using System;
using System.IO;
using System.Text;
using NeoModLoader.services;
using UnityEngine;

namespace IdleSpectator;

/// <summary>
/// Runtime scoring knobs loaded from <c>scoring-model.json</c> next to mod.json.
/// Edit that file to tune; code falls back to built-in defaults if missing/invalid.
/// </summary>
[Serializable]
public class ScoringModelDocument
{
    public string modVersion;
    public ScoringWeights weights;
    public StoryWeights story;
}

/// <summary>StoryPlanner knobs from scoring-model.json <c>story</c> block.</summary>
[Serializable]
public class StoryWeights
{
    public float nearTieEpsilon = 8f;
    /// <summary>
    /// Prefer / MC / MC-cast tips may beat a hotter stranger when the gap is below this
    /// (wider than <see cref="nearTieEpsilon"/>).
    /// </summary>
    public float sagaNearTieEpsilon = 28f;
    public float causalHeatHalfLifeSeconds = 180f;
    public float causalHeatWeight = 6f;
    public float causalRelatedWeight = 3f;
    public float arcOwnershipBoost = 18f;
    public float arcHoldMargin = 50f;
    public float aftermathStrength = 62f;
    public float aftermathMinWatch = 12f;
    public float aftermathMaxWatch = 20f;
    public float epilogueStrength = 48f;
    public float epilogueMaxWatch = 14f;
    public int ledgerCap = 16;
    public float ledgerWeight = 8f;
    public float historyDensityWindowSeconds = 600f;
    /// <summary>Obsolete ledger bleed (CharacterLedger removed); kept for json compat.</summary>
    public float ledgerBleedLifeChapter = 0.4f;
    /// <summary>Obsolete ledger bleed (CharacterLedger removed); kept for json compat.</summary>
    public float ledgerBleedVillage = 0.82f;
    /// <summary>Life-saga roster soft MC tip bonus.</summary>
    public float sagaMcWeight = 12f;
    /// <summary>Extra soft bonus when the saga slot is Prefer'd.</summary>
    public float sagaPreferWeight = 16f;
    /// <summary>Extra soft bonus when the unit is a WorldBox favorite.</summary>
    public float sagaGameFavoriteWeight = 8f;
    /// <summary>Soft bonus when tip touches an MC's story cast (lover/friend/kin/rival).</summary>
    public float sagaCastWeight = 5f;
    /// <summary>Extra tip bonus when subject/related/follow touch two or more roster MCs.</summary>
    public float sagaCrossMcBonus = 11f;
    /// <summary>Living rematch count before EarnRival (kill/death do not count).</summary>
    public int sagaRivalEncounterThreshold = 3;
    /// <summary>Chapter starvation window before dull non-favorite MCs lose rank.</summary>
    public float sagaDullSeconds = 300f;
    /// <summary>Extra FixedDwell beat cool for family chapters (seconds, stacks with base).</summary>
    public float familyLifeBeatCooldownSeconds = 90f;

    // --- Crisis chapters (Phase 4) ---
    /// <summary>WarFront needs at least this many participants to open a crisis chapter.</summary>
    public int crisisWarParticipantMin = 8;
    /// <summary>Disaster / outbreak EventStrength floor to open a crisis chapter.</summary>
    public float crisisDisasterStrengthMin = 95f;
    /// <summary>Score boost for tips that belong to the live crisis.</summary>
    public float crisisOwnershipBoost = 22f;
    /// <summary>Extra cut-in margin while watching a crisis tip against unrelated peers.</summary>
    public float crisisHoldMargin = 40f;
    /// <summary>Keep the chapter after the last crisis signal for this many seconds.</summary>
    public float crisisLingerSeconds = 10f;
    /// <summary>
    /// Disaster / outbreak linger after the last WorldLog pulse (tornado tips are short FixedDwell).
    /// </summary>
    public float crisisDisasterLingerSeconds = 28f;
    /// <summary>Hard cap on crisis Active phase length (seconds).</summary>
    public float crisisMaxSeconds = 180f;
    /// <summary>Do not reopen a crisis for this many seconds after Done.</summary>
    public float crisisCooldownSeconds = 45f;
    /// <summary>
    /// Longer cool after disaster/outbreak closers so stacked storm tips cannot double-close.
    /// </summary>
    public float crisisDisasterCooldownSeconds = 120f;
    /// <summary>Forced closer strength when a crisis chapter ends.</summary>
    public float crisisEpilogueStrength = 52f;
    /// <summary>Forced closer max watch (seconds).</summary>
    public float crisisEpilogueMaxWatch = 16f;
    /// <summary>
    /// After a hard story/crisis closer, suppress soft-life crumbs and character-fill
    /// for this many seconds so AFK does not immediately crumb-surf.
    /// </summary>
    public float softFillQuietSeconds = 18f;
}

