using System;
using System.Collections.Generic;
using NeoModLoader.services;
using UnityEngine;

namespace IdleSpectator;

public static class CameraDirector
{
    public static string LastWatchLabel { get; private set; } = "";
    public static string LastWatchAssetId { get; private set; } = "";
    public static string LastFormattedWatchTip { get; private set; } = "";
    private const float ExactPresentationCooldownSeconds = 90f;
    private static readonly Dictionary<string, float> PresentedLabels =
        new Dictionary<string, float>(StringComparer.OrdinalIgnoreCase);

    public static void FocusUnit(Actor actor, bool updateCaption = true)
    {
        if (actor != null && actor.isAlive())
        {
            RetargetFollow(actor);
            if (updateCaption && SpectatorMode.Active)
            {
                WatchCaption.SetFromActor(actor);
            }
        }
    }

    public static void Watch(InterestEvent interest)
    {
        if (interest == null || !interest.HasValidPosition)
        {
            return;
        }

        if (!Config.game_loaded || World.world == null)
        {
            return;
        }

        string incomingLabel = (interest.Label ?? "").Trim();
        if (!string.IsNullOrEmpty(incomingLabel)
            && !string.Equals(incomingLabel, LastWatchLabel, StringComparison.Ordinal)
            && WasPresentedRecently(incomingLabel, Time.unscaledTime))
        {
            // Sticky maintain paths may reassert a prior label without going through
            // candidate selection. Do not turn that refresh into a new camera cut or log,
            // but do commit the label when it belongs to the already-focused active scene.
            long incomingId = EventFeedUtil.SafeId(interest.FollowUnit);
            long focusedId = EventFeedUtil.SafeId(
                MoveCamera.hasFocusUnit() ? MoveCamera._focus_unit : null);
            InterestCandidate active = InterestDirector.CurrentCandidate;
            if (incomingId != 0
                && incomingId == focusedId
                && active != null
                && string.Equals(active.Label ?? "", incomingLabel, StringComparison.Ordinal))
            {
                RefreshWatchPresentation(interest, suppressReplayLog: true);
            }
            return;
        }

        Actor follow = ResolveFollowUnit(interest);
        if (follow != null && follow.isAlive())
        {
            // Focus first, then nametag - same order as FocusUnit, so tip/focus/dossier
            // never diverge across a handoff frame.
            RetargetFollow(follow);
            // Same subject: skip full UnitDossier.FromActor rebuild (was walking every
            // alive unit for species counts on every Mass headcount tip refresh).
            // WatchCaption.Update already refreshes reason/task/identity live.
            long followId = EventFeedUtil.SafeId(follow);
            if (followId == 0 || followId != WatchCaption.CurrentUnitId)
            {
                WatchCaption.SetFromActor(follow);
            }
            else
            {
                WatchCaption.RefreshOwnedReasonNow();
            }

            CommitWatchTelemetry(interest);
            return;
        }

        // No accepted living follow: do not bind a rejected FollowUnit
        // (dead / species mismatch) as the dossier subject.
        bool unmatchedSpeciesTip = (interest.Label ?? "").StartsWith(
            "New species:",
            StringComparison.Ordinal);
        if (unmatchedSpeciesTip)
        {
            // Discovery may know the species before a matching live unit can be resolved.
            // Keep the current living focus; never clear it in favor of a ghost asset id.
            WatchCaption.SetFromInterest(interest);
            CommitWatchTelemetry(interest);
            return;
        }

        WatchCaption.SetFromLocationInterest(interest);
        ClearFollow();
        PanCamera(interest.Position);

        CommitWatchTelemetry(interest);
    }

    /// <summary>
    /// Publish reason telemetry only after camera focus and caption ownership have committed.
    /// This makes Watching/focus/caption one observable transition rather than three frames.
    /// </summary>
    private static void CommitWatchTelemetry(
        InterestEvent interest,
        bool suppressReplayLog = false)
    {
        string tip = FormatWatchTip(interest);
        string label = interest?.Label ?? "";
        string assetId = interest?.AssetId ?? "";
        // AssetId-only churn (live_combat ↔ live_battle) must not re-log the same tip.
        bool tipChanged = !string.Equals(tip, LastFormattedWatchTip, StringComparison.Ordinal)
                          || !string.Equals(label, LastWatchLabel, StringComparison.Ordinal);
        bool framingOnly = tipChanged
                           && (EventReason.IsHeadcountOnlyChange(LastWatchLabel, label)
                               || EventReason.IsCombatFramingOnlyChange(LastWatchLabel, label));
        LastFormattedWatchTip = tip;
        // LastWatchLabel is tip/harness telemetry only - never dossier reason truth.
        LastWatchLabel = label;
        LastWatchAssetId = assetId;
        // Sticky Mass tips tick headcounts / side-order / Battle↔Mass often - log structure only.
        if (tipChanged && !framingOnly && !suppressReplayLog)
        {
            NotePresentedLabel(label, Time.unscaledTime);
            LogService.LogInfo($"[IdleSpectator] {tip}");
        }
    }

