import { readdir, readFile } from 'fs'
import path from 'path'
import Papa from 'papaparse'

var today = new Date()
var monthAgo = new Date()
monthAgo.setMonth(monthAgo.getMonth() - 1)

export default {
  namespaced: true,
  state: {
    csv_files: [],
    rows: {
      data: [],
      meta: {
        fields: []
      }
    },
    start: monthAgo.toISOString().split('T')[0],
    end: today.toISOString().split('T')[0]
  },
  getters: {
    csvs: (state) => {
      return state.csv_files
    },
    rows: (state) => {
      return state.rows.data
    },
    spending_rows: (state, getters) => {
      return getters.rows.filter(x => x.Montant < 0)
    },
    start: (state) => {
      return state.start
    },
    end: (state) => {
      return state.end
    },
    date_filter_rows: (state, getters) => {
      var start = new Date(state.start)
      var end = new Date(state.end)
      return getters.spending_rows.filter(x => {
        return (new Date(x.Date) >= start) & (new Date(x.Date) < end)
      })
    },
    libelle_filter_rows: (state, getters) => (words, invert) => {
      if (!words) {
        return getters.date_filter_rows
      }
      if (invert) {
        return getters.date_filter_rows.filter(x => {
          return words.every(v => {
            return x.Libellé.indexOf(v) < 0
          })
        })
      } else {
        return getters.date_filter_rows.filter(x => {
          return words.some(v => {
            return x.Libellé.indexOf(v) >= 0
          })
        })
      }
    }
  },
  mutations: {
    SET_CSV_FILES: (state, { csvs }) => {
      state.csv_files = csvs
    },
    SET_DATA: (state, { data }) => {
      data.data = data.data.filter(x => x.Libellé !== undefined)
      state.rows = data
    },
    APPEND_DATA: (state, { content }) => {
      state.rows.push(content)
    },
    SET_START: (state, { start }) => {
      state.start = start
    },
    SET_END: (state, { end }) => {
      state.end = end
    }
  },
  actions: {
    find_csv (context) {
      try {
        readdir(context.rootGetters['config/data_dir'], (err, list) => {
          if (err) {
            console.log(err)
          } else {
            var csvs = list.filter(x => {
              return x.split('.').pop() === 'csv'
            })
            for (var i in csvs) {
              context.dispatch('load_csv', csvs[i])
            }
            context.commit('SET_CSV_FILES', { csvs })
          }
        })
      } catch (e) {
        console.log(e)
      }
    },
    load_csv (context, csv) {
      readFile(path.join(context.rootGetters['config/data_dir'], csv), 'utf8', (err, content) => {
        if (err) {
          console.log(err)
        } else {
          var parseConfig = {
            header: true
          }
          var parsed = Papa.parse(content, parseConfig)
          context.commit('SET_DATA', { data: parsed })
        }
      })
    },
    set_start (context, start) {
      context.commit('SET_START', { start })
    },
    set_end (context, end) {
      context.commit('SET_END', { end })
    }
  }
}