/// <summary>Serializable weight block — field names must match scoring-model.json "weights".</summary>
[Serializable]
public class ScoringWeights
{
    public float charWeightEventLed = 0.18f;
    public float charWeightCharacterLed = 0.55f;
    public float visualMultiplier = 12f;
    public float noveltyMultiplier = 4f;

    // Director policy (score-native; replaces InterestTier preemption).
    public float cutInMargin = 35f;
    /// <summary>Extra margin required to interrupt sticky A scenes (combat/grief/status/hatch).</summary>
    public float stickyCutInMargin = 50f;
    /// <summary>
    /// EventStrength floor for mid-fight urgent cuts (catalog epic-world band, 95-100).
    /// Disasters / kingdom fall may interrupt a live scrap; lovers and daily Action may not.
    /// </summary>
    public float combatUrgentEventStrengthMin = 95f;
    /// <summary>
    /// Score margin over the live fight required when EventStrength clears
    /// <see cref="combatUrgentEventStrengthMin"/> (smaller than stickyCutInMargin).
    /// </summary>
    public float combatUrgentCutInMargin = 20f;
    /// <summary>After this many seconds on sticky combat/war, variety-valve peers may cut in.</summary>
    public float stickyVarietyValveAfterSeconds = 16f;
    /// <summary>
    /// Soft pair-combat valve open time (anonymous / single-notable Duels).
    /// Multi-fighter and notable-pair scraps still use stickyVarietyValveAfterSeconds.
    /// </summary>
    public float stickyVarietyValveAfterSecondsPair = 8f;
    /// <summary>Also open the valve after this fraction of MaxWatch (0.4 → 24s of a 60s combat).</summary>
    public float stickyVarietyValveMaxWatchFrac = 0.4f;
    /// <summary>Cut-in margin while the variety valve is open (between rotateSlack and stickyCutInMargin).</summary>
    public float stickyVarietyValveMargin = 20f;
    /// <summary>Lopsided fight scale multiplier floor (38v1 → near this; 1v1 balanced → 1).</summary>
    public float fightBalanceLopsidedFloor = 0.28f;
    /// <summary>Balance ratio (min/max sides) at which the fight gets full scale bonus.</summary>
    public float fightBalanceFullAt = 0.55f;
    /// <summary>Small bonus when WarFront has two material kingdom sides.</summary>
    public float warFrontBalanceBonus = 12f;
    public float rotateSlack = 12f;
    public float fillScoreMax = 55f;
    public float noticeScoreMin = 70f;
    public float hotScoreMin = 110f;
    public float dwellFill = 8f;
    public float dwellNormal = 15f;
    public float dwellHot = 15f;
    public float fillRotateSeconds = 8f;
    /// <summary>Minimum seconds on an EventLed shot before peer rotate / soft cut (interrupts bypass). Ambient exempt.</summary>
    public float minCameraDwell = 15f;

    // MaxWatch caps by completion class (director clamps candidate.MaxWatch).
    public float maxWatchMoment = 15f;
    public float maxWatchStatus = 30f;
    public float maxWatchGrief = 45f;
    public float maxWatchCombat = 60f;
    /// <summary>Cap for soft pair Duels (anonymous / single-notable); multi scrap uses maxWatchCombat.</summary>
    public float maxWatchDuel = 24f;
    public float maxWatchEpic = 50f;

    public int massFighterThreshold = 4;
    public float massBaseBonus = 28f;
    public float massPerExtraFighter = 4f;
    public float massExtraCap = 24f;
    /// <summary>Fighter count at which combat ensembles use Mass scale framing.</summary>
    public int massCrowdThreshold = 8;
    public int duelMaxFighters = 2;
    public float duelNotablePairBonus = 55f;
    public float duelSingleNotableBonus = 15f;
    public float duelAnonymousPenalty = -24f;
    public int skirmishMinFighters = 3;
    public float notableSkirmishPer = 12f;
    public float notableSkirmishCap = 35f;

    public float clusterDeathWeight = 10f;
    public float clusterFighterWeight = 14f;
    public float clusterNotableWeight = 22f;
    public float clusterMassBonus = 28f;
    public float clusterDuelPenalty = -8f;
    public float clusterNotableDuelBonus = 45f;
    public float clusterSingleNotableBonus = 12f;
    public float preferNotableDuelMargin = 15f;
    public float battleCharPerNotable = 18f;

