namespace Aeshnidae.Trials;

/// <summary>
/// trials.json beside the dll, for the website: written (atomically) after every
/// recorded clear and every award, and on enable. Aeshnidae.Leaderboard writes its
/// leaderboard.json the same way and the VPS timer publish-leaderboard.sh copies
/// both into the web root - this file sits beside Leaderboard's rather than inside
/// it so neither mod has to know the other's shape.
///
///   generated, cooldownMinutes, nextAward (server-local), week (the current key)
///   trials[]: landblock, name, records[] (per tier: tier, name, seconds, time, kills, when),
///             top[] (best per character, any tier, fastest first), weekLeader (this week's)
///   awards[]: the most recent trophies (week, landblock, name, tier, seconds, time, claimed)
/// </summary>
public static class Feed
{
    public static string JsonPath => Path.Combine(Mod.ModPath, "trials.json");

    private static readonly JsonSerializerOptions JsonOptions = new() { WriteIndented = false };

    public static DateTime LastWriteUtc { get; private set; }

    public static void Write()
    {
        if (!Mod.Settings.WriteJson || !TrialDb.Ready)
            return;

        try
        {
            var s = Mod.Settings;
            var week = Weeks.KeyOf(DateTime.Now, s);
            var bests = TrialDb.ServerBests();

            var payload = new
            {
                generated = DateTime.UtcNow.ToString("O"),
                cooldownMinutes = s.CooldownMinutes,
                week,
                weekOf = Weeks.Describe(week, s),
                nextAward = Weeks.NextAward(DateTime.Now, s).ToString("yyyy-MM-dd HH:mm"),
                trials = Mod.Trials.OrderBy(kv => kv.Key).Select(kv =>
                {
                    var leader = TrialDb.WeekBest(week, kv.Key);
                    return new
                    {
                        landblock = $"{kv.Key:X4}",
                        name = Mod.TrialName(kv.Key),
                        records = bests.Where(r => r.Landblock == kv.Key).OrderBy(r => r.Tier)
                            .Select(r => new { tier = r.Tier, name = r.CharacterName, seconds = r.Seconds, time = r.Time, kills = r.Kills, when = r.FinishedAt.ToString("O") }),
                        top = TrialDb.Top(kv.Key, 10)
                            .Select((r, i) => new { rank = i + 1, name = r.CharacterName, tier = r.Tier, seconds = r.Seconds, time = r.Time, kills = r.Kills, when = r.FinishedAt.ToString("O") }),
                        weekLeader = leader is null ? null : new { name = leader.CharacterName, tier = leader.Tier, seconds = leader.Seconds, time = leader.Time },
                    };
                }),
                awards = TrialDb.RecentAwards(20).Select(a => new
                {
                    week = a.Week,
                    landblock = $"{a.Landblock:X4}",
                    trial = Mod.TrialName(a.Landblock),
                    name = a.CharacterName,
                    tier = a.Tier,
                    seconds = a.Seconds,
                    time = a.Time,
                    awarded = a.AwardedAt.ToString("O"),
                    claimed = a.ClaimedAt is not null,
                }),
            };

            var tmp = JsonPath + ".tmp";
            File.WriteAllText(tmp, JsonSerializer.Serialize(payload, JsonOptions));
            File.Move(tmp, JsonPath, overwrite: true);
            LastWriteUtc = DateTime.UtcNow;
        }
        catch (Exception ex)
        {
            ModManager.Log($"[{Mod.Name}] could not write {JsonPath}: {ex.Message}", ModManager.LogLevel.Warn);
        }
    }
}