//
//  ScenicApplicationViews.swift
//  suixinkan
//

import Kingfisher
import SnapKit
import UIKit

/// 温馨提示卡片，对齐 Android `WarmReminderCard`。
final class ScenicApplicationWarmReminderView: UIView {

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = AppColor.primaryBanner
        layer.cornerRadius = 8

        let titleLabel = UILabel()
        titleLabel.text = "温馨提示"
        titleLabel.font = .systemFont(ofSize: 16, weight: .bold)
        titleLabel.textColor = .white

        let bodyLabel = UILabel()
        bodyLabel.text = "如果你想入驻更多的景区,平台可以帮你跟景区官方谈合作,如果已经有的景区,只要你符合入驻的条件,即可入驻。"
        bodyLabel.font = .systemFont(ofSize: 14)
        bodyLabel.textColor = .white
        bodyLabel.numberOfLines = 0

        let stack = UIStackView(arrangedSubviews: [titleLabel, bodyLabel])
        stack.axis = .vertical
        stack.spacing = 8
        addSubview(stack)
        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(16)
        }
    }

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

/// 审核状态卡片，对齐 Android `ScenicApplicationAuditStatusCard`。
final class ScenicApplicationAuditStatusView: UIView {

    func apply(pending: ScenicApplicationPendingResponse) {
        subviews.forEach { $0.removeFromSuperview() }

        let statusLabel: String
        let textColor: UIColor
        let background: UIColor
        switch pending.status {
        case 1:
            statusLabel = "待审核"
            textColor = AppColor.warning
            background = AppColor.warningBackground
        case 2:
            statusLabel = "通过"
            textColor = AppColor.info
            background = AppColor.primaryLight
        case 3, 9:
            statusLabel = pending.status == 3 ? "拒绝" : "取消"
            textColor = AppColor.danger
            background = AppColor.dangerBackground
        default:
            statusLabel = "--"
            textColor = AppColor.warning
            background = AppColor.warningBackground
        }

        backgroundColor = background

        let stack = UIStackView()
        stack.axis = .vertical
        stack.spacing = 8

        stack.addArrangedSubview(makeRow(label: "审核状态", value: statusLabel, color: textColor))
        if pending.status == 2 {
            stack.addArrangedSubview(makeRow(label: "审核人", value: pending.auditedBy ?? "--", color: textColor))
            stack.addArrangedSubview(makeRow(label: "审核时间", value: pending.auditedAt ?? "--", color: textColor))
        }
        let note = pending.rejectReason ?? pending.auditNote ?? "--"
        stack.addArrangedSubview(makeRow(label: "备注", value: note.isEmpty ? "--" : note, color: textColor))

        addSubview(stack)
        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(UIEdgeInsets(top: 16, left: 20, bottom: 16, right: 20))
        }
    }

    private func makeRow(label: String, value: String, color: UIColor) -> UIView {
        let row = UIStackView()
        row.axis = .horizontal
        row.distribution = .equalSpacing

        let left = UILabel()
        left.text = label
        left.font = .systemFont(ofSize: 14)
        left.textColor = color

        let right = UILabel()
        right.text = value
        right.font = .systemFont(ofSize: 14)
        right.textColor = color
        right.textAlignment = .right
        right.numberOfLines = 0

        row.addArrangedSubview(left)
        row.addArrangedSubview(right)
        return row
    }
}

/// 表单字段标题 + 内容容器。
final class ScenicApplicationFormFieldView: UIView {

    private let titleLabel = UILabel()
    private let contentContainer = UIView()

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

        let stack = UIStackView(arrangedSubviews: [titleLabel, contentContainer])
        stack.axis = .vertical
        stack.spacing = 8
        addSubview(stack)
        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
    }

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

    func setContent(_ view: UIView) {
        contentContainer.subviews.forEach { $0.removeFromSuperview() }
        contentContainer.addSubview(view)
        view.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
    }

    func updateTitle(_ title: String) {
        titleLabel.text = title
    }
}

/// 省/市选择按钮。
final class ScenicApplicationLocationSelector: UIControl {

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

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .white
        layer.cornerRadius = 8
        layer.borderWidth = 1
        layer.borderColor = AppColor.border.cgColor

        valueLabel.font = .systemFont(ofSize: 14)
        valueLabel.textColor = AppColor.textTertiary
        valueLabel.text = "请选择"

        chevron.tintColor = AppColor.textTertiary
        chevron.contentMode = .scaleAspectFit

        addSubview(valueLabel)
        addSubview(chevron)
        valueLabel.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(12)
            make.centerY.equalToSuperview()
            make.trailing.lessThanOrEqualTo(chevron.snp.leading).offset(-8)
        }
        chevron.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-12)
            make.centerY.equalToSuperview()
            make.size.equalTo(16)
        }
        snp.makeConstraints { make in
            make.height.equalTo(44)
        }
    }

