using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Serilog;
using LCU.Api.Internal.FileOperations.Services;
using LCU.Library.Internal.FileOperationsModels.Models;
using LCU.Library.Internal.Exceptions;
using LCU.Library.Internal.FileOperationsModels.Models.HtmlToPdfModels;
using LCU.Api.Internal.FileOperations.Extensions;
using LCU.Api.Internal.FileOperations.Services.QueueServices;
using LCU.Api.Internal.FileOperations.Services.PdfServices;
namespace LCU.Api.Internal.FileOperations.Controllers;

[ApiController]
[Route("api/[controller]")]
public class PdfController : ControllerBase
{
    private readonly IQueueFileOperationsService _queueFileOperationsService;
    private readonly IPdfParserService _pdfParserService;
    private readonly IBatchPdfParserService _batchPdfParserService;
    private readonly IDirectFileService _directFileService;
    private readonly IHtmlToPdfService _htmlToPdfService;

    public PdfController(IQueueFileOperationsService queueFileOperationsService, 
                         IPdfParserService pdfParserService,
                         IBatchPdfParserService batchPdfParserService,
                         IDirectFileService directFileService,
                         IHtmlToPdfService htmlToPdfService)
    {
        _queueFileOperationsService = queueFileOperationsService;
        _batchPdfParserService = batchPdfParserService;
        _pdfParserService = pdfParserService;
        _directFileService = directFileService;
        _htmlToPdfService = htmlToPdfService;
    }

    [HttpPost("QueueBatchPdfParser")]
    [ProducesResponseType(202)]
    [ProducesResponseType(400)]
    [ProducesResponseType(500)]
    public async Task<IActionResult> QueueBatchPdfParser([FromBody] BatchParsePdfRequest request)
    {
        try
        {
            var requestResponse = _batchPdfParserService.IsRequestValid(request, new RequestResponse());
            if (!requestResponse.IsSuccessful)
            {
                return BadRequest($"Request is invalid. Response: {String.Join("\n ", requestResponse.MessageStack.ToArray())}");
            }

            await _queueFileOperationsService.QueueFileOperations(request, FileOperationType.BatchPdfParser);
            return Accepted();
        }
        catch (ServiceException exception)
        {
            return StatusCode(StatusCodes.Status500InternalServerError, exception.Message);
        }
        catch (Exception exception)
        {
            Log.Error(exception, "Unexpected Exception");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    /// <remarks>
    /// This will parse a PDF from a starting page to and a stopping page, save new pdf to RootPath, 
    /// and returns the PDF name. The PDF name will be set to ParsedPdfname or the default "{pdfParserRequest.PdfName}.{pdfParserRequest.StartingPage}.pdf".
    /// 
    /// Notes: 
    /// - Page numbers range from 1-x. 
    /// - If PDF exists it will automatically overwrite.
    /// - Original PDF can be open at the time of parsing.
    /// </remarks>
    /// <param name="pdfParserRequest"></param>
    /// <returns></returns>
    [HttpPost("ParsePdf")]
    [ProducesResponseType(200)]
    [ProducesResponseType(typeof(ParsePdfRequest), 400)]
    [ProducesResponseType(500)]
    public IActionResult ParsePdf([FromBody] ParsePdfRequest pdfParserRequest)
    {
        try
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState.GetErrorMessages());
            }

            var result = _pdfParserService.ParsePdf(pdfParserRequest);
            return Ok(result);
        }
        catch (ServiceException exception)
        {
            return StatusCode(StatusCodes.Status500InternalServerError, exception.Message);
        }
        catch (Exception exception)
        {
            Log.Error(exception, "Unexpected Exception");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpGet("GetPdfContent/{pdfPath}")]
    [ProducesResponseType(200)]
    [ProducesResponseType(400)]
    [ProducesResponseType(500)]
    public IActionResult GetPdfContent([FromRoute] string pdfPath)
    {
        if (string.IsNullOrWhiteSpace(pdfPath))
        {
            return BadRequest("PDF Path is required");
        }

