//
//  FeedbackVC.swift
//  QuickLocation
//

import UIKit
import RxSwift
import RxCocoa


final class FeedbackVC: BaseViewController {

    private enum FeedbackCategory: String, CaseIterable {
        case feature = "功能问题"
        case suggestion = "优化建议"
        case other = "其他"
    }

    private struct FeedbackDraft {
        let category: FeedbackCategory
        let detail: String
        let images: [UIImage]
        let contact: String
    }

    private var rootView: FeedbackView!
    private var selectedCategory: FeedbackCategory = .feature
    private var selectedImages: [UIImage] = []
    private var pendingDraft: FeedbackDraft?
    private var isSubmitting = false

    override func loadView() {
        rootView = FeedbackView(frame: UIScreen.main.bounds)
        view = rootView
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        bind()
    }

    private func bind() {
        rootView.navView.onBackTapped = { [weak self] in
            guard self?.isSubmitting == false else { return }
            self?.navigationController?.popViewController(animated: true)
        }

        rootView.categoryButtons.forEach { button in
            button.addTarget(self, action: #selector(categoryTapped(_:)), for: .touchUpInside)
        }

        rootView.detailTextView.rx.text.orEmpty
            .subscribe(onNext: { [weak self] text in
                self?.handleDetailChange(text)
            })
            .disposed(by: disposeBag)

        rootView.contactTextField.rx.controlEvent(.editingDidEndOnExit)
            .subscribe(onNext: { [weak self] in
                self?.rootView.contactTextField.resignFirstResponder()
            })
            .disposed(by: disposeBag)

        rootView.onAddImage = { [weak self] in
            self?.showAlbum()
        }

        rootView.onDeleteImage = { [weak self] index in
            guard let self, self.selectedImages.indices.contains(index) else { return }
            self.selectedImages.remove(at: index)
            self.rootView.updateImages(self.selectedImages)
        }

        rootView.saveBtn.rx.tap
            .subscribe(onNext: { [weak self] in
                self?.submit()
            })
            .disposed(by: disposeBag)
    }

    @objc private func categoryTapped(_ sender: UIButton) {
        let categories = FeedbackCategory.allCases
        guard categories.indices.contains(sender.tag) else { return }
        let category = categories[sender.tag]
        selectedCategory = category
        rootView.updateCategory(selectedIndex: sender.tag)
    }

    private func handleDetailChange(_ text: String) {
        let limitedText = text.count > 200 ? String(text.prefix(200)) : text
        if limitedText != text {
            rootView.detailTextView.text = limitedText
            rootView.detailTextView.selectedRange = NSRange(location: limitedText.count, length: 0)
        }
        rootView.updateDetail(text: limitedText)
    }

    private func showAlbum() {
        let remainingCount = 3 - selectedImages.count
        guard remainingCount > 0, !isSubmitting else { return }
        let picker = PhotoPickerVC(maxCount: remainingCount)
        picker.onConfirm = { [weak self] images in
            guard let self else { return }
            self.selectedImages.append(contentsOf: images.prefix(remainingCount))
            self.selectedImages = Array(self.selectedImages.prefix(3))
            self.rootView.updateImages(self.selectedImages)
        }
        present(picker, animated: true)
    }

    private func submit() {
        guard !isSubmitting else { return }
        view.endEditing(true)

        let detail = (rootView.detailTextView.text ?? "")
            .trimmingCharacters(in: .whitespacesAndNewlines)
        guard !detail.isEmpty else {
            DLToast.show(text: "请补充详细问题或意见")
            return
        }

        pendingDraft = FeedbackDraft(
            category: selectedCategory,
            detail: detail,
            images: selectedImages,
            contact: rootView.contactTextField.text ?? ""
        )
        isSubmitting = true
        rootView.setSubmitting(true)

        let successView = FeedbackSuccessView()
        successView.show(in: view)
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) { [weak self, weak successView] in
            guard let self, let successView else { return }
            successView.dismiss {
                AppRouter.shared.popOrDismiss()
            }
        }
    }
}