import VillagePathfinder from './pathfinding.js';
import { VillagerBehaviorTree } from './behavior.js';
import CrowdManager from './crowd.js';
import { DailyRoutineManager, Villager } from './routines.js';
import { EnvironmentInteractionSystem, Resource, Building } from './environment.js';
import { AIEntityManager } from './optimization.js';

/**
 * Main AI System for Medieval Village Simulator
 * 
 * This file integrates all AI components into a cohesive system for managing
 * villager AI in a medieval town simulator.
 */

class VillageAISystem {
    constructor(scene) {
        this.scene = scene;
        this.pathfinder = new VillagePathfinder();
        this.crowdManager = new CrowdManager();
        this.routineManager = new DailyRoutineManager();
        this.environmentSystem = new EnvironmentInteractionSystem();
        this.entityManager = new AIEntityManager();

        // Initialize systems
        this.initSystems();
    }

    /**
     * Initialize all AI systems
     */
    initSystems() {
        // Initialize pathfinding with a simple plane for now
        // In a real implementation, this would use a navigation mesh
        // Note: We're not using THREE.js directly in the AI system anymore
        // The nav mesh is just a placeholder object
        this.pathfinder.initNavMesh({});
        
        // Create some sample resources
        this.createSampleResources();
        
        // Create some sample buildings
        this.createSampleBuildings();
    }

    /**
     * Create sample resources for the village
     */
    createSampleResources() {
        const woodResource = new Resource('wood1', 'wood', [10, 0, 10], 100);
        const stoneResource = new Resource('stone1', 'stone', [-10, 0, -10], 100);
        const foodResource = new Resource('food1', 'food', [0, 0, 15], 100);
        
        this.environmentSystem.addResource('wood1', woodResource);
        this.environmentSystem.addResource('stone1', stoneResource);
        this.environmentSystem.addResource('food1', foodResource);
    }

    /**
     * Create sample buildings for the village
     */
    createSampleBuildings() {
        // Create a proper square village layout with buildings around a central square
        const squareSize = 20; // Size of the central square
        const buildingSpacing = 8; // Distance between buildings
        let buildingId = 1;

        // Define building types and their positions around the square
        const buildingConfigs = [
            { type: 'university', x: -squareSize, z: -squareSize, maxOccupancy: 8, useRadius: 6 },
            { type: 'store', x: squareSize, z: -squareSize, maxOccupancy: 4, useRadius: 4 },
            { type: 'bank', x: -squareSize, z: squareSize, maxOccupancy: 3, useRadius: 4 },
            { type: 'hospital', x: squareSize, z: squareSize, maxOccupancy: 5, useRadius: 5 },
            { type: 'market', x: 0, z: -squareSize - buildingSpacing, maxOccupancy: 10, useRadius: 8 },
            { type: 'restaurant', x: 0, z: squareSize + buildingSpacing, maxOccupancy: 6, useRadius: 5 },
            { type: 'workshop', x: -squareSize - buildingSpacing, z: 0, maxOccupancy: 4, useRadius: 4 },
            { type: 'house', x: squareSize + buildingSpacing, z: 0, maxOccupancy: 3, useRadius: 3 }
        ];

        // Add buildings around the square
        buildingConfigs.forEach(config => {
            const building = new Building(`building${buildingId}`, config.type, [config.x, 0, config.z]);
            building.maxOccupancy = config.maxOccupancy;
            building.useRadius = config.useRadius;
            this.environmentSystem.addBuilding(`building${buildingId}`, building);
            buildingId++;
        });

