/*
 * This file is part of the Flowee project
 * Copyright (C) 2023-2026 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.Basic as QQC2
import "../Flowee" as Flowee
import "../Utils.js" as Utils
import Flowee.org.pay

Item {
    property string icon: "qrc:/homeButtonIcon" + (Pay.useDarkSkin ? "-light.svg" : ".svg")
    property string title: qsTr("Home")
    property bool showFilterIcon: tabBar.currentIndex === 0
    property bool showAllWalletsOption: tabBar.currentIndex !== 0
    required property bool allWalletsEntrySelected

    property bool itIsChristmas: {
        var today = new Date()
        return today.getMonth() == 11 && today.getDate() >= 24 && today.getDate() <= 31
    }

    Rectangle {
        id: headerBg
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.top: parent.top
        anchors.bottom: tabBar.bottom
        anchors.bottomMargin: -6
        color: palette.window
        property var headerGradient: Gradient {
            GradientStop { position: 0.93; color: headerBg.color }
            GradientStop { position: 1; color: {
                    let c = headerBg.color
                    return Qt.rgba(c.r, c.g, c.b, 0)
                }
            }
        }
        gradient: tabBar.visible ? undefined : headerGradient
    }

    ListView {
        id: tabBar
        orientation: Qt.Horizontal
        width: parent.width
        height: {
            if (!visible || count <= 1 || currentItem === null)
                return 0
            return currentItem.height
        }
        property bool havePlannedTab: Pay.haveRepeatPayments
        property bool haveTokensTab: tokens.showTokenTab !== Wallet.AlwaysOff
        visible: count > 1

        function selectTab(index) {
            // fast move
            activityTabs.positionViewAtIndex(index, ListView.Beginning)
            // slow scroll
            currentIndex = index
        }

        clip: true
        boundsBehavior: Flickable.StopAtBounds
        model: ListModel {
            id: tabsModel
            ListElement {
                title: qsTr("Activity")
                qml: "AccountHistory.qml"
            }
        }
        onHavePlannedTabChanged: {
            if (!havePlannedTab)
                return
            tabBar.selectTab(0)
            for (let i = 1; i < tabsModel.count; ++i) {
                let tab = tabsModel.get(i)
                if (tab.qml === "PlannedPayments.qml")
                    return
            }
            tabsModel.append({ title: qsTr("Planned"), qml: "PlannedPayments.qml" })
        }
        onHaveTokensTabChanged: {
            tabBar.selectTab(0)
            for (let i = 1; i < tabsModel.count; ++i) {
                let tab = tabsModel.get(i)
                if (tab.qml === "TokensTab.qml") {
                    if (!haveTokensTab)
                        tabsModel.remove(i)
                    return
                }
            }
            if (haveTokensTab)
                tabsModel.insert(1, { title: qsTr("Tokens"), qml: "TokensTab.qml" })
        }

        delegate: Item {
            width: Math.max(tabName.width, 120)
            height: tabName.height + 20

            Rectangle {
                x: 5
                height: 4
                width: parent.width - 10
                color: palette.highlight
                visible: index === tabBar.currentIndex
                anchors.bottom: parent.bottom
            }
            Rectangle {
                anchors.fill: parent
                color: palette.highlight
                visible: index === tabBar.currentIndex
                opacity: 0.15
            }

            Text {
                id: tabName
                color: palette.windowText
                text: model.title
                anchors.centerIn: parent
            }
            MouseArea {
                anchors.fill: parent
                onClicked: tabBar.selectTab(index)
            }
        }
    }
    Rectangle {
        color: palette.base // background is dark.
        anchors.fill: activityTabs
    }
    ListView {
        id: activityTabs
        anchors.top: tabBar.bottom
        anchors.topMargin: tabBar.visible ? 0 : 6
        anchors.bottom: parent.bottom
        width: parent.width
        model: tabBar.model

        orientation: ListView.Horizontal
        snapMode: ListView.SnapOneItem
        onContentXChanged: tabBar.currentIndex = Math.round(contentX / width)
        boundsBehavior: Flickable.StopAtBounds
        onCurrentItemChanged: currentItem.makeActive()
        delegate: Loader {
            id: delegateRoot
            width: activityTabs.width
            height: activityTabs.height
            clip: true
            source: model.qml
            function makeActive() {
                if (item != null) {
                    if (typeof(item.active) != "undefined")
                        item.active = true
                    item.forceActiveFocus()
                }
            }
            Connections {
                target: tabBar
                function onCurrentIndexChanged() {
                    // let a tab know if it is currently active.
                    // as the user can slide between them, we can't use visible and tabs have
                    // a right to know if they are actually visible.
                    if (item != null && typeof(item.active) != "undefined")
                        item.active = index == tabBar.currentIndex
                }
            }
        }
    }
    Rectangle {
        id: startQRButton
        width: height
        height: {
            let i = activityTabs.itemAtIndex(tabBar.currentIndex)
            if (i != null && i.item !== null) { // at creation this is the case.
                let hide = i.item.hideQRScanButton
                if (typeof(hide) === "boolean" && hide)
                    return 0
            }
            return 70
        }
        radius: 35
        clip: true
        x: parent.width - width - 30 - (70 / 2 - width / 2) // almost right, but keep this centered around the max width
        y: parent.height - height - 15 - (70 / 2 - height / 2)
        color: mainWindow.floweeBlue

        Image {
            source: "qrc:/qr-code-scan-light.svg"
            anchors.centerIn: parent
            width: 40
            height: 40
        }
        MouseArea {
            anchors.fill: parent
            onClicked: thePile.push("ScanQRPage.qml")
        }
        Behavior on height { NumberAnimation { } }
    }

    Keys.onPressed: (event)=> {
        if (event.key === Qt.Key_Escape || event.key === Qt.Key_Back) {
            // when we are on another tab, we can go to 'main' on back.
            if (tabBar.currentIndex !== 0) {
                event.accepted = true
                tabBar.selectTab(0)
            }
        }
    }

    // should the app be started with the intent to open the "Planned Payment" screen,
    // we handle that here.
    Connections {
        target: intent
        function onGenericIntentChanged() { // it only ever changes at most once
            if (intent.genericIntent === Intent.OpenPlannedPaymentScreen)
                tabBar.selectTab(1)
        }
    }
}