pragma ComponentBehavior: Bound

import QtQuick
import QtQuick.Layouts
import ZShell.Config
import ZShell.Components
import ZShell.Llm
import ZShell.Blobs
import qs.Modules.Notifications.Sidebar.Chat
import qs.Components
import qs.Services

Item {
	id: root

	required property Item rootParent
	required property Item fabRoot

	property bool open: false

	property int maxHeight: root.rootParent.height - Tokens.padding.medium * 2
	property int openHeight: Math.min(modelsContent.item?.implicitHeight, maxHeight)
	property int openWidth: root.rootParent.width - Tokens.padding.medium * 2
	property real openHeightProg: openHeight / maxHeight
	property int collapsedY: 0

	property int horizontalContentMargin
	property string header: qsTr("Available models")
	property string acceptLabel: qsTr("Accept")

	z: open || dialogTransition.running ? 2 : 0
	Layout.fillWidth: true

	implicitHeight: fabRoot.implicitHeight

	function prettyModelName(): string {
		if (modelsContent.item?.modelsList.count < 1)
			return qsTr("No models found");

		const pathList = LlmClient.model.split("\/");
		const name = pathList[pathList.length - 1];

		if (!name)
			return qsTr("No model selected");

		return name;
	}

	Behavior on implicitHeight {
		Anim {}
	}

	function reparentWrapper(): void {
		const newParent = open ? root.rootParent : root;
		const c = modelsWrapper.parent.mapToItem(newParent, modelsWrapper.x + modelsWrapper.width / 2, modelsWrapper.y + modelsWrapper.height / 2);
		root.collapsedY = modelsWrapper.y;
		modelsWrapper.parent = newParent;
		modelsWrapper.x = c.x - modelsWrapper.width / 2;
		modelsWrapper.y = c.y - modelsWrapper.height / 2;
	}

	BlobGroup {
		id: blobGroup

		color: root.open ? Colors.palette.m3surfaceContainerHighest : Colors.tPalette.m3surfaceContainer

		Behavior on color {
			CAnim {}
		}
	}

	MouseArea {
		id: backdrop

		anchors.fill: parent
		enabled: false
		hoverEnabled: enabled
		preventStealing: true
		parent: root.open ? root.rootParent : root

		onClicked: root.open = false
	}

	Item {
		id: modelsWrapper

		width: root.width
		height: modelBox.implicitHeight
		z: 1

		states: State {
			name: "open"
			when: root.open

			PropertyChanges {
				backdrop.enabled: true
				modelsBackground.radius: Tokens.rounding.largeIncreased
				modelsContent.opacity: 1
				modelsWrapper.height: root.openHeight
				modelsWrapper.width: root.openWidth
				modelsWrapper.x: (root.rootParent.width - root.openWidth) / 2
				modelsWrapper.y: root.rootParent.height - root.openHeight - Tokens.spacing.medium - Tokens.padding.medium - root.fabRoot.implicitHeight
				elevation.opacity: 1
				modelBox.opacity: 0
			}
		}
		transitions: Transition {
			id: dialogTransition

			SequentialAnimation {
				ScriptAction {
					script: root.reparentWrapper()
				}

				Anim {
					properties: "x,y"
				}
			}

			PropertyAction {
				property: "enabled"
			}

			Anim {
				properties: "opacity,radius"
				type: Anim.DefaultEffects
			}

			Anim {
				properties: "width,height"
			}
		}

		Elevation {
			id: elevation

			anchors.fill: parent
			level: 4
			opacity: 0
			radius: modelsBackground.radius

			transform: Matrix4x4 {
				matrix: modelsBackground.deformMatrix
			}
		}

		BlobRect {
			id: modelsBackground

			anchors.fill: parent
			radius: modelLayer.pressed ? Tokens.rounding.small : Tokens.rounding.extraLarge
			deformScale: 0
			group: blobGroup
			opacity: blobGroup.color.a * (root.enabled ? 1 : 0.5)

			Behavior on radius {
				Anim {
					type: Anim.DefaultEffects
				}
			}
		}

		CustomRect {
			id: modelBox
			anchors.left: parent.left
			anchors.right: parent.right
			anchors.top: parent.top
			implicitHeight: root.fabRoot.implicitHeight
			radius: modelsBackground.radius

			CustomText {
				id: label
				text: root.prettyModelName()
				color: Colors.palette.m3onSurfaceVariant
				anchors.left: parent.left
				anchors.leftMargin: Tokens.padding.large
				anchors.verticalCenter: parent.verticalCenter
			}

