package main

import (
	"fmt"
	"io/fs"
	"os"
	"path/filepath"
	"strings"

	"github.com/charmbracelet/bubbles/list"
)

var rootDirectory string

func validateName(name string) error {
	return nil // TODO
}

func setupDB() error {
	rootDirectory = os.ExpandEnv("$HOME/.doe/")
	stat, err := os.Lstat(rootDirectory)
	if err != nil {
		err := os.Mkdir(rootDirectory, 0750)
		if err != nil {
			return fmt.Errorf("error creating root directory: %s", err)
		}
	} else if !stat.Mode().IsDir() {
		return fmt.Errorf("~/.doe exists, but is not a directory")
	}

	return nil
}

func saveSnippet(snippet snippetDetails) error {
	if snippet.name != snippet.prevName && snippet.prevName != "" {
		err := deleteItem(item{title: snippet.prevName, contents: ""})
		if err != nil {
			return err
		}
	}

	fullPath := filepath.Join(rootDirectory, snippet.name)

	parentDirectory, _ := filepath.Split(fullPath)
	stat, err := os.Lstat(parentDirectory)
	if err != nil || !stat.Mode().IsDir() {
		err = os.MkdirAll(parentDirectory, 0750)
		if err != nil {
			return fmt.Errorf("error creating parent directory: %s", err)
		}
	}

	f, err := os.Create(fullPath)
	if err != nil {
		return fmt.Errorf("error creating new file: %s", err)
	}
	defer f.Close()

	err = f.Chmod(0750)
	if err != nil {
		return fmt.Errorf("error setting file mode: %s", err)
	}

	n, err := f.WriteString(snippet.contents)
	if err != nil || n != len(snippet.contents) {
		return fmt.Errorf("error writing snippet contents: %s", err)
	}

	return nil
}

func getItems() ([]list.Item, error) {
	items := []list.Item{}
	err := filepath.WalkDir(rootDirectory, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() {
			return nil
		} else {
			contents, err := os.ReadFile(path)
			if err != nil {
				return err
			}

			items = append(items, item{
				title:    strings.TrimPrefix(path, rootDirectory),
				contents: string(contents),
			})

			return nil
		}

	})
	if err != nil {
		return nil, err
	}

	return items, nil
}

func deleteItem(item item) error {
	err := os.Remove(filepath.Join(rootDirectory, item.title))
	if err != nil {
		return fmt.Errorf("error removing old file: %s", err)
	}

	return nil
}