package jp.juggler.subwaytooter.util

import android.content.SharedPreferences
import android.os.Handler
import android.os.SystemClock
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import android.text.*
import android.text.style.ForegroundColorSpan
import android.view.View
import jp.juggler.emoji.EmojiMap
import jp.juggler.subwaytooter.App1
import jp.juggler.subwaytooter.Pref
import jp.juggler.subwaytooter.R
import jp.juggler.subwaytooter.Styler
import jp.juggler.subwaytooter.api.*
import jp.juggler.subwaytooter.api.entity.*
import jp.juggler.subwaytooter.dialog.ActionsDialog
import jp.juggler.subwaytooter.dialog.DlgConfirm
import jp.juggler.subwaytooter.dialog.EmojiPicker
import jp.juggler.subwaytooter.span.MyClickableSpan
import jp.juggler.subwaytooter.span.NetworkEmojiSpan
import jp.juggler.subwaytooter.table.AcctColor
import jp.juggler.subwaytooter.table.AcctSet
import jp.juggler.subwaytooter.table.SavedAccount
import jp.juggler.subwaytooter.table.TagSet
import jp.juggler.subwaytooter.view.MyEditText
import jp.juggler.util.*
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
import java.lang.ref.WeakReference
import java.util.*
import kotlin.math.min

class PostHelper(
	private val activity: AppCompatActivity,
	private val pref: SharedPreferences,
	private val handler: Handler
) {

    companion object {

        private val log = LogCategory("PostHelper")

        private val reCharsNotEmoji = "[^0-9A-Za-z_-]".asciiPattern()
        private val reAscii = """[\x00-\x7f]""".asciiPattern()
        private val reNotAscii = """[^\x00-\x7f]""".asciiPattern()

    }

    interface PostCompleteCallback {

        fun onPostComplete(target_account: SavedAccount, status: TootStatus)
        fun onScheduledPostComplete(target_account: SavedAccount)
    }

    ///////////////////////////////////////////////////////////////////////////////////
    // 投稿機能

    var content: String? = null
    var spoiler_text: String? = null
    var visibility: TootVisibility = TootVisibility.Public
    var bNSFW = false
    var in_reply_to_id: EntityId? = null
    var attachment_list: ArrayList<PostAttachment>? = null
    var enquete_items: ArrayList<String>? = null
    var poll_type: TootPollsType? = null
    var poll_expire_seconds = 0
    var poll_hide_totals = false
    var poll_multiple_choice = false

    var emojiMapCustom: HashMap<String, CustomEmoji>? = null
    var redraft_status_id: EntityId? = null
    var useQuoteToot = false
    var scheduledAt = 0L
    var scheduledId: EntityId? = null

    private var last_post_tapped: Long = 0L

    private var last_post_task: WeakReference<TootTaskRunner>? = null

    fun post(account: SavedAccount, callback: PostCompleteCallback) = post(
		account,
		callback,
		bConfirmTag = false,
		bConfirmAccount = false,
		bConfirmRedraft = false,
		bConfirmTagCharacter = false
	)

    fun post(
		account: SavedAccount,
		callback: PostCompleteCallback,
		bConfirmTag: Boolean,
		bConfirmAccount: Boolean,
		bConfirmRedraft: Boolean,
		bConfirmTagCharacter: Boolean
	) {
        val content = this.content ?: ""
        val spoiler_text = this.spoiler_text
        val bNSFW = this.bNSFW
        val in_reply_to_id = this.in_reply_to_id
        val attachment_list = this.attachment_list
        val enquete_items = this.enquete_items
        val poll_type = this.poll_type
        val poll_expire_seconds = this.poll_expire_seconds
        val poll_hide_totals = this.poll_hide_totals
        val poll_multiple_choice = this.poll_multiple_choice

        val visibility = this.visibility
        val scheduledAt = this.scheduledAt

        val hasAttachment = attachment_list?.isNotEmpty() ?: false

        if (!hasAttachment && content.isEmpty()) {
            activity.showToast(true, R.string.post_error_contents_empty)
            return
        }

