//
//  LiveUIComponents.swift
//  suixinkan
//

import Kingfisher
import PhotosUI
import SnapKit
import UIKit

/// 直播 UI 格式化工具，集中处理 Android 页面使用的日期和时长文案。
enum LiveUIFormatter {
    /// 格式化直播时间范围。
    static func timeRange(start: Int64, end: Int64) -> String {
        guard start > 0 || end > 0 else { return "" }
        let startText = timestampText(start)
        let endText = timestampText(end)
        if startText.isEmpty { return endText }
        if endText.isEmpty { return startText }
        return "\(startText) - \(endText)"
    }

    /// 格式化秒级时长。
    static func duration(_ seconds: Int64) -> String {
        let value = max(seconds, 0)
        let hour = value / 3600
        let minute = (value % 3600) / 60
        let second = value % 60
        if hour > 0 {
            return String(format: "%02lld:%02lld:%02lld", hour, minute, second)
        }
        return String(format: "%02lld:%02lld", minute, second)
    }

    /// 格式化日期。
    static func date(_ date: Date?) -> String {
        guard let date else { return "" }
        return LiveAlbumListViewModel.dateString(date)
    }

    private static func timestampText(_ timestamp: Int64) -> String {
        guard timestamp > 0 else { return "" }
        let date = Date(timeIntervalSince1970: TimeInterval(timestamp))
        let formatter = DateFormatter()
        formatter.calendar = Calendar(identifier: .gregorian)
        formatter.locale = Locale(identifier: "zh_CN")
        formatter.dateFormat = "yyyy-MM-dd HH:mm"
        return formatter.string(from: date)
    }
}

/// 直播模块按钮，支持 Android 页面中的主按钮、暂停和危险操作色。
final class LiveActionButton: UIButton {
    enum Style {
        case primary
        case warning
        case danger
        case disabled
    }

    var buttonStyle: Style = .primary {
        didSet { updateAppearance() }
    }

    override var isEnabled: Bool {
        didSet { updateAppearance() }
    }

    /// 初始化直播操作按钮。
    init(title: String, image: UIImage? = nil) {
        super.init(frame: .zero)
        setTitle(title, for: .normal)
        setImage(image, for: .normal)
        titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        layer.cornerRadius = 8
        clipsToBounds = true
        tintColor = .white
        setConfigurationImagePlacement(.leading, padding: 4)
        updateAppearance()
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func updateAppearance() {
        let effectiveStyle: Style = isEnabled ? buttonStyle : .disabled
        switch effectiveStyle {
        case .primary:
            backgroundColor = UIColor(hex: 0x0066FF)
            setTitleColor(.white, for: .normal)
            tintColor = .white
        case .warning:
            backgroundColor = AppColor.warning
            setTitleColor(.white, for: .normal)
            tintColor = .white
        case .danger:
            backgroundColor = AppColor.danger
            setTitleColor(.white, for: .normal)
            tintColor = .white
        case .disabled:
            backgroundColor = AppColor.inputBackground
            setTitleColor(UIColor(hex: 0xB6BECA), for: .normal)
            tintColor = UIColor(hex: 0xB6BECA)
        }
    }
}

/// 直播模块封面视图，统一 Kingfisher 加载和占位展示。
final class LiveCoverImageView: UIImageView {
    /// 初始化封面图片视图。
    init(cornerRadius: CGFloat = 8) {
        super.init(frame: .zero)
        contentMode = .scaleAspectFill
        clipsToBounds = true
        backgroundColor = UIColor(hex: 0xF4F4F4)
        layer.cornerRadius = cornerRadius
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    /// 应用网络图片地址。
    func setURL(_ text: String) {
        if let url = URL(string: text), !text.isEmpty {
            kf.setImage(with: url, placeholder: placeholderImage())
        } else {
            image = placeholderImage()
        }
    }

    private func placeholderImage() -> UIImage? {
        UIImage(named: "img_square_loading_big") ?? UIImage(systemName: "photo")
    }
}

/// 虚线上传区域，复用直播封面和相册素材上传。
final class LiveDashedUploadView: UIControl {
    private let plusContainer = UIView()
    private let plusImageView = UIImageView(image: UIImage(systemName: "plus"))
    private let titleLabel = UILabel()
    private let subtitleLabel = UILabel()
    private var dashLayer: CAShapeLayer?

    /// 初始化虚线上传区域。
    init(title: String = "点击上传图片", subtitle: String? = nil) {
        super.init(frame: .zero)
        setup(title: title, subtitle: subtitle)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        dashLayer?.removeFromSuperlayer()
        let layer = CAShapeLayer()
        layer.strokeColor = AppColor.border.cgColor
        layer.fillColor = UIColor.clear.cgColor
        layer.lineWidth = 2
        layer.lineDashPattern = [6, 6]
        layer.path = UIBezierPath(roundedRect: bounds, cornerRadius: 8).cgPath
        self.layer.insertSublayer(layer, at: 0)
        dashLayer = layer
    }

    private func setup(title: String, subtitle: String?) {
        backgroundColor = .white
        plusContainer.backgroundColor = AppColor.primary
        plusContainer.layer.cornerRadius = 16
        plusImageView.tintColor = .white
        plusImageView.contentMode = .scaleAspectFit
        titleLabel.text = title
        titleLabel.font = .systemFont(ofSize: 14)
        titleLabel.textColor = subtitle == nil ? UIColor(hex: 0xB6BECA) : UIColor(hex: 0x4B5563)
        subtitleLabel.text = subtitle
        subtitleLabel.font = .systemFont(ofSize: 12)
        subtitleLabel.textColor = UIColor(hex: 0xB6BECA)
        subtitleLabel.textAlignment = .center

        addSubview(plusContainer)
        plusContainer.addSubview(plusImageView)
        addSubview(titleLabel)
        addSubview(subtitleLabel)

        plusContainer.snp.makeConstraints { make in
            make.centerX.equalToSuperview()
            make.centerY.equalToSuperview().offset(subtitle == nil ? -14 : -24)
            make.size.equalTo(32)
        }
        plusImageView.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.size.equalTo(18)
        }
        titleLabel.snp.makeConstraints { make in
            make.top.equalTo(plusContainer.snp.bottom).offset(12)
            make.centerX.equalToSuperview()
        }
        subtitleLabel.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(8)
            make.centerX.equalToSuperview()
        }
    }
}

/// 直播模块图片选择与上传数据加载工具。
enum LivePhotoPickerLoader {
    /// 从 PHPicker 结果加载图片数据。
    static func loadImage(from result: PHPickerResult) async throws -> LivePickedMedia {
        try await withCheckedThrowingContinuation { continuation in
            let provider = result.itemProvider
            guard provider.canLoadObject(ofClass: UIImage.self) else {
                continuation.resume(throwing: OSSUploadError.unsupportedFileType)
                return
            }
            provider.loadObject(ofClass: UIImage.self) { object, error in
                if let error {
                    continuation.resume(throwing: error)
                    return
                }
                guard let image = object as? UIImage, let data = image.jpegData(compressionQuality: 0.9) else {
                    continuation.resume(throwing: OSSUploadError.emptyFile)
                    return
                }
                continuation.resume(
                    returning: LivePickedMedia(
                        data: data,
                        fileName: "image_\(UUID().uuidString).jpg",
                        size: Int64(data.count),
                        width: Int(image.size.width),
                        height: Int(image.size.height)
                    )
                )
            }
        }
    }
}