import * as fmc from "../../../disk/fileModelCache";
import * as fsu from "../../../utils/fsu";
import fs = require('fs');
import * as json from "../../../../common/json";
import { reverseKeysAndValues, uniq, extend, isJs } from "../../../../common/utils";
import { makeBlandError, PackageJsonParsed, TsconfigJsonParsed, TypeScriptConfigFileDetails } from "../../../../common/types";
import { increaseCompilationContext, getDefinitionsForNodeModules } from "./compilationContextExpander";
import { validate } from "./tsconfigValidation";
import * as types from '../../../../common/types';

/**
 * The CompilerOptions as read from a `tsconfig.json` file.
 * Most members copy pasted from ts.CompilerOptions
 * - With few (e.g. `module`) replaced with `string`
 * NOTE: see the changes in `types.ts` in the TypeScript sources to see what needs updating
 *
 * When adding you need to
 *  0 Add in this interface
 * 	1 Add to `tsconfigValidation`
 * 	2 If its an enum : Update `typescriptEnumMap`
 * 	3 If its a path : Update `pathResolveTheseOptions`
 * 	4 Update the tsconfig.json file `properties` in schema from https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/tsconfig.json
 */
interface CompilerOptions {
    allowJs?: boolean;
    allowNonTsExtensions?: boolean;
    allowSyntheticDefaultImports?: boolean;
    allowUnreachableCode?: boolean;
    allowUnusedLabels?: boolean;
    baseUrl?: string;
    charset?: string;
    checkJs?: boolean;
    codepage?: number;
    declaration?: boolean;
    declarationDir?: string;
    diagnostics?: boolean;
    emitBOM?: boolean;
    experimentalAsyncFunctions?: boolean;
    experimentalDecorators?: boolean;
    emitDecoratorMetadata?: boolean;
    forceConsistentCasingInFileNames?: boolean;
    help?: boolean;
    isolatedModules?: boolean;
    init?: boolean;
    inlineSourceMap?: boolean;
    inlineSources?: boolean;
    jsx?: string;
    locale?: string;
    lib?: string[];
    list?: string[];
    listEmittedFiles?: boolean;
    listFiles?: boolean;
    mapRoot?: string;
    module?: string;
    moduleResolution?: string;
    newLine?: string;
    noEmit?: boolean;
    noEmitHelpers?: boolean;
    noEmitOnError?: boolean;
    noErrorTruncation?: boolean;
    noFallthroughCasesInSwitch?: boolean;
    noImplicitAny?: boolean;
    noImplicitReturns?: boolean;
    noImplicitThis?: boolean
    noImplicitUseStrict?: boolean;
    noLib?: boolean;
    noLibCheck?: boolean;
    noResolve?: boolean;
    noUnusedParameters?: boolean;
    noUnusedLocals?: boolean;
    out?: string;
    outFile?: string;
    outDir?: string;
    paths?: ts.Map<string[]>;
    preserveConstEnums?: boolean;
    pretty?: string;
    reactNamespace?: string;
    removeComments?: boolean;
    rootDir?: string;
    rootDirs?: string[];
    skipDefaultLibCheck?: boolean;
    skipLibCheck?: boolean;
    sourceMap?: boolean;
    sourceRoot?: string;
    strict?: boolean;
    strictNullChecks?: boolean;
    stripInternal?: boolean;
    suppressExcessPropertyErrors?: boolean;
    suppressImplicitAnyIndexErrors?: boolean;
    suppressOutputPathCheck?: boolean;
    target?: string;
    traceResolution?: boolean;
    types?: string[];
    typeRoots?: string[];
    typesSearchPaths?: string[];
    version?: boolean;
    watch?: boolean;
}

/**
 * This is the JSON.parse result of a tsconfig.json
 */
interface TypeScriptProjectRawSpecification {
    compilerOptions?: CompilerOptions;
    exclude?: string[];                                 // optional: An array of 'glob' patterns to specify directories / files to exclude
    include?: string[];                                 // optional: An array of 'glob' patterns to specify directories / files to include
    files?: string[];                                   // optional: paths to files
    formatCodeOptions?: formatting.FormatCodeOptions;   // optional: formatting options
    compileOnSave?: boolean;                            // optional: compile on save. Ignored to build tools. Used by IDEs
    buildOnSave?: boolean;
}

//////////////////////////////////////////////////////////////////////

export var errors = {
    GET_PROJECT_INVALID_PATH: 'The path used to query for tsconfig.json does not exist',
    GET_PROJECT_NO_PROJECT_FOUND: 'No Project Found',
    GET_PROJECT_FAILED_TO_OPEN_PROJECT_FILE: 'Failed to fs.readFileSync the project file',
    GET_PROJECT_PROJECT_FILE_INVALID_OPTIONS: 'Project file contains invalid options',

