import * as THREE from 'three';

import { TGALoader } from 'three/addons/loaders/TGALoader.js';

import { AddObjectCommand } from './commands/AddObjectCommand.js';
import { SetSceneCommand } from './commands/SetSceneCommand.js';

import { LoaderUtils } from './LoaderUtils.js';

import { GLTFImportDialog } from './GLTFImportDialog.js';

import { unzipSync, strFromU8 } from 'three/addons/libs/fflate.module.js';

function Loader( editor ) {

	const scope = this;

	this.texturePath = '';

	this.loadItemList = function ( items ) {

		LoaderUtils.getFilesFromItemList( items, function ( files, filesMap ) {

			scope.loadFiles( files, filesMap );

		} );

	};

	this.loadFiles = function ( files, filesMap ) {

		if ( files.length > 0 ) {

			filesMap = filesMap || LoaderUtils.createFilesMap( files );

			const normalizeLookupPath = function ( path ) {

				let normalized = String( path || '' ).replace( /\\/g, '/' );
				const queryIndex = normalized.indexOf( '?' );
				if ( queryIndex !== - 1 ) normalized = normalized.slice( 0, queryIndex );
				const hashIndex = normalized.indexOf( '#' );
				if ( hashIndex !== - 1 ) normalized = normalized.slice( 0, hashIndex );

				while ( normalized.startsWith( './' ) ) normalized = normalized.slice( 2 );
				while ( normalized.startsWith( '../' ) ) normalized = normalized.slice( 3 );
				while ( normalized.startsWith( '/' ) ) normalized = normalized.slice( 1 );

				return normalized;

			};

			const createFileFinder = function ( map ) {

				const suffixMap = {};
				const warnedAmbiguous = new Set();

				const addCandidate = function ( suffix, candidate ) {

					if ( ! suffixMap[ suffix ] ) suffixMap[ suffix ] = [];
					suffixMap[ suffix ].push( candidate );

				};

				for ( const rawKey in map ) {

					const key = normalizeLookupPath( rawKey );
					const file = map[ rawKey ];
					if ( key === '' || ! file ) continue;

					const parts = key.split( '/' );

					for ( let i = 0; i < parts.length; i ++ ) {

						const suffix = parts.slice( i ).join( '/' );
						if ( suffix !== '' ) addCandidate( suffix, { key, file } );

					}

				}

				for ( const suffix in suffixMap ) {

					suffixMap[ suffix ].sort( function ( a, b ) {

						if ( a.key.length !== b.key.length ) return a.key.length - b.key.length;
						if ( a.key < b.key ) return - 1;
						if ( a.key > b.key ) return 1;
						return 0;

					} );

				}

				return function findFile( url ) {

					const lookup = normalizeLookupPath( url );
					if ( lookup === '' ) return null;

					const candidates = suffixMap[ lookup ];
					if ( ! candidates || candidates.length === 0 ) return null;
					if ( candidates.length === 1 ) return candidates[ 0 ];

					for ( let i = 0; i < candidates.length; i ++ ) {

						if ( candidates[ i ].key === lookup ) return candidates[ i ];

					}

					if ( ! warnedAmbiguous.has( lookup ) ) {

						console.warn( 'Loader: Ambiguous file reference "' + lookup + '". Using "' + candidates[ 0 ].key + '".' );
						warnedAmbiguous.add( lookup );

					}

					return candidates[ 0 ];

				};

			};

			const findFile = createFileFinder( filesMap );

			const manager = new THREE.LoadingManager();
			manager.setURLModifier( function ( url ) {

				const resolved = findFile( url );

				if ( resolved ) {

					console.log( 'Loading', url );

					return URL.createObjectURL( resolved.file );

				}

				return url;

			} );

			manager.addHandler( /\.tga$/i, new TGALoader() );

			for ( let i = 0; i < files.length; i ++ ) {

				scope.loadFile( files[ i ], manager );

