export const DEFAULT_AUGMENTS = [
    { id: "force", name: "Kinetic Amplifier", effect: "+1 Damage on Melee attacks", cost: "2 Iron", precompile: 1 },
    { id: "fire", name: "Thermal Core", effect: "Deals Fire damage instead of Physical", cost: "1 Blaze Glass", precompile: 1 },
    { id: "shock", name: "Static Coil", effect: "Targets hit are Dazed", cost: "3 Copper", precompile: 2 },
    { id: "shield", name: "Reactive Plating", effect: "+1 Armor while equipped", cost: "2 Steel", precompile: 1 },
    { id: "range", name: "Long-Range Optics", effect: "Increases Range by 1 step", cost: "1 Lens", precompile: 2 },
    { id: "crit", name: "Precision Chip", effect: "+1 to Crit range", cost: "1 Gold", precompile: 3 },
    { id: "multi", name: "Burst Module", effect: "Can target 2 enemies (Half damage)", cost: "2 Gears", precompile: 4 },
    { id: "drain", name: "Siphon Link", effect: "Recover 1 Hope on kill", cost: "1 Soul Gem", precompile: 4 },
    { id: "weight", name: "Gravity Plate", effect: "Weapon is Heavy (more damage)", cost: "4 Lead", precompile: 2 }
];

// Global cache for resolved features to keep generators fast
const _featureCache = new Map();

export function getAugments() {
    return game.settings.get('dh-ikonis', 'augmentsList') || DEFAULT_AUGMENTS;
}

export function getSlotCount(item) {
    const flags = item.getFlag('dh-ikonis') || {};
    if (typeof flags.slotOverride === "number") return flags.slotOverride;

    let tier = item.system?.tier?.value;
    if (tier === undefined) tier = item.system?.tier;
    const tierNum = parseInt(tier) || 1;
    
    const settingKey = `slotsTier${tierNum}`;
    try {
        return game.settings.get('dh-ikonis', settingKey);
    } catch (e) {
        return tierNum >= 2 ? 3 : 2;
    }
}

/**
 * Robust feature fetching with timeout and caching.
 */
export async function getAttachedFeature(uuid) {
    if (!uuid) return null;
    if (_featureCache.has(uuid)) return _featureCache.get(uuid);
    
    const timeout = new Promise((_, reject) => 
        setTimeout(() => reject(new Error("Timeout fetching feature")), 2000)
    );

    try {
        const item = await Promise.race([fromUuid(uuid), timeout]);
        if (item) _featureCache.set(uuid, item);
        return item;
    } catch (err) {
        console.warn(`DH-Ikonis | Failed or timed out fetching feature [${uuid}]:`, err.message);
        return null;
    }
}

/**
 * Patches the system to ensure Ikonis effects are applied to the actor.
 */
export function patchIkonisLogic() {
    console.log("DH-Ikonis | Patching Actor for Ikonis effect injection...");

    // 1. Patch allApplicableEffects to inject Active Effects from Augments
    const originalAllEffects = Actor.prototype.allApplicableEffects;
    Actor.prototype.allApplicableEffects = function* () {
        // Yield standard effects
        yield* originalAllEffects.call(this);

        // Inject effects from equipped Ikonis weapons
        for (const item of this.items) {
            if (item.type !== 'weapon' || !item.system.equipped) continue;

            const installedIds = item.getFlag('dh-ikonis', 'installedAugments') || [];
            const allAugs = getAugments();
            
            for (const id of installedIds) {
                const aug = allAugs.find(a => String(a.id) === String(id));
                if (!aug?.featureUuid) continue;

                // We use sync lookup here because generators must be synchronous.
                // The features should already be in the cache from the sheet rendering.
                const feature = fromUuidSync(aug.featureUuid);
                if (!feature || !feature.effects) continue;

                for (const effect of feature.effects) {
                    // Only yield transfer effects (those meant to apply to the actor)
                    if (effect.transfer) yield effect;
                }
            }

            // Also check Bonded feature
            const bondedUuid = item.getFlag('dh-ikonis', 'bondedFeatureUuid');
            if (bondedUuid) {
                const feature = fromUuidSync(bondedUuid);
                if (feature?.effects) {
                    for (const effect of feature.effects) {
                        if (effect.transfer) yield effect;
                    }
                }
            }
        }
    };

    console.log("DH-Ikonis | Actor patches complete.");
}

export function patchDHWeapon() {
    console.log("DH-Ikonis | Patching DH Weapon system...");
    // Future: Add damage type override logic here
}