//
//  FeedbackViewController.swift
//  VenusKitto
//
//  Created by Neoa on 2025/8/27.
//

import Foundation
import UIKit

final class VKWhistleBoardController: UIViewController {
    
    // MARK: - UI Elements
    
    // 问题描述部分
    private let bx_wrap: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()
    
    private let bx_bar: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(hex: "#FFE059")
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()
    
    private let bx_title: UILabel = {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        
        // 创建属性字符串
        let mainString = "问题描述（必填）"
        let attributedString = NSMutableAttributedString(string: mainString)
        
        // 设置整体样式
        attributedString.addAttributes([
            .font: UIFont.systemFont(ofSize: 15),
            .foregroundColor: UIColor.black
        ], range: NSRange(location: 0, length: mainString.count))
        
        // 将"（必填）"设置为红色
        if let range = mainString.range(of: "（必填）") {
            let nsRange = NSRange(range, in: mainString)
            attributedString.addAttributes([
                .foregroundColor: UIColor.red
            ], range: nsRange)
        }
        
        label.attributedText = attributedString
        return label
    }()
    
    private let bx_hint: UILabel = {
        let label = UILabel()
        label.text = "请尽量将问题描述详细"
        label.font = UIFont.boldSystemFont(ofSize: 14)
        label.textAlignment = .left
        label.textColor = .lightGray
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()

    
    private let bx_text: UITextView = {
        let textView = UITextView()
        textView.font = UIFont.systemFont(ofSize: 16)
        textView.text = ""
        textView.textColor = .lightGray
        textView.layer.borderWidth = 0.5
        textView.layer.borderColor = UIColor.lightGray.cgColor
        textView.layer.cornerRadius = 4
        textView.translatesAutoresizingMaskIntoConstraints = false
        return textView
    }()
        
    // 联系方式部分
    private let cx_wrap: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()
    
    private let cx_bar: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(hex: "#FFE059")
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()
    
    private let cx_title: UILabel = {
        let label = UILabel()
        label.text = "联系方式（选填）"
        label.font = UIFont.systemFont(ofSize: 15)
        label.textColor = .black
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()
    
    private let cx_hint: UILabel = {
        let label = UILabel()
        label.text = "请输入手机号或QQ号"
        label.font = UIFont.systemFont(ofSize: 14)
        label.textColor = .lightGray
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()

    private let cx_text: UITextView = {
        let textView = UITextView()
        textView.font = UIFont.systemFont(ofSize: 16)
        textView.text = ""
        textView.textColor = .lightGray
        textView.layer.borderWidth = 0.5
        textView.layer.borderColor = UIColor.lightGray.cgColor
        textView.layer.cornerRadius = 4
        textView.translatesAutoresizingMaskIntoConstraints = false
        return textView
    }()

        
    private let mx_commit: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("提交反馈", for: .normal)
        button.titleLabel?.font = UIFont.systemFont(ofSize: 16)
        button.setTitleColor(.black, for: .normal)
        button.backgroundColor = UIColor(hex: "#FFE059")
        button.layer.cornerRadius = 25
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()
        
    // MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
        buildUI()
        wireConstraints()
        hookDelegates()
        installGestures()
        
        
        navigationItem.title = "意见反馈"
        navigationItem.leftBarButtonItem = UIBarButtonItem(
            image: UIImage(systemName: "chevron.left"),
            style: .plain,
            target: self,
            action: #selector(ax_back)
        )
        navigationController?.navigationBar.tintColor = .black

        mx_commit.addTarget(self, action: #selector(ax_submit), for: .touchUpInside)
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        navigationController?.setNavigationBarHidden(false, animated: animated)
    }
    
    @objc private func ax_submit() {
        // 验证问题描述是否为空
        if bx_text.text.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
            vx_emit("请填写问题描述")
            return
        }
        // TODO: 在此处添加提交反馈的逻辑
        vx_emit("提交成功")
        // 延迟后返回上一页
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) {
            self.navigationController?.popViewController(animated: true)
        }
    }

    private func vx_emit(_ message: String) {
        let toastLabel = UILabel()
        toastLabel.text = message
        toastLabel.font = UIFont.systemFont(ofSize: 14)
        toastLabel.textColor = .white
        toastLabel.backgroundColor = UIColor.black.withAlphaComponent(0.7)
        toastLabel.textAlignment = .center
        toastLabel.alpha = 0.0
        toastLabel.layer.cornerRadius = 8
        toastLabel.clipsToBounds = true
        toastLabel.translatesAutoresizingMaskIntoConstraints = false
        
        view.addSubview(toastLabel)
        
        NSLayoutConstraint.activate([
            toastLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            toastLabel.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -100),
            toastLabel.widthAnchor.constraint(equalToConstant: 160),
            toastLabel.heightAnchor.constraint(equalToConstant: 40)
        ])
        
        UIView.animate(withDuration: 0.3) {
            toastLabel.alpha = 1.0
        } completion: { _ in
            DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
                UIView.animate(withDuration: 0.3) {
                    toastLabel.alpha = 0.0
                } completion: { _ in
                    toastLabel.removeFromSuperview()
                }
            }
        }
    }

    // MARK: - Setup
    private func buildUI() {
        view.backgroundColor = .white
        
        // 添加主要视图组件
        view.addSubview(bx_wrap)
        view.addSubview(bx_hint)
        view.addSubview(cx_wrap)
        view.addSubview(mx_commit)
        
