import Vue from 'vue'
import router from '@/router'

import api from '@/api'
import {
  AllTags
} from '@/api/queries'
import {
  parseNodesQueryParams,
  getUniqueNodesIds,
  getRelatedNodesIds,
  buildTree
} from '@/store/utils.js'


export default {
  state: {
    trees: {},
    nodebook: undefined,

    // LibraryOptions options
    strangeness: [0, 1, 2, 3, 4],
    tagsOptions: [],
    // LibraryOptions state
    mode: undefined,
    nodeDepartId: undefined,
    search: ''
  },

  mutations: {
    // ╷  ╶┬╴┌─╮┌─╮╭─┐┌─╮╷ ╷
    // │   │ │╶┤├┬╯├─┤├┬╯╰─┤
    // ╰─╴╶┴╴└─╯╵ ╰╵ ╵╵ ╰╶─╯

    'SET_NODEBOOK' (state, nodes) {
      state.nodebook = nodes
    },

    'ADD_NODEBOOK_NODE' (state, [stack, parentId, childId]) {
      if (stack === undefined) {
        stack = childId === undefined ? [parentId] : [parentId, childId]
        state.nodebook.push(stack)
      } else {
        stack.push(childId)
      }
    },

    'REMOVE_NODEBOOK_NODE' (state, [stack, nodeId]) {
      if (stack[0] === nodeId) {
        state.nodebook.splice(state.nodebook.indexOf(stack), 1)
      } else {
        stack.splice(stack.indexOf(nodeId), 1)
      }
    },

    'ADD_NODE_TREE' (state, [id, tree]) {
      Vue.set(state.trees, id, tree)
    },

    // ╭─╮┌─╮╶┬╴╶┬╴╭─╮╭╮╷╭─╴
    // │ │├─╯ │  │ │ ││││╰─╮
    // ╰─╯╵   ╵ ╶┴╴╰─╯╵╰╯╶─╯

    'SET_TAGS_OPTIONS' (state, tags) {
      state.tagsOptions = tags.map(tag => ({ value: tag.id, text: tag.name }))
    },

    'SET_MODE' (state, mode) {
      state.mode = mode
    },

    'SET_NODE_DEPART_ID' (state, id) {
      state.nodeDepartId = id
    },

    'SET_SEARCH' (state, str) {
      state.search = str
    }
  },

  actions: {
    // ╷  ╶┬╴┌─╮┌─╮╭─┐┌─╮╷ ╷
    // │   │ │╶┤├┬╯├─┤├┬╯╰─┤
    // ╰─╴╶┴╴└─╯╵ ╰╵ ╵╵ ╰╶─╯

    async 'INIT_LIBRARY' ({ state, commit, dispatch, rootState }) {
      const departIds = await dispatch('GET_ALL_NODES_IDS', 'depart')
      await dispatch('GET_NODES', { ids: departIds, dataLevel: 'initial' })
      dispatch('GET_ALL_TAGS')
      return departIds
    },

    async 'INIT_LIBRARY_TREE' ({ state, commit, dispatch, rootState }) {
      const ids = await dispatch('INIT_LIBRARY')
      return dispatch('SET_NODE_DEPART_ID', ids[ids.length - 1])
    },

    async 'INIT_LIBRARY_MAP' ({ state, commit, dispatch }) {
      const departIds = await dispatch('INIT_LIBRARY')
      const departNodes = await dispatch('GET_NODES', { ids: departIds.slice(0, 3), dataLevel: 'partial' })
      const relatedIds = getRelatedNodesIds(departNodes)
      const relatedNodes = await dispatch('GET_NODES', { ids: relatedIds, dataLevel: 'partial' })
      return [...departNodes, ...relatedNodes]
    },

    async 'INIT_LIBRARY_LIST' ({ state, commit, dispatch }) {
      const departIds = await dispatch('INIT_LIBRARY')
      return dispatch('GET_NODES', { ids: departIds, dataLevel: 'partial' })
    },

    async 'UPDATE_NODEBOOK' ({ state, commit, dispatch }, query) {
      const { mode = 'tree', nodebook } = parseNodesQueryParams(query)
      commit('SET_MODE', mode)
      await dispatch('GET_NODES', { ids: [].concat(...nodebook), dataLevel: 'full' })
      commit('SET_NODEBOOK', nodebook)
    },

