//
//  LiveRoomCreateViewModel.swift
//  SodaLive
//
//  Created by klaus on 2023/08/14.
//

import UIKit
import Moya
import Combine

final class LiveRoomCreateViewModel: ObservableObject {
    enum TimeSettingMode: String {
        case NOW, RESERVATION
    }
    
    enum LiveRoomType: String, Codable {
        case OPEN, PRIVATE, SECRET
    }
    
    let prices = [0, 100, 300, 500, 1000, 2000]
    
    @Published var isLoading = false
    @Published var tags: [String] = []
    @Published var title: String = ""
    @Published var content: String = "" {
        didSet {
            if content.count > 1000 {
                content = String(content.prefix(1000))
            }
        }
    }
    
    @Published var coverImage: UIImage? = nil
    @Published var coverImageUrl: String? = nil
    @Published var numberOfPeople = ""
    @Published var timeSettingMode: TimeSettingMode = .NOW
    @Published var reservationDateString: String = Date().convertDateFormat(dateFormat: "yyyy.MM.dd")
    @Published var reservationTimeString: String = Date().convertDateFormat(dateFormat: "a hh : mm")
    
    @Published var roomType: LiveRoomType = .OPEN {
        didSet {
            if roomType == .SECRET {
                timeSettingMode = .NOW
            }
            
            if roomType != .PRIVATE {
                password = ""
            }
        }
    }
    @Published var password = "" {
        didSet {
            if password.count > 6 {
                password = String(password.prefix(6))
            }
        }
    }
    
    @Published var isAdult = false
    @Published var priceString = "0" {
        didSet {
            if priceString.count > 5 {
                priceString = String(priceString.prefix(5))
            } else {
                if let price = Int(priceString) {
                    self.price = price
                } else {
                    self.price = 0
                }
            }
        }
    }
    @Published var price = 0
    
    @Published var errorMessage = ""
    @Published var isShowPopup = false
    @Published var isShowGetRecentInfoButton = true
    
    private let repository = LiveRepository()
    private var subscription = Set<AnyCancellable>()
    
    var reservationDate = Date() {
        willSet {
            reservationDateString = newValue.convertDateFormat(dateFormat: "yyyy.MM.dd")
        }
    }
    
    var reservationTime = Date() {
        willSet {
            reservationTimeString = newValue.convertDateFormat(dateFormat: "a hh : mm")
        }
    }
    
    var coverImagePath: String? = nil
    
    let placeholder = "라이브 공지를 입력하세요"
    
    func getRecentInfo() {
        isLoading = true
        
        repository.getRecentRoomInfo()
            .sink { result in
                switch result {
                case .finished:
                    DEBUG_LOG("finish")
                case .failure(let error):
                    ERROR_LOG(error.localizedDescription)
                }
            } receiveValue: { [unowned self] response in
                self.isLoading = false
                let responseData = response.data
                
                DispatchQueue.global(qos: .background).async {
                    do {
                        let jsonDecoder = JSONDecoder()
                        let decoded = try jsonDecoder.decode(ApiResponse<GetRecentRoomInfoResponse>.self, from: responseData)
                        
                        if let data = decoded.data, decoded.success {
                            DispatchQueue.main.async {
                                self.title = data.title
                                self.content = data.notice
                                self.coverImageUrl = data.coverImageUrl
                                self.coverImagePath = data.coverImagePath
                                self.numberOfPeople = String(data.numberOfPeople)
                                
                                self.errorMessage = "최근데이터를 불러왔습니다."
                                self.isShowPopup = true
                                self.isShowGetRecentInfoButton = false
                            }
                        } else {
                            DispatchQueue.main.async {
                                if let message = decoded.message {
                                    self.errorMessage = message
                                } else {
                                    self.errorMessage = "최근데이터를 불러오지 못했습니다.\n다시 시도해 주세요."
                                }
                                
