#!/usr/bin/env bash
# Universal Alert Sender
# Sends alerts via configured channels

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
CONFIG_FILE="${PROJECT_ROOT}/smom-dbis-138/.env.alerts"

# Load configuration
if [ -f "$CONFIG_FILE" ]; then
    source "$CONFIG_FILE"
fi

SEVERITY="${1:-WARNING}"
TITLE="${2:-Alert}"
MESSAGE="${3:-}"

send_email_alert() {
    if [ "${ALERT_EMAIL_ENABLED:-false}" != "true" ]; then
        return 0
    fi
    
    local to="${ALERT_EMAIL_TO:-}"
    if [ -z "$to" ]; then
        return 0
    fi
    
    echo "$MESSAGE" | mail -s "[$SEVERITY] $TITLE" "$to" 2>/dev/null || true
}

send_webhook_alert() {
    local url="${1:-}"
    if [ -z "$url" ] || [ "${ALERT_WEBHOOK_ENABLED:-false}" != "true" ]; then
        return 0
    fi
    
    local payload=$(cat <<EOF
{
  "severity": "$SEVERITY",
  "title": "$TITLE",
  "message": "$MESSAGE",
  "timestamp": "$(date -Iseconds)"
}
EOF
)
    
    curl -X POST "$url" \
        -H "Content-Type: application/json" \
        -d "$payload" \
        2>/dev/null || true
}

send_slack_alert() {
    if [ "${ALERT_SLACK_ENABLED:-false}" != "true" ]; then
        return 0
    fi
    
    local webhook="${ALERT_SLACK_WEBHOOK_URL:-}"
    if [ -z "$webhook" ]; then
        return 0
    fi
    
    local color="warning"
    case "$SEVERITY" in
        CRITICAL|ERROR) color="danger" ;;
        WARNING) color="warning" ;;
        INFO) color="good" ;;
    esac
    
    local payload=$(cat <<EOF
{
  "attachments": [{
    "color": "$color",
    "title": "$TITLE",
    "text": "$MESSAGE",
    "footer": "Blockchain Monitoring",
    "ts": $(date +%s)
  }]
}
EOF
)
    
    curl -X POST "$webhook" \
        -H "Content-Type: application/json" \
        -d "$payload" \
        2>/dev/null || true
}

send_discord_alert() {
    if [ "${ALERT_DISCORD_ENABLED:-false}" != "true" ]; then
        return 0
    fi
    
    local webhook="${ALERT_DISCORD_WEBHOOK_URL:-}"
    if [ -z "$webhook" ]; then
        return 0
    fi
    
    local payload=$(cat <<EOF
{
  "embeds": [{
    "title": "$TITLE",
    "description": "$MESSAGE",
    "color": $([ "$SEVERITY" = "CRITICAL" ] && echo "16711680" || echo "16776960"),
    "timestamp": "$(date -Iseconds)"
  }]
}
EOF
)
    
    curl -X POST "$webhook" \
        -H "Content-Type: application/json" \
        -d "$payload" \
        2>/dev/null || true
}

# Send alerts via all enabled channels
send_email_alert
send_webhook_alert "${ALERT_WEBHOOK_URL:-}"
send_slack_alert
send_discord_alert