			MaterialIcon {
				color: Colors.palette.m3onSurfaceVariant
				anchors.right: parent.right
				anchors.rightMargin: Tokens.padding.large
				anchors.verticalCenter: parent.verticalCenter
				text: "unfold_more"
				fontStyle: Tokens.font.icon.large
			}

			StateLayer {
				id: modelLayer

				onClicked: {
					ChatState.fabExpanded = false;
					root.open = true;
				}
			}
		}

		Loader {
			id: modelsContent

			active: opacity > 0
			anchors.fill: parent
			asynchronous: false
			opacity: 0

			sourceComponent: MouseArea {
				readonly property alias modelsList: modelsList

				onWheel: event => event.accepted = true
				preventStealing: true
				clip: true
				implicitHeight: innerLayout.implicitHeight + innerLayout.anchors.margins * 2

				ColumnLayout {
					id: innerLayout
					anchors.bottomMargin: Tokens.padding.largeIncreased
					anchors.fill: parent
					anchors.margins: Tokens.padding.extraLarge
					spacing: 0

					CustomText {
						font: Tokens.font.title.builders.large.weight(Font.Normal).build()
						text: root.header
					}

					VerticalFadeListView {
						id: modelsList

						Layout.fillWidth: true
						Layout.leftMargin: root.horizontalContentMargin
						Layout.topMargin: Tokens.spacing.medium
						Layout.bottomMargin: Tokens.spacing.medium
						Layout.rightMargin: root.horizontalContentMargin
						Layout.preferredHeight: 400
						Layout.maximumHeight: 400
						model: LlmClient.availableModels
						currentIndex: LlmClient.availableModels.indexOf(LlmClient.model)
						visible: opacity > 0

						Behavior on opacity {
							Anim {}
						}

						CustomScrollBar.vertical: CustomScrollBar {
							flickable: modelsList
						}

						delegate: CustomRect {
							id: model

							required property var modelData
							required property int index
							readonly property bool selected: ListView.view.currentIndex === model.index

							implicitWidth: ListView.view.width
							implicitHeight: name.implicitHeight + Tokens.padding.small * 2
							radius: stateLayer.pressed ? Tokens.rounding.extraSmall : selected ? Tokens.rounding.largeIncreased : Tokens.rounding.medium
							color: Qt.alpha(Colors.palette.m3tertiaryContainer, selected ? 1 : 0)

							Behavior on radius {
								Anim {
									type: Anim.SlowEffects
								}
							}

							RowLayout {
								id: layout

								anchors.left: parent.left
								anchors.right: parent.right
								anchors.verticalCenter: parent.verticalCenter
								anchors.margins: Tokens.padding.small
								anchors.leftMargin: Tokens.padding.large
								anchors.rightMargin: Tokens.padding.large

								CustomText {
									id: name

									text: model.modelData
									elide: CustomText.ElideRight
									color: model.selected ? Colors.palette.m3onTertiaryContainer : Colors.palette.m3onSurface

									Layout.fillWidth: true
								}

								MaterialIcon {
									id: check

									color: Colors.palette.m3onTertiaryContainer
									fontStyle: Tokens.font.icon.medium
									opacity: model.selected ? 1 : 0
									visible: opacity > 0
									text: "check"

									Layout.alignment: Qt.AlignRight | Qt.AlignVCenter

									Behavior on opacity {
										Anim {
											type: Anim.SlowEffects
										}
									}
								}
							}

							StateLayer {
								id: stateLayer

								onClicked: {
									model.ListView.view.currentIndex = model.index;
								}
							}
						}
					}

					RowLayout {
						Layout.alignment: Qt.AlignRight
						spacing: Tokens.spacing.extraSmall

						TextButton {
							horizontalPadding: Tokens.padding.largeIncreased
							isRound: true
							text: qsTr("Cancel")
							type: TextButton.Text
							verticalPadding: Tokens.padding.small
							stateLayer.preventStealing: true

							onClicked: {
								root.open = false;
							}
						}

						TextButton {
							horizontalPadding: Tokens.padding.largeIncreased
							isRound: true
							text: root.acceptLabel
							type: TextButton.Text
							stateLayer.preventStealing: true
							verticalPadding: Tokens.padding.small

							onClicked: {
								LlmClient.selectModel(modelsList.currentItem.modelData);
								root.open = false;
							}
						}
					}
				}
			}
		}
	}
}