                                self.isShowPopup = true
                            }
                        }
                    } catch {
                        print(error)
                        DispatchQueue.main.async {
                            self.errorMessage = "최근데이터를 불러오지 못했습니다.\n다시 시도해 주세요."
                            self.isShowPopup = true
                        }
                    }
                }
            }
            .store(in: &subscription)
    }
    
    func createRoom(onSuccess: @escaping (CreateLiveRoomResponse) -> Void) {
        if !isLoading && validate() {
            isLoading = true
            
            var request = CreateLiveRoomRequest(
                title: title,
                content: content.trimmingCharacters(in: .whitespacesAndNewlines) != placeholder ? content : "",
                coverImageUrl: coverImagePath,
                tags: tags,
                numberOfPeople: Int(numberOfPeople)!,
                isAdult: isAdult,
                price: price,
                type: roomType,
                password: (roomType == .PRIVATE && !password.trimmingCharacters(in: .whitespaces).isEmpty) ? password : nil
            )
            
            if timeSettingMode == .RESERVATION && roomType != .SECRET {
                request.beginDateTimeString = "\(reservationDate.convertDateFormat(dateFormat: "yyyy-MM-dd")) \(reservationTime.convertDateFormat(dateFormat: "HH:mm"))"
            }
            
            var multipartData = [MultipartFormData]()
            
            let encoder = JSONEncoder()
            encoder.outputFormatting = .withoutEscapingSlashes
            let jsonData = try? encoder.encode(request)
            
            if let jsonData = jsonData {
                
                if let coverImage = coverImage, let imageData = coverImage.jpegData(compressionQuality: 0.8) {
                    multipartData.append(
                        MultipartFormData(
                            provider: .data(imageData),
                            name: "coverImage",
                            fileName: "\(UUID().uuidString)_\(Date().timeIntervalSince1970 * 1000).jpg",
                            mimeType: "image/*")
                    )
                }
                
                multipartData.append(MultipartFormData(provider: .data(jsonData), name: "request"))
                
                repository
                    .createRoom(parameters: multipartData)
                    .sink { result in
                        switch result {
                        case .finished:
                            DEBUG_LOG("finish")
                        case .failure(let error):
                            ERROR_LOG(error.localizedDescription)
                        }
                    } receiveValue: { response in
                        self.isLoading = false
                        let responseData = response.data
                        
                        do {
                            let jsonDecoder = JSONDecoder()
                            let decoded = try jsonDecoder.decode(ApiResponse<CreateLiveRoomResponse>.self, from: responseData)
                            
                            if let data = decoded.data, decoded.success {
                                onSuccess(data)
                            } else {
                                if let message = decoded.message {
                                    self.errorMessage = message
                                } else {
                                    self.errorMessage = "다시 시도해 주세요.\n계속 같은 문제가 발생할 경우 고객센터로 문의 주시기 바랍니다."
                                }
                                
                                self.isShowPopup = true
                            }
                        } catch {
                            self.errorMessage = "다시 시도해 주세요.\n계속 같은 문제가 발생할 경우 고객센터로 문의 주시기 바랍니다."
                            self.isShowPopup = true
                        }
                    }
                    .store(in: &subscription)
            } else {
                self.errorMessage = "라이브을 만들지 못했습니다.\n다시 시도해 주세요.\n계속 같은 문제가 발생할 경우 고객센터로 문의 주시기 바랍니다."
                self.isShowPopup = true
                self.isLoading = false
            }
        }
    }
    
    private func validate() -> Bool {
        if coverImage == nil && coverImagePath == nil {
            self.errorMessage = "커버이미지를 선택해주세요."
            self.isShowPopup = true
            return false
        }
        
        if title.trimmingCharacters(in: .whitespaces).isEmpty {
            self.errorMessage = "제목을 입력해 주세요."
            self.isShowPopup = true
            return false
        }
        
        let notice = content.trimmingCharacters(in: .whitespacesAndNewlines) != placeholder ? content : ""
        if notice.isEmpty && notice.count < 5 {
            self.errorMessage = "공지를 5자 이상 입력해주세요."
            self.isShowPopup = true
            return false
        }
        
        guard let numberOfPeople = Int(numberOfPeople), (numberOfPeople >= 3 && numberOfPeople <= 999) else {
            self.errorMessage = "인원을 3~999명 사이로 입력해주세요."
            self.isShowPopup = true
            return false
        }
        
        if roomType == .PRIVATE && (password.trimmingCharacters(in: .whitespaces).isEmpty || password.count != 6) {
            self.errorMessage = "방 입장 비밀번호 6자리를 입력해 주세요."
            self.isShowPopup = true
            return false
        }
        
        return true
    }
}