/*
 * This file is part of the Flowee project
 * Copyright (C) 2022-2024 Tom Zander <tom@flowee.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
import QtQuick
import QtQuick.Controls as QQC2
import "../Flowee" as Flowee
import Flowee.org.pay

FocusScope {
    id: root
    property string icon: "qrc:/receive.svg"
    property string title: qsTr("Receive")
    property bool showInstructions: true
    property QtObject account: portfolio.current
    property bool qrViewActive: true;
    property bool editViewActive: false
    focus: true

    PaymentRequest {
        id: request
        amount: priceInput.paymentBackend.paymentAmount
        onAmountSeenChanged: feedback.hide = false;
    }

    onAccountChanged: {
        var state = request.state;
        if (request.state === PaymentRequest.Unpaid) {
            // I can only change the wallet without cost
            // if no payment has been seen.
            request.account = account;
        }
    }

    onActiveFocusChanged: {
        // starting reserves an adderess, don't do that until
        // this tab is actually viewed.
        if (activeFocus)
            request.start();
    }
    Column {
        id: verticalTabs
        y: 50
        x: -10
        enabled: feedback.opacity < 0.1
        Repeater {
            model: ["qr-code", "edit-money", "edit-pen"]
            MouseArea {
                property bool active: index === swipeView.currentIndex
                width: 50
                height: 50
                onClicked: swipeView.moveTo(index);

                Rectangle {
                    x: 46
                    y: 5
                    width: 4
                    height: 40
                    color: palette.highlight
                    visible: parent.active
                }
                Rectangle {
                    anchors.fill: parent
                    color: palette.highlight
                    visible: parent.active
                    opacity: 0.15
                }
                Image {
                    anchors.fill: parent
                    anchors.margins: 10
                    source: "qrc:/" + modelData + (Pay.useDarkSkin ? "-light" : "") + ".svg"
                    smooth: true
                    opacity: enabled ? 1 : 0.4
                }
            }

        }
    }

    Flowee.Label {
        id: instructions
        anchors.horizontalCenter: parent.horizontalCenter
        text: qsTr("Share this QR to receive")
        opacity: editViewActive ? 0 : 0.5
        Behavior on opacity { OpacityAnimator { } }
        visible: root.showInstructions
    }
    Flowee.QRWidget {
        id: qr
        width: parent.width
        y: root.showInstructions ? instructions.height : 0
        qrSize: {
            var avail = root.height - y - swipeView.height;
            return Math.min(256, avail);
        }
        textVisible: false
        qrText: request.qr

        Flowee.Label {
            visible: request.failReason !== PaymentRequest.NoFailure
            text: {
                var f = request.failReason;
                if (f === PaymentRequest.AccountEncrypted)
                    return qsTr("Encrypted Wallet");
                if (f === PaymentRequest.AccountImporting)
                    return qsTr("Import Running...");
                if (f === PaymentRequest.NoAccountSet)
                    return "No Account Set"; // not translated b/c cause is bug in QML
                return "";
            }
            anchors.centerIn: parent
            width: parent.width - 40
            wrapMode: Text.WrapAtWordBoundaryOrAnywhere
            font.pointSize: 18
        }
    }
    QQC2.SwipeView {
        id: swipeView
        width: parent.width + 20 // to ensure swiped pages are wide enough
        x: -10
        height: {
            var have = parent.height - (showInstructions ? instructions.height : 0) - 256; // qr is ideally 256
            if (currentIndex === 1)
                return Math.max(have, priceInput.implicitHeight + 215);
            return have - 6; // spacing of 6
        }
        anchors.bottom: parent.bottom

        onCurrentIndexChanged: currentItem.doFocus();
        function moveTo(index) {
            forceActiveFocus();
            currentIndex = index;
            currentItem.doFocus();
        }


        Item {
            function doFocus() { }
            Column {
                width: parent.width - 20
                x: 10

                Flowee.BitcoinAmountLabel {
                    visible: value > 0
                    colorize: false
                    value: request.amount
                    font.pixelSize: instructions.font.pixelSize * 1.4
                    anchors.horizontalCenter: parent.horizontalCenter
                }

                PageTitledBox {
                    width: parent.width
                    title: qsTr("Address", "Bitcoin Cash address")
                    Flowee.LabelWithClipboard {
                        width: parent.width
                        text: request.addressShort
                        fontSizeMode: Text.HorizontalFit
                    }
                }

                Flowee.Button {
                    anchors.right: parent.right
                    text: qsTr("Clear")
                    enabled: description.totalText !== "" || priceInput.paymentBackend.paymentAmount > 0;
                    onClicked: {
                        request.clear();
                        request.account = portfolio.current;
                        description.text = "";
                        priceInput.paymentBackend.paymentAmount = 0;
                        request.start();
                    }
                }
            }
        }

