//
//  LNCreateOrderFromSkillListPanel.swift
//  Lanu
//
//  Created by OneeChan on 2025/12/2.
//

import Foundation
import UIKit
import SnapKit


class LNCreateOrderFromSkillListPanel: LNPopupView {
    private let skillListView = UIStackView()
    private let costLabel = UILabel()
    
    private let minusButton = UIButton()
    private let countLabel = UILabel()
    private let addButton = UIButton()
    
    private var curCount = 1 {
        didSet {
            countLabel.text = "\(curCount)"
            if curCount <= 1 {
                minusButton.isEnabled = false
            } else {
                minusButton.isEnabled = true
            }
            updatePrice()
        }
    }
    
    private var skillItemViews: [LNProfileOrderSkillItemView] = []
    private var curSelected: LNGameMateSkillVO? {
        didSet {
            skillItemViews.forEach {
                $0.isSelected = $0.cur?.id == curSelected?.id
            }
            updatePrice()
        }
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setupViews()
    }
    
    func update(_ skills: [LNGameMateSkillVO], selected: LNGameMateSkillVO?) {
        guard !skills.isEmpty else { return }
        skillListView.arrangedSubviews.forEach {
            skillListView.removeArrangedSubview($0)
            $0.removeFromSuperview()
        }
        
        skills.forEach { skill in
            let view = LNProfileOrderSkillItemView()
            view.update(skill)
            view.onTap { [weak self] in
                guard let self else { return }
                self.curSelected = skill
            }
            skillListView.addArrangedSubview(view)
            skillItemViews.append(view)
        }
        
        curSelected = selected ?? skills[0]
        curCount = 1
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

extension LNCreateOrderFromSkillListPanel {
    private func updatePrice() {
        guard let skill = curSelected else { return }
        let cost = skill.price * Double(curCount)
        
        if let discount = LNOrderManager.shared.discountFor(skill.price) {
            costLabel.text = (cost - (1 - discount) * skill.price).toDisplay
        } else {
            costLabel.text = cost.toDisplay
        }
    }
    
    private func setupViews() {
        let titleLabel = UILabel()
        titleLabel.font = .heading_h3
        titleLabel.textColor = .text_5
        titleLabel.textAlignment = .center
        titleLabel.text = .init(key: "A00291")
        container.addSubview(titleLabel)
        titleLabel.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.top.equalToSuperview().offset(28)
        }
        
        skillListView.axis = .vertical
        skillListView.spacing = 8
        container.addSubview(skillListView)
        skillListView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.top.equalTo(titleLabel.snp.bottom).offset(20)
        }
        
        let priceView = buildPriceView()
        container.addSubview(priceView)
        priceView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview()
            make.top.equalTo(skillListView.snp.bottom).offset(4)
        }
        
        let orderView = buildOrderButton()
        container.addSubview(orderView)
        orderView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview()
            make.top.equalTo(priceView.snp.bottom).offset(17)
            make.bottom.equalTo(commonBottomInset)
        }
    }
    
    private func buildPriceView() -> UIView {
        let container = UIView()
        container.snp.makeConstraints { make in
            make.height.equalTo(54)
        }
        
        let label = UILabel()
        label.text = .init(key: "A00122")
        label.font = .heading_h3
        label.textColor = .text_5
        container.addSubview(label)
        label.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalToSuperview().offset(20)
        }
        
        addButton.setTitle("+", for: .normal)
        addButton.setTitleColor(.text_4, for: .normal)
        addButton.setTitleColor(.text_2, for: .disabled)
        addButton.backgroundColor = .primary_1
        addButton.layer.cornerRadius = 12
        addButton.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            self.curCount += 1
        }), for: .touchUpInside)
        container.addSubview(addButton)
        addButton.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.trailing.equalToSuperview().offset(-20)
            make.width.height.equalTo(24)
        }
        
        countLabel.font = .body_m
        countLabel.textColor = .text_5
        container.addSubview(countLabel)
        countLabel.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.trailing.equalTo(addButton.snp.leading).offset(-10)
        }
        
        minusButton.setTitle("-", for: .normal)
        minusButton.setTitleColor(.text_4, for: .normal)
        minusButton.setTitleColor(.text_2, for: .disabled)
        minusButton.backgroundColor = .primary_1
        minusButton.layer.cornerRadius = 12
        minusButton.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            self.curCount -= 1
        }), for: .touchUpInside)
        container.addSubview(minusButton)
        minusButton.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.trailing.equalTo(countLabel.snp.leading).offset(-10)
            make.width.height.equalTo(24)
        }
        
        return container
    }
    
    private func buildOrderButton() -> UIView {
        let container = UIView()
        
        let buttonView = UIView()
        buttonView.backgroundColor = .init(hex: "#1789FF14")
        buttonView.layer.cornerRadius = 23.5
        container.addSubview(buttonView)
        buttonView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.verticalEdges.equalToSuperview()
            make.height.equalTo(47)
        }
        
