// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

import Qt.labs.folderlistmodel
import QtQuick
import QtQuick.Controls
import QtQuick.Controls.impl
import QtQuick.Dialogs
import QtQuick.Dialogs.quickimpl
import QtQuick.Layouts
import QtQuick.Templates as T

import "." as DialogsImpl

FileDialogImpl {
    id: control

    implicitWidth: Math.max(implicitBackgroundWidth + leftInset + rightInset,
                            contentWidth + leftPadding + rightPadding,
                            implicitHeaderWidth,
                            implicitFooterWidth)
    implicitHeight: Math.max(implicitBackgroundHeight + topInset + bottomInset,
                             contentHeight + topPadding + bottomPadding
                             + (implicitHeaderHeight > 0 ? implicitHeaderHeight + spacing : 0)
                             + (implicitFooterHeight > 0 ? implicitFooterHeight + spacing : 0))

    leftPadding: 20
    rightPadding: 20
    // Ensure that the background's border is visible.
    leftInset: -1
    rightInset: -1
    topInset: -1
    bottomInset: -1

    standardButtons: T.Dialog.Open | T.Dialog.Cancel

    Dialog {
        id: overwriteConfirmationDialog
        objectName: "confirmationDialog"
        anchors.centerIn: parent
        closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutsideParent
        dim: true
        modal: true
        title: qsTr("Overwrite file?")
        width: control.width - control.leftPadding - control.rightPadding

        contentItem: Label {
            text: qsTr("“%1” already exists.\nDo you want to replace it?").arg(control.fileName)
            wrapMode: Text.WordWrap
        }

        footer: DialogButtonBox {
            alignment: Qt.AlignHCenter
            standardButtons: DialogButtonBox.Yes | DialogButtonBox.No
        }
    }

    /*
        We use attached properties because we want to handle logic in C++, and:
        - We can't assume the footer only contains a DialogButtonBox (which would allow us
          to connect up to it in QQuickFileDialogImpl); it also needs to hold a ComboBox
          and therefore the root footer item will be e.g. a layout item instead.
        - We don't want to create our own "FileDialogButtonBox" (in order to be able to handle the logic
          in C++) because we'd need to copy (and hence duplicate code in) DialogButtonBox.qml.
    */
    FileDialogImpl.buttonBox: buttonBox
    FileDialogImpl.nameFiltersComboBox: nameFiltersComboBox
    FileDialogImpl.fileDialogListView: fileDialogListView
    FileDialogImpl.breadcrumbBar: breadcrumbBar
    FileDialogImpl.fileNameLabel: fileNameLabel
    FileDialogImpl.fileNameTextField: fileNameTextField
    FileDialogImpl.overwriteConfirmationDialog: overwriteConfirmationDialog

    background: Rectangle {
        implicitWidth: 600
        implicitHeight: 400
        color: control.palette.window
        border.color: control.palette.dark
    }

    header: Pane {
        palette.window: control.palette.light
        padding: 20

        contentItem: Column {
            spacing: 12

            Label {
                objectName: "dialogTitleBarLabel"
                width: parent.width
                text: control.title
                visible: parent.parent.parent?.parent === Overlay.overlay && control.title.length > 0
                horizontalAlignment: Label.AlignHCenter
                elide: Label.ElideRight
                font.bold: true
            }

            DialogsImpl.FolderBreadcrumbBar {
                id: breadcrumbBar
                width: parent.width
                dialog: control

                KeyNavigation.tab: fileDialogListView
            }
        }
    }

    contentItem: ListView {
        id: fileDialogListView
        objectName: "fileDialogListView"
        clip: true
        focus: true
        boundsBehavior: Flickable.StopAtBounds

        ScrollBar.vertical: ScrollBar {}

        model: FolderListModel {
            folder: control.currentFolder
            nameFilters: control.selectedNameFilter.globs
            showDirsFirst: PlatformTheme.themeHint(PlatformTheme.ShowDirectoriesFirst)
            sortCaseSensitive: false
        }
        delegate: DialogsImpl.FileDialogDelegate {
            objectName: "fileDialogDelegate" + index
            width: ListView.view.width
            highlighted: ListView.isCurrentItem
            dialog: control
            fileDetailRowWidth: nameFiltersComboBox.width

            KeyNavigation.backtab: breadcrumbBar
            KeyNavigation.tab: fileNameTextField.visible ? fileNameTextField : nameFiltersComboBox
        }
    }

    footer: Rectangle {
        color: control.palette.light
        implicitWidth: gridLayout.implicitWidth
        implicitHeight: gridLayout.implicitHeight + 12

        GridLayout {
            // OK to use IDs here, since users shouldn't be overriding this stuff.
            id: gridLayout
            anchors.fill: parent
            anchors.topMargin: 6
            anchors.bottomMargin: 6
            columnSpacing: 20
            columns: 3

            Label {
                id: fileNameLabel
                text: qsTr("File name")
                visible: false

                Layout.leftMargin: 20
            }

            TextField {
                id: fileNameTextField
                objectName: "fileNameTextField"
                visible: false

                Layout.fillWidth: true
            }

            Label {
                text: qsTr("Filter")

                Layout.row: 1
                Layout.column: 0
                Layout.leftMargin: 20
            }

            ComboBox {
                id: nameFiltersComboBox
                model: control.nameFilters
                verticalPadding: 0

                Layout.fillWidth: true
            }

            DialogButtonBox {
                id: buttonBox
                standardButtons: control.standardButtons
                palette.window: control.palette.light
                spacing: 12
                padding: 0

                Layout.row: 1
                Layout.column: 2
                Layout.rightMargin: 20
            }
        }
    }

    Overlay.modal: Rectangle {
        color: Color.transparent(control.palette.shadow, 0.5)
    }

    Overlay.modeless: Rectangle {
        color: Color.transparent(control.palette.shadow, 0.12)
    }
}
