using Api.Services;
using Microsoft.AspNetCore.Mvc;
using PageFetcher.Models;
using Swashbuckle.AspNetCore.Annotations;

namespace Api.Controllers;

/// <summary>
/// Handles page-fetch requests: navigates to the URL via Playwright and returns rendered HTML and extracted text.
/// </summary>
[ApiController]
[Route("api/page")]
public sealed class PageController : ControllerBase
{
    private readonly PageFetcherService _service;
    private readonly ILogger<PageController> _logger;

    public PageController(PageFetcherService service, ILogger<PageController> logger)
    {
        _service = service;
        _logger = logger;
    }

    /// <summary>
    /// Fetches a web page via headless Chromium.
    /// Returns rendered HTML and extracted plain text.
    /// </summary>
    [HttpPost("fetch")]
    [SwaggerOperation(Summary = "Fetch a web page", Description = "Navigates to the given URL using Playwright, returns rendered HTML and stripped plain text.")]
    [SwaggerResponse(StatusCodes.Status200OK, "Page fetched successfully", typeof(FetchPageResponse))]
    [SwaggerResponse(StatusCodes.Status400BadRequest, "Invalid or non-HTTP(S) URL")]
    public async Task<ActionResult<FetchPageResponse>> Fetch([FromBody] FetchPageRequest request, CancellationToken ct)
    {
        if (string.IsNullOrWhiteSpace(request.Url))
            return BadRequest(new { Error = "Url is required." });

        if (!Uri.TryCreate(request.Url, UriKind.Absolute, out var uri) ||
            (uri.Scheme != Uri.UriSchemeHttp && uri.Scheme != Uri.UriSchemeHttps))
            return BadRequest(new { Error = "Url must be an absolute HTTP or HTTPS URL." });

        _logger.LogInformation("Fetch request: {Url} | caller={Caller} | waitFor={WaitFor}",
            request.Url, request.CallerService, request.WaitFor);

        var result = await _service.FetchAsync(request, ct);
        return Ok(result);
    }
}