// Original script was GPT4 but it has been deeply Ship of Theseused. 

import * as vscode from "vscode";
import axios from "axios";

let VSConfig: vscode.WorkspaceConfiguration;
let apiEndpoint: string;
let apiAuthentication: string;
let apiModel: string;
let apiMessageHeader: string;
let apiTemperature: number;
let numPredict: number;
let promptWindowSize: number;
let completionKeys: string;
let responsePreview: boolean | undefined;
let responsePreviewMaxTokens: number;
let responsePreviewDelay: number;
let continueInline: boolean | undefined;
let keepAlive: number | undefined;
let topP: number | undefined;


function updateVSConfig() {
	VSConfig = vscode.workspace.getConfiguration("fabelous-autocoder");
	apiEndpoint = VSConfig.get("endpoint") || "http://localhost:11434/api/generate";
	apiAuthentication = VSConfig.get("authentication") || "";
	apiModel = VSConfig.get("model") || "openhermes2.5-mistral:7b-q4_K_M"; // The model I tested with
	apiMessageHeader = VSConfig.get("message header") || "";
	numPredict = VSConfig.get("max tokens predicted") || 1000;
	promptWindowSize = VSConfig.get("prompt window size") || 2000;
	completionKeys = VSConfig.get("completion keys") || " ";
	responsePreview = VSConfig.get("response preview");
	responsePreviewMaxTokens = VSConfig.get("preview max tokens") || 50;
	responsePreviewDelay = VSConfig.get("preview delay") || 0; // Must be || 0 instead of || [default] because of truthy
	continueInline = VSConfig.get("continue inline");
	apiTemperature = VSConfig.get("temperature") || 0.7;
	keepAlive = VSConfig.get("keep alive") || 30;
	topP = VSConfig.get("top p") || 1;
}

updateVSConfig();
// No need for restart for any of these settings
vscode.workspace.onDidChangeConfiguration(updateVSConfig);
// Give model additional information
function messageHeaderSub(document: vscode.TextDocument) {
	const sub = apiMessageHeader
		.replace("{LANG}", document.languageId)
		.replace("{FILE_NAME}", document.fileName)
		.replace("{PROJECT_NAME}", vscode.workspace.name || "Untitled");
	return sub;
}
// internal function for autocomplete, not directly exposed
async function autocompleteCommand(textEditor: vscode.TextEditor, cancellationToken?: vscode.CancellationToken) {
    const document = textEditor.document;
    const position = textEditor.selection.active;

    // Get the current prompt
    let prompt = document.getText(new vscode.Range(document.lineAt(0).range.start, position));
    prompt = prompt.substring(Math.max(0, prompt.length - promptWindowSize), prompt.length);

    // Replace {Prompt} with the extracted text from the document
    const sub = messageHeaderSub(document).replace("{Prompt}", prompt);

    // Show a progress message
    vscode.window.withProgress(
        {
            location: vscode.ProgressLocation.Notification,
            title: "Ollama Autocoder",
            cancellable: true,
        },
        async (progress, progressCancellationToken) => {
            try {
                progress.report({ message: "Starting model..." });

                let axiosCancelPost: () => void;
                const axiosCancelToken = new axios.CancelToken((c) => {
                    const cancelPost = function () {
                        c("Autocompletion request terminated by user cancel");
                    };

                    axiosCancelPost = cancelPost;
                    if (cancellationToken) cancellationToken.onCancellationRequested(cancelPost);
                    progressCancellationToken.onCancellationRequested(cancelPost);
                    vscode.workspace.onDidCloseTextDocument(cancelPost);
                });

                // Make a request to the ollama.ai REST API
                const response = await axios.post(apiEndpoint, {
                    model: apiModel, // Change this to the model you want to use
                    prompt: sub, // Use the modified sub string with the replaced prompt
                    stream: true,
                    raw: true,
                    options: {
                        num_predict: numPredict,
                        temperature: apiTemperature,
                        stop: ["```"]
                    }
				}, {
					cancelToken: axiosCancelToken,
					responseType: 'stream',
					headers: {
						'Authorization': apiAuthentication
					}
				}
				);
				//tracker
				let currentPosition = position;
				response.data.on('data', async (d: Uint8Array) => {
					progress.report({ message: "Generating..." });
					// Check for user input (cancel)
					if (currentPosition.line != textEditor.selection.end.line || currentPosition.character != textEditor.selection.end.character) {
						axiosCancelPost(); // cancel axios => cancel finished promise => close notification
						return;
					}
					// Get a completion from the response
					const completion: string = JSON.parse(d.toString()).response;
					// lastToken = completion;
					

