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 caches for resolved features to keep getters fast
const _featureCache = new Map();

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

/**
 * Pre-loads all features from the compendium into memory.
 * This is necessary because sheetLists getter is synchronous.
 */
export async function loadIkonisFeatures() {
    console.log("DH-Ikonis | Pre-loading features into cache...");
    const allAugs = getAugments();
    const bondedUuid = game.settings.get('dh-ikonis', 'defaultBondedUuid');
    
    const uuids = new Set(allAugs.map(a => a.featureUuid).filter(Boolean));
    if (bondedUuid) uuids.add(bondedUuid);

    for (const uuid of uuids) {
        try {
            const item = await fromUuid(uuid);
            if (item) {
                _featureCache.set(uuid, item);
                console.log(`DH-Ikonis | Cached feature: ${item.name} [${uuid}]`);
            }
        } catch (e) {
            console.error(`DH-Ikonis | Failed to load feature ${uuid}`, e);
        }
    }
    console.log(`DH-Ikonis | Cache size: ${_featureCache.size}`);
}

/**
 * Robust feature fetching. Tries cache first, then async fromUuid.
 */
export async function getAttachedFeature(uuid) {
    if (!uuid) return null;
    if (_featureCache.has(uuid)) return _featureCache.get(uuid);
    return await fromUuid(uuid);
}

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;
    }
}

/**
 * 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...");

    const originalAllEffects = Actor.prototype.allApplicableEffects;
    Actor.prototype.allApplicableEffects = function* (options) {
        yield* originalAllEffects.call(this, options);

        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;

                // Try cache first, then sync
                const feature = _featureCache.get(aug.featureUuid) || fromUuidSync(aug.featureUuid);
                if (!feature || !feature.effects) continue;

                for (const effect of feature.effects) {
                    if (effect.transfer) {
                        console.log(`DH-Ikonis | Injecting effect '${effect.name}' from augment '${feature.name}' on ${this.name}`);
                        
                        // Clone the effect and set this actor as parent to ensure application
                        const effectData = effect.toObject();
                        effectData.disabled = false;
                        const ActiveEffectClass = getDocumentClass("ActiveEffect");
                        const effectInstance = new ActiveEffectClass(effectData, { parent: this });
                        yield effectInstance;
                    }
                }
            }

            const bondedUuid = item.getFlag('dh-ikonis', 'bondedFeatureUuid');
            if (bondedUuid) {
                const feature = _featureCache.get(bondedUuid) || fromUuidSync(bondedUuid);
                if (feature?.effects) {
                    for (const effect of feature.effects) {
                        if (effect.transfer) {
                            console.log(`DH-Ikonis | Injecting bonded effect '${effect.name}' from '${feature.name}' on ${this.name}`);
                            
                            const effectData = effect.toObject();
                            effectData.disabled = false;
                            const ActiveEffectClass = getDocumentClass("ActiveEffect");
                            const effectInstance = new ActiveEffectClass(effectData, { parent: this });
                            yield effectInstance;
                        }
                    }
                }
            }
        }
    };
}

/**
 * Patches the Character Data Model to show features in the UI lists.
 */
export function patchDhCharacter(DhCharacter) {
    console.log("DH-Ikonis | Applying DhCharacter.sheetLists patch...");
    
    const descriptor = Object.getOwnPropertyDescriptor(DhCharacter.prototype, 'sheetLists');
    if (!descriptor) {
        console.error("DH-Ikonis | FAILED to find sheetLists descriptor on DhCharacter prototype!");
        return;
    }

    const originalSheetLists = descriptor.get;
    Object.defineProperty(DhCharacter.prototype, 'sheetLists', {
        get: function() {
            const lists = originalSheetLists.call(this);
            const ikonisFeatures = [];
            
            if (!this.parent) return lists;

            const weapons = this.parent.items.filter(i => i.type === 'weapon');
            if (weapons.length > 0) {
                console.log(`DH-Ikonis | Checking ${weapons.length} weapons on ${this.parent.name} for augments...`);
            }

            for (const item of weapons) {
                if (!item.system.equipped) continue;

                const installedIds = item.getFlag('dh-ikonis', 'installedAugments') || [];
                const bondedUuid = item.getFlag('dh-ikonis', 'bondedFeatureUuid');

                if (bondedUuid) {
                    const feature = _featureCache.get(bondedUuid) || fromUuidSync(bondedUuid);
                    if (feature) {
                        // Use constructor to ensure compatibility
                        const ItemClass = getDocumentClass("Item");
                        const featureClone = new ItemClass(feature.toObject(), { parent: this.parent });
                        ikonisFeatures.push(featureClone);
                        console.log(`DH-Ikonis | Resolved bonded feature: ${feature.name}`);
                    }
                }

                if (installedIds.length > 0) {
                    console.log(`DH-Ikonis | Found ${installedIds.length} installed augments on ${item.name}`);
                }

                const allAugs = getAugments();
                for (const id of installedIds) {
                    const aug = allAugs.find(a => String(a.id) === String(id));
                    if (!aug?.featureUuid) continue;

                    const feature = _featureCache.get(aug.featureUuid) || fromUuidSync(aug.featureUuid);
                    if (feature) {
                        // Use constructor to ensure compatibility
                        const ItemClass = getDocumentClass("Item");
                        const featureClone = new ItemClass(feature.toObject(), { parent: this.parent });
                        ikonisFeatures.push(featureClone);
                        console.log(`DH-Ikonis | Resolved augment feature: ${feature.name}`);
                    }
                }
            }

            if (ikonisFeatures.length > 0) {
                const uniqueFeatures = Array.from(new Set(ikonisFeatures));
                console.log(`DH-Ikonis | Injecting ${uniqueFeatures.length} features for ${this.parent.name}`);
                
                lists.ikonis = {
                    title: "Ikonis Augments",
                    type: "ikonis",
                    values: uniqueFeatures
                };
            }

            return lists;
        },
        configurable: true
    });
}

export function patchDHWeapon() {
    // Future: Add damage type override logic here
}