#!/usr/bin/env node
// gsd-hook-version: 1.30.0
// SHARED CANONICAL FILE - hardlinked into all harness hooks/ directories.
// Harness config dir is auto-detected from __dirname at runtime.
// Do NOT hardcode harness-specific paths here. See HOOKS_ARCHITECTURE.md.
// GSD Workflow Guard - PreToolUse hook
// Detects when Claude attempts file edits outside a GSD workflow context
// (no active /gsd- command or Task subagent) and injects an advisory warning.
//
// This is a SOFT guard - it advises, not blocks. The edit still proceeds.
// The warning nudges the agent to use /gsd-quick or /gsd-fast instead of
// making direct edits that bypass state tracking.
//
// Enable via config: hooks.workflow_guard: true (default: false)
// Only triggers on Write/Edit tool calls to non-.planning/ files.

const fs = require("fs");
const path = require("path");

let input = "";
const stdinTimeout = setTimeout(() => process.exit(0), 3000);
process.stdin.setEncoding("utf8");
process.stdin.on("data", (chunk) => (input += chunk));
process.stdin.on("end", () => {
	clearTimeout(stdinTimeout);
	try {
		const data = JSON.parse(input);
		const toolName = data.tool_name;

		// Only guard Write and Edit tool calls
		if (toolName !== "Write" && toolName !== "Edit") {
			process.exit(0);
		}

		// Check if we're inside a GSD workflow (Task subagent or /gsd- command)
		// Subagents have a session_id that differs from the parent
		// and typically have a description field set by the orchestrator
		if (data.tool_input?.is_subagent || data.session_type === "task") {
			process.exit(0);
		}

		// Check the file being edited
		const filePath = data.tool_input?.file_path || data.tool_input?.path || "";

		// Allow edits to .planning/ files (GSD state management)
		if (filePath.includes(".planning/") || filePath.includes(".planning\\")) {
			process.exit(0);
		}

		// Allow edits to common config/docs files that don't need GSD tracking
		const allowedPatterns = [
			/\.gitignore$/,
			/\.env/,
			/CLAUDE\.md$/,
			/AGENTS\.md$/,
			/GEMINI\.md$/,
			/settings\.json$/,
		];
		if (allowedPatterns.some((p) => p.test(filePath))) {
			process.exit(0);
		}

		// Check if workflow guard is enabled
		const cwd = data.cwd || process.cwd();
		const configPath = path.join(cwd, ".planning", "config.json");
		if (fs.existsSync(configPath)) {
			try {
				const config = JSON.parse(fs.readFileSync(configPath, "utf8"));
				if (!config.hooks?.workflow_guard) {
					process.exit(0); // Guard disabled (default)
				}
			} catch (e) {
				process.exit(0);
			}
		} else {
			process.exit(0); // No GSD project - don't guard
		}

		// If we get here: GSD project, guard enabled, file edit outside .planning/,
		// not in a subagent context. Inject advisory warning.
		const output = {
			hookSpecificOutput: {
				hookEventName: "PreToolUse",
				additionalContext:
					`⚠️ WORKFLOW ADVISORY: You're editing ${path.basename(filePath)} directly without a GSD command. ` +
					"This edit will not be tracked in STATE.md or produce a SUMMARY.md. " +
					"Consider using /gsd-fast for trivial fixes or /gsd-quick for larger changes " +
					"to maintain project state tracking. " +
					"If this is intentional (e.g., user explicitly asked for a direct edit), proceed normally.",
			},
		};

		process.stdout.write(JSON.stringify(output));
	} catch (e) {
		// Silent fail - never block tool execution
		process.exit(0);
	}
});