// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: 2024 A-La-Karte Contributors

import QtQuick
import QtQuick.Controls as QQC2
import QtQuick.Layouts
import QtQuick.Effects
import org.kde.kirigami as Kirigami
import org.kde.alakarte
import "components"

FocusScope {
    id: libraryRoot

    property string filterSource: "all"
    property bool searchActive: false
    property int focusedIndex: 0

    property int adaptiveCardSize: App.config.gridSize
    property bool isTouchDevice: false

    signal gameSelected(var game)
    signal gameLaunched(var game)

    readonly property int gameCount: proxyModel.count
    property url focusedCoverUrl: ""

    function focusSearch() {
        searchField.forceActiveFocus()
    }

    function clearSearch() {
        searchField.text = ""
        proxyModel.filterText = ""
    }

    function restoreFocus() {
        if (libraryRoot.searchActive) {
            libraryRoot.focusSearch()
        } else {
            if (libraryRoot.focusedIndex >= 0 && libraryRoot.focusedIndex < proxyModel.count) {
                gameGrid.currentIndex = libraryRoot.focusedIndex
            }
            gameGrid.forceActiveFocus()
        }
    }

    function launchFocusedGame() {
        if (!gameGrid || !proxyModel) return
        let game = proxyModel.get(gameGrid.currentIndex)
        if (game) {
            libraryRoot.gameLaunched(game)
        }
    }

    function openDetailsForFocusedGame() {
        if (!gameGrid || !proxyModel) return
        let game = proxyModel.get(gameGrid.currentIndex)
        if (game) {
            libraryRoot.gameSelected(game)
        }
    }

    onSearchActiveChanged: {
        if (!libraryRoot.searchActive) {
            libraryRoot.clearSearch()
            Qt.callLater(function() {
                gameGrid.forceActiveFocus()
            })
        }
    }

    Item {
        anchors.fill: parent
        anchors.margins: 0

        Item {
            anchors.fill: parent
            visible: libraryRoot.gameCount > 0

            Image {
                id: backgroundCoverA
                anchors.fill: parent
                source: ""
                fillMode: Image.PreserveAspectCrop
                asynchronous: true
                visible: source.toString().length > 0
                smooth: true
                mipmap: App.config.highQualityImages
                opacity: 0.0

                Behavior on opacity {
                    NumberAnimation { duration: Kirigami.Units.longDuration; easing.type: Easing.InOutCubic }
                }

                layer.enabled: true
                layer.effect: MultiEffect {
                    blurEnabled: true
                    blur: 0.9
                    blurMax: 64
                }
            }

            Image {
                id: backgroundCoverB
                anchors.fill: parent
                source: ""
                fillMode: Image.PreserveAspectCrop
                asynchronous: true
                visible: source.toString().length > 0
                smooth: true
                mipmap: App.config.highQualityImages
                opacity: 0.0

                Behavior on opacity {
                    NumberAnimation { duration: Kirigami.Units.longDuration; easing.type: Easing.InOutCubic }
                }

                layer.enabled: true
                layer.effect: MultiEffect {
                    blurEnabled: true
                    blur: 0.9
                    blurMax: 64
                }
            }

            Rectangle {
                anchors.fill: parent
                color: Qt.rgba(0, 0, 0, 0.55)
            }
        }

        ColumnLayout {
            anchors.fill: parent
            spacing: Kirigami.Units.smallSpacing

        SearchHeader {
            id: searchHeader
            Layout.fillWidth: true
            visible: libraryRoot.searchActive

            searchField: searchField

            onSearchChanged: function(text) {
                proxyModel.filterText = text
            }

            onSortChanged: function(mode) {
                proxyModel.sortMode = mode
            }

            Kirigami.SearchField {
                id: searchField
                Layout.fillWidth: true
                placeholderText: i18n("Search games...")

                onTextChanged: proxyModel.filterText = text

                Keys.onEscapePressed: {
                    text = ""
                    let w = applicationWindow()
                    if (w && w.hasOwnProperty("searchActive")) {
                        w.searchActive = false
                    } else {
                        libraryRoot.searchActive = false
                    }
                    libraryRoot.restoreFocus()
                }

