/**
 * Workshop scene — room geometry, lighting, materials.
 *
 * A dark stone room with a wooden desk, crystal ball, fireplace glow,
 * and faint emerald ambient light. This is Timmy's Workshop.
 */

import * as THREE from "https://cdn.jsdelivr.net/npm/three@0.160.0/build/three.module.js";

const WALL_COLOR = 0x2a2a3e;
const FLOOR_COLOR = 0x1a1a1a;
const DESK_COLOR = 0x3e2723;
const DESK_TOP_COLOR = 0x4e342e;
const BOOK_COLORS = [0x8b1a1a, 0x1a3c6e, 0x2e5e3e, 0x6e4b1a, 0x4a1a5e, 0x5e1a2e];
const CANDLE_WAX = 0xe8d8b8;
const CANDLE_FLAME = 0xffaa33;

/**
 * Build the room and add it to the given scene.
 * Returns { crystalBall } for animation.
 */
export function buildRoom(scene) {
    // --- Floor ---
    const floorGeo = new THREE.PlaneGeometry(8, 8);
    const floorMat = new THREE.MeshStandardMaterial({
        color: FLOOR_COLOR,
        roughness: 0.9,
    });
    const floor = new THREE.Mesh(floorGeo, floorMat);
    floor.rotation.x = -Math.PI / 2;
    floor.receiveShadow = true;
    scene.add(floor);

    // --- Back wall ---
    const wallGeo = new THREE.PlaneGeometry(8, 4);
    const wallMat = new THREE.MeshStandardMaterial({
        color: WALL_COLOR,
        roughness: 0.95,
        metalness: 0.05,
    });
    const backWall = new THREE.Mesh(wallGeo, wallMat);
    backWall.position.set(0, 2, -4);
    scene.add(backWall);

    // --- Side walls ---
    const leftWall = new THREE.Mesh(wallGeo, wallMat);
    leftWall.position.set(-4, 2, 0);
    leftWall.rotation.y = Math.PI / 2;
    scene.add(leftWall);

    const rightWall = new THREE.Mesh(wallGeo, wallMat);
    rightWall.position.set(4, 2, 0);
    rightWall.rotation.y = -Math.PI / 2;
    scene.add(rightWall);

    // --- Desk ---
    // Table top
    const topGeo = new THREE.BoxGeometry(1.8, 0.08, 0.9);
    const topMat = new THREE.MeshStandardMaterial({
        color: DESK_TOP_COLOR,
        roughness: 0.6,
    });
    const tableTop = new THREE.Mesh(topGeo, topMat);
    tableTop.position.set(0, 0.85, -0.3);
    tableTop.castShadow = true;
    scene.add(tableTop);

    // Legs
    const legGeo = new THREE.BoxGeometry(0.08, 0.85, 0.08);
    const legMat = new THREE.MeshStandardMaterial({
        color: DESK_COLOR,
        roughness: 0.7,
    });
    const offsets = [
        [-0.8, -0.35],
        [0.8, -0.35],
        [-0.8, 0.05],
        [0.8, 0.05],
    ];
    for (const [x, z] of offsets) {
        const leg = new THREE.Mesh(legGeo, legMat);
        leg.position.set(x, 0.425, z - 0.3);
        scene.add(leg);
    }

    // --- Scrolls / papers on desk (simple flat boxes) ---
    const paperGeo = new THREE.BoxGeometry(0.3, 0.005, 0.2);
    const paperMat = new THREE.MeshStandardMaterial({
        color: 0xd4c5a0,
        roughness: 0.9,
    });
    const paper1 = new THREE.Mesh(paperGeo, paperMat);
    paper1.position.set(-0.4, 0.895, -0.35);
    paper1.rotation.y = 0.15;
    scene.add(paper1);

    const paper2 = new THREE.Mesh(paperGeo, paperMat);
    paper2.position.set(0.5, 0.895, -0.2);
    paper2.rotation.y = -0.3;
    scene.add(paper2);

    // --- Crystal ball ---
    const ballGeo = new THREE.SphereGeometry(0.12, 16, 14);
    const ballMat = new THREE.MeshPhysicalMaterial({
        color: 0x88ccff,
        roughness: 0.05,
        metalness: 0.0,
        transmission: 0.9,
        thickness: 0.3,
        transparent: true,
        opacity: 0.7,
        emissive: new THREE.Color(0x88ccff),
        emissiveIntensity: 0.3,
    });
    const crystalBall = new THREE.Mesh(ballGeo, ballMat);
    crystalBall.position.set(0.15, 1.01, -0.3);
    scene.add(crystalBall);

    // Crystal ball base
    const baseGeo = new THREE.CylinderGeometry(0.08, 0.1, 0.04, 8);
    const baseMat = new THREE.MeshStandardMaterial({
        color: 0x444444,
        roughness: 0.3,
        metalness: 0.5,
    });
    const base = new THREE.Mesh(baseGeo, baseMat);
    base.position.set(0.15, 0.9, -0.3);
    scene.add(base);