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

    func setValue(_ value: String?, placeholder: String) {
        if let value, !value.isEmpty {
            valueLabel.text = value
            valueLabel.textColor = AppColor.textPrimary
        } else {
            valueLabel.text = placeholder
            valueLabel.textColor = AppColor.textTertiary
        }
    }

    override var isEnabled: Bool {
        didSet {
            alpha = isEnabled ? 1 : 0.5
        }
    }
}

/// 合作类型单选项。
final class ScenicApplicationCooperationOptionView: UIControl {

    private let titleLabel = UILabel()

    override var isSelected: Bool {
        didSet { applyStyle() }
    }

    init(title: String) {
        super.init(frame: .zero)
        titleLabel.text = title
        titleLabel.font = .systemFont(ofSize: 14)
        titleLabel.numberOfLines = 0
        layer.cornerRadius = 8
        layer.borderWidth = 2

        addSubview(titleLabel)
        titleLabel.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(16)
        }
        applyStyle()
    }

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

    private func applyStyle() {
        if isSelected {
            backgroundColor = AppColor.primaryBanner
            titleLabel.textColor = .white
            layer.borderColor = UIColor.clear.cgColor
        } else {
            backgroundColor = .white
            titleLabel.textColor = AppColor.textSecondary
            layer.borderColor = AppColor.inputBackground.cgColor
        }
    }
}

/// 横向图片上传区域。
final class ScenicApplicationImageUploadView: UIView {

    var onAdd: (() -> Void)?
    var onDelete: ((Int) -> Void)?
    var onRetry: ((Int) -> Void)?

    private let scrollView = UIScrollView()
    private let stackView = UIStackView()

    override init(frame: CGRect) {
        super.init(frame: frame)
        stackView.axis = .horizontal
        stackView.spacing = 8
        stackView.alignment = .center
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.addSubview(stackView)
        addSubview(scrollView)

        scrollView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
            make.height.equalTo(80)
        }
        stackView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
            make.height.equalToSuperview()
        }
    }

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

    func apply(images: [ScenicApplicationImageItem], isReadOnly: Bool) {
        stackView.arrangedSubviews.forEach { $0.removeFromSuperview() }

        for (index, item) in images.enumerated() {
            let cell = ScenicApplicationImageCell()
            cell.apply(item: item, showDelete: !isReadOnly)
            cell.onDelete = { [weak self] in self?.onDelete?(index) }
            cell.onRetry = { [weak self] in self?.onRetry?(index) }
            stackView.addArrangedSubview(cell)
            cell.snp.makeConstraints { make in
                make.size.equalTo(80)
            }
        }

        if images.count < 20, !isReadOnly {
            let addButton = ScenicApplicationAddImageButton()
            addButton.addTarget(self, action: #selector(addTapped), for: .touchUpInside)
            stackView.addArrangedSubview(addButton)
            addButton.snp.makeConstraints { make in
                make.size.equalTo(80)
            }
        }
    }

    @objc private func addTapped() {
        onAdd?()
    }
}

private final class ScenicApplicationAddImageButton: UIControl {

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = AppColor.inputBackground
        layer.cornerRadius = 8

        let icon = UIImageView(image: UIImage(systemName: "plus"))
        icon.tintColor = UIColor(hex: 0xB6BECA)
        let label = UILabel()
        label.text = "点击上传"
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hex: 0xB6BECA)

        let stack = UIStackView(arrangedSubviews: [icon, label])
        stack.axis = .vertical
        stack.spacing = 4
        stack.alignment = .center
        stack.isUserInteractionEnabled = false
        addSubview(stack)
        stack.snp.makeConstraints { make in
            make.center.equalToSuperview()
        }
    }

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

private final class ScenicApplicationImageCell: UIView {

    var onDelete: (() -> Void)?
    var onRetry: (() -> Void)?

