using Content.Server.Administration.Logs;
using Content.Server.Antag;
using Content.Server.EUI;
using Content.Server.Flash;
using Content.Server.GameTicking.Rules.Components;
using Content.Server.Mind;
using Content.Server.Popups;
using Content.Server.Revolutionary;
using Content.Server.Revolutionary.Components;
using Content.Server.Roles;
using Content.Server.RoundEnd;
using Content.Server.Shuttles.Systems;
using Content.Server.Station.Systems;
using Content.Shared.Database;
using Content.Shared.Humanoid;
using Content.Shared.IdentityManagement;
using Content.Shared.Inventory;
using Content.Shared.Mind;
using Content.Shared.Mind.Components;
using Content.Shared.Mindshield.Components;
using Content.Shared.Mobs;
using Content.Shared.Mobs.Components;
using Content.Shared.Mobs.Systems;
using Content.Shared.NPC.Prototypes;
using Content.Shared.NPC.Systems;
using Content.Shared.Revolutionary.Components;
using Content.Shared.Roles;
using Content.Shared.Stunnable;
using Content.Shared.Zombies;
using Robust.Shared.Prototypes;
using Robust.Shared.Timing;
using System.Linq;

namespace Content.Server.GameTicking.Rules;

/// <summary>
/// Where all the main stuff for Revolutionaries happens (Assigning Head Revs, Command on station, and checking for the game to end.)
/// </summary>
public sealed class RevolutionaryRuleSystem : GameRuleSystem<RevolutionaryRuleComponent>
{
    [Dependency] private readonly IAdminLogManager _adminLogManager = default!;
    [Dependency] private readonly IGameTiming _timing = default!;
    [Dependency] private readonly AntagSelectionSystem _antagSelection = default!;
    [Dependency] private readonly EuiManager _euiMan = default!;
    [Dependency] private readonly MindSystem _mind = default!;
    [Dependency] private readonly MobStateSystem _mobState = default!;
    [Dependency] private readonly NpcFactionSystem _npcFaction = default!;
    [Dependency] private readonly PopupSystem _popup = default!;
    [Dependency] private readonly RoleSystem _role = default!;
    [Dependency] private readonly SharedStunSystem _stun = default!;
    [Dependency] private readonly RoundEndSystem _roundEnd = default!;
    [Dependency] private readonly StationSystem _stationSystem = default!;
    [Dependency] private readonly EmergencyShuttleSystem _emergencyShuttle = default!;
    [Dependency] private readonly InventorySystem _inventory = default!;

    //Used in OnPostFlash, no reference to the rule component is available
    public readonly ProtoId<NpcFactionPrototype> RevolutionaryNpcFaction = "Revolutionary";
    public readonly ProtoId<NpcFactionPrototype> RevPrototypeId = "Rev";

    public override void Initialize()
    {
        base.Initialize();
        SubscribeLocalEvent<RoundStartAttemptEvent>(OnStartAttempt);
        SubscribeLocalEvent<RulePlayerJobsAssignedEvent>(OnPlayerJobAssigned);
        SubscribeLocalEvent<CommandStaffComponent, MobStateChangedEvent>(OnCommandMobStateChanged);
        SubscribeLocalEvent<HeadRevolutionaryComponent, MobStateChangedEvent>(OnHeadRevMobStateChanged);
        SubscribeLocalEvent<RoundEndTextAppendEvent>(OnRoundEndText);
        SubscribeLocalEvent<RevolutionaryRoleComponent, GetBriefingEvent>(OnGetBriefing);
        SubscribeLocalEvent<HeadRevolutionaryComponent, AfterFlashedEvent>(OnPostFlash);
    }

