function advancedSearch() {
  return {
    gopen: false,
    bopen: false,
    dopen: false,
    copen: false,
    loading: false,
    submitDisabled: true,
    g: {},
    b: {},
    d: {},
    c: {},
    tagName(type, id) {
      if (type === 'b') {
        return this.b.find(i => i.id == id).label;
      } else if (type === 'c') {
        return this.c.find(i => i.id == id).code;
      } else if (type === 'g') {
        try {
          return this.g.find(i => i.id == id).label;
        } catch(err) {
          return;
        }
      } else if (type === 'd') {
        try {
          return this.d.find(i => i.id == id).code;
        } catch (err) {
          return;
        }
      }
    },
    gid: null,
    bid: [],
    did: null,
    cid: [],
    date: {},
    search() {
        generateRequest(this.did, this.cid, this.date.from, this.date.to, this.bid);
    },
    // Triggers when an entry is selected from any of the dropdowns
    selectEntry(element, entry) {
        const selType = element.id.split('-')[1];
        console.debug(selType);
        if (selType === 'group') {
            element.parentElement.querySelectorAll('a').forEach(el => el.classList.remove('is-active'));
            element.classList.add('is-active');
            // update variables;
            this.bid = [];
            this.gid = entry;
            this.gopen = false;
        } else if (selType === 'body') {
            // toggle
            element.classList.toggle('is-active');
            // update variables;
            this.bid.indexOf(entry) === -1 ? this.bid.push(entry) : this.bid = this.bid.filter(function(id) { return id !== entry});
            this.bopen = false;
            // add tag
        } else if (selType === 'desc') {
            // highlight
            element.parentElement.querySelectorAll('a').forEach(el => el.classList.remove('is-active'));
            element.classList.add('is-active');
            // update variables;
            this.cid = [];
            this.did = entry;
          console.debug(this.did);
            this.dopen = false;
        } else if (selType === 'crit') {
            // toggle
            element.classList.toggle('is-active');
            // update variables;
            this.cid.indexOf(entry) === -1 ? this.cid.push(entry) : this.cid = this.cid.filter(function(id) { return id !== entry});
            this.copen = false;
            // add tag
        }
      this.submitDisabled = !(this.bid.length > 0 && this.cid.length > 0);
    },
    getDropdownData(dropdown) {
        this.loading = true;
        let url = BASE_URL;
        switch(dropdown) {
            case 'g':
                url += '/interface/dropdowns/watergroups';
            break;
            case 'b':
                url += '/interface/dropdowns/waterbodies?group_id=' + this.gid;
            break;
            case 'd':
                url += '/interface/dropdowns/descriptors?body_id=' + this.bid;
            break;
            case 'c':
                url += '/interface/dropdowns/criterias?desc_id=' + this.did;
            break;
        }
        fetch(url)
            .then(res => res.json())
            .then(data => {
                this.isLoading = false;
                eval('this.' + dropdown + '=data');
                console.debug(data);
            });
    },
    loadCal() {
      const calendars = bulmaCalendar.attach('[type=date]', {dateFormat: 'dd/MM/yyyy', isRange: true,
      minDate: '01/01/1990'});
      // Loop on each calendar initialized
      calendars.forEach(calendar => {
          calendar.on('save', data => {
              this.date = {
                  from: calendar.startDate.toLocaleDateString(),
                  to: calendar.endDate.toLocaleDateString()
              }
          });
      });
    }
  };
}

function makeRequestsGrid() {
     window.requestsGrid = new gridjs.Grid({
      columns: ['UUID', 'Criterias',
        {
          name: 'Requested At',
        },
        {
          name: 'Status',
        },
        {
        name: 'Actions',
        formatter: (cell, row) => {
          if (cell == 'f') {
            return "";
          }
          return gridjs.h('button', {
            className: 'py-2 mb-4 px-4 border rounded-md text-white bg-blue-600',
            onClick: () => downloadOneFile(row.cells[0].data)
          }, 'Download');
        }
      }],
      search: false,
      server: {
          url: BASE_URL + '/actions/requests/',
          then: data => data.map(reqs => [reqs.uuid, reqs.criterias, reqs.requested_at, reqs.status, reqs.downloadable])
      }
    }).render(document.getElementById('grid-requests'));

    setInterval(function() {
      requestsGrid.forceRender();
    }, 20000);
}


function refreshRequestGrid() {
  requestsGrid.forceRender();
}


function downloadOneFile(fileUUID) {
  const url = BASE_URL + '/actions/data/download?uuid=' + fileUUID;
  fetch(url,{
    "credentials": "include",
    "headers": {
        "Accept": "application/zip",
        "Accept-Language": "en-US,en;q=0.5",
        "Sec-Fetch-Dest": "empty",
        "Sec-Fetch-Mode": "cors",
        "Pragma": "no-cache",
        "Cache-Control": "no-cache"
    },
    "method": "GET",
    "mode": "cors"}
  )
  .then(res => { return res.blob(); })
  .then(data => {
    var a = document.createElement("a");
    a.href = window.URL.createObjectURL(data);
    a.download = fileUUID;
    a.click();
  });
}



