/**
 * convertir un fichier .org vers des données structurées en json
 * @type {*}
 */
import fs from 'node-fs'
import moment from 'moment'
import * as emoji from 'node-emoji'

/**********************
 * initialize configs
 **********************/

const sourceFileName = 'all_tasks.org'
const sourceFilePath = './sources/' + sourceFileName
const outputAbsolutePath = '~/Nextcloud/ressources/social sorting/output/'
const outputFileNameJson = 'export_' + sourceFileName + '_parsed.json'

let headers = []
let tasksObjectsForJsonExport = []
let headersByKind = {}
let writeJsonAfterParse = false
writeJsonAfterParse = true
moment.locale('FR')

const tada = emoji.get('tada')
const gift = emoji.get('gift')

/**************************************************************
 * fetch the source orgmode file to read its contents
 *************************************************************/

console.log('---------- parse some org file', sourceFilePath)
if (!sourceFilePath) {
	console.error('pas de fichier à ouvrir')
}
fs.stat(sourceFilePath, function (err, stat) {
	if (err === null) {
		console.log(`File ${sourceFilePath} exists`)

	} else if (err.code === 'ENOENT') {
		// file does not exist
		console.error(`le fichier ${sourceFilePath} est introuvable. Impossible d en extraire des infos.`, err)
	} else {
		console.log('Some other error: ', err.code)
	}
})

/**********************
 * search elements
 *********************/
let stateKeywordList = ['SOMEDAY', 'NEXT', 'TODO', 'CANCELLED', 'DONE', 'WAITING']
let dateKeywordList = ['CREATED', 'SCHEDULED', 'DEADLINE', 'CLOSED', 'Refiled']
let sectionKeywordList = ['PROPERTIES', 'LOGBOOK', 'END']

let propertiesSection = {} // TODO properties listing
let logBookSection = {} // TODO logbook listing

let statistics = {
	tags: {},
	words: {},
	dates: {
		havingDate: 0,
		havingNoDate: 0,
		oldEst: 0,
		mostRecent: 0,
		years: {},
		weeks: {},
		months: {},
		days: {}
	}
}

let headerKeywordSearch = '[' + stateKeywordList.join('|') + ']'
/**
 * task object example
 * @type {{level: string, header: string, dates: {CREATED: string, DONE: string, REFILED: string}, state: string, content: string, properties: {}, tags: [], tagsInherited: []}}
 */
let task = {
	header: '',
	level: '',
	corpus: '',
	state: '',
	tags: [],
	children: [], // TODO list children tasks with a reference to the parent when level is superior to previous task
	tagsInherited: [], // TODO inherit tags
	dates: {
		havingDate: 0,
		havingNoDate: 0,
		oldEst: 0,
		mostRecent: 0,
		years: {},
		weeks: {},
		months: {},
		days: {},
	},
	logbook: {},
	properties: {},
}

let isHeader = false
let isProperty = false
let isLogbook = false
let isFirst = true

// init first task object as empty clone
let currentTask = Object.create(task)

/**
 * add to tasks to export and refresh current task
 */
function addAndRefreshCurrentTask () {

	makeWordsStatistics(currentTask.header.trim())
	makeWordsStatistics(currentTask.corpus.trim())

	tasksObjectsForJsonExport.push(currentTask)
	// réinitialisation de tâche pour remplir de nouveau
	currentTask = Object.create(task)
	currentTask.dates = {}
	currentTask.tags = []
}

function makeWordsStatistics (sentence) {
	let split = sentence.split(' ')
	if (split && split.length) {

		split.forEach(word => {
			if (!statistics.words[word]) {
				statistics.words[word] = 0
			}
			statistics.words[word]++
		})
	}
}

const dateStats = {
	created: 0,
	refiled: 0,
	closed: 0,
	cancelled: 0,
	scheduled: 0,
	deadline: 0,
	tasks_done: []
}

function fillPeriodTime (periodStat, keyword) {

	if (keyword === 'CLOSED') {
		periodStat.closed++
	}
	if (keyword === 'CREATED') {
		periodStat.created++
	}
	if (keyword === 'Refiled') {
		periodStat.refiled++
	}
	if (keyword === 'CANCELLED') {
		periodStat.cancelled++
	}
	if (keyword === 'SCHEDULED') {
		periodStat.scheduled++
	}
	if (keyword === 'DEADLINE') {
		periodStat.deadline++
	}
}

/**
 * pour chaque période de temps, compter les tâches créées et fermées
 * @param keyword
 * @param dateFoundElement
 */
function statisticDateFill (keyword, dateFoundElement, header) {