    // Crystal ball inner glow (pulsing)
    const crystalLight = new THREE.PointLight(0x88ccff, 0.3, 2);
    crystalLight.position.copy(crystalBall.position);
    scene.add(crystalLight);

    // --- Bookshelf (right wall) ---
    const shelfMat = new THREE.MeshStandardMaterial({
        color: DESK_COLOR,
        roughness: 0.7,
    });

    // Bookshelf frame — tall backing panel
    const shelfBack = new THREE.Mesh(
        new THREE.BoxGeometry(1.4, 2.2, 0.06),
        shelfMat
    );
    shelfBack.position.set(3.0, 1.1, -2.0);
    scene.add(shelfBack);

    // Shelves (4 horizontal planks)
    const shelfGeo = new THREE.BoxGeometry(1.4, 0.04, 0.35);
    const shelfYs = [0.2, 0.7, 1.2, 1.7];
    for (const sy of shelfYs) {
        const shelf = new THREE.Mesh(shelfGeo, shelfMat);
        shelf.position.set(3.0, sy, -1.85);
        scene.add(shelf);
    }

    // Side panels
    const sidePanelGeo = new THREE.BoxGeometry(0.04, 2.2, 0.35);
    for (const sx of [-0.68, 0.68]) {
        const side = new THREE.Mesh(sidePanelGeo, shelfMat);
        side.position.set(3.0 + sx, 1.1, -1.85);
        scene.add(side);
    }

    // Books on shelves — colored boxes
    const bookGeo = new THREE.BoxGeometry(0.08, 0.28, 0.22);
    const booksPerShelf = [5, 4, 5, 3];
    for (let s = 0; s < shelfYs.length; s++) {
        const count = booksPerShelf[s];
        const startX = 3.0 - (count * 0.12) / 2;
        for (let b = 0; b < count; b++) {
            const bookMat = new THREE.MeshStandardMaterial({
                color: BOOK_COLORS[(s * 3 + b) % BOOK_COLORS.length],
                roughness: 0.8,
            });
            const book = new THREE.Mesh(bookGeo, bookMat);
            book.position.set(
                startX + b * 0.14,
                shelfYs[s] + 0.16,
                -1.85
            );
            // Slight random tilt for character
            book.rotation.z = (Math.random() - 0.5) * 0.08;
            scene.add(book);
        }
    }

    // --- Candles ---
    const candleLights = [];
    const candlePositions = [
        [-0.6, 0.89, -0.15],   // desk left
        [0.7, 0.89, -0.4],     // desk right
        [3.0, 1.78, -1.85],    // bookshelf top
    ];
    const candleGeo = new THREE.CylinderGeometry(0.02, 0.025, 0.12, 6);
    const candleMat = new THREE.MeshStandardMaterial({
        color: CANDLE_WAX,
        roughness: 0.9,
    });

    for (const [cx, cy, cz] of candlePositions) {
        // Wax cylinder
        const candle = new THREE.Mesh(candleGeo, candleMat);
        candle.position.set(cx, cy + 0.06, cz);
        scene.add(candle);

        // Flame — tiny emissive sphere
        const flameGeo = new THREE.SphereGeometry(0.015, 6, 4);
        const flameMat = new THREE.MeshBasicMaterial({ color: CANDLE_FLAME });
        const flame = new THREE.Mesh(flameGeo, flameMat);
        flame.position.set(cx, cy + 0.13, cz);
        scene.add(flame);

        // Warm point light
        const candleLight = new THREE.PointLight(0xff8833, 0.4, 3);
        candleLight.position.set(cx, cy + 0.15, cz);
        scene.add(candleLight);
        candleLights.push(candleLight);
    }

    // --- Lighting ---

    // Fireplace glow (warm, off-screen stage left)
    const fireLight = new THREE.PointLight(0xff6622, 1.2, 8);
    fireLight.position.set(-3.5, 1.2, -1.0);
    fireLight.castShadow = true;
    fireLight.shadow.mapSize.width = 512;
    fireLight.shadow.mapSize.height = 512;
    scene.add(fireLight);

    // Secondary warm fill
    const fillLight = new THREE.PointLight(0xff8844, 0.3, 6);
    fillLight.position.set(-2.0, 0.5, 1.0);
    scene.add(fillLight);

    // Emerald ambient
    const ambient = new THREE.AmbientLight(0x00b450, 0.15);
    scene.add(ambient);

    // Faint overhead to keep things readable
    const overhead = new THREE.PointLight(0x887766, 0.2, 8);
    overhead.position.set(0, 3.5, 0);
    scene.add(overhead);

    return { crystalBall, crystalLight, fireLight, candleLights };
}