    CREATE_FOLDER_MUST_EXIST: 'The folder must exist on disk in order to create a tsconfig.json',
    CREATE_PROJECT_ALREADY_EXISTS: 'tsconfig.json file already exists',
};
export interface ProjectFileErrorDetails {
    projectFilePath: string;
    error: types.CodeError;
}

import path = require('path');
import os = require('os');
import formatting = require('./formatCodeOptions');

const projectFileName = 'tsconfig.json';
/**
 * This is what we use when the user doesn't specify a files / include
 */
const invisibleFilesInclude = ["./**/*.ts", "./**/*.tsx"];
const invisibleFilesIncludeWithJS = ["./**/*.ts", "./**/*.tsx", "./**/*.js"];

/**
 * What we use to
 * - create a new tsconfig on disk
 * - create an in memory project
 * - default values for a tsconfig file read from disk. Therefore it must match ts defaults
 */
const defaultCompilerOptions: ts.CompilerOptions = {
    target: ts.ScriptTarget.ES5,
    module: ts.ModuleKind.CommonJS,
    moduleResolution: ts.ModuleResolutionKind.NodeJs,
    jsx: ts.JsxEmit.None,
    experimentalDecorators: false,
    emitDecoratorMetadata: false,
    declaration: false,
    noImplicitAny: false,
    suppressImplicitAnyIndexErrors: false,
    strictNullChecks: false,
};

/**
 * If you want to create a project on the fly
 */
export function getDefaultInMemoryProject(srcFile: string): TypeScriptConfigFileDetails {
    var dir = path.dirname(srcFile);
    const allowJs = isJs(srcFile);

    var files = [srcFile];
    var typings = getDefinitionsForNodeModules(dir, files);
    files = increaseCompilationContext(files, allowJs);
    files = uniq(files.map(fsu.consistentPath));

    let project: TsconfigJsonParsed = {
        compilerOptions: extend(defaultCompilerOptions, {
            allowJs,
            lib: [
                'dom',
                'es2017'
            ]
        }),
        files,
        typings: typings.ours.concat(typings.implicit),
        formatCodeOptions: formatting.defaultFormatCodeOptions(),
        compileOnSave: true,
        buildOnSave: false,
    };

    return {
        projectFileDirectory: dir,
        projectFilePath: srcFile,
        project: project,
        inMemory: true
    };
}

/** Given an src (source file or directory) goes up the directory tree to find the project specifications.
 * Use this to bootstrap the UI for what project the user might want to work on.
 * Note: Definition files (.d.ts) are considered thier own project
 */
type GetProjectSyncResponse = { error?: types.CodeError, result?: TypeScriptConfigFileDetails };
export function getProjectSync(pathOrSrcFile: string): GetProjectSyncResponse {

    if (!fsu.existsSync(pathOrSrcFile)) {
        return {
            error: makeBlandError(pathOrSrcFile, errors.GET_PROJECT_INVALID_PATH, 'tsconfig')
        }
    }

    // Get the path directory
    var dir = fs.lstatSync(pathOrSrcFile).isDirectory() ? pathOrSrcFile : path.dirname(pathOrSrcFile);

    // Keep going up till we find the project file
    var projectFile = '';
    try {
        projectFile = fsu.travelUpTheDirectoryTreeTillYouFind(dir, projectFileName);
    }
    catch (e) {
        let err: Error = e;
        if (err.message == "not found") {
            let bland = makeBlandError(fsu.consistentPath(pathOrSrcFile), errors.GET_PROJECT_NO_PROJECT_FOUND, 'tsconfig');
            return {
                error: bland
            };
        }
    }
    projectFile = path.normalize(projectFile);
    var projectFileDirectory = path.dirname(projectFile);
    let projectFilePath = fsu.consistentPath(projectFile);

    // We now have a valid projectFile. Parse it:
    var projectSpec: TypeScriptProjectRawSpecification;
    try {
        var projectFileTextContent = fmc.getOrCreateOpenFile(projectFile).getContents();
    } catch (ex) {
        return {
            error: makeBlandError(pathOrSrcFile, errors.GET_PROJECT_FAILED_TO_OPEN_PROJECT_FILE, 'tsconfig')
        }
    }
    let res = json.parse(projectFileTextContent);
    if (res.data) {
        projectSpec = res.data;
    }
    else {
        let bland = json.parseErrorToCodeError(projectFilePath, res.error, 'tsconfig');
        return { error: bland };
    }

    // Setup default project options
    if (!projectSpec.compilerOptions) projectSpec.compilerOptions = {};

