//
//  FFSheetView.swift
//  FFAlert
//
//  Created by FFIB on 2017/11/17.
//  Copyright © 2017年 FFIB. All rights reserved.
//

import UIKit

class FFSheetView: UIView, FFAlertRepresentable {
    var contentView: UIView?

    var contentHeight: CGFloat = 0

    var tableView = UITableView()
    var contentEdgInsets = UIEdgeInsets(top: 0, left: 6, bottom: 0, right: 6)
    var title: NSAttributedString?
    var message: NSAttributedString?
    var edgInsets: (left: CGFloat, right: CGFloat) = (0, 0)
    let separactorColor = UIColor(red: 226 / 255, green: 226 / 255, blue: 226 / 255, alpha: 1)
    let separactorHeight: CGFloat = 6
    var alertActions = [FFAlertAction]()

    var titleLabel = FFAlertLabel()
    var messageLabel = FFAlertLabel()

    private let labelLeading: CGFloat = 12
    private let labelTrailing: CGFloat = 12
    private var titleTop: CGFloat = 10
    private var messageTop: CGFloat = 14
    private var isNeedlayout = true

    override func layoutSubviews() {
        super.layoutSubviews()
        if isNeedlayout {
            configurationOfTitle()
            configurationOfMessage()
            configurationOfContentView()
            configurationOfTableView()
            isNeedlayout = false
        }

    }

    private func configurationOfContentView() {
        if contentView == nil {
            contentView = UIView()
        }
        addSubview(contentView!)
        contentView!.translatesAutoresizingMaskIntoConstraints = false

        NSLayoutConstraint.activate(
            [NSLayoutConstraint(item: contentView!, attribute: .leading,
                                relatedBy: .equal,
                                toItem: self, attribute: .leading,
                                multiplier: 1, constant: contentEdgInsets.left),
             NSLayoutConstraint(item: contentView!, attribute: .trailing,
                                relatedBy: .equal,
                                toItem: self, attribute: .trailing,
                                multiplier: 1, constant: -contentEdgInsets.right),
             NSLayoutConstraint(item: contentView!, attribute: .top,
                                relatedBy: .equal,
                                toItem: messageLabel, attribute: .bottom,
                                multiplier: 1, constant: contentEdgInsets.top),
             NSLayoutConstraint(item: contentView!, attribute: .height,
                                relatedBy: .equal,
                                toItem: nil, attribute: .height,
                                multiplier: 1, constant: contentHeight)]
        )
    }

    private func configurationOfTableView() {
        addSubview(tableView)
        tableView.translatesAutoresizingMaskIntoConstraints = false
        tableView.delegate = self
        tableView.dataSource = self
        tableView.separatorStyle = .none
        tableView.register(FFSheetActionCell.classForCoder(), forCellReuseIdentifier: "FFSheetViewCell")
        NSLayoutConstraint.activate(
            [NSLayoutConstraint(item: tableView, attribute: .leading,
                                relatedBy: .equal,
                                toItem: self, attribute: .leading,
                                multiplier: 1, constant: 0),
             NSLayoutConstraint(item: tableView, attribute: .trailing,
                                relatedBy: .equal,
                                toItem: self, attribute: .trailing,
                                multiplier: 1, constant: 0),
             NSLayoutConstraint(item: tableView, attribute: .top,
                                relatedBy: .equal,
                                toItem: contentView, attribute: .bottom,
                                multiplier: 1, constant: 0),
             NSLayoutConstraint(item: tableView, attribute: .bottom,
                                relatedBy: .equal,
                                toItem: self, attribute: .bottom,
                                multiplier: 1, constant: 0),
             NSLayoutConstraint(item: tableView, attribute: .height,
                                relatedBy: .equal,
                                toItem: nil, attribute: .height,
                                multiplier: 1, constant: CGFloat(alertActions.count * 44))]
        )
    }

    private func configurationOfTitle() {
        addSubview(titleLabel)
        titleLabel.attributedText = title
        titleTop = title!.string.isEmpty ? 0 : titleTop
        titleLabel.sizeToFit()
        NSLayoutConstraint.activate(
            [NSLayoutConstraint(item: titleLabel, attribute: .leading,
                                relatedBy: .equal,
                                toItem: self, attribute: .leading,
                                multiplier: 1, constant: labelLeading),
             NSLayoutConstraint(item: titleLabel, attribute: .trailing,
                                relatedBy: .equal,
                                toItem: self, attribute: .trailing,
                                multiplier: 1, constant: -labelTrailing),
             NSLayoutConstraint(item: titleLabel, attribute: .top,
                                relatedBy: .equal,
                                toItem: self, attribute: .top,
                                multiplier: 1, constant: titleTop)]
        )
    }

    private func configurationOfMessage() {
        addSubview(messageLabel)
        messageLabel.attributedText = message
        messageTop = message!.string.isEmpty ? 0 : messageTop
        messageLabel.sizeToFit()
        NSLayoutConstraint.activate(
            [NSLayoutConstraint(item: messageLabel, attribute: .leading,
                                relatedBy: .equal,
                                toItem: self, attribute: .leading,
                                multiplier: 1, constant: labelLeading),
             NSLayoutConstraint(item: messageLabel, attribute: .trailing,
                                relatedBy: .equal,
                                toItem: self, attribute: .trailing,
                                multiplier: 1, constant: -labelTrailing),
             NSLayoutConstraint(item: messageLabel, attribute: .top,
                                relatedBy: .equal,
                                toItem: titleLabel, attribute: .bottom,
                                multiplier: 1, constant: messageTop)]
        )
    }

}

extension FFSheetView: UITableViewDelegate {
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        if indexPath.row == alertActions.count - 1 {
            return 44
        }
        return 50
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        var r = next
        while r != nil {
            if let ctl = r as? UIViewController, ctl.isKind(of: FFAlertController.classForCoder()) {
                ctl.dismiss(animated: true, completion: nil)
            }
            r = r?.next
        }
        let alertAction = alertActions[indexPath.row]
        if let handler = alertAction.handler {
            handler(alertAction)
        }
    }
}

extension FFSheetView: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return alertActions.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "FFSheetViewCell", for: indexPath) as! FFSheetActionCell
        let alertAction = alertActions[indexPath.row]
        if indexPath.row < alertActions.count - 1 {
            let edgInsets = alertAction.contentEdgInsets ?? UIEdgeInsets.zero
            alertAction.contentEdgInsets?.bottom = edgInsets.bottom - separactorHeight
        }

        cell.setInfo(alertAction: alertAction)
        cell.backgroundColor = separactorColor
        return cell
    }

}