    //Set miniumum players
    protected override void Added(EntityUid uid, RevolutionaryRuleComponent component, GameRuleComponent gameRule, GameRuleAddedEvent args)
    {
        base.Added(uid, component, gameRule, args);

        gameRule.MinPlayers = component.MinPlayers;
    }

    protected override void Started(EntityUid uid, RevolutionaryRuleComponent component, GameRuleComponent gameRule, GameRuleStartedEvent args)
    {
        base.Started(uid, component, gameRule, args);
        component.CommandCheck = _timing.CurTime + component.TimerWait;
    }

    protected override void ActiveTick(EntityUid uid, RevolutionaryRuleComponent component, GameRuleComponent gameRule, float frameTime)
    {
        base.ActiveTick(uid, component, gameRule, frameTime);
        if (component.CommandCheck <= _timing.CurTime)
        {
            component.CommandCheck = _timing.CurTime + component.TimerWait;

            if (CheckCommandLose())
            {
                _roundEnd.DoRoundEndBehavior(RoundEndBehavior.ShuttleCall, component.ShuttleCallTime);
                GameTicker.EndGameRule(uid, gameRule);
            }
        }
    }

    private void OnRoundEndText(RoundEndTextAppendEvent ev)
    {
        var revsLost = CheckRevsLose();
        var commandLost = CheckCommandLose();
        var query = AllEntityQuery<RevolutionaryRuleComponent>();
        while (query.MoveNext(out var headrev))
        {
            // This is (revsLost, commandsLost) concatted together
            // (moony wrote this comment idk what it means)
            var index = (commandLost ? 1 : 0) | (revsLost ? 2 : 0);
            ev.AddLine(Loc.GetString(Outcomes[index]));

            ev.AddLine(Loc.GetString("rev-headrev-count", ("initialCount", headrev.HeadRevs.Count)));
            foreach (var player in headrev.HeadRevs)
            {
                // TODO: when role entities are a thing this has to change
                var count = CompOrNull<RevolutionaryRoleComponent>(player.Value)?.ConvertedCount ?? 0;

                _mind.TryGetSession(player.Value, out var session);
                var username = session?.Name;
                if (username != null)
                {
                    ev.AddLine(Loc.GetString("rev-headrev-name-user",
                    ("name", player.Key),
                    ("username", username), ("count", count)));
                }
                else
                {
                    ev.AddLine(Loc.GetString("rev-headrev-name",
                    ("name", player.Key), ("count", count)));
                }

                // TODO: someone suggested listing all alive? revs maybe implement at some point
            }
        }
    }

    private void OnGetBriefing(EntityUid uid, RevolutionaryRoleComponent comp, ref GetBriefingEvent args)
    {
        if (!TryComp<MindComponent>(uid, out var mind) || mind.OwnedEntity == null)
            return;

        var head = HasComp<HeadRevolutionaryComponent>(mind.OwnedEntity);
        args.Append(Loc.GetString(head ? "head-rev-briefing" : "rev-briefing"));
    }

    //Check for enough players to start rule
    private void OnStartAttempt(RoundStartAttemptEvent ev)
    {
        TryRoundStartAttempt(ev, Loc.GetString("roles-antag-rev-name"));
    }

    private void OnPlayerJobAssigned(RulePlayerJobsAssignedEvent ev)
    {
        var query = QueryActiveRules();
        while (query.MoveNext(out var uid, out var activeGameRule, out var comp, out var gameRule))
        {
            var eligiblePlayers = _antagSelection.GetEligiblePlayers(ev.Players, comp.HeadRevPrototypeId);

            if (eligiblePlayers.Count == 0)
                continue;

            var headRevCount = _antagSelection.CalculateAntagCount(ev.Players.Length, comp.PlayersPerHeadRev, comp.MaxHeadRevs);

            var headRevs = _antagSelection.ChooseAntags(headRevCount, eligiblePlayers);

