//const fs = require('fs').promises;
const fs = require('fs');
const path = require('path');
const replace = require('replace-in-file');
const _ = require('lodash');

async function getTemplateFiles(dir) {
	let files = await fs.promises.readdir(dir);
	files = await Promise.all(files.map(async file => {
		const filePath = path.join(dir, file);
		const stats = await fs.promises.stat(filePath);
		if (stats.isDirectory()) return getTemplateFiles(filePath);
		else if (stats.isFile()) return filePath;
	}));

	return files.reduce((all, folderContents) => all.concat(folderContents), []);
}
console.log("Copying backend schema files...");

// Get and Copy all template files from backend source to frontend app folders and format as required
getTemplateFiles('../../backend/src/tmss/tmssapp/schemas').then(async (backEndFiles) => {
	console.log(backEndFiles);
	// Copy backend template json files to public/schemas folder in frontend app
	for (let file of backEndFiles) {
		if (file.indexOf(".json") <= 0) { continue; }
		let folderName = file.substring(file.indexOf("schemas\\") + 8, file.lastIndexOf("\\"));
		let fileName = file.substring(file.lastIndexOf("\\") + 1);
		const data = fs.readFileSync(file, 'utf8')
		//console.log(data)
		if (!fs.existsSync("public/schemas/" + folderName)) {
			fs.mkdirSync("public/schemas/" + folderName, { recursive: true });
		}
		console.log("Writing to file...", "public/schemas/" + folderName + "/" + fileName);
		fs.writeFileSync("public/schemas/" + folderName + "/" + fileName, data);
	}

	// Get all template files from public/schema folder and format as required
	getTemplateFiles('public/schemas').then(async (files) => {
		console.log("Updating schema ref path...");
		console.log(files);
		console.log("Replace the host and port address of template apis to localhost")

		const hostReplaceOptions = {
			//files: 'schemas/scheduling_constraints_template/constraints-1.json',
			files: files,
			from: /http:\/\/127.0.0.1:8000\/api/g,
			to: 'http://localhost:3000',
		};
		console.log(" \\ hostReplaceOptions (127.0.0.1 to localhost)  ")
		try {
			const results = await replace(hostReplaceOptions);
			console.log('Replacement Results:', results)
		}
		catch (error) {
			console.error('Replacement Error occurred:', error);
		}

		console.log(" / hostReplaceOptions ")
		const hostReplaceOptionslofar = {
			//files: 'schemas/scheduling_constraints_template/constraints-1.json',
			files: files,
			from: /https:\/\/tmss.lofar.eu\/api/g,
			to: 'http://localhost:3000',
		};
		console.log(" \\ hostReplaceOptionslofar (tms lofar to localhost)  ")
		try {
			const results = await replace(hostReplaceOptionslofar);
			console.log('hostReplaceOptionslofar Results:', results)
		}
		catch (error) {
			console.error('hostReplaceOptionslofar Error occurred:', error);
		}


		console.log(" /  hostReplaceOptionslofar   ")


		for (const ver of _.range(1, 11)) {
			let verRegx = new RegExp(`/${ver}/#`, 'g');
			let verReplacer = `-${ver}.json#`;
			// Replace db_id with file extension
			const fileReplaceOptions = {
				files: files,
				from: verRegx,
				to: verReplacer
			};

			console.log("\\ fileReplaceOptions   ")
			try {
				const results = await replace(fileReplaceOptions);
				console.log('fileReplaceOptions Results:', results)
			}
			catch (error) {
				console.error('fileReplaceOptions Error occurred:', error);
			}
			console.log("/ fileReplaceOptions   ")

			verRegx = new RegExp(`/${ver}#`, 'g');
			const fileReplaceOptions1 = {
				files: files,
				from: verRegx,
				to: verReplacer
			};


			console.log("\\ fileReplaceOptions1   ")
			try {
				const results = await replace(fileReplaceOptions1);
				console.log('fileReplaceOfileReplaceOptions1ptions Results:', results)
			}
			catch (error) {
				console.error('fileReplaceOptions1 Error occurred:', error);
			}
			
		}
		console.log("Past  Replacer One ")
		/*const fileReplaceOptions2 = {
		  files: files,
		  from: /.json#\/definitions/g,
		  to: '.json#/schema/definitions',
		};
		console.log(await replace(fileReplaceOptions2));*/

		for (let file of files) {
			if (file.indexOf(".json") <= 0) { continue; }
			console.log("In Loop, Looking at " + file);

			let folderName = file.substring(file.indexOf("schemas\\") + 8, file.lastIndexOf("\\"));
			// Replae folder name		
			let folderRef = folderName.replace(/_/g, "");
			let folderRefRegex = new RegExp(folderRef, "g");
			const folderReplaceOptions = {
				files: files,
				from: folderRefRegex,
				to: folderName,
			};

			console.log("\\ folderReplaceOptions   ")
			try {
				const results = await replace(folderReplaceOptions);
				console.log('folderReplaceOptions Results:', results)
			}
			catch (error) {
				console.error('folderReplaceOptions Error occurred:', error);
			}
			console.log("/ folderReplaceOptions   ")

			
		

			console.log("Copy templates to build folder so that it can be referred by the test suites")
			const data = fs.readFileSync(file, 'utf8');
			//console.log(data)
			if (!fs.existsSync("build/schemas/" + folderName)) {
				console.log("Creating folder.... build/schemas/" + folderName);
				fs.mkdirSync("build/schemas/" + folderName, { recursive: true });
			}
			console.log("Copying files from ", file, file.replace("public", "build"));
			fs.writeFileSync(file.replace("public", "build"), data);

