'use strict';

const slug = require('slug'),
	xss = require('xss'),
	zxcvbn = require('zxcvbn'),
	moment = require('moment'),
	mw = require('../middleware.js'),
	User = require('../models.js').user,
	mail = require('../mail.js'),
	env = require('../env/env.js'),
	debug = require('debug')('tracman-settings'),
	router = require('express').Router();



// Settings form
router.route('/')
	.all( mw.ensureAuth, (req,res,next)=>{
		next();
	} )

	// Get settings form
	.get( (req,res)=>{
		res.render('settings', {active:'settings'});
	} )

	// Set new settings
	.post( (req,res,next)=>{
		
		// Validate email
		const checkEmail = new Promise( (resolve,reject)=>{
			
			// Check validity
			if (!mw.validateEmail(req.body.email)) {
				req.flash('warning', `<u>${req.body.email}</u> is not a valid email address.  `);
				resolve();
			}
			
			// Check if unchanged
			else if (req.user.email===req.body.email) {
				resolve();
			}
			
			// Check uniqueness
			else {
				User.findOne({ email: req.body.email })
				.then( (existingUser)=>{
					
					// Not unique!
					if (existingUser && existingUser.id!==req.user.id) {
						debug("Email not unique!");
						req.flash('warning', `That email, <u>${req.body.email}</u>, is already in use by another user! `);
						resolve();
					}
					
					// It's unique
					else {
						debug("Email is unique");
						req.user.newEmail = req.body.email;
				
						// Create token
						debug(`Creating email token...`);
						req.user.createEmailToken((err,token)=>{
							if (err){ reject(err); }
							
							// Send token to user by email
							debug(`Mailing new email token to ${req.body.email}...`);
							mail.send({
								to: `"${req.user.name}" <${req.body.email}>`,
								from: mail.noReply,
								subject: 'Confirm your new email address for Tracman',
								text: mail.text(`A request has been made to change your Tracman email address.  If you did not initiate this request, please disregard it.  \n\nTo confirm your email, follow this link:\n${env.url}/settings/email/${token}. `),
								html: mail.html(`<p>A request has been made to change your Tracman email address.  If you did not initiate this request, please disregard it.  </p><p>To confirm your email, follow this link:<br><a href="${env.url}/settings/email/${token}">${env.url}/settings/email/${token}</a>. </p>`)
							})
							.then( ()=>{
								req.flash('warning',`An email has been sent to <u>${req.body.email}</u>.  Check your inbox to confirm your new email address. `);
								resolve();
							})
							.catch(reject);
							
						});
						
					}
			
				})
				.catch(reject);
			}
			
		});
		
		// Validate slug
		const checkSlug = new Promise( (resolve,reject)=>{
			
			// Check existence
			if (req.body.slug==='') {
				req.flash('warning', `You must supply a slug.  `);
				resolve();
			}
			
			// Check if unchanged
			else if (req.user.slug===slug(xss(req.body.slug))) {
				resolve();
			}
				
			// Check uniqueness
			else {
				
				User.findOne({ slug: req.body.slug })
				.then( (existingUser)=>{
					
					// Not unique!
					if (existingUser && existingUser.id!==req.user.id) {
						req.flash('warning', `That slug, <u>${req.body.slug}</u>, is already in use by another user! `);
					}
					
					// It's unique
					else {
						req.user.slug = slug(xss(req.body.slug));
					}
			
				})
				.then(resolve)
				.catch(reject);
				
			}
			
		});
		
		// Set settings when done
		Promise.all([checkEmail, checkSlug])
		.then( ()=>{
			debug('Setting settings... ');
				
			// Set values
			req.user.name = xss(req.body.name);
			req.user.settings = {
				units: req.body.units,
				defaultMap: req.body.map,
				defaultZoom: req.body.zoom,
				showScale: (req.body.showScale)?true:false,
				showSpeed: (req.body.showSpeed)?true:false,
				showAlt: (req.body.showAlt)?true:false,
				showStreetview: (req.body.showStreet)?true:false,
				marker: req.body.marker
			};
			
			// Save user and send response
			debug(`Saving new settings for user ${req.user.name}...`);
			req.user.save()
			.then( ()=>{
				debug(`DONE!  Redirecting user...`);
				req.flash('success', 'Settings updated. ');
				res.redirect('/settings');
			})
			.catch( (err)=>{
				mw.throwErr(err,req);
				res.redirect('/settings');
			});
			
		})
		.catch( (err)=>{
			mw.throwErr(err,req);
			res.redirect('/settings');
		});
		
	} );

// Delete account
router.get('/delete', (req,res)=>{
	User.findByIdAndRemove(req.user)
	.then( ()=>{
		req.flash('success', 'Your account has been deleted. ');
		res.redirect('/');
	})
	.catch( (err)=>{
		mw.throwErr(err,req);
		res.redirect('/settings');
	});
});

// Confirm email address
router.get('/email/:token', mw.ensureAuth, (req,res,next)=>{
	
	// Check token
	if ( req.user.emailToken===req.params.token) {
		
		// Set new email
		req.user.email = req.user.newEmail;
		req.user.save()
		
