//
//  NotificationSettingsViewModel.swift
//  SodaLive
//
//  Created by klaus on 2023/08/10.
//

import Foundation
import Combine

final class NotificationSettingsViewModel: ObservableObject {
    
    private let userRepository = UserRepository()
    private var subscription = Set<AnyCancellable>()
    
    @Published var followingChannelLive = false {
        didSet {
            submit(live: followingChannelLive)
        }
    }
    @Published var followingChannelUploadContent = false {
        didSet {
            submit(uploadContent: followingChannelUploadContent)
        }
    }
    @Published var message = false {
        didSet {
            submit(message: message)
        }
    }
    
    @Published var errorMessage = ""
    @Published var isShowPopup = false
    @Published var isLoading = false
    
    func getMemberInfo() {
        isLoading = true
        
        userRepository.getMemberInfo()
            .sink { result in
                switch result {
                case .finished:
                    DEBUG_LOG("finish")
                case .failure(let error):
                    ERROR_LOG(error.localizedDescription)
                }
            } receiveValue: { [unowned self] response in
                let responseData = response.data
                
                do {
                    let jsonDecoder = JSONDecoder()
                    let decoded = try jsonDecoder.decode(ApiResponse<GetMemberInfoResponse>.self, from: responseData)
                    
                    if let data = decoded.data, decoded.success {
                        self.followingChannelLive = data.followingChannelLiveNotice ?? false
                        self.followingChannelUploadContent = data.followingChannelUploadContentNotice ?? false
                        self.message = data.messageNotice ?? false
                    } 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
                }
                
                self.isLoading = false
            }
            .store(in: &subscription)
    }
    
    func submit(live: Bool? = nil, uploadContent: Bool? = nil, message: Bool? = nil) {
        if !isLoading && (live != nil || uploadContent != nil || message != nil) {
            userRepository
                .updateNotificationSettings(live: live, uploadContent: uploadContent, message: message)
                .sink { result in
                    switch result {
                    case .finished:
                        DEBUG_LOG("finish")
                    case .failure(let error):
                        ERROR_LOG(error.localizedDescription)
                    }
                } receiveValue: { _ in
                }
                .store(in: &subscription)
        }
    }
}

final class NotificationReceiveSettingsViewModel: ObservableObject {

    private let userRepository = UserRepository()
    private let followRepository = FollowCreatorRepository()
    private var subscription = Set<AnyCancellable>()

    @Published var followingChannelLive = false {
        didSet {
            submit(live: followingChannelLive)
        }
    }

    @Published var followingChannelUploadContent = false {
        didSet {
            submit(uploadContent: followingChannelUploadContent)
        }
    }

    @Published var message = false {
        didSet {
            submit(message: message)
        }
    }

    @Published var isLoading = false
    @Published var errorMessage = ""
    @Published var isShowPopup = false
    @Published var creatorList = [GetCreatorFollowingAllListItem]()
    @Published var totalCount = 0

    private var page = 1
    private var isLast = false
    private let pageSize = 20
    private var isMemberInfoLoading = false
    private var isFollowLoading = false

    func initialize() {
        getMemberInfo()
        getFollowedCreatorAllList(reset: true)
    }

    func getFollowedCreatorAllList(reset: Bool = false) {
        if reset {
            page = 1
            isLast = false
            totalCount = 0
            creatorList.removeAll()
        }

        if isLast || isFollowLoading {
            return
        }

        isFollowLoading = true
        updateLoading()

        followRepository.getFollowedCreatorAllList(page: page, size: pageSize)
            .sink { [weak self] result in
                guard let self = self else { return }

                switch result {
                case .finished:
                    DEBUG_LOG("finish")

                case .failure(let error):
                    self.isFollowLoading = false
                    self.updateLoading()
                    ERROR_LOG(error.localizedDescription)
                    self.errorMessage = I18n.Common.commonError
                    self.isShowPopup = true
                }
            } receiveValue: { [weak self] response in
                guard let self = self else { return }

                self.isFollowLoading = false
                self.updateLoading()

                do {
                    let decoded = try JSONDecoder().decode(
                        ApiResponse<GetCreatorFollowingAllListResponse>.self,
                        from: response.data
                    )

                    if let data = decoded.data, decoded.success {
                        if self.page == 1 {
                            self.creatorList.removeAll()
                        }

