~ p {print $1; exit}'
}

# True if port is free for us: nothing listening, OR our own compose project
# already publishes it (so re-deploys don't shuffle ports).
port_available_for_us() {
    local port=$1
    if ! port_in_use "$port"; then return 0; fi
    [[ "$(port_owner_project "$port")" == "$COMPOSE_PROJECT" ]]
}

find_free_port() {
    local preferred=$1
    local start=$2
    local end=$3
    if port_available_for_us "$preferred"; then
        printf '%s' "$preferred"
        return 0
    fi
    local p
    for ((p=start; p<=end; p++)); do
        if port_available_for_us "$p"; then
            printf '%s' "$p"
            return 0
        fi
    done
    return 1
}

set_env_var() {
    local key=$1
    local value=$2
    local file="${REPO_ROOT}/.env"
    if grep -q "^${key}=" "$file" 2>/dev/null; then
        sed -i.bak "s#^${key}=.*#${key}=${value}#" "$file"
        rm -f "${file}.bak"
    else
        printf '%s=%s\n' "$key" "$value" >> "$file"
    fi
}

get_env_var() {
    grep -E "^${1}=" "${REPO_ROOT}/.env" 2>/dev/null | head -1 | cut -d= -f2- | tr -d '"' || true
}

# ---------- 2. Verify secrets ----------

if [[ ! -f "${REPO_ROOT}/.env" ]]; then
    err ".env not found. Copy .env.example → .env and fill in MAILGUN_API_KEY + MCP_BEARER_KEY first."
    exit 1
fi

MISSING=()
for key in MAILGUN_API_KEY MAILGUN_DOMAIN MAILGUN_FROM MCP_BEARER_KEY; do
    val=$(get_env_var "$key")
    if [[ -z "$val" || "$val" == replace-with-* ]]; then
        MISSING+=("$key")
    fi
done
if (( ${#MISSING[@]} > 0 )); then
    err "These .env values are missing or still set to placeholder:"
    for k in "${MISSING[@]}"; do err "  - $k"; done
    err "Edit ${REPO_ROOT}/.env and re-run."
    exit 1
fi

# ---------- 3. Pick port ----------

DEFAULT_APP_PORT=9080

APP_PORT=$(get_env_var MG_MCP_PORT); APP_PORT=${APP_PORT:-$DEFAULT_APP_PORT}
PREV_APP_PORT="$APP_PORT"

log "Resolving host port (preferred: $APP_PORT)…"

NEW_APP_PORT=$(find_free_port "$APP_PORT" 9080 9099) || NEW_APP_PORT=""
if [[ -z "$NEW_APP_PORT" ]]; then
    err "Could not find a free port in 9080-9099."
    exit 1
fi
[[ "$NEW_APP_PORT" != "$APP_PORT" ]] && warn "port $APP_PORT taken by another app → using $NEW_APP_PORT"
APP_PORT=$NEW_APP_PORT
set_env_var MG_MCP_PORT "$APP_PORT"
ok "Port: $APP_PORT (persisted to .env)"

# ---------- 4. Render apache-mg-mcp.conf from template ----------

APACHE_TMPL="$REPO_ROOT/deploy/apache-mg-mcp.conf.tmpl"
APACHE_CONF="$REPO_ROOT/deploy/apache-mg-mcp.conf"
if [[ -f "$APACHE_TMPL" ]]; then
    sed "s#__APP_PORT__#${APP_PORT}#g" "$APACHE_TMPL" > "$APACHE_CONF"
    ok "Rendered apache-mg-mcp.conf with app port $APP_PORT"
else
    err "apache-mg-mcp.conf.tmpl missing — cannot render Apache config."
    exit 1
fi

# ---------- 5. git pull ----------

if (( DO_PULL )); then
    log "git pull origin main"
    git pull --ff-only origin main
fi

# ---------- 6. Docker build + up ----------

if (( DO_BUILD )); then
    log "docker compose build"
    docker compose build
fi

log "docker compose up -d"
docker compose up -d

# ---------- 7. Health poll ----------

log "Waiting for /api/health on :$APP_PORT (max 60s)…"
for i in $(seq 1 30); do
    if curl -fsS "http://127.0.0.1:${APP_PORT}/api/health" >/dev/null 2>&1; then
        ok "Healthy"
        break
    fi
    sleep 2
    if (( i == 30 )); then
        err "App did not become healthy within 60s. Recent logs:"
        docker compose logs app --tail 60 || true
        exit 1
    fi
done

# ---------- 8. Report ----------

ok "Deploy complete."
echo
echo "  Local health:  http://127.0.0.1:${APP_PORT}/api/health"
echo "  Public URL:    https://optical-dev.oliver.solutions${URL_PATH}/"
echo "  MCP endpoint:  https://optical-dev.oliver.solutions${URL_PATH}/mcp"
echo "  Port:          $APP_PORT"
echo
echo "  Apache include line for the merged vhost:"
echo "    Include $REPO_ROOT/deploy/apache-mg-mcp.conf"
if [[ "$APP_PORT" != "$PREV_APP_PORT" ]] || ! grep -qF "$REPO_ROOT/deploy/apache-mg-mcp.conf" /etc/apache2/sites-enabled/*.conf 2>/dev/null; then
    echo
    warn "App port changed (or first deploy). Reload Apache to pick up the new ProxyPass:"
    echo "    sudo apachectl configtest && sudo systemctl reload apache2"
fi
echo

if (( TAIL_LOGS )); then
    log "Tailing app logs (Ctrl-C to stop)…"
    docker compose logs -f app
fi