        // nullはCWチェックなしを示す
        // nullじゃなくてカラならエラー
        if (spoiler_text != null && spoiler_text.isEmpty()) {
            activity.showToast(true, R.string.post_error_contents_warning_empty)
            return
        }

        if (enquete_items?.isNotEmpty() == true) {

            val choice_max_chars = when {
                account.isMisskey -> 15
                poll_type == TootPollsType.FriendsNico -> 15
                else -> 25 // TootPollsType.Mastodon
            }

            for (n in 0 until enquete_items.size) {
                val item = enquete_items[n]

                if (item.isEmpty()) {
                    if (n < 2) {
                        activity.showToast(true, R.string.enquete_item_is_empty, n + 1)
                        return
                    }
                } else {
                    val code_count = item.codePointCount(0, item.length)
                    if (code_count > choice_max_chars) {
                        val over = code_count - choice_max_chars
                        activity.showToast(true, R.string.enquete_item_too_long, n + 1, over)
                        return
                    } else if (n > 0) {
                        for (i in 0 until n) {
                            if (item == enquete_items[i]) {
                                activity.showToast(true, R.string.enquete_item_duplicate, n + 1)
                                return
                            }
                        }
                    }
                }
            }
        }

        if (!bConfirmAccount) {
            DlgConfirm.open(
				activity,
				activity.getString(R.string.confirm_post_from, AcctColor.getNickname(account)),
				object : DlgConfirm.Callback {
					override var isConfirmEnabled: Boolean
						get() = account.confirm_post
						set(bv) {
							account.confirm_post = bv
							account.saveSetting()
						}

					override fun onOK() {
						post(
							account, callback,
							bConfirmTag = bConfirmTag,
							bConfirmAccount = true,
							bConfirmRedraft = bConfirmRedraft,
							bConfirmTagCharacter = bConfirmTagCharacter
						)
					}
				})
            return
        }

        if (!bConfirmTagCharacter && Pref.bpWarnHashtagAsciiAndNonAscii(App1.pref)) {
            val tags = TootTag.findHashtags(content, account.isMisskey)
            val badTags = tags
                ?.filter {
                    val hasAscii = reAscii.matcher(it).find()
                    val hasNotAscii = reNotAscii.matcher(it).find()
                    hasAscii && hasNotAscii
                }
                ?.map { "#$it" }
            if (badTags?.isNotEmpty() == true) {

                AlertDialog.Builder(activity)
                    .setCancelable(true)
                    .setMessage(
						activity.getString(
							R.string.hashtag_contains_ascii_and_not_ascii,
							badTags.joinToString(", ")
						)
					)
                    .setNegativeButton(R.string.cancel, null)
                    .setPositiveButton(R.string.ok) { _, _ ->
                        post(
							account, callback,
							bConfirmTag = bConfirmTag,
							bConfirmAccount = bConfirmAccount,
							bConfirmRedraft = bConfirmRedraft,
							bConfirmTagCharacter = true
						)
                    }
                    .show()
                return
            }
        }

        if (!bConfirmTag) {
            val isMisskey = account.isMisskey
            if (!visibility.isTagAllowed(isMisskey)) {
                val tags = TootTag.findHashtags(content, isMisskey)
                if (tags != null) {

                    log.d("findHashtags ${tags.joinToString(",")}")

                    AlertDialog.Builder(activity)
                        .setCancelable(true)
                        .setMessage(R.string.hashtag_and_visibility_not_match)
                        .setNegativeButton(R.string.cancel, null)
                        .setPositiveButton(R.string.ok) { _, _ ->
                            post(
								account, callback,
								bConfirmTag = true,
								bConfirmAccount = bConfirmAccount,
								bConfirmRedraft = bConfirmRedraft,
								bConfirmTagCharacter = bConfirmTagCharacter
							)
                        }
                        .show()
                    return
                }
            }
        }

        if (!bConfirmRedraft && redraft_status_id != null) {
            AlertDialog.Builder(activity)
                .setCancelable(true)
                .setMessage(R.string.delete_base_status_before_toot)
                .setNegativeButton(R.string.cancel, null)
                .setPositiveButton(R.string.ok) { _, _ ->
                    post(
						account, callback,
						bConfirmTag = bConfirmTag,
						bConfirmAccount = bConfirmAccount,
						bConfirmRedraft = true,
						bConfirmTagCharacter = bConfirmTagCharacter
					)
                }
                .show()
            return
        }
        if (!bConfirmRedraft && scheduledId != null) {
            AlertDialog.Builder(activity)
                .setCancelable(true)
                .setMessage(R.string.delete_scheduled_status_before_update)
                .setNegativeButton(R.string.cancel, null)
                .setPositiveButton(R.string.ok) { _, _ ->
                    post(
						account, callback,
						bConfirmTag = bConfirmTag,
						bConfirmAccount = bConfirmAccount,
						bConfirmRedraft = true,
						bConfirmTagCharacter = bConfirmTagCharacter
					)
                }
                .show()
            return
        }
        // 確認を終えたらボタン連打判定

        if (last_post_task?.get()?.isActive == true) {
            activity.showToast(false, R.string.post_button_tapped_repeatly)
            return
        }

        val now = SystemClock.elapsedRealtime()
        val delta = now - last_post_tapped
        last_post_tapped = now
        if (delta < 1000L) {
            activity.showToast(false, R.string.post_button_tapped_repeatly)
            return
        }