        Item {
            function doFocus() { priceInput.takeFocus(); }

            PriceInputWidget {
                id: priceInput
                fiatFollowsSats: false
                width: parent.width

                Connections {
                    target: Fiat
                    /*
                     * The price may change simply because the market moved and we re-cheked the server,
                     * but more important is the case where the user changed which currency they use.
                     */
                    function onPriceChanged() {
                        // set the value again to trigger an updated exchange-rate calculation to happen.
                        var price = priceInput.editor.value;
                        if (priceInput.fiatFollowsSats)
                            priceInput.paymentBackend.paymentAmount = price;
                        else
                            priceInput.paymentBackend.paymentAmountFiat = price;
                    }
                }
            }

            Rectangle {
                width: parent.width
                anchors.bottom: parent.bottom
                color: palette.base
                height: 215
            }
            NumericKeyboardWidget {
                width: parent.width
                height: 200
                anchors.bottom: parent.bottom
                anchors.bottomMargin: 10
                onFinished: passwordData.finished();
                dataInput: priceInput

                buttonBackground: Item {
                    property int index: 0
                    property bool pressed: false
                }
            }
        }

        Item {
            function doFocus() { description.forceActiveFocus(); }
            Column {
                width: parent.width - 20
                x: 10
                spacing: 10
                Flowee.BitcoinAmountLabel {
                    anchors.horizontalCenter: parent.horizontalCenter
                    visible: value > 0
                    colorize: false
                    value: request.amount
                    font.pixelSize: instructions.font.pixelSize * 1.4
                }
                PageTitledBox {
                    width: parent.width
                    title: qsTr("Description")
                    Flowee.TextField {
                        id: description
                        width: parent.width
                        onTotalTextChanged: request.message = totalText
                    }
                }
            }
        }
    }

    // the "payment received" screen.
    Rectangle {
        id: feedback
        property bool hide: false // hide a partially paid popup

        anchors.fill: swipeView
        gradient: Gradient {
            GradientStop {
                position: 0.6
                color: {
                    var state = request.state;
                    if (state === PaymentRequest.PaymentSeen || state === PaymentRequest.Unpaid)
                        return palette.base
                    if (state === PaymentRequest.DoubleSpentSeen)
                        return mainWindow.errorRedBg
                    return "#60b671" // in all other cases: green
                }
                Behavior on color { ColorAnimation {} }
            }
            GradientStop {
                position: 0.01
                color: palette.base
            }
        }
        opacity: hide || request.state === PaymentRequest.Unpaid ? 0: 1
        enabled: opacity > 0
        visible: opacity > 0

        // animating timer to indicate our checking the security of the transaction.
        // (i.e. waiting for the double spent proof)
        Flowee.Label {
            color: "green"
            text: "✔"
            // y: 60
            y: -30 // basically avoid the xheight
            x: 30
            opacity: {
                if (request.state === PaymentRequest.PaymentSeenOk || request.state === PaymentRequest.Confirmed)
                    return 1;
                return 0;
            }
            font.pixelSize: 130
        }
        // textual feedback
        Flowee.Label {
            text: qsTr("Payment Seen") + " (" + ((request.amountSeen / request.amount) * 100).toFixed(2) + " %)"
            y: 70
            x: 20
            opacity: request.state === PaymentRequest.PartiallyPaid ? 1 : 0
        }

        Flowee.Label {
            id: feedbackLabel
            text: {
                var s = request.state;
                if (s === PaymentRequest.DoubleSpentSeen) // double-spent-proof received
                    return qsTr("High risk transaction");
                if (s === PaymentRequest.PartiallyPaid)
                    return qsTr("Partially Paid");
                if (s === PaymentRequest.PaymentSeen)
                    return qsTr("Payment Seen");
                if (s === PaymentRequest.PaymentSeenOk)
                    return qsTr("Payment Accepted");
                if (s === PaymentRequest.Confirmed)
                    return qsTr("Payment Settled");
                return "INTERNAL ERROR";
            }
            width: parent.width - 40
            anchors.horizontalCenter: parent.horizontalCenter
            y: 100
            wrapMode: Text.WrapAtWordBoundaryOrAnywhere
            font.pointSize: 20
        }
        Behavior on opacity { OpacityAnimator {} }

        Flowee.BigCloseButton {
            anchors.bottom: parent.bottom
            anchors.bottomMargin: 20
            onClicked: {
                request.clear();
                description.text = "";
                priceInput.paymentBackend.paymentAmount = 0;
                request.account = portfolio.current;
                request.start();
                feedback.hide = false;
                switchToTab(0); // go to the 'main' tab.
            }
            visible: request.state !== PaymentRequest.PartiallyPaid
        }

        Flowee.Button {
            anchors.right: parent.right
            anchors.rightMargin: 10
            y: 160
            text: qsTr("Continue")
            visible: request.state === PaymentRequest.PartiallyPaid
            onClicked: feedback.hide = true;
        }
    }
}