//
//  MessageCenterAPI.swift
//  suixinkan
//

import Foundation

/// 消息中心服务协议，抽象列表、已读和删除接口。
@MainActor
protocol MessageCenterServing {
    /// 拉取消息列表。
    func list(lastId: Int, limit: Int, unread: Int) async throws -> MessageListResponse

    /// 获取当前账号未读消息总数。
    func unreadCount() async throws -> MessageUnreadCountResponse

    /// 标记消息已读并返回最新未读数量。
    func markAsRead(messageId: Int) async throws -> MessageUnreadCountResponse

    /// 将当前账号全部消息标记已读。
    func markAllAsRead() async throws -> MessageReadAllResponse

    /// 删除消息。
    func delete(messageId: Int) async throws
}

/// 消息中心 API，对齐 Android `NetworkApi` 的 msg 区域。
@MainActor
final class MessageCenterAPI: MessageCenterServing {
    private let client: APIClient

    /// 初始化消息中心 API。
    init(client: APIClient) {
        self.client = client
    }

    /// GET /api/app/msg/list
    func list(lastId: Int = 0, limit: Int = 20, unread: Int = 0) async throws -> MessageListResponse {
        try await client.send(
            APIRequest(
                method: .get,
                path: "/api/app/msg/list",
                queryItems: [
                    URLQueryItem(name: "last_id", value: String(max(lastId, 0))),
                    URLQueryItem(name: "limit", value: String(max(limit, 1))),
                    URLQueryItem(name: "unread", value: String(max(unread, 0))),
                ]
            )
        )
    }

    /// GET /api/app/msg/unread-count
    func unreadCount() async throws -> MessageUnreadCountResponse {
        try await client.send(
            APIRequest(method: .get, path: "/api/app/msg/unread-count")
        )
    }

    /// POST /api/app/msg/read
    func markAsRead(messageId: Int) async throws -> MessageUnreadCountResponse {
        try await client.send(
            APIRequest(
                method: .post,
                path: "/api/app/msg/read",
                queryItems: [URLQueryItem(name: "id", value: String(messageId))]
            )
        )
    }

    /// POST /api/app/msg/read-all
    func markAllAsRead() async throws -> MessageReadAllResponse {
        try await client.send(
            APIRequest(method: .post, path: "/api/app/msg/read-all")
        )
    }

    /// POST /api/app/msg/delete
    func delete(messageId: Int) async throws {
        let _: EmptyPayload = try await client.send(
            APIRequest(
                method: .post,
                path: "/api/app/msg/delete",
                body: MessageDeleteRequest(id: messageId)
            )
        )
    }
}