        // 全ての確認を終えたらバックグラウンドでの処理を開始する
        last_post_task = WeakReference(
			TootTaskRunner(activity,
				progressSetupCallback = { progressDialog ->
					progressDialog.setCanceledOnTouchOutside(false)
				}
			).run(account, object : TootTask {

				var status: TootStatus? = null

				var credential_tmp: TootAccount? = null

				var scheduledStatusSucceeded = false

				suspend fun getCredential(
					client: TootApiClient,
					parser: TootParser
				): TootApiResult? {
					val result = client.request("/api/v1/accounts/verify_credentials")
					credential_tmp = parser.account(result?.jsonObject)
					return result
				}

				override suspend fun background(client: TootApiClient): TootApiResult? {
					val parser = TootParser(activity, account)

					var result: TootApiResult?


					val (instance, ri) = TootInstance.get(client)
					instance ?: return ri

					var visibility_checked: TootVisibility? = visibility

					if (visibility == TootVisibility.WebSetting) {
						visibility_checked =
							if (account.isMisskey || instance.versionGE(TootInstance.VERSION_1_6)) {
								null
							} else {
								val r2 = getCredential(client, parser)
								val credential_tmp = this.credential_tmp ?: return r2
								val privacy = credential_tmp.source?.privacy
									?: return TootApiResult(activity.getString(R.string.cant_get_web_setting_visibility))
								TootVisibility.parseMastodon(privacy)
							}
					}

					for (pair in arrayOf(
						Pair(TootVisibility.Mutual, InstanceCapability.VisibilityMutual),
						Pair(TootVisibility.Limited, InstanceCapability.VisibilityLimited),
					)) {
						val (checkVisibility, checkCapability) = pair
						if (visibility == checkVisibility &&
							!instance.hasCapability(checkCapability)
						) {
							val strVisibility = Styler.getVisibilityString(activity, account.isMisskey, checkVisibility)
							return TootApiResult(activity.getString(R.string.server_has_no_support_of_visibility, strVisibility))
						}
					}


					// 元の投稿を削除する
					if (redraft_status_id != null) {
						result = if (account.isMisskey) {
							client.request(
								"/api/notes/delete",
								account.putMisskeyApiToken(JsonObject()).apply {
									put("noteId", redraft_status_id)
								}.toPostRequestBuilder()
							)
						} else {
							client.request(
								"/api/v1/statuses/$redraft_status_id",
								Request.Builder().delete()
							)
						}
						log.d("delete redraft. result=$result")
						Thread.sleep(2000L)

					} else if (scheduledId != null) {
						val r1 = client.request(
							"/api/v1/scheduled_statuses/$scheduledId",
							Request.Builder().delete()
						)
						log.d("delete old scheduled status. result=$r1")
						Thread.sleep(2000L)
					}

					if (instance.instanceType == InstanceType.Pixelfed) {
						if (in_reply_to_id != null && attachment_list?.isNotEmpty() == true) {
							return TootApiResult(activity.getString(R.string.pixelfed_does_not_allow_reply_with_media))
						}
						if (in_reply_to_id == null && attachment_list?.isNotEmpty() != true) {
							return TootApiResult(activity.getString(R.string.pixelfed_does_not_allow_post_without_media))
						}
					}


					val json = JsonObject()
					try {
						if (account.isMisskey) {
							account.putMisskeyApiToken(json)
							json["text"] = EmojiDecoder.decodeShortCode(
								content,
								emojiMapCustom = emojiMapCustom
							)
							if (visibility_checked != null) {

								if (visibility_checked == TootVisibility.DirectSpecified ||
									visibility_checked == TootVisibility.DirectPrivate
								) {
									val userIds = JsonArray()

									val m = TootAccount.reMisskeyMentionPost.matcher(content)
									while (m.find()) {
										val username = m.groupEx(1)
										val host = m.groupEx(2) // may null

										result = client.request(
											"/api/users/show",
											account.putMisskeyApiToken().apply {
												if (username?.isNotEmpty() == true)
													put("username", username)
												if (host?.isNotEmpty() == true)
													put("host", host)
											}.toPostRequestBuilder()
										)
										val id = result?.jsonObject?.string("id")
										if (id?.isNotEmpty() == true) {
											userIds.add(id)
										}
									}
									json["visibility"] = when {
										userIds.isNotEmpty() -> {
											json["visibleUserIds"] = userIds
											"specified"
										}

