using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Luneraria.Core;
using NUnit.Framework;
using UnityEngine;
using UnityEngine.TestTools;

namespace Luneraria.View.Tests
{
    /// <summary>
    /// U2D vertical function test: complete bot matches visible in the Unity scene, before the full
    /// asset import. Match 1 (seed 2) runs from round 1 to the fall of an Ancient: lanes, towers
    /// fall, heroes fight, the grotto boss is won and deployed. Match 2 (seed 9) starts at round 21
    /// with the fixture of the golden scenario high_wave_21 (waves above 20). Both must end with the
    /// fingerprint of the plain core run. A camera director photographs the key moments
    /// (docs/port/screenshots/u2d/); results and frame times go to docs/port/logs/u2d/ (or the
    /// LUNE_EVIDENCE folder).
    /// </summary>
    public sealed class VerticalFunctionTests
    {
        const float Speed = 6f;

        sealed class Shot
        {
            public string Label;
            public Func<LuneMatchRunner, LuneMatchView, bool> Trigger;
            public Action<LuneMatchRunner, LuneMatchView, LuneCameraRig> Aim;
            public float Delay = .35f;
            public bool Done;
        }

        sealed class Stats
        {
            public int Frames;
            public double Seconds;
            public readonly List<double> FrameMs = new List<double>();
            public double AdvanceMs;
            public double SyncMs;
            public int Units;
        }

        [UnityTest]
        [Timeout(3600000)]
        public IEnumerator BotMatchesRunVisiblyAndMatchTheCore()
        {
            var report = new StringBuilder("{\n  \"runs\": [\n");
            var failures = new List<string>();
            yield return Play(2, 1, 0, "match-seed2", SeedTwoShots(), report, failures, false);
            report.Append(",\n");
            yield return Play(9, 21, 4000, "match-seed9-round21", WaveShots(), report, failures, true);
            report.Append("\n  ]\n}\n");
            string logs = PlayModeSupport.Evidence("logs", "u2d");
            Directory.CreateDirectory(logs);
            File.WriteAllText(Path.Combine(logs, "vertical-function-test.json"), report.ToString());
            Assert.IsEmpty(failures, string.Join("\n", failures));
        }

