import Vue from 'vue'

import api from '@/api'
import {
  DATA_LEVELS,
  ID_VARIANTS,
  VARIANT_IDS,
  RELATIONS // FIXME REMOVE WHEN DB MAJ
} from '@/store/utils'
import {
  AllNodesOfVariant
} from '@/api/queries'


export default {
  state: {
    nodes: {},
    history: [],
    optionsVisible: true,
    // IDS
    ids: {
      // depart: undefined,
      // kit: undefined,
      // creation: undefined
    }
  },

  mutations: {
    'SET_ALL_NODES_IDS' (state, [variant, nodes]) {
      Vue.set(state.ids, variant, nodes.map(({ id }) => id))
    },

    'ADD_NODES' (state, [nodes, dataLevel]) {
      function addNode (node, level) {
        const stateNode = node.id in state.nodes ? state.nodes[node.id] : undefined

        if (node.type === 'Creation') {
          node.variant = [{ id: 0 }]
        }

        if ('creations' in node) {
          if (node.creations) {
            if (!Array.isArray(node.children)) {
              node.children = []
            }
            node.creations.forEach(item => {
              item.variant = [{ id: 0 }]
              node.children.push(item)
            })
          }
          delete node.creations
        }

        if (node.variant === null || Array.isArray(node.variant)) {
          node.variant = node.variant !== null ? ID_VARIANTS[node.variant[0].id] : 'dark'
        }
        if (node.type) {
          node.type = node.type === 'Textref' ? 'ref' : 'prod'
        }

        for (const relation of RELATIONS) {
          if (relation in node && node[relation]) {
            node[relation] = node[relation].map(subNode => {
              if (!(subNode.id in state.nodes)) {
                addNode(subNode, -1)
              }
              return state.nodes[subNode.id]
            })
          }
          if (node[relation] === null) {
            node[relation] = []
          }
        }

        if (node.notes) {
          node.notes.forEach(note => {
            if (note.links && note.links.length) {
              note.links = note.links.map(link => {
                if (!(link.id in state.nodes) || state.nodes[link.id].dataLevel < 1) {
                  addNode(link, -1)
                }
                return state.nodes[link.id]
              })
            }
          })
        }

        if (!stateNode || stateNode.dataLevel < level) {
          node.dataLevel = level
        }
        if (stateNode === undefined) {
          Vue.set(state.nodes, node.id, node)
        } else {
          for (const key in node) {
            Vue.set(state.nodes[node.id], key, node[key])
          }
        }
      }

      for (const node of nodes) {
        addNode(node, dataLevel)
      }
    },

    'ADD_HISTORY_ENTRIES' (state, ids) {
      for (const id of ids) {
        if (!state.history.includes(id)) {
          state.history.push(id)
        }
      }
    },

    'UPDATE_OPTIONS_VISIBILITY' (state, visible) {
      state.optionsVisible = visible
    }
  },

  actions: {
    async 'GET_ALL_NODES_IDS' ({ state, commit }, variant) {
      if (state.ids[variant] === undefined) {
        // FIXME UPDATE WHEN QUERY OK
        // await api.query(AllNodesOfVariant, { variantId: VARIANT_IDS[variant] }).then(data => {
        await api.query(AllNodesOfVariant, { variantId: VARIANT_IDS[variant] }).then(data => {
          commit('SET_ALL_NODES_IDS', [variant, data.nodes])
        })
      }
      return state.ids[variant]
    },

    async 'GET_NODES' ({ state, commit, getters }, { ids, dataLevel = 'partial' }) {
      const lvl = DATA_LEVELS[dataLevel]
      const nodesIdsToQuery = []
      let lowestLvl = lvl
      for (const id of ids) {
        const nodeLvl = id in state.nodes ? state.nodes[id].dataLevel : -1
        if (nodeLvl < lvl) {
          nodesIdsToQuery.push(id)
        }
        if (nodeLvl < lowestLvl) {
          lowestLvl = nodeLvl
        }
      }

      if (nodesIdsToQuery.length) {
        const levelsToQuery = Array(lvl - lowestLvl).fill(lowestLvl + 1).map((v, i) => v + i)
        await api.queryNodes(nodesIdsToQuery, levelsToQuery).then(data => {
          commit('ADD_NODES', [data.nodes, lvl])
        })
      }

      return getters.nodes(ids)
    },

    async 'GET_NODE' ({ state, commit, getters }, { id, dataLevel = 'full' }) {
      const lvl = DATA_LEVELS[dataLevel]
      const nodeLvl = id in state.nodes ? state.nodes[id].dataLevel : -1
      if (nodeLvl < lvl) {
        const levelsToQuery = Array(lvl - nodeLvl).fill(nodeLvl + 1).map((v, i) => v + i)
        await api.queryNode(id, levelsToQuery).then(data => {
          commit('ADD_NODES', [[data.node], lvl])
        })
      }

      return getters.node(id)
    }
  },

  getters: {
    allNodes: state => state.nodes,
    // Args getters
    nodes: state => ids => ids.map(id => state.nodes[id]),
    node: state => id => state.nodes[id],
    optionsVisible: state => state.optionsVisible,
    history: state => state.history.map(id => state.nodes[id])
  }
}