import QtQuick 2.2
import Sailfish.Silica 1.0
import "../js/henflow.js" as HF
import "../js/i18n.js" as I18N
import "../js/catalog.js" as Catalog

// Scheda ordine: nuovo ordine o modifica di uno esistente.
// Porting di AddReservationSheet + _calculateDeliveryDate: la data di consegna
// viene calcolata dalla coda FIFO e mostrata in anteprima mentre si digita.
Page {
    id: page
    allowedOrientations: Orientation.All

    property var reservation: null       // null = nuovo ordine
    property var onSaved: null           // callback della pagina chiamante (ricarica la Home)
    property var breeds: []
    property var choices: []             // razze attive con galline in deposizione
    property int selected: -1
    property string lang: "en"
    property string errorMsg: ""

    function tr(key, arg) { return I18N.t(key, arg, page.lang) }

    function load() {
        page.lang = I18N.langFor(appSettings.language, Qt.locale().name)
        page.breeds = appData.breedSettings()

        var list = []
        for (var i = 0; i < page.breeds.length; i++) {
            if (HF.activeHens(page.breeds[i]) > 0)
                list.push(page.breeds[i].breedId)
        }
        page.choices = list

        if (page.reservation) {
            customerField.text = page.reservation.customerName
            eggsField.text = String(page.reservation.eggsRequested)
            for (var j = 0; j < list.length; j++) {
                if (list[j] === page.reservation.breedId)
                    page.selected = j
            }
        }
        if (page.selected < 0 && list.length > 0)
            page.selected = 0

        page.updatePreview()
    }

    // Data prevista: parte dalle scorte e dalla coda corrente (_calculateDeliveryDate).
    function updatePreview() {
        if (page.selected < 0) {
            previewLabel.text = page.tr("config_breed_first")
            return
        }
        var eggs = parseInt(eggsField.text)
        if (!eggs || eggs <= 0)
            eggs = 0

        var breedId = page.choices[page.selected]
        var today = HF.todayMidnight()
        var delivery = HF.estimateDeliveryDate(appData.reservations(),
                                               appData.warehouseStock(),
                                               page.breeds, Catalog.HF_BREEDS,
                                               breedId, eggs, today)
        var days = HF.dayDiff(today, HF.parseIso(delivery))
        var when
        if (days <= 0) when = page.tr("today")
        else if (days === 1) when = page.tr("in_day")
        else when = page.tr("in_days", days)

        previewLabel.text = HF.formatDay(delivery) + "  (" + when + ")"
    }

    function save() {
        if (page.selected < 0) {
            page.errorMsg = page.tr("config_breed_first")
            return
        }
        var name = customerField.text.trim()
        if (name.length === 0) {
            page.errorMsg = page.tr("customer_name")
            return
        }
        var eggs = parseInt(eggsField.text)
        if (!eggs || eggs <= 0) {
            page.errorMsg = page.tr("eggs_req")
            return
        }

        var breedId = page.choices[page.selected]
        var list = appData.reservations()
        var today = HF.todayMidnight()
        var delivery = HF.estimateDeliveryDate(list, appData.warehouseStock(),
                                               page.breeds, Catalog.HF_BREEDS,
                                               breedId, eggs, today)

        if (page.reservation) {
            for (var i = 0; i < list.length; i++) {
                if (list[i].id === page.reservation.id) {
                    list[i].customerName = name
                    list[i].breedId = breedId
                    list[i].eggsRequested = eggs
                    list[i].deliveryDate = delivery
                    break
                }
            }
        } else {
            list.push({
                "id": HF.newId(),
                "customerName": name,
                "breedId": breedId,
                "eggsRequested": eggs,
                "createdAt": HF.nowIso(),
                "deliveryDate": delivery,
                "isDelivered": false
            })
        }
        appData.saveReservations(list)
        if (page.onSaved)
            page.onSaved()
        pageStack.pop()
    }

    SilicaFlickable {
        anchors.fill: parent
        contentHeight: formColumn.height

        Column {
            id: formColumn
            width: parent.width

            PageHeader {
                title: page.reservation ? page.tr("edit_order") : page.tr("new_order")
            }

            TextField {
                id: customerField
                anchors.left: parent.left
                anchors.right: parent.right
                label: page.tr("customer_name")
                placeholderText: page.tr("customer_name")
                inputMethodHints: Qt.ImhNoPredictiveText
                onTextChanged: page.errorMsg = ""
            }