										account.misskeyVersion >= 11 -> "specified"
										else -> "private"
									}
								} else {
									val localVis = visibility_checked.strMisskey.replace(
										"^local-".toRegex(),
										""
									)
									if (localVis != visibility_checked.strMisskey) {
										json["localOnly"] = true
										json["visibility"] = localVis
									} else {
										json["visibility"] = visibility_checked.strMisskey
									}
								}
							}

							if (spoiler_text?.isNotEmpty() == true) {
								json["cw"] = EmojiDecoder.decodeShortCode(
									spoiler_text,
									emojiMapCustom = emojiMapCustom
								)
							}

							if (in_reply_to_id != null) {
								if (useQuoteToot) {
									json["renoteId"] = in_reply_to_id.toString()
								} else {
									json["replyId"] = in_reply_to_id.toString()
								}
							}

							json["viaMobile"] = true

							if (attachment_list != null) {
								val array = JsonArray()
								for (pa in attachment_list) {
									val a = pa.attachment ?: continue
									// Misskeyは画像の再利用に問題がないので redraftとバージョンのチェックは行わない
									array.add(a.id.toString())

									// Misskeyの場合、NSFWするにはアップロード済みの画像を drive/files/update で更新する
									if (bNSFW) {
										val r = client.request(
											"/api/drive/files/update",
											account.putMisskeyApiToken().apply {
												put("fileId", a.id.toString())
												put("isSensitive", true)
											}
												.toPostRequestBuilder()
										)
										if (r == null || r.error != null) return r
									}
								}
								if (array.isNotEmpty()) json["mediaIds"] = array
							}

							if (enquete_items?.isNotEmpty() == true) {
								val choices = JsonArray().apply {
									for (item in enquete_items) {
										val text = EmojiDecoder.decodeShortCode(
											item,
											emojiMapCustom = emojiMapCustom
										)
										if (text.isEmpty()) continue
										add(text)
									}
								}
								if (choices.isNotEmpty()) {
									json["poll"] = jsonObject {
										put("choices", choices)
									}
								}
							}

							if (scheduledAt != 0L) {
								return TootApiResult("misskey has no scheduled status API")
							}

						} else {
							json["status"] = EmojiDecoder.decodeShortCode(
								content,
								emojiMapCustom = emojiMapCustom
							)
							if (visibility_checked != null) {
								json["visibility"] = visibility_checked.strMastodon
							}
							json["sensitive"] = bNSFW
							json["spoiler_text"] = EmojiDecoder.decodeShortCode(
								spoiler_text ?: "",
								emojiMapCustom = emojiMapCustom
							)

							if (in_reply_to_id != null) {
								if (useQuoteToot) {
									json["quote_id"] = in_reply_to_id.toString()
								} else {
									json["in_reply_to_id"] = in_reply_to_id.toString()
								}
							}

							if (attachment_list != null) {
								json["media_ids"] = jsonArray {
									for (pa in attachment_list) {
										val a = pa.attachment ?: continue
										if (a.redraft && !instance.versionGE(TootInstance.VERSION_2_4_1)) continue
										add(a.id.toString())
									}
								}
							}

							if (enquete_items?.isNotEmpty() == true) {
								if (poll_type == TootPollsType.Mastodon) {
									json["poll"] = jsonObject {
										put("multiple", poll_multiple_choice)
										put("hide_totals", poll_hide_totals)
										put("expires_in", poll_expire_seconds)
										put("options",
											enquete_items.map {
												EmojiDecoder.decodeShortCode(
													it,
													emojiMapCustom = emojiMapCustom
												)
											}
												.toJsonArray()
										)
									}
								} else {
									json["isEnquete"] = true
									json["enquete_items"] = enquete_items.map {
										EmojiDecoder.decodeShortCode(
											it,
											emojiMapCustom = emojiMapCustom
										)
									}.toJsonArray()
								}
							}

							if (scheduledAt != 0L) {
								if (!instance.versionGE(TootInstance.VERSION_2_7_0_rc1)) {
									return TootApiResult(activity.getString(R.string.scheduled_status_requires_mastodon_2_7_0))
								}
								// UTCの日時を渡す
								val c = GregorianCalendar.getInstance(TimeZone.getTimeZone("UTC"))
								c.timeInMillis = scheduledAt
								val sv = String.format(
									"%d-%02d-%02d %02d:%02d:%02d",
									c.get(Calendar.YEAR),
									c.get(Calendar.MONTH) + 1,
									c.get(Calendar.DAY_OF_MONTH),
									c.get(Calendar.HOUR_OF_DAY),
									c.get(Calendar.MINUTE),
									c.get(Calendar.SECOND)
								)
								json["scheduled_at"] = sv
							}