			// Update the json files in public/schemas folder to contain only the schema object
			const jsonData = JSON.parse(data);
			if (jsonData["schema"]) {
				console.log("Updating schema file...", file);
				fs.writeFileSync(file, JSON.stringify(jsonData["schema"], null, 4));
			}
		}

		getTemplateFiles("build/schemas/scheduling_unit_observing_strategy_template").then(async (strategyFiles) => {
			let strategies = [];
			let index = 1;
			console.log("Getting observing_strategy_templates");
			for (const file of strategyFiles) {
				console.log("StrategyFiles:" + file);
				const data = fs.readFileSync(file, 'utf8');
				let strategyTemplate = JSON.parse(data);
				strategyTemplate.id = index;
				strategyTemplate.state_value = strategyTemplate.state;
				strategyTemplate.purpose_value = strategyTemplate.purpose;
				index++;
				strategies.push(strategyTemplate);
			}
			console.log("Creating observing_strategy_templates.json ...");
			fs.writeFileSync("src/__mocks__/observing_strategy_templates.json", JSON.stringify({ strategies: strategies }, null, 4));
			console.log("... Created observing_strategy_templates.json");
		});

		console.log("Getting definitions from common_schema_templates....");
		let definitionTemplates = await getTemplateFiles("build/schemas/common_schema_template");
		console.log(definitionTemplates);
		let definitions = {}, definitionFiles = [];
		for (const definitionTemplate of definitionTemplates) {
			const data = fs.readFileSync(definitionTemplate, 'utf8');
			let definitionSchema = JSON.parse(data);
			if (definitionSchema.schema && definitionSchema.schema.definitions) {
				definitions = { ...definitions, ...definitionSchema.schema.definitions };
				definitionFiles.push(definitionTemplate.substring(definitionTemplate.lastIndexOf("\\") + 1));
			}
		}
		console.log("... got definitions");

		getTemplateFiles("build/schemas/task_template").then(async (strategyFiles) => {
			let templates = [];
			let index = 1;
			console.log("Getting task_templates");
			for (const file of strategyFiles) {
				const data = fs.readFileSync(file, 'utf8');
				let taskTemplate = JSON.parse(data);
				taskTemplate.id = index;
				taskTemplate.ref_resolved_schema = { definitions: definitions, properties: taskTemplate.schema["properties"] };
				if (taskTemplate.name.indexOf("observation") >= 0) {
					taskTemplate.type = "http://localhost:3000/api/task_type/observation";
					taskTemplate.type_value = "observation";
				} else if (taskTemplate.name.indexOf("pipeline") >= 0) {
					taskTemplate.type = "http://localhost:3000/api/task_type/pipeline";
					taskTemplate.type_value = "pipeline";
				} else if (taskTemplate.name.indexOf("cleanup") >= 0) {
					taskTemplate.type = "http://localhost:3000/api/task_type/cleanup";
					taskTemplate.type_value = "cleanup";
				} else if (taskTemplate.name.indexOf("ingest") >= 0) {
					taskTemplate.type = "http://localhost:3000/api/task_type/ingest";
					taskTemplate.type_value = "ingest";
				}

				if (taskTemplate?.schema?.properties?.station_configuration) { taskTemplate.schema.properties.station_configuration["$ref"] = "#/definitions/station_configuration"; }
				if (taskTemplate?.schema?.properties?.QA) taskTemplate.schema.properties.QA["$ref"] = "#/definitions/QA";
				if (taskTemplate?.schema?.properties?.duration) taskTemplate.schema.properties.duration["$ref"] = "#/definitions/duration";
				if (taskTemplate?.schema?.properties?.calibrator) taskTemplate.schema.properties.calibrator["$ref"] = "#/definitions/calibrator";
				if (taskTemplate?.schema?.properties?.correlator) taskTemplate.schema.properties.correlator["$ref"] = "#/definitions/correlator"; 
				
				index++;
				templates.push(taskTemplate);
			}
			templates = JSON.stringify(templates);
			templates = templates.replace(/http:\/\/localhost:3000\/schemas\/common_schema_template\//g, "");
			for (const defFile of definitionFiles) {
				const fileRegex = new RegExp(defFile, 'g');
				templates = templates.replace(fileRegex, "");
			}
			console.log("Creating task_templates.json ...");
			fs.writeFileSync("src/__mocks__/task_templates.json", JSON.stringify({ templates: JSON.parse(templates) }, null, 4));
			console.log("... Created task_templates.json");
		});

		getTemplateFiles("build/schemas/scheduling_constraints_template").then(async (strategyFiles) => {
			let index = 0
			const constraintDefinitionKeys = ["distance_on_sky", "elevation", "timedelta", "timestamp", "timewindow", "pointing"];
			for (const file of strategyFiles) {
				const data = fs.readFileSync(file, 'utf8');
				let constraintTemplate = JSON.parse(data);
				constraintTemplate.id = index;
				constraintTemplate.ref_resolved_schema = _.cloneDeep(constraintTemplate.schema);
				for (const defKey of constraintDefinitionKeys) {
					if (definitions[defKey]) {
						constraintTemplate.ref_resolved_schema.definitions[defKey] = definitions[defKey];
					}
				}
				index++;
				constraintTemplate = JSON.stringify(constraintTemplate);
				constraintTemplate = constraintTemplate.replace(/http:\/\/localhost:3000\/schemas\/common_schema_template\//g, "");
				for (const defFile of definitionFiles) {
					const fileRegex = new RegExp(defFile, 'g');
					constraintTemplate = constraintTemplate.replace(fileRegex, "");
				}
				fs.writeFileSync(file, JSON.stringify(JSON.parse(constraintTemplate), null, 4));
				console.log("... added ref_resolved_schema to constraints_template");
			}
		});

	});

});