                Keys.onDownPressed: gameGrid.forceActiveFocus()
            }
        }

        GameGridView {
            id: gameGrid
            Layout.fillWidth: true
            Layout.fillHeight: true

            cardSize: libraryRoot.adaptiveCardSize

            onCurrentIndexChanged: {
                if (gameGrid.activeFocus) {
                    libraryRoot.focusedIndex = currentIndex
                }
                let game = proxyModel.get(currentIndex)
                let url = (game && game.coverUrl) ? game.coverUrl : ""
                if (url === libraryRoot.focusedCoverUrl) return
                if (backgroundCoverA.opacity > 0.1) {
                    backgroundCoverB.source = url
                    backgroundCoverB.opacity = 0.0
                    backgroundCoverA.opacity = 0.0
                    Qt.callLater(function() { backgroundCoverB.opacity = 0.22 })
                } else {
                    backgroundCoverA.source = url
                    backgroundCoverA.opacity = 0.0
                    backgroundCoverB.opacity = 0.0
                    Qt.callLater(function() { backgroundCoverA.opacity = 0.22 })
                }
                libraryRoot.focusedCoverUrl = url
            }

                model: GameSortFilterModel {
                    id: proxyModel
                    sourceModel: App.gameModel
                    showHidden: libraryRoot.filterSource === "hidden"
                    favoritesOnly: libraryRoot.filterSource === "favorites"
                    filterSource: {
                        if (libraryRoot.filterSource === "all") return ""
                        if (libraryRoot.filterSource === "favorites") return ""
                        if (libraryRoot.filterSource === "hidden") return ""
                        return libraryRoot.filterSource
                    }
                }

            delegate: Item {
                width: gameGrid.cellWidth
                height: gameGrid.cellHeight

                function clicked() {
                    gameGrid.currentIndex = index
                    libraryRoot.focusedIndex = index
                    card.clicked()
                }

                function play() {
                    gameGrid.currentIndex = index
                    libraryRoot.focusedIndex = index
                    card.playClicked()
                }

                GameCard {
                    id: card
                    width: gameGrid.cardSize
                    height: Math.round(gameGrid.cardSize * 1.4)
                    anchors.centerIn: parent

                    game: model.gameObject
                    focused: gameGrid.currentIndex === index && gameGrid.activeFocus

                    onClicked: libraryRoot.gameSelected(model.gameObject)
                    onDoubleClicked: libraryRoot.gameLaunched(model.gameObject)
                    onPlayClicked: libraryRoot.gameLaunched(model.gameObject)

                    Keys.onReturnPressed: libraryRoot.gameSelected(model.gameObject)
                    Keys.onEnterPressed: libraryRoot.gameSelected(model.gameObject)
                    Keys.onSpacePressed: libraryRoot.gameLaunched(model.gameObject)
                }
            }

            Keys.onPressed: function(event) {
                if (event.key === Qt.Key_Return || event.key === Qt.Key_Enter) {
                    let game = proxyModel.get(currentIndex)
                    if (game) {
                        libraryRoot.gameSelected(game)
                    }
                    event.accepted = true
                } else if (event.key === Qt.Key_Space) {
                    let game = proxyModel.get(currentIndex)
                    if (game) {
                        libraryRoot.gameLaunched(game)
                    }
                    event.accepted = true
                }
            }

            EmptyState {
                anchors.centerIn: parent
                visible: proxyModel.count === 0 && !App.importing

                icon: proxyModel.filterText.length > 0 ? "edit-find" : (libraryRoot.filterSource === "favorites" ? "bookmark-new" : (libraryRoot.filterSource === "hidden" ? "view-hidden" : "applications-games"))
                title: proxyModel.filterText.length > 0 ?
                    i18n("No games found") : (libraryRoot.filterSource === "favorites" ? i18n("No favorites yet") : (libraryRoot.filterSource === "hidden" ? i18n("No hidden games") : i18n("Your library is empty")))
                description: proxyModel.filterText.length > 0 ?
                    i18n("Try adjusting your search") : (libraryRoot.filterSource === "favorites" ? i18n("Mark games as favorites to see them here") : (libraryRoot.filterSource === "hidden" ? i18n("Hidden games will appear here") : i18n("Import games to get started")))

                actionText: (proxyModel.filterText.length > 0 || libraryRoot.filterSource === "favorites" || libraryRoot.filterSource === "hidden") ? "" : i18n("Import Games")
                onActionTriggered: App.importAllGames()
            }

            QQC2.BusyIndicator {
                anchors.centerIn: parent
                running: App.importing
                visible: App.importing
            }
        }
        }
    }
}