						}
					} catch (ex: JsonException) {
						log.trace(ex)
						log.e(ex, "status encoding failed.")
					}

					val body_string = json.toString()

					val request_builder = body_string.toRequestBody(MEDIA_TYPE_JSON).toPost()

					if (!Pref.bpDontDuplicationCheck(pref)) {
						val digest = (body_string + account.acct.ascii).digestSHA256Hex()
						request_builder.header("Idempotency-Key", digest)
					}

					result = if (account.isMisskey) {
						// log.d("misskey json %s", body_string)
						client.request("/api/notes/create", request_builder)
					} else {
						client.request("/api/v1/statuses", request_builder)
					}

					val jsonObject = result?.jsonObject

					if (scheduledAt != 0L && jsonObject != null) {
						// {"id":"3","scheduled_at":"2019-01-06T07:08:00.000Z","media_attachments":[]}
						scheduledStatusSucceeded = true
						return result
					}

					val status = parser.status(
						if (account.isMisskey) {
							result?.jsonObject?.jsonObject("createdNote") ?: result?.jsonObject
						} else {
							result?.jsonObject
						}
					)
					this.status = status
					if (status != null) {

						// タグを覚えておく
						val s = status.decoded_content
						val span_list = s.getSpans(0, s.length, MyClickableSpan::class.java)
						if (span_list != null) {
							val tag_list = ArrayList<String?>(span_list.size)
							for (span in span_list) {
								val start = s.getSpanStart(span)
								val end = s.getSpanEnd(span)
								val text = s.subSequence(start, end).toString()
								if (text.startsWith("#")) {
									tag_list.add(text.substring(1))
								}
							}
							val count = tag_list.size
							if (count > 0) {
								TagSet.saveList(System.currentTimeMillis(), tag_list, 0, count)
							}

						}

					}
					return result
				}

				override suspend fun handleResult(result: TootApiResult?) {
					result ?: return
					val status = this.status
					when {
						status != null -> {
							// 連投してIdempotency が同じだった場合もエラーにはならず、ここを通る
							callback.onPostComplete(account, status)
							return
						}

						scheduledStatusSucceeded -> {
							callback.onScheduledPostComplete(account)
							return

						}

						else -> activity.showToast(true, result.error)
					}
				}
			})
		)
    }

    ///////////////////////////////////////////////////////////////////////////////////
    // 入力補完機能

    private val picker_caption_emoji: String by lazy {
        activity.getString(R.string.open_picker_emoji)
    }
    //	private val picker_caption_tag : String by lazy {
    //		activity.getString(R.string.open_picker_tag)
    //	}
    //	private val picker_caption_mention : String by lazy {
    //		activity.getString(R.string.open_picker_mention)
    //	}

    private var callback2: Callback2? = null
    private var et: MyEditText? = null
    private var popup: PopupAutoCompleteAcct? = null
    private var formRoot: View? = null
    private var bMainScreen: Boolean = false

    private var accessInfo: SavedAccount? = null

    private val onEmojiListLoad: (list: ArrayList<CustomEmoji>) -> Unit =
        {
            val popup = this@PostHelper.popup
            if (popup?.isShowing == true) proc_text_changed.run()
        }

    private val proc_text_changed = object : Runnable {

        override fun run() {
            val et = this@PostHelper.et
            if (et == null // EditTextを特定できない
                || et.selectionStart != et.selectionEnd // 範囲選択中
                || callback2?.canOpenPopup() != true // 何らかの理由でポップアップが許可されていない
            ) {
                closeAcctPopup()
                return
            }

            checkMention(et, et.text.toString())
        }

        private fun checkMention(et: MyEditText, src: String) {

            fun matchUserNameOrAsciiDomain(cp: Int): Boolean {
                if (cp >= 0x7f) return false
                val c = cp.toChar()

                return '0' <= c && c <= '9' ||
                    'A' <= c && c <= 'Z' ||
                    'a' <= c && c <= 'z' ||
                    c == '_' || c == '-' || c == '.'
            }

            // Letter | Mark | Decimal_Number | Connector_Punctuation
            fun matchIdnWord(cp: Int) = when (Character.getType(cp).toByte()) {
                // Letter
                // LCはエイリアスなので文字から得られることはないはず
				Character.UPPERCASE_LETTER,
				Character.LOWERCASE_LETTER,
				Character.TITLECASE_LETTER,
				Character.MODIFIER_LETTER,
				Character.OTHER_LETTER -> true
                // Mark
				Character.NON_SPACING_MARK,
				Character.COMBINING_SPACING_MARK,
				Character.ENCLOSING_MARK -> true
                // Decimal_Number
				Character.DECIMAL_DIGIT_NUMBER -> true
                // Connector_Punctuation
				Character.CONNECTOR_PUNCTUATION -> true

