using MediatR;
using Microsoft.Extensions.Configuration;
using ReC.Application.Common;
using ReC.Application.Common.Dto;
using ReC.Application.Common.Exceptions;
using ReC.Application.OutResults.Commands;
using System.Text.Json;

namespace ReC.Application.RecActions.Commands;

public record InvokeRecActionCommand : IRequest
{
    public RecActionDto Action { get; set; } = null!;
}

public static class InvokeRecActionCommandExtensions
{
    public static InvokeRecActionCommand ToInvokeCommand(this RecActionDto dto) => new() { Action = dto };
}

public class InvokeRecActionCommandHandler(
    ISender sender,
    IHttpClientFactory clientFactory,
    IConfiguration? config = null
    ) : IRequestHandler<InvokeRecActionCommand>
{
    public async Task Handle(InvokeRecActionCommand request, CancellationToken cancel)
    {
        var action = request.Action;
        using var http = clientFactory.CreateClient();

        if (action.RestType is null)
            throw new DataIntegrityException(
                $"Rec action could not be invoked because the RestType value is null. " +
                $"ProfileId: {action.ProfileId}, " +
                $"Id: {action.Id}"
            );

        using var httpReq = action.RestType
            .ToHttpMethod()
            .ToHttpRequestMessage(action.EndpointUri);

        if(action.Body is not null)
        {
            using var reqBody = new StringContent(action.Body);
            httpReq.Content = reqBody;
        }

        if (action.Headers is not null)
            foreach (var header in action.Headers)
                httpReq.Headers.Add(header.Key, header.Value);

        using var response = await http.SendAsync(httpReq, cancel);
        var resBody = await response.Content.ReadAsStringAsync(cancel);
        var resHeaders = response.Headers.ToDictionary();

        await sender.Send(new CreateOutResCommand
        {
            ActionId = action.Id,
            Header = JsonSerializer.Serialize(resHeaders, options: new() { WriteIndented = false }),
            Body = resBody,
            AddedWho = config?["AddedWho"]
        }, cancel);
    }
}