using System.Collections.Concurrent;
using MeetingAssistant.Workflow;
using Microsoft.Extensions.Options;

namespace MeetingAssistant.MacOs;

public sealed class MacOsWorkflowRulesEditorSessions
{
    private readonly MacOsWorkflowRulesEditorSession defaultSession;
    private readonly ConcurrentDictionary<string, MacOsWorkflowRulesEditorSession> sessions = new(StringComparer.Ordinal);
    private readonly ConcurrentDictionary<string, MacOsAgentWindowRequest> windows = new(StringComparer.Ordinal);
    private readonly IWorkflowRulesEditorChatPipeline pipeline;
    private readonly string agentUrl;
    private readonly CancellationToken applicationStopping;
    private readonly ILogger<MacOsWorkflowRulesEditorSessions> logger;

    public MacOsWorkflowRulesEditorSessions(
        IWorkflowRulesEditorChatPipeline pipeline,
        IOptions<MeetingAssistantOptions> options,
        IHostApplicationLifetime applicationLifetime,
        ILogger<MacOsWorkflowRulesEditorSessions> logger)
    {
        this.pipeline = pipeline;
        this.logger = logger;
        applicationStopping = applicationLifetime.ApplicationStopping;
        agentUrl = $"{options.Value.Api.PublicBaseUrl.TrimEnd('/')}/diagnostics/settings-and-logs";
        defaultSession = CreateSession();
    }

    public bool TryGetSession(string? id, out MacOsWorkflowRulesEditorSession session)
    {
        if (string.IsNullOrEmpty(id))
        {
            session = defaultSession;
            return true;
        }
        return sessions.TryGetValue(id, out session!);
    }

    public IReadOnlyList<MacOsAgentWindowRequest> GetAgentWindows() =>
        applicationStopping.IsCancellationRequested ? [] : windows.Values.ToArray();

    public void OpenWithPrompt(string initialPrompt)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(initialPrompt);
        applicationStopping.ThrowIfCancellationRequested();
        var id = Guid.NewGuid().ToString("N");
        var session = CreateSession();
        sessions[id] = session;
        var task = session.SendAsync(initialPrompt, applicationStopping);
        windows[id] = new MacOsAgentWindowRequest(id, $"{agentUrl}?session={id}");
        _ = ObservePromptAsync(task, id);
    }

    private MacOsWorkflowRulesEditorSession CreateSession() =>
        new(new WorkflowRulesEditorChatViewModel(pipeline), applicationStopping);

    private async Task ObservePromptAsync(Task task, string id)
    {
        try
        {
            await task;
        }
        catch (OperationCanceledException) when (applicationStopping.IsCancellationRequested)
        {
        }
        catch (Exception exception)
        {
            logger.LogError(exception, "Could not start approved workflow conversation {SessionId}", id);
        }
    }
}

public sealed record MacOsAgentWindowRequest(string Id, string Url);