using Back.Program.Common.Auth.Interface;
using Back.Program.Common.Data;
using Microsoft.EntityFrameworkCore;

namespace Back.Program.Common.Auth
{
    ///
    public class APIHeaderMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly string[] _headerNames;
        // private readonly IHeaderConfig _headerConfig;

        public APIHeaderMiddleware(RequestDelegate next, string[] headerNames) //, IHeaderConfig headerConfig)
        {
            _next = next;
            _headerNames = headerNames;
        }

        public async Task Invoke(HttpContext context)
        {
            if (context.Request.Path.Equals("/api/v1/in/app", StringComparison.OrdinalIgnoreCase))
            {
                await _next(context);
                return;
            }
            
            if (context.Request.Path.Value != null && context.Request.Path.Value.Contains("/out/"))
            {
                await _next(context);
                return;
            }
            

            // 정적 파일 요청은 미들웨어 건너뜀
            var path = context.Request.Path.Value;
            
            if (path != null && (path.StartsWith("/api")))
            {
                // Scoped 사용해서 값 가져오는 곳임
                var headerConfig = context.RequestServices.GetRequiredService<IHeaderConfig>();

                bool valid = false;

                foreach (var header in _headerNames)
                {
                    // context.Request.Headers.TryGetValue(header, out var headerValue)
                    // header 를 찾는데 header
                    if (context.Request.Headers.TryGetValue(header, out var headerValue) &&
                        !string.IsNullOrWhiteSpace(headerValue))
                    {
                        var keyName = await headerConfig.GetExpectedHeaderValueAsync(headerValue);
                        if (keyName != string.Empty)
                        {
                            valid = true;
                            break;
                        }
                    }
                }

                if (!valid)
                {
                    context.Response.StatusCode = StatusCodes.Status401Unauthorized;
                    await context.Response.WriteAsync($"Invalid header value");
                    return;
                }

                await _next(context);
                return;
            }

            await _next(context);
            
        }
    }
}