/* global $rdf */

// Solid-UI temporary preferences

// ==============================

//

import * as debug from './debug'

const kb = require('./store')

const ns = require('./ns')

const authn = require('./authn/authn')

const widgets = require('./widgets')

const pad = require('./pad')

// This was tabulator . preferences in the tabulator

//

module.exports = {

// used for storing user name

value: [],

get: function (k) {

// original

return this.value[k]

},

set: function (k, v) {

if (typeof v !== 'string') {

debug.log('Non-string value of preference ' + k + ': ' + v)

throw new Error('Non-string value of preference ' + k + ': ' + v)

}

this.value[k] = v

},

renderPreferencesForm,

recordSharedPreferences,

getPreferencesForClass

}

// In a solid world, Preferences are stored in the web

//

// Make an RDF node for recording the common view preferences for any object

// (maybe make it in a separate file?)

function recordSharedPreferences (subject, context) {

return new Promise(function (resolve, reject) {

var sharedPreferences = kb.any(subject, ns.ui('sharedPreferences'))

if (!sharedPreferences) {

const sp = $rdf.sym(subject.doc().uri + '#SharedPreferences')

const ins = [

$rdf.st(subject, ns.ui('sharedPreferences'), sp, subject.doc())

]

debug.log('Creating shared preferences ' + sp)

kb.updater.update([], ins, function (uri, ok, errorMessage) {

if (!ok) {

reject(new Error('Error creating shared prefs: ' + errorMessage))

} else {

context.sharedPreferences = sp

resolve(context)

}

})

} else {

context.sharedPreferences = sharedPreferences

resolve(context)

}

})

}

// Construct a personal defaults node in the preferences file for a given class of object

//

function recordPersonalDefaults (theClass, context) {

return new Promise(function (resolve, reject) {

authn.logInLoadPreferences(context).then(

context => {

if (!context.preferencesFile) {

debug.log(

'Not doing private class preferences as no access to preferences file. ' +

context.preferencesFileError

)

return

}

var regs = kb.each(

null,

ns.solid('forClass'),

theClass,

context.preferencesFile

)

var ins = []

var prefs

var reg

if (regs.length) {

// Use existing node if we can

regs.forEach(r => {

prefs = prefs || kb.any(r, ns.solid('personalDefaults'))

})

if (prefs) {

context.personalDefaults = prefs // Found one

resolve(context)

return

} else {

prefs = widgets.newThing(context.preferencesFile)

reg = regs[0]

}

} else {

// no regs fo class

reg = widgets.newThing(context.preferencesFile)

ins = [

$rdf.st(

reg,

ns.rdf('type'),

ns.solid('TypeRegistration'),

context.preferencesFile

),

$rdf.st(reg, ns.solid('forClass'), theClass, context.preferencesFile)

]

}

prefs = widgets.newThing(context.preferencesFile)

ins.push(

$rdf.st(

reg,

ns.solid('personalDefaults'),

prefs,

context.preferencesFile

)

)

kb.updater.update([], ins, function (uri, ok, errm) {

if (!ok) {

reject(new Error('Setting preferences for ' + theClass + ': ' + errm))

} else {

context.personalDefaults = prefs

resolve(context)

}

})

},

err => {

reject(err)

}

)

})

}

function renderPreferencesForm (subject, theClass, preferencesForm, context) {

var prefContainer = context.dom.createElement('div')

pad.participationObject(subject, subject.doc(), context.me).then(

participation => {

const dom = context.dom

function heading (text) {

prefContainer.appendChild(dom.createElement('h5')).textContent = text

}

heading('My view of this ' + context.noun)

widgets.appendForm(

dom,

prefContainer,

{},

participation,

preferencesForm,

subject.doc(),

(ok, mes) => {

if (!ok) widgets.complain(context, mes)

}

)

heading("Everyone's view of this " + context.noun)

recordSharedPreferences(subject, context).then(context => {

var sharedPreferences = context.sharedPreferences

widgets.appendForm(

dom,

prefContainer,

{},

sharedPreferences,

preferencesForm,

subject.doc(),

(ok, mes) => {

if (!ok) widgets.complain(context, mes)

}

)

heading('My default view of any ' + context.noun)

recordPersonalDefaults(theClass, context).then(

context => {

widgets.appendForm(

dom,

prefContainer,

{},

context.personalDefaults,

preferencesForm,

context.preferencesFile,

(ok, mes) => {

if (!ok) widgets.complain(context, mes)

}

)

},

err => {

widgets.complain(context, err)

}

)

})

},

err => {

// parp object fails

prefContainer.appendChild(widgets.errorMessageBlock(context.dom, err))

}

)

return prefContainer

}

// This should be part of rdflib.js ad part of the RDFJS Standard!!

function toJS (term) {

if (!term.datatype) return term // Objects remain objects

if (term.datatype.equals(ns.xsd('boolean'))) {

return term.value === '1'

}

if (

term.datatype.equals(ns.xsd('dateTime')) ||

term.datatype.equals(ns.xsd('date'))

) {

return new Date(term.value)

}

if (

term.datatype.equals(ns.xsd('integer')) ||

term.datatype.equals(ns.xsd('float')) ||

term.datatype.equals(ns.xsd('decimal'))

) {

return Number(term.value)

}

return term.value

}

// This is the function which acuakly reads and combines the preferences

//

// @@ make it much more tolerant of missing buts of prefernces

function getPreferencesForClass (subject, theClass, predicates, context) {

return new Promise(function (resolve, reject) {

recordSharedPreferences(subject, context).then(context => {

var sharedPreferences = context.sharedPreferences

if (context.me) {

pad

.participationObject(subject, subject.doc(), context.me)

.then(participation => {

recordPersonalDefaults(theClass, context).then(context => {

var results = []

var personalDefaults = context.personalDefaults

predicates.forEach(pred => {

// Order of preference: My settings on object, Global settings on object, my settings on class

const v1 =

kb.any(participation, pred) ||

kb.any(sharedPreferences, pred) ||

kb.any(personalDefaults, pred)

if (v1) {

results[pred.uri] = toJS(v1)

}

})

resolve(results)

}, reject)

}, reject)

} else {

// no user defined, just use common prefs

var results = []

predicates.forEach(pred => {

const v1 = kb.any(sharedPreferences, pred)

if (v1) {

results[pred.uri] = toJS(v1)

}

})

resolve(results)

}

})

})

}

// ends