// <copyright file="WeatherForecastController.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using Examples.AspNetCore.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace Examples.AspNetCore.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching",
        };

        private static readonly HttpClient HttpClient = new();

        private readonly ILogger<WeatherForecastController> logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            this.logger = logger ?? throw new ArgumentNullException(nameof(logger));
        }

        [HttpGet]
        public IEnumerable<WeatherForecast> Get()
        {
            using var scope = this.logger.BeginScope("{Id}", Guid.NewGuid().ToString("N"));

            // Making an http call here to serve as an example of
            // how dependency calls will be captured and treated
            // automatically as child of incoming request.
            var res = HttpClient.GetStringAsync("http://google.com").Result;
            var rng = new Random();
            var forecast = Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)],
            })
            .ToArray();

            this.logger.LogInformation(
                "WeatherForecasts generated {count}: {forecasts}",
                forecast.Length,
                forecast);

            return forecast;
        }
    }
}