using WxAgent.Core;

namespace WxAgent.Host;

internal static class RemoteCliCommands
{
    public static async Task<object> RunAsync(string[] args, CancellationToken cancellationToken)
    {
        if (args.Length < 3)
            throw Invalid("Remote commands require a group and action.");
        if (IsConfigurationCommand(args))
            throw Invalid("Windows Agent configuration is GUI-only; double-click WxAgent.Tray.exe and use 服务设置... .");
        var configPath = Path.GetFullPath(Required(args, "--config"));
        var group = args[1];
        var action = args[2];
        return (group, action) switch
        {
            ("auth", "show") => await AuthShowAsync(configPath, cancellationToken),
            ("probe", "run") => await ProbeAsync(configPath, cancellationToken),
            ("status", "show") => await StatusShowAsync(args, configPath, cancellationToken),
            ("reporting", "show") => await ReportingShowAsync(configPath, cancellationToken),
            _ => throw Invalid("Unknown remote command. Use: auth show, status show, probe run, reporting show.")
        };
    }

    private static async Task<object> AuthShowAsync(string path, CancellationToken cancellationToken)
    {
        var configuration = await RemoteNodeConfigurationStore.LoadAsync(path, cancellationToken);
        return new
        {
            config = path,
            remote = configuration.Remote.Redacted(),
            configured = configuration.Remote.IsConfigured,
            reportingConfigVersion = configuration.Reporting.ConfigVersion
        };
    }

    private static async Task<object> ProbeAsync(string path, CancellationToken cancellationToken)
    {
        var configuration = await RemoteNodeConfigurationStore.LoadAsync(path, cancellationToken);
        configuration.Remote.Validate();
        using var client = new RemoteControlClient(configuration.Remote);
        var accounts = configuration.Reporting.Accounts.Select(account => new RemoteAccountSummary(
            account.AccountId,
            string.Equals(account.AccountId, configuration.Remote.ActiveAccountId, StringComparison.Ordinal),
            account.Enabled,
            account.AllowedChats.Count(chat => chat.Type == ReportingChatType.Group && chat.Enabled && chat.IdentityVerified),
            account.AllowedChats.Count(chat => chat.Type == ReportingChatType.Private && chat.Enabled && chat.IdentityVerified))).ToArray();
        var registration = await client.RegisterAsync(new RemoteNodeRegistration(configuration.Remote.NodeId!, "cli", RemoteProtocol.Version,
            ["heartbeat", "poll-tasks", "send-text", "report-message"], configuration.Reporting.ConfigVersion, accounts), cancellationToken);
        var heartbeat = await client.HeartbeatAsync(new RemoteHeartbeat(configuration.Remote.NodeId!, "cli", RemoteProtocol.Version,
            RemoteNodeStatus.Online, false, false, false, configuration.Remote.ActiveAccountId, 0,
            configuration.Reporting.ConfigVersion, Guid.NewGuid().ToString("N")), cancellationToken);
        return new { status = "ok", node = registration.NodeId, authState = client.AuthState, heartbeat = heartbeat.Status };
    }

    private static async Task<object> StatusShowAsync(string[] args, string path, CancellationToken cancellationToken)
    {
        var configuration = await RemoteNodeConfigurationStore.LoadAsync(path, cancellationToken);
        var dataDirectory = Path.GetFullPath(Option(args, "--data-dir") ?? Path.GetDirectoryName(path) ?? AppContext.BaseDirectory);
        var eventQueue = new RemoteEventQueue(Path.Combine(dataDirectory, "remote-event-queue.json"));
        var ledger = new RemoteTaskLedger(Path.Combine(dataDirectory, "remote-task-ledger.json"));
        return new
        {
            config = path,
            remote = configuration.Remote.Redacted(),
            configured = configuration.Remote.IsConfigured,
            reporting = new { configuration.Reporting.Enabled, configuration.Reporting.ConfigVersion, pendingEvents = eventQueue.PendingCount },
            unreportedTaskResults = ledger.UnreportedResults().Count,
            audit = configuration.Audit.TakeLast(20)
        };
    }

    private static async Task<object> ReportingShowAsync(string path, CancellationToken cancellationToken)
    {
        var configuration = await RemoteNodeConfigurationStore.LoadAsync(path, cancellationToken);
        return new
        {
            config = path,
            enabled = configuration.Reporting.Enabled,
            configVersion = configuration.Reporting.ConfigVersion,
            accounts = configuration.Reporting.Accounts.Select(account => new
            {
                accountId = Mask(account.AccountId),
                account.Enabled,
                allowedGroupCount = account.AllowedChats.Count(chat => chat.Type == ReportingChatType.Group && chat.Enabled && chat.IdentityVerified),
                allowedPrivateCount = account.AllowedChats.Count(chat => chat.Type == ReportingChatType.Private && chat.Enabled && chat.IdentityVerified),
                unverifiedCount = account.AllowedChats.Count(chat => !chat.IdentityVerified)
            }),
            audit = configuration.Audit.TakeLast(20)
        };
    }

    private static bool IsConfigurationCommand(string[] args) => (args[1], args[2]) switch
    {
        ("auth", "set" or "clear") => true,
        ("reporting", "enable" or "disable" or "account-add" or "account-enable" or "account-disable" or "allow" or "deny") => true,
        _ => false
    };

    private static string Required(string[] args, string name) => Option(args, name) switch
    {
        { Length: > 0 } value => value,
        _ => throw Invalid($"Missing {name}.")
    };

    private static string? Option(string[] args, string name)
    {
        var index = Array.IndexOf(args, name);
        return index >= 0 && index + 1 < args.Length ? args[index + 1] : null;
    }

    private static bool Has(string[] args, string name) => args.Contains(name, StringComparer.Ordinal);

    private static string Mask(string value) => value.Length <= 8 ? "<masked>" : value[..4] + "…" + value[^4..];

    private static WxAgentException Invalid(string message) => new(WxAgentErrorCode.InvalidArgument, message);
}