102 lines
3.4 KiB
Swift
102 lines
3.4 KiB
Swift
import Foundation
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import SwiftUI
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/// 直播 ViewModel
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@MainActor
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class LiveViewModel: ObservableObject {
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/// 全部频道分组。
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@Published var channelGroups: [LiveChannelGroup] = []
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/// 当前选中分组索引。
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@Published var selectedGroupIndex: Int = 0
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/// 当前选中频道索引（相对于当前分组）。
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@Published var selectedChannelIndex: Int = 0
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/// 当前播放频道。
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@Published var currentChannel: LiveChannelItem?
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/// 当前频道节目单（预留）。
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@Published var epgList: [Epginfo] = []
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/// 加载状态（预留，便于后续接入远程 EPG）。
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@Published var isLoading = false
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/// 是否显示频道列表（预留给 TV 遥控交互）。
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@Published var showChannelList = false
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/// 加载直播频道
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func loadChannels() {
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self.channelGroups = ApiConfig.shared.liveChannelGroupList
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if let firstGroup = channelGroups.first, let firstChannel = firstGroup.channels.first {
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currentChannel = firstChannel
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}
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}
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/// 选择频道分组
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func selectGroup(_ index: Int) {
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guard index >= 0, index < channelGroups.count else { return }
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selectedGroupIndex = index
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selectedChannelIndex = 0
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if let first = channelGroups[index].channels.first {
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selectChannel(first)
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}
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}
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/// 选择频道
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func selectChannel(_ channel: LiveChannelItem) {
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currentChannel = channel
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loadEPG(for: channel)
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}
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/// 上一个频道
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func previousChannel() {
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guard !channelGroups.isEmpty else { return }
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if selectedChannelIndex > 0 {
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selectedChannelIndex -= 1
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} else if selectedGroupIndex > 0 {
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selectedGroupIndex -= 1
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selectedChannelIndex = channelGroups[selectedGroupIndex].channels.count - 1
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}
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if let ch = channelGroups[selectedGroupIndex].channels[safe: selectedChannelIndex] {
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selectChannel(ch)
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}
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}
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/// 下一个频道
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func nextChannel() {
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guard !channelGroups.isEmpty else { return }
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let group = channelGroups[selectedGroupIndex]
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if selectedChannelIndex < group.channels.count - 1 {
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selectedChannelIndex += 1
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} else if selectedGroupIndex < channelGroups.count - 1 {
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selectedGroupIndex += 1
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selectedChannelIndex = 0
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}
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if let ch = channelGroups[selectedGroupIndex].channels[safe: selectedChannelIndex] {
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selectChannel(ch)
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}
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}
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/// 切换线路
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func switchSource() {
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// `currentChannel` 为值类型，调用 mutating 方法会触发 @Published 重新发布。
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currentChannel?.nextSource()
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}
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/// 当前频道列表
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var currentChannels: [LiveChannelItem] {
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guard selectedGroupIndex < channelGroups.count else { return [] }
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return channelGroups[selectedGroupIndex].channels
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}
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/// 加载 EPG 节目单
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private func loadEPG(for channel: LiveChannelItem) {
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// 预留：后续可在此按频道名/频道 ID 请求远程 EPG。
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// 当前版本先清空，避免展示过期节目单。
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epgList = []
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}
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}
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// 安全数组下标访问
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extension Collection {
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/// 安全下标读取，越界时返回 `nil`。
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subscript(safe index: Index) -> Element? {
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indices.contains(index) ? self[index] : nil
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}
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}
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