    // Additional global level validations
    if (projectSpec.files && projectSpec.exclude) {
        let bland = makeBlandError(projectFilePath, 'You cannot use both "files" and "exclude" in tsconfig.json', 'tsconfig');
        return { error: bland };
    }
    if (projectSpec.compilerOptions.allowJs && !projectSpec.compilerOptions.outDir) {
        let bland = makeBlandError(projectFilePath, 'You must use an `outDir` if you are using `allowJs` in tsconfig.json', 'tsconfig');
        return { error: bland };
    }
    if (projectSpec.compilerOptions.allowJs && projectSpec.compilerOptions.allowNonTsExtensions) {
        // Bad because otherwise all `package.json`s in the `files` start to give *JavaScript parsing* errors.
        let bland = makeBlandError(projectFilePath, 'If you are using `allowJs` you should not specify `allowNonTsExtensions` in tsconfig.json', 'tsconfig');
        return { error: bland };
    }

    /**
     * Always add `outDir`(if any) to exclude
     */
    if (projectSpec.compilerOptions.outDir) {
        projectSpec.exclude = (projectSpec.exclude || []).concat(projectSpec.compilerOptions.outDir);
    }

    /**
     * Finally expand whatever needs expanding
     * See : https://github.com/TypeStrong/tsconfig/issues/19
     */
    try {
        const tsResult = ts.parseJsonConfigFileContent(projectSpec, ts.sys, path.dirname(projectFile), null, projectFile);
        // console.log(tsResult); // DEBUG
        projectSpec.files = tsResult.fileNames || [];
    }
    catch (ex) {
        return {
            error: makeBlandError(projectFilePath, ex.message, 'tsconfig')
        }
    }

    var pkg: PackageJsonParsed = null;
    try {
        const packageJSONPath = fsu.travelUpTheDirectoryTreeTillYouFind(projectFileDirectory, 'package.json');
        if (packageJSONPath) {
            const parsedPackage = JSON.parse(fmc.getOrCreateOpenFile(packageJSONPath).getContents());
            pkg = {
                main: parsedPackage.main,
                name: parsedPackage.name,
                directory: path.dirname(packageJSONPath),
                definition: parsedPackage.typescript && parsedPackage.typescript.definition
            };
        }
    }
    catch (ex) {
        // console.error('no package.json found', projectFileDirectory, ex.message);
    }

    var project: TsconfigJsonParsed = {
        compilerOptions: {},
        files: projectSpec.files.map(x => path.resolve(projectFileDirectory, x)),
        formatCodeOptions: formatting.makeFormatCodeOptions(projectSpec.formatCodeOptions),
        compileOnSave: projectSpec.compileOnSave == undefined ? true : projectSpec.compileOnSave,
        package: pkg,
        typings: [],
        buildOnSave: !!projectSpec.buildOnSave,
    };

    // Validate the raw compiler options before converting them to TS compiler options
    var validationResult = validate(projectSpec.compilerOptions);
    if (validationResult.errorMessage) {
        return {
            error: makeBlandError(projectFilePath, validationResult.errorMessage, 'tsconfig')
        };
    }

    // Convert the raw options to TS options
    project.compilerOptions = rawToTsCompilerOptions(projectSpec.compilerOptions, projectFileDirectory);

    // Expand files to include references
    project.files = increaseCompilationContext(project.files, !!project.compilerOptions.allowJs);

    // Expand files to include node_modules / package.json / typescript.definition
    var typings = getDefinitionsForNodeModules(dir, project.files);
    project.files = project.files.concat(typings.implicit);
    project.typings = typings.ours.concat(typings.implicit);
    project.files = project.files.concat(typings.packagejson);

    // Normalize to "/" for all files
    // And take the uniq values
    project.files = uniq(project.files.map(fsu.consistentPath));
    projectFileDirectory = fsu.consistentPath(projectFileDirectory);

    return {
        result: {
            projectFileDirectory: projectFileDirectory,
            projectFilePath: projectFileDirectory + '/' + projectFileName,
            project: project,
            inMemory: false
        }
    };
}

/** Creates a project by source file location. Defaults are assumed unless overriden by the optional spec. */
export function createProjectRootSync(
    srcFolder: string,
    defaultOptions: ts.CompilerOptions = extend(defaultCompilerOptions, {
        jsx: ts.JsxEmit.React,
        declaration: true,
        experimentalDecorators: true,
        emitDecoratorMetadata: true,
        outDir: 'lib',
        lib: [
            'dom',
            'es2017',
        ],
    }),
    overWrite = true) {
    if (!fs.existsSync(srcFolder)) {
        throw new Error(errors.CREATE_FOLDER_MUST_EXIST);
    }

    var projectFilePath = path.normalize(srcFolder + '/' + projectFileName);

    if (!overWrite && fs.existsSync(projectFilePath))
        throw new Error(errors.CREATE_PROJECT_ALREADY_EXISTS);