                else -> false
            }

            var count_atMark = 0
            val end = et.selectionEnd
            var start: Int = -1
            var i = end
            while (i > 0) {
                val cp = src.codePointBefore(i)
                i -= Character.charCount(cp)

                if (cp == '@'.toInt()) {
                    start = i
                    if (++count_atMark >= 2) break else continue
                } else if (count_atMark == 1) {
                    // @username@host の username部分はUnicodeを含まない
                    if (matchUserNameOrAsciiDomain(cp)) continue else break
                } else {
                    // @username@host のhost 部分か、 @username のusername部分
                    // ここはUnicodeを含むかもしれない
                    if (matchUserNameOrAsciiDomain(cp) || matchIdnWord(cp)) continue else break
                }
            }

            if (start == -1) {
                checkTag(et, src)
                return
            }

            // 最低でも2文字ないと補完しない
            if (end - start < 2) {
                closeAcctPopup()
                return
            }

            val limit = 100
            val s = src.substring(start, end)
            val acct_list = AcctSet.searchPrefix(s, limit)
            log.d("search for %s, result=%d", s, acct_list.size)
            if (acct_list.isEmpty()) {
                closeAcctPopup()
            } else {
                openPopup()?.setList(et, start, end, acct_list, null, null)
            }
        }

        private fun checkTag(et: MyEditText, src: String) {

            val end = et.selectionEnd

            val last_sharp = src.lastIndexOf('#', end - 1)

            if (last_sharp == -1 || end - last_sharp < 2) {
                checkEmoji(et, src)
                return
            }

            val part = src.substring(last_sharp + 1, end)
            if (!TootTag.isValid(part, accessInfo?.isMisskey == true)) {
                checkEmoji(et, src)
                return
            }

            val limit = 100
            val s = src.substring(last_sharp + 1, end)
            val tag_list = TagSet.searchPrefix(s, limit)
            log.d("search for %s, result=%d", s, tag_list.size)
            if (tag_list.isEmpty()) {
                closeAcctPopup()
            } else {
                openPopup()?.setList(et, last_sharp, end, tag_list, null, null)
            }
        }

        private fun checkEmoji(et: MyEditText, src: String) {

            val end = et.selectionEnd
            val last_colon = src.lastIndexOf(':', end - 1)
            if (last_colon == -1 || end - last_colon < 1) {
                closeAcctPopup()
                return
            }

            if (!EmojiDecoder.canStartShortCode(src, last_colon)) {
                // : の手前は始端か改行か空白でなければならない
                log.d("checkEmoji: invalid character before shortcode.")
                closeAcctPopup()
                return
            }

            val part = src.substring(last_colon + 1, end)

            if (part.isEmpty()) {
                // :を入力した直後は候補は0で、「閉じる」と「絵文字を選ぶ」だけが表示されたポップアップを出す
                openPopup()?.setList(
					et, last_colon, end, null, picker_caption_emoji, open_picker_emoji
				)
                return
            }

            if (reCharsNotEmoji.matcher(part).find()) {
                // 範囲内に絵文字に使えない文字がある
                closeAcctPopup()
                return
            }

            val code_list = ArrayList<CharSequence>()
            val limit = 100

            // カスタム絵文字の候補を部分一致検索
            code_list.addAll(customEmojiCodeList(accessInfo, limit, part))

            // 通常の絵文字を部分一致で検索
            val remain = limit - code_list.size
            if (remain > 0) {
                val s =
                    src.substring(last_colon + 1, end).toLowerCase(Locale.JAPAN).replace('-', '_')
                val matches = EmojiDecoder.searchShortCode(activity, s, remain)
                log.d("checkEmoji: search for %s, result=%d", s, matches.size)
                code_list.addAll(matches)
            }

            openPopup()?.setList(
				et,
				last_colon,
				end,
				code_list,
				picker_caption_emoji,
				open_picker_emoji
			)
        }

        // カスタム絵文字の候補を作る
        private fun customEmojiCodeList(
			accessInfo: SavedAccount?,
			@Suppress("SameParameterValue") limit: Int,
			needle: String
		) = ArrayList<CharSequence>().also { dst ->

            accessInfo ?: return@also

            val custom_list =
                App1.custom_emoji_lister.getListWithAliases(accessInfo, onEmojiListLoad)
                    ?: return@also


            for (item in custom_list) {
                if (dst.size >= limit) break
                if (!item.shortcode.contains(needle)) continue

