using System.Text.Json;
using HotMap.Utils;

namespace HotMap.Services;

public record HeatMapItem(DateOnly Time, int Contributions);

public record HeatMapGroupByWeek(DateOnly Monday, List<HeatMapItem> Items);

public class HeatMapService(ILogger<HeatMapService> logger)
{
    private List<HeatMapGroupByWeek>? _cachedResult;

    public List<HeatMapGroupByWeek> GetItemsByWeek()
    {
        _cachedResult ??= CalculateByWeekItems();
        return _cachedResult;
    }

    private record HeatMapItemInner(long Timestamp, int Contributions)
    {
        public DateTimeOffset Time => DateTimeOffset.FromUnixTimeSeconds(Timestamp);
    }

    private List<HeatMapGroupByWeek> CalculateByWeekItems()
    {
        List<HeatMapItemInner>? items = JsonSerializer.Deserialize<List<HeatMapItemInner>>(Data,
            s_jsonSerializerOptions);

        if (items is null or { Count: 0 })
        {
            throw new InvalidOperationException("Failed to get heap map items.");
        }

        // The contribution is not grouped by day, so group them.
        IEnumerable<HeatMapItem> groupedItems = items
            .Select(i => (DateOnly.FromDateTime(i.Time.DateTime), i.Contributions))
            .GroupBy(pair => pair.Item1)
            .Select(group => new HeatMapItem(group.Key,
                group.Select(pair => pair.Contributions).Sum()));

        List<HeatMapGroupByWeek> result = new(52);

        // Consider the input data is in order.
        // Start should be one year ago.
        HeatMapGroupByWeek group = new(DateOnly.FromDateTime(DateTime.Now).AddDays(-365 - 7).GetMonday(), []);
        logger.LogInformation("Create new item group by week {}.", group.Monday);

        foreach ((DateOnly date, int contributions) in groupedItems)
        {
            DateOnly mondayOfItem = date.GetMonday();
            logger.LogInformation("Current date of item: {}, monday is {}", date, mondayOfItem);

            // If current item is in the same week of last item.
            if (mondayOfItem == group.Monday)
            {
                // Fill the spacing of empty days with 0 contribution.
                FillSpacing(group, date);

                group.Items.Add(new HeatMapItem(date, contributions));
                continue;
            }

            // Current time is in the next (or much more) week of last item.
            // Fill the spacing, including the last week inner spacing and outer spacing.
            while (group.Monday < mondayOfItem)
            {
                FillSpacing(group, date);
                result.Add(group);
                group = new HeatMapGroupByWeek(group.Monday.AddDays(7), []);
                logger.LogInformation("Create new item group by week {}.", group.Monday);
            }

            // Now, the inner spacing of one week.
            FillSpacing(group, date);
            group.Items.Add(new HeatMapItem(date, contributions));
        }

        // Not fill the last item and add directly.
        result.Add(group);

        return result;
    }

    private static void FillSpacing(HeatMapGroupByWeek groupByWeek, in DateOnly date)
    {
        if (groupByWeek.Monday == date)
        {
            return;
        }

        if (groupByWeek.Items.Count == 0)
        {
            groupByWeek.Items.Add(new HeatMapItem(groupByWeek.Monday, 0));
        }

        DateOnly lastDate = groupByWeek.Items.Last().Time;
        // The day in one week is 7, so th count of items of one week should not bigger than 7.
        while (groupByWeek.Items.Count < 7 && lastDate < date.AddDays(-1))
        {
            lastDate = lastDate.AddDays(1);
            groupByWeek.Items.Add(new HeatMapItem(lastDate, 0));
        }
    }

    private static readonly JsonSerializerOptions
        s_jsonSerializerOptions = new() { PropertyNameCaseInsensitive = true };

    private const string Data = """
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