package util

import (
	"context"
	"errors"
	"git-roast/internal/log"
	"io"
	"os"
	"os/exec"
	"strings"
	"time"
)

func Textedit(text string) (string, error) {
	f, err := os.CreateTemp("", "git-roast-*.md")
	if err != nil {
		return text, errors.Join(errors.New("failed to create initial message in request"), err)
	}
	fp := f.Name()
	defer os.Remove(fp)
	_, _ = f.Write([]byte(text))
	f.Close()
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Minute)
	defer cancel()
	ed := editor()
	log.Debugf("editing message using %s\n", ed)
	edCmd := exec.CommandContext(ctx, ed, fp)
	edCmd.Stderr = os.Stderr
	edCmd.Stdout = os.Stdout
	edCmd.Stdin = os.Stdin
	if err := edCmd.Run(); err != nil {
		return text, errors.Join(errors.New("failed to run text editor"), err)
	}

	f, err = os.OpenFile(fp, os.O_RDONLY|os.O_SYNC, 0)
	if err != nil {
		return text, errors.Join(errors.New("failed to open temp file"), err)
	}
	defer f.Close()

	newContent, err := io.ReadAll(f)
	if err != nil {
		return text, errors.Join(errors.New("failed to read from temp file"), err)
	}
	return string(newContent), nil
}

func editor() string {
	if gitCoreEditor, err := exec.Command("git", "config", "--global", "core.editor").Output(); err == nil {
		return strings.TrimSpace(string(gitCoreEditor))
	}
	if gitEditor, ok := os.LookupEnv("GIT_EDITOR"); ok {
		return gitEditor
	}
	if editor, ok := os.LookupEnv("EDITOR"); ok {
		return editor
	}

	return "vim"
}