import Quickshell
import QtQuick
import QtQuick.Layouts

import "components"
import qs.components
import qs.config

// TODO: currently, we're relying on the compositor to provide the animation which ig is fine, but we should use our own in the future, however it might look weird combined with the compositors's
ILauncher {
	id: launcher

	property list<Component> widgetItems: Launcher.widgets
	property var state: SelectionState

	name: "quickshell::launcher::launcher"

	anchors.top: true
	margins.top: Launcher.topMargin
	aboveWindows: true
	exclusionMode: ExclusionMode.Ignore

	IRect {
		id: container
		property var selection: launcher.state?.selected
		property var mappedSelection: selection?.mapToItem(null, 0, 0)

		onMappedSelectionChanged: {
			// launcher.state?.selected may be slow.. smh qt
			// my guess is mapToItem is called when its not finished doing whatever it needs to do,
			// so it doesnt get the right vars, but it doesn't update after since it already triggered it
			selectionSync.running = true;
		}

		// for some reason selection changing doesnt call onMappedSelectionChanged, so we manually trigger it
		onSelectionChanged: {
			selectionSync.running = true;
		}

		Timer {
			id: selectionSync
			// TODO: evaluate weather i just leave it running repeat, might be costy though
			running: false
			repeat: false
			// sync w/ IComponent y animation duration
			interval: General.animationDuration / 4
			onTriggered: {
				parent.mappedSelection = launcher.state?.selected?.mapToItem(null, 0, 0);
			}
		}

		IRect {
			id: activeRect
			visible: parent.mappedSelection || false
			y: parent.mappedSelection?.y || 0
			x: parent.mappedSelection?.x || 0
			implicitWidth: launcher.state?.selected?.width || 0
			implicitHeight: launcher.state?.selected?.height || 0
			radius: Launcher.borderRadius
			color: Qt.rgba(Colors.background1.r, Colors.background1.g, Colors.background1.b, Launcher.bgTransparency)
			Behavior on x {
				ISpringAnimation {
					id: springAnim
					speed: 1.5
				}
			}
			Behavior on y {
				ISpringAnimation {
					speed: 1.5
				}
			}
			Behavior on implicitWidth {
				NumberAnimation {
					duration: springAnim.duration
					easing.type: Easing.BezierSpline
					// fast slow
					easing.bezierCurve: [0.33, 0.8, 0, 1]
				}
			}
			Behavior on implicitHeight {
				NumberAnimation {
					duration: springAnim.duration
					easing.type: Easing.BezierSpline
					// fast slow
					easing.bezierCurve: [0.33, 0.8, 0, 1]
				}
			}
		}
		color: Qt.rgba(Colors.background3.r, Colors.background3.g, Colors.background3.b, Launcher.bgTransparency)
		radius: Launcher.borderRadius

		width: Math.max(root.width, Launcher.defaultWidth) + Launcher.innerMargin
		height: root.height

		IRect {
			id: root
			property alias input: textInput.text

			height: searchBar.height + widgets.height + textInput.height / 2 // * 1.5
			width: Math.max(widgets.implicitWidth, Launcher.defaultWidth)

			anchors.centerIn: parent

			color: "transparent"

			RowLayout {
				id: searchBar
				anchors {
					top: parent.top
					left: parent.left
					right: parent.right
					leftMargin: Launcher.innerMargin
					rightMargin: Launcher.innerMargin
					// try to center it when no widgets are present
					topMargin: widgets.height === Launcher.widgets.length * 5 - 5 ? parent.height / 2 - textInput.height / 2 : Launcher.innerMargin // textInput or Icon is the height of this

					Behavior on topMargin {
						ISpringAnimation {}
					}
				}

				spacing: Launcher.innerMargin * 2

				Icon {
					text: ""
				}

				RowLayout {
					spacing: 0
					TextInput {
						id: textInput
						property bool pendingUpdate: false
						Keys.onPressed: event => {
							if (event.key === Qt.Key_End || event.key === Qt.Key_Home) {
								if (event.key === Qt.Key_End) {
									endShortcut.activated();
								} else if (event.key === Qt.Key_Home) {
									homeShortcut.activated();
								}
								event.accepted = true;
							}
						}