            // suggerimenti dai clienti registrati
            Repeater {
                model: {
                    var out = []
                    var q = customerField.text.toLowerCase()
                    if (q.length < 2)
                        return 0
                    var customers = appData.customers()
                    for (var i = 0; i < customers.length && out.length < 3; i++) {
                        var full = (customers[i].firstName + " " + customers[i].lastName).trim()
                        if (full.toLowerCase().indexOf(q) === 0)
                            out.push(full)
                    }
                    return out.length
                }

                delegate: BackgroundItem {
                    width: formColumn.width
                    height: Theme.itemSizeSmall

                    Label {
                        x: Theme.horizontalPageMargin
                        anchors.verticalCenter: parent.verticalCenter
                        width: parent.width - 2 * Theme.horizontalPageMargin
                        truncationMode: TruncationMode.Fade
                        color: parent.highlighted ? Theme.highlightColor : Theme.secondaryColor
                        text: page.suggestions(index)
                    }

                    onClicked: {
                        customerField.text = page.suggestions(index)
                        page.errorMsg = ""
                    }
                }
            }

            Label {
                x: Theme.horizontalPageMargin
                width: parent.width - 2 * Theme.horizontalPageMargin
                text: page.tr("breed")
                font.pixelSize: Theme.fontSizeExtraSmall
                color: Theme.secondaryColor
            }

            Repeater {
                model: page.choices.length

                delegate: BackgroundItem {
                    id: breedRow
                    width: formColumn.width
                    height: Theme.itemSizeSmall

                    Label {
                        x: Theme.horizontalPageMargin
                        anchors.verticalCenter: parent.verticalCenter
                        width: parent.width - 2 * Theme.horizontalPageMargin
                        truncationMode: TruncationMode.Fade
                        color: (index === page.selected)
                               ? Theme.highlightColor
                               : (breedRow.highlighted ? Theme.highlightColor : Theme.primaryColor)
                        text: page.breedLabel(page.choices[index])
                              + " · " + page.tr("in_laying") + ": "
                              + HF.activeHens(page.breedIndex(page.choices[index]))
                    }

                    onClicked: {
                        page.selected = index
                        page.updatePreview()
                    }
                }
            }

            Label {
                x: Theme.horizontalPageMargin
                width: parent.width - 2 * Theme.horizontalPageMargin
                visible: page.choices.length === 0
                wrapMode: Text.WordWrap
                text: page.tr("config_breed_first")
                font.pixelSize: Theme.fontSizeExtraSmall
                color: Theme.errorColor
            }

            TextField {
                id: eggsField
                anchors.left: parent.left
                anchors.right: parent.right
                label: page.tr("eggs_req")
                inputMethodHints: Qt.ImhDigitsOnly
                validator: IntValidator { bottom: 1; top: 9999 }
                onTextChanged: {
                    page.errorMsg = ""
                    page.updatePreview()
                }
            }

            Label {
                x: Theme.horizontalPageMargin
                width: parent.width - 2 * Theme.horizontalPageMargin
                text: page.tr("delivery_preview")
                font.pixelSize: Theme.fontSizeExtraSmall
                color: Theme.secondaryColor
            }

            Label {
                id: previewLabel
                x: Theme.horizontalPageMargin
                width: parent.width - 2 * Theme.horizontalPageMargin
                font.pixelSize: Theme.fontSizeLarge
                color: Theme.highlightColor
            }

            Label {
                x: Theme.horizontalPageMargin
                width: parent.width - 2 * Theme.horizontalPageMargin
                visible: page.errorMsg.length > 0
                text: page.errorMsg
                wrapMode: Text.WordWrap
                font.pixelSize: Theme.fontSizeExtraSmall
                color: Theme.errorColor
            }

            Button {
                anchors.horizontalCenter: parent.horizontalCenter
                text: page.tr("save_order")
                onClicked: page.save()
            }
        }
    }

    function breedLabel(breedId) {
        var c = Catalog.breedFromId(breedId)
        return c ? page.tr(c.name) : breedId
    }

    function breedIndex(breedId) {
        for (var i = 0; i < page.breeds.length; i++) {
            if (page.breeds[i].breedId === breedId)
                return i
        }
        return -1
    }

    function suggestions(index) {
        var out = []
        var q = customerField.text.toLowerCase()
        var customers = appData.customers()
        for (var i = 0; i < customers.length && out.length < 3; i++) {
            var full = (customers[i].firstName + " " + customers[i].lastName).trim()
            if (full.toLowerCase().indexOf(q) === 0)
                out.push(full)
        }
        return out[index]
    }

    Component.onCompleted: page.load()
}