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

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
COMPOSE_FILE="$ROOT_DIR/backend/docker-compose.yml"
HTDOCS_DIR="/var/vhosts/valentinesong.oliver.digital/htdocs"

if [ ! -d "$ROOT_DIR/.git" ]; then
    echo "Error: run this script from the repo root (expected .git here)." >&2
    exit 1
fi

if [ ! -f "$COMPOSE_FILE" ]; then
    echo "Error: docker compose file not found at $COMPOSE_FILE" >&2
    exit 1
fi

if [ ! -d "$HTDOCS_DIR" ]; then
    echo "Error: htdocs directory not found at $HTDOCS_DIR" >&2
    exit 1
fi

if ! command -v git >/dev/null 2>&1; then
    echo "Error: git is required but not found in PATH." >&2
    exit 1
fi

if ! command -v docker >/dev/null 2>&1; then
    echo "Error: docker is required but not found in PATH." >&2
    exit 1
fi

if ! docker compose version >/dev/null 2>&1; then
    echo "Error: docker compose is required but not available (docker compose)." >&2
    exit 1
fi

echo "Pulling latest code..."
git -C "$ROOT_DIR" pull

echo "Stopping containers..."
docker compose -f "$COMPOSE_FILE" down

echo "Building containers (using cache)..."
docker compose -f "$COMPOSE_FILE" build

echo "Starting containers..."
docker compose -f "$COMPOSE_FILE" up -d --force-recreate

echo "Waiting for database to be healthy..."
MAX_ATTEMPTS=30
ATTEMPT=0
while [ $ATTEMPT -lt $MAX_ATTEMPTS ]; do
    if docker compose -f "$COMPOSE_FILE" exec -T db pg_isready -U pah -d pah >/dev/null 2>&1; then
        echo "Database is ready."
        break
    fi
    ATTEMPT=$((ATTEMPT + 1))
    if [ $ATTEMPT -eq $MAX_ATTEMPTS ]; then
        echo "Error: database did not become healthy after $MAX_ATTEMPTS attempts." >&2
        exit 1
    fi
    echo "Waiting for database... (attempt $ATTEMPT/$MAX_ATTEMPTS)"
    sleep 2
done

echo "Running database migrations..."
docker compose -f "$COMPOSE_FILE" exec -T web alembic upgrade head

FRONTEND_ITEMS=(
    "index.php"
    "waiting.php"
    "result.php"
    "header.php"
    "footer.php"
    "opengraph.php"
    "admin.html"
    "assets"
)

echo "Removing previous frontend files..."
for item in "${FRONTEND_ITEMS[@]}"; do
    if [ -e "$HTDOCS_DIR/$item" ]; then
        rm -rf "$HTDOCS_DIR/$item"
    fi
done

echo "Copying frontend files to htdocs..."
for item in "${FRONTEND_ITEMS[@]}"; do
    if [ -e "$ROOT_DIR/$item" ]; then
        cp -a "$ROOT_DIR/$item" "$HTDOCS_DIR/"
    else
        echo "Warning: missing $item in repo, skipping." >&2
    fi
done

echo "Deploy complete."