						Layout.fillHeight: true
						Layout.fillWidth: true
						Layout.maximumWidth: implicitWidth

						color: Colors.foreground1
						selectionColor: Colors.background3

						text: launcher.state?.input || ""
						clip: true
						focus: true

						antialiasing: true
						smooth: true
						font {
							pixelSize: Style.font.size.large
							family: Style.font.family.sans
							wordSpacing: 5
						}
						// move to different file if we have more textinput
						cursorDelegate: IRect {
							id: cursor
							color: Colors.cursor
							// width: 1.5
							width: 2
							height: 1
							// blinking animation
							SequentialAnimation {
								running: true
								loops: Animation.Infinite
								PauseAnimation {
									duration: 500
								}
								ParallelAnimation {
									PropertyAnimation {
										target: cursor
										property: "opacity"
										to: 0
										duration: General.animationDuration / 5
									}
									PropertyAnimation {
										target: cursor
										property: "scale"
										to: 0
										duration: General.animationDuration / 5
									}
								}
								PauseAnimation {
									duration: 500
								}
								ParallelAnimation {
									PropertyAnimation {
										target: cursor
										property: "opacity"
										to: 1
										duration: General.animationDuration / 5
									}
									PropertyAnimation {
										target: cursor
										property: "scale"
										to: 1
										duration: General.animationDuration / 5
									}
								}
							}
						}
						HoverHandler {
							cursorShape: Qt.IBeamCursor
						}
						onTextChanged: {
							if (launcher.state.input !== textInput.text)
								pendingUpdate = true;

							Qt.callLater(() => {
								if (pendingUpdate) {
									pendingUpdate = false;
									launcher.state.input = textInput.text; // TODO: find ways to optimize this, like how i was using an alias
								}
							});
						}
						onCursorPositionChanged: {
							launcher.state.cursorPosition = textInput.cursorPosition;
						}
						// onActiveFocusChanged: {
						//     parentLoader.active = activeFocus;
						// }
						onAccepted: {
							launcher.state?.priorities[launcher.state.selectedPriority]?._exec(); // TODO: kde like waiting animation for app to launch
							parentLoader.active = false;
							textInput.text = "";
						}
						Component.onCompleted: {
							selectAll();
						}
					}
					IRect {
						opacity: launcher.state?.priorities[launcher.state.selectedPriority]?.predictiveCompletion ? 1 : 0
						Layout.fillHeight: true
						Layout.preferredWidth: text.width
						radius: Launcher.predictiveCompletionRadius
						color: Qt.rgba(Colors.background2.r, Colors.background2.g, Colors.background2.b, Launcher.widgetBgTransparency)
						IText {
							id: text
							// animate: true // too jumpy
							color: Colors.foreground3
							renderType: Text.CurveRendering
							antialiasing: true
							smooth: true
							font {
								pixelSize: Style.font.size.large
								family: Style.font.family.sans
								wordSpacing: 5
							}
							text: launcher.state?.priorities[launcher.state.selectedPriority]?.predictiveCompletion || ""
						}
						Behavior on Layout.preferredWidth {
							ISpringAnimation {}
							// NumberAnimation {
							//     duration: General.animationDuration / 5
							// }
						}
						Behavior on opacity {
							NumberAnimation {
								duration: General.animationDuration / 2
								easing.type: Easing.InOutQuad
							}
						}
					}
					Item {
						Layout.fillWidth: true
					}
					Loader {
						active: launcher.state?.priorities[launcher.state.selectedPriority]?.priority || false // .priority should always be true if it's in priorities
						sourceComponent: launcher.state?.priorities[launcher.state.selectedPriority]?.preview
					}
				}
			}

