//
//  LNSkillFieldPhotoEditView.swift
//  Gami
//
//  Created by OneeChan on 2026/1/21.
//

import Foundation
import UIKit
import SnapKit


class LNSkillFieldPhotoEditView: LNSkillFieldBaseEditView {
    private var maxCount = -1
    private let stackView = UIStackView()
    private let addImageButton = UIButton()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setupViews()
    }
    
    override func update(_ field: LNSkillEditField) {
        super.update(field)
        
        if let limit = field.validate.arraySize {
            maxCount = limit.max
        }
        
        if let urls = field.value as? [String] {
            for url in urls {
                let imageView = buildImageView()
                imageView.loadImage(url: url)
                stackView.addArrangedSubview(imageView)
                imageView.snp.makeConstraints { make in
                    make.height.equalToSuperview()
                    make.width.equalTo(imageView.snp.height)
                }
            }
            
            updateImageCount()
        }
    }
    
    required init(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

extension LNSkillFieldPhotoEditView: LNImageUploadViewDelegate {
    func onImageUploadView(view: LNImageUploadView, didUploadImage url: String) {
        guard let field else { return }
        let imageViews = stackView.arrangedSubviews.filter { $0 is LNImageUploadView } as! [LNImageUploadView]
        field.value = imageViews.compactMap({ $0.imageUrl })
        delegate?.onSkillFieldBaseEditViewInputChanged(view: self)
        
        needReview = true
    }
    
    func onImageUploadViewDidClickDelete(view: LNImageUploadView) {
        stackView.removeArrangedSubview(view)
        view.removeFromSuperview()
        
        guard let field else { return }
        let imageViews = stackView.arrangedSubviews.filter { $0 is LNImageUploadView } as! [LNImageUploadView]
        field.value = imageViews.compactMap({ $0.imageUrl })
        
        delegate?.onSkillFieldBaseEditViewInputChanged(view: self)
        updateImageCount()
        
        needReview = true
    }
}

extension LNSkillFieldPhotoEditView {
    private func updateImageCount() {
        guard maxCount > 0 else { return }
        let imageViews = stackView.arrangedSubviews.filter { $0 is LNImageUploadView }
        addImageButton.isHidden = imageViews.count >= maxCount
    }
    
    private func setupViews() {
        let scrollView = UIScrollView()
        scrollView.showsVerticalScrollIndicator = false
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.clipsToBounds = false
        container.addSubview(scrollView)
        scrollView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview()
            make.verticalEdges.equalToSuperview().inset(2)
            make.height.equalTo(90)
        }
        
        stackView.axis = .horizontal
        stackView.spacing = 6
        scrollView.addSubview(stackView)
        stackView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview()
            make.verticalEdges.equalToSuperview()
            make.height.equalToSuperview()
        }
        
        let config = UIImage.SymbolConfiguration(pointSize: 17, weight: .semibold)
        addImageButton.backgroundColor = .fill_2
        addImageButton.layer.cornerRadius = 9
        addImageButton.setImage(.init(systemName: "plus", withConfiguration: config), for: .normal)
        addImageButton.tintColor = .text_3
        addImageButton.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            LNBottomSheetMenu.showImageSelectMenu(view: self) { [weak self] image, _ in
                guard let self else { return }
                guard let image = image?.compress(type: .photoWall) else { return }
                let imageView = buildImageView()
                imageView.uploadImage(image: image)
                stackView.insertArrangedSubview(imageView, at: 1)
                imageView.snp.makeConstraints { make in
                    make.height.equalToSuperview()
                    make.width.equalTo(imageView.snp.height)
                }
                
                updateImageCount()
            }
        }), for: .touchUpInside)
        stackView.addArrangedSubview(addImageButton)
        addImageButton.snp.makeConstraints { make in
            make.height.equalToSuperview()
            make.width.equalTo(addImageButton.snp.height)
        }
    }
    
    private func buildImageView() -> LNImageUploadView {
        let imageView = LNImageUploadView()
        imageView.uploadType = .other   
        imageView.layer.cornerRadius = 9
        imageView.clipsToBounds = true
        imageView.showClearButton = true
        imageView.delegate = self
        
        return imageView
    }
}