                        self.totalCount = data.totalCount

                        if !data.items.isEmpty {
                            self.page += 1
                            self.creatorList.append(contentsOf: data.items)
                        } else {
                            self.isLast = true
                        }
                    } else {
                        if let message = decoded.message {
                            self.errorMessage = message
                        } else {
                            self.errorMessage = I18n.Common.commonError
                        }

                        self.isShowPopup = true
                    }
                } catch {
                    self.errorMessage = I18n.Common.commonError
                    self.isShowPopup = true
                }
            }
            .store(in: &subscription)
    }

    func creatorFollow(creatorId: Int, index: Int, follow: Bool = true, notify: Bool = true) {
        if index < 0 || index >= creatorList.count {
            return
        }

        isFollowLoading = true
        updateLoading()

        userRepository.creatorFollow(creatorId: creatorId, follow: follow, notify: notify)
            .sink { [weak self] result in
                guard let self = self else { return }

                switch result {
                case .finished:
                    DEBUG_LOG("finish")

                case .failure(let error):
                    self.isFollowLoading = false
                    self.updateLoading()
                    ERROR_LOG(error.localizedDescription)
                    self.errorMessage = I18n.Common.commonError
                    self.isShowPopup = true
                }
            } receiveValue: { [weak self] response in
                guard let self = self else { return }

                self.isFollowLoading = false
                self.updateLoading()

                do {
                    let decoded = try JSONDecoder().decode(ApiResponseWithoutData.self, from: response.data)

                    if decoded.success {
                        var creator = self.creatorList[index]
                        creator.isFollow = follow
                        creator.isNotify = notify
                        self.creatorList.remove(at: index)
                        self.creatorList.insert(creator, at: index)
                    } else {
                        if let message = decoded.message {
                            self.errorMessage = message
                        } else {
                            self.errorMessage = I18n.Common.commonError
                        }

                        self.isShowPopup = true
                    }
                } catch {
                    self.errorMessage = I18n.Common.commonError
                    self.isShowPopup = true
                }
            }
            .store(in: &subscription)
    }

    private func getMemberInfo() {
        isMemberInfoLoading = true
        updateLoading()

        userRepository.getMemberInfo()
            .sink { [weak self] result in
                guard let self = self else { return }

                switch result {
                case .finished:
                    DEBUG_LOG("finish")

                case .failure(let error):
                    self.isMemberInfoLoading = false
                    self.updateLoading()
                    ERROR_LOG(error.localizedDescription)
                }
            } receiveValue: { [weak self] response in
                guard let self = self else { return }

                self.isMemberInfoLoading = false
                self.updateLoading()

                do {
                    let decoded = try JSONDecoder().decode(ApiResponse<GetMemberInfoResponse>.self, from: response.data)

                    if let data = decoded.data, decoded.success {
                        self.followingChannelLive = data.followingChannelLiveNotice ?? false
                        self.followingChannelUploadContent = data.followingChannelUploadContentNotice ?? false
                        self.message = data.messageNotice ?? false
                    } else {
                        if let message = decoded.message {
                            self.errorMessage = message
                        } else {
                            self.errorMessage = I18n.Common.commonError
                        }

                        self.isShowPopup = true
                    }
                } catch {
                    self.errorMessage = I18n.Common.commonError
                    self.isShowPopup = true
                }
            }
            .store(in: &subscription)
    }

    private func submit(live: Bool? = nil, uploadContent: Bool? = nil, message: Bool? = nil) {
        if isMemberInfoLoading || (live == nil && uploadContent == nil && message == nil) {
            return
        }

        userRepository
            .updateNotificationSettings(live: live, uploadContent: uploadContent, message: message)
            .sink { result in
                switch result {
                case .finished:
                    DEBUG_LOG("finish")

                case .failure(let error):
                    ERROR_LOG(error.localizedDescription)
                }
            } receiveValue: { _ in
            }
            .store(in: &subscription)
    }

    private func updateLoading() {
        isLoading = isMemberInfoLoading || isFollowLoading
    }
}