    public float metaFavorite = 22f;
    public float metaKing = 18f;
    public float metaLeader = 14f;
    public float metaRenownDivisor = 120f;
    public float metaRenownCap = 8f;
    public float metaKillsFactor = 0.35f;
    public float metaKillsCap = 12f;
    public float metaLevelFactor = 0.4f;
    public float metaLevelCap = 10f;
    /// <summary>Bonus when the follow unit is the only living member of its species.</summary>
    public float speciesSingletonBonus = 14f;
    /// <summary>Bonus when species population is between 2 and speciesRareMaxPop inclusive.</summary>
    public float speciesRareBonus = 8f;
    public int speciesRareMaxPop = 5;

    public int notableKills = 40;
    public float notableRenown = 200f;
    public int extremeNotableKills = 80;
    public float extremeNotableRenown = 400f;

    public float scannerAttackBonus = 40f;
    public float scannerHotBonus = 18f;
    public float scannerWarmBonus = 8f;
    public float scannerSpectacleBonus = 12f;
    /// <summary>
    /// Idle spectacles (evil mage pacing, dragon roosting) keep at least this action score
    /// so warm civic chores cannot own ambient forever.
    /// </summary>
    public float scannerSpectacleIdleFloor = 48f;
    /// <summary>
    /// Prefer a live spectacle over a non-spectacle ambient pick when within this score gap.
    /// </summary>
    public float scannerSpectaclePreferMargin = 28f;
    public float scannerActionKillsFactor = 0.2f;
    public float scannerActionKillsCap = 10f;
    public float scannerWarriorBonus = 6f;
    public float scannerSingletonBonus = 8f;
    public float scannerCharKillsFactor = 0.15f;
    public float scannerCharKillsCap = 8f;
    public float scannerCharRenownDivisor = 120f;
    public float scannerCharRenownCap = 8f;
    public float scannerColdActionMul = 0.25f;
    public float scannerColdCharMul = 0.35f;
    public float scannerRankCharWeight = 0.18f;
    public float characterLedEventMul = 0.35f;

    public float eventLedTarget = 0.7f;
    public int mixWindow = 20;
    public float hardCooldownSeconds = 12f;
    /// <summary>
    /// Hard suppress window for the same FixedDwell beat (happiness effect / status / label)
    /// on the same subject so life milestones do not reclaim the camera every few seconds.
    /// </summary>
    public float fixedDwellBeatCooldownSeconds = 45f;
    /// <summary>
    /// Score subtracted per consecutive camera show of the same variety arc
    /// (e.g. duel → duel). Resets when a different arc is shown.
    /// </summary>
    public float repeatArcPenaltyPer = 24f;
    /// <summary>Cap on stacked repeat-arc penalty.</summary>
    public float repeatArcPenaltyCap = 72f;
    /// <summary>Rolling tip window for rarity/commonality score adjust.</summary>
    public int arcFrequencyWindow = 16;
    /// <summary>Soft per-arc share target inside the window (common arcs above this lose score).</summary>
    public float arcFairShare = 0.12f;
    /// <summary>Max TotalScore penalty when an arc saturates the window.</summary>
    public float arcOverSharePenaltyMax = 48f;
    /// <summary>Max TotalScore boost when an arc is absent from the window (rare).</summary>
    public float arcUnderShareBoostMax = 22f;
    /// <summary>Soft share cap for all combat arcs combined (duel + multi).</summary>
    public float arcCombatShareTarget = 0.35f;
    /// <summary>Extra penalty when combat share exceeds <see cref="arcCombatShareTarget"/>.</summary>
    public float arcCombatOverSharePenaltyMax = 36f;
    public int enrichTopK = 8;
    public float metaCacheTtl = 2f;
}

/// <summary>Loads and exposes <see cref="ScoringWeights"/> from scoring-model.json.</summary>
public static class InterestScoringConfig
{
    public const string FileName = "scoring-model.json";

    private static ScoringWeights _w = new ScoringWeights();
    private static StoryWeights _story = new StoryWeights();
    private static string _loadedPath = "";
    private static string _loadedVersion = "";
    private static bool _loadedFromFile;

    public static ScoringWeights W => _w;

    public static StoryWeights Story => _story;

    public static bool LoadedFromFile => _loadedFromFile;

    public static string LoadedPath => _loadedPath;

    public static string LoadedVersion => _loadedVersion;

    public static void LoadFromModFolder(string modFolder)
    {
        _w = new ScoringWeights();
        _story = new StoryWeights();
        _loadedFromFile = false;
        _loadedPath = "";
        _loadedVersion = "";

        if (string.IsNullOrEmpty(modFolder))
        {
            LogService.LogInfo("[IdleSpectator] scoring-model.json: no mod folder, using defaults");
            return;
        }

        string path = Path.Combine(modFolder, FileName);
        if (!File.Exists(path))
        {
            LogService.LogInfo($"[IdleSpectator] scoring-model.json missing at {path}, using defaults");
            return;
        }

        try
        {
            string json = File.ReadAllText(path);
            if (!TryParseDocument(json, out ScoringWeights weights, out StoryWeights story, out string version))
            {
                LogService.LogInfo("[IdleSpectator] scoring-model.json parse failed, using defaults");
                return;
            }

