import React, { Component } