//
//  BookkeepingAmountSheet.swift
//  VenusKitto
//
//  Created by Neoa on 2025/8/26.
//

import Foundation
import UIKit
// MARK: - BookkeepingAmountSheet: 记账输入弹窗（上图下字 + 数字键盘）
final class BookkeepingAmountSheet: UIView{

    // 外部交互
    var onDismiss: (() -> Void)?
    /// (分类名, 日期, 选中宠物, 备注, 金额字符串[带正负/小数])
    var onSave: ((String, Date, HomeViewController.PetSummary?, String, String) -> Void)?

    /// 让宿主控制选择日期（可用你项目里的 DatePickerSheetController）
    var onPickDate: ((_ current: Date, _ handler: @escaping (Date) -> Void) -> Void)?

    /// 让宿主控制选择宠物（ActionSheet/自定义弹窗都行）
    var onPickPet: ((_ handler: @escaping (HomeViewController.PetSummary) -> Void) -> Void)?

    // 内部状态
    private var categoryName: String = ""
    private var selectedDate: Date = Date()
    private var selectedPet: HomeViewController.PetSummary?
    private var amountText: String = "" { didSet { amountField.text = amountText } }

    // UI
    private let overlay = UIControl()
    private let sheet = UIView()
    private let handleBar = UIView()

    private let dateButton = UIButton(type: .system)
    private let petButton = UIControl()
    private let petAvatar = UIImageView()
    private let petNameLabel = UILabel()

    private let noteField = UITextField()
    private let amountField = UITextField()

    private let grid = UIStackView()

    // MARK: - LifeCycle
    override init(frame: CGRect) {
        super.init(frame: frame)
        buildUI()
        isHidden = true
    }
    required init?(coder: NSCoder) { fatalError() }

    // 对外：配置分类、当前宠物
    func configure(category: String, currentPet: HomeViewController.PetSummary?) {
        self.categoryName = category
        self.selectedPet = currentPet
        petNameLabel.text = currentPet?.name ?? "宠物名字"
        if let urlStr = currentPet?.avatar, let u = URL(string: urlStr) {
            // 简单加载头像（可替换为你的统一加载逻辑）
            URLSession.shared.dataTask(with: u) { data, _, _ in
                let img = data.flatMap { UIImage(data: $0) }
                DispatchQueue.main.async { self.petAvatar.image = img ?? UIImage(named: "peihead") }
            }.resume()
        } else {
            petAvatar.image = UIImage(named: "peihead")
        }
        dateButton.setTitle(format(selectedDate), for: .normal)
        noteField.text = ""
        amountText = ""
    }

    // 显示/隐藏
    func show() {
        isHidden = false
        overlay.alpha = 0
        sheet.alpha = 0
        sheet.transform = CGAffineTransform(translationX: 0, y: 24)
        layoutIfNeeded()
        UIView.animate(withDuration: 0.22) {
            self.overlay.alpha = 1
            self.sheet.alpha = 1
            self.sheet.transform = .identity
        }
    }
    @objc private func hide() {
        endEditing(true) // 收起键盘
        UIView.animate(withDuration: 0.2, animations: {
            self.overlay.alpha = 0
            self.sheet.alpha = 0
            self.sheet.transform = CGAffineTransform(translationX: 0, y: 16)
        }, completion: { _ in
            self.isHidden = true
            self.onDismiss?()
        })
    }

    // MARK: - UI
    private func buildUI() {
        backgroundColor = .clear

        // 遮罩
        overlay.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        overlay.addTarget(self, action: #selector(hide), for: .touchUpInside)
        addSubview(overlay)
        overlay.translatesAutoresizingMaskIntoConstraints = false

        // 底板
        sheet.backgroundColor = .white
        sheet.layer.cornerRadius = 16
        sheet.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
        sheet.layer.masksToBounds = true
        addSubview(sheet)
        sheet.translatesAutoresizingMaskIntoConstraints = false

        // 顶部小横条
        handleBar.backgroundColor = UIColor(hex: "#E9E5E1")
        handleBar.layer.cornerRadius = 2
        handleBar.translatesAutoresizingMaskIntoConstraints = false
        sheet.addSubview(handleBar)

        // 顶部：日期 & 宠物
        let topRow = UIStackView()
        topRow.axis = .horizontal
        topRow.spacing = 12
        topRow.distribution = .fillEqually
        topRow.translatesAutoresizingMaskIntoConstraints = false
        sheet.addSubview(topRow)

        // 日期按钮（黄底，左侧）
        dateButton.setTitleColor(.black, for: .normal)
        dateButton.titleLabel?.font = .systemFont(ofSize: 15, weight: .semibold)
        dateButton.backgroundColor = UIColor(hex: "#FFE059")
        dateButton.layer.cornerRadius = 10
        dateButton.contentEdgeInsets = .init(top: 0, left: 12, bottom: 0, right: 12)
        dateButton.heightAnchor.constraint(equalToConstant: 44).isActive = true
        dateButton.addTarget(self, action: #selector(tapDate), for: .touchUpInside)

        // 宠物选择（白底描边，右侧）
        let petContainer = UIView()
        petContainer.backgroundColor = UIColor(hex: "#FEFCF2")
        petContainer.layer.cornerRadius = 10
        petContainer.layer.borderWidth = 1
        petContainer.layer.borderColor = UIColor(hex: "#E9E5E1").cgColor
        petContainer.translatesAutoresizingMaskIntoConstraints = false

        petButton.translatesAutoresizingMaskIntoConstraints = false
        petContainer.addSubview(petButton)

        let petStack = UIStackView()
        petStack.axis = .horizontal
        petStack.alignment = .center
        petStack.spacing = 8
        petStack.translatesAutoresizingMaskIntoConstraints = false
        petContainer.addSubview(petStack)

        petAvatar.contentMode = .scaleAspectFill
        petAvatar.layer.cornerRadius = 14
        petAvatar.layer.masksToBounds = true
        petAvatar.widthAnchor.constraint(equalToConstant: 28).isActive = true
        petAvatar.heightAnchor.constraint(equalToConstant: 28).isActive = true

        petNameLabel.text = "宠物名字"
        petNameLabel.font = .systemFont(ofSize: 15)

        petStack.addArrangedSubview(petAvatar)
        petStack.addArrangedSubview(petNameLabel)
        NSLayoutConstraint.activate([
            petButton.topAnchor.constraint(equalTo: petContainer.topAnchor),
            petButton.bottomAnchor.constraint(equalTo: petContainer.bottomAnchor),
            petButton.leadingAnchor.constraint(equalTo: petContainer.leadingAnchor),
            petButton.trailingAnchor.constraint(equalTo: petContainer.trailingAnchor),

            petStack.centerYAnchor.constraint(equalTo: petContainer.centerYAnchor),
            petStack.leadingAnchor.constraint(equalTo: petContainer.leadingAnchor, constant: 12),
            petStack.trailingAnchor.constraint(lessThanOrEqualTo: petContainer.trailingAnchor, constant: -12),
            petContainer.heightAnchor.constraint(equalToConstant: 44)
        ])
        petButton.addTarget(self, action: #selector(tapPet), for: .touchUpInside)

        topRow.addArrangedSubview(dateButton)
        topRow.addArrangedSubview(petContainer)

        // 第二行：备注/金额
        let midRow = UIStackView()
        midRow.axis = .horizontal
        midRow.spacing = 12
        midRow.distribution = .fillEqually
        midRow.translatesAutoresizingMaskIntoConstraints = false
        sheet.addSubview(midRow)

        styleField(noteField, placeholder: "备注")
        noteField.returnKeyType = .done
        noteField.delegate = self
        noteField.inputAccessoryView = makeKeyboardToolbar() // 键盘上方“完成”按钮
        styleField(amountField, placeholder: "请输入金额")
        amountField.textAlignment = .center
        amountField.isUserInteractionEnabled = false // 交给数字键盘输入

        midRow.addArrangedSubview(noteField)
        midRow.addArrangedSubview(amountField)

        // 数字键盘 4×4
        grid.axis = .vertical
        grid.spacing = 12
        grid.translatesAutoresizingMaskIntoConstraints = false
        sheet.addSubview(grid)
        let rows: [[String]] = [
            ["1","2","3","C"],
            ["4","5","6","+"],
            ["7","8","9","-"],
            ["再记","0",".","保存"]
        ]
        for r in rows {
            let h = UIStackView()
            h.axis = .horizontal
            h.spacing = 12
            h.distribution = .fillEqually
            r.forEach { h.addArrangedSubview(makeKey($0)) }
            grid.addArrangedSubview(h)
        }
        
        // 点击任意空白处收起键盘（不影响其它控件点击）
        let tapDismiss = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
        tapDismiss.cancelsTouchesInView = false
        sheet.addGestureRecognizer(tapDismiss)

        // 约束
        NSLayoutConstraint.activate([
            overlay.topAnchor.constraint(equalTo: topAnchor),
            overlay.leadingAnchor.constraint(equalTo: leadingAnchor),
            overlay.trailingAnchor.constraint(equalTo: trailingAnchor),
            overlay.bottomAnchor.constraint(equalTo: bottomAnchor),

            sheet.leadingAnchor.constraint(equalTo: leadingAnchor),
            sheet.trailingAnchor.constraint(equalTo: trailingAnchor),
            sheet.bottomAnchor.constraint(equalTo: bottomAnchor),
//            sheet.heightAnchor.constraint(equalTo: heightAnchor, multiplier: (traitCollection.userInterfaceIdiom == .pad ? 0.30 : 0.44)),
            sheet.heightAnchor.constraint(equalToConstant: 421),

            handleBar.topAnchor.constraint(equalTo: sheet.topAnchor, constant: 8),
            handleBar.centerXAnchor.constraint(equalTo: sheet.centerXAnchor),
            handleBar.widthAnchor.constraint(equalToConstant: 44),
            handleBar.heightAnchor.constraint(equalToConstant: 4),

