// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
//
// The login card: avatar, username, password, session choice, feedback and the
// power bar. Reads the palette straight from `config`; SDDM merges theme.conf
// and the live theme.conf.user into it.

import QtQuick
import QtQuick.Controls.Basic
import QtQuick.Effects

Item {
    id: card

    // The wallpaper image to frost behind the card. Null falls back to a flat
    // translucent surface.
    property Item backdropSource: null
    readonly property int radius: 10
    signal wake()

    // Shake on a failed login without touching the card's own x binding, which
    // Main owns: animating x directly would destroy that binding.
    property real shakeOffset: 0

    implicitWidth: 380
    implicitHeight: column.implicitHeight + 2 * 28

    // Flat translucent surface. Task 4 layers the blur behind it.
    Rectangle {
        anchors.fill: parent
        radius: card.radius
        color: config.stringValue("mantle")
        opacity: 0.82
    }

    Rectangle {
        anchors.fill: parent
        radius: card.radius
        color: "transparent"
        border.width: 2
        border.color: config.stringValue("accent")
    }

    // Avatar lookup. userModel is a list model; Repeater delegates expose its
    // roles by name. The matching face is copied out on demand because the
    // username can change.
    property string avatarPath: ""
    readonly property string initials:
        usernameField.text.length > 0 ? usernameField.text.charAt(0).toUpperCase() : "?"

    Repeater {
        id: faces
        model: userModel
        delegate: Item {
            readonly property string faceName: name
            readonly property string faceIcon: icon
            visible: false
        }
    }

    function refreshAvatar() {
        for (var i = 0; i < faces.count; ++i) {
            var it = faces.itemAt(i)
            if (it && it.faceName === usernameField.text) {
                avatarPath = it.faceIcon || ""
                return
            }
        }
        avatarPath = ""
    }

    Column {
        id: column
        anchors.centerIn: parent
        width: parent.width - 2 * 28
        spacing: 16

        Item {
            width: 96
            height: 96
            anchors.horizontalCenter: parent.horizontalCenter

            Rectangle {
                anchors.fill: parent
                radius: width / 2
                color: config.stringValue("surface0")
                visible: avatarImage.status !== Image.Ready
                Text {
                    anchors.centerIn: parent
                    text: card.initials
                    color: config.stringValue("text")
                    font.family: "Noto Sans"
                    font.pixelSize: 34
                }
            }

            Image {
                id: avatarImage
                anchors.fill: parent
                source: card.avatarPath
                fillMode: Image.PreserveAspectCrop
                visible: false
            }

            MultiEffect {
                anchors.fill: parent
                source: avatarImage
                visible: avatarImage.status === Image.Ready
                maskEnabled: true
                maskSource: avatarMask
            }

            Rectangle {
                id: avatarMask
                anchors.fill: parent
                radius: width / 2
                layer.enabled: true
                visible: false
            }

            Rectangle {
                anchors.fill: parent
                radius: width / 2
                color: "transparent"
                border.width: 2
                border.color: config.stringValue("accent")
            }
        }

        TextField {
            id: usernameField
            width: parent.width
            text: userModel.lastUser !== undefined ? userModel.lastUser : ""
            placeholderText: "Username"
            font.family: "Noto Sans"
            color: config.stringValue("text")
            palette.base: config.stringValue("surface0")
            palette.text: config.stringValue("text")
            palette.highlight: config.stringValue("accent")
            palette.highlightedText: config.stringValue("base")
            background: Rectangle {
                radius: 6
                color: config.stringValue("surface0")
            }
            onTextChanged: card.refreshAvatar()
            onAccepted: card.login()
            Keys.onPressed: event => {
                card.wake()
                event.accepted = false
            }
        }

        TextField {
            id: passwordField
            width: parent.width
            echoMode: TextInput.Password
            placeholderText: "Password"
            font.family: "Noto Sans"
            color: config.stringValue("text")
            palette.base: config.stringValue("surface0")
            palette.text: config.stringValue("text")
            palette.highlight: config.stringValue("accent")
            palette.highlightedText: config.stringValue("base")
            background: Rectangle {
                radius: 6
                color: config.stringValue("surface0")
            }
            onAccepted: card.login()
            Keys.onPressed: event => {
                card.wake()
                event.accepted = false
            }
        }

        Row {
            width: parent.width
            spacing: 8

            ComboBox {
                id: sessionBox
                width: parent.width - loginButton.width - parent.spacing
                model: sessionModel
                textRole: "name"
                currentIndex: sessionModel.lastIndex
                font.family: "Noto Sans"
                palette.base: config.stringValue("surface0")
                palette.text: config.stringValue("text")
                palette.highlight: config.stringValue("accent")
                palette.highlightedText: config.stringValue("base")
                background: Rectangle {
                    radius: 6
                    color: config.stringValue("surface0")
                }
            }

            Button {
                id: loginButton
                text: "Log in"
                font.family: "Noto Sans"
                palette.button: config.stringValue("accent")
                palette.buttonText: config.stringValue("base")
                background: Rectangle {
                    radius: 6
                    color: config.stringValue("accent")
                }
                contentItem: Text {
                    text: loginButton.text
                    color: config.stringValue("base")
                    font: loginButton.font
                    horizontalAlignment: Text.AlignHCenter
                    verticalAlignment: Text.AlignVCenter
                    padding: 8
                }
                onClicked: card.login()
            }
        }

        Text {
            width: parent.width
            horizontalAlignment: Text.AlignHCenter
            wrapMode: Text.WordWrap
            font.family: "Noto Sans"
            font.pixelSize: 12
            color: card.loginError !== ""
                ? config.stringValue("red")
                : config.stringValue("yellow")
            text: card.message
        }
    }

    function login() {
        if (usernameField.text.length === 0)
            return
        sddm.login(usernameField.text, passwordField.text, sessionBox.currentIndex)
    }

    // Login failure wins the notice line; otherwise Caps Lock, if on.
    property string loginError: ""
    readonly property string message: {
        if (loginError !== "")
            return loginError
        if (keyboard.capsLock)
            return "Caps Lock is on"
        return ""
    }

    Connections {
        target: sddm
        function onLoginFailed() {
            loginError = "Login failed"
            passwordField.text = ""
            shake.restart()
        }
        function onLoginSucceeded() {
            loginError = ""
        }
    }

    SequentialAnimation {
        id: shake
        NumberAnimation { target: card; property: "shakeOffset"; to: -10; duration: 40 }
        NumberAnimation { target: card; property: "shakeOffset"; to: 10; duration: 40 }
        NumberAnimation { target: card; property: "shakeOffset"; to: 0; duration: 40 }
    }

    Component.onCompleted: {
        refreshAvatar()
        usernameField.forceActiveFocus()
    }
}