		// Delete token and newEmail
		.then( ()=>{
			req.user.emailToken = undefined;
			req.user.newEmail = undefined;
			req.user.save();
		})
		
		// Report success
		.then( ()=>{
			req.flash('success',`Your email has been set to <u>${req.user.email}</u>. `);
			res.redirect('/settings');
		})
		
		.catch( (err)=>{
			mw.throwErr(err,req);
			res.redirect(req.session.next||'/settings');
		});
		
	}
	
	// Invalid token
	else {
		req.flash('danger', 'Email confirmation token is invalid. ');
		res.redirect('/settings');
	}
	
} );

// Set password
router.route('/password')
	.all( mw.ensureAuth, (req,res,next)=>{
		next();
	} )

	// Email user a token, proceed at /password/:token
	.get( (req,res,next)=>{

		// Create token for password change
		req.user.createPassToken( (err,token,expires)=>{
			if (err){
				mw.throwErr(err,req);
				res.redirect((req.user)?'/settings':'/login');
			}
			else {
			
				// Figure out expiration time
				let expirationTimeString = (req.query.tz)?
					moment(expires).utcOffset(req.query.tz).toDate().toLocaleTimeString(req.acceptsLanguages[0]):
					moment(expires).toDate().toLocaleTimeString(req.acceptsLanguages[0])+" UTC";
				
				// Confirm password change request by email.
				mail.send({
					to: mail.to(req.user),
					from: mail.noReply,
					subject: 'Request to change your Tracman password',
					text: mail.text(`A request has been made to change your tracman password.  If you did not initiate this request, please contact support at keith@tracman.org.  \n\nTo change your password, follow this link:\n${env.url}/settings/password/${token}. \n\nThis request will expire at ${expirationTimeString}. `),
					html: mail.html(`<p>A request has been made to change your tracman password.  If you did not initiate this request, please contact support at <a href="mailto:keith@tracman.org">keith@tracman.org</a>.  </p><p>To change your password, follow this link:<br><a href="${env.url}/settings/password/${token}">${env.url}/settings/password/${token}</a>. </p><p>This request will expire at ${expirationTimeString}. </p>`)
				})
				.then( ()=>{
					// Alert user to check email.
					req.flash('success',`An link has been sent to <u>${req.user.email}</u>.  Click on the link to complete your password change.  This link will expire in one hour (${expirationTimeString}). `);
					res.redirect((req.user)?'/settings':'/login');
				})
				.catch( (err)=>{
					mw.throwErr(err,req);
					res.redirect((req.user)?'/settings':'/login');
				});
			
			}
		});

	} );

router.route('/password/:token')

	// Check token
	.all( (req,res,next)=>{
		debug('/settings/password/:token .all() called');
		User
			.findOne({'auth.passToken': req.params.token})
			.where('auth.passTokenExpires').gt(Date.now())
			.then((user) => {
				if (!user) {
					debug('Bad token');
					req.flash('danger', 'Password reset token is invalid or has expired. ');
					res.redirect( (req.isAuthenticated)?'/settings':'/login' );
				}
				else {
					debug('setting passwordUser');
					res.locals.passwordUser = user;
					next();
				}
			})
			.catch((err)=>{
				mw.throwErr(err,req);
				res.redirect('/password');
			});
	} )

	// Show password change form
	.get( (req,res)=>{
		debug('/settings/password/:token .get() called');
		res.render('password');
	} )
	
	// Set new password
	.post( (req,res,next)=>{
		
		// Validate password
		let zxcvbnResult = zxcvbn(req.body.password);
		if (zxcvbnResult.crack_times_seconds.online_no_throttling_10_per_second < 864000) { // Less than ten days
			mw.throwErr(new Error(`That password could be cracked in ${zxcvbnResult.crack_times_display.online_no_throttling_10_per_second}!  Come up with a more complex password that would take at least 10 days to crack. `));
			res.redirect(`/settings/password/${req.params.token}`);
		}
		
		else {
			
			// Create hashed password and save to db
			res.locals.passwordUser.generateHashedPassword( req.body.password, (err)=>{
				if (err){
					mw.throwErr(err,req);
					res.redirect(`/password/${req.params.token}`);
				}
				
				// User changed password
				else if (req.user) {
					req.flash('success', 'Your password has been changed. ');
					res.redirect('/settings');
				}
				
				// New user created password
				else {
					req.flash('success', 'Password set.  You can use it to log in now. ');
					res.redirect('/login?next=/map?new=1');
				}
				
			} );
			
		}
		
	} );


// Tracman pro
router.route('/pro')
	.all( mw.ensureAuth, (req,res,next)=>{
		next();
	} )

	// Get info about pro
	.get( (req,res,next)=>{
		res.render('pro');
	} )

	// Join Tracman pro
	.post( (req,res)=>{
		User.findByIdAndUpdate(req.user.id,
				{$set:{ isPro:true }})
			.then( (user)=>{
				req.flash('success','You have been signed up for pro. ');
				res.redirect('/settings');
			})
			.catch( (err)=>{
				mw.throwErr(err,req);
				res.redirect('/settings/pro');	
			});
	} );

module.exports = router;