        let orderButton = UIButton()
        orderButton.setBackgroundImage(.icSkillOrderLong, for: .normal)
        orderButton.setTitle(.init(key: "A00041"), for: .normal)
        orderButton.setTitleColor(.text_1, for: .normal)
        orderButton.titleLabel?.font = .heading_h3
        orderButton.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            guard let curSelected else { return }
            dismiss()
            showLoading()
            LNGameMateManager.shared.getSkillDetail(skillId: curSelected.id) { [weak self] detail in
                dismissLoading()
                guard let self else { return }
                guard let detail else { return }
                pushToCreateOrder(detail, count: curCount)
            }
        }), for: .touchUpInside)
        buttonView.addSubview(orderButton)
        orderButton.snp.makeConstraints { make in
            make.trailing.equalToSuperview()
            make.verticalEdges.equalToSuperview()
        }
        
        let descView = UIView()
        buttonView.addSubview(descView)
        descView.snp.makeConstraints { make in
            make.leading.verticalEdges.equalToSuperview()
            make.trailing.equalTo(orderButton.snp.leading)
        }
        
        let priceView = UIView()
        descView.addSubview(priceView)
        priceView.snp.makeConstraints { make in
            make.center.equalToSuperview()
        }
        
        let coin = UIImageView.coinImageView()
        priceView.addSubview(coin)
        coin.snp.makeConstraints { make in
            make.leading.centerY.equalToSuperview()
            make.width.height.equalTo(20)
        }
        
        costLabel.font = .heading_h2
        costLabel.textColor = .text_5
        priceView.addSubview(costLabel)
        costLabel.snp.makeConstraints { make in
            make.verticalEdges.trailing.equalToSuperview()
            make.leading.equalTo(coin.snp.trailing).offset(4)
        }
        
        return container
    }
}

private class LNProfileOrderSkillItemView: UIView {
    private let icon = UIImageView()
    private let nameLabel = UILabel()
    private let priceLabel = UILabel()
    private let discountView = LNNewbieDiscountView()
    
    var cur: LNGameMateSkillVO?
    
    var isSelected: Bool = false {
        didSet {
            if isSelected {
                layer.borderColor = UIColor.init(hex: "#1789FF").cgColor
                backgroundColor = .fill_5
            } else {
                layer.borderColor = UIColor.fill_4.cgColor
                backgroundColor = .clear
            }
        }
    }
    
    func update(_ skill: LNGameMateSkillVO) {
        icon.sd_setImage(with: URL(string: skill.icon))
        nameLabel.text = skill.name
        
        let text: String = .init(key: "A00040", skill.price.toDisplay, skill.unit)
        let attrStr = NSMutableAttributedString(string: text)
        let range = (text as NSString).range(of: "\(skill.price.toDisplay)")
        attrStr.addAttribute(.font, value: UIFont.heading_h4, range: range)
        priceLabel.attributedText = attrStr
        
        if let discount = LNOrderManager.shared.discountFor(skill.price) {
            discountView.isHidden = false
            discountView.update(1 - discount)
        } else {
            discountView.isHidden = true
        }
        
        cur = skill
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        layer.cornerRadius = 12
        layer.borderWidth = 1
        layer.borderColor = UIColor.fill_4.cgColor
        snp.makeConstraints { make in
            make.height.equalTo(52)
        }
        
        addSubview(icon)
        icon.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(14)
            make.centerY.equalToSuperview()
            make.width.height.equalTo(32)
        }
        
        priceLabel.font = .body_s
        priceLabel.textColor = .text_4
        priceLabel.setContentHuggingPriority(.defaultHigh, for: .horizontal)
        priceLabel.setContentCompressionResistancePriority(.defaultHigh, for: .horizontal)
        addSubview(priceLabel)
        priceLabel.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.trailing.equalToSuperview().offset(-15)
        }
        
        discountView.discountOnly = true
        addSubview(discountView)
        discountView.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.trailing.equalTo(priceLabel.snp.leading).offset(-8)
        }
        
        nameLabel.font = .heading_h4
        nameLabel.textColor = .text_5
        nameLabel.setContentHuggingPriority(.defaultLow, for: .horizontal)
        nameLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
        addSubview(nameLabel)
        nameLabel.snp.makeConstraints { make in
            make.leading.equalTo(icon.snp.trailing).offset(10)
            make.centerY.equalToSuperview()
            make.trailing.lessThanOrEqualTo(discountView.snp.leading).offset(-8)
        }
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

#if DEBUG

import SwiftUI

struct LNProfileOrderPanelPreview: UIViewRepresentable {
    func makeUIView(context: Context) -> some UIView {
        let container = UIView()
        container.backgroundColor = .lightGray
        
        let view = LNCreateOrderFromSkillListPanel()
        view.popup(container)
        
        return container
    }
    
    func updateUIView(_ uiView: UIViewType, context: Context) { }
}

#Preview(body: {
    LNProfileOrderPanelPreview()
})
#endif // DEBUG