import { Component } from '@angular/core';

import { DataService } from '../core/data.service';
import { DegreePlan } from '../core/models/degree-plan';
import { Term } from '../core/models/term';
import { log } from 'util';

@Component({
	selector: 'cse-degree-planner',
	templateUrl: './degree-planner.component.html',
	styleUrls: ['./degree-planner.component.scss']
})

export class DegreePlannerComponent {
	degreePlans: DegreePlan[];
	degreePlanCourses: any[];
	selectedDegreePlan: number;
	terms: Term[];
	termsByAcademicYear: Object;

	constructor(private dataService: DataService) {
		this.dataService.getDegreePlans()
		.subscribe(data => {
			this.degreePlans = data;
			this.selectedDegreePlan = this.degreePlans[0].roadmapId;
		});

		this.dataService.getDegreePlannerCourseData()
		.subscribe(degreePlanCourses => {
			this.degreePlanCourses = degreePlanCourses;
			if (this.termsByAcademicYear) {
				this.updateCourses();
			}
		});

		this.dataService.getTerms()
		.subscribe(terms => {
			this.terms = terms;
			// Create an empty object to store term data in
			this.termsByAcademicYear = {};

			// Loop through each term
			this.terms.forEach(term => {
				// Get the 3 digit year code and 1 digit term code
				const year = term.termCode.substring(0, 3);
				const termCode = term.termCode.substring(3);

				// If this year does not exsist in the "termsByAcademicYear" create a new year
				// This year has placeholder data for each term in the year
				if (!this.termsByAcademicYear[year]) {
					this.termsByAcademicYear[year] = {
						year: year,
						terms: {
							2: { termCode: `${year}2`, courses: []},
							4: { termCode: `${year}4`, courses: []},
							6: { termCode: `${year}6`, courses: []}
						}
					};
				}

				// Overwrite the default term with the current term
				this.termsByAcademicYear[year].terms[termCode] = {...term, courses: []};

			});

			if (this.degreePlanCourses) {
				this.updateCourses();
			}
		});
	}

	updateCourses() {
		for (const term of this.degreePlanCourses) {
			// console.log(term);
			const yearCode = term.termCode.substring(0, 3);
			const termCode = term.termCode.substring(3);

			if (this.termsByAcademicYear[yearCode] && this.termsByAcademicYear[yearCode].terms[termCode]) {
				this.termsByAcademicYear[yearCode].terms[termCode].courses = term.courses;
			}
		}
	}

	getCoursesByTerm(termCode) {
		if (!this.degreePlanCourses) {
			return [];
		}

		for ( const term of this.degreePlanCourses ) {
			if (term.termCode === termCode) {
				return term.courses;
			}
		}

		return [];
	}

	getTermCodes() {
		if (!this.degreePlanCourses) {
			return false;
		}

		const termCodes = [];

		for (const yearCode in this.termsByAcademicYear) {
			if (this.termsByAcademicYear[yearCode]) {
				const year = this.termsByAcademicYear[yearCode];
				for (const termKey in year.terms) {
					if (year.terms[termKey]) {
						const term = year.terms[termKey];
						termCodes.push(term.termCode);
					}
				}
			}
		}
		return termCodes;
	}

}