package msgview

import (
	"encoding/base64"
	"errors"
	"fmt"
	"io"
	"mime/quotedprintable"
	"strings"

	"git.sr.ht/~sircmpwn/aerc/commands"
	"git.sr.ht/~sircmpwn/aerc/widgets"
)

type Pipe struct{}

func init() {
	register(Pipe{})
}

func (_ Pipe) Aliases() []string {
	return []string{"pipe"}
}

func (_ Pipe) Complete(aerc *widgets.Aerc, args []string) []string {
	return nil
}

func (_ Pipe) Execute(aerc *widgets.Aerc, args []string) error {
	if len(args) < 2 {
		return errors.New("Usage: :pipe <cmd> [args...]")
	}

	mv := aerc.SelectedTab().(*widgets.MessageViewer)
	p := mv.CurrentPart()

	p.Store.FetchBodyPart(p.Msg.Uid, p.Index, func(reader io.Reader) {
		// email parts are encoded as 7bit (plaintext), quoted-printable, or base64
		if strings.EqualFold(p.Part.Encoding, "base64") {
			reader = base64.NewDecoder(base64.StdEncoding, reader)
		} else if strings.EqualFold(p.Part.Encoding, "quoted-printable") {
			reader = quotedprintable.NewReader(reader)
		}

		term, err := commands.QuickTerm(aerc, args[1:], reader)
		if err != nil {
			aerc.PushError(" " + err.Error())
			return
		}
		name := fmt.Sprintf("%s <%s/[%d]", args[1], p.Msg.Envelope.Subject, p.Index)
		aerc.NewTab(term, name)
	})

	return nil
}