#if UNITY_EDITOR || DEVELOPMENT_BUILD
using System;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Linq;
using System.Text;
using ProjectI.Enemies;

namespace ProjectI.Debugging
{
    public static class EnemyDirectorDebugView
    {
        public sealed class Snapshot
        {
            public string Summary { get; }
            public ReadOnlyCollection<string> History { get; }
            public ReadOnlyCollection<string> GroupHistory { get; }
            internal Snapshot(string summary, string[] history, string[] groups)
            { Summary = summary; History = Array.AsReadOnly(history); GroupHistory = Array.AsReadOnly(groups); }
        }
        public static Snapshot Inactive { get; } = new Snapshot("No active director. Start the S2 arrival or S3 boss fixture in Shooter sandbox.", Array.Empty<string>(), Array.Empty<string>());
        public static Snapshot Capture(EnemyAdmissionLedger ledger, EnemySpawnScheduler scheduler, EncounterPhase phase, double now)
        {
            if (ledger == null || double.IsNaN(now) || double.IsInfinity(now)) return Inactive;
            var text = new StringBuilder();
            text.AppendLine($"{ledger.Profile.Id} · {phase} · generation {ledger.ProfileGeneration}");
            text.AppendLine($"Bank: {Number(ledger.AvailableCredit)} / {Number(ledger.Profile.BankCeiling)} credits");
            text.AppendLine($"Nonboss: {ledger.LiveCount} live + {ledger.PendingCount} pending / {ledger.Profile.AdmissionLimit} limit");
            if (!ledger.Active) text.AppendLine("Stopped · no further purchases or births.");
            else if (!ledger.BudgetActive) text.AppendLine("Awaiting boss entry · reinforcements paused.");
            else
            {
                var intent = scheduler?.Saving;
                if (intent == null) text.AppendLine("Saving: no active intent");
                else
                {
                    string target = string.Join(" + ", intent.Choice.Members.GroupBy(c => c.Id).Select(g => $"{g.Count()}× {g.Key}"));
                    text.AppendLine($"Saving: {Source(intent.Choice.Mode, intent.Choice.TemplateId)} · {target}");
                    text.AppendLine($"Target {Number(intent.Choice.TotalCost)} credits · need {Number(Math.Max(0, intent.Choice.TotalCost - ledger.AvailableCredit))} · "
                        + (now > intent.ExpiresAt ? "expired; awaiting next opportunity" : "expires in " + Seconds(intent.ExpiresAt, now)));
                }
                text.AppendLine(scheduler == null ? "Next purchase attempt: not scheduled" : $"Next purchase attempt: {Seconds(scheduler.NextOpportunityAt, now)}");
                if (scheduler != null && scheduler.PendingAdmissionId != 0 && ledger.TryGetAdmission(scheduler.PendingAdmissionId, out var pending) && pending.NextPendingSlot >= 0)
                    text.AppendLine($"Next pending-member placement attempt: {Seconds(scheduler.NextMemberAt, now)}");
                else text.AppendLine("Pending-member placement: none");
            }
            var rows = ledger.RecentBirths.Reverse().Select(b =>
                $"{Number(Math.Max(0, now - b.BornAt))} s ago · {b.EnemyName}{(b.Tier == EnemyDirectorTier.Elite ? " [Elite]" : "")} · #{b.AdmissionId}\n"
                + $"{(b.Origin == EnemyAdmissionOrigin.Purchase ? Source(b.SelectionMode.Value, b.TemplateId) + " · " + Number(b.Cost) + " cr · " + b.CardId : b.Origin == EnemyAdmissionOrigin.BossEntry ? "Boss entry · unpriced" : "Parent death · unpriced")} · {b.ProfileId}").ToArray();
            var groups = ledger.RecentBirthGroups.Select(group =>
            {
                var latest = group.OrderByDescending(b => b.BornAt).First();
                string members = string.Join(", ", group.GroupBy(b => (b.CardId, b.EnemyName, b.Tier))
                    .Select(g => $"{g.Count()}× {g.Key.EnemyName}{(g.Key.Tier == EnemyDirectorTier.Elite ? " [Elite]" : "")}"));
                string source = latest.Origin == EnemyAdmissionOrigin.Purchase ? Source(latest.SelectionMode.Value, latest.TemplateId)
                    : latest.Origin == EnemyAdmissionOrigin.BossEntry ? "Boss entry" : "Parent death";
                return $"{Number(Math.Max(0, now - latest.BornAt))} s ago · #{latest.AdmissionId} · {source}\n{members} · {latest.ProfileId}";
            }).ToArray();
            return new Snapshot(text.ToString().TrimEnd(), rows, groups);
        }
        private static string Source(EnemySelectionMode mode, string template) => mode == EnemySelectionMode.Template ? "Template: " + template : mode == EnemySelectionMode.Procedural ? "Procedural" : "Single";
        private static string Number(double value) => value.ToString("0.0", CultureInfo.InvariantCulture);
        private static string Seconds(double deadline, double now) => Number(Math.Max(0, deadline - now)) + " s";
    }
}
#endif