            topRow.topAnchor.constraint(equalTo: handleBar.bottomAnchor, constant: 16),
            topRow.leadingAnchor.constraint(equalTo: sheet.leadingAnchor, constant: 16),
            topRow.trailingAnchor.constraint(equalTo: sheet.trailingAnchor, constant: -16),

            midRow.topAnchor.constraint(equalTo: topRow.bottomAnchor, constant: 12),
            midRow.leadingAnchor.constraint(equalTo: topRow.leadingAnchor),
            midRow.trailingAnchor.constraint(equalTo: topRow.trailingAnchor),
            noteField.heightAnchor.constraint(equalToConstant: 44),
            amountField.heightAnchor.constraint(equalTo: noteField.heightAnchor),

            grid.topAnchor.constraint(equalTo: midRow.bottomAnchor, constant: 16),
            grid.leadingAnchor.constraint(equalTo: topRow.leadingAnchor),
            grid.trailingAnchor.constraint(equalTo: topRow.trailingAnchor),
            grid.bottomAnchor.constraint(equalTo: sheet.safeAreaLayoutGuide.bottomAnchor, constant: -12)
        ])
    }

    private func styleField(_ tf: UITextField, placeholder: String) {
        tf.placeholder = placeholder
        tf.font = .systemFont(ofSize: 15)
        tf.backgroundColor = UIColor(hex: "#FEFCF2")
        tf.layer.cornerRadius = 10
        tf.layer.borderWidth = 1
        tf.layer.borderColor = UIColor(hex: "#E9E5E1").cgColor
        tf.leftView = UIView(frame: .init(x: 0, y: 0, width: 12, height: 1))
        tf.leftViewMode = .always
        tf.heightAnchor.constraint(equalToConstant: 44).isActive = true
    }
    
    

    private func makeKey(_ title: String) -> UIView {
        let btn = UIButton(type: .system)
        btn.setTitle(title, for: .normal)
        btn.titleLabel?.font = .systemFont(ofSize: 18, weight: (title == "保存" ? .semibold : .regular))
        btn.layer.cornerRadius = 10
        btn.heightAnchor.constraint(equalToConstant: 48).isActive = true

        if title == "保存" || title == "再记" {
            btn.backgroundColor = (title == "保存") ? UIColor(hex: "#FFE059") : UIColor(hex: "#FFE059")
            btn.setTitleColor(.black, for: .normal)
        } else {
            btn.backgroundColor = UIColor(hex: "#FEFCF2")
            btn.setTitleColor(UIColor(hex: "#2B2B2B"), for: .normal)
            btn.layer.borderWidth = 1
            btn.layer.borderColor = UIColor(hex: "#E9E5E1").cgColor
        }
        btn.addTarget(self, action: #selector(tapKey(_:)), for: .touchUpInside)
        return btn
    }
    
    @objc private func dismissKeyboard() {
        endEditing(true)
    }

    private func makeKeyboardToolbar() -> UIToolbar {
        let bar = UIToolbar()
        bar.sizeToFit()
        let flex = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        let done = UIBarButtonItem(title: "完成", style: .done, target: self, action: #selector(dismissKeyboard))
        bar.items = [flex, done]
        return bar
    }

    // MARK: - Actions
    @objc private func tapDate() {
        onPickDate?(selectedDate) { [weak self] newDate in
            guard let self = self else { return }
            self.selectedDate = newDate
            self.dateButton.setTitle(self.format(newDate), for: .normal)
        }
    }

    @objc private func tapPet() {
        onPickPet? { [weak self] pet in
            guard let self = self else { return }
            self.selectedPet = pet
            self.petNameLabel.text = pet.name
            if let avatar = pet.avatar, let url = URL(string: avatar) {
                URLSession.shared.dataTask(with: url) { data, _, _ in
                    let img = data.flatMap { UIImage(data: $0) }
                    DispatchQueue.main.async { self.petAvatar.image = img ?? UIImage(named: "peihead") }
                }.resume()
            }
        }
    }

    @objc private func tapKey(_ sender: UIButton) {
        guard let t = sender.title(for: .normal) else { return }
        switch t {
        case "0"..."9":
            amountText.append(t)
        case ".":
            if !amountText.contains(".") { amountText.append(".") }
        case "C":
            if !amountText.isEmpty { amountText.removeLast() }
        case "+":
            if amountText.hasPrefix("-") { amountText.removeFirst() }
        case "-":
            if !amountText.hasPrefix("-"), !amountText.isEmpty { amountText = "-" + amountText }
        case "再记":
            onSave?(categoryName, selectedDate, selectedPet, noteField.text ?? "", amountText)
            noteField.text = ""
            amountText = ""
        case "保存":
            onSave?(categoryName, selectedDate, selectedPet, noteField.text ?? "", amountText)
            hide()
        default: break
        }
    }

    private func format(_ d: Date) -> String {
        let f = DateFormatter()
        f.locale = Locale(identifier: "zh_CN")
        f.dateFormat = "yyyy.MM.dd"
        return f.string(from: d)
    }
}

extension BookkeepingAmountSheet: UITextFieldDelegate {
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
}