const BlockType = require('../../extension-support/block-type');
const ArgumentType = require('../../extension-support/argument-type');
const { validateArray } = require('../../util/json-block-utilities');
const AHHHHHHHHHHHHHH = require('../../util/array buffer');
const BufferStuff = new AHHHHHHHHHHHHHH();

/**
 * Class for File blocks
 * @constructor
 */
class JgFilesBlocks {
    constructor (runtime) {
        /**
         * The runtime instantiating this block package.
         * @type {Runtime}
         */
        this.runtime = runtime;
    }

    /**
     * @returns {object} metadata for this extension and its blocks.
     */
    getInfo () {
        return {
            id: 'jgFiles',
            name: 'Files (legacy)',
            color1: '#ffbb00',
            color2: '#ffaa00',
            // docsURI: 'https://docs.turbowarp.org/blocks',
            blocks: [
                {
                    opcode: 'isFileReaderSupported',
                    text: 'can files be used?',
                    disableMonitor: false,
                    blockType: BlockType.BOOLEAN
                },
                {
                    opcode: 'askUserForFileOfType',
                    text: 'ask user for a file of type [FILE_TYPE]',
                    disableMonitor: true,
                    blockType: BlockType.REPORTER,
                    arguments: {
                        FILE_TYPE: {
                            type: ArgumentType.STRING,
                            defaultValue: 'txt savefile'
                        }
                    }
                },
                {
                    opcode: 'askUserForFileOfTypeAsArrayBuffer',
                    text: 'ask user for an array buffer file of type [FILE_TYPE]',
                    disableMonitor: true,
                    blockType: BlockType.REPORTER,
                    arguments: {
                        FILE_TYPE: {
                            type: ArgumentType.STRING,
                            defaultValue: 'txt savefile'
                        }
                    }
                },
                {
                    opcode: 'askUserForFileOfTypeAsDataUri',
                    text: 'ask user for a data uri file of type [FILE_TYPE]',
                    disableMonitor: true,
                    blockType: BlockType.REPORTER,
                    arguments: {
                        FILE_TYPE: {
                            type: ArgumentType.STRING,
                            defaultValue: 'png'
                        }
                    }
                },
                {
                    opcode: 'downloadFile',
                    text: 'download content [FILE_CONTENT] as file name [FILE_NAME]',
                    blockType: BlockType.COMMAND,
                    arguments: {
                        FILE_CONTENT: {
                            type: ArgumentType.STRING,
                            defaultValue: 'Hello!'
                        },
                        FILE_NAME: {
                            type: ArgumentType.STRING,
                            defaultValue: 'text.txt'
                        }
                    }
                },
                {
                    opcode: 'downloadFileDataUri',
                    text: 'download data uri [FILE_CONTENT] as file name [FILE_NAME]',
                    blockType: BlockType.COMMAND,
                    arguments: {
                        FILE_CONTENT: {
                            type: ArgumentType.STRING,
                            defaultValue: 'data:image/png;base64,'
                        },
                        FILE_NAME: {
                            type: ArgumentType.STRING,
                            defaultValue: 'content.png'
                        }
                    }
                },
                {
                    opcode: 'downloadFileBuffer',
                    text: 'download array buffer [FILE_CONTENT] as file name [FILE_NAME]',
                    blockType: BlockType.COMMAND,
                    arguments: {
                        FILE_CONTENT: {
                            type: ArgumentType.STRING,
                            defaultValue: '[]'
                        },
                        FILE_NAME: {
                            type: ArgumentType.STRING,
                            defaultValue: 'data.bin'
                        }
                    }
                }
            ]
        };
    }

    isFileReaderSupported () {
        return (window.FileReader !== null) && (window.document !== null);
    }

    dataURLtoBlob(dataurl) {
        var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
            bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
        while (n--) {
            u8arr[n] = bstr.charCodeAt(n);
        }
        return new Blob([u8arr], { type: mime });
    }