        static IEnumerator Play(int seed, int startRound, int extraGold, string label, List<Shot> shots, StringBuilder report, List<string> failures, bool measure)
        {
            var options = new MatchOptions { Seed = seed, HumanSlot = -1 };
            LuneTrace core = LuneTrace.RunCore(options, startRound, extraGold, "");
            QualitySettings.vSyncCount = 0;
            Application.targetFrameRate = 60;
            yield return PlayModeSupport.Load();
            var driver = UnityEngine.Object.FindAnyObjectByType<LuneMatchDriver>();
            var view = UnityEngine.Object.FindAnyObjectByType<LuneMatchView>();
            var rig = UnityEngine.Object.FindAnyObjectByType<LuneCameraRig>();
            Camera camera = Camera.main;
            rig.Interactive = false;
            driver.HumanSlot = -1;
            driver.Seed = seed;
            driver.StartRound = startRound;
            driver.ExtraGold = extraGold;
            driver.Speed = Speed;
            driver.Restart();
            LuneMatchRunner runner = driver.Runner;
            rig.Overview(true);
            var rounds = new List<string>();
            var events = new List<string>();
            int maxUnits = 0;
            int maxHeroes = 0;
            runner.Settled += settlement =>
            {
                rounds.Add(string.Format("{{\"round\": {0}, \"combat_seconds\": {1}, \"lost\": [{2}], \"boss\": \"{3}\", \"end\": \"{4}\"}}", settlement.Round,
                    PlayModeSupport.Number(settlement.CombatTime), string.Join(", ", settlement.BuildingsLost.Select(b => "\"" + b + "\"")), settlement.Boss, settlement.EndReason));
                foreach (string building in settlement.BuildingsLost)
                    events.Add(string.Format("\"round {0}: {1} destroyed\"", settlement.Round, building));
                if (settlement.Boss != "none")
                    events.Add(string.Format("\"round {0}: grotto boss {1}\"", settlement.Round, settlement.Boss));
            };
            var captures = new List<string>();
            Shot active = null;
            float activeSince = 0f;
            var stats = new Stats();
            bool measuring = false;
            float realStart = Time.realtimeSinceStartup;
            float overSince = -1f;
            while (Time.realtimeSinceStartup - realStart < 900f)
            {
                yield return null;
                LuneMatch match = runner.Match;
                if (match.Combat != null && runner.Current == LuneMatchRunner.Stage.Combat)
                {
                    maxUnits = Math.Max(maxUnits, match.Combat.Units.Count(u => u.IsMobile() && u.Alive));
                    maxHeroes = Math.Max(maxHeroes, match.Combat.Units.Count(u => u.Kind == "hero" && u.Alive));
                }
                // Frame times at normal game speed with the most units on the map (match 2, round 21).
                if (measure && runner.Current == LuneMatchRunner.Stage.Combat && match.RoundNumber == startRound)
                {
                    double elapsed = match.Combat.Elapsed;
                    if (!measuring && elapsed >= 10.0 && stats.Frames == 0)
                    {
                        measuring = true;
                        driver.Speed = 1f;
                        Application.targetFrameRate = -1;
                        rig.LookAt(new Vec2(0, 0), 64f, true);
                    }
                    if (measuring)
                    {
                        stats.Frames++;
                        stats.Seconds += Time.unscaledDeltaTime;
                        stats.FrameMs.Add(Time.unscaledDeltaTime * 1000.0);
                        stats.AdvanceMs += driver.LastAdvanceMs;
                        stats.SyncMs += view.LastSyncMs;
                        stats.Units = Math.Max(stats.Units, match.Combat.Units.Count(u => u.IsMobile() && u.Alive));
                        if (stats.Seconds >= 20.0)
                        {
                            measuring = false;
                            driver.Speed = Speed;
                            Application.targetFrameRate = 60;
                        }
                    }
                }
                if (measuring)
                    continue;
                if (active == null)
                {
                    active = shots.FirstOrDefault(s => !s.Done && s.Trigger(runner, view));
                    if (active != null)
                    {
                        rig.SetYaw(0f, true);
                        active.Aim(runner, view, rig);
                        activeSince = Time.realtimeSinceStartup;
                    }
                }
                else if (Time.realtimeSinceStartup - activeSince >= active.Delay)
                {
                    // Render directly: WaitForEndOfFrame never resumes in batch mode.
                    string file = Path.Combine(PlayModeSupport.Evidence("screenshots", "u2d"), active.Label + ".png");
                    LuneCapture.Render(camera, file);
                    captures.Add("\"" + active.Label + "\"");
                    Debug.Log("LUNE_U2D shot " + active.Label + " round " + runner.Match.RoundNumber + " " + runner.Current);
                    active.Done = true;
                    active = null;
                }
                if (runner.Current == LuneMatchRunner.Stage.Over)
                {
                    if (overSince < 0f)
                        overSince = Time.realtimeSinceStartup;
                    bool pending = shots.Any(s => !s.Done && s.Trigger(runner, view)) || active != null;
                    if (!pending && Time.realtimeSinceStartup - overSince > 3.5f)
                        break;
                    if (Time.realtimeSinceStartup - overSince > 12f)
                        break;
                }
            }
            LuneTrace trace = runner.Trace;
            bool same = runner.Current == LuneMatchRunner.Stage.Over && trace.Hash == core.Hash && trace.Steps == core.Steps;
            if (!same)
                failures.Add(label + ": fingerprint " + trace.Hash.ToString("X16") + " / core " + core.Hash.ToString("X16"));
            foreach (Shot shot in shots.Where(s => !s.Done))
                failures.Add(label + ": no shot " + shot.Label);
            double[] frameMs = stats.FrameMs.OrderBy(v => v).ToArray();
            string performance = stats.Frames == 0 ? "null" : string.Format("{{\"window\": \"20 s real time at 1x speed, unlimited frame rate, round {0}\", \"frames\": {1}, \"fps\": {2}, \"frame_ms_avg\": {3}, \"frame_ms_p95\": {4}, \"simulation_ms_per_frame\": {5}, \"views_ms_per_frame\": {6}, \"units_alive_max\": {7}}}",
                startRound, stats.Frames, PlayModeSupport.Number(stats.Frames / stats.Seconds), PlayModeSupport.Number(stats.Seconds * 1000.0 / stats.Frames),
                PlayModeSupport.Number(frameMs[(int)(frameMs.Length * .95)]), PlayModeSupport.Number(stats.AdvanceMs / stats.Frames), PlayModeSupport.Number(stats.SyncMs / stats.Frames), stats.Units);
            report.AppendFormat("    {{\"label\": \"{0}\", \"seed\": {1}, \"start_round\": {2}, \"extra_gold\": {3}, \"speed\": {4}, \"winner\": {5}, \"end_note\": \"{6}\", \"steps\": {7}, \"hash\": \"{8:X16}\", \"core_hash\": \"{9:X16}\", \"same_as_core\": {10},\n     \"units_alive_max\": {11}, \"heroes_alive_max\": {12}, \"boss_log\": [{13}],\n     \"rounds\": [{14}],\n     \"events\": [{15}],\n     \"shots\": [{16}],\n     \"performance\": {17}}}",
                label, seed, startRound, extraGold, Speed, runner.Match.Winner, runner.Match.EndNote, trace.Steps, trace.Hash, core.Hash, same ? "true" : "false",
                maxUnits, maxHeroes, string.Join(", ", runner.Match.BossLog.Select(e => string.Format("\"round {0}: {1} team {2} {3}\"", e.Round, e.Event, e.Team, e.Lane))),
                string.Join(", ", rounds), string.Join(", ", events), string.Join(", ", captures), performance);
            Application.targetFrameRate = -1;
        }

