using BankSampahApp.Models;
using Microsoft.AspNetCore.Mvc;

namespace BankSampahApp.Controllers.Main
{
    [Route("Main/[controller]/[action]")]
    public class DashboardController : Controller
    {
        public IActionResult Index()
        {
            var model = BuildDashboardChartModel();
            return View("~/Views/Main/Dashboard/Index.cshtml", model);
        }

        public IActionResult Bsu()
        {
            return View("~/Views/Main/Dashboard/Bsu.cshtml");
        }

        /// <summary>
        /// Dummy chart data agar view dapat menampilkan grafik tanpa ketergantungan pada API.
        /// </summary>
        private static DashboardChartViewModel BuildDashboardChartModel()
        {
            var monthLabels = new List<string>
            {
                "Januari", "Februari", "Maret", "April", "Mei", "Juni",
                "Juli", "Agustus", "September", "Oktober", "November", "Desember"
            };

            var baseDatasets = new Dictionary<string, List<int>>
            {
                ["BSI"] = new() { 520, 540, 560, 590, 620, 650, 680, 710, 740, 770, 800, 830 },
                ["BSU"] = new() { 610, 630, 640, 670, 690, 720, 760, 780, 810, 830, 860, 890 },
                ["Offtaker"] = new() { 1050, 1080, 1100, 1140, 1180, 1220, 1260, 1300, 1340, 1380, 1420, 1480 }
            };

            var years = Enumerable.Range(2020, 6).ToList();
            var firstYear = years.Min();
            var yearlyData = new Dictionary<int, DashboardChartPayload>();

            foreach (var year in years)
            {
                var offset = year - firstYear;
                var payload = new DashboardChartPayload
                {
                    Labels = new List<string>(monthLabels)
                };

                foreach (var dataset in baseDatasets)
                {
                    var random = new Random(HashCode.Combine(year, dataset.Key));
                    payload.Datasets.Add(new DashboardChartDataset
                    {
                        Label = dataset.Key,
                        Data = dataset.Value
                            .Select(baseValue =>
                            {
                                var variation = random.Next(-100, 120) + offset * 30;
                                return Math.Max(0, baseValue + variation);
                            })
                            .ToList()
                    });
                }

                yearlyData[year] = payload;
            }

            return new DashboardChartViewModel
            {
                YearlyData = yearlyData,
                SelectedYear = yearlyData.Keys.Max()
            };
        }
    }
}