package tui

import (
	"os"
	"os/exec"
	"strings"

	tea "github.com/charmbracelet/bubbletea"
)

type msgTempfileEditorClosed string

// openTempfileEditor opens an $EDITOR on a new temporary file with the given
// content. Upon closing, the contents of the file are read back returned
// wrapped in a msgTempfileEditorClosed returned by the tea.Cmd
func openTempfileEditor(pattern string, content string, placeholder string) tea.Cmd {
	msgFile, _ := os.CreateTemp("/tmp", pattern)

	err := os.WriteFile(msgFile.Name(), []byte(placeholder+content), os.ModeAppend)
	if err != nil {
		return wrapError(err)
	}

	editor := os.Getenv("EDITOR")
	if editor == "" {
		editor = "vim"
	}

	c := exec.Command(editor, msgFile.Name())
	return tea.ExecProcess(c, func(err error) tea.Msg {
		bytes, err := os.ReadFile(msgFile.Name())
		if err != nil {
			return msgError(err)
		}
		os.Remove(msgFile.Name())
		fileContents := string(bytes)
		if strings.HasPrefix(fileContents, placeholder) {
			fileContents = fileContents[len(placeholder):]
		}
		stripped := strings.Trim(fileContents, "\n \t")
		return msgTempfileEditorClosed(stripped)
	})
}