using System;
using System.Collections.Generic;
using UnityEngine;

namespace TKS.OutGame
{
    /// <summary>
    /// 아웃게임 실행 상태 = 표(OutGameData) + 세이브(SaveData). 바꾸는 동작은 전부 여기를 거쳐 즉시 저장(Commit)한다.
    /// 전투 연결 = 출전 편성(BuildLineup → BattleManager.LineupProvider) · 결과 보상(OnBattleEnd) · 군량(TryPayEntry) · 월드맵 진행(SyncWorldProgress).
    /// </summary>
    public class OutGameSession
    {
        public static OutGameSession Current { get; private set; }

        public readonly OutGameData Db;
        public readonly BalanceConfig Cfg;
        public SaveData Save;
        public System.Random Rng = new System.Random(Environment.TickCount);
        public Func<DateTime> Clock = () => DateTime.UtcNow;
        public StageReward LastReward;
        public bool IsNewUser { get; private set; }
        /// <summary>마지막 연무장 결과(PD #1093 C).</summary>
        public ModeResult LastMode;
        int lastGold;

        public event Action Changed;

        public OutGameSession(OutGameData db, BalanceConfig cfg, SaveData save)
        {
            Db = db;
            Cfg = cfg;
            Save = save;
        }

        public DateTime Now
        {
            get { return Clock(); }
        }

        public int FormationSlots
        {
            get { return Cfg.playerSpawnPoints.Length; }
        }

        /// <summary>세이브를 읽어(없으면 신규 유저) 오프라인 군량 회복 · 일일 초기화 · 월드맵 진행 반영.</summary>
        public static OutGameSession Start(OutGameData db, BalanceConfig cfg)
        {
            var now = DateTime.UtcNow;
            var save = SaveStore.Load();
            bool isNew = save == null;
            if (isNew) save = HeroRules.NewSave(db, cfg.playerSpawnPoints.Length, now);
            var s = new OutGameSession(db, cfg, save) { IsNewUser = isNew };
            HeroRules.Sanitize(db, save, s.FormationSlots);
            EconomyRules.TickStamina(db, save, now);
            EconomyRules.RollDaily(save, now);
            ArenaRules.RollDaily(db, save, now);
            s.lastGold = save.gold;
            s.SyncWorldProgress();
            s.Commit();
            Current = s;
            return s;
        }

        public void Commit()
        {
            // 보물 조건 효과 「골드 사용」 = 저장 사이에 줄어든 골드(쓰는 동작은 각자 Commit · PD #1093 C)
            if (Save.gold < lastGold) TreasureRules.AddCount(Save, BattleEvents.GoldSpent, lastGold - Save.gold);
            lastGold = Save.gold;
            SaveStore.Write(Save, Now);
            if (Changed != null) Changed();
        }

        /// <summary>군량 회복만 반영(화면 갱신 주기 · 저장은 값이 바뀔 때만).</summary>
        public void TickStamina()
        {
            int before = Save.stamina;
            EconomyRules.TickStamina(Db, Save, Now);
            if (Save.stamina != before) Commit();
        }

        // ---------- 조회 ----------

        public HeroDb.Hero Def(string id)
        {
            return Db.Heroes.Get(id);
        }

        public HeroRules.Stats StatsOf(string id)
        {
            return HeroRules.Compute(Db, Cfg, Def(id), Save.Level(id), Save); // 훈련 · 보물 포함(PD #1093 C)
        }

        /// <summary>보유 목록(장수 = 영웅 · 병사 = 병사 유닛) · 표 순서.</summary>
        public List<HeroDb.Hero> Owned(bool soldiers)
        {
            var res = new List<HeroDb.Hero>();
            foreach (var h in Db.Heroes.heroes)
                if (h.isSoldier == soldiers && Save.Owns(h.id)) res.Add(h);
            return res;
        }

        /// <summary>지금 할 수 있는 성장(레벨업 · 장착 · 승급 · 진화)이 있는가 — 목록 카드 알림 점.</summary>
        public bool CanGrowAny(string id)
        {
            var h = Def(id);
            var lv = Save.Level(id);
            if (h == null || lv == null) return false;
            if (HeroRules.CanLevelUp(Db, Save, lv) == null) return true;
            var hs = Save.Hero(id);
            if (hs == null) return false;
            if (HeroRules.CanPromote(Db, h, hs) == null || HeroRules.CanEvolve(Db, h, hs) == null) return true;
            for (int i = 0; i < hs.gear.Count; i++)
                if (HeroRules.CanEquip(Db, Save, h, hs, i) == null) return true;
            return false;
        }

        public bool InActivePreset(string id)
        {
            var p = Save.ActivePreset;
            return p != null && p.slots.Contains(id);
        }

