import { createStore } from 'vuex'
import { getHouseholdByPerson, getCoursesByPerson, getRelationshipsByPerson } from './api'
import { getHouseholdLabel, getHouseholdWidth, getRelationshipLabel, getRelationshipTitle, getRelationshipDirection, splitId, getGender, getAge } from './vis-network'
import {visMessages} from "./i18n";

const debug = process.env.NODE_ENV !== 'production'

const store = createStore({
    strict: debug,
    state: {
        persons: [],
        households: [],
        courses: [],
        relationships: [],
        links: [],
        whitelistIds: [],
        personLoadedIds: [],
        householdLoadingIds: [],
        courseLoadedIds: [],
        relationshipLoadedIds: [],
        excludedNodesIds: []
    },
    getters: {
        nodes(state) {
            let nodes = []
            state.persons.forEach(p => {
                nodes.push(p)
            })
            state.households.forEach(h => {
                nodes.push(h)
            })
            state.courses.forEach(c => {
                nodes.push(c)
            })
            // except excluded nodes (unchecked layers)
            state.excludedNodesIds.forEach(excluded => {
                nodes = nodes.filter(n => n.id !== excluded)
            })
            return nodes
        },
        edges(state) {
            let edges = []
            state.links.forEach(l => {
                edges.push(l)
            })
            return edges
        },
        isInWhitelist: (state) => (person_id) => {
            return state.whitelistIds.includes(person_id)
        },
        isHouseholdLoading: (state) => (household_id) => {
            return state.householdLoadingIds.includes(household_id)
        },
        isCourseLoaded: (state) => (course_id) => {
            return state.courseLoadedIds.includes(course_id)
        },
        isRelationshipLoaded: (state) => (relationship_id) => {
            return state.relationshipLoadedIds.includes(relationship_id)
        },
        isPersonLoaded: (state) => (person_id) => {
            return state.personLoadedIds.includes(person_id)
        },
        isExcludedNode: (state) => (id) => {
            return state.excludedNodesIds.includes(id)
        },

        getParticipationsByCourse: (state) => (course_id) => {
            //console.log('getParticipationsByCourse', course_id)
            const course = state.courses.filter(c => c.id === course_id)[0]
            const currentParticipations = course.participations.filter(p => p.endDate === null)
            console.log('get persons in', course_id, currentParticipations.map(p => p.person.id),
                'with folded', currentParticipations.filter(p => p.person.folded === true).map(p => p.person.id))
            return currentParticipations
        },

        getMembersByHousehold: (state) => (household_id) => {
            //console.log('getMembersByHousehold', household_id)
            const household = state.households.filter(h => h.id === household_id)[0]
            const currentMembers = household.members.filter(m => household.current_members_id.includes(m.id))
            console.log('get persons in', household_id, currentMembers.map(m => m.person.id),
                'with folded', currentMembers.filter(m => m.person.folded === true).map(m => m.person.id))
            return currentMembers
        },

        /**
         * This getter compare input array (participations|members) to personLoadedIds array
         * It return an array of folded persons
         */
        getFoldedPersons: (state) => (array) => {
            let folded = []
            array.forEach(item => {
                let id = (typeof item.person._id !== 'undefined') ? item.person._id : item.person.id
                if (state.personLoadedIds.includes(id)) {
                    folded.push(state.persons.filter(person => person._id === id)[0])
                }
            })
            //console.log('array', array.map(r => r.person.id))
            console.log('get FoldedPersons', folded.map(f => f.id))
            return folded
        },