                val sb = SpannableStringBuilder()
                sb.append(' ')
                sb.setSpan(
					NetworkEmojiSpan(item.url),
					0,
					sb.length,
					Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
				)
                sb.append(' ')
                if (item.alias != null) {
                    val start = sb.length
                    sb.append(":")
                    sb.append(item.alias)
                    sb.append(": → ")
                    sb.setSpan(
						ForegroundColorSpan(activity.attrColor(R.attr.colorTimeSmall)),
						start,
						sb.length,
						Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
					)
                }

                sb.append(':')
                sb.append(item.shortcode)
                sb.append(':')

                dst.add(sb)
            }
        }
    }

    private fun openPopup(): PopupAutoCompleteAcct? {
        var popup = this@PostHelper.popup
        if (popup?.isShowing == true) return popup
        val et = this@PostHelper.et ?: return null
        val formRoot = this@PostHelper.formRoot ?: return null
        popup = PopupAutoCompleteAcct(activity, et, formRoot, bMainScreen)
        this@PostHelper.popup = popup
        return popup
    }

    interface Callback2 {

        fun onTextUpdate()

        fun canOpenPopup(): Boolean
    }

    fun setInstance(accessInfo: SavedAccount?) {
        this.accessInfo = accessInfo

        if (accessInfo != null) {
            App1.custom_emoji_lister.getList(accessInfo, onEmojiListLoad)
        }

        val popup = this.popup
        if (popup?.isShowing == true) {
            proc_text_changed.run()
        }
    }

    fun closeAcctPopup() {
        popup?.dismiss()
        popup = null
    }

    fun onScrollChanged() {
        if (popup?.isShowing == true) {
            popup?.updatePosition()
        }
    }

    fun onDestroy() {
        handler.removeCallbacks(proc_text_changed)
        closeAcctPopup()
    }

    fun attachEditText(
		_formRoot: View,
		et: MyEditText,
		bMainScreen: Boolean,
		_callback2: Callback2
	) {
        this.formRoot = _formRoot
        this.et = et
        this.callback2 = _callback2
        this.bMainScreen = bMainScreen

        et.addTextChangedListener(object : TextWatcher {
			override fun beforeTextChanged(
				s: CharSequence,
				start: Int,
				count: Int,
				after: Int
			) {

			}

			override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
				handler.removeCallbacks(proc_text_changed)
				handler.postDelayed(proc_text_changed, if (popup?.isShowing == true) 100L else 500L)
			}

			override fun afterTextChanged(s: Editable) {
				callback2?.onTextUpdate()
			}
		})

        et.setOnSelectionChangeListener(object : MyEditText.OnSelectionChangeListener {
			override fun onSelectionChanged(selStart: Int, selEnd: Int) {
				if (selStart != selEnd) {
					// 範囲選択されてるならポップアップは閉じる
					log.d("onSelectionChanged: range selected")
					closeAcctPopup()
				}
			}
		})

        // 全然動いてなさそう…
        // et.setCustomSelectionActionModeCallback( action_mode_callback );

    }

    private fun SpannableStringBuilder.appendEmoji(
		name: String,
		instance: String?,
		bInstanceHasCustomEmoji: Boolean
	): SpannableStringBuilder {

        val item = EmojiMap.shortNameToEmojiInfo[name]
        val separator = EmojiDecoder.customEmojiSeparator(pref)
        if (item == null || instance != null) {
            // カスタム絵文字は常にshortcode表現
            if (!EmojiDecoder.canStartShortCode(this, this.length)) append(separator)
            this.append(SpannableString(":$name:"))
            // セパレータにZWSPを使う設定なら、補完した次の位置にもZWSPを追加する。連続して入力補完できるようになる。
            if (separator != ' ') append(separator)
        } else if (!bInstanceHasCustomEmoji) {
            // 古いタンスだとshortcodeを使う。見た目は絵文字に変える。
            if (!EmojiDecoder.canStartShortCode(this, this.length)) append(separator)
            this.append(DecodeOptions(activity).decodeEmoji(":$name:"))
            // セパレータにZWSPを使う設定なら、補完した次の位置にもZWSPを追加する。連続して入力補完できるようになる。
            if (separator != ' ') append(separator)
        } else {
            // 十分に新しいタンスなら絵文字のunicodeを使う。見た目は絵文字に変える。
            this.append(DecodeOptions(activity).decodeEmoji(item.unified))
        }
        return this