	// décompte par années

	let convertedDate = new Date(dateFoundElement)
	let yearOfDate = convertedDate.getFullYear()
	let monthOfDate = yearOfDate + '-' + convertedDate.getMonth()
	// add zeros
	let convertedWeek = moment(convertedDate).week() < 10 ? '0' + moment(convertedDate).week() : moment(convertedDate).week()
	let weekOfDate = yearOfDate + '-' + convertedWeek

	let convertedMonth = convertedDate.getMonth() < 10 ? '0' + convertedDate.getMonth() : convertedDate.getMonth()
	let convertedDay = convertedDate.getDay() < 10 ? '0' + convertedDate.getDay() : convertedDate.getDay()
	let dayOfDate = convertedDate.getFullYear() + '-' + convertedMonth + '-' + convertedDay

	if (!statistics.dates.years[yearOfDate]) {
		statistics.dates.years[yearOfDate] = Object.create(dateStats)
	}
	fillPeriodTime(statistics.dates.years[yearOfDate], keyword)

	// par année-semaine
	if (!statistics.dates.weeks[weekOfDate]) {
		statistics.dates.weeks[weekOfDate] = Object.create(dateStats)
	}
	fillPeriodTime(statistics.dates.weeks[weekOfDate], keyword)
	statistics.dates.weeks[weekOfDate].tasks_done.push(header)
	// décompte par mois
	if (!statistics.dates.months[monthOfDate]) {
		statistics.dates.months[monthOfDate] = Object.create(dateStats)
	}
	fillPeriodTime(statistics.dates.months[monthOfDate], keyword)

	// décompte par jours

	if (!statistics.dates.days[dayOfDate]) {
		statistics.dates.days[dayOfDate] = Object.create(dateStats)
	}
	fillPeriodTime(statistics.dates.days[dayOfDate], keyword)
	statistics.dates.days[dayOfDate].tasks_done.push(header)
}

function findOldestDate (currentDate) {
	// trouver la plus ancienne date

	if (!statistics.dates.oldEst) {
		statistics.dates.oldEst = currentDate
	} else {
		var beginningTime = moment(statistics.dates.oldEst)
		var endTime = moment(currentDate)
		if (!beginningTime.isBefore(endTime)) {
			statistics.dates.oldEst = currentDate
		}
	}
}

/**********************
 * loop to parse all
 *********************/
fs.readFile(sourceFilePath, 'utf8', function (err, data) {

	if (err) {
		return console.log(err)
	}
	console.log(' parsing...')
	// parcourir chaque ligne du fichier org
	let everyline = data.split('\n')

	// trouver les entêtes toutes les lignes qui commencent par * et espace.

	everyline.forEach((line) => {

		// gérer la création d'objets définissant les tâches et leurs propriétés
		if (line.match(/^\*+? /)) {
			// add last task to export list
			if (!isFirst) {

				addAndRefreshCurrentTask()
			} else {
				isFirst = false
			}

			isHeader = true
			// compter les étoiles pour trouver le niveau du header
			if (line.match(/\*/g)) {

				let match = line.match(/\*/g)
				currentTask.level = match.length
			}

			// create a new task

			headers.push(cleanHeader(line))
			currentTask.header = cleanHeader(line)
			stateKeywordList.forEach(keyword => {
				let keywordIsFound = lineHasKeyword(line, keyword)

				if (keywordIsFound) {
					currentTask.state = keyword
				}
			})

			// trouver les tags
			let tagsList = line.match(/\:([\w\_]*)\:/g)
			if (tagsList) {
				tagsList = tagsList[0]
				let tagList = tagsList.split(':')
				if (tagList.length) {

					tagList.forEach(tag => {
						if (tag.length > 1) {

							if (!statistics.tags[tag]) {
								statistics.tags[tag] = 0
							}
							statistics.tags[tag]++

							currentTask.tags.push(tag)
						}
					})
				}
			}

			// ------------- fin des recherches dans la ligne de Header -------------
		} else {
			isHeader = false
		}
		// examen des lignes de corps de tâche, ou de corps de section suite au header.
		// classer les dates de création, cloture, et de logbook
		let dateFound = searchDate(line)
		if (dateFound) {
			/**
			 * we have found a date in the current line
			 */

			statistics.dates.havingDate += 1

			dateKeywordList.forEach(keyword => {
				if (lineHasSubstring(line, keyword)) {
					if (!currentTask.dates[keyword]) {
						currentTask.dates[keyword] = ''
					}

					let convertedDate = dateFound[0].substring(0, 10)

					if (dateFound[0].length === 15) {
						// sans heure: "2022-12-21 mer."
						convertedDate = moment(dateFound[0], 'YYYY-MM-DD ddd')

					} else if (dateFound[0].length === 21) {
						// avec heure: "2022-11-01 mar. 00:44"
						convertedDate = moment(dateFound[0], 'YYYY-MM-DD ddd HH:mm')
					}
					let formattedDate = moment(convertedDate).format()
					// console.log('currentTask.header', currentTask.header)
					statisticDateFill(keyword, convertedDate, currentTask.header)
					findOldestDate(convertedDate)
					currentTask.dates[keyword] = formattedDate

				} else {
					// console.log('keyword', keyword)
				}
			})
		} else {
			statistics.dates.havingNoDate += 1
			if (
				line.indexOf(dateKeywordList) !== -1 &&
				line.indexOf(stateKeywordList) !== -1 &&
				line.indexOf(sectionKeywordList) !== -1
			) {

