package net.shadowfacts.phycon.block.terminal

import net.minecraft.text.TranslatableText
import net.minecraft.util.math.MathHelper
import net.shadowfacts.cacao.geometry.Axis
import net.shadowfacts.cacao.geometry.Point
import net.shadowfacts.cacao.util.Color
import net.shadowfacts.cacao.util.LayoutGuide
import net.shadowfacts.cacao.util.MouseButton
import net.shadowfacts.cacao.view.Label
import net.shadowfacts.cacao.view.StackView
import net.shadowfacts.cacao.view.View
import net.shadowfacts.cacao.view.textfield.TextField
import net.shadowfacts.cacao.viewcontroller.ViewController
import net.shadowfacts.kiwidsl.dsl
import net.shadowfacts.phycon.client.screen.ScrollTrackView
import net.shadowfacts.phycon.util.TerminalSettings

/**
 * @author shadowfacts
 */
abstract class AbstractTerminalViewController<BE: AbstractTerminalBlockEntity, S: AbstractTerminalScreen<BE, H>, H: AbstractTerminalScreenHandler<BE>>(
	val screen: S,
	val handler: H,
	val terminal: BE = handler.terminal,
): ViewController() {

	private lateinit var scrollTrack: ScrollTrackView
	lateinit var settingsView: View
		private set
	lateinit var searchField: TextField
		private set

	lateinit var pane: LayoutGuide
		private set
	lateinit var buffer: LayoutGuide
		private set
	lateinit var network: LayoutGuide
		private set
	lateinit var playerInv: LayoutGuide
		private set

	lateinit var networkLabel: View
		private set
	lateinit var playerInvLabel: View
		private set
	lateinit var bufferLabel: View
		private set

	override fun loadView() {
		view = ScrollHandlingView(this)
	}

	override fun viewDidLoad() {
		super.viewDidLoad()

		pane = view.addLayoutGuide()
		view.solver.dsl {
			pane.centerXAnchor equalTo view.centerXAnchor
			pane.centerYAnchor equalTo view.centerYAnchor
			pane.widthAnchor equalTo screen.terminalBackgroundWidth
			pane.heightAnchor equalTo screen.terminalBackgroundHeight
		}

		buffer = view.addLayoutGuide()
		view.solver.dsl {
			buffer.leftAnchor equalTo (pane.leftAnchor + 7 + handler.xOffset)
			buffer.topAnchor equalTo (pane.topAnchor + 17)
			buffer.widthAnchor equalTo (18 * 3)
			buffer.heightAnchor equalTo (18 * 6)
		}

		network = view.addLayoutGuide()
		view.solver.dsl {
			network.leftAnchor equalTo (pane.leftAnchor + 65 + handler.xOffset)
			network.topAnchor equalTo buffer.topAnchor
			network.widthAnchor equalTo (18 * 9)
			network.heightAnchor equalTo (18 * 6)
		}

		playerInv = view.addLayoutGuide()
		view.solver.dsl {
			playerInv.leftAnchor equalTo network.leftAnchor
			playerInv.topAnchor equalTo (pane.topAnchor + 139)
			playerInv.widthAnchor equalTo (18 * 9)
			playerInv.heightAnchor equalTo 76
		}

		networkLabel = view.addSubview(Label(TranslatableText("gui.phycon.terminal_network"))).apply {
			textColor = Color.TEXT
		}
		playerInvLabel = view.addSubview(Label(handler.playerInv.displayName)).apply {
			textColor = Color.TEXT
		}
		bufferLabel = view.addSubview(Label(TranslatableText("gui.phycon.terminal_buffer"))).apply {
			textColor = Color.TEXT
		}

		searchField = view.addSubview(TerminalSearchField()).apply {
			handler = ::searchFieldChanged
			drawBackground = false
		}

		scrollTrack = view.addSubview(ScrollTrackView(::scrollPositionChanged))

		val settingsStack = view.addSubview(StackView(Axis.VERTICAL, spacing = 2.0))
		settingsView = settingsStack
		TerminalSettings.allKeys.sortedByDescending { it.priority }.forEach { key ->
			val button = SettingButton(key)
			button.handler = { settingsChanged() }
			settingsStack.addArrangedSubview(button)
		}

		view.solver.dsl {
			networkLabel.leftAnchor equalTo network.leftAnchor
			networkLabel.topAnchor equalTo (pane.topAnchor + 6)

			bufferLabel.leftAnchor equalTo buffer.leftAnchor
			bufferLabel.topAnchor equalTo networkLabel.topAnchor

			playerInvLabel.leftAnchor equalTo playerInv.leftAnchor
			playerInvLabel.topAnchor equalTo (pane.topAnchor + 128)

			searchField.leftAnchor equalTo (pane.leftAnchor + 138 + handler.xOffset)
			searchField.topAnchor equalTo (pane.topAnchor + 5)
			searchField.widthAnchor equalTo 80
			searchField.heightAnchor equalTo 9

			scrollTrack.leftAnchor equalTo (pane.leftAnchor + 232 + handler.xOffset)
			scrollTrack.topAnchor equalTo (network.topAnchor + 1)
			scrollTrack.bottomAnchor equalTo (network.bottomAnchor - 1)
			scrollTrack.widthAnchor equalTo 12

			settingsStack.leftAnchor equalTo (pane.rightAnchor + 4)
			settingsStack.topAnchor equalTo pane.topAnchor
		}
	}

	override fun viewWillAppear() {
		super.viewWillAppear()

		searchField.becomeFirstResponder()
	}

	private fun searchFieldChanged(field: TextField) {
		screen.searchQuery = field.text
		screen.requestUpdatedItems()
	}

	private fun scrollPositionChanged(track: ScrollTrackView) {
		val oldOffset = handler.currentScrollOffsetInRows()

		handler.scrollPosition = track.scrollPosition.toFloat()
		screen.scrollPosition = track.scrollPosition

		if (handler.currentScrollOffsetInRows() != oldOffset) {
			screen.requestUpdatedItems()
		}
	}

	private fun settingsChanged() {
		screen.requestUpdatedItems()
	}

	class TerminalSearchField: TextField("") {
		override fun mouseClickedOutside(point: Point, mouseButton: MouseButton) {
			// no-op
		}
	}

	class ScrollHandlingView(val vc: AbstractTerminalViewController<*, *, *>): View() {
		override fun mouseScrolled(point: Point, amount: Double): Boolean {
			var newOffsetInRows = vc.handler.currentScrollOffsetInRows() - amount.toInt()
			newOffsetInRows = MathHelper.clamp(newOffsetInRows, 0, vc.handler.maxScrollOffsetInRows())
			if (newOffsetInRows != vc.handler.currentScrollOffsetInRows()) {
				val newScrollPosition = newOffsetInRows / vc.handler.maxScrollOffsetInRows().toDouble()
				vc.screen.scrollPosition = newScrollPosition
				vc.scrollTrack.scrollPosition = newScrollPosition
				vc.screen.requestUpdatedItems()
			}

			return true
		}
	}

}