/*---------------------------------------------------------
 * Copyright (C) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License. See LICENSE in the project root for license information.
 *--------------------------------------------------------*/

'use strict';

import vscode = require('vscode');
import { CancellationToken, CodeLens, Command, TextDocument } from 'vscode';
import { GoBaseCodeLensProvider } from './goBaseCodelens';
import { GoDocumentSymbolProvider } from './goOutline';
import { getBenchmarkFunctions, getTestFunctions } from './testUtils';
import { getCurrentGoPath, getGoConfig } from './util';

export class GoRunTestCodeLensProvider extends GoBaseCodeLensProvider {
	private readonly benchmarkRegex = /^Benchmark.+/;
	private readonly debugConfig: any = {
		name: 'Launch',
		type: 'go',
		request: 'launch',
		mode: 'test',
		env: {
			GOPATH: getCurrentGoPath() // Passing current GOPATH to Delve as it runs in another process
		}
	};

	public provideCodeLenses(document: TextDocument, token: CancellationToken): CodeLens[] | Thenable<CodeLens[]> {
		if (!this.enabled) {
			return [];
		}
		const config = getGoConfig(document.uri);
		const codeLensConfig = config.get<{ [key: string]: any }>('enableCodeLens');
		const codelensEnabled = codeLensConfig ? codeLensConfig['runtest'] : false;
		if (!codelensEnabled || !document.fileName.endsWith('_test.go')) {
			return [];
		}

		return Promise.all([
			this.getCodeLensForPackage(document, token),
			this.getCodeLensForFunctions(config, document, token)
		]).then(([pkg, fns]) => {
			let res: any[] = [];
			if (pkg && Array.isArray(pkg)) {
				res = res.concat(pkg);
			}
			if (fns && Array.isArray(fns)) {
				res = res.concat(fns);
			}
			return res;
		});
	}

	private async getCodeLensForPackage(document: TextDocument, token: CancellationToken): Promise<CodeLens[]> {
		const documentSymbolProvider = new GoDocumentSymbolProvider();
		const symbols = await documentSymbolProvider.provideDocumentSymbols(document, token);
		const pkg = symbols[0];
		if (!pkg) {
			return [];
		}
		const range = pkg.range;
		const packageCodeLens = [
			new CodeLens(range, {
				title: 'run package tests',
				command: 'go.test.package'
			}),
			new CodeLens(range, {
				title: 'run file tests',
				command: 'go.test.file'
			})
		];
		if (
			symbols[0].children.some(
				(sym) => sym.kind === vscode.SymbolKind.Function && this.benchmarkRegex.test(sym.name)
			)
		) {
			packageCodeLens.push(
				new CodeLens(range, {
					title: 'run package benchmarks',
					command: 'go.benchmark.package'
				}),
				new CodeLens(range, {
					title: 'run file benchmarks',
					command: 'go.benchmark.file'
				})
			);
		}
		return packageCodeLens;
	}

	private async getCodeLensForFunctions(
		vsConfig: vscode.WorkspaceConfiguration,
		document: TextDocument,
		token: CancellationToken
	): Promise<CodeLens[]> {
		const codelens: CodeLens[] = [];

		const testPromise = getTestFunctions(document, token).then((testFunctions) => {
			testFunctions.forEach((func) => {
				const runTestCmd: Command = {
					title: 'run test',
					command: 'go.test.cursor',
					arguments: [{ functionName: func.name }]
				};

				codelens.push(new CodeLens(func.range, runTestCmd));

				const debugTestCmd: Command = {
					title: 'debug test',
					command: 'go.debug.cursor',
					arguments: [{ functionName: func.name }]
				};

				codelens.push(new CodeLens(func.range, debugTestCmd));
			});
		});

		const benchmarkPromise = getBenchmarkFunctions(document, token).then((benchmarkFunctions) => {
			benchmarkFunctions.forEach((func) => {
				const runBenchmarkCmd: Command = {
					title: 'run benchmark',
					command: 'go.benchmark.cursor',
					arguments: [{ functionName: func.name }]
				};

				codelens.push(new CodeLens(func.range, runBenchmarkCmd));

				const debugTestCmd: Command = {
					title: 'debug benchmark',
					command: 'go.debug.cursor',
					arguments: [{ functionName: func.name }]
				};

				codelens.push(new CodeLens(func.range, debugTestCmd));
			});
		});

		await Promise.all([testPromise, benchmarkPromise]);
		return codelens;
	}
}