			}

		}

	};

	this.loadFile = function ( file, manager ) {

		const filename = file.name;
		const extension = filename.split( '.' ).pop().toLowerCase();

		const reader = new FileReader();
		reader.addEventListener( 'progress', function ( event ) {

			const size = '(' + editor.utils.formatNumber( Math.floor( event.total / 1000 ) ) + ' KB)';
			const progress = Math.floor( ( event.loaded / event.total ) * 100 ) + '%';

			console.log( 'Loading', filename, size, progress );

		} );

		switch ( extension ) {

			case '3dm':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { Rhino3dmLoader } = await import( 'three/addons/loaders/3DMLoader.js' );

					const loader = new Rhino3dmLoader();
					loader.setLibraryPath( '../examples/jsm/libs/rhino3dm/' );
					loader.parse( contents, function ( object ) {

						object.name = filename;

						editor.execute( new AddObjectCommand( editor, object ) );

					}, function ( error ) {

						console.error( error );

					} );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case '3ds':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const { TDSLoader } = await import( 'three/addons/loaders/TDSLoader.js' );

					const loader = new TDSLoader();
					const object = loader.parse( event.target.result );

					editor.execute( new AddObjectCommand( editor, object ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case '3mf':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const { ThreeMFLoader } = await import( 'three/addons/loaders/3MFLoader.js' );

					const loader = new ThreeMFLoader();
					const object = loader.parse( event.target.result );

					editor.execute( new AddObjectCommand( editor, object ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'amf':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const { AMFLoader } = await import( 'three/addons/loaders/AMFLoader.js' );

					const loader = new AMFLoader();
					const amfobject = loader.parse( event.target.result );

					editor.execute( new AddObjectCommand( editor, amfobject ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'dae':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { ColladaLoader } = await import( 'three/addons/loaders/ColladaLoader.js' );

					const loader = new ColladaLoader( manager );
					const collada = loader.parse( contents );

					collada.scene.name = filename;

					editor.execute( new AddObjectCommand( editor, collada.scene ) );

				}, false );
				reader.readAsText( file );

				break;

			}

			case 'drc':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { DRACOLoader } = await import( 'three/addons/loaders/DRACOLoader.js' );

					const loader = new DRACOLoader();
					loader.setDecoderPath( '../examples/jsm/libs/draco/' );
					loader.parse( contents, function ( geometry ) {

						let object;

						if ( geometry.index !== null ) {

							const material = new THREE.MeshStandardMaterial();

							object = new THREE.Mesh( geometry, material );
							object.name = filename;

						} else {

							const material = new THREE.PointsMaterial( { size: 0.01 } );
							material.vertexColors = geometry.hasAttribute( 'color' );

							object = new THREE.Points( geometry, material );
							object.name = filename;

						}

						loader.dispose();
						editor.execute( new AddObjectCommand( editor, object ) );

					} );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'fbx':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { FBXLoader } = await import( 'three/addons/loaders/FBXLoader.js' );

					const loader = new FBXLoader( manager );
					const object = loader.parse( contents );

					editor.execute( new AddObjectCommand( editor, object ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'glb':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					try {

						const dialog = new GLTFImportDialog( editor.strings );
						const options = await dialog.show();

						const loader = await createGLTFLoader();

						loader.parse( contents, '', function ( result ) {

							const scene = result.scene;
							scene.name = filename;

							scene.animations.push( ...result.animations );

							if ( options.asScene ) {

								editor.execute( new SetSceneCommand( editor, scene ) );

							} else {

								editor.execute( new AddObjectCommand( editor, scene ) );

							}

							loader.dracoLoader.dispose();
							loader.ktx2Loader.dispose();

						} );

					} catch ( e ) {

						// Import cancelled

					}

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'gltf':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					try {

						const dialog = new GLTFImportDialog( editor.strings );
						const options = await dialog.show();

						const loader = await createGLTFLoader( manager );

						loader.parse( contents, '', function ( result ) {

							const scene = result.scene;
							scene.name = filename;

							scene.animations.push( ...result.animations );

							if ( options.asScene ) {

								editor.execute( new SetSceneCommand( editor, scene ) );

							} else {

								editor.execute( new AddObjectCommand( editor, scene ) );

							}

							loader.dracoLoader.dispose();
							loader.ktx2Loader.dispose();

