e-party-iOS/yana/Features/FeedListFeature.swift

import Foundation
import ComposableArchitecture

@Reducer
struct FeedListFeature {
    @Dependency(\.apiService) var apiService
    struct State: Equatable {
        var feeds: [Feed] = [] // 预留 feed 内容
        var isLoading: Bool = false
        var error: String? = nil
        var isEditFeedPresented: Bool = false // 新增：控制 EditFeedView 弹窗
        // 新增：动态内容
        var moments: [MomentsInfo] = []
        // 新增：只加载一次标志
        var isLoaded: Bool = false
        // 分页相关
        var currentPage: Int = 1
        var hasMore: Bool = true
        var isLoadingMore: Bool = false
    }
    
    enum Action: Equatable {
        case onAppear
        case reload
        case loadMore
        case loadMoreResponse(TaskResult<MomentsLatestResponse>)
        case editFeedButtonTapped // 新增：点击 add 按钮
        case editFeedDismissed    // 新增：关闭编辑页
        // 新增：动态内容相关
        case fetchFeeds
        case fetchFeedsResponse(TaskResult<MomentsLatestResponse>)
        // 预留后续 Action
    }
    
    func reduce(into state: inout State, action: Action) -> Effect<Action> {
        switch action {
        case .onAppear:
            // 只在首次加载时请求 feed 数据
            guard !state.isLoaded else { return .none }
            state.isLoaded = true
            return .send(.fetchFeeds)
        case .reload:
            // 下拉刷新，重置状态并请求第一页
            state.isLoading = true
            state.error = nil
            state.currentPage = 1
            state.hasMore = true
            state.isLoaded = true
            return .run { [apiService] send in
                await send(.fetchFeedsResponse(TaskResult {
                    let request = LatestDynamicsRequest(dynamicId: "", pageSize: 20, types: [.text, .picture])
                    return try await apiService.request(request)
                }))
            }
        case .loadMore:
            // 上拉加载更多
            guard state.hasMore, !state.isLoadingMore, !state.isLoading else { return .none }
            state.isLoadingMore = true
            let lastDynamicId: String = {
                if let last = state.moments.last {
                    return String(last.dynamicId)
                } else {
                    return ""
                }
            }()
            return .run { [apiService] send in
                await send(.loadMoreResponse(TaskResult {
                    let request = LatestDynamicsRequest(dynamicId: lastDynamicId, pageSize: 20, types: [.text, .picture])
                    return try await apiService.request(request)
                }))
            }
        case let .loadMoreResponse(.success(response)):
            state.isLoadingMore = false
            if let list = response.data?.dynamicList {
                if list.isEmpty {
                    state.hasMore = false
                } else {
                    state.moments.append(contentsOf: list)
                    state.currentPage += 1
                    state.hasMore = (list.count >= 20)
                }
                state.error = nil
            } else {
                state.hasMore = false
                state.error = response.message
            }
            return .none
        case let .loadMoreResponse(.failure(error)):
            state.isLoadingMore = false
            state.hasMore = false
            state.error = error.localizedDescription
            return .none
        case .fetchFeeds:
            state.isLoading = true
            state.error = nil
            // 发起 API 请求
            return .run { [apiService] send in
                await send(.fetchFeedsResponse(TaskResult {
                    let request = LatestDynamicsRequest(dynamicId: "", pageSize: 20, types: [.text, .picture])
                    return try await apiService.request(request)
                }))
            }
        case let .fetchFeedsResponse(.success(response)):
            state.isLoading = false
            if let list = response.data?.dynamicList {
                state.moments = list
                state.error = nil
                state.currentPage = 1
                state.hasMore = (list.count >= 20)
            } else {
                state.moments = []
                state.error = response.message
                state.hasMore = false
            }
            return .none
        case let .fetchFeedsResponse(.failure(error)):
            state.isLoading = false
            state.moments = []
            state.error = error.localizedDescription
            state.hasMore = false
            return .none
        case .editFeedButtonTapped:
            state.isEditFeedPresented = true
            return .none
        case .editFeedDismissed:
            state.isEditFeedPresented = false
            return .none
        }
    }
}

// Feed 数据模型占位，后续可替换为真实模型
enum Feed: Equatable, Identifiable {
    case placeholder(id: UUID = UUID())
    var id: UUID {
        switch self {
        case .placeholder(let id): return id
        }
    }
}