    private let imageView = UIImageView()
    private let progressView = UIProgressView(progressViewStyle: .default)
    private let deleteButton = UIButton(type: .system)
    private let retryButton = UIButton(type: .system)
    private let errorLabel = UILabel()

    override init(frame: CGRect) {
        super.init(frame: frame)
        layer.cornerRadius = 8
        clipsToBounds = true
        imageView.contentMode = .scaleAspectFill
        imageView.clipsToBounds = true

        deleteButton.setImage(UIImage(systemName: "xmark.circle.fill"), for: .normal)
        deleteButton.tintColor = .white
        deleteButton.addTarget(self, action: #selector(deleteTapped), for: .touchUpInside)

        retryButton.setTitle("重试", for: .normal)
        retryButton.titleLabel?.font = .systemFont(ofSize: 12)
        retryButton.setTitleColor(.white, for: .normal)
        retryButton.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        retryButton.layer.cornerRadius = 4
        retryButton.addTarget(self, action: #selector(retryTapped), for: .touchUpInside)
        retryButton.isHidden = true

        errorLabel.font = .systemFont(ofSize: 10)
        errorLabel.textColor = .white
        errorLabel.textAlignment = .center
        errorLabel.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        errorLabel.isHidden = true

        addSubview(imageView)
        addSubview(progressView)
        addSubview(errorLabel)
        addSubview(retryButton)
        addSubview(deleteButton)

        imageView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        progressView.snp.makeConstraints { make in
            make.leading.trailing.bottom.equalToSuperview().inset(4)
        }
        deleteButton.snp.makeConstraints { make in
            make.top.trailing.equalToSuperview().inset(2)
            make.size.equalTo(22)
        }
        retryButton.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.width.equalTo(44)
            make.height.equalTo(24)
        }
        errorLabel.snp.makeConstraints { make in
            make.leading.trailing.bottom.equalToSuperview()
            make.height.equalTo(18)
        }
    }

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

    func apply(item: ScenicApplicationImageItem, showDelete: Bool) {
        deleteButton.isHidden = !showDelete
        progressView.isHidden = !item.isUploading
        progressView.progress = Float(item.uploadProgress) / 100

        if let data = item.localData, let image = UIImage(data: data) {
            imageView.image = image
        } else if !item.remoteURL.isEmpty, let url = URL(string: item.remoteURL) {
            imageView.kf.setImage(with: url)
        } else {
            imageView.image = nil
        }

        if let error = item.errorMessage, !error.isEmpty {
            errorLabel.isHidden = false
            errorLabel.text = "失败"
            retryButton.isHidden = false
        } else {
            errorLabel.isHidden = true
            retryButton.isHidden = true
        }
    }

    @objc private func deleteTapped() {
        onDelete?()
    }

    @objc private func retryTapped() {
        onRetry?()
    }
}

/// 协议勾选行，对齐 Android `AgreementCheckbox`。
final class ScenicApplicationAgreementView: UIView {

    var onToggle: (() -> Void)?

    private let checkbox = UIButton(type: .custom)
    private var isChecked = false

    override init(frame: CGRect) {
        super.init(frame: frame)

        checkbox.setImage(UIImage(systemName: "square"), for: .normal)
        checkbox.setImage(UIImage(systemName: "checkmark.square.fill"), for: .selected)
        checkbox.tintColor = AppColor.primaryBanner
        checkbox.addTarget(self, action: #selector(toggleTapped), for: .touchUpInside)

        let prefix = UILabel()
        prefix.text = "已阅读并同意"
        prefix.font = .systemFont(ofSize: 14)
        prefix.textColor = AppColor.textSecondary

        let userNotice = UILabel()
        userNotice.text = "《用户须知》"
        userNotice.font = .systemFont(ofSize: 14)
        userNotice.textColor = AppColor.primaryBanner

        let middle = UILabel()
        middle.text = "与"
        middle.font = .systemFont(ofSize: 14)
        middle.textColor = AppColor.textSecondary

        let privacy = UILabel()
        privacy.text = "《隐私政策》"
        privacy.font = .systemFont(ofSize: 14)
        privacy.textColor = AppColor.primaryBanner

        let textStack = UIStackView(arrangedSubviews: [prefix, userNotice, middle, privacy])
        textStack.axis = .horizontal
        textStack.spacing = 2
        textStack.alignment = .center

        let row = UIStackView(arrangedSubviews: [checkbox, textStack])
        row.axis = .horizontal
        row.spacing = 2
        row.alignment = .center

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

        addSubview(row)
        row.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        checkbox.snp.makeConstraints { make in
            make.size.equalTo(24)
        }
    }

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

    func setChecked(_ checked: Bool) {
        isChecked = checked
        checkbox.isSelected = checked
    }