    __askUserForFile (acceptTypes) {
        try {
            return new Promise(resolve => {
                const fileReader = new FileReader();
                fileReader.onload = e => {
                    resolve(e.target.result);
                };
                const input = document.createElement("input");
                input.type = "file";
                if (acceptTypes !== null) {
                    input.accept = acceptTypes;
                }
                input.style.display = "none";
                document.body.append(input);
                input.onchange = () => {
                    const file = input.files[0];
                    if (!file) {
                        resolve("");
                        return;
                    }
                    fileReader.readAsText(file);

                    input.remove();
                };
                input.onblur = () => {
                    input.onchange();
                };
                input.focus();
                input.click();
            });
        } catch (e) {
            return;
        }
    }
    __askUserForFilearraybuffer (acceptTypes) {
        try {
            return new Promise(resolve => {
                const fileReader = new FileReader();
                fileReader.onload = e => {
                    resolve(JSON.stringify(BufferStuff.bufferToArray(e.target.result)));
                };
                const input = document.createElement("input");
                input.type = "file";
                if (acceptTypes !== null) {
                    input.accept = acceptTypes;
                }
                input.style.display = "none";
                document.body.append(input);
                input.onchange = () => {
                    const file = input.files[0];
                    if (!file) {
                        resolve("");
                        return;
                    }
                    fileReader.readAsArrayBuffer(file);

                    input.remove();
                };
                input.onblur = () => {
                    input.onchange();
                };
                input.focus();
                input.click();
            });
        } catch (e) {
            return;
        }
    }
    __askUserForFiledatauri (acceptTypes) {
        try {
            return new Promise(resolve => {
                const fileReader = new FileReader();
                fileReader.onload = e => {
                    resolve(e.target.result);
                };
                const input = document.createElement("input");
                input.type = "file";
                if (acceptTypes !== null) {
                    input.accept = acceptTypes;
                }
                input.style.display = "none";
                document.body.append(input);
                input.onchange = () => {
                    const file = input.files[0];
                    if (!file) {
                        resolve("");
                        return;
                    }
                    fileReader.readAsDataURL(file);

                    input.remove();
                };
                input.onblur = () => {
                    input.onchange();
                };
                input.focus();
                input.click();
            });
        } catch (e) {
            return;
        }
    }

    askUserForFileOfType (args) {
        const fileTypesAllowed = [];
        const input = args.FILE_TYPE
            .toLowerCase()
            .replace(/.,/gmi, "");
        if (input === "any") return this.__askUserForFile(null);
        input.split(" ").forEach(type => {
            fileTypesAllowed.push(`.${type}`);
        });
        return this.__askUserForFile(fileTypesAllowed.join(","), false);
    }
    askUserForFileOfTypeAsArrayBuffer (args) {
        const fileTypesAllowed = [];
        const input = args.FILE_TYPE
            .toLowerCase()
            .replace(/.,/gmi, "");
        if (input === "any") return this.__askUserForFilearraybuffer(null);
        input.split(" ").forEach(type => {
            fileTypesAllowed.push(`.${type}`);
        });
        return this.__askUserForFilearraybuffer(fileTypesAllowed.join(","));
    }
    askUserForFileOfTypeAsDataUri (args) {
        const fileTypesAllowed = [];
        const input = args.FILE_TYPE
            .toLowerCase()
            .replace(/.,/gmi, "");
        if (input === "any") return this.__askUserForFiledatauri(null);
        input.split(" ").forEach(type => {
            fileTypesAllowed.push(`.${type}`);
        });
        return this.__askUserForFiledatauri(fileTypesAllowed.join(","));
    }

    downloadFile (args, _, __, downloadArray, downloadBase64) {
        let content = "";
        let fileName = "text.txt";

        content = String(args.FILE_CONTENT) || content;
        fileName = String(args.FILE_NAME) || fileName;

        const array = validateArray(args.FILE_CONTENT);
        if (array.isValid && downloadArray) {
            content = BufferStuff.arrayToBuffer(array.array);
        }

        let blob;
        if (downloadBase64) {
            blob = this.dataURLtoBlob(content);
        } else {
            blob = new Blob([content]);
        }
        const a = document.createElement("a");
        a.style.display = "none";
        document.body.append(a);
        const url = window.URL.createObjectURL(blob);
        a.href = url;
        a.download = fileName;
        a.click();
        window.URL.revokeObjectURL(url);
        a.remove();
    }
    downloadFileDataUri(args) {
        return this.downloadFile(args, null, null, false, true);
    }
    downloadFileBuffer(args) {
        return this.downloadFile(args, null, null, true, false);
    }
}

module.exports = JgFilesBlocks;