            GiveHeadRev(headRevs, comp.HeadRevPrototypeId, comp);
        }
    }

    private void GiveHeadRev(IEnumerable<EntityUid> chosen, ProtoId<AntagPrototype> antagProto, RevolutionaryRuleComponent comp)
    {
        foreach (var headRev in chosen)
            GiveHeadRev(headRev, antagProto, comp);
    }
    private void GiveHeadRev(EntityUid chosen, ProtoId<AntagPrototype> antagProto, RevolutionaryRuleComponent comp)
    {
        RemComp<CommandStaffComponent>(chosen);

        var inCharacterName = MetaData(chosen).EntityName;

        if (!_mind.TryGetMind(chosen, out var mind, out _))
            return;

        if (!_role.MindHasRole<RevolutionaryRoleComponent>(mind))
        {
            _role.MindAddRole(mind, new RevolutionaryRoleComponent { PrototypeId = antagProto }, silent: true);
        }

        comp.HeadRevs.Add(inCharacterName, mind);
        _inventory.SpawnItemsOnEntity(chosen, comp.StartingGear);
        var revComp = EnsureComp<RevolutionaryComponent>(chosen);
        EnsureComp<HeadRevolutionaryComponent>(chosen);

        _antagSelection.SendBriefing(chosen, Loc.GetString("head-rev-role-greeting"), Color.CornflowerBlue, revComp.RevStartSound);
    }

    /// <summary>
    /// Called when a Head Rev uses a flash in melee to convert somebody else.
    /// </summary>
    private void OnPostFlash(EntityUid uid, HeadRevolutionaryComponent comp, ref AfterFlashedEvent ev)
    {
        var alwaysConvertible = HasComp<AlwaysRevolutionaryConvertibleComponent>(ev.Target);

        if (!_mind.TryGetMind(ev.Target, out var mindId, out var mind) && !alwaysConvertible)
            return;

        if (HasComp<RevolutionaryComponent>(ev.Target) ||
            HasComp<MindShieldComponent>(ev.Target) ||
            !HasComp<HumanoidAppearanceComponent>(ev.Target) &&
            !alwaysConvertible ||
            !_mobState.IsAlive(ev.Target) ||
            HasComp<ZombieComponent>(ev.Target))
        {
            return;
        }

        _npcFaction.AddFaction(ev.Target, RevolutionaryNpcFaction);
        var revComp = EnsureComp<RevolutionaryComponent>(ev.Target);

        if (ev.User != null)
        {
            _adminLogManager.Add(LogType.Mind, LogImpact.Medium, $"{ToPrettyString(ev.User.Value)} converted {ToPrettyString(ev.Target)} into a Revolutionary");

            if (_mind.TryGetRole<RevolutionaryRoleComponent>(ev.User.Value, out var headrev))
                headrev.ConvertedCount++;
        }

        if (mindId == default || !_role.MindHasRole<RevolutionaryRoleComponent>(mindId))
        {
            _role.MindAddRole(mindId, new RevolutionaryRoleComponent { PrototypeId = RevPrototypeId });
        }

        if (mind?.Session != null)
            _antagSelection.SendBriefing(mind.Session, Loc.GetString("rev-role-greeting"), Color.Red, revComp.RevStartSound);
    }

    public void OnHeadRevAdmin(EntityUid entity)
    {
        if (HasComp<HeadRevolutionaryComponent>(entity))
            return;

        var revRule = EntityQuery<RevolutionaryRuleComponent>().FirstOrDefault();
        if (revRule == null)
        {
            GameTicker.StartGameRule("Revolutionary", out var ruleEnt);
            revRule = Comp<RevolutionaryRuleComponent>(ruleEnt);
        }

        GiveHeadRev(entity, revRule.HeadRevPrototypeId, revRule);
    }

    //TODO: Enemies of the revolution
    private void OnCommandMobStateChanged(EntityUid uid, CommandStaffComponent comp, MobStateChangedEvent ev)
    {
        if (ev.NewMobState == MobState.Dead || ev.NewMobState == MobState.Invalid)
            CheckCommandLose();
    }

