import * as fs from "node:fs";
import * as nodePath from "node:path";

import type { ExtensionAPI, ToolCallEvent } from "@earendil-works/pi-coding-agent";
import { PI_MUTATING_FILE_TOOLS } from "./guard-rules";

export class EventAdapter {
	/**
	 * Checks if the tool event is a mutating file operation (write, edit, etc).
	 */
	static isMutatingFileTool(event: ToolCallEvent<any, any>): boolean {
		return PI_MUTATING_FILE_TOOLS.includes(event.toolName);
	}

	/**
	 * Extracts the target path from a tool input, resolving against the current working directory.
	 */
	static extractPathFromToolInput(event: ToolCallEvent<any, any>, cwd: string): string | null {
		const input = event.input;
		if (!input) return null;

		const pathRaw = input.path || input.file || input.filePath;
		if (typeof pathRaw === "string") {
			return pathRaw; // Usually Pi passes absolute paths anyway or paths relative to root
		}

		return null;
	}

	/**
	 * Safely formats a block reason string to ensure UI readiness.
	 */
	static formatBlockReason(prefix: string, details: string): string {
		return `${prefix}: ${details}`;
	}
	/**
	 * Returns true if the given directory is a beads project (has a .beads directory).
	 */
	static isBeadsProject(cwd: string): boolean {
		return fs.existsSync(nodePath.join(cwd, ".beads"));
	}

	/**
	 * Parses the summary line from `bd list` output.
	 * Returns { open, inProgress } or null if the line is absent.
	 */
	static parseBdCounts(output: string): { open: number; inProgress: number } | null {
		const m = output.match(/Total:\s*\d+\s+issues?\s*\((\d+)\s+open,\s*(\d+)\s+in progress\)/);
		if (!m) return null;
		return { open: parseInt(m[1], 10), inProgress: parseInt(m[2], 10) };
	}
}