    // We need to write the raw spec
    var projectSpec: TypeScriptProjectRawSpecification = {};
    projectSpec.compilerOptions = tsToRawCompilerOptions(defaultOptions);
    projectSpec.compileOnSave = true;
    projectSpec.exclude = ["node_modules"];
    projectSpec.include = ["src"];

    fs.writeFileSync(projectFilePath, json.stringify(projectSpec, os.EOL));
    return getProjectSync(srcFolder);
}

//////////////////////////////////////////////////////////////////////

/**
 * ENUM to String and String to ENUM
 */
const typescriptEnumMap = {
    target: {
        'es3': ts.ScriptTarget.ES3,
        'es5': ts.ScriptTarget.ES5,
        'es6': ts.ScriptTarget.ES2015,
        'es2015': ts.ScriptTarget.ES2015,
        'es2016': ts.ScriptTarget.ES2016,
        'es2017': ts.ScriptTarget.ES2017,
        'esnext': ts.ScriptTarget.ESNext,
        'next': ts.ScriptTarget.ESNext,
        'latest': ts.ScriptTarget.Latest
    },
    module: {
        'none': ts.ModuleKind.None,
        'commonjs': ts.ModuleKind.CommonJS,
        'amd': ts.ModuleKind.AMD,
        'umd': ts.ModuleKind.UMD,
        'system': ts.ModuleKind.System,
        'es6': ts.ModuleKind.ES2015,
        'es2015': ts.ModuleKind.ES2015,
    },
    moduleResolution: {
        'node': ts.ModuleResolutionKind.NodeJs,
        'classic': ts.ModuleResolutionKind.Classic
    },
    jsx: {
        'none': ts.JsxEmit.None,
        'preserve': ts.JsxEmit.Preserve,
        'react': ts.JsxEmit.React,
        'react-native': ts.JsxEmit.ReactNative,
    },
    newLine: {
        'CRLF': ts.NewLineKind.CarriageReturnLineFeed,
        'LF': ts.NewLineKind.LineFeed
    }
};

/**
 * These are options that are relative paths to tsconfig.json
 * Note: There is also `rootDirs` that is handled manually
 */
const pathResolveTheseOptions = [
    'out',
    'outFile',
    'outDir',
    'rootDir',
    'baseUrl',
];

//////////////////////////////////////////////////////////////////////

/**
 * Raw To Compiler
 */
function rawToTsCompilerOptions(jsonOptions: CompilerOptions, projectDir: string): ts.CompilerOptions {
    const compilerOptions = extend(defaultCompilerOptions);

    /** Parse the enums */
    for (var key in jsonOptions) {
        if (typescriptEnumMap[key]) {
            let name = jsonOptions[key];
            let map = typescriptEnumMap[key];
            compilerOptions[key] = map[name.toLowerCase()] || map[name.toUpperCase()];
        }
        else {
            compilerOptions[key] = jsonOptions[key];
        }
    }

    /**
     * Parse all paths to not be relative
     */
    pathResolveTheseOptions.forEach(option => {
        if (compilerOptions[option] !== undefined) {
            compilerOptions[option] = fsu.resolve(projectDir, compilerOptions[option] as string);
        }
    });

    /**
     * Support `rootDirs`
     * https://github.com/Microsoft/TypeScript-Handbook/blob/release-2.0/pages/Module%20Resolution.md#virtual-directories-with-rootdirs
     */
    if (compilerOptions.rootDirs !== undefined && Array.isArray(compilerOptions.rootDirs)) {
        compilerOptions.rootDirs = compilerOptions.rootDirs.map(rd => {
            return fsu.resolve(projectDir, rd as string);
        });
    }

    /**
     * Till `out` is removed. Support it by just copying it to `outFile`
     */
    if (compilerOptions.out !== undefined) {
        compilerOptions.outFile = path.resolve(projectDir, compilerOptions.out);
    }

    /**
     * The default for moduleResolution as implemented by the compiler
     */
    if (!jsonOptions.moduleResolution && compilerOptions.module !== ts.ModuleKind.CommonJS) {
        compilerOptions.moduleResolution = ts.ModuleResolutionKind.Classic;
    }

    return compilerOptions;
}

/**
 * Compiler to Raw
 */
function tsToRawCompilerOptions(compilerOptions: ts.CompilerOptions): CompilerOptions {
    const jsonOptions = extend({}, compilerOptions) as (ts.CompilerOptions & CompilerOptions);

    /**
     * Convert enums to raw
     */
    Object.keys(compilerOptions).forEach((key) => {
        if (typescriptEnumMap[key] !== undefined && compilerOptions[key] !== undefined) {
            const value = compilerOptions[key] as string;
            const rawToTsMapForKey = typescriptEnumMap[key];
            const reverseMap = reverseKeysAndValues(rawToTsMapForKey);
            jsonOptions[key] = reverseMap[value];
        }
    });

    return jsonOptions;
}