					if (completion === "") {
						return;
					}
					//complete edit for token
					const edit = new vscode.WorkspaceEdit();
					edit.insert(document.uri, currentPosition, completion);
					await vscode.workspace.applyEdit(edit);
					// Move the cursor to the end of the completion
					const completionLines = completion.split("\n");
					const newPosition = new vscode.Position(
						currentPosition.line + completionLines.length - 1,
						(completionLines.length > 1 ? 0 : currentPosition.character) + completionLines[completionLines.length - 1].length
					);
					const newSelection = new vscode.Selection(
						position,
						newPosition
					);
					currentPosition = newPosition;
					// completion bar
					progress.report({ message: "Generating...", increment: 1 / (numPredict / 100) });
					// move cursor
					textEditor.selection = newSelection;
				});
				// Keep cancel window available
				const finished = new Promise((resolve) => {
					response.data.on('end', () => {
						progress.report({ message: "Fabelous completion finished." });
						resolve(true);
					});
					axiosCancelToken.promise.finally(() => { // prevent notification from freezing on user input cancel
						resolve(false);
					});
				});
				await finished;
			} catch (err: any) {
				// Show an error message
				vscode.window.showErrorMessage(
					"Fabelous Autocoder encountered an error: " + err.message
				);
				console.log(err);
			}
		}
	);
}
// Completion item provider callback for activate
async function provideCompletionItems(document: vscode.TextDocument, position: vscode.Position, cancellationToken: vscode.CancellationToken) {
	// Create a completion item
	const item = new vscode.CompletionItem("Fabelous autocompletion");
	// Set the insert text to a placeholder
	item.insertText = new vscode.SnippetString('${1:}');
	// Wait before initializing Ollama to reduce compute usage
	if (responsePreview) await new Promise(resolve => setTimeout(resolve, responsePreviewDelay * 1000));
	if (cancellationToken.isCancellationRequested) {
		return [ item ];
	}
	// Set the label & inset text to a shortened, non-stream response
	if (responsePreview) {
		let prompt = document.getText(new vscode.Range(document.lineAt(0).range.start, position));
		prompt = prompt.substring(Math.max(0, prompt.length - promptWindowSize), prompt.length);
		const response_preview = await axios.post(apiEndpoint, {
			model: apiModel, // Change this to the model you want to use
			prompt: messageHeaderSub(document) + prompt,
			stream: false,
			raw: true,
			options: {
				num_predict: responsePreviewMaxTokens, // reduced compute max
				temperature: apiTemperature,
				stop: ['\n', '```'],
				...keepAlive && { keep_alive: keepAlive },
				...topP && { top_p: topP },
			}
		}, {
			cancelToken: new axios.CancelToken((c) => {
				const cancelPost = function () {
					c("Autocompletion request terminated by completion cancel");
				};
				cancellationToken.onCancellationRequested(cancelPost);
			})
		});
		if (response_preview.data.response.trim() != "") { // default if empty
			item.label = response_preview.data.response.trimStart(); // tended to add whitespace at the beginning
			item.insertText = response_preview.data.response.trimStart();
		}
	}
	// Set the documentation to a message
	item.documentation = new vscode.MarkdownString('Press `Enter` to get an autocompletion from Ollama');
	// Set the command to trigger the completion
	if (continueInline || !responsePreview) item.command = {
		command: 'fabelous-autocoder.autocomplete',
		title: 'Fabelous Autocomplete',
		arguments: [cancellationToken]
	};
	// Return the completion item
	return [item];
}
// This method is called when extension is activated
function activate(context: vscode.ExtensionContext) {
	// Register a completion provider for JavaScript files
	const completionProvider = vscode.languages.registerCompletionItemProvider("*", {
		provideCompletionItems
	},
		...completionKeys.split("")
	);
	// Register a command for getting a completion from Ollama through command/keybind
	const externalAutocompleteCommand = vscode.commands.registerTextEditorCommand(
		"fabelous-autocoder.autocomplete",
		(textEditor, _, cancellationToken?) => {
			// no cancellation token from here, but there is one from completionProvider
			autocompleteCommand(textEditor, cancellationToken);
		}
	);
	// Add the commands & completion provider to the context
	context.subscriptions.push(completionProvider);
	context.subscriptions.push(externalAutocompleteCommand);
}

// This method is called when extension is deactivated
// eslint-disable-next-line @typescript-eslint/no-empty-function
function deactivate() { }

module.exports = {
	activate,
	deactivate,
};