/*
 * This file is part of the Flowee project
 * Copyright (C) 2020-2021 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 2.11
import QtQuick.Controls 2.11
import QtQuick.Layouts 1.11
import QtQuick.Window 2.11

import Flowee.org.pay 1.0
import "./ControlColors.js" as ControlColors

Rectangle {
    id: root
    function reset() {
        // reset fields
        bitcoinValueField.reset();
        bitcoinValueField.maxSelected = false;
        destination.forceLegacyOk = false;
        destination.text = "";
        destination.updateColor();
        delete root.payment;
        root.payment = null;
    }
    color: mainWindow.palette.window

    property QtObject payment: null

    Column {
        x: 10
        y: 10
        spacing: 10
        width: parent.width - 20
        Label {
            text: qsTr("Destination") + ":"
            Layout.columnSpan: 2
        }
        RowLayout {
            width: parent.width
            FloweeTextField {
                id: destination
                focus: true
                property bool addressOk: addressType === Pay.CashPKH || (forceLegacyOk && addressType === Pay.LegacyPKH)
                property var addressType: Flowee.identifyString(text);
                property bool forceLegacyOk: false

                placeholderText: qsTr("Enter Bitcoin Cash Address")
                Layout.fillWidth: true
                Layout.columnSpan: 3

                onFocusChanged: updateColor();
                onAddressOkChanged: updateColor()

                function updateColor() {
                    if (!activeFocus && text !== "" && !addressOk)
                        color = Flowee.useDarkSkin ? "#ff6568" : "red"
                    else
                        color = mainWindow.palette.text
                }

            }
            Label {
                id: checked
                color: "green"

                font.pixelSize: 24
                text: destination.addressOk ? "✔" : " "
            }
        }

        Label {
            id: payAmount
            text: qsTr("Amount") + ":"
        }
        RowLayout {
            /* TODO hook this up when we add fiat support.
            FloweeTextField {
                text: "0.0 EUR"
            }
            FloweeCheckBox {
                id: amountSelector
            }
            */
            BitcoinValueField {
                id: bitcoinValueField
                property bool maxSelected: false
                property string previousAmountString: ""

                fontPtSize: payAmount.font.pointSize
                onValueChanged: maxSelected = false

                function update(setToMax) {
                    if (setToMax) {
                        // backup what the user typed there, to be used if she no longer wants 'max'
                        previousAmountString = bitcoinValueField.valueObject.enteredString;
                        value = portfolio.current.balanceConfirmed + portfolio.current.balanceUnconfirmed
                    } else {
                        valueObject.strValue = previousAmountString
                    }
                }
                Connections {
                    target: portfolio
                    function onCurrentChanged() {
                        var setToMax = bitcoinValueField.maxSelected
                        if (setToMax) {
                            bitcoinValueField.update(setToMax);
                            bitcoinValueField.maxSelected = setToMax; // undo any changes in the button
                        }
                    }
                }
            }
            Button2 {
                id: sendAll
                text: qsTr("Max")
                checkable: true
                checked: bitcoinValueField.maxSelected

                onClicked: {
                    var isChecked = !bitcoinValueField.maxSelected // simply invert
                    bitcoinValueField.update(isChecked);
                    bitcoinValueField.maxSelected = isChecked
                }
            }
        }

        RowLayout {
            width: parent.width
            /* TODO future feature.
            Button2 {
                text: qsTr("Add Advanced Option...")
            }
            */

            Item {
                width: 1; height: 1
                Layout.fillWidth: true
            }

            Button2 {
                id: prepareButton
                text: qsTr("Prepare")
                enabled: (bitcoinValueField.value > 0
                          || bitcoinValueField.maxSelected) && destination.addressOk;

                property QtObject portfolioUsed: null

                onClicked: {
                    if (bitcoinValueField.maxSelected)
                        var payment = portfolio.startPayAllToAddress(destination.text);
                    else
                        payment = portfolio.startPayToAddress(destination.text, bitcoinValueField.valueObject);
                    delete root.payment;
                    root.payment = payment;
                    payment.approveAndSign();
                    portfolioUsed = portfolio.current
                }
            }
        }
        Label {
            text: qsTr("Not enough funds in account to make payment!")
            visible: root.payment != null && !root.payment.paymentOk
        }