    /// <summary>
    /// Checks if all of command is dead and if so will remove all sec and command jobs if there were any left.
    /// </summary>
    private bool CheckCommandLose()
    {
        var commandList = new List<EntityUid>();

        var heads = AllEntityQuery<CommandStaffComponent>();
        while (heads.MoveNext(out var id, out _))
        {
            commandList.Add(id);
        }

        return IsGroupDead(commandList, true);
    }

    private void OnHeadRevMobStateChanged(EntityUid uid, HeadRevolutionaryComponent comp, MobStateChangedEvent ev)
    {
        if (ev.NewMobState == MobState.Dead || ev.NewMobState == MobState.Invalid)
            CheckRevsLose();
    }

    /// <summary>
    /// Checks if all the Head Revs are dead and if so will deconvert all regular revs.
    /// </summary>
    private bool CheckRevsLose()
    {
        var stunTime = TimeSpan.FromSeconds(4);
        var headRevList = new List<EntityUid>();

        var headRevs = AllEntityQuery<HeadRevolutionaryComponent, MobStateComponent>();
        while (headRevs.MoveNext(out var uid, out _, out _))
        {
            headRevList.Add(uid);
        }

        // If no Head Revs are alive all normal Revs will lose their Rev status and rejoin Nanotrasen
        if (IsGroupDead(headRevList, false))
        {
            var rev = AllEntityQuery<RevolutionaryComponent, MindContainerComponent>();
            while (rev.MoveNext(out var uid, out _, out var mc))
            {
                if (HasComp<HeadRevolutionaryComponent>(uid))
                    continue;

                _npcFaction.RemoveFaction(uid, RevolutionaryNpcFaction);
                _stun.TryParalyze(uid, stunTime, true);
                RemCompDeferred<RevolutionaryComponent>(uid);
                _popup.PopupEntity(Loc.GetString("rev-break-control", ("name", Identity.Entity(uid, EntityManager))), uid);
                _adminLogManager.Add(LogType.Mind, LogImpact.Medium, $"{ToPrettyString(uid)} was deconverted due to all Head Revolutionaries dying.");

                if (!_mind.TryGetMind(uid, out var mindId, out var mind, mc))
                    continue;

                // remove their antag role
                _role.MindTryRemoveRole<RevolutionaryRoleComponent>(mindId);

                // make it very obvious to the rev they've been deconverted since
                // they may not see the popup due to antag and/or new player tunnel vision
                if (_mind.TryGetSession(mindId, out var session))
                    _euiMan.OpenEui(new DeconvertedEui(), session);
            }
            return true;
        }

        return false;
    }

    /// <summary>
    /// Will take a group of entities and check if they are all alive or dead
    /// </summary>
    /// <param name="list">The list of the entities</param>
    /// <param name="checkOffStation">Bool for if you want to check if someone is in space and consider them dead. (Won't check when emergency shuttle arrives just in case)</param>
    /// <returns></returns>
    private bool IsGroupDead(List<EntityUid> list, bool checkOffStation)
    {
        var dead = 0;
        foreach (var entity in list)
        {
            if (TryComp<MobStateComponent>(entity, out var state))
            {
                if (state.CurrentState == MobState.Dead || state.CurrentState == MobState.Invalid)
                {
                    dead++;
                }
                else if (checkOffStation && _stationSystem.GetOwningStation(entity) == null && !_emergencyShuttle.EmergencyShuttleArrived)
                {
                    dead++;
                }
            }
            //If they don't have the MobStateComponent they might as well be dead.
            else
            {
                dead++;
            }
        }

        return dead == list.Count || list.Count == 0;
    }

    private static readonly string[] Outcomes =
    {
        // revs survived and heads survived... how
        "rev-reverse-stalemate",
        // revs won and heads died
        "rev-won",
        // revs lost and heads survived
        "rev-lost",
        // revs lost and heads died
        "rev-stalemate"
    };
}