#!/bin/bash
# -----------------------------------------------------------------------------------------------
# --------------------------------- Clear Logs Script ------------------------------------------
# -----------------------------------------------------------------------------------------------
# Clears unRAID system logs and Docker container logs safely.
# Log file paths are configured in Master.conf under LOG_FILES.
# Supports --dry-run to preview what would be cleared without making changes.
# -----------------------------------------------------------------------------------------------

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

source "$SCRIPT_DIR/../Master.conf"
source "$SCRIPT_DIR/../common.sh"

parse_args "$@"

# -----------------------------------------------------------------------------------------------
# ━━━ $ICON_GEAR Setup ━━━
# -----------------------------------------------------------------------------------------------
echo ""
echo "━━━ $ICON_GEAR Setup ━━━"

# ROOT CHECK
if [[ "$EUID" -ne 0 ]]; then
    error "Must be run as root"
    exit 1
fi

success "Running as root"

# -----------------------------------------------------------------------------------------------
# ━━━ $ICON_SUMMARY Status ━━━
# -----------------------------------------------------------------------------------------------
if [[ "$SHOW_STATUS" == true ]]; then
    echo ""
    echo "━━━━━ $ICON_SUMMARY STATUS ━━━━━"
    echo "$ICON_HEALTH  System Logs: ${LOG_FILES[*]}"
    echo "$ICON_CONTAINERS Docker Logs: /var/lib/docker/containers"
    echo "$ICON_GEAR    Dry Run:     $DRY_RUN"
    echo "━━━━━━━━━━━━━━━━━━━━━━━"
    exit 0
fi

# -----------------------------------------------------------------------------------------------
# FUNCTIONS
# -----------------------------------------------------------------------------------------------

# Clears a single log file if it exists.
# Skips with a warning if the file is not found.
clear_file() {
    local file="$1"

    if [[ ! -f "$file" ]]; then
        warn "Not found: $file — skipping"
        return
    fi

    if [[ "$DRY_RUN" == true ]]; then
        warn "DRY RUN — would clear: $file"
    else
        : > "$file"
        success "Cleared: $file"
    fi
}

# Finds and clears all Docker container json log files.
# Skips gracefully if Docker directory or log files are not found.
clear_docker_logs() {
    if [[ ! -d /var/lib/docker/containers ]]; then
        warn "$ICON_CONTAINERS Docker directory not found — skipping"
        return
    fi

    local files
    files=$(find /var/lib/docker/containers/ -name "*-json.log" 2>/dev/null || true)

    if [[ -z "$files" ]]; then
        warn "$ICON_CONTAINERS No Docker logs found — skipping"
        return
    fi

    while IFS= read -r file; do
        if [[ "$DRY_RUN" == true ]]; then
            warn "DRY RUN — would clear Docker log: $file"
        else
            : > "$file"
            success "Cleared Docker log: $(basename "$(dirname "$file")")"
        fi
    done <<< "$files"
}

# -----------------------------------------------------------------------------------------------
# ━━━ $ICON_HEALTH Clear Logs ━━━
# -----------------------------------------------------------------------------------------------
echo ""
echo "━━━ $ICON_HEALTH Clear Logs ━━━"
echo "$ICON_HEALTH  System Logs: ${LOG_FILES[*]}"
echo "$ICON_CONTAINERS Docker Logs: enabled"
echo "$ICON_GEAR    Dry Run:     $DRY_RUN"
echo ""

[[ "$DRY_RUN" == true ]] && warn "DRY RUN — no changes will be made"

START=$(date +%s)
CLEAR_FAILED=false

for logfile in "${LOG_FILES[@]}"; do
    clear_file "$logfile" || CLEAR_FAILED=true
done

echo ""
echo "━━━ $ICON_CONTAINERS Docker ━━━"
clear_docker_logs

END=$(date +%s)

# -----------------------------------------------------------------------------------------------
# ━━━ $ICON_SUMMARY Summary ━━━
# -----------------------------------------------------------------------------------------------
echo ""
echo "━━━━━ $ICON_SUMMARY LOG CLEANER SUMMARY ━━━━━"
echo "$ICON_HEALTH  System Logs: ${LOG_FILES[*]}"
echo "$ICON_CONTAINERS Docker Logs: $([[ "$DRY_RUN" == true ]] && echo "skipped (dry run)" || echo "cleared")"
echo "$ICON_TIME    Duration:    $(format_duration $((END - START)))"
if [[ "$DRY_RUN" == true ]]; then
    echo "$ICON_WARN   Status:      DRY RUN — no changes made"
elif [[ "$CLEAR_FAILED" == true ]]; then
    echo "$ICON_ERROR  Status:      $ICON_ERROR SOME LOGS FAILED TO CLEAR"
    notify "Log clear completed with errors on $(hostname)" "Clear Logs" "warning"
else
    echo "$ICON_DONE   Status:      $ICON_SUCCESS DONE"
    notify "Logs cleared successfully on $(hostname)" "Clear Logs" "normal"
fi
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"