				// ajouter le corps complet de la section après le header
				if (line.length && !isHeader) {

					let cleanedLine = line.replace(/\s\s/g, ' ')
					cleanedLine = line.replace(/ {2,}/g, ' ')

					cleanedLine = cleanedLine.trim()

					currentTask.corpus += `${cleanedLine}
`
				}
			}
		}
	})

	// ajouter la dernière tâche parsée
	addAndRefreshCurrentTask()

	console.log('tasks : ', tasksObjectsForJsonExport.length)
	console.log(tada + ' parsing fini ' + tada)

	// ranger par valeur décroissante les tags

	let sorted_stats = []
	// rangement par valeur et par date
	console.log('write file ', outputAbsolutePath, outputFileNameJson)
	statistics.dates.years = sortByKey(statistics.dates.years)
	statistics.dates.weeks = sortByKey(statistics.dates.weeks)
	statistics.dates.months = sortByKey(statistics.dates.months)
	statistics.dates.days = sortByKey(statistics.dates.days)

	statistics = sortByKey(statistics)

	const jsonContent = {
		statistics: {
			lines_count: everyline.length,
			headers_count: headers.length,
			statistics
		},
		meta_data: {
			author: '@tykayn@mastodon.Cipherbliss.com',
			generated_at: new Date(),
			generated_from_file: sourceFilePath + sourceFileName,
			sources: 'https://forge.chapril.org/tykayn/org-report-stats.git'
		},
		tasks_list: tasksObjectsForJsonExport
	}

	if (writeJsonAfterParse) {

		writeFileInOuputFolderFromJsonObject(outputFileNameJson, jsonContent)
	}

})

function lineHasKeyword (line, keyword = 'TODO') {

	let isFound = (line.indexOf('* ' + keyword) !== -1)
	if (isFound) {
		createNewHeaderKind(keyword)
		headersByKind[keyword].push(line)
		if (!statistics[keyword]) {
			statistics[keyword] = 0
		}
		statistics[keyword]++
	}
	return isFound
}

function lineHasSubstring (line, keyword) {
	let isFound = (line.indexOf(keyword) !== -1)
	if (!statistics[keyword]) {
		statistics[keyword] = 0
	}
	statistics[keyword]++

	return isFound
}

function createNewHeaderKind (keyword) {
	if (!headersByKind[keyword]) {
		headersByKind[keyword] = []
	}
}

/**
 * chercher des dates et heures au format
 * YYYY-MM-DD HH:II:SS
 *
 * @param line
 * @returns {*}
 */
function searchDate (line) {
	// return line.match(/[(\d{4}\-\d{2}\-\d{2} ?\d{2}?\:?\d{2}?\:?\d{2}?)(\d{4}\-\d{2}\-\d{2})]/)
	let simpleDay = line.match(/\d{4}\-\d{2}\-\d{2} \w{3}?\.?/)
	let simpleDayHour = line.match(/\d{4}\-\d{2}\-\d{2} \w{3}?\.? \d{2}\:\d{2}/)
	let simpleDayHourSec = line.match(/\d{4}\-\d{2}\-\d{2} \w{3}?\.? \d{2}\:\d{2}\:\d{2}/)

	if (simpleDayHourSec) {
		return simpleDayHourSec
	}

	if (simpleDayHour) {
		return simpleDayHour
	}
	if (simpleDay) {
		return simpleDay
	}

}

/**
 * get the cleaned content of the header
 * @param line
 */
function cleanHeader (line) {

	line = '' + line
	stateKeywordList.forEach(keyword => {
		line = line.replace(keyword, '')
	})
	line = line.replace(/\** /, '')
	line = line.replace(/\[.*\]/g, '')
	line = line.replace(/\:.*\:/g, '')
	line = line.replace('  ', '')
	return line.trim()
}

/**
 * ranger un objet littéral par ordre alphabétique de ses clés
 * @param objectStuff
 * @returns {{}}
 */
function sortByKey (objectStuff) {
	return Object.keys(objectStuff).sort().reduce(
		(obj, key) => {
			obj[key] = objectStuff[key]
			return obj
		},
		{}
	)
}

/**
 * ranger un objet littéral selon la valeur décroissante de ses paires
 * @param literalobject
 * @returns {any}
 */
function sortByValue (literalobject) {

	let sortable = []
	for (var keyName in literalobject) {
		sortable[keyName] = literalobject[keyName]
	}
	// return literalobject
	return sortable.sort(function (a, b) {
		return b[1] - a[1]
	})
}

export async function writeFileInOuputFolderFromJsonObject (fileName, jsonObjectThing) {

	// console.log('statistics.dates', statistics.dates)

	return await fs.writeFile(
		`${outputAbsolutePath}${fileName}`,
		JSON.stringify(jsonObjectThing, null, 2),
		'utf8',
		(err) => {
			if (err) {
				console.log(`Error writing file: ${err}`)
			} else {
				console.log(`\n ${gift} File ${fileName} is written successfully!`)
			}
		}
	)
}