        // ---------- 성장 ----------

        public string LevelUp(string id)
        {
            var s = Save.Level(id);
            var why = HeroRules.CanLevelUp(Db, Save, s);
            if (why != null) return why;
            HeroRules.LevelUp(Db, Save, s);
            Commit();
            return null;
        }

        public string Equip(string id, int slot)
        {
            var h = Def(id);
            var s = Save.Hero(id);
            var why = HeroRules.CanEquip(Db, Save, h, s, slot);
            if (why != null) return why;
            HeroRules.Equip(Db, Save, h, s, slot);
            Commit();
            return null;
        }

        public string Promote(string id)
        {
            var h = Def(id);
            var s = Save.Hero(id);
            var why = HeroRules.CanPromote(Db, h, s);
            if (why != null) return why;
            HeroRules.Promote(Db, h, s);
            Commit();
            return null;
        }

        public string Evolve(string id)
        {
            var h = Def(id);
            var s = Save.Hero(id);
            var why = HeroRules.CanEvolve(Db, h, s);
            if (why != null) return why;
            HeroRules.Evolve(Db, h, s);
            Commit();
            return null;
        }

        // ---------- 편성 ----------

        /// <summary>프리셋 idx 저장 + 출전 프리셋으로 지정(빈 칸 허용 · 최소 1).</summary>
        public string SavePreset(int idx, List<string> slots)
        {
            if (idx < 0 || idx >= Save.presets.Count) return "없는 프리셋";
            int filled = 0;
            foreach (var id in slots)
            {
                if (string.IsNullOrEmpty(id)) continue;
                if (!Save.Owns(id)) return "미보유 " + id;
                filled++;
            }
            if (filled == 0) return "최소 1명은 출전해야 합니다";
            var p = Save.presets[idx];
            p.slots.Clear();
            for (int i = 0; i < FormationSlots; i++) p.slots.Add(i < slots.Count && slots[i] != null ? slots[i] : "");
            Save.presetIdx = idx;
            Commit();
            return null;
        }

        /// <summary>출전 편성 = 출전 프리셋의 자리 순서(0~2 전열 · 3~4 후열 → playerSpawnPoints) · 스탯 = §3-2 공식.</summary>
        public List<LineupEntry> BuildLineup()
        {
            var res = new List<LineupEntry>();
            var p = Save.ActivePreset;
            if (p == null) return res;
            for (int i = 0; i < p.slots.Count && i < FormationSlots; i++)
            {
                var id = p.slots[i];
                var h = Def(id);
                if (h == null || !Save.Owns(id)) continue;
                var st = StatsOf(id);
                var entry = new LineupEntry
                {
                    slot = i, id = h.id, name = h.nameKo, type = h.type, art = h.art,
                    hpMult = h.hpMult * st.GrowthOf("hp"), atkMult = h.atkMult * st.GrowthOf("atk"), defMult = h.defMult * st.GrowthOf("def"),
                };
                SkillRules.FillLineup(Db, Save, h, entry); // 스킬 id·레벨·★ 패시브 배율(PD #1093 B)
                res.Add(entry);
            }
            return res;
        }

        // ---------- 군량 ----------

        public int StaminaSecondsToNext()
        {
            return EconomyRules.SecondsToNext(Db, Save, Now);
        }

        /// <summary>스테이지 입장 비용 지불(부족 = false · 세이브 그대로).</summary>
        public bool TryPayEntry(BalanceConfig.StageDef s)
        {
            if (!EconomyRules.SpendStamina(Db, Save, EconomyRules.StageCost(Db, Save, s), Now)) return false;
            Commit();
            return true;
        }

        public string BuyStamina()
        {
            var why = EconomyRules.BuyStaminaWithGem(Db, Save, Now);
            if (why == null) Commit();
            return why;
        }

        public string AdStamina()
        {
            var why = EconomyRules.AdStamina(Db, Save, Now);
            if (why == null) Commit();
            return why;
        }

        // ---------- 전투 결과 · 소탕 ----------

        /// <summary>전투 종료(승리·패배) → 보상 계산·반영·저장. 경험 = 출전 전원(Deployed).</summary>
        public StageReward OnBattleEnd(BattleManager bm, bool win)
        {
            var stage = bm.Stage;
            int alive = bm.AliveCount(Faction.Player);
            bool allAlive = bm.Deployed.Count > 0 && alive >= bm.Deployed.Count;
            var r = EconomyRules.Compute(Db, Save, stage, win, allAlive, bm.TurnNumber, false, Rng);
            r.stamina = EconomyRules.StageCost(Db, Save, stage);
            var ids = new List<string>();
            foreach (var e in bm.Deployed) ids.Add(e.id);
            EconomyRules.Apply(Save, r, ids);
            ArenaRules.CountBattle(Save, bm); // 보물 조건 효과(전투 · 보스 처치)
            LastReward = r;
            Commit();
            return r;
        }