    }

    private val open_picker_emoji: Runnable = Runnable {
        EmojiPicker(activity, accessInfo,
			closeOnSelected = Pref.bpEmojiPickerCloseOnSelected(pref)
		) { name, instance, bInstanceHasCustomEmoji, _, _ ->
            val et = this.et ?: return@EmojiPicker

            val src = et.text ?: ""
            val src_length = src.length
            val end = min(src_length, et.selectionEnd)
            val start = src.lastIndexOf(':', end - 1)
            if (start == -1 || end - start < 1) return@EmojiPicker

            val sb = SpannableStringBuilder()
                .append(src.subSequence(0, start))
                .appendEmoji(name, instance, bInstanceHasCustomEmoji)

            val newSelection = sb.length
            if (end < src_length) sb.append(src.subSequence(end, src_length))

            et.text = sb
            et.setSelection(newSelection)

            proc_text_changed.run()

            // キーボードを再度表示する
            App1.getAppState(
				activity,
				"PostHelper/EmojiPicker/cb"
			).handler.post { et.showKeyboard() }

        }.show()
    }

    fun openEmojiPickerFromMore() {
        EmojiPicker(activity, accessInfo,
			closeOnSelected = Pref.bpEmojiPickerCloseOnSelected(pref)
		) { name, instance, bInstanceHasCustomEmoji, _, _ ->
            val et = this.et ?: return@EmojiPicker

            val src = et.text ?: ""
            val src_length = src.length
            val start = min(src_length, et.selectionStart)
            val end = min(src_length, et.selectionEnd)

            val sb = SpannableStringBuilder()
                .append(src.subSequence(0, start))
                .appendEmoji(name, instance, bInstanceHasCustomEmoji)

            val newSelection = sb.length
            if (end < src_length) sb.append(src.subSequence(end, src_length))

            et.text = sb
            et.setSelection(newSelection)

            proc_text_changed.run()
        }.show()
    }

    private fun SpannableStringBuilder.appendHashTag(tagWithoutSharp: String): SpannableStringBuilder {
        val separator = ' '
        if (!EmojiDecoder.canStartHashtag(this, this.length)) append(separator)
        this.append('#').append(tagWithoutSharp)
        append(separator)
        return this
    }

    fun openFeaturedTagList(list: List<TootTag>?) {
        val ad = ActionsDialog()
        list?.forEach { tag ->
            ad.addAction("#${tag.name}") {
                val et = this.et ?: return@addAction

                val src = et.text ?: ""
                val src_length = src.length
                val start = min(src_length, et.selectionStart)
                val end = min(src_length, et.selectionEnd)

                val sb = SpannableStringBuilder()
                    .append(src.subSequence(0, start))
                    .appendHashTag(tag.name)
                val newSelection = sb.length
                if (end < src_length) sb.append(src.subSequence(end, src_length))

                et.text = sb
                et.setSelection(newSelection)

                proc_text_changed.run()
            }
        }
        ad.addAction(activity.getString(R.string.input_sharp_itself)) {
            val et = this.et ?: return@addAction

            val src = et.text ?: ""
            val src_length = src.length
            val start = min(src_length, et.selectionStart)
            val end = min(src_length, et.selectionEnd)

            val sb = SpannableStringBuilder()
            sb.append(src.subSequence(0, start))
            if (!EmojiDecoder.canStartHashtag(sb, sb.length)) sb.append(' ')
            sb.append('#')

            val newSelection = sb.length
            if (end < src_length) sb.append(src.subSequence(end, src_length))
            et.text = sb
            et.setSelection(newSelection)

            proc_text_changed.run()

        }
        ad.show(activity, activity.getString(R.string.featured_hashtags))
    }

    //	final ActionMode.Callback action_mode_callback = new ActionMode.Callback() {
    //		@Override public boolean onCreateActionMode( ActionMode actionMode, Menu menu ){
    //			actionMode.getMenuInflater().inflate(R.menu.toot_long_tap, menu);
    //			return true;
    //		}
    //		@Override public void onDestroyActionMode( ActionMode actionMode ){
    //
    //		}
    //		@Override public boolean onPrepareActionMode( ActionMode actionMode, Menu menu ){
    //			return false;
    //		}
    //
    //		@Override
    //		public boolean onActionItemClicked( ActionMode actionMode, MenuItem item ){
    //			if (item.getItemId() == R.id.action_pick_emoji) {
    //				actionMode.finish();
    //				EmojiPicker.open( activity, instance, new EmojiPicker.Callback() {
    //					@Override public void onPickedEmoji( String name ){
    //						int end = et.getSelectionEnd();
    //						String src = et.getText().toString();
    //						CharSequence svInsert = ":" + name + ":";
    //						src = src.substring( 0, end ) + svInsert + " " + ( end >= src.length() ? "" : src.substring( end ) );
    //						et.setText( src );
    //						et.setSelection( end + svInsert.length() + 1 );
    //
    //						proc_text_changed.run();
    //					}
    //				} );
    //				return true;
    //			}
    //
    //			return false;
    //		}
    //	};

}