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 CustomQmlTypes 1.0

import "../opaque" as Opaque
import "../opaque/controls" as Awesome
import "../utils.js" as Utils
import "../widgets" as W
import "../opaque/theme"

W.Overlay {
	id: overlayRoot
    property bool loading
    property string historyState: "DefaultDeleteHistory"

    //horizontalPadding: 15 * gcd.themeScale

    Connections {
        target: mm
        onRowsInserted: {
            if (messagesListView.atYEnd) thymer.running = true
        }
    }

    // onRowsInserted is firing after the model is updated but before the delegate is inflated
    // causing positionViewAtEnd() to scroll to "just above the last message"
    // so we use this timer to delay scrolling by a few milliseconds
    Timer {
        id: thymer
        interval: 30
        onTriggered: {
            thymer.running = false
            messagesListView.positionViewAtEnd()
        }
    }

    contentItem: ListView {
        id: messagesListView

        Layout.fillWidth: true

        width: parent.width
        model: mm
        spacing: 6

        clip: true
        ScrollBar.vertical: Opaque.ScrollBar {id:scrollbar}
        maximumFlickVelocity: 1250

        section.delegate: sectionHeading
        section.property: "Day"

        header: Component {
        	Column {
        		width: messagesListView.width

				Label {
					id: historyWarning
					wrapMode: Text.WordWrap
					width: messagesListView.width
					font.pointSize: Theme.textSmallPt
					font.weight: Font.Bold
					color: Theme.chatOverlayWarningTextColor
					horizontalAlignment: Text.AlignHCenter
					//: This conversation will be deleted when Cwtch is closed! Message history can be enabled per-conversation via the Settings menu in the upper right.
					text: overlayRoot.historyState == "DefaultDeleteHistory" ? qsTr("chat-history-default") : (
					      //: Message history is disabled.
					      overlayRoot.historyState == "DeleteHistoryConfirmed" ? qsTr("chat-history-disabled") :
					      //: Message history is enabled.
					      qsTr("chat-history-enabled")
					)
				}

				Loader {
					anchors.horizontalCenter: parent.horizontalCenter
					height: overlayRoot.historyState == "DefaultDeleteHistory" ? Theme.uiIconSizeM : 0
					sourceComponent: overlayRoot.historyState == "DefaultDeleteHistory" ? settingsIcon : undefined
				}

				Component {
					id: settingsIcon
					Opaque.Icon {
						backgroundColor: Theme.backgroundMainColor
						iconColor: Theme.chatOverlayWarningTextColor
						source: gcd.assetPath + "core/peer_settings-24px.webp"
						size: Theme.uiIconSizeM
						sourceWidth: 72
						sourceHeight: 72
						width: Theme.uiIconSizeM
						height: Theme.uiIconSizeM
					}
				}

				Opaque.HLine {}
			}
        }

        delegate: W.Message {
        	// unusual msg... syntax is due to qt stack weirdnesses
        	// model injection doesn't work properly because MessageWrapper uses tagged QML properties
        	// but reverting to struct properties prevents us from using mm.getMessage() in onRowsInserted sooooo
        	property variant msg: mm.getMessage(index)
        	property variant obj: JSON.parse(msg.rawMessage)
        	visible: obj.o == 1
        	height: visible ? implicitHeight : -messagesListView.spacing
            handle: msg.peerID
            from: msg.peerID
            displayName: mm.getNick(msg.peerID)
            message: obj.o == 1 ? obj.d : ""
            rawMessage: msg.rawMessage
            image: mm.getImage(msg.peerID)
            messageID: msg.signature
            fromMe: msg.peerID == gcd.selectedProfile
            timestamp: parseInt(msg.timestamp)
            ackd: acknowledged
            error: msg.error
            calendarEvent: msg.peerID == "calendar"
            // listview doesnt do anchors right
            // https://stackoverflow.com/questions/31381997/why-does-anchors-fill-does-not-work-in-a-qml-listviews-delegates-subviews-and/31382307
            width: messagesListView.width - scrollbar.width
        }

        Component {
            id: sectionHeading
            Rectangle {// ⟵ outer rect because anchors._Margin isnt supported here
                // with qt 5.15+ this↓ can be changed to...
                // required property string section
                property string txt: section
                color: Theme.backgroundMainColor
                width: parent.width
                height: texmet.height + 6 + 12// * gcd.themeScale
                anchors.horizontalCenter: parent.horizontalCenter


                Rectangle {
                    opacity: 1
                    width: texmet.width + radius * 4 + 6
                    height: texmet.height + 6
                    color: Theme.messageFromOtherBackgroundColor
                    radius: texmet.height / 2
                    anchors.horizontalCenter: parent.horizontalCenter
                    anchors.verticalCenter: parent.verticalCenter


                    Text {
                        id: txtDate
                        // ... and this can be changed to
                        // text: parent.parent.section
                        text: parent.parent.txt
                        font.pixelSize: Theme.chatSize * gcd.themeScale
                        color: Theme.messageFromOtherTextColor
                        anchors.horizontalCenter: parent.horizontalCenter
                        anchors.verticalCenter: parent.verticalCenter
                    }

                    TextMetrics {
                        id: texmet
                        text: txtDate.text
                        font.pixelSize: Theme.chatSize * gcd.themeScale
                    }
                }
            }
        }

        Connections {
            target: gcd

            onClearMessages: function() {
                messagesListView.model = null
                messagesListView.model = mm
                messagesListView.positionViewAtEnd()
                thymer.running = true
            }

			onSupplyPeerSettings: function(onion, nick, authorization, saveHistory) {
				overlayRoot.historyState = saveHistory
			}
        }
    }


    onSendClicked: function(messageText) {
        var msg = JSON.stringify({"o":1, "d":messageText.replace(/\[\:newline\:\]/g,"\n")})
        gcd.sendMessage(msg)
    }
}