#!/usr/bin/env bash
# gniza/lib/logging.sh — Per-run log files, log_info/warn/error/debug

declare -g LOG_FILE=""

_log_level_num() {
    case "$1" in
        debug) echo 0 ;;
        info)  echo 1 ;;
        warn)  echo 2 ;;
        error) echo 3 ;;
        *)     echo 1 ;;
    esac
}

init_logging() {
    local log_dir="${LOG_DIR:-$DEFAULT_LOG_DIR}"
    mkdir -p "$log_dir" || die "Cannot create log directory: $log_dir"

    LOG_FILE="$log_dir/gniza-$(date -u +%Y%m%d-%H%M%S).log"
    touch "$LOG_FILE" || die "Cannot write to log file: $LOG_FILE"

    # Clean old logs
    local retain="${LOG_RETAIN:-$DEFAULT_LOG_RETAIN}"
    find "$log_dir" -name "gniza-*.log" -mtime +"$retain" -delete 2>/dev/null || true
}

_log() {
    local level="$1"; shift
    local msg="$*"
    local configured_level="${LOG_LEVEL:-$DEFAULT_LOG_LEVEL}"

    local level_num; level_num=$(_log_level_num "$level")
    local configured_num; configured_num=$(_log_level_num "$configured_level")

    (( level_num < configured_num )) && return 0

    local ts; ts=$(date -u +"%d/%m/%Y %H:%M:%S")
    local upper; upper=$(echo "$level" | tr '[:lower:]' '[:upper:]')
    local line="[$ts] [$upper] $msg"

    # Always write to log file if initialized
    [[ -n "$LOG_FILE" ]] && echo "$line" >> "$LOG_FILE"

    # Print to stderr based on level
    case "$level" in
        error) echo "${C_RED}${line}${C_RESET}" >&2 ;;
        warn)  echo "${C_YELLOW}${line}${C_RESET}" >&2 ;;
        info)  echo "${line}" >&2 ;;
        debug) echo "${C_BLUE}${line}${C_RESET}" >&2 ;;
    esac
}

log_info()  { _log info "$@"; }
log_warn()  { _log warn "$@"; }
log_error() { _log error "$@"; }
log_debug() { _log debug "$@"; }