//
//  PermissionApplyViews.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 权限申请页橙色横幅（跳转景区申请）。
final class PermissionApplyBannerView: UIView {

    var onApplyNewScenic: (() -> Void)?

    private let titleLabel = UILabel()
    private let applyButton = UIButton(type: .system)

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = AppColor.warningBackground

        titleLabel.text = "没有找到心仪的景区"
        titleLabel.font = .systemFont(ofSize: 14, weight: .medium)
        titleLabel.textColor = AppColor.warning

        applyButton.setTitle("申请平台开通新景区", for: .normal)
        applyButton.titleLabel?.font = .systemFont(ofSize: 14, weight: .medium)
        applyButton.setTitleColor(AppColor.warning, for: .normal)
        applyButton.addTarget(self, action: #selector(applyTapped), for: .touchUpInside)

        addSubview(titleLabel)
        addSubview(applyButton)
        titleLabel.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(16)
            make.centerY.equalToSuperview()
        }
        applyButton.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-16)
            make.centerY.equalToSuperview()
        }
        snp.makeConstraints { make in
            make.height.equalTo(44)
        }
    }

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

    @objc private func applyTapped() {
        onApplyNewScenic?()
    }
}

/// 表单字段选择行，对齐 Android `FormField` + Selector。
final class PermissionFormSelectorRow: UIView {

    var onTap: (() -> Void)?

    private let titleLabel = UILabel()
    private let tagLabel = UILabel()
    private let descriptionLabel = UILabel()
    private let valueLabel = UILabel()
    private let chevron = UIImageView(image: UIImage(systemName: "chevron.down"))

    init(title: String, tag: String, description: String, placeholder: String) {
        super.init(frame: .zero)
        titleLabel.text = title
        titleLabel.font = .systemFont(ofSize: 16, weight: .medium)
        titleLabel.textColor = AppColor.textPrimary

        tagLabel.text = tag
        tagLabel.font = .systemFont(ofSize: 12)
        tagLabel.textColor = AppColor.textTertiary
        tagLabel.textAlignment = .right

        descriptionLabel.text = description
        descriptionLabel.font = .systemFont(ofSize: 12)
        descriptionLabel.textColor = UIColor(hex: 0xB3B8C2)
        descriptionLabel.numberOfLines = 0

        valueLabel.text = placeholder
        valueLabel.font = .systemFont(ofSize: 14)
        valueLabel.textColor = UIColor(hex: 0xB3B8C2)

        chevron.tintColor = UIColor(hex: 0xB3B8C2)
        chevron.contentMode = .scaleAspectFit

        let tap = UITapGestureRecognizer(target: self, action: #selector(rowTapped))
        addGestureRecognizer(tap)

        addSubview(titleLabel)
        addSubview(tagLabel)
        addSubview(descriptionLabel)
        addSubview(valueLabel)
        addSubview(chevron)

        titleLabel.snp.makeConstraints { make in
            make.top.leading.equalToSuperview()
        }
        tagLabel.snp.makeConstraints { make in
            make.centerY.equalTo(titleLabel)
            make.trailing.equalToSuperview()
            make.leading.greaterThanOrEqualTo(titleLabel.snp.trailing).offset(8)
        }
        descriptionLabel.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(4)
            make.leading.trailing.equalToSuperview()
        }
        valueLabel.snp.makeConstraints { make in
            make.top.equalTo(descriptionLabel.snp.bottom).offset(8)
            make.leading.bottom.equalToSuperview()
            make.trailing.lessThanOrEqualTo(chevron.snp.leading).offset(-8)
        }
        chevron.snp.makeConstraints { make in
            make.trailing.equalToSuperview()
            make.centerY.equalTo(valueLabel)
            make.size.equalTo(14)
        }
    }

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

    func setValue(_ text: String, isPlaceholder: Bool) {
        valueLabel.text = text
        valueLabel.textColor = isPlaceholder ? UIColor(hex: 0xB3B8C2) : AppColor.textPrimary
    }

    @objc private func rowTapped() {
        onTap?()
    }
}

/// 已选景区标签容器。
final class PermissionSelectedTagsView: UIView {

    private let titleLabel = UILabel()
    private let stackView = UIStackView()

    override init(frame: CGRect) {
        super.init(frame: frame)
        titleLabel.font = .systemFont(ofSize: 16, weight: .medium)
        titleLabel.textColor = UIColor(hex: 0x111827)
        stackView.axis = .vertical
        stackView.spacing = 8
        addSubview(titleLabel)
        addSubview(stackView)
        titleLabel.snp.makeConstraints { make in
            make.top.leading.trailing.equalToSuperview()
        }
        stackView.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(8)
            make.leading.trailing.bottom.equalToSuperview()
        }
    }

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

    func apply(title: String, names: [String], onRemove: ((Int) -> Void)? = nil) {
        titleLabel.text = title
        stackView.arrangedSubviews.forEach { $0.removeFromSuperview() }
        guard !names.isEmpty else {
            isHidden = true
            return
        }
        isHidden = false
        let row = UIStackView()
        row.axis = .horizontal
        row.spacing = 8
        row.alignment = .leading
        names.enumerated().forEach { index, name in
            let chip = PermissionTagChip(title: name)
            if let onRemove {
                chip.onRemove = { onRemove(index) }
            }
            row.addArrangedSubview(chip)
        }
        stackView.addArrangedSubview(row)
    }
}

/// 标签 Chip。
final class PermissionTagChip: UIView {

    var onRemove: (() -> Void)?

    private let label = UILabel()
    private let removeButton = UIButton(type: .system)

    init(title: String, showsRemove: Bool = true) {
        super.init(frame: .zero)
        layer.cornerRadius = 4
        layer.borderWidth = 1
        layer.borderColor = AppColor.primary.cgColor
        backgroundColor = .white

        label.text = title
        label.font = .systemFont(ofSize: 14)
        label.textColor = AppColor.primary

        removeButton.setImage(UIImage(systemName: "xmark"), for: .normal)
        removeButton.tintColor = AppColor.primary
        removeButton.addTarget(self, action: #selector(removeTapped), for: .touchUpInside)
        removeButton.isHidden = !showsRemove

        addSubview(label)
        addSubview(removeButton)
        label.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(12)
            make.top.bottom.equalToSuperview().inset(8)
            if showsRemove {
                make.trailing.equalTo(removeButton.snp.leading).offset(-4)
            } else {
                make.trailing.equalToSuperview().offset(-12)
            }
        }
        removeButton.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-8)
            make.centerY.equalToSuperview()
            make.size.equalTo(20)
        }
    }

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

    @objc private func removeTapped() {
        onRemove?()
    }
}

/// 底部主按钮。
final class PermissionSubmitButton: UIButton {

    override init(frame: CGRect) {
        super.init(frame: frame)
        setTitle("提交审核", for: .normal)
        setTitleColor(.white, for: .normal)
        titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        backgroundColor = AppColor.primary
        layer.cornerRadius = 8
        snp.makeConstraints { make in
            make.height.equalTo(48)
        }
    }

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

    func setSubmitting(_ submitting: Bool) {
        isEnabled = !submitting
        alpha = submitting ? 0.6 : 1
        setTitle(submitting ? "提交中..." : "提交审核", for: .normal)
    }
}