import QtQuick 2.2
import Sailfish.Silica 1.0
import "../components"

// Dati: calore prodotto, elettricita' usata, efficienza (COP) e risparmi, come
// la scheda "Dati" dell'app ufficiale. Sono numeri che Aira calcola nel cloud:
// il bridge li legge in sola lettura e li tiene in cache per 10 minuti.
Page {
    id: page

    allowedOrientations: Orientation.All

    // La pagina non ha solo la lettura: mostra anche cosa sta facendo.
    property bool loading: false
    property string error: ""

    function stats() {
        return api.stats
    }

    function mese() {
        return page.stats()["month"] || {}
    }

    function risparmi() {
        return page.stats()["savings"] || {}
    }

    function tariffa() {
        return page.stats()["smart_tariff"] || {}
    }

    function valuta() {
        return page.stats()["currency"] || "EUR"
    }

    function kwh(valore) {
        if (valore === undefined || valore === null)
            return "—"
        return api.formatValue(valore) + " kWh"
    }

    // Il COP ha due decimali, la temperatura uno: per questo non basta fmt().
    function cop(valore) {
        if (valore === undefined || valore === null)
            return qsTr("no data")
        return api.formatNumber(valore, 2)
    }

    function soldi(valore) {
        if (valore === undefined || valore === null)
            return "—"
        return api.formatMoney(valore, page.valuta())
    }

    function meseNome(chiave) {
        return api.monthLabel(chiave)
    }

    Connections {
        target: api
        onStatsChanged: {
            page.error = ""
            page.loading = false
        }
        onStatsRefreshed: {
            page.loading = false
            if (!ok)
                page.error = message
        }
        onErrorOccurred: page.error = message
    }

    SilicaFlickable {
        anchors.fill: parent
        contentHeight: col.height + Theme.paddingLarge

        PullDownMenu {
            MenuItem {
                text: qsTr("Refresh")
                onClicked: {
                    page.loading = true
                    api.refreshStats()
                }
            }
            MenuItem {
                text: qsTr("Plant")
                onClicked: pageStack.push(Qt.resolvedUrl("PlantPage.qml"))
            }
            MenuItem {
                text: qsTr("Settings")
                onClicked: pageStack.push(Qt.resolvedUrl("SettingsPage.qml"))
            }
        }

        Column {
            id: col
            width: parent.width
            spacing: Theme.paddingSmall

            PageHeader { title: qsTr("Data") }

            Label {
                x: Theme.horizontalPageMargin
                width: parent.width - 2 * Theme.horizontalPageMargin
                text: qsTr("Numbers calculated by Aira in the cloud: the app only reads them from your own bridge.")
                color: Theme.secondaryColor
                font.pixelSize: Theme.fontSizeExtraSmall
                wrapMode: Text.Wrap
            }

            // Gli errori non si mostrano piu' qui dentro: il messaggio arriva
            // ancorato in fondo alla pagina (NoticeBar), dove si vede sempre.

            Label {
                visible: Object.keys(page.stats()).length === 0 && page.error.length === 0
                x: Theme.horizontalPageMargin
                width: parent.width - 2 * Theme.horizontalPageMargin
                text: qsTr("Reading the data...")
                color: Theme.secondaryColor
                font.pixelSize: Theme.fontSizeSmall
                wrapMode: Text.Wrap
            }

            // ---- energia e efficienza del mese ----------------------------- //
            SectionHeader {
                visible: Object.keys(page.stats()).length > 0
                text: page.mese()["label"]
                      ? qsTr("Month of %1").arg(page.meseNome(page.mese()["label"]))
                      : qsTr("This month")
            }

            ValueRow {
                visible: Object.keys(page.stats()).length > 0
                title: qsTr("Heat produced")
                subtitle: qsTr("What the heat pump gave the house")
                value: page.kwh(page.mese()["heat_kwh"])
            }

            ValueRow {
                visible: Object.keys(page.stats()).length > 0
                title: qsTr("Electricity used")
                subtitle: qsTr("What the heat pump took from the grid")
                value: page.kwh(page.mese()["energy_kwh"])
            }

            InfoRow {
                visible: Object.keys(page.stats()).length > 0
                label: qsTr("Efficiency, domestic hot water")
                value: page.cop(page.mese()["cop_dhw"])
            }

            InfoRow {
                visible: Object.keys(page.stats()).length > 0
                label: qsTr("Efficiency, heating")
                value: page.cop(page.mese()["cop_heating"])
            }

            Label {
                visible: Object.keys(page.stats()).length > 0
                x: Theme.horizontalPageMargin
                width: parent.width - 2 * Theme.horizontalPageMargin
                text: qsTr("Efficiency (COP) is how much heat the pump delivers for each unit of electricity: higher is better.")
                color: Theme.secondaryColor
                font.pixelSize: Theme.fontSizeExtraSmall
                wrapMode: Text.Wrap
            }

            // ---- risparmi --------------------------------------------------- //
            SectionHeader {
                visible: Object.keys(page.risparmi()).length > 0
                text: qsTr("Your savings, last %1 days").arg(page.stats()["period_days"] || 30)
            }

            ValueRow {
                visible: Object.keys(page.risparmi()).length > 0
                title: qsTr("Saved on the bill")
                subtitle: qsTr("Compared with a gas boiler")
                value: page.soldi(page.risparmi()["amount"])
                valueColor: Theme.highlightColor
            }

            ValueRow {
                visible: Object.keys(page.risparmi()).length > 0
                title: qsTr("CO₂ avoided")
                subtitle: qsTr("Not released into the air")
                value: api.formatValue(page.risparmi()["co2_kg"]) + " kg"
            }

            ValueRow {
                visible: Object.keys(page.tariffa()).length > 0
                title: qsTr("Smart Tariff Control")
                subtitle: qsTr("Saving from heating when energy is cheaper")
                value: page.soldi(page.tariffa()["amount"])
                valueColor: Theme.highlightColor
            }

            // ---- dettaglio mese per mese ------------------------------------ //
            SectionHeader {
                visible: page.stats()["cop_monthly"] && page.stats()["cop_monthly"].length > 0
                text: qsTr("Efficiency month by month")
            }

            Repeater {
                model: page.stats()["cop_monthly"] || []

                InfoRow {
                    label: page.meseNome(modelData["month"])
                    value: page.cop(modelData["dhw_cop"])
                }
            }

            SectionHeader {
                visible: page.stats()["monthly_savings"] && page.stats()["monthly_savings"].length > 0
                text: qsTr("Savings month by month")
            }

            Repeater {
                model: page.stats()["monthly_savings"] || []

                InfoRow {
                    label: page.meseNome(modelData["month"])
                    value: page.soldi(modelData["amount"])
                }
            }

            BusyIndicator {
                visible: page.loading
                anchors.horizontalCenter: parent.horizontalCenter
                size: BusyIndicatorSize.Small
                running: true
            }

            Item { width: 1; height: Theme.paddingMedium }
        }
    }

    NoticeBar { }

    Component.onCompleted: {
        if (api.configured) {
            page.loading = true
            api.refreshStats()
        }
    }
}