    },
    mutations: {
        addPerson(state, [person, options]) {
            //console.log('+ addPerson', person.id)

            person.group = person.type
            person._id = person.id
            person.id = `person_${person.id}`
            person.label = `*${person.text}*\n_${getGender(person.gender)} - ${getAge(person.birthdate)}_`
            person.folded = false

            if (options.folded) { // used by missing persons
                person.title = visMessages.fr.visgraph.click_to_expand
                person._label = person.label  // keep label
                person.label = null
                person.folded = true
            }

            state.persons.push(person)
        },
        addHousehold(state, household) {
            //console.log('+ addHousehold', household.id)

            household.group = household.type
            household._id = household.id
            household.label = `${visMessages.fr.visgraph.Household} n° ${household.id}`
            household.id = `household_${household.id}`

            state.households.push(household)
        },
        addCourse(state, course) {
           //console.log('+ addCourse', course.id)

            course.group = course.type
            course._id = course.id
            course.label = `${visMessages.fr.visgraph.Course} n° ${course.id}`
            course.id = `accompanying_period_${course.id}`

            state.courses.push(course)
        },
        addRelationship(state, relationship) {
           //console.log('+ addRelationship', relationship.id)

            relationship.group = relationship.type
            relationship._id = relationship.id
            relationship.id = `relationship_${relationship.id}`

           state.relationships.push(relationship)
        },
        addLink(state, link) {
           //console.log('+ addLink from', link.from, 'to', link.to)
           state.links.push(link)
        },

        //// id markers
        markInWhitelist(state, person) {
            state.whitelistIds.push(person.id)
        },
        markPersonLoaded(state, id) {
            state.personLoadedIds.push(id)
        },
            unmarkPersonLoaded(state, id) {
                state.personLoadedIds = state.personLoadedIds.filter(i => i !== id)
            },
        markHouseholdLoading(state, id) {
            //console.log('..loading household', id)
            state.householdLoadingIds.push(id)
        },
            unmarkHouseholdLoading(state, id) {
                state.householdLoadingIds = state.householdLoadingIds.filter(i => i !== id)
            },
        markCourseLoaded(state, id) {
            state.courseLoadedIds.push(id)
        },
            unmarkCourseLoaded(state, id) {
                state.courseLoadedIds = state.courseLoadedIds.filter(i => i !== id)
            },
        markRelationshipLoaded(state, id) {
            state.relationshipLoadedIds.push(id)
        },
            unmarkRelationshipLoaded(state, id) {
                state.relationshipLoadedIds = state.relationshipLoadedIds.filter(i => i !== id)
            },

        //// excluded
        addExcludedNode(state, id) {
            console.log('==> exclude list: +', id)
            state.excludedNodesIds.push(id)
        },
        removeExcludedNode(state, id) {
            console.log('<== exclude list: -', id)
            state.excludedNodesIds = state.excludedNodesIds.filter(e => e !== id)
        },

        //// unfold
        unfoldPerson(state, person) {
            if (person.folded === true) {
                console.log('unfoldPerson', person)
                person.label = person._label
                delete person._label
                delete person.title
                person.folded = false
            } else {
                console.log('person is not folded', person)
                //throw 'person is not folded'
            }
        }
    },
    actions: {
        /**
         *  1) Add a person in state
         *  @param object
         *  @param person
         */
        addPerson({ commit, dispatch }, person) {
            commit('markPersonLoaded', person.id)
            commit('addPerson', [person, { folded: false }])
            dispatch('fetchInfoForPerson', person)
        },

        /**
         *  2) Fetch infos for this person (hub)
         *  @param object
         *  @param person
         */
        fetchInfoForPerson({ dispatch }, person) {
            if (null !== person.current_household_id) {
                dispatch('fetchHouseholdForPerson', person)
            }
            dispatch('fetchCoursesByPerson', person)
            dispatch('fetchRelationshipByPerson', person)
        },

        /**
         *  3) Fetch person current household (if it is not already loading)
         *  check first isHouseholdLoading to fetch household once
         *  @param object
         *  @param person
         */
        fetchHouseholdForPerson({ commit, getters, dispatch }, person) {
            //console.log('  isHouseholdLoading ?', getters.isHouseholdLoading(person.current_household_id))
            if (! getters.isHouseholdLoading(person.current_household_id)) {
                commit('markHouseholdLoading', person.current_household_id)
                getHouseholdByPerson(person)
                    .then(household => new Promise(resolve => {
                        commit('addHousehold', household)
                        //dispatch('addExcludedNode', household.id)  // layer uncheck when added
                        dispatch('addLinkFromPersonsToHousehold', household)
                        resolve()
                        })
                    ).catch( () => {
                        commit('unmarkHouseholdLoading', person.current_household_id)
                })
            }
        },