        // 问题描述容器内的组件
        bx_wrap.addSubview(bx_bar)
        bx_wrap.addSubview(bx_title)
        bx_wrap.addSubview(bx_text)
        
        // 联系方式容器内的组件
        cx_wrap.addSubview(cx_bar)
        cx_wrap.addSubview(cx_title)
        cx_wrap.addSubview(cx_hint)
        cx_wrap.addSubview(cx_text)
    }
    
    private func wireConstraints() {
        // 问题描述容器
        NSLayoutConstraint.activate([
            bx_wrap.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20),
            bx_wrap.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16),
            bx_wrap.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16),
        ])
        
        // 蓝色分割线
        NSLayoutConstraint.activate([
            bx_bar.leadingAnchor.constraint(equalTo: bx_wrap.leadingAnchor),
            bx_bar.topAnchor.constraint(equalTo: bx_title.topAnchor),
            bx_bar.bottomAnchor.constraint(equalTo: bx_title.bottomAnchor),
            bx_bar.widthAnchor.constraint(equalToConstant: 3),
        ])
        
        // 问题描述标题和文本框
        NSLayoutConstraint.activate([
            bx_title.leadingAnchor.constraint(equalTo: bx_bar.trailingAnchor, constant: 8),
            bx_title.trailingAnchor.constraint(equalTo: bx_wrap.trailingAnchor),
            bx_title.topAnchor.constraint(equalTo: bx_wrap.topAnchor),
            
            bx_hint.leadingAnchor.constraint(equalTo: bx_title.leadingAnchor, constant: 0),
            bx_hint.topAnchor.constraint(equalTo: bx_title.bottomAnchor, constant: 8),
            
            bx_text.topAnchor.constraint(equalTo: bx_hint.bottomAnchor, constant: 8),
            bx_text.leadingAnchor.constraint(equalTo: bx_wrap.leadingAnchor, constant: 8),
            bx_text.trailingAnchor.constraint(equalTo: bx_wrap.trailingAnchor, constant: -8),
            bx_text.heightAnchor.constraint(equalToConstant: 150),
            bx_text.bottomAnchor.constraint(equalTo: bx_wrap.bottomAnchor),
        ])
        
        // 联系方式容器
        NSLayoutConstraint.activate([
            cx_wrap.topAnchor.constraint(equalTo: bx_wrap.bottomAnchor),
            cx_wrap.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16),
            cx_wrap.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16),
        ])
        
        // 蓝色分割线
        NSLayoutConstraint.activate([
            cx_bar.leadingAnchor.constraint(equalTo: cx_wrap.leadingAnchor),
            cx_bar.topAnchor.constraint(equalTo: cx_title.topAnchor),
            cx_bar.bottomAnchor.constraint(equalTo: cx_title.bottomAnchor),
            cx_bar.widthAnchor.constraint(equalToConstant: 3),
        ])
        
        // 联系方式标题和文本框
        NSLayoutConstraint.activate([
            cx_title.leadingAnchor.constraint(equalTo: cx_bar.trailingAnchor, constant: 8),
            cx_title.trailingAnchor.constraint(equalTo: cx_wrap.trailingAnchor),
            cx_title.topAnchor.constraint(equalTo: cx_wrap.topAnchor, constant: 16),
            
            cx_hint.leadingAnchor.constraint(equalTo: cx_title.leadingAnchor, constant: 0),
            cx_hint.topAnchor.constraint(equalTo: cx_title.bottomAnchor, constant: 8),
            
            cx_text.topAnchor.constraint(equalTo: cx_hint.bottomAnchor, constant: 8),
            cx_text.leadingAnchor.constraint(equalTo: cx_wrap.leadingAnchor, constant: 8),
            cx_text.trailingAnchor.constraint(equalTo: cx_wrap.trailingAnchor, constant: -8),
            cx_text.heightAnchor.constraint(equalToConstant: 150),
            cx_text.bottomAnchor.constraint(equalTo: cx_wrap.bottomAnchor),
        ])
        
        // 提交按钮
        NSLayoutConstraint.activate([
            mx_commit.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -50),
            mx_commit.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            mx_commit.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
            mx_commit.heightAnchor.constraint(equalToConstant: 50)
        ])
    }
    
    private func hookDelegates() {
        bx_text.delegate = self
        cx_text.delegate = self
    }
    
    private func installGestures() {
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(ax_hideKB))
        view.addGestureRecognizer(tapGesture)
    }
    
    @objc private func ax_hideKB() {
        view.endEditing(true)
    }
    
    @objc private func ax_back() {
        if presentingViewController != nil {
            dismiss(animated: true, completion: nil)
        } else {
            navigationController?.popViewController(animated: true)
        }
    }

}

// MARK: - TextView Delegate
extension VKWhistleBoardController: UITextViewDelegate {
    func textViewDidBeginEditing(_ textView: UITextView) {
        if textView.textColor == .lightGray {
            textView.text = nil
            textView.textColor = .black
        }
    }
    
    func textViewDidEndEditing(_ textView: UITextView) {
        if textView.text.isEmpty {
            textView.text = ""
            textView.textColor = .lightGray
        }
    }
}

// MARK: - TextField Delegate
extension VKWhistleBoardController: UITextFieldDelegate {
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
}

// Compatibility alias for legacy code
typealias FeedbackViewController = VKWhistleBoardController