package prd

import (
	"bufio"
	"os"
	"strings"
)

type Task struct {
	Title     string
	Completed bool
	Index     int
}

func ParseTasks(filepath string) ([]Task, error) {
	file, err := os.Open(filepath)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	var tasks []Task
	index := 0
	scanner := bufio.NewScanner(file)

	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if strings.HasPrefix(line, "- [ ] ") {
			tasks = append(tasks, Task{
				Title:     strings.TrimPrefix(line, "- [ ] "),
				Completed: false,
				Index:     index,
			})
			index++
		} else if strings.HasPrefix(line, "- [x] ") {
			tasks = append(tasks, Task{
				Title:     strings.TrimPrefix(line, "- [x] "),
				Completed: true,
				Index:     index,
			})
			index++
		}
	}
	return tasks, scanner.Err()
}

func MarkTaskComplete(filepath string, taskTitle string) error {
	content, err := os.ReadFile(filepath)
	if err != nil {
		return err
	}

	updated := strings.ReplaceAll(
		string(content),
		"- [ ] "+taskTitle,
		"- [x] "+taskTitle,
	)
	return os.WriteFile(filepath, []byte(updated), 0644)
}