#!/bin/bash
# ===========================================
# Re:Link Poll-based Auto Deploy
# Checks Gitea for new commits every minute
# ===========================================

APP_DIR="$HOME/relink"
REPO_DIR="$APP_DIR/repo"
LOG_FILE="$APP_DIR/deploy.log"
LOCK_FILE="$APP_DIR/deploy.lock"
GITEA_REPO="http://39.117.244.52:3000/geonhee/Re_Link.git"
BRANCH="main"

log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" >> "$LOG_FILE"; }

# Prevent concurrent deploys
if [ -f "$LOCK_FILE" ]; then
    LOCK_PID=$(cat "$LOCK_FILE" 2>/dev/null)
    if kill -0 "$LOCK_PID" 2>/dev/null; then
        exit 0
    fi
    rm -f "$LOCK_FILE"
fi

# First time: clone
if [ ! -d "$REPO_DIR/.git" ]; then
    log "Initial clone..."
    echo $$ > "$LOCK_FILE"
    trap 'rm -f "$LOCK_FILE"' EXIT
    git clone "$GITEA_REPO" "$REPO_DIR"
    cd "$REPO_DIR"

    if [ -f "$APP_DIR/.env.production" ]; then
        cp "$APP_DIR/.env.production" "$REPO_DIR/.env.production"
    fi

    log "Building and deploying (first time)..."
    docker compose -f docker-compose.prod.yml --env-file .env.production up -d --build --remove-orphans >> "$LOG_FILE" 2>&1
    docker image prune -f >> "$LOG_FILE" 2>&1
    log "First deploy completed. Commit: $(git log --oneline -1)"
    exit 0
fi

cd "$REPO_DIR"

# Fetch latest
git fetch origin "$BRANCH" --quiet 2>/dev/null

LOCAL=$(git rev-parse HEAD)
REMOTE=$(git rev-parse origin/$BRANCH)

# No changes
if [ "$LOCAL" = "$REMOTE" ]; then
    exit 0
fi

# New commits detected - deploy
echo $$ > "$LOCK_FILE"
trap 'rm -f "$LOCK_FILE"' EXIT

log "=== New commits detected ==="
log "Local:  $LOCAL"
log "Remote: $REMOTE"

git reset --hard origin/$BRANCH
log "Updated to: $(git log --oneline -1)"

if [ -f "$APP_DIR/.env.production" ]; then
    cp "$APP_DIR/.env.production" "$REPO_DIR/.env.production"
fi

log "Building and deploying..."
docker compose -f docker-compose.prod.yml --env-file .env.production up -d --build --remove-orphans >> "$LOG_FILE" 2>&1

sleep 15
if curl -sf http://localhost/health > /dev/null 2>&1; then
    log "Health check PASSED"
else
    log "WARNING: Health check pending"
fi

docker image prune -f >> "$LOG_FILE" 2>&1
log "=== Deploy completed ==="