        /**
         *  4) Add an edge for each household member (household -> person)
         *  @param object
         *  @param household
         */
        addLinkFromPersonsToHousehold({ commit, getters, dispatch }, household) {
            let members = getters.getMembersByHousehold(household.id)
            console.log('add link for', members.length, 'members')
            members.forEach(m => {
                commit('addLink', {
                    from: `${m.person.type}_${m.person.id}`,
                    to: `household_${m.person.current_household_id}`,
                    id: `p${m.person.id}-h${m.person.current_household_id}`,
                    arrows: 'from',
                    color: 'pink',
                    font: { color: '#D04A60' },
                    label: getHouseholdLabel(m),
                    width: getHouseholdWidth(m),
                })
                if (!getters.isPersonLoaded(m.person.id)) {
                    console.log('addMissingPerson from household', household.id)
                    dispatch('addMissingPerson', [m.person, household])
                }
            })
        },

        /**
         *  5) Fetch AccompanyingCourses for the person
         *  @param object
         *  @param person
         */
        fetchCoursesByPerson({ commit, dispatch }, person) {
            //console.log('fetchCoursesByPerson', person)
            getCoursesByPerson(person)
                .then(courses => new Promise(resolve => {
                    //console.log('fetch courses', courses.length)
                    dispatch('addCourses', courses)
                    resolve()
                }))
        },

        /**
         *  6) Add each distinct course
         *  @param object
         *  @param courses
         */
        addCourses({ commit, getters, dispatch }, courses) {
            //console.log('addCourse', courses)
            let currentCourses = courses.filter(c => c.closingDate === null)
            currentCourses.forEach(course => {
                //console.log('  isCourseLoaded ?', getters.isCourseLoaded(course.id))
                if (! getters.isCourseLoaded(course.id)) {
                    //console.log('course', course.id)
                    commit('markCourseLoaded', course.id)
                    commit('addCourse', course)
                    commit('addExcludedNode', course.id) // init: layer uncheck when added
                    dispatch('addLinkFromPersonsToCourse', course)
                }
            })
        },

        /**
         *  7) Add an edge for each course participation (course <- person)
         *  @param object
         *  @param course
         */
        addLinkFromPersonsToCourse({ commit, getters, dispatch }, course) {
            const participations = getters.getParticipationsByCourse(course.id)
            console.log('add link for', participations.length, 'participations')
            participations.forEach(p => {
                //console.log(p.person.id)
                commit('addLink', {
                    from: `${p.person.type}_${p.person.id}`,
                    to: `${course.id}`,
                    id: `p${p.person.id}-c`+ splitId(course.id,'id'),
                    arrows: 'from',
                    color: 'orange',
                    font: { color: 'darkorange' },
                })
                if (!getters.isPersonLoaded(p.person.id)) {
                    dispatch('addMissingPerson', [p.person, course])
                }
            })
        },

        /**
         *  8) Fetch Relationship
         *  @param object
         *  @param person
         */
        fetchRelationshipByPerson({ dispatch }, person) {
            //console.log('fetchRelationshipByPerson', person)
            getRelationshipsByPerson(person)
                .then(relationships => new Promise(resolve => {
                    //console.log('fetch relationships', relationships.length)
                    dispatch('addRelationships', relationships)
                    resolve()
                }))
        },

