#!/usr/bin/env bash

set -Eeuo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$ROOT_DIR"

branch="${1:-${DEPLOY_BRANCH:-main}}"
remote="${2:-${DEPLOY_REMOTE:-origin}}"

log() {
    printf '\n[%s] %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$1"
}

if ! command -v git >/dev/null 2>&1; then
    printf 'Missing required command: git\n' >&2
    exit 1
fi

if [[ ! -d .git ]]; then
    printf 'No .git directory found in %s\n' "$ROOT_DIR" >&2
    printf 'Clone the repository on the server with git before using this script.\n' >&2
    exit 1
fi

if ! git diff --quiet || ! git diff --cached --quiet; then
    printf 'Tracked local changes detected. Commit or stash them before updating from GitHub.\n' >&2
    exit 1
fi

log "Fetching updates from ${remote}"
git fetch --prune "$remote"

if git show-ref --verify --quiet "refs/heads/$branch"; then
    log "Switching to branch ${branch}"
    git checkout "$branch"
else
    log "Creating local branch ${branch} tracking ${remote}/${branch}"
    git checkout -b "$branch" --track "${remote}/${branch}"
fi

log "Pulling the latest changes for ${branch}"
git pull --ff-only "$remote" "$branch"

log "Running deployment script"
bash "$ROOT_DIR/scripts/deploy.sh"