        try
        {
            var result = _directFileService.GetFileBytes(pdfPath);
            return new FileContentResult(result, "application/pdf");
        }
        catch (ArgumentException ae)
        {
            Log.Error(ae, $"Request for bad PDF path {pdfPath}");
            return BadRequest("PDF path not found");
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Unexpected error retrieving PDF path {pdfPath}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    /// <remarks>
    /// ConvertHmtlToPdf will take the HtmlToPdfRequest and generate a HTML file filling in the tags with the supplied data.
    /// It will then utilize Chrome functionality to print a pdf and save it to a location. Finally converting to byte array and returning.
    /// 
    /// HtmlToPdfRequest:
    /// - HtmlTemplateFilePath: (REQUIRED) File Path of the main html template that the HTML file will start to build.
    /// - PdfName: (REQUIRED) What the PDF and HTML files will be called.
    /// - KeepHtmlFile: (Defaults = False) Mostly for testing purposes. If set to true it will keep the generated HTML file.
    /// - KeepPdfFile: (Defaults = False) Mostly for testing purposes. If set to true it will keep the generated PDF file
    /// - HtmlSaveFilePath: (REQUIRED) Location that the generated HTML file will be temporarily (KeepHtmlFile = false) stored.
    /// - PdfSaveFilePath: (REQUIRED) Location that the generated PDF file will be temporarily (KeepHtmlFile = false) stored.
    /// - BodyTagValues: Tags that will be filled in with supplied values.
    ///     - TagValues:
    ///         - Tag: (REQUIRED) Name of the tag in the HTML. In HTML should be surrounded by {}. This tag does not need {}.
    ///         - Value: (REQUIRED) Value in which will replace the {TagName}.
    /// - BodyValueCollections: List of ValueCollections that give us the ability to replace a tag that is associated with a HTML Template. The ValucollectionItems is 
    ///                         looped through to generate what will replace the tag. Common use case would be a list of items or a table of items.
    ///     - CollectionTag: (REQUIRED) Name of the tag in the HTML. In HTML should be surrounded by {}. This tag does not need {}.
    ///     - CollectionHtmlTemplateFilePath: (REQUIRED) File Path of the collections html template that the HTML file will start to build.
    ///     - ValueCollectionItems: List of ValueCollectionItems that can be looped through to help build out what the CollectionTag will be replaced with.
    ///                             ValueCollection has a nested ValueCollectionItems, giving the ability to create infinite amount of nested collections within collections.
    ///         - TagValues: List of TagValues
    ///         - ValueCollections: List of ValueCollections     
    ///
    /// Notes: 
    /// - In HTML templates tags should be surrounded by braces {TagName}. The request does not need the braces {}.
    /// - Any unused tags surrounded by braces will be removed at the end of the process.
    /// - Can use \\\\zeus\DataIntegrationsQA\\PDFCreation\\ folder to store templates, generated HTML files, and generated PDF
    ///     - \\\\zeus\DataIntegrationsQA\\PDFCreation\\Html_Templates
    ///     - \\\\zeus\DataIntegrationsQA\\PDFCreation\\Html_Drop
    ///     - \\\\zeus\DataIntegrationsQA\\PDFCreation\\PDF_Drop
    /// </remarks>
    [HttpPost("ConvertHtmlToPdf")]
    [ProducesResponseType(200)]
    [ProducesResponseType(400)]
    [ProducesResponseType(500)]
    public IActionResult ConvertHtmlToPdf([FromBody] HtmlToPdfRequest htmlToPdfRequest)
    {
        try
        {
            var result = _htmlToPdfService.ConvertHtmlToPdf(htmlToPdfRequest);
            return new FileContentResult(result, "application/pdf");
        }
        catch (ServiceException exception)
        {
            return StatusCode(StatusCodes.Status500InternalServerError, exception.Message);
        }
        catch (Exception exception)
        {
            Log.Error(exception, "Unexpected Exception");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }
}