/**
 * ============================================================
 *  InventorySystem.js — Nova Farma
 * ============================================================
 *  Hotbar (7 slotov) + Items logika
 *
 *  DEMO starter items:
 *  Slot 1: 🪓 Motika (Hoe)       → ore tla
 *  Slot 2: 💧 Zalivalka            → zalij crop
 *  Slot 3: 🌾 Pšenica semena ×5
 *  Slot 4: 🥕 Korenje semena ×5
 *  Slot 5: — prazen —
 *  Slot 6: — prazen —
 *  Slot 7: — prazen —
 *
 *  Keys: [1]-[7] za slot, scroll za rotate
 *  Emit 'hotbarChanged' { slot, item } → GrassScene → FarmingSystem
 * ============================================================
 */
export default class InventorySystem {

    /**
     * @param {Phaser.Scene} scene — GrassSceneClean
     */
    constructor(scene) {
        this.scene = scene;

        // Vsi predmeti (full inventory)
        this.items = {};
        // Format: { 'wheat_seed': { name, icon, count, type, tool/seed } }

        // Hotbar = 7 slotov, vsak kaže na item key ali null (začenjamo prazni!)
        this.hotbar = [
            null,
            null,
            null,
            null,
            null,
            null,
            null,
        ];
        this.activeSlot = 0; // Slot 1

        // Item definicije
        this.ITEM_DEFS = {
            hoe: {
                name: 'Motika',
                icon: '🪓',
                type: 'tool',
                tool: 'hoe',
                stackable: false,
                count: 1,
                desc: '[E] Oraj tla',
            },
            watering_can: {
                name: 'Zalivalka',
                icon: '💧',
                type: 'tool',
                tool: 'watering_can',
                stackable: false,
                count: 1,
                desc: '[E] Zalij rastlino',
            },
            axe: {
                name: 'Sekira',
                icon: '🪓',
                type: 'tool',
                tool: 'axe',
                stackable: false,
                count: 1,
                desc: '[M1] Podri drevo',
            },
            wheat_seed: {
                name: 'Pšenica',
                icon: '🌾',
                type: 'seed',
                seed: 'wheat',
                stackable: true,
                count: 5,
                desc: '3 dni • 30g/harvest',
                color: '#ffdd88',
            },
            carrot_seed: {
                name: 'Korenje',
                icon: '🥕',
                type: 'seed',
                seed: 'carrot',
                stackable: true,
                count: 5,
                desc: '4 dni • 40g/harvest',
                color: '#ff8844',
            },
            cannabis_seed: {
                name: 'Konoplja',
                icon: '🌿',
                type: 'seed',
                seed: 'cannabis',
                stackable: true,
                count: 0,
                desc: '[E] Posadi na preorano',
                color: '#88cc44',
                value: 50,
            },
            // Harvested items
            wheat: {
                name: 'Pšenica',
                icon: '🌾',
                type: 'resource',
                stackable: true,
                count: 0,
                value: 30,
            },
            carrot: {
                name: 'Korenje',
                icon: '🥕',
                type: 'resource',
                stackable: true,
                count: 0,
                value: 40,
            },
            cannabis_bud: {
                name: 'Konoplja',
                icon: '🌿',
                type: 'resource',
                stackable: true,
                count: 0,
                value: 200,
            },
            wood: {
                name: 'Les',
                icon: '🪵',
                type: 'resource',
                stackable: true,
                count: 0,
                value: 10,
            },
        };

        // Inicializiraj items iz ITEM_DEFS (samo tiste s count > 0)
        for (const [key, def] of Object.entries(this.ITEM_DEFS)) {
            this.items[key] = { ...def };
        }

        // Denar (Gold)
        this.gold = 0;

        // Number keys [1]-[7]
        for (let i = 1; i <= 7; i++) {
            scene.input.keyboard.on(`keydown-${i}`, () => this.selectSlot(i - 1));
        }

        // Scroll wheel za rotation
        scene.input.on('wheel', (pointer, gObj, dx, dy) => {
            if (dy > 0) this.selectSlot((this.activeSlot + 1) % 7);
            else if (dy < 0) this.selectSlot((this.activeSlot + 6) % 7);
        });

        // Poslušaj harvest evente → dodaj v inventar
        scene.events.on('harvest', (data) => {
            this.addItem(data.item, data.count);
            this.addGold(data.value);
        });

        // Prvič sinhronizira z FarmingSystem
        this._syncWithFarming();

        console.log('🎒 InventorySystem initialized');
    }

    // ─────────────────────────────────────────────────────────────────────────
    //  IZBERI SLOT
    // ─────────────────────────────────────────────────────────────────────────
    selectSlot(index) {
        if (index < 0 || index >= 7) return;
        this.activeSlot = index;
        this._syncWithFarming();
        this._notifyUI();
        console.log(`🎒 Slot ${index + 1}: ${this.hotbar[index] || 'prazen'}`);
    }