        static bool InCombat(LuneMatchRunner runner, int round, double from)
        {
            return runner.Current == LuneMatchRunner.Stage.Combat && runner.Match.RoundNumber == round && runner.Match.Combat.Elapsed >= from;
        }

        static LuneUnit Find(LuneMatchRunner runner, Func<LuneUnit, bool> predicate)
        {
            return runner.Match.Combat == null ? null : runner.Match.Combat.Units.FirstOrDefault(predicate);
        }

        static Shot Building(string label, Func<LuneMatchView, LuneBuildingView> pick, LuneBuildingView.Look look, float zoom, float delay)
        {
            LuneBuildingView chosen = null;
            return new Shot
            {
                Label = label,
                Delay = delay,
                Trigger = (runner, view) =>
                {
                    chosen = pick(view);
                    return chosen != null && chosen.Current == look;
                },
                Aim = (runner, view, rig) =>
                {
                    // Towers are watched from their lane (open ground), not through the forest.
                    Vec2 at = LuneSpace.Map(chosen.transform.position);
                    BuildingDef definition = runner.Match.Map.BuildingDef(chosen.BuildingId);
                    float yaw = 0f;
                    if (!chosen.IsAncient && definition.Tier != "base")
                        yaw = LuneCameraRig.YawTowards(at, runner.Match.Map.LanePoint(definition.Team, definition.Lane, definition.Progress));
                    rig.SetYaw(yaw, true);
                    rig.LookAt(at, zoom, true);
                },
            };
        }

