/**
 * BuildingRestorationSystem.js
 * ===========================
 * Manages the repair and restoration of ruined buildings in Town Square.
 * 
 * Mechanics:
 * - Buildings start in 'ruined' state.
 * - Players contribute materials (Wood, Stone, Scrap).
 * - Restoration happens in stages.
 * - Restored buildings unlock NPCs and Services.
 */

export default class BuildingRestorationSystem {
    constructor(scene) {
        this.scene = scene;
        this.buildings = new Map();
        this._initBuildings();
    }

    _initBuildings() {
        // Sample restoration targets
        this.buildings.set('blacksmith_shop', {
            name: 'Ivan\'s Blacksmith',
            state: 'ruined',
            progress: 0,
            requirements: { wood: 50, stone: 30, scrap: 10 },
            npc: 'Ivan Kovač',
            unlocked: false
        });

        this.buildings.set('bakery', {
            name: 'Town Bakery',
            state: 'ruined',
            progress: 0,
            requirements: { wood: 40, stone: 20, scrap: 5 },
            npc: 'Marija Pekarka',
            unlocked: false
        });
    }

    contribute(buildingId, material, amount) {
        const b = this.buildings.get(buildingId);
        if (!b) return false;

        if (b.requirements[material] && b.requirements[material] > 0) {
            const used = Math.min(amount, b.requirements[material]);
            b.requirements[material] -= used;

            // Check if all materials are 0
            const allDone = Object.values(b.requirements).every(val => val <= 0);
            if (allDone) {
                this.restore(buildingId);
            }
            return used;
        }
        return 0;
    }

    restore(buildingId) {
        const b = this.buildings.get(buildingId);
        if (!b) return;
        b.state = 'restored';
        b.unlocked = true;
        b.progress = 100;
        console.log(`🏰 ${b.name} has been restored!`);
        this.scene.events.emit('building_restored', b);
    }

    getBuilding(id) {
        return this.buildings.get(id);
    }
}