        /**
         *  9) Add each distinct relationship
         *  @param object
         *  @param relationships
         */
        addRelationships({ commit, getters, dispatch }, relationships) {
            relationships.forEach(relationship => {
                //console.log('  isRelationshipLoaded ?', getters.isRelationshipLoaded(relationship.id))
                if (! getters.isRelationshipLoaded(relationship.id)) {
                    //console.log('relationship', relationship.id)
                    commit('markRelationshipLoaded', relationship.id)
                    commit('addRelationship', relationship)
                    dispatch('addLinkFromRelationship', relationship)
                }
            })
        },

        /**
         *  10) Add an edge for each relationship (person -> person)
         *  @param object
         *  @param r (relationship)
         */
        addLinkFromRelationship({ commit, getters, dispatch }, r) {
            //console.log('-> addLink from person', r.fromPerson.id, 'to person', r.toPerson.id)
            commit('addLink', {
                from: `person_${r.fromPerson.id}`,
                to: `person_${r.toPerson.id}`,
                id: 'r' + splitId(r.id,'id') + '_p' + r.fromPerson.id + '_p' + r.toPerson.id,
                arrows: getRelationshipDirection(r),
                color: 'lightblue',
                font: { color: '#33839d' },
                dashes: true, //physics: false,
                label: getRelationshipLabel(r),
                title: getRelationshipTitle(r),
            })
            for (let person of [r.fromPerson, r.toPerson]) {
                if (!getters.isPersonLoaded(person.id)) {
                    dispatch('addMissingPerson', [person, r])
                }
            }
        },

        /**
         *  Add missing person. node is displayed without label (folded).
         *  We stop here and listen on events to unfold person and expand its fetch infos
         *  @param object
         *  @param array
         */
        addMissingPerson({ commit, getters, dispatch }, [person, parent]) {
            console.log('! add missing Person', person.id)
            commit('markPersonLoaded', person.id)
            commit('addPerson', [person, { folded: true }])
            if (getters.isExcludedNode(parent.id)) {
                commit('addExcludedNode', person.id) // init: exclude missing persons if parent is excluded
            }
        },

        /**
         * =============================================================================
         *
         * Triggered by a vis-network event when clicking on a Course Node.
         * Each folded node is unfold, then expanded with fetch infos
         * @param object
         * @param course
         */
        unfoldPersonsByCourse({ getters, commit, dispatch }, course) {
            const participations = getters.getParticipationsByCourse(course.id)
            getters.getFoldedPersons(participations)
            .forEach(person => {
                console.log('-=. unfold and expand person', person.id)
                commit('unfoldPerson', person)
                dispatch('fetchInfoForPerson', person)
            })
        },

        /**
         * Triggered by a vis-network event when clicking on a Household Node.
         * Each folded node is unfold, then expanded with fetch infos
         * @param object
         * @param household
         */
        unfoldPersonsByHousehold({ getters, commit, dispatch }, household) {
            const members = getters.getMembersByHousehold(household.id)
            getters.getFoldedPersons(members)
            .forEach(person => {
                console.log('-=. unfold and expand person', person.id)
                commit('unfoldPerson', person)
                dispatch('fetchInfoForPerson', person)
            })
        },

        /**
         * =============================================================================
         *
         * For an excluded node, add|remove relative persons excluded too
         * @param object
         * @param array (add|remove action, id)
         */
        excludedNode({ getters, commit }, [action, id]) {

            const personGroup = () => {
                switch (splitId(id, 'type')) {
                    case 'accompanying_period':
                        return getters.getParticipationsByCourse(id)
                    case 'household':
                        return getters.getMembersByHousehold(id)
                    default:
                        throw 'undefined case with this id'
                }
            }
            if (action === 'add') {
                commit('addExcludedNode', id)
                getters.getFoldedPersons(personGroup())
                .forEach(person => {
                    if (!getters.isInWhitelist(person.id)) {
                        commit('addExcludedNode', person.id)
                    }
                })
            }
            if (action === 'remove') {
                commit('removeExcludedNode', id)
                getters.getFoldedPersons(personGroup())
                .forEach(person => {
                    commit('removeExcludedNode', person.id)
                })
            }
        },

    }
})

export { store }