						} );

					} catch ( e ) {

						// Import cancelled

					}

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'js':
			case 'json':

			{

				reader.addEventListener( 'load', function ( event ) {

					const contents = event.target.result;

					// 2.0

					if ( contents.indexOf( 'postMessage' ) !== - 1 ) {

						const blob = new Blob( [ contents ], { type: 'text/javascript' } );
						const url = URL.createObjectURL( blob );

						const worker = new Worker( url );

						worker.onmessage = function ( event ) {

							event.data.metadata = { version: 2 };
							handleJSON( event.data );

						};

						worker.postMessage( Date.now() );

						return;

					}

					// >= 3.0

					let data;

					try {

						data = JSON.parse( contents );

					} catch ( error ) {

						alert( error );
						return;

					}

					handleJSON( data );

				}, false );
				reader.readAsText( file );

				break;

			}

			case 'kmz':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const { KMZLoader } = await import( 'three/addons/loaders/KMZLoader.js' );

					const loader = new KMZLoader();
					const collada = loader.parse( event.target.result );

					collada.scene.name = filename;

					editor.execute( new AddObjectCommand( editor, collada.scene ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'ldr':
			case 'mpd':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const { LDrawLoader } = await import( 'three/addons/loaders/LDrawLoader.js' );

					const loader = new LDrawLoader();
					loader.setPath( '../../examples/models/ldraw/officialLibrary/' );
					loader.parse( event.target.result, function ( group ) {

						group.name = filename;
						// Convert from LDraw coordinates: rotate 180 degrees around OX
						group.rotation.x = Math.PI;

						editor.execute( new AddObjectCommand( editor, group ) );

					} );

				}, false );
				reader.readAsText( file );

				break;

			}

			case 'md2':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { MD2Loader } = await import( 'three/addons/loaders/MD2Loader.js' );

					const geometry = new MD2Loader().parse( contents );
					const material = new THREE.MeshStandardMaterial();

					const mesh = new THREE.Mesh( geometry, material );
					mesh.mixer = new THREE.AnimationMixer( mesh );
					mesh.name = filename;

					mesh.animations.push( ...geometry.animations );
					editor.execute( new AddObjectCommand( editor, mesh ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'obj':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { OBJLoader } = await import( 'three/addons/loaders/OBJLoader.js' );

					const object = new OBJLoader().parse( contents );
					object.name = filename;

					editor.execute( new AddObjectCommand( editor, object ) );

				}, false );
				reader.readAsText( file );

				break;

			}

			case 'pcd':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { PCDLoader } = await import( 'three/addons/loaders/PCDLoader.js' );

					const points = new PCDLoader().parse( contents );
					points.name = filename;

					editor.execute( new AddObjectCommand( editor, points ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'ply':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { PLYLoader } = await import( 'three/addons/loaders/PLYLoader.js' );

					const geometry = new PLYLoader().parse( contents );
					let object;

					if ( geometry.index !== null ) {

						const material = new THREE.MeshStandardMaterial();

						object = new THREE.Mesh( geometry, material );
						object.name = filename;

					} else {

						const material = new THREE.PointsMaterial( { size: 0.01 } );
						material.vertexColors = geometry.hasAttribute( 'color' );

						object = new THREE.Points( geometry, material );
						object.name = filename;

					}

					editor.execute( new AddObjectCommand( editor, object ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'stl':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { STLLoader } = await import( 'three/addons/loaders/STLLoader.js' );

					const geometry = new STLLoader().parse( contents );
					const material = new THREE.MeshStandardMaterial();

					const mesh = new THREE.Mesh( geometry, material );
					mesh.name = filename;

					editor.execute( new AddObjectCommand( editor, mesh ) );

				}, false );

				if ( reader.readAsBinaryString !== undefined ) {

					reader.readAsBinaryString( file );

				} else {

					reader.readAsArrayBuffer( file );

				}

				break;

			}

			case 'svg':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { SVGLoader } = await import( 'three/addons/loaders/SVGLoader.js' );

					const loader = new SVGLoader();
					const paths = loader.parse( contents ).paths;

