package imap

import (
	"github.com/emersion/go-imap"
	sortthread "github.com/emersion/go-imap-sortthread"

	"git.sr.ht/~sircmpwn/aerc/worker/types"
)

func (imapw *IMAPWorker) handleOpenDirectory(msg *types.OpenDirectory) {
	imapw.worker.Logger.Printf("Opening %s", msg.Directory)

	_, err := imapw.client.Select(msg.Directory, false)
	if err != nil {
		imapw.worker.PostMessage(&types.Error{
			Message: types.RespondTo(msg),
			Error:   err,
		}, nil)
	} else {
		imapw.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
		if imapw.idleStop == nil {
			imapw.idleStop = make(chan struct{})
		}
	}
}

func (imapw *IMAPWorker) handleFetchDirectoryContents(
	msg *types.FetchDirectoryContents) {

	imapw.worker.Logger.Printf("Fetching UID list")

	seqSet := &imap.SeqSet{}
	seqSet.AddRange(1, imapw.selected.Messages)
	uids, err := imapw.client.UidSearch(&imap.SearchCriteria{
		SeqNum: seqSet,
	})
	if err != nil {
		imapw.worker.PostMessage(&types.Error{
			Message: types.RespondTo(msg),
			Error:   err,
		}, nil)
	} else {
		imapw.worker.Logger.Printf("Found %d UIDs", len(uids))
		imapw.seqMap = make([]uint32, len(uids))
		imapw.worker.PostMessage(&types.DirectoryContents{
			Message: types.RespondTo(msg),
			Uids:    uids,
		}, nil)
		imapw.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
	}
}

func (imapw *IMAPWorker) handleNativeThreadSupport(
	msg *types.FetchNativeThreadSupport) {
	hasSupport, err := imapw.client.tc.SupportThread()
	if err != nil {
		imapw.worker.PostMessage(&types.Error{
			Message: types.RespondTo(msg),
			Error:   err,
		}, nil)
	} else {
		imapw.worker.PostMessage(&types.NativeThreadSupport{
			Message:    types.RespondTo(msg),
			HasSupport: hasSupport,
		}, nil)
		imapw.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
	}
}

func (imapw *IMAPWorker) handleDirectoryThreaded(
	msg *types.FetchDirectoryThreaded) {
	imapw.worker.Logger.Printf("Fetching threaded UID list")

	seqSet := &imap.SeqSet{}
	seqSet.AddRange(1, imapw.selected.Messages)
	threads, err := imapw.client.tc.UidThread(sortthread.References,
		&imap.SearchCriteria{SeqNum: seqSet})
	if err != nil {
		imapw.worker.PostMessage(&types.Error{
			Message: types.RespondTo(msg),
			Error:   err,
		}, nil)
	} else {
		root := &types.Thread{
			Uid:   0,
			Dummy: true,
		}
		aercThreads, count := convertThreads(threads, root)
		root.Children = aercThreads
		imapw.seqMap = make([]uint32, count)
		imapw.worker.PostMessage(&types.DirectoryThreaded{
			Message:    types.RespondTo(msg),
			ThreadRoot: root,
		}, nil)
		imapw.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
	}
}

// This sucks... TODO: find a better way to do this.
func convertThreads(threads []*sortthread.Thread, parent *types.Thread) ([]*types.Thread, int) {
	if threads == nil {
		return nil, 0
	}
	conv := make([]*types.Thread, len(threads))
	count := 0

	for i := 0; i < len(threads); i++ {
		t := threads[i]
		conv[i] = &types.Thread{
			Uid:   t.Id,
			Dummy: false,
		}
		conv[i].Parent = parent
		children, childCount := convertThreads(t.Children, conv[i])
		conv[i].Children = children
		count += childCount + 1
	}
	return conv, count
}