package model

import (
	"fmt"
	"strings"
	"time"
)

type Entry struct {
	Timestamp  string
	Hostname   string
	WorkingDir string
	Command    string
}

// ParseLine parses a log line in "TIMESTAMP HOSTNAME DIR COMMAND..." format.
func ParseLine(line string) (Entry, error) {
	line = strings.TrimSpace(line)
	if line == "" {
		return Entry{}, fmt.Errorf("empty line")
	}

	// Split into at most 4 parts: timestamp, hostname, dir, command(rest)
	parts := strings.SplitN(line, " ", 4)
	if len(parts) < 4 {
		return Entry{}, fmt.Errorf("malformed line: %q", line)
	}

	ts := parts[0]
	if _, err := time.Parse(time.RFC3339, ts); err != nil {
		return Entry{}, fmt.Errorf("invalid timestamp %q: %w", ts, err)
	}

	if parts[1] == "" || parts[2] == "" || parts[3] == "" {
		return Entry{}, fmt.Errorf("empty field in line: %q", line)
	}

	return Entry{
		Timestamp:  ts,
		Hostname:   parts[1],
		WorkingDir: parts[2],
		Command:    parts[3],
	}, nil
}

// Format returns the entry in log format: "TIMESTAMP HOSTNAME DIR COMMAND"
func (e Entry) Format() string {
	return fmt.Sprintf("%s %s %s %s", e.Timestamp, e.Hostname, e.WorkingDir, e.Command)
}