        static List<Shot> SeedTwoShots()
        {
            string fallen = null;
            return new List<Shot>
            {
                new Shot { Label = "01-runde1-aufmarsch", Trigger = (r, v) => InCombat(r, 1, 9.0), Aim = (r, v, rig) => rig.LookAt(new Vec2(0, 0), 64f, true) },
                new Shot { Label = "02-runde1-mid-kampf", Trigger = (r, v) => InCombat(r, 1, 24.0), Aim = (r, v, rig) =>
                    {
                        LuneUnit fighter = Find(r, u => u.IsMobile() && u.Alive && u.Lane == "mid" && u.Target != null && u.InRange);
                        rig.LookAt(fighter != null ? fighter.Position : new Vec2(0, 0), 20f, true);
                    } },
                Building("03-turm-faellt", v => AnyBuilding(v, b => !b.IsAncient && b.Current == LuneBuildingView.Look.Destroying, ref fallen), LuneBuildingView.Look.Destroying, 22f, .7f),
                Building("04-turm-ruine", v => fallen != null ? v.Building(fallen) : null, LuneBuildingView.Look.Ruin, 22f, .4f),
                new Shot { Label = "05-grotte-bosskampf", Delay = .5f, Trigger = (r, v) => Find(r, u => u.Kind == "boss" && u.Zone == "grotto" && u.Alive && !u.Dormant) != null,
                    Aim = (r, v, rig) => rig.LookAt(LuneMap.Grotto, 20f, true) },
                new Shot { Label = "06-held-kaempft", Delay = .3f, Trigger = (r, v) => Find(r, u => u.Kind == "hero" && u.Alive && u.Zone == "lane" && u.Target != null && u.InRange) != null,
                    Aim = (r, v, rig) => rig.LookAt(Find(r, u => u.Kind == "hero" && u.Alive && u.Zone == "lane" && u.Target != null && u.InRange).Position, 16f, true) },
                new Shot { Label = "07-boss-auf-der-lane", Delay = .3f, Trigger = (r, v) => r.Current == LuneMatchRunner.Stage.Combat && r.Match.Combat.Elapsed > 12.0 && Find(r, u => u.Kind == "boss" && u.Zone == "lane" && u.Alive) != null,
                    Aim = (r, v, rig) => rig.LookAt(Find(r, u => u.Kind == "boss" && u.Zone == "lane" && u.Alive).Position, 22f, true) },
                Building("08-ancient-faellt", v => v.Building("blau_ancient"), LuneBuildingView.Look.Destroying, 30f, .8f),
                Building("09-ancient-ruine", v => v.Building("blau_ancient"), LuneBuildingView.Look.Ruin, 30f, .5f),
                new Shot { Label = "10-ende-uebersicht", Delay = .5f, Trigger = (r, v) => r.Current == LuneMatchRunner.Stage.Over && v.Building("blau_ancient").Current == LuneBuildingView.Look.Ruin,
                    Aim = (r, v, rig) => rig.Overview(true) },
            };
        }

        /// <summary>The first building that satisfies the condition; remembers its id.</summary>
        static LuneBuildingView AnyBuilding(LuneMatchView view, Func<LuneBuildingView, bool> condition, ref string remembered)
        {
            foreach (LuneBuildingView building in UnityEngine.Object.FindObjectsByType<LuneBuildingView>(FindObjectsSortMode.None).OrderBy(b => b.BuildingId, StringComparer.Ordinal))
            {
                if (condition(building))
                {
                    remembered = building.BuildingId;
                    return building;
                }
            }
            return null;
        }

        static List<Shot> WaveShots()
        {
            return new List<Shot>
            {
                new Shot { Label = "11-welle21-uebersicht", Trigger = (r, v) => InCombat(r, 21, 6.0), Aim = (r, v, rig) => rig.LookAt(new Vec2(0, 0), 70f, true) },
                new Shot { Label = "12-welle21-kampf", Trigger = (r, v) => InCombat(r, 21, 36.0), Aim = (r, v, rig) =>
                    {
                        LuneUnit fighter = Find(r, u => u.IsMobile() && u.Alive && u.Target != null && u.InRange && u.Zone == "lane");
                        rig.LookAt(fighter != null ? fighter.Position : new Vec2(0, 0), 24f, true);
                    } },
                Building("13-ancient-rot-faellt", v => v.Building("rot_ancient"), LuneBuildingView.Look.Destroying, 30f, .8f),
                new Shot { Label = "14-welle-ende", Delay = .6f, Trigger = (r, v) => r.Current == LuneMatchRunner.Stage.Over && v.Building("rot_ancient").Current == LuneBuildingView.Look.Ruin,
                    Aim = (r, v, rig) => rig.LookAt(r.Match.Map.CorePosition(1), 34f, true) },
            };
        }
    }
}