    // ─────────────────────────────────────────────────────────────────────────
    //  DODAJ ITEM
    // ─────────────────────────────────────────────────────────────────────────
    addItem(key, count = 1) {
        if (!this.items[key]) {
            this.items[key] = { ...(this.ITEM_DEFS[key] || { name: key, icon: '📦', count: 0 }) };
        }
        this.items[key].count += count;

        // Dodaj v hotbar če je prazen slot in item še ni v hotbaru
        const def = this.ITEM_DEFS[key];
        if (def && !this.hotbar.includes(key)) {
            const emptySlot = this.hotbar.findIndex(s => s === null);
            if (emptySlot !== -1) this.hotbar[emptySlot] = key;
        }

        this._notifyUI();
        console.log(`🎒 +${count}× ${key} (skupaj: ${this.items[key].count})`);
    }

    addGold(amount) {
        this.gold += amount;
        this._notifyUI();
        console.log(`💰 +${amount}g (skupaj: ${this.gold}g)`);
    }

    deductItem(key, amount) {
        if (!this.items[key] || this.items[key].count < amount) return false;

        this.items[key].count -= amount;

        // Če je stackable in gre na 0, odstrani tudi iz hotbara
        if (this.items[key].count <= 0 && this.items[key].stackable) {
            const index = this.hotbar.indexOf(key);
            if (index !== -1) {
                this.hotbar[index] = null;
            }
        }

        this._notifyUI();
        return true;
    }

    // ─────────────────────────────────────────────────────────────────────────
    //  PORABI ITEM (semena pri sajenju)
    // ─────────────────────────────────────────────────────────────────────────
    useActiveItem() {
        const key = this.hotbar[this.activeSlot];
        if (!key) return false;
        const item = this.items[key];
        if (!item) return false;

        if (item.type === 'seed') {
            if (item.count <= 0) {
                this._showMsg(`❌ Ni ${item.name} semen!`, '#ff6666');
                return false;
            }
            item.count--;
            if (item.count <= 0 && item.stackable) {
                // Odstrani iz hotbara
                this.hotbar[this.activeSlot] = null;
            }
            this._notifyUI();
            return true;
        }

        if (item.type === 'tool') return true; // Orodja se ne porabijo

        return false;
    }

    // ─────────────────────────────────────────────────────────────────────────
    //  SYNC z FarmingSystem
    // ─────────────────────────────────────────────────────────────────────────
    _syncWithFarming() {
        const farming = this.scene.farmingSystem;
        if (!farming) return;

        const key = this.hotbar[this.activeSlot];
        if (!key) {
            farming.setTool(null);
            return;
        }

        const item = this.items[key];
        if (!item) return;

        if (item.type === 'tool') {
            farming.setTool(item.tool);
            farming.setSeed(null);
        } else if (item.type === 'seed') {
            farming.setTool('hoe'); // Semena → avtomatsko orodje = motika za saditev
            farming.setSeed(item.seed);
        } else {
            farming.setTool(null);
            farming.setSeed(null);
        }
    }

    // ─────────────────────────────────────────────────────────────────────────
    //  NOTIFY UIScene
    // ─────────────────────────────────────────────────────────────────────────
    _notifyUI() {
        const uiScene = this.scene.scene.get('UIScene');
        if (!uiScene) return;

        // Pošlji hotbar stanje
        const hotbarData = this.hotbar.map((key, i) => {
            if (!key) return null;
            const item = this.items[key];
            const def = this.ITEM_DEFS[key];
            return {
                key,
                icon: def?.icon || '📦',
                name: def?.name || key,
                count: item?.count ?? 1,
                active: i === this.activeSlot,
                type: def?.type || 'unknown',
                stackable: def?.stackable || false,
            };
        });

        uiScene.events.emit('hotbarUpdate', {
            slots: hotbarData,
            activeSlot: this.activeSlot,
            gold: this.gold,
        });
    }

    _showMsg(msg, color = '#ffffff') {
        const cam = this.scene.cameras.main;
        const txt = this.scene.add.text(
            cam.worldView.centerX,
            cam.worldView.top + 80,
            msg, {
            fontFamily: 'Arial Black',
            fontSize: '20px',
            color,
            stroke: '#000000',
            strokeThickness: 4,
        }
        ).setOrigin(0.5).setDepth(9999);

        this.scene.tweens.add({
            targets: txt,
            y: txt.y - 40,
            alpha: { from: 1, to: 0 },
            duration: 1500,
            onComplete: () => txt.destroy(),
        });
    }

    // ─────────────────────────────────────────────────────────────────────────
    //  PUBLIC API
    // ─────────────────────────────────────────────────────────────────────────
    getActiveItem() {
        const key = this.hotbar[this.activeSlot];
        return key ? this.items[key] : null;
    }

    getActiveItemKey() {
        return this.hotbar[this.activeSlot];
    }

    getCount(key) {
        return this.items[key]?.count || 0;
    }

    getGold() {
        return this.gold;
    }

    getState() {
        return {
            items: this.items,
            hotbar: this.hotbar,
            activeSlot: this.activeSlot,
            gold: this.gold,
        };
    }
}