    @objc private func toggleTapped() {
        onToggle?()
    }
}

/// 底部确认提交按钮。
final class ScenicApplicationSubmitButton: UIButton {

    override init(frame: CGRect) {
        super.init(frame: frame)
        setTitle("确认提交", for: .normal)
        setTitleColor(.white, for: .normal)
        titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        backgroundColor = AppColor.primaryBanner
        layer.cornerRadius = 8
        snp.makeConstraints { make in
            make.height.equalTo(46)
        }
    }

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

    func apply(canSubmit: Bool, isSubmitting: Bool, isReadOnly: Bool) {
        let enabled = !isReadOnly && canSubmit && !isSubmitting
        isEnabled = enabled
        alpha = enabled ? 1 : 1
        backgroundColor = enabled ? AppColor.primaryBanner : UIColor(hex: 0xE0E0E0)
        setTitle(isSubmitting ? "提交中..." : "确认提交", for: .normal)
    }
}

/// 上传进度弹窗。
final class ScenicApplicationUploadProgressView: UIView {

    private let titleLabel = UILabel()
    private let progressView = UIProgressView(progressViewStyle: .default)

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = UIColor.black.withAlphaComponent(0.35)

        let card = UIView()
        card.backgroundColor = .white
        card.layer.cornerRadius = 12

        titleLabel.font = .systemFont(ofSize: 16, weight: .medium)
        titleLabel.textColor = AppColor.textPrimary
        titleLabel.textAlignment = .center

        progressView.progressTintColor = AppColor.primaryBanner

        let stack = UIStackView(arrangedSubviews: [titleLabel, progressView])
        stack.axis = .vertical
        stack.spacing = 16
        card.addSubview(stack)
        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(20)
        }

        addSubview(card)
        card.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.leading.trailing.equalToSuperview().inset(40)
        }
    }

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

    func apply(state: ScenicApplicationUploadDialogState?) {
        isHidden = state == nil
        guard let state else { return }
        titleLabel.text = state.title
        progressView.progress = Float(state.progress) / 100
    }
}

/// 带 placeholder 的多行输入框。
final class ScenicApplicationPlaceholderTextView: UITextView, UITextViewDelegate {

    private let placeholderLabel = UILabel()

    var placeholder: String {
        get { placeholderLabel.text ?? "" }
        set {
            placeholderLabel.text = newValue
            refreshPlaceholderVisibility()
        }
    }

    var onTextChange: ((String) -> Void)?

    override var text: String! {
        didSet { refreshPlaceholderVisibility() }
    }

    override var delegate: UITextViewDelegate? {
        get { super.delegate }
        set {
            // 始终由自身处理 placeholder，外部 delegate 通过 onTextChange 接收变更。
        }
    }

    init(placeholder: String) {
        super.init(frame: .zero, textContainer: nil)
        font = .systemFont(ofSize: 14)
        textColor = AppColor.textPrimary
        backgroundColor = .white
        layer.cornerRadius = 8
        layer.borderWidth = 1
        layer.borderColor = AppColor.border.cgColor
        textContainerInset = UIEdgeInsets(top: 10, left: 8, bottom: 10, right: 8)
        super.delegate = self

        placeholderLabel.text = placeholder
        placeholderLabel.font = font
        placeholderLabel.textColor = AppColor.textTertiary
        placeholderLabel.numberOfLines = 0
        addSubview(placeholderLabel)
        placeholderLabel.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(10)
            make.leading.equalToSuperview().offset(12)
            make.trailing.equalToSuperview().offset(-12)
        }
        snp.makeConstraints { make in
            make.height.equalTo(100)
        }
    }

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

    func textViewDidChange(_ textView: UITextView) {
        refreshPlaceholderVisibility()
        onTextChange?(textView.text ?? "")
    }

    private func refreshPlaceholderVisibility() {
        placeholderLabel.isHidden = !(text ?? "").isEmpty
    }
}

/// 带边框的输入框样式。
enum ScenicApplicationFieldStyle {
    static func makeTextField(placeholder: String) -> UITextField {
        let field = UITextField()
        field.placeholder = placeholder
        field.font = .systemFont(ofSize: 14)
        field.borderStyle = .none
        field.backgroundColor = .white
        field.layer.cornerRadius = 8
        field.layer.borderWidth = 1
        field.layer.borderColor = AppColor.border.cgColor
        field.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 12, height: 1))
        field.leftViewMode = .always
        field.snp.makeConstraints { make in
            make.height.equalTo(44)
        }
        return field
    }
}