package caddyhugo

import (
	"fmt"
	"io/ioutil"
	"os"
	"os/exec"

	"git.stephensearles.com/stephen/idleshut"
)

type HugoInteractor interface {
	Render(srcdir, workdir string) HugoRenderer
}

type HugoRenderer interface {
	WriteContent(contents string) error
	Start() error
	Stop() error
}

func HugoCmdProcessConfig(ch *CaddyHugo, es *editSession, touchFn func()) idleshut.Config {
	cmd := exec.Command("hugo", "--watch", "-D", "-d", es.tmpdir)
	cmd.Dir = es.tmpdir

	return idleshut.Config{
		Tick:         WebsocketFileTicker,
		MaxIdleTicks: uint(IdleWebsocketTimeout/WebsocketFileTicker) + 1,
		Start: func() error {

			err := cmd.Start()
			if err != nil {
				return fmt.Errorf("error starting hugo: %v", err)
			}

			return nil
		},
		Stop: func() error {
			if cmd == nil {
				return nil
			}

			err := cmd.Process.Signal(os.Interrupt)
			if err != nil {
				return fmt.Errorf("error signalling hugo to stop: %v", err)
			}
			err = cmd.Wait()
			if err != nil {
				return fmt.Errorf("error waiting for hugo to stop: %v", err)
				return err
			}

			es.doc.Close()
			os.RemoveAll(es.tmpdir)
			delete(ch.docs, es.filename)

			return nil
		},
		IdleProcessError: func(err error) {
			fmt.Println("error processing draft:", err)
		},
		IdleTick: func() error {
			return ioutil.WriteFile(es.filename, []byte(es.doc.Contents()), 0644)
		},
		ActiveTick: func() error {
			return ioutil.WriteFile(es.filename, []byte(es.doc.Contents()), 0644)
		},
	}
}