            _w = weights;
            _story = story ?? new StoryWeights();
            _loadedFromFile = true;
            _loadedPath = path;
            _loadedVersion = version ?? "";
            LogService.LogInfo(
                $"[IdleSpectator] scoring-model.json loaded v={_loadedVersion} charEvent={_w.charWeightEventLed:0.##} mass={_w.massBaseBonus:0.#} duelPair={_w.duelNotablePairBonus:0.#} storyNearTie={_story.nearTieEpsilon:0.#}");
        }
        catch (Exception ex)
        {
            _w = new ScoringWeights();
            _story = new StoryWeights();
            LogService.LogInfo($"[IdleSpectator] scoring-model.json failed ({ex.Message}), using defaults");
        }
    }

    /// <summary>
    /// Unity JsonUtility often returns null nested objects on mixed doc/schema files.
    /// Parse the weights object directly (extracted by brace matching).
    /// </summary>
    internal static bool TryParseDocument(
        string json,
        out ScoringWeights weights,
        out StoryWeights story,
        out string version)
    {
        weights = null;
        story = new StoryWeights();
        version = "";
        if (string.IsNullOrEmpty(json))
        {
            return false;
        }

        version = ExtractJsonString(json, "modVersion") ?? "";

        if (TryExtractObject(json, "story", out string storyJson))
        {
            StoryWeights parsedStory = JsonUtility.FromJson<StoryWeights>(storyJson);
            if (parsedStory != null)
            {
                story = parsedStory;
            }
        }

        // Prefer direct FromJson of the weights object — reliable with flat numeric fields.
        if (TryExtractObject(json, "weights", out string weightsJson))
        {
            ScoringWeights parsed = JsonUtility.FromJson<ScoringWeights>(weightsJson);
            if (parsed != null)
            {
                weights = parsed;
                return true;
            }
        }

        // Fallback: whole-document parse (works if file is weights-only wrapped).
        ScoringModelDocument doc = JsonUtility.FromJson<ScoringModelDocument>(json);
        if (doc?.weights != null)
        {
            weights = doc.weights;
            if (doc.story != null)
            {
                story = doc.story;
            }

            if (!string.IsNullOrEmpty(doc.modVersion))
            {
                version = doc.modVersion;
            }

            return true;
        }

        return false;
    }

    private static string ExtractJsonString(string json, string key)
    {
        string needle = "\"" + key + "\"";
        int keyAt = json.IndexOf(needle, StringComparison.Ordinal);
        if (keyAt < 0)
        {
            return null;
        }

        int colon = json.IndexOf(':', keyAt + needle.Length);
        if (colon < 0)
        {
            return null;
        }

        int i = colon + 1;
        while (i < json.Length && char.IsWhiteSpace(json[i]))
        {
            i++;
        }

        if (i >= json.Length || json[i] != '"')
        {
            return null;
        }

        i++;
        var sb = new StringBuilder();
        while (i < json.Length)
        {
            char c = json[i++];
            if (c == '\\' && i < json.Length)
            {
                sb.Append(json[i++]);
                continue;
            }

            if (c == '"')
            {
                break;
            }

            sb.Append(c);
        }

        return sb.ToString();
    }

    private static bool TryExtractObject(string json, string key, out string objectJson)
    {
        objectJson = null;
        string needle = "\"" + key + "\"";
        int keyAt = json.IndexOf(needle, StringComparison.Ordinal);
        if (keyAt < 0)
        {
            return false;
        }

        int brace = json.IndexOf('{', keyAt + needle.Length);
        if (brace < 0)
        {
            return false;
        }

        int depth = 0;
        for (int i = brace; i < json.Length; i++)
        {
            char c = json[i];
            if (c == '{')
            {
                depth++;
            }
            else if (c == '}')
            {
                depth--;
                if (depth == 0)
                {
                    objectJson = json.Substring(brace, i - brace + 1);
                    return true;
                }
            }
        }

        return false;
    }

    /// <summary>Harness / debug: reload from disk without restarting the game.</summary>
    public static bool Reload()
    {
        string folder = ModClass.ModFolder;
        if (string.IsNullOrEmpty(folder))
        {
            return false;
        }

        LoadFromModFolder(folder);
        return _loadedFromFile;
    }
}