        /// <summary>소탕(별 3 · 군량만 · 전투 없음) = 반복 보상 · 경험 = 출전 프리셋. null = 군량 부족·불가.</summary>
        public StageReward Sweep(BalanceConfig.StageDef s)
        {
            if (!EconomyRules.CanSweep(Save, s)) return null;
            int cost = EconomyRules.StageCost(Db, Save, s);
            if (!EconomyRules.SpendStamina(Db, Save, cost, Now)) return null;
            var r = EconomyRules.Compute(Db, Save, s, true, true, 0, true, Rng);
            r.stamina = cost;
            var ids = new List<string>();
            foreach (var e in BuildLineup()) ids.Add(e.id);
            EconomyRules.Apply(Save, r, ids);
            LastReward = r;
            Commit();
            return r;
        }

        /// <summary>월드맵 진행(챕터별 앞에서부터 연속으로 깬 노드 수) = 세이브 스테이지 기록.</summary>
        public void SyncWorldProgress()
        {
            WorldProgress.Reset();
            for (int ch = 0; ch < Cfg.chapters.Length; ch++)
            {
                var list = Cfg.StagesOfChapter(Cfg.chapters[ch].no);
                int n = 0;
                while (n < list.Count)
                {
                    var st = Cfg.stages[list[n]];
                    var ss = Save.Stage(st.chapter, st.stage, false);
                    if (ss == null || ss.clears == 0) break;
                    n++;
                }
                if (n > 0) WorldProgress.MarkCleared(ch, n - 1);
            }
        }

        // ---------- 거래 ----------

        public List<GachaPull> Draw(int count)
        {
            var res = GachaRules.Draw(Db, Save, count, Rng);
            if (res.Count > 0) Commit();
            return res;
        }

        public void EnsureShop()
        {
            var day = Save.shop.day;
            int n = Save.shop.items.Count;
            EconomyRules.EnsureShop(Db, Save, Now, Rng);
            if (Save.shop.day != day || Save.shop.items.Count != n) Commit();
        }

        public string BuyShop(int index)
        {
            var why = EconomyRules.BuyShop(Save, index);
            if (why == null) Commit();
            return why;
        }

        public string RefreshShop()
        {
            var why = EconomyRules.RefreshShop(Db, Save, Rng);
            if (why == null) Commit();
            return why;
        }

        // ---------- 내정 · 보물 · 연무장(PD #1093 C) ----------

        /// <summary>규칙 호출 → 성공(null)이면 저장 · 반환 = 실패 사유.</summary>
        public string Do(Func<string> action)
        {
            var why = action();
            if (why == null) Commit();
            return why;
        }

        /// <summary>출전 프리셋 id(순찰 경험 대상).</summary>
        public List<string> PresetIds()
        {
            var ids = new List<string>();
            foreach (var e in BuildLineup()) ids.Add(e.id);
            return ids;
        }

        public PatrolYield Harvest(bool ad, out string why)
        {
            var y = PatrolRules.Harvest(Db, Save, Now, PresetIds(), ad, Rng, out why);
            if (y != null) Commit();
            return y;
        }

        public PatrolYield InstantHarvest(out string why)
        {
            var y = PatrolRules.Instant(Db, Save, PresetIds(), Rng, out why);
            if (y != null) Commit();
            return y;
        }

        public ChestResult OpenChest(string id)
        {
            var r = TreasureRules.Open(Db, Save, id, Rng);
            if (r != null) Commit();
            return r;
        }

        /// <summary>연무장 전투 문맥(결과 계산용) — kind · 대상(층 · 던전 id · 샘플 번호 · 보스 id).</summary>
        public class ModeCtx
        {
            public string kind;
            public string id;
            public int index;
        }

        public ModeCtx Mode;

        /// <summary>연무장 전투 끝 → 보상·기록·저장(결과 패널 표시용).</summary>
        public ModeResult OnModeEnd(BattleManager bm, bool win)
        {
            var m = Mode;
            if (m == null) return null;
            ModeResult r = null;
            switch (m.kind)
            {
                case ArenaRules.Tower: r = ArenaRules.TowerResult(Db, Save, m.index, win, Rng); break;
                case ArenaRules.Dungeon: r = ArenaRules.DungeonResult(Db, Save, m.id, win, Now, Rng); break;
                case ArenaRules.Arena: r = ArenaRules.ArenaResult(Db, Save, m.index, win, Now); break;
                case ArenaRules.Raid:
                    int dmg = 0;
                    bool killed = false;
                    foreach (var u in bm.Units)
                    {
                        if (u == null || u.Faction != Faction.Enemy || !u.IsBoss) continue;
                        dmg += u.MaxHp - u.Hp;
                        killed |= !u.IsAlive;
                    }
                    r = ArenaRules.RaidResult(Db, Save, m.id, dmg, killed, Now, Rng);
                    break;
            }
            ArenaRules.CountBattle(Save, bm);
            LastMode = r;
            Mode = null;
            Commit();
            return r;
        }
    }
}