from PyQt5.QtWidgets import QWidget, QVBoxLayout, QLabel, QComboBox, QHBoxLayout, QPushButton, QLineEdit, QListWidget, QListWidgetItem
from PyQt5.QtCore import Qt
from dusk.entity import Entity
from dusk.defs import CHUNK_WIDTH, CHUNK_HEIGHT, CHUNK_DEPTH, ENTITY_TYPES, ENTITY_TYPE_NULL

class EntityPanel(QWidget):
  def __init__(self, parent):
    super().__init__(parent)
    self.parent = parent
    layout = QVBoxLayout(self)
    self.setLayout(layout)

    # Top panel placeholder
    topWidget = QLabel("Entity Editor (top)")
    layout.addWidget(topWidget)

    # Name input
    nameLayout = QHBoxLayout()
    nameLabel = QLabel("Name:")
    self.nameInput = QLineEdit()
    nameLayout.addWidget(nameLabel)
    nameLayout.addWidget(self.nameInput)
    layout.addLayout(nameLayout)

    # Entity Type dropdown (single selection)
    typeLayout = QHBoxLayout()
    typeLabel = QLabel("Type:")
    self.typeDropdown = QComboBox()
    self.typeDropdown.addItems(ENTITY_TYPES)
    typeLayout.addWidget(typeLabel)
    typeLayout.addWidget(self.typeDropdown)
    layout.addLayout(typeLayout)

    # Entity list and buttons
    self.entityList = QListWidget()
    self.entityList.addItems([])
    layout.addWidget(self.entityList, stretch=1)

    btnLayout = QHBoxLayout()
    self.btnAdd = QPushButton("Add")
    self.btnRemove = QPushButton("Remove")
    btnLayout.addWidget(self.btnAdd)
    btnLayout.addWidget(self.btnRemove)
    layout.addLayout(btnLayout)

    # Events
    self.btnAdd.clicked.connect(self.onAddEntity)
    self.btnRemove.clicked.connect(self.onRemoveEntity)
    self.parent.map.onEntityData.sub(self.onEntityData)
    self.parent.map.onPositionChange.sub(self.onPositionChange)
    self.entityList.itemClicked.connect(self.onEntityClicked)
    self.entityList.itemDoubleClicked.connect(self.onEntityDoubleClicked)
    self.typeDropdown.currentIndexChanged.connect(self.onTypeSelected)
    self.nameInput.textChanged.connect(self.onNameChanged)

    # Call once to populate
    self.onEntityData()
    self.onEntityUnselect()

  def onEntityUnselect(self):
    self.entityList.setCurrentItem(None)
    self.nameInput.setText("")
    self.typeDropdown.setCurrentIndex(ENTITY_TYPE_NULL)

  def onEntitySelect(self, entity):
    self.entityList.setCurrentItem(entity.item)
    self.nameInput.setText(entity.name)
    self.typeDropdown.setCurrentIndex(entity.type)

  def onEntityDoubleClicked(self, item):
    entity = item.data(Qt.UserRole)
    chunk = entity.chunk
    worldX = chunk.x + entity.localX
    worldY = chunk.y + entity.localY
    worldZ = chunk.z + entity.localZ
    self.parent.map.moveTo(worldX, worldY, worldZ)

  def onEntityClicked(self, item):
    pass

  def onAddEntity(self):
    chunk = self.parent.map.getChunkAtWorldPos(*self.parent.map.position)
    if chunk is None:
      return
    ent = chunk.addEntity(
      self.parent.map.position[0] - chunk.x,
      self.parent.map.position[1] - chunk.y,
      self.parent.map.position[2] - chunk.z
    )

  def onRemoveEntity(self):
    item = self.entityList.currentItem()
    if item is None:
      return
    entity = item.data(Qt.UserRole)
    if entity:
      chunk = entity.chunk
      chunk.removeEntity(entity)
    pass

  def onEntityData(self):
    self.onEntityUnselect()
    self.entityList.clear()
    for chunk in self.parent.map.chunks.values():
      for id, entity in chunk.entities.items():
        item = QListWidgetItem(entity.name)
        item.setData(Qt.UserRole, entity)  # Store the entity object
        entity.item = item
        self.entityList.addItem(item)

    # Select if there is something at current position
    self.onPositionChange(self.parent.map.position)

  def onPositionChange(self, position):
    self.onEntityUnselect()

    # Get Entity at..
    chunk = self.parent.map.getChunkAtWorldPos(*position)
    if chunk is None:
      return
    
    localX = position[0] - chunk.x
    localY = position[1] - chunk.y
    localZ = position[2] - chunk.z
    
    for ent in chunk.entities.values():
      if ent.localX != localX or ent.localY != localY or ent.localZ != localZ:
          continue
      self.onEntitySelect(ent)
      self.entityList.setCurrentItem(ent.item)
      break

  def onTypeSelected(self, index):
    item = self.entityList.currentItem()
    if item is None:
      return
    entity = item.data(Qt.UserRole)
    if entity:
      entity.setType(index)

  def onNameChanged(self, text):
    item = self.entityList.currentItem()
    if item is None:
      return
    entity = item.data(Qt.UserRole)
    if entity:
      entity.setName(text)