// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT License.

'use strict';

import { EOL } from 'os';

import * as vscode from 'vscode';

import { RestTextConverter } from '../common/markdown/restTextConverter';

import { JediFactory } from '../languageServices/jediProxyFactory';

import * as proxy from './jediProxy';

export class LanguageItemInfo {

constructor(

public tooltip: vscode.MarkdownString,

public detail: string,

public signature: vscode.MarkdownString) { }

}

export interface IItemInfoSource {

getItemInfoFromText(documentUri: vscode.Uri, fileName: string,

range: vscode.Range, sourceText: string,

token: vscode.CancellationToken): Promise<LanguageItemInfo[] | undefined>;

getItemInfoFromDocument(document: vscode.TextDocument, position: vscode.Position,

token: vscode.CancellationToken): Promise<LanguageItemInfo[] | undefined>;

}

export class ItemInfoSource implements IItemInfoSource {

private textConverter = new RestTextConverter();

constructor(private jediFactory: JediFactory) { }

public async getItemInfoFromText(documentUri: vscode.Uri, fileName: string, range: vscode.Range, sourceText: string, token: vscode.CancellationToken)

: Promise<LanguageItemInfo[] | undefined> {

const result = await this.getHoverResultFromTextRange(documentUri, fileName, range, sourceText, token);

if (!result || !result.items.length) {

return;

}

return this.getItemInfoFromHoverResult(result, '');

}

public async getItemInfoFromDocument(document: vscode.TextDocument, position: vscode.Position, token: vscode.CancellationToken)

: Promise<LanguageItemInfo[] | undefined> {

const range = document.getWordRangeAtPosition(position);

if (!range || range.isEmpty) {

return;

}

const result = await this.getHoverResultFromDocument(document, position, token);

if (!result || !result.items.length) {

return;

}

const word = document.getText(range);

return this.getItemInfoFromHoverResult(result, word);

}

private async getHoverResultFromDocument(document: vscode.TextDocument, position: vscode.Position, token: vscode.CancellationToken)

: Promise<proxy.IHoverResult | undefined> {

if (position.character <= 0 || document.lineAt(position.line).text.match(/^\s*\/\//)) {

return;

}

const range = document.getWordRangeAtPosition(position);

if (!range || range.isEmpty) {

return;

}

return this.getHoverResultFromDocumentRange(document, range, token);

}

private async getHoverResultFromDocumentRange(document: vscode.TextDocument, range: vscode.Range, token: vscode.CancellationToken)

: Promise<proxy.IHoverResult | undefined> {

const cmd: proxy.ICommand = {

command: proxy.CommandType.Hover,

fileName: document.fileName,

columnIndex: range.end.character,

lineIndex: range.end.line

};

if (document.isDirty) {

cmd.source = document.getText();

}

return this.jediFactory.getJediProxyHandler<proxy.IHoverResult>(document.uri).sendCommand(cmd, token);

}

private async getHoverResultFromTextRange(documentUri: vscode.Uri, fileName: string, range: vscode.Range, sourceText: string, token: vscode.CancellationToken)

: Promise<proxy.IHoverResult | undefined> {

const cmd: proxy.ICommand = {

command: proxy.CommandType.Hover,

fileName: fileName,

columnIndex: range.end.character,

lineIndex: range.end.line,

source: sourceText

};

return this.jediFactory.getJediProxyHandler<proxy.IHoverResult>(documentUri).sendCommand(cmd, token);

}

private getItemInfoFromHoverResult(data: proxy.IHoverResult, currentWord: string): LanguageItemInfo[] {

const infos: LanguageItemInfo[] = [];

data.items.forEach(item => {

const signature = this.getSignature(item, currentWord);

let tooltip = new vscode.MarkdownString();

if (item.docstring) {

let lines = item.docstring.split(/\r?\n/);

// If the docstring starts with the signature, then remove those lines from the docstring.

if (lines.length > 0 && item.signature.indexOf(lines[0]) === 0) {

lines.shift();

const endIndex = lines.findIndex(line => item.signature.endsWith(line));

if (endIndex >= 0) {

lines = lines.filter((_line, index) => index > endIndex);

}

}

if (lines.length > 0 && currentWord.length > 0 && item.signature.startsWith(currentWord) && lines[0].startsWith(currentWord) && lines[0].endsWith(')')) {

lines.shift();

}

if (signature.length > 0) {

tooltip = tooltip.appendMarkdown(['```python', signature, '```', ''].join(EOL));

}

const description = this.textConverter.toMarkdown(lines.join(EOL));

tooltip = tooltip.appendMarkdown(description);

infos.push(new LanguageItemInfo(tooltip, item.description, new vscode.MarkdownString(signature)));

return;

}

if (item.description) {

if (signature.length > 0) {

tooltip.appendMarkdown(['```python', signature, '```', ''].join(EOL));

}

const description = this.textConverter.toMarkdown(item.description);

tooltip.appendMarkdown(description);

infos.push(new LanguageItemInfo(tooltip, item.description, new vscode.MarkdownString(signature)));

return;

}

if (item.text) { // Most probably variable type

const code = currentWord && currentWord.length > 0

? `${currentWord}: ${item.text}`

: item.text;

tooltip.appendMarkdown(['```python', code, '```', ''].join(EOL));

infos.push(new LanguageItemInfo(tooltip, '', new vscode.MarkdownString()));

}

});

return infos;

}

private getSignature(item: proxy.IHoverItem, currentWord: string): string {

let { signature } = item;

switch (item.kind) {

case vscode.SymbolKind.Constructor:

case vscode.SymbolKind.Function:

case vscode.SymbolKind.Method: {

signature = `def ${signature}`;

break;

}

case vscode.SymbolKind.Class: {

signature = `class ${signature}`;

break;

}

case vscode.SymbolKind.Module: {

if (signature.length > 0) {

signature = `module ${signature}`;

}

break;

}

default: {

signature = typeof item.text === 'string' && item.text.length > 0 ? item.text : currentWord;

}

}

return signature;

}

}