// The app window: chat on the left, tool runs and consent on top of it.
//
// Qt Quick Controls only, laid out the way Kirigami expects (single column,
// cards, drawer for navigation) so that swapping `import QtQuick.Controls`
// for `import org.kde.kirigami as Kirigami` and Page/Card wrappers is a QML
// change, not a rewrite.

import QtQuick
import QtQuick.Controls
import QtQuick.Layouts

ApplicationWindow {
    id: win
    width: 980
    height: 720
    visible: true
    title: "CST-agent — " + (agent.workspace.length ? agent.workspace : "no workspace")

    ListModel { id: transcript }

    header: ToolBar {
        RowLayout {
            anchors.fill: parent
            Label {
                text: agent.workspace.length ? agent.workspace : "(no workspace)"
                elide: Text.ElideMiddle
                Layout.fillWidth: true
            }
            BusyIndicator {
                running: agent.running
                visible: agent.running
                implicitWidth: 24
                implicitHeight: 24
            }
            ComboBox {
                id: modeBox
                model: ["coding", "general"]
                currentIndex: agent.mode === "general" ? 1 : 0
                onActivated: agent.setMode(model[currentIndex])
            }
        }
    }

    // ---- consent: the engine's on_permission hook waits for this ----
    Dialog {
        id: consent
        anchors.centerIn: parent
        width: Math.min(720, win.width - 40)
        modal: true
        property string tool: ""
        property string detail: ""
        property string preview: ""
        title: "Allow " + tool + "?"
        contentItem: ColumnLayout {
            Label { text: consent.detail; wrapMode: Text.Wrap; Layout.fillWidth: true }
            ScrollView {
                Layout.fillWidth: true
                Layout.preferredHeight: Math.min(300, previewText.implicitHeight + 16)
                visible: consent.preview.length > 0
                TextArea {
                    id: previewText
                    text: consent.preview
                    readOnly: true
                    font.family: "monospace"
                    wrapMode: TextArea.NoWrap
                }
            }
        }
        footer: DialogButtonBox {
            Button { text: "Deny"; DialogButtonBox.buttonRole: DialogButtonBox.RejectRole }
            Button { text: "Once"; DialogButtonBox.buttonRole: DialogButtonBox.AcceptRole }
            Button { text: "Always"; DialogButtonBox.buttonRole: DialogButtonBox.ActionRole }
            onRejected: { agent.answerPermission(0); consent.close() }
            onAccepted: { agent.answerPermission(1); consent.close() }
            onClicked: function (button) {
                if (button.text === "Always") { agent.answerPermission(2); consent.close() }
            }
        }
    }

    // ---- ask_user ----
    Dialog {
        id: question
        anchors.centerIn: parent
        width: Math.min(600, win.width - 40)
        modal: true
        property string text: ""
        property string options: ""
        title: "The agent asks"
        contentItem: ColumnLayout {
            Label { text: question.text; wrapMode: Text.Wrap; Layout.fillWidth: true }
            Label {
                visible: question.options.length > 0
                text: question.options
                wrapMode: Text.Wrap
                Layout.fillWidth: true
                opacity: 0.7
            }
            TextField { id: answerField; Layout.fillWidth: true; placeholderText: "your answer" }
        }
        footer: DialogButtonBox {
            Button { text: "Send"; DialogButtonBox.buttonRole: DialogButtonBox.AcceptRole }
            onAccepted: { agent.answerQuestion(answerField.text); question.close() }
        }
    }

    ColumnLayout {
        anchors.fill: parent
        anchors.margins: 12
        spacing: 8

        ListView {
            id: chat
            Layout.fillWidth: true
            Layout.fillHeight: true
            model: transcript
            clip: true
            spacing: 8
            delegate: Frame {
                width: chat.width
                background: Rectangle {
                    color: model.role === "user" ? "#2b579a22" : "#00000000"
                    border.color: "#88888833"
                    radius: 6
                }
                ColumnLayout {
                    width: parent.width
                    spacing: 2
                    Label {
                        text: model.role === "user" ? "You" : "Agent"
                        font.bold: true
                        opacity: 0.7
                    }
                    TextEdit {
                        text: model.text
                        readOnly: true
                        wrapMode: TextEdit.Wrap
                        selectByMouse: true
                        Layout.fillWidth: true
                    }
                }
            }
            onCountChanged: positionViewAtEnd()
        }

        RowLayout {
            Layout.fillWidth: true
            TextArea {
                id: composer
                Layout.fillWidth: true
                Layout.preferredHeight: 90
                placeholderText: agent.running ? "… working (Esc cancels)"
                                               : "Ask something (Enter sends, Shift+Enter for a new line)"
                wrapMode: TextArea.Wrap
                enabled: !agent.running
                Keys.onPressed: function (ev) {
                    if (ev.key === Qt.Key_Return && !(ev.modifiers & Qt.ShiftModifier)) {
                        sendButton.clicked()
                        ev.accepted = true
                    }
                }
            }
            ColumnLayout {
                Button {
                    id: sendButton
                    text: "Send"
                    enabled: !agent.running && composer.text.trim().length > 0
                    onClicked: {
                        transcript.append({ role: "user", text: composer.text })
                        transcript.append({ role: "agent", text: "" })
                        agent.send(composer.text)
                        composer.text = ""
                    }
                }
                Button {
                    text: "Stop"
                    enabled: agent.running
                    onClicked: agent.cancel()
                }
            }
        }
    }

    Shortcut { sequence: "Escape"; onActivated: agent.cancel() }

    // ---- engine -> UI ----
    function appendToAgent(text) {
        if (transcript.count === 0)
            transcript.append({ role: "agent", text: "" })
        const last = transcript.count - 1
        transcript.setProperty(last, "text", transcript.get(last).text + text)
    }

    Connections {
        target: agent
        function onAssistantDelta(text) { appendToAgent(text) }
        function onStatusChanged(text) {
            transcript.append({ role: "agent", text: "· " + text })
        }
        function onToolEvent(phase, name, detail) {
            transcript.append({
                role: "agent",
                text: "[" + name + " " + phase + (detail.length ? ": " + detail : "") + "]"
            })
        }
        function onToolResult(name, exitCode, output) {
            transcript.append({
                role: "agent",
                text: "[" + name + " exit=" + exitCode + "]\n" + output
            })
        }
        function onPermissionRequested(tool, detail, preview) {
            consent.tool = tool
            consent.detail = detail
            consent.preview = preview
            consent.open()
        }
        function onQuestionAsked(text, options) {
            question.text = text
            question.options = options
            answerField.text = ""
            question.open()
        }
        function onTurnFinished(rc, err) {
            if (err.length)
                transcript.append({ role: "agent", text: "error: " + err })
        }
    }
}