Lanu_iOS/Lanu/Views/Profile/Post/LNPostShareImageGenerator.swift

//
//  LNPostShareImageGenerator.swift
//  Lanu
//
//  Created by OneeChan on 2025/11/28.
//

import Foundation
import UIKit
import SnapKit


class LNPostShareImageGenerator {
    fileprivate let container = UIImageView()
    private let newsView = UIView()
    private let newsLabel = UILabel()
    
    private let nameLabel = UILabel()
    private let genderView = LNGenderView()
    private let starLabel = UILabel()
    
    private let postView = UIImageView()
    
    private let bioLabel = UILabel()
    
    private let skillsView = UIStackView()
    private let qrCodeView = UIImageView()
    
    init() {
        setupViews()
    }
    
    func setInfo() {
        nameLabel.text = myUserInfo.nickname
        genderView.update(myUserInfo.gender, myUserInfo.age)
        starLabel.text = "\(myUserInfo.star)"
        bioLabel.text = myUserInfo.intro
    }
    
    func setAlbum(image: UIImage) {
        postView.image = image
    }
    
    func setOrderInfo(desc: String?) {
        newsLabel.text = desc?.isEmpty == false ? desc : .init(key: "A00218")
    }
    
    func setSkills(skills: [LNGameMateSkillVO]) {
        skillsView.arrangedSubviews.forEach {
            skillsView.removeArrangedSubview($0)
            $0.removeFromSuperview()
        }
        
        skills.prefix(3).forEach {
            let itemView = LNPostShareSkillItemView()
            itemView.icon.sd_setImage(with: URL(string: $0.icon))
            itemView.nameLabel.text = $0.name
            skillsView.addArrangedSubview(itemView)
        }
    }
    
    func setShareQRCode(url: String) {
        qrCodeView.image = url.toQRCode(size: 88)
    }
    
    func generate() -> UIImage {
        let renderer = UIGraphicsImageRenderer(bounds: container.bounds)
        
        return renderer.image { _ in
            container.drawHierarchy(
                in: container.bounds,
                afterScreenUpdates: true
            )
        }
    }
}

extension LNPostShareImageGenerator {
    private func setupViews() {
        let image: UIImage = .icPostShare
        container.image = image
        container.frame = .init(x: 0, y: 0, width: image.size.width, height: image.size.height)
        
        let record = buildRecord()
        container.addSubview(record)
        record.snp.makeConstraints { make in
            make.leading.top.equalToSuperview()
            make.trailing.equalToSuperview()
        }
        
        let post = buildPost()
        container.addSubview(post)
        post.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.top.equalToSuperview().offset(59)
        }
        
        let album = buildSkillView()
        container.addSubview(album)
        album.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.bottom.equalToSuperview().offset(-152)
            make.height.equalTo(100)
        }
        
        container.addSubview(qrCodeView)
        qrCodeView.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-74)
            make.bottom.equalToSuperview().offset(-33)
        }
    }
    
    private func buildRecord() -> UIView {
        newsView.snp.makeConstraints { make in
            make.height.equalTo(32)
        }
        
        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = CGRect(origin: .zero, size: .init(width: self.container.bounds.size.width, height: 32))
        gradientLayer.colors = [UIColor.init(hex: "#E0FFED").cgColor, UIColor.init(hex: "#FFFFFF00").cgColor]
        gradientLayer.locations = [0, 1]
        gradientLayer.startPoint = .init(x: 0, y: 0)
        gradientLayer.endPoint = .init(x: 1, y: 0)
        newsView.layer.insertSublayer(gradientLayer, at: 0)
        
        let ic = UIImageView()
        ic.image = .icPostShareNew
        newsView.addSubview(ic)
        ic.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(13)
            make.centerY.equalToSuperview()
        }
        
        newsLabel.font = .body_xs
        newsLabel.textColor = .init(hex: "#466811")
        newsView.addSubview(newsLabel)
        newsLabel.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalTo(ic.snp.trailing).offset(6)
        }
        
        return newsView
    }
    
    private func buildPost() -> UIView {
        let container = UIView()
        
        let info = buildUserInfo()
        container.addSubview(info)
        info.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.top.equalToSuperview().offset(12)
        }
        
        postView.contentMode = .scaleAspectFill
        postView.layer.cornerRadius = 20
        postView.clipsToBounds = true
        container.addSubview(postView)
        postView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.top.equalToSuperview().offset(44)
            make.height.equalTo(postView.snp.width).multipliedBy(317.0/311.0)
        }
        
        bioLabel.font = .body_m
        bioLabel.textColor = .text_4
        bioLabel.numberOfLines = 3
        container.addSubview(bioLabel)
        bioLabel.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(22)
            make.top.equalTo(postView.snp.bottom).offset(14)
            make.bottom.equalToSuperview().offset(-20)
        }
        
        return container
    }
    
    private func buildUserInfo() -> UIView {
        let container = UIView()
        container.snp.makeConstraints { make in
            make.height.equalTo(22)
        }
        
        nameLabel.font = .heading_h2
        nameLabel.textColor = .text_5
        container.addSubview(nameLabel)
        nameLabel.snp.makeConstraints { make in
            make.leading.centerY.equalToSuperview()
        }
        
        container.addSubview(genderView)
        genderView.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalTo(nameLabel.snp.trailing).offset(4)
        }
        
        starLabel.font = .heading_h2
        starLabel.textColor = .text_5
        container.addSubview(starLabel)
        starLabel.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.trailing.equalToSuperview()
        }
        
        let star = LNStarScoreView()
        star.score = 1.0
        star.icSize = 18
        container.addSubview(star)
        star.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.trailing.equalTo(starLabel.snp.leading).offset(-4)
        }
        
        return container
    }
    
    private func buildSkillView() -> UIView {
        let container = UIView()
        
        skillsView.axis = .horizontal
        skillsView.spacing = 10
        container.addSubview(skillsView)
        skillsView.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(113)
            make.bottom.equalToSuperview().offset(-18)
        }
        
        let ic = UIImageView()
        ic.image = .icHomeTabSelected
        ic.alpha = 0.5
        container.addSubview(ic)
        ic.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(20)
            make.top.equalToSuperview().offset(31)
        }
        
        let tipsLabel = UILabel()
        tipsLabel.text = .init(key: "A00219")
        tipsLabel.font = .heading_h4
        tipsLabel.textColor = .text_5
        tipsLabel.numberOfLines = 0
        container.addSubview(tipsLabel)
        tipsLabel.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalToSuperview().offset(30)
            make.width.equalTo(60)
        }
        
        return container
    }
}

#if DEBUG

import SwiftUI

struct LNPostShareImagePreview: UIViewRepresentable {
    func makeUIView(context: Context) -> some UIView {
        let container = UIView()
        container.backgroundColor = .lightGray
        
        let generator = LNPostShareImageGenerator()
        container.addSubview(generator.container)
        generator.container.snp.makeConstraints { make in
            make.center.equalToSuperview()
        }
        
        return container
    }
    
    func updateUIView(_ uiView: UIViewType, context: Context) { }
}

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