			ColumnLayout {
				id: widgets
				anchors {
					top: searchBar.bottom
					left: parent.left
					right: parent.right
					topMargin: Launcher.innerMargin * 1.5 // gap in between, maybe seperator FIXME
				}

				Repeater {
					model: launcher.widgetItems
					delegate: Loader {
						active: true
						visible: item?.valid ?? true // not item?.standalone cuz when its standalone it doesnt appear in launcher.widgetItems
						sourceComponent: modelData
						asynchronous: true
						onLoaded: {
							launcher.state.widgets[index] = item;
							// FIXME: prev predictiveCompletion still exists here
							// workaround atm: just clear it or preserve the text manually
						}

						Connections {
							target: item
							ignoreUnknownSignals: true

							function onClose() {
								parentLoader.active = false;
							}
						}
					}
				}
			}
		}

		// not Keys.onPressed because textinput will steal it
		Shortcut {
			sequence: "Escape"
			context: Qt.ApplicationShortcut
			onActivated: parentLoader.active = false
		}

		Shortcut {
			sequence: "Ctrl+H"
			context: Qt.ApplicationShortcut
			onActivated: changePos(1)
		}

		Shortcut {
			sequence: "Ctrl+J"
			context: Qt.ApplicationShortcut
			onActivated: changePos(-2)
		}

		Shortcut {
			sequence: "Ctrl+K"
			context: Qt.ApplicationShortcut
			onActivated: changePos(2)
		}

		Shortcut {
			sequence: "Ctrl+L"
			context: Qt.ApplicationShortcut
			onActivated: changePos(-1)
		}

		Shortcut {
			sequence: "Down"
			context: Qt.ApplicationShortcut
			onActivated: changePos(-2)
		}

		Shortcut {
			sequence: "Up"
			context: Qt.ApplicationShortcut
			onActivated: changePos(2)
		}

		Shortcut {
			sequence: "PgDown"
			context: Qt.ApplicationShortcut
			onActivated: changePos(-20)
		}

		Shortcut {
			sequence: "PgUp"
			context: Qt.ApplicationShortcut
			onActivated: changePos(20)
		}

		Shortcut {
			id: homeShortcut
			sequence: "Home"
			context: Qt.ApplicationShortcut
			onActivated: changePos(200)
		}

		Shortcut {
			id: endShortcut
			sequence: StandardKey.MoveToEndOfDocument
			context: Qt.ApplicationShortcut
			onActivated: changePos(-200)
		}
	}
	// 1 = left
	// -1 = right
	// 2 = up
	// -2 = down
	function changePos(direction: int) {
		const item = launcher.state?.priorities[launcher.state.selectedPriority];
		if (!item)
			return;

		let set = 0;

		switch (direction) {
		case 1:
			if (item.prev())
				set = -1;
			break;
		case -1:
			if (item.next())
				set = 1;
			break;
		case 2:
			if (item.up())
				set = -1;
			break;
		case -2:
			if (item.down())
				set = 1;
			break;
		case 20:
			if (item.pgup())
				set = -1;
			break;
		case -20:
			if (item.pgdn())
				set = 1;
			break;
		case 200:
			if (item.home())
				set = -1;
			break;
		case -200:
			if (item.end())
				set = 1;
			break;
		}

		if (set !== 0) {
			switch (set) {
			case 1:
				if (launcher.state.selectedPriority < launcher.state.priorities.length - 1) {
					launcher.state.selectedPriority++;
					launcher.state.priorities[launcher.state.selectedPriority].home();
				}
				break;
			case -1:
				if (launcher.state.selectedPriority > 0) {
					launcher.state.selectedPriority--;
					launcher.state.priorities[launcher.state.selectedPriority].end();
				}
				break;
			}
		}
	}

	implicitWidth: container.width
	implicitHeight: container.height

	Connections {
		target: launcher?.state
		// launcher.state may be null
		ignoreUnknownSignals: true

		function onSyncSelectionState() {
			selectionSync.running = true;
		}
	}
}