        // Add houses around the perimeter
        const housePositions = [
            [-squareSize, 0, -squareSize + buildingSpacing],
            [-squareSize + buildingSpacing, 0, -squareSize],
            [squareSize - buildingSpacing, 0, -squareSize],
            [squareSize, 0, -squareSize + buildingSpacing],
            [-squareSize, 0, squareSize - buildingSpacing],
            [-squareSize + buildingSpacing, 0, squareSize],
            [squareSize - buildingSpacing, 0, squareSize],
            [squareSize, 0, squareSize - buildingSpacing]
        ];

        housePositions.forEach((pos, index) => {
            const house = new Building(`house${index + 1}`, 'house', pos);
            house.maxOccupancy = 3;
            house.useRadius = 3;
            this.environmentSystem.addBuilding(`house${index + 1}`, house);
        });

        // Add some resources scattered around
        const resources = [
            new Resource('wood1', 'wood', [-squareSize - 5, 0, -squareSize - 5], 100),
            new Resource('wood2', 'wood', [squareSize + 5, 0, squareSize + 5], 100),
            new Resource('stone1', 'stone', [-squareSize - 5, 0, squareSize + 5], 100),
            new Resource('stone2', 'stone', [squareSize + 5, 0, -squareSize - 5], 100),
            new Resource('food1', 'food', [0, 0, -squareSize - 10], 100),
            new Resource('food2', 'food', [0, 0, squareSize + 10], 100)
        ];

        resources.forEach(resource => {
            this.environmentSystem.addResource(resource.id, resource);
        });
    }

    /**
     * Create a villager and add it to the simulation
     * @param {string} id - Villager ID
     * @param {Array} position - Initial position [x, y, z]
     * @returns {Villager} Created villager
     */
    createVillager(id, position) {
        // Convert THREE.Vector3 to array if needed
        let posArray = position;
        if (position && typeof position.x !== 'undefined') {
            posArray = [position.x, position.y, position.z];
        }
        
        const villager = new Villager(id, posArray);

        // Add to systems
        this.crowdManager.addVillager(villager);
        this.entityManager.addEntity(villager);

        // Create a schedule for the villager
        const workBuilding = this.environmentSystem.findNearestBuilding(posArray, 'workshop');
        const homeBuilding = this.environmentSystem.findNearestBuilding(posArray, 'house');
        const marketBuilding = this.environmentSystem.findNearestBuilding(posArray, 'market');
        
        const workLocation = workBuilding ? workBuilding.position : [0, 0, 0];
        const homeLocation = homeBuilding ? homeBuilding.position : [0, 0, 0];
        const socialLocations = marketBuilding ? [marketBuilding.position] : [[0, 0, 0]];

        this.routineManager.createDefaultSchedule(id, workLocation, homeLocation, socialLocations);

        return villager;
    }

    /**
     * Update the AI system
     * @param {number} deltaTime - Time since last frame
     */
    update(deltaTime) {
        // Update routine manager
        this.routineManager.update(deltaTime);
        
        // Update entity manager (includes optimization techniques)
        this.entityManager.update(deltaTime);
        
        // Update crowd manager
        this.crowdManager.update(deltaTime);
        
        // Update each villager
        for (const villager of this.crowdManager.villagers) {
            // Update villager with routine manager and pathfinder
            villager.update(this.routineManager, this.pathfinder, deltaTime);
            
            // Handle environmental interactions
            if (villager.state === 'work' && villager.path.length === 0) {
                // Try to gather resources
                const nearestWood = this.environmentSystem.findNearestResource(villager.position, 'wood');
                if (nearestWood && this.environmentSystem.calculateDistance(villager.position, nearestWood.position) <= nearestWood.gatherRadius) {
                    this.environmentSystem.gatherResource(villager, nearestWood);
                }
            }
            
            if (villager.state === 'socialize' && villager.path.length === 0) {
                // Try to use market
                const market = this.environmentSystem.findNearestBuilding(villager.position, 'market');
                if (market) {
                    this.environmentSystem.useBuilding(villager, market);
                }
            }
            
            // Move along path if there is one
            if (villager.path.length > 0) {
                this.pathfinder.moveAlongPath(villager, villager.path, villager.maxSpeed, deltaTime);
            }
        }
    }
}

export default VillageAISystem;