import QtGraphicalEffects 1.0
import QtQuick 2.7
import QtQuick.Controls 2.4
import QtQuick.Controls.Material 2.0
import QtQuick.Layouts 1.3

import "../widgets"
import "../widgets/controls" as Awesome
import "../fonts/Twemoji.js" as T
import "../utils.js" as Utils

ColumnLayout {
	Layout.fillWidth: true

	Flickable { // THE MESSAGE LIST ITSELF
		id: sv
		clip: true
		Layout.alignment: Qt.AlignLeft | Qt.AlignTop
		Layout.fillHeight: true
		Layout.fillWidth: true
		contentWidth: colMessages.width
		contentHeight: colMessages.height
		boundsBehavior: Flickable.StopAtBounds
		maximumFlickVelocity: 800


		Connections {
			target: gcd

			onClearMessages: function() {
				messagesModel.clear()
				txtMessage.text = ""
			}

			onAppendMessage: function(handle, from, displayName, message, image, mid, fromMe, ts, ackd) {
			    var msg
			    try {
			        msg = JSON.parse(message)
			    } catch (e) {
			        msg = {"o": 1, "d": "(legacy message type) " + message}
			    }
			    if (msg.o != 1) return


				messagesModel.append({
					"_handle": handle,
					"_from": from,
					"_displayName": displayName,
					"_message":parse(msg.d, 12),
					"_image": image,
					"_mid": mid,
					"_fromMe": fromMe,
					"_ts": ts,
					"_ackd": ackd,
				})



				// If the window is out of focus, alert the user (makes taskbar light up)
				windowItem.alert(0)

				if (sv.contentY + sv.height >= sv.contentHeight - colMessages.height && sv.contentHeight > sv.height) {
					sv.contentY = sv.contentHeight - sv.height
				}
			}
		}


		ScrollBar.vertical: ScrollBar{
			policy: ScrollBar.AlwaysOn
		}

        ColumnLayout {
			id: colMessages
			width: sv.width


			ListModel { // MESSAGE OBJECTS ARE STORED HERE ...
				id: messagesModel
			}

			Item { height: 6 }

			Repeater { // ... AND DISPLAYED HERE
				model: messagesModel
				delegate: Message {
					handle: _handle
					from: _from
					displayName: _displayName
					message: _message
					image: _image
					messageID: _mid
					fromMe: _fromMe
					timestamp: _ts
					ackd: _ackd
				}
			}
		}
	}

	RowLayout { // THE BOTTOM DRAWER
		Rectangle { // MESSAGE ENTRY TEXTFIELD
			id: rectMessage
			Layout.fillWidth: true
			Layout.minimumHeight: 40 * gcd.themeScale
			Layout.maximumHeight: 40 * gcd.themeScale
			color: "#EDEDED"
			border.color: "#AAAAAA"
			radius: 10


			Flickable {
				id: flkMessage
				anchors.fill: parent//this does nothing! bug in qt
				Layout.minimumWidth: parent.width
				Layout.maximumWidth: parent.width
				Layout.minimumHeight: rectMessage.height
				Layout.maximumHeight: rectMessage.height
				contentWidth: txtMessage.width
				contentHeight: txtMessage.height
				boundsBehavior: Flickable.StopAtBounds
				clip:true
				maximumFlickVelocity: 300


				ScrollBar.vertical: ScrollBar{}

				TextEdit {
					id: txtMessage
					font.pixelSize: 10
					text: ""
					padding: 6
					wrapMode: TextEdit.Wrap
					textFormat: Text.RichText
					width: rectMessage.width

					property bool skipOneUpdate: false

					Keys.onReturnPressed: { // CTRL+ENTER = LINEBREAK
						if (event.modifiers & Qt.ControlModifier) {
							txtMessage.insert(txtMessage.cursorPosition, "<br>")
						} else if (event.modifiers == Qt.NoModifier) {
							btnSend.clicked()
						}
					}

					// welcome to the emoji parser! it is horrifying code that needs to leave in <img src="[emoji]">
					// while also stripping any other tag, including other images.
					// TODO: this probably breaks if people actually do want to paste html
					onTextChanged: {
						//console.log("onTextChanged()")

						// we're taking advantage of TextEdit.getText()'s parsing capability, which means occasionally
						// passing text into it to be filtered. this prevents recursive calls putting us into an
						// infinite loop
						if (skipOneUpdate) {
							skipOneUpdate = false
							return
						}

						//console.log("1: " + txtMessage.getText(0, txtMessage.text.length))

						// convert <img> tags back to their emoji form
						// Then parse out the rest of the HTML
						var nt = restoreEmoji(txtMessage.text)
						if (nt != txtMessage.text) {
							skipOneUpdate = true
							txtMessage.text = nt
						}

						//console.log("2: " + txtMessage.getText(0, txtMessage.text.length))

						// strip all HTML tags
						var theText = Utils.htmlEscaped(txtMessage.getText(0, txtMessage.text.length))
						//console.log("3: " + theText)

						// convert emoji back to <img> tags
						nt = parse(theText, 10)
						//console.log("4: " + nt)


						// first we need to update the cursor position to be the same distance from the end
						var oldcursor = txtMessage.cursorPosition
						var oldlen = txtMessage.getText(0, txtMessage.text.length).length

						// then we actually put the updated text in
						skipOneUpdate = true
						txtMessage.text = nt

						// and then restore the cursor
						var newlen = txtMessage.getText(0, txtMessage.text.length).length
						txtMessage.cursorPosition = newlen - (oldlen - oldcursor)


						// autoscroll down only when the scrollbar is already all the way down
						if (flkMessage.contentY + flkMessage.height >= flkMessage.contentHeight - txtMessage.height && flkMessage.contentHeight > flkMessage.height) {
							flkMessage.contentY = flkMessage.contentHeight - flkMessage.height
						}
					}
				}
			}

			MouseArea {
				anchors.fill: parent
				onClicked: txtMessage.focus = true
			}
		}

		ColumnLayout {
			id: colRight
			spacing: 1


			SimpleButton { // SEND MESSAGE BUTTON
				id: btnSend
				icon: "regular/paper-plane"
				text: "send"
				Layout.minimumWidth: btnEmoji.width + btnAttach.width + 2
				Layout.maximumWidth: btnEmoji.width + btnAttach.width + 2
				anchors.right: parent.right
				anchors.rightMargin: 2

				property int nextMessageID: 1

				TextEdit {
					id: txtHidden
					visible: false
					textFormat: Text.RichText
				}

				onClicked: {
					if (txtMessage.text != "") {
						txtHidden.text = restoreEmoji(txtMessage.text)
						var txt = txtHidden.getText(0, txtHidden.text.length).trim()
						if (txt.length > 0) {
							var msg = JSON.stringify({"o":1, "d":txtHidden.getText(0, txtHidden.text.length)})
							gcd.sendMessage(msg, nextMessageID++)
						}
					}
					txtMessage.text = ""
				}
			}

			RowLayout {
				spacing: 1


				SimpleButton { // EMOJI DRAWER BUTTON
					id: btnEmoji
					icon: "regular/smile"
					anchors.right: btnAttach.left
					anchors.rightMargin: 2

					onClicked: gcd.popup("emoji not yet implemented, sorry")
				}

				SimpleButton {
					id: btnAttach
					icon: "solid/paperclip"
					anchors.right: parent.right
					anchors.rightMargin: 2

					onClicked: {
						gcd.popup("attachments not yet implemented, sorry")
					}
				}
			}
		}
	}
}