package daemons

import (
	"bufio"
	"io"
	"strings"

	"github.com/rs/zerolog"
)

type Executor interface {
	PrepareMonitorExec() []string
	LaunchMonitor(args []string, execID string, ns string, l zerolog.Logger)
}

// logExecution streams lines from reader and re-logs them at the appropriate
// level by inspecting the zerolog level token already present in each line.
// Lines that contain " ERR " or " error" (case-insensitive) are emitted at
// Error so that they are visible beyond Debug-only sinks.
func logExecution(reader io.ReadCloser, l zerolog.Logger) {
	scanner := bufio.NewScanner(reader)
	// Increase buffer to 1 MB to handle wide JSON payloads.
	scanner.Buffer(make([]byte, 1024*1024), 1024*1024)
	for scanner.Scan() {
		line := scanner.Text()
		switch {
		case strings.Contains(line, " ERR ") || strings.Contains(line, "level=error"):
			l.Error().Msg(line)
		case strings.Contains(line, " WRN ") || strings.Contains(line, "level=warning"):
			l.Warn().Msg(line)
		case strings.Contains(line, " INF ") || strings.Contains(line, "level=info"):
			l.Info().Msg(line)
		default:
			l.Debug().Msg(line)
		}
	}
	if err := scanner.Err(); err != nil {
		l.Error().Err(err).Msg("log scanner error")
	}
}