import SwiftUI
import VoiceCatCore

struct UserListView: View {
    @Bindable var session: SessionState
    @State private var selectedUser: User?
    @State private var showPerUserTuning = false
    @State private var showBanUser = false
    @State private var showMoveUser = false
    @State private var showPermissions = false

    var body: some View {
        let channelUsers = session.currentChannelId == 0
            ? session.users
            : session.users.filter { $0.channelId == session.currentChannelId }

        List(channelUsers) { user in
            UserRowView(user: user, isSelf: user.id == session.selfUserId)
                .contextMenu {
                    userContextMenu(user: user)
                }
        }
        .listStyle(.plain)
        .overlay {
            if channelUsers.isEmpty {
                ContentUnavailableView(
                    "No Users",
                    systemImage: "person.slash",
                    description: Text(session.currentChannelId == 0 ? "Join a channel to see users." : "No one else here yet.")
                )
            }
        }
        .sheet(item: $selectedUser) { user in
            if showPerUserTuning {
                PerUserTuningView(user: user, session: session)
            } else if showBanUser {
                BanUserView(user: user, session: session)
            } else if showMoveUser {
                MoveUserView(user: user, session: session)
            } else if showPermissions {
                PermissionsView(user: user, session: session)
            }
        }
    }

    @ViewBuilder
    private func userContextMenu(user: User) -> some View {
        if user.id != session.selfUserId {
            Button {
                selectedUser = user
                showPerUserTuning = true
                showBanUser = false; showMoveUser = false; showPermissions = false
            } label: {
                Label("Volume / NR", systemImage: "speaker.wave.2")
            }
            if session.permissions.canKick || session.permissions.isAdmin {
                Divider()
                Button {
                    session.kickUser(user.id, reason: "")
                } label: {
                    Label("Kick", systemImage: "person.fill.xmark")
                }
                if session.permissions.canBan || session.permissions.isAdmin {
                    Button(role: .destructive) {
                        selectedUser = user
                        showBanUser = true
                        showPerUserTuning = false; showMoveUser = false; showPermissions = false
                    } label: {
                        Label("Ban…", systemImage: "nosign")
                    }
                }
            }
            if session.permissions.canMoveUsers || session.permissions.isAdmin {
                Button {
                    selectedUser = user
                    showMoveUser = true
                    showPerUserTuning = false; showBanUser = false; showPermissions = false
                } label: {
                    Label("Move to channel…", systemImage: "arrow.right.circle")
                }
            }
            if session.permissions.isAdmin {
                Divider()
                let muted = user.serverMuted
                Button {
                    session.setServerMute(user.id, muted: !muted, deafened: user.serverDeafened)
                } label: {
                    Label(muted ? "Unmute" : "Server Mute", systemImage: muted ? "mic" : "mic.slash")
                }
                Button {
                    selectedUser = user
                    showPermissions = true
                    showPerUserTuning = false; showBanUser = false; showMoveUser = false
                } label: {
                    Label("Permissions…", systemImage: "lock.shield")
                }
            }
        }
    }
}

private struct UserRowView: View {
    let user: User
    let isSelf: Bool

    var body: some View {
        HStack(spacing: 10) {
            Image(systemName: user.selfMicMuted || user.serverMuted ? "mic.slash.fill" : "mic.fill")
                .foregroundStyle(user.selfMicMuted || user.serverMuted ? .red : .green)
                .imageScale(.small)
                .accessibilityHidden(true)
            VStack(alignment: .leading, spacing: 1) {
                HStack(spacing: 4) {
                    Text(user.nickname)
                        .fontWeight(isSelf ? .semibold : .regular)
                    if isSelf {
                        Text("(you)")
                            .font(.caption2)
                            .foregroundStyle(.secondary)
                    }
                    if user.isGuest {
                        Text("guest")
                            .font(.caption2)
                            .foregroundStyle(.secondary)
                    }
                }
                if user.serverMuted || user.serverDeafened {
                    Text(user.serverDeafened ? "server deafened" : "server muted")
                        .font(.caption2)
                        .foregroundStyle(.orange)
                }
            }
            Spacer()
            if user.selfDeafened {
                Image(systemName: "headphones.slash")
                    .imageScale(.small)
                    .foregroundStyle(.secondary)
                    .accessibilityHidden(true)
            }
        }
        .accessibilityElement(children: .combine)
        .accessibilityLabel("\(user.nickname)\(isSelf ? ", you" : "")\(user.isGuest ? ", guest" : "")\(user.selfMicMuted ? ", muted" : "")\(user.serverMuted ? ", server muted" : "")")
    }
}