    /// <summary>
    /// Commit a same-focus sticky reframe without retargeting the camera or rebuilding the
    /// dossier. Used for Duel/Battle/Mass and headcount changes that are presentation-only.
    /// </summary>
    public static void RefreshWatchPresentation(
        InterestEvent interest,
        bool suppressReplayLog = false)
    {
        if (interest == null)
        {
            return;
        }

        WatchCaption.RefreshOwnedReasonNow();
        CommitWatchTelemetry(interest, suppressReplayLog);
    }

    private static bool WasPresentedRecently(string label, float now)
    {
        string key = EventReason.ReplayStructureKey(label);
        return !string.IsNullOrEmpty(key)
               && PresentedLabels.TryGetValue(key, out float shownAt)
               && now - shownAt >= 0f
               && now - shownAt < ExactPresentationCooldownSeconds;
    }

    private static void NotePresentedLabel(string label, float now)
    {
        string key = EventReason.ReplayStructureKey(label);
        if (string.IsNullOrEmpty(key)) return;
        PresentedLabels[key] = now;
        if (PresentedLabels.Count <= 128) return;
        var expired = new List<string>();
        foreach (KeyValuePair<string, float> entry in PresentedLabels)
        {
            if (now - entry.Value >= ExactPresentationCooldownSeconds * 2f)
            {
                expired.Add(entry.Key);
            }
        }
        for (int i = 0; i < expired.Count; i++) PresentedLabels.Remove(expired[i]);
    }

    public static void ClearReplayLedger()
    {
        PresentedLabels.Clear();
    }

    public static bool HarnessProbeExactPresentationReplay(out string detail)
    {
        PresentedLabels.Clear();
        NotePresentedLabel("Duel - Aro vs Bex", 10f);
        bool sameBlocked = WasPresentedRecently("Duel - Aro vs Bex", 20f);
        bool reframedBlocked =
            WasPresentedRecently("Mass - Bex (4) vs Aro (7)", 20f);
        bool otherOpen = !WasPresentedRecently("Duel - Aro vs Cid", 20f);
        bool expired = !WasPresentedRecently("Duel - Aro vs Bex", 101f);
        bool ok = sameBlocked && reframedBlocked && otherOpen && expired;
        detail = "same=" + sameBlocked + " reframed=" + reframedBlocked
                 + " other=" + otherOpen
                 + " expired=" + expired + " pass=" + ok;
        PresentedLabels.Clear();
        return ok;
    }

    private static Actor ResolveFollowUnit(InterestEvent interest)
    {
        if (interest == null)
        {
            return null;
        }

        Actor follow = interest.HasFollowUnit ? interest.FollowUnit : null;

        // Species discovery: only attach a species-matched unit, never a random stranger.
        bool speciesTip = interest.Label != null
                          && interest.Label.StartsWith("New species:");
        if (follow == null
            && speciesTip
            && !string.IsNullOrEmpty(interest.AssetId)
            && interest.AssetId != "live_battle"
            && interest.AssetId != "scored_unit")
        {
            follow = WorldActivityScanner.FindNearestAliveUnit(interest.Position, 24f, interest.AssetId);
        }

        if (follow == null || !follow.isAlive())
        {
            return null;
        }

        if (speciesTip
            && !string.IsNullOrEmpty(interest.AssetId)
            && follow.asset != null
            && follow.asset.id != interest.AssetId)
        {
            return WorldActivityScanner.FindNearestAliveUnit(interest.Position, 24f, interest.AssetId);
        }

        return follow;
    }

    public static string FormatWatchTip(InterestEvent interest)
    {
        if (interest == null || string.IsNullOrEmpty(interest.Label))
        {
            return "Watching";
        }

        return "Watching: " + interest.Label;
    }

    public static void ClearFollow()
    {
        MoveCamera.clearFocusUnitOnly();
    }

    public static void ClearWatchReason()
    {
        LastWatchLabel = "";
        LastWatchAssetId = "";
        LastFormattedWatchTip = "Watching";
    }

    public static void PanTo(Vector3 pos)
    {
        PanCamera(pos);
    }

    private static void RetargetFollow(Actor actor)
    {
        if (MoveCamera.isCameraFollowingUnit(actor))
        {
            return;
        }

        bool firstFocus = !MoveCamera.hasFocusUnit();
        MoveCamera.setFocusUnit(actor);
        Chronicle.NoteFocus(actor);

        MoveCamera cam = MoveCamera.instance;
        if (cam == null)
        {
            return;
        }

        // Same as vanilla killer handoff: reset ease so the camera lerps to the new unit.
        cam._focus_timer = 0f;
        if (firstFocus)
        {
            cam._target_zoom = 15f;
            cam._focus_zoom = 15f;
        }
    }

    private static void PanCamera(Vector3 pos)
    {
        MoveCamera cam = MoveCamera.instance;
        if (cam == null)
        {
            World.world.locatePosition(pos);
            return;
        }

        pos.z = cam.transform.position.z;
        cam.transform.position = pos;
        cam._target_zoom = 15f;
        cam._focus_zoom = 15f;
    }
}