#!/usr/bin/env bash
# gniza/lib/notify.sh — Email notifications

send_notification() {
    local subject="$1"
    local body="$2"
    local success="${3:-true}"

    # Check if notifications are configured
    [[ -z "${NOTIFY_EMAIL:-}" ]] && return 0

    case "${NOTIFY_ON:-$DEFAULT_NOTIFY_ON}" in
        never) return 0 ;;
        failure) [[ "$success" == "true" ]] && return 0 ;;
        always) ;;
    esac

    local hostname; hostname=$(hostname -f)
    local full_subject="[gniza] [$hostname] $subject"

    log_debug "Sending notification to $NOTIFY_EMAIL: $full_subject"

    if command -v mail &>/dev/null; then
        echo "$body" | mail -s "$full_subject" "$NOTIFY_EMAIL"
    elif command -v sendmail &>/dev/null; then
        {
            echo "To: $NOTIFY_EMAIL"
            echo "Subject: $full_subject"
            echo "Content-Type: text/plain; charset=UTF-8"
            echo ""
            echo "$body"
        } | sendmail -t
    else
        log_warn "No mail command available, cannot send notification"
        return 1
    fi

    log_debug "Notification sent"
    return 0
}

send_backup_report() {
    local total="$1"
    local succeeded="$2"
    local failed="$3"
    local duration="$4"
    local failed_accounts="$5"

    local success="true"
    local status="SUCCESS"
    if (( failed > 0 )); then
        if (( succeeded > 0 )); then
            status="PARTIAL FAILURE"
        else
            status="FAILURE"
        fi
        success="false"
    fi

    local body=""
    body+="Backup Report: $status"$'\n'
    body+="=============================="$'\n'
    body+="Hostname: $(hostname -f)"$'\n'
    body+="Timestamp: $(date -u +"%Y-%m-%d %H:%M:%S UTC")"$'\n'
    body+="Duration: $(human_duration "$duration")"$'\n'
    body+=""$'\n'
    body+="Accounts: $total total, $succeeded succeeded, $failed failed"$'\n'

    if [[ -n "$failed_accounts" ]]; then
        body+=""$'\n'
        body+="Failed accounts:"$'\n'
        body+="$failed_accounts"$'\n'
    fi

    if [[ -n "$LOG_FILE" ]]; then
        body+=""$'\n'
        body+="Log file: $LOG_FILE"$'\n'
    fi

    send_notification "Backup $status ($succeeded/$total)" "$body" "$success"
}