/**
* Submit a request to the server and returns the entry inserted
* @param {number} desc
* @param {number} crit
* @return {json}
*/
function generateRequest(desc, crit, from, to, bodyId=null) {
  console.debug('requesting data');
  const url = BASE_URL + `/actions/data/search?bodyId=${bodyId}&dateFrom=${from}&dateTo=${to}&critId=${crit}`;
  fetch(url)
    .then(res => {
      return res.json();
    }).then(data => {
      db.requests.add({
        uuid: data.uuid,
        parameters: data.parameters,
        status: data.status
      }).then(d => {
        alert('Request complete. Check the request tab');
        requestsGrid.forceRender();
      });
    });
 }


/**
 * Function to request data for a specific entity such as station or cruise
 * @param {number} desc - The descriptor id
 * @param {number} crit - The criteria id
 * @param {string} from - The start date for which the data is to be requested
 * @param {string} to - The end date for which the data is to be requested
 * @param {string} entityGroup - The entity group (e.g. cruise station, argo, wfd station)
 * @param {string} entityId - The entity feature id (e.g. station id)
 * @return {null}
 */
function requestEntityData(desc, crit, from, to, entityGroup, entityId) {
  const url = BASE_URL + `/actions/data/search?entityGroup=${entityGroup}&entityId=${entityId}&dateFrom=${from}&dateTo=${to}&critId=${crit}`;
  fetch(url)
    .then(res => {
      return res.json();
    }).then(data => {
      db.requests.add({
        uuid: data.uuid,
        parameters: data.parameters,
        status: data.status
      }).then(d => {
        alert('Request complete. Check the request tab');
        requestsGrid.forceRender();
      });
    });
 }



/**
 * Function to request data for a specific entity that has an external source
 * @param {number} desc - The descriptor id
 * @param {number} crit - The criteria id
 * @param {string} from - The start date for which the data is to be requested
 * @param {string} to - The end date for which the data is to be requested
 * @param {string} entityGroup - The entity group (e.g. cruise station, argo, wfd station)
 * @param {string} entityId - The entity feature id (e.g. station id)
 * @return {null}
 */
function requestExternalData(desc, crit, from, to, entityGroup, entityId) {
  console.debug('requesting external data');
  const url = BASE_URL + `/src/data/request_external_data.php?entityGroup=${entityGroup}&entityId=${entityId}&dateFrom=${from}&dateTo=${to}&critId=${crit}`;
  fetch(url)
    .then(res => {
      return res.blob();
    }).then(data => {
        const url = window.URL.createObjectURL(data);
        const a = document.createElement('a');
        a.href = url;
        a.download = `external_data-${entityId}.json`;
        a.click();
      });
 }


function clearRequests() {
  let url = BASE_URL + `/actions/requests/`;
  if (confirm('Clear requests list?')) {
    fetch(url, {
      method: 'DELETE'
    })
    .then(response => {
      if (response.ok)
        requestsGrid.forceRender();
    });
  } else {
    console.log('Cancel');
  }
}


function moreInfo() {
  return {
    entityGroup: selectedEntityGroup,
    entityId: selectedEntityId || Alpine.store('entity').id,
    dopen: false,
    copen: false,
    loading: false,
    isGrid: Alpine.store('entity').hasOwnProperty('cellcode'),
    d: {},
    c: {},
    tagName(type, id) {
      if (id == null)
        return;
      if (type === 'd') {
        return this.d.find(i => i.id == id).code;
      } else if (type === 'c') {
        return this.c.find(i => i.id == id).code;
      }
    },
    did: null,
    cid: [],
    date: {},
    search() {
      this.drawDataChart();
      // check if entity has an external source
      if (this.$store.entity.hasOwnProperty('ctStationCode')) {
        requestExternalData(this.did, this.cid, this.date.from, this.date.to, this.entityGroup, this.entityId);
      } else {
        requestEntityData(this.did, this.cid, this.date.from, this.date.to, this.entityGroup, this.entityId);
      }
    },
    selectEntry(element, entry) {
      console.debug(element.text.substr(0, element.text.indexOf(' ')));
      if (element.id.split('-')[1] === 'desc') {
        // highlight
        element.parentElement.querySelectorAll('a').forEach(el => el.classList.remove('is-active'));
        element.classList.add('is-active');
        // update variables;
        this.cid = [];
        this.did = entry;
        this.dopen = false;
      } else if (element.id.split('-')[1] === 'crit') {
        // toggle
        element.classList.toggle('is-active');
        // update variables;
        this.cid.indexOf(entry) === -1 ? this.cid.push(entry) : this.cid = this.cid.filter(function(id) { return id !== entry});
        this.copen = false;
        // add tag
      }
    },
    getDropdownData(dropdown) {
      this.loading = true;
      let url = BASE_URL;
      let gridCode;
      if (this.isGrid) {
        gridCode = Alpine.store('entity').cellcode.substr(0,4);
      }

      switch(dropdown) {
        case 'd':
            url += '/interface/descriptor_dropdown.php?entityid=' + this.entityId + '&cellcode=' + gridCode;
        break;
        case 'c':
            url += '/interface/criteria_dropdown.php?descriptor_id=' + this.did + '&cellcode=' + gridCode;
        break;
      }

      fetch(url)
        .then(res => res.json())
        .then(data => {
          this.isLoading = false;
          eval('this.' + dropdown + '=data');
        });
    },
    loadCal() {
      const calendars = bulmaCalendar.attach('[type=date]', {dateFormat: 'dd/MM/yyyy', isRange: true});
      // Loop on each calendar initialized
      calendars.forEach(calendar => {
        calendar.on('save', data => {
          this.date = {
              from: calendar.startDate.toLocaleDateString(),
              to: calendar.endDate.toLocaleDateString()
          }
        });
      });
    },
    populateFeatureGrid(grid) {
      const features = Alpine.store('entity');
      console.debug(features);
      const featureCols = Object.getOwnPropertyNames(Alpine.store('entity')).filter(name => aliasMap.has(name));
      const featureVals = featureCols.map(col => {return {feature: aliasMap.get(col), value: features[col]}});
      console.debug(featureVals);
      new gridjs.Grid({
        data: featureVals
      }).render(grid);
    },
    drawDataChart() {
      if (this.entityGroup != 'POSEIDON')
        return;
      const url = `/data/external/POSEIDON/${Alpine.store('entity').tspr}_${Alpine.store('entity').type}_${Alpine.store('entity').pid}`;
      fetch(url)
        .then(res => res.json())
        .then(data => {
          this.isLoading = false;
          console.debug(data);
        });

      const config = {
        type: 'line',
        data: data,
        options: {
          responsive: true,
          plugins: {
            legend: {
              position: 'top',
            },
            title: {
              display: true,
              text: 'Chart.js Line Chart'
            }
          }
        },
      };
    }
  };
}


function mruInfo() {
  return {
    dopen: false,
    copen: false,
    loading: false,
    d: {},
    c: {},
    tagName(type, id) {
      if (id == null)
        return;
      if (type === 'd') {
        return this.d.find(i => i.id == id).code;
      } else if (type === 'c') {
        return this.c.find(i => i.id == id).code;
      }
    },
    bid: Alpine.store('mru').objectid,
    did: null,
    cid: [],
    date: {},
    search() {
      generateRequest(this.did, this.cid, this.date.from, this.date.to, this.bid);
    },
    selectEntry(element, entry) {
      console.debug(element.text.substr(0, element.text.indexOf(' ')));
      if (element.id.split('-')[1] === 'desc') {
        // highlight
        element.parentElement.querySelectorAll('a').forEach(el => el.classList.remove('is-active'));
        element.classList.add('is-active');
        // update variables;
        this.cid = [];
        this.did = entry;
        this.dopen = false;
      } else if (element.id.split('-')[1] === 'crit') {
        // toggle
        element.classList.toggle('is-active');
        // update variables;
        this.cid.indexOf(entry) === -1 ? this.cid.push(entry) : this.cid = this.cid.filter(function(id) { return id !== entry});
        this.copen = false;
        // add tag
      }
    },
    getDropdownData(dropdown) {
      this.loading = true;
      let url = BASE_URL;
      switch(dropdown) {
        case 'd':
            url += '/interface/descriptor_dropdown.php?bodyid=' + this.bid;
        break;
        case 'c':
            url += '/interface/criteria_dropdown.php?descriptor_id=' + this.did;
        break;
      }
      fetch(url)
        .then(res => res.json())
        .then(data => {
          this.isLoading = false;
          eval('this.' + dropdown + '=data');
        });
    },
    loadCal() {
      const calendars = bulmaCalendar.attach('[type=date]', {dateFormat: 'dd/MM/yyyy', isRange: true});
      // Loop on each calendar initialized
      calendars.forEach(calendar => {
        calendar.on('save', data => {
          this.date = {
              from: calendar.startDate.toLocaleDateString(),
              to: calendar.endDate.toLocaleDateString()
          }
        });
      });
    },
    populateFeatureGrid(grid) {
      console.debug(grid);
      const features = Alpine.store('mru');
      const featureCols = Object.getOwnPropertyNames(Alpine.store('mru')).filter(name => aliasMap.has(name));
      const featureVals = featureCols.map(col => {return {feature: aliasMap.get(col), value: features[col]}});
      console.debug(featureVals);
      new gridjs.Grid({
        data: featureVals
      }).render(grid);
    }
  };
}