    // ╭╮╷╭─╮┌─╮┌─╴╭─╴
    // ││││ ││ │├─╴╰─╮
    // ╵╰╯╰─╯└─╯╰─╴╶─╯

    'UPDATE_QUERY_NODES' ({ state }, from) {
      const query = {
        mode: state.mode,
        nodes: [...state.nodebook.map(ids => ids.join(','))]
      }
      router.push({ query })
    },

    async 'OPEN_NODE' ({ state, commit, dispatch }, [parentId, childId]) {
      const stack = state.nodebook.find(stack => stack[0] === parentId)
      if (stack && (childId === undefined || stack.includes(childId))) return
      commit('ADD_NODEBOOK_NODE', [stack, parentId, childId])
      dispatch('UPDATE_QUERY_NODES')
    },

    'CLOSE_NODE' ({ state, commit, dispatch }, [parentId, childId]) {
      const stack = state.nodebook.find(stack => stack.includes(parentId) && (childId ? stack.includes(childId) : true))
      commit('REMOVE_NODEBOOK_NODE', [stack, childId || parentId])
      dispatch('UPDATE_QUERY_NODES')
    },

    // ╭─╮┌─╮╶┬╴╶┬╴╭─╮╭╮╷╭─╴
    // │ │├─╯ │  │ │ ││││╰─╮
    // ╰─╯╵   ╵ ╶┴╴╰─╯╵╰╯╶─╯

    'GET_ALL_TAGS' ({ state, commit }) {
      if (state.tags !== undefined) return state.tags
      return api.query(AllTags).then(data => {
        commit('SET_TAGS_OPTIONS', data.tags)
        return state.tags
      })
    },

    async 'SET_NODE_DEPART_ID' ({ state, rootState, commit, dispatch, getters }, id) {
      if (state.nodeDepartId === id) return

      commit('SET_NODE_DEPART_ID', id)

      if (!(id in state.trees)) {
        const treeData = await api.queryRecursiveNodes([id])
        const nodes = await dispatch('GET_NODES', { ids: getUniqueNodesIds(treeData), dataLevel: 'initial' })
        commit('ADD_NODE_TREE', [id, buildTree(treeData, nodes)])
      }

      return getters.nodeTree
    },

    'UPDATE_QUERY_MODE' (store, mode) {
      if (router.currentRoute.query.mode === mode) return
      router.push({ query: { mode } })
    }
  },

  getters: {
    // LibraryOptions state
    mode: state => state.mode,
    nodeDepartId: state => state.nodeDepartId,
    search: state => state.search,

    // LibraryOptions options
    tagsOptions: state => state.tagsOptions,

    nodesDepartsOptions: (state, getters, rootState) => {
      const departIds = rootState.ids.depart
      if (departIds === undefined || rootState.nodes[departIds[0]] === undefined) return
      return departIds.map(id => {
        const text = rootState.nodes[id]
        const firstAuthor = text.authors !== null ? text.authors[0].name : 'Pad de noms'
        return {
          text: `${firstAuthor}, ${text.title} (${id})`,
          value: id
        }
      })
    },

    // Library
    nodebook: (state, getters, rootState) => {
      if (!state.nodebook) return []
      return state.nodebook.map(([parentId, ...childrenIds]) => {
        return {
          parent: rootState.nodes[parentId],
          children: childrenIds.map(id => rootState.nodes[id])
        }
      })
    },

    // LibraryList
    orderedTextsDepart: (state, getters, rootState) => {
      const departIds = rootState.ids.depart
      if (departIds === undefined || rootState.nodes[departIds[0]] === undefined) return
      return rootState.ids.depart.map(id => rootState.nodes[id]).sort((a, b) => {
        if (!b.authors) return -1
        if (!a.authors) return +1
        if (a.authors[0].last_name < b.authors[0].last_name) return -1
        if (a.authors[0].last_name > b.authors[0].last_name) return 1
        return 0
      }).reduce((dict, text) => {
        const firstChar = text.authors ? text.authors[0].last_name[0] : 'Pas de noms'
        if (!(firstChar in dict)) dict[firstChar] = []
        dict[firstChar].push(text)
        return dict
      }, {})
    },

    // LibraryTree
    nodeTree: (state, rootState) => {
      return state.trees[state.nodeDepartId] || { nodes: [], links: [] }
    },

    // Commons
    activeNodes: state => {
      if (!state.nodebook) return []
      return state.nodebook.reduce((acc, ids) => [...acc, ...ids], [])
    }
  }
}