using System;

namespace WorldSim;

/// <summary>
/// Soul types — the four founding philosophies (SPEC §1).
/// MVP uses Nature only; the others exist so nothing hardcodes a single type.
/// </summary>
public enum SoulType
{
    Nature,        // South — take only what you need
    Generational,  // North — reverence for lineage
    Materialist,   // West — worth measured in visible possessions
    Selfish,       // East — personal gain, no guilt attached
}

/// <summary>
/// The soul imprint triad (SPEC §2 amendment, DESIGN.md debris model).
/// The soul itself never changes — these are the layers over it.
/// MVP behavior may read only Total, but all three sources are carried
/// so later phases (residual-soul verdicts, awareness thresholds,
/// source-specific clearing) need no data migration.
/// </summary>
public class SoulImprint
{
    public float SelfRegard;          // internal — how the soul sees itself
    public float OthersRegard;        // internal — how the soul sees others
    public float ExternalPerception;  // external — what others' souls pressed onto it

    public float Total => (SelfRegard + OthersRegard + ExternalPerception) / 3f;
    public float Radiance => 1f - Total;

    public void Clamp()
    {
        SelfRegard         = Math.Clamp(SelfRegard, 0f, 1f);
        OthersRegard       = Math.Clamp(OthersRegard, 0f, 1f);
        ExternalPerception = Math.Clamp(ExternalPerception, 0f, 1f);
    }
}

/// <summary>
/// Behavior weights per soul type (SPEC §9). Constrained emergence:
/// these weights pick WHICH valid option an NPC takes, never WHETHER
/// a solution exists. Swappable per type — the engine stays agnostic.
/// </summary>
public class SoulProfile
{
    public SoulType Type;

    public float Generosity;      // trade ratios, spontaneous help
    public float Sustainability;  // harvest caps (South: ~50% of a node)
    public float CommunityBias;   // communal-first building, socializing pull
    public float StatusBias;      // West: visible-wealth preference (unused in MVP)
    public float Accumulation;    // East: hoarding pressure (unused in MVP)

    // Knowledge culture (SPEC §5): how readily this soul absorbs from
    // others, and how deliberately it passes on what it knows. The North's
    // whole identity lives in these two numbers.
    public float Absorption = 1f;     // learning rate multiplier
    public float TeachingDrive = 0f;  // how much being near this soul teaches

    public static SoulProfile NatureSoul() => new()
    {
        Type           = SoulType.Nature,
        Generosity     = 0.9f,
        Sustainability = 0.9f,
        CommunityBias  = 0.8f,
        StatusBias     = 0.1f,
        Accumulation   = 0.1f,
        Absorption     = 1.0f,
        TeachingDrive  = 0.3f,   // knowledge passes casually, by living together
    };

    /// <summary>
    /// North-weighted profile: reverence for lineage, strong communal pull,
    /// modest material appetite. Their signature system — generational
    /// knowledge transfer (SPEC §5) — arrives with the expansion phase;
    /// until then they differ from the South in temperament, not verbs.
    /// </summary>
    public static SoulProfile GenerationalSoul() => new()
    {
        Type           = SoulType.Generational,
        Generosity     = 0.8f,
        Sustainability = 0.8f,
        CommunityBias  = 0.95f,
        StatusBias     = 0.15f,
        Accumulation   = 0.2f,
        Absorption     = 1.6f,   // raised to receive what elders hand down
        TeachingDrive  = 0.9f,   // and to hand it down in turn — the whole culture
    };

    /// <summary>
    /// West-weighted profile: worth measured in visible possessions
    /// (DESIGN.md). They build — even communally — but for display, so they
    /// expand shelters hard (status is size); moderate generosity, moderate
    /// hoarding, little interest in learning or teaching. A functioning town
    /// whose surplus goes to ostentation rather than resilience.
    /// </summary>
    public static SoulProfile MaterialistSoul() => new()
    {
        Type           = SoulType.Materialist,
        Generosity     = 0.4f,
        Sustainability = 0.6f,
        CommunityBias  = 0.6f,
        StatusBias     = 0.9f,
        Accumulation   = 0.6f,
        Absorption     = 0.9f,
        TeachingDrive  = 0.2f,
    };

    /// <summary>
    /// East-weighted profile — not part of MVP behavior, but defined now for
    /// the end-of-MVP contrast test (SPEC §11 amendment): 3 selfish NPCs
    /// dropped into the South town to prove weights alone change the society.
    /// </summary>
    public static SoulProfile SelfishSoul() => new()
    {
        Type           = SoulType.Selfish,
        Generosity     = 0.1f,
        Sustainability = 0.2f,
        CommunityBias  = 0.1f,
        StatusBias     = 0.5f,
        Accumulation   = 0.9f,
        Absorption     = 0.7f,   // they take, but rarely sit still to learn
        TeachingDrive  = 0.0f,   // and teach no one anything, ever
    };
}