//
//  TableView.swift
//  react-native-simple-grid
//
//  Created by Vittorio Cellucci on 2022-11-03.
//

import Foundation
class TableView: UIView {
  weak var headerView: HeaderView?
  weak var totalView: TotalsView?
  weak var totalRowsView: TotalCellsView?
  weak var dataCollectionView: DataCollectionView?
  weak var horizontalScrolLView: UIScrollView?
  weak var lastGrabber: LastColumnResizer?
  weak var firstGrabber: ColumnResizerView?
  weak var adjacentTable: TableView?
  var needsShadow = false
  var shaddowOffset: Float = 0.0
  var isFirst = false
  var dynamicWidth = NSLayoutConstraint()
  var dymaniceLeadingAnchor = NSLayoutConstraint()
  var columnWidths: ColumnWidths?
  var grabbers = [() -> MultiColumnResizer?]()
  var dataRange: CountableRange = 0..<1
  func grow(by delta: Double) {
    dynamicWidth.constant = self.frame.width + delta
  }

  func setWidth(_ width: Double) {
    dynamicWidth.constant = width
    self.layoutIfNeeded()
  }

  func resizeCells() {
    guard let columnWidths = columnWidths else { return }
    guard let dataCollectionView = dataCollectionView else { return }

    let width = columnWidths.getTotalWidth(range: dataRange)
    setWidth(width)

    if let headerView = headerView {
      headerView.resizeLabels()
    }

    if let totalView = totalView {
      totalView.resizeLabels()
    }

    dataCollectionView.resizeCells()
    updateScrollContentSize(columnWidths)
    repositionGrabbers(columnWidths, width: width)

    if let adjacentTable = adjacentTable {
      adjacentTable.dymaniceLeadingAnchor.constant = columnWidths.columnWidths[0]
      adjacentTable.setNeedsLayout()
    }
  }

  func updateScrollContentSize(_ columnWidths: ColumnWidths) {
    if let horizontalScrollView = horizontalScrolLView {
      let totalWidth = columnWidths.getTotalWidth()
      horizontalScrollView.contentSize = CGSize(width: totalWidth, height: 0)
      horizontalScrollView.setContentOffset(CGPoint.zero, animated: true)
    }
  }

  func repositionGrabbers(_ columnWidths: ColumnWidths, width: Double) {
    if !isFirst {
      if columnWidths.count() > 1 && !grabbers.isEmpty {
        let range = 1..<columnWidths.count() - 1
        var x = 0.0
        columnWidths.columnWidths[range].enumerated().forEach {(index, width) in
          x += width
          let grabber = grabbers[index]()
          grabber?.centerConstraint.constant = x
          grabber?.setNeedsLayout()
        }
      }
    }

    if let firstGrabber = firstGrabber {
      firstGrabber.centerConstraint.constant = columnWidths.columnWidths[0]
      firstGrabber.layoutIfNeeded()
    }

    if let lastGrabber = lastGrabber {
      lastGrabber.centerConstraint.constant = width
      lastGrabber.layoutIfNeeded()
    }

  }

  func updateGrabbers(_ height: Double) {
    if let firstGrabber = firstGrabber {
      firstGrabber.setHeight(height)
    }
    for resizer in grabbers {
      resizer()?.setHeight(height)
    }
  }

  func setShadow(offset: Float) {
    self.layer.shadowOffset = CGSize(width: 1, height: 1)
    self.layer.shadowRadius = 2
    self.layer.shadowColor = UIColor.gray.cgColor
    self.layer.shadowOpacity = offset
  }

  func horizontalScrollOffset(_ x: CGFloat) {
    dataCollectionView?.childCollectionView?.horizontalScrollOffset(x)
  }
}