        FloweeGroupBox {
            id: txDetails
            Layout.columnSpan: 4
            title: qsTr("Transaction Details")
            width: parent.width


            content: GridLayout {
                columns: 2
                property bool txOk: root.payment != null && root.payment.paymentOk

                Label {
                    text: qsTr("Destination") + ":"
                    Layout.alignment: Qt.AlignRight
                    visible: finalDestination.visible
                }
                Label {
                    id: finalDestination
                    text: root.payment == null ? "" : root.payment.formattedTargetAddress
                    wrapMode: Text.WrapAnywhere
                    Layout.fillWidth: true
                    visible: text !== "" && text != destination.text
                }
                Label {
                    // no need translating this one.
                    text: "TxId:"
                    Layout.alignment: Qt.AlignRight | Qt.AlignTop
                }

                LabelWithClipboard {
                    text: root.payment == null ? qsTr("Not prepared yet") : root.payment.txid
                    Layout.fillWidth: true
                }
                Label {
                    text: qsTr("Fee") + ":"
                    Layout.alignment: Qt.AlignRight
                }

                BitcoinAmountLabel {
                    value: !parent.txOk ? 0 : root.payment.assignedFee
                    colorize: false
                }
                Label {
                    text: qsTr("Transaction size") + ":"
                    Layout.alignment: Qt.AlignRight
                }
                Label {
                    text: {
                        if (!parent.txOk)
                            return "";
                        var rc = root.payment.txSize;
                        return qsTr("%1 bytes", "", rc).arg(rc)
                    }
                }
                Label {
                    text: qsTr("Fee per byte") + ":"
                    Layout.alignment: Qt.AlignRight
                }
                Label {
                    text: {
                        if (!parent.txOk)
                            return "";
                        var rc = root.payment.assignedFee / root.payment.txSize;

                        var fee = rc.toFixed(3); // no more than 3 numbers behind the separator
                        fee = (fee * 1.0).toString(); // remove trailing zero's (1.000 => 1)
                        return qsTr("%1 sat/byte", "fee", rc).arg(fee);
                    }
                }
            }
        }

        RowLayout {
            width: parent.width

            Item {
                width: 1; height: 1
                Layout.fillWidth: true
            }

            Button2 {
                id: button
                text: qsTr("Send")
                enabled: root.payment != null && root.payment.paymentOk
                            && prepareButton.portfolioUsed === portfolio.current // also make sure we prepared for the current portfolio.
                onClicked: {
                    root.payment.sendTx();
                    root.payment = null
                    reset();
                }
            }
            Button2 {
                text: qsTr("Cancel")
                onClicked: root.reset();
            }
        }
    }
    Item {
        // overlay item
        anchors.fill: parent
        Item {
            // BTC address warning.
            visible: destination.addressType === Pay.LegacyPKH && destination.forceLegacyOk === false;
            onVisibleChanged: {
                var pos = parent.mapFromItem(destination, 0, destination.height);
                // console.log("xxxx " + pos.x + ", " + pos.y);
                x = pos.x + 20
                y = pos.y + 25
            }

            width: destination.width - 40
            height: warningColumn.height + 20
            Rectangle {
                anchors.fill: warningColumn
                anchors.margins: -10
                color: warning.palette.window
                border.width: 3
                border.color: "red"
                radius: 10
            }
            ArrowPoint {
                x: 40
                anchors.bottom: warningColumn.top
                anchors.bottomMargin: 5
                rotation: -90
                color: "red"
            }

            Column {
                id: warningColumn
                x: 10
                width: parent.width - 20
                spacing: 10
                Label {
                    font.bold: true
                    font.pixelSize: warning.font.pixelSize * 1.2
                    text: qsTr("Warning")
                }
                Label {
                    id: warning
                    width: parent.width
                    text: qsTr("This is a request to pay to a BTC address, which is an incompatible coin. Your funds could get lost and Flowee will have no way to recover them. Are you sure you want to pay to this BTC address?")
                    wrapMode: Text.WrapAtWordBoundaryOrAnywhere
                }

                RowLayout {

                    width: parent.width
                    Item {
                        width: 1; height: 1
                        Layout.fillWidth: true
                    }

                    Button {
                        text: qsTr("Yes, I am sure")
                        onClicked: destination.forceLegacyOk = true
                    }
                    Button {
                        text: qsTr("No")
                        onClicked: {
                            destination.text = ""
                            destination.updateColor()
                        }
                    }
                }
            }
        }
    }
}