/**
 *
 * gPodder QML UI Reference Implementation
 * Copyright (c) 2013, Thomas Perl <m@thp.io>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 *
 */

import QtQuick 2.0
import 'common'

import 'common/constants.js' as Constants
import 'icons/icons.js' as Icons

Item {
    id: pgst

    GPodderCore { id: py }
    GPodderPlayback { id: player }

    GPodderPodcastListModel { id: podcastListModel }

    property real scalef: (width < height) ? (width / 480) : (height / 480)
    property int shorterSide: (width < height) ? width : height
    property int dialogsVisible: 0

    anchors.fill: parent

    function update(page, x) {
        var index = -1;
        for (var i=0; i<children.length; i++) {
            if (children[i] === page) {
                index = i;
                break;
            }
        }

        if (page.isDialog) {
            children[index-1].opacity = 1;
        } else {
            children[index-1].opacity = x / width;
        }

        //children[index-1].pushPhase = x / width;
    }

    property bool loadPageInProgress: false
    property bool hasBackButton: false
    property int bottomSpacing: toolbar.showing ? toolbar.height+toolbar.anchors.bottomMargin : 0

    property bool hasMenuButton: false
    property string menuButtonLabel: ''
    property string menuButtonIcon: ''

    function topOfStackChanged(offset) {
        if (offset === undefined) {
            offset = 0;
        }

        var page = children[children.length+offset-1];

        // TODO: Maybe make these property bindings instead
        pgst.hasBackButton = (!page.isDialog && page.canClose);
        pgst.hasMenuButton = page.hasMenuButton;
        if (pgst.hasMenuButton) {
            pgst.menuButtonLabel = page.menuButtonLabel;
            pgst.menuButtonIcon = page.menuButtonIcon;
        } else {
            pgst.menuButtonLabel = 'Menu';
            pgst.menuButtonIcon = Icons.vellipsis;
        }
    }

    function showConfirmation(title, affirmative, negative, description, icon, callback) {
        loadPage('Confirmation.qml', {
            title: title,
            affirmativeAction: affirmative,
            negativeAction: negative,
            description: description,
            icon: icon,
            callback: callback,
        });
    }

    function showSelection(items, title, selectedIndex) {
        loadPage('SelectionDialog.qml', {
            title: title,
            callback: function (index, item) {
                items[index].callback();
            },
            items: function() {
                var result = [];
                for (var i in items) {
                    result.push(items[i].label);
                }
                return result;
            }(),
            selectedIndex: selectedIndex,
        });
    }

    function loadPage(filename, properties) {
        if (pgst.loadPageInProgress) {
            console.log('ignoring loadPage request while load in progress');
            return;
        }

        var component = Qt.createComponent(filename);
        if (component.status != Component.Ready) {
            console.log('Error loading ' + filename + ':' +
                component.errorString());
        }

        if (properties === undefined) {
            properties = {};
        }

        pgst.loadPageInProgress = true;
        component.createObject(pgst, properties);
    }

    PBusyIndicator {
        anchors.centerIn: parent
        visible: !py.ready
    }

    Image {
        z: 101
        anchors {
            left: parent.left
            right: parent.right
            bottom: toolbar.top
        }

        source: 'images/toolbarshadow.png'
        opacity: .1
        height: 10 * pgst.scalef
        visible: toolbar.showing
    }

    PToolbar {
        id: toolbar
        z: 102

        Row {
            anchors {
                verticalCenter: parent.verticalCenter
                left: parent.left
            }

            PToolbarButton {
                id: backButton

                text: 'Back'
                icon: Icons.arrow_left

                enabled: pgst.hasBackButton
                onClicked: pgst.children[pgst.children.length-1].closePage();
            }
        }

        Row {
            anchors {
                verticalCenter: parent.verticalCenter
                right: parent.right
            }

            PToolbarButton {
                id: throbber

                text: 'Now Playing'
                icon: Icons.play

                enabled: player.episode != 0
                onClicked: loadPage('PlayerPage.qml');
            }

            PToolbarButton {
                id: menuButton

                text: pgst.menuButtonLabel
                icon: pgst.menuButtonIcon

                enabled: pgst.hasMenuButton
                onClicked: pgst.children[pgst.children.length-1].menuButtonClicked()
            }
        }
    }

    PodcastsPage {
        visible: py.ready
    }
}