					//

					const group = new THREE.Group();
					group.name = filename;
					group.scale.multiplyScalar( 0.1 );
					group.scale.y *= - 1;

					for ( let i = 0; i < paths.length; i ++ ) {

						const path = paths[ i ];

						const material = new THREE.MeshBasicMaterial( {
							color: path.color,
							depthWrite: false
						} );

						const shapes = SVGLoader.createShapes( path );

						for ( let j = 0; j < shapes.length; j ++ ) {

							const shape = shapes[ j ];

							const geometry = new THREE.ShapeGeometry( shape );
							const mesh = new THREE.Mesh( geometry, material );

							group.add( mesh );

						}

					}

					editor.execute( new AddObjectCommand( editor, group ) );

				}, false );
				reader.readAsText( file );

				break;

			}

			case 'usd':
			case 'usda':
			case 'usdc':
			case 'usdz':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { USDLoader } = await import( 'three/addons/loaders/USDLoader.js' );

					const loader = new USDLoader( manager );
					const group = loader.parse( contents );
					group.name = filename;

					editor.execute( new AddObjectCommand( editor, group ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'vox':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { VOXLoader } = await import( 'three/addons/loaders/VOXLoader.js' );

					const { scene } = new VOXLoader().parse( contents );

					scene.name = filename;

					editor.execute( new AddObjectCommand( editor, scene ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'vtk':
			case 'vtp':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { VTKLoader } = await import( 'three/addons/loaders/VTKLoader.js' );

					const geometry = new VTKLoader().parse( contents );
					const material = new THREE.MeshStandardMaterial();

					const mesh = new THREE.Mesh( geometry, material );
					mesh.name = filename;

					editor.execute( new AddObjectCommand( editor, mesh ) );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'wrl':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { VRMLLoader } = await import( 'three/addons/loaders/VRMLLoader.js' );

					const result = new VRMLLoader().parse( contents );

					editor.execute( new AddObjectCommand( editor, result ) );

				}, false );
				reader.readAsText( file );

				break;

			}

			case 'xyz':

			{

				reader.addEventListener( 'load', async function ( event ) {

					const contents = event.target.result;

					const { XYZLoader } = await import( 'three/addons/loaders/XYZLoader.js' );

					const geometry = new XYZLoader().parse( contents );

					const material = new THREE.PointsMaterial();
					material.vertexColors = geometry.hasAttribute( 'color' );

					const points = new THREE.Points( geometry, material );
					points.name = filename;

					editor.execute( new AddObjectCommand( editor, points ) );

				}, false );
				reader.readAsText( file );

				break;

			}

			case 'zip':

			{

				reader.addEventListener( 'load', function ( event ) {

					handleZIP( event.target.result );

				}, false );
				reader.readAsArrayBuffer( file );

				break;

			}

			case 'bmp':
			case 'gif':
			case 'jpg':
			case 'jpeg':
			case 'png':
			case 'tga':

				break; // Image files are handled as textures by other loaders

			default:

				console.error( 'Unsupported file format (' + extension + ').' );

				break;

		}

	};

	function handleJSON( data ) {

		if ( data.metadata === undefined ) { // 2.0

			data.metadata = { type: 'Geometry' };

		}

		if ( data.metadata.type === undefined ) { // 3.0

			data.metadata.type = 'Geometry';

		}

		if ( data.metadata.formatVersion !== undefined ) {

			data.metadata.version = data.metadata.formatVersion;

		}

		switch ( data.metadata.type.toLowerCase() ) {

			case 'buffergeometry':

			{

				const loader = new THREE.BufferGeometryLoader();
				const result = loader.parse( data );

				const mesh = new THREE.Mesh( result );

				editor.execute( new AddObjectCommand( editor, mesh ) );

				break;

			}

			case 'geometry':

				console.error( 'Loader: "Geometry" is no longer supported.' );

				break;

			case 'object':

			{

				const loader = new THREE.ObjectLoader();
				loader.setResourcePath( scope.texturePath );

				loader.parse( data, function ( result ) {

					editor.execute( new AddObjectCommand( editor, result ) );

				} );

				break;

			}

			case 'app':

				editor.fromJSON( data );

				break;

		}

	}

	async function handleZIP( contents ) {

		const zip = unzipSync( new Uint8Array( contents ) );

		const manager = new THREE.LoadingManager();
		manager.setURLModifier( function ( url ) {

			const file = zip[ url ];

			if ( file ) {

				console.log( 'Loading', url );

				const blob = new Blob( [ file.buffer ], { type: 'application/octet-stream' } );
				return URL.createObjectURL( blob );

			}

			return url;

		} );

		// Poly

		if ( zip[ 'model.obj' ] && zip[ 'materials.mtl' ] ) {

			const { MTLLoader } = await import( 'three/addons/loaders/MTLLoader.js' );
			const { OBJLoader } = await import( 'three/addons/loaders/OBJLoader.js' );

			const materials = new MTLLoader( manager ).parse( strFromU8( zip[ 'materials.mtl' ] ) );
			const object = new OBJLoader().setMaterials( materials ).parse( strFromU8( zip[ 'model.obj' ] ) );

			editor.execute( new AddObjectCommand( editor, object ) );
			return;

		}

		//

		for ( const path in zip ) {

			const file = zip[ path ];

			const extension = path.split( '.' ).pop().toLowerCase();

			switch ( extension ) {

				case 'fbx':

				{

					const { FBXLoader } = await import( 'three/addons/loaders/FBXLoader.js' );

					const loader = new FBXLoader( manager );
					const object = loader.parse( file.buffer );

					editor.execute( new AddObjectCommand( editor, object ) );

					break;

				}

				case 'glb':

				{

					try {

						const dialog = new GLTFImportDialog( editor.strings );
						const options = await dialog.show();

						const loader = await createGLTFLoader();

						loader.parse( file.buffer, '', function ( result ) {

							const scene = result.scene;

							scene.animations.push( ...result.animations );

							if ( options.asScene ) {

								editor.execute( new SetSceneCommand( editor, scene ) );

							} else {

								editor.execute( new AddObjectCommand( editor, scene ) );

							}

							loader.dracoLoader.dispose();
							loader.ktx2Loader.dispose();

						} );

					} catch ( e ) {

						// Import cancelled

					}

					break;

				}

				case 'gltf':

				{

					try {

						const dialog = new GLTFImportDialog( editor.strings );
						const options = await dialog.show();

						const loader = await createGLTFLoader( manager );

						loader.parse( strFromU8( file ), '', function ( result ) {

							const scene = result.scene;

							scene.animations.push( ...result.animations );

							if ( options.asScene ) {

								editor.execute( new SetSceneCommand( editor, scene ) );

							} else {

								editor.execute( new AddObjectCommand( editor, scene ) );

							}

							loader.dracoLoader.dispose();
							loader.ktx2Loader.dispose();

						} );

					} catch ( e ) {

						// Import cancelled

					}

					break;

				}

			}

		}

	}

	async function createGLTFLoader( manager ) {

		const { GLTFLoader } = await import( 'three/addons/loaders/GLTFLoader.js' );
		const { DRACOLoader } = await import( 'three/addons/loaders/DRACOLoader.js' );
		const { KTX2Loader } = await import( 'three/addons/loaders/KTX2Loader.js' );
		const { MeshoptDecoder } = await import( 'three/addons/libs/meshopt_decoder.module.js' );

		const dracoLoader = new DRACOLoader();
		dracoLoader.setDecoderPath( '../examples/jsm/libs/draco/gltf/' );

		const ktx2Loader = new KTX2Loader( manager );
		ktx2Loader.setTranscoderPath( '../examples/jsm/libs/basis/' );

		editor.signals.rendererDetectKTX2Support.dispatch( ktx2Loader );

		const loader = new GLTFLoader( manager );
		loader.setDRACOLoader( dracoLoader );
		loader.setKTX2Loader( ktx2Loader );
		loader.setMeshoptDecoder( MeshoptDecoder );

		return loader;

	}

}

export { Loader };