/**
 * parse-prd.js
 * Direct function implementation for parsing PRD documents
 */

import path from 'path';
import fs from 'fs';
import { parsePRD } from '../../../../scripts/modules/task-manager.js';
import {
	enableSilentMode,
	disableSilentMode
} from '../../../../scripts/modules/utils.js';
import { createLogWrapper } from '../../tools/utils.js';

/**
 * Direct function wrapper for parsing PRD documents and generating tasks.
 *
 * @param {Object} args - Command arguments containing projectRoot, input, output, numTasks options.
 * @param {Object} log - Logger object.
 * @param {Object} context - Context object containing session data.
 * @returns {Promise<Object>} - Result object with success status and data/error information.
 */
export async function parsePRDDirect(args, log, context = {}) {
	const { session } = context; // Only extract session

	try {
		log.info(`Parsing PRD document with args: ${JSON.stringify(args)}`);

		// Validate required parameters
		if (!args.projectRoot) {
			const errorMessage = 'Project root is required for parsePRDDirect';
			log.error(errorMessage);
			return {
				success: false,
				error: { code: 'MISSING_PROJECT_ROOT', message: errorMessage },
				fromCache: false
			};
		}
		if (!args.input) {
			const errorMessage = 'Input file path is required for parsePRDDirect';
			log.error(errorMessage);
			return {
				success: false,
				error: { code: 'MISSING_INPUT_PATH', message: errorMessage },
				fromCache: false
			};
		}
		if (!args.output) {
			const errorMessage = 'Output file path is required for parsePRDDirect';
			log.error(errorMessage);
			return {
				success: false,
				error: { code: 'MISSING_OUTPUT_PATH', message: errorMessage },
				fromCache: false
			};
		}

		// Resolve input path (expecting absolute path or path relative to project root)
		const projectRoot = args.projectRoot;
		const inputPath = path.isAbsolute(args.input)
			? args.input
			: path.resolve(projectRoot, args.input);

		// Verify input file exists
		if (!fs.existsSync(inputPath)) {
			const errorMessage = `Input file not found: ${inputPath}`;
			log.error(errorMessage);
			return {
				success: false,
				error: {
					code: 'INPUT_FILE_NOT_FOUND',
					message: errorMessage,
					details: `Checked path: ${inputPath}\nProject root: ${projectRoot}\nInput argument: ${args.input}`
				},
				fromCache: false
			};
		}

		// Resolve output path (expecting absolute path or path relative to project root)
		const outputPath = path.isAbsolute(args.output)
			? args.output
			: path.resolve(projectRoot, args.output);

		// Ensure output directory exists
		const outputDir = path.dirname(outputPath);
		if (!fs.existsSync(outputDir)) {
			log.info(`Creating output directory: ${outputDir}`);
			fs.mkdirSync(outputDir, { recursive: true });
		}

		// Parse number of tasks - handle both string and number values
		let numTasks = 10; // Default
		if (args.numTasks) {
			numTasks =
				typeof args.numTasks === 'string'
					? parseInt(args.numTasks, 10)
					: args.numTasks;
			if (isNaN(numTasks)) {
				numTasks = 10; // Fallback to default if parsing fails
				log.warn(`Invalid numTasks value: ${args.numTasks}. Using default: 10`);
			}
		}

		// Extract the append flag from args
		const append = Boolean(args.append) === true;

		// Log key parameters including append flag
		log.info(
			`Preparing to parse PRD from ${inputPath} and output to ${outputPath} with ${numTasks} tasks, append mode: ${append}`
		);

		// --- Logger Wrapper ---
		const mcpLog = createLogWrapper(log);

		// Prepare options for the core function
		const options = {
			mcpLog,
			session
		};

		// Enable silent mode to prevent console logs from interfering with JSON response
		enableSilentMode();
		try {
			// Make sure the output directory exists
			const outputDir = path.dirname(outputPath);
			if (!fs.existsSync(outputDir)) {
				log.info(`Creating output directory: ${outputDir}`);
				fs.mkdirSync(outputDir, { recursive: true });
			}

			// Execute core parsePRD function with AI client
			const tasksDataResult = await parsePRD(
				inputPath,
				outputPath,
				numTasks,
				{
					mcpLog: logWrapper,
					session,
					append
				},
				aiClient,
				modelConfig
			);

			// Since parsePRD doesn't return a value but writes to a file, we'll read the result
			// to return it to the caller
			if (fs.existsSync(outputPath)) {
				const tasksData = JSON.parse(fs.readFileSync(outputPath, 'utf8'));
				const actionVerb = append ? 'appended' : 'generated';
				const message = `Successfully ${actionVerb} ${tasksData.tasks?.length || 0} tasks from PRD`;

				if (!tasksDataResult || !tasksDataResult.tasks || !tasksData) {
					throw new Error(
						'Core parsePRD function did not return valid task data.'
					);
				}

				log.info(message);

				return {
					success: true,
					data: {
						message,
						taskCount: tasksDataResult.tasks?.length || 0,
						outputPath,
						appended: append
					},
					fromCache: false // This operation always modifies state and should never be cached
				};
			} else {
				const errorMessage = `Tasks file was not created at ${outputPath}`;
				log.error(errorMessage);
				return {
					success: false,
					error: { code: 'OUTPUT_FILE_NOT_CREATED', message: errorMessage },
					fromCache: false
				};
			}
		} finally {
			// Always restore normal logging
			disableSilentMode();
		}
	} catch (error) {
		// Make sure to restore normal logging even if there's an error
		disableSilentMode();

		log.error(`Error parsing PRD: ${error.message}`);
		return {
			success: false,
			error: {
				code: error.code || 'PARSE_PRD_ERROR', // Use error code if available
				message: error.message || 'Unknown error parsing PRD'
			},
			fromCache: false
		};
	}
}