#!/usr/bin/env bash
# =============================================================================
# lib/logger.sh — Shared logging library
#
# Usage from any script:
#   source "$(dirname "$0")/lib/logger.sh" "operation-name"
#
# The first argument becomes the log file prefix.
# Example: source lib/logger.sh "deploy"  →  logs/deploy-20260512-123456.log
#
# Override log level at runtime:
#   export LOG_LEVEL=DEBUG
# =============================================================================

# Operation name passed by the calling script (default: "app")
_LOG_PREFIX="${1:-app}"

mkdir -p "$(dirname "$0")/logs"
LOG_FILE="$(dirname "$0")/logs/${_LOG_PREFIX}-$(date +%Y%m%d-%H%M%S).log"
LOG_LEVEL="${LOG_LEVEL:-INFO}"

_log() {
    local level="$1"; shift
    local message="$*"
    local timestamp; timestamp="$(date '+%Y-%m-%d %H:%M:%S')"
    local line="[$timestamp] [$level] $message"

    case "$level" in
        INFO)  printf "\033[0;32m%s\033[0m\n" "$line" ;;
        WARN)  printf "\033[0;33m%s\033[0m\n" "$line" ;;
        ERROR) printf "\033[0;31m%s\033[0m\n" "$line" ;;
        DEBUG)
            [ "$LOG_LEVEL" = "DEBUG" ] && printf "\033[0;36m%s\033[0m\n" "$line" || return 0
            ;;
    esac

    printf "%s\n" "$line" >> "$LOG_FILE"
}

log_info()  { _log INFO  "$@"; }
log_warn()  { _log WARN  "$@"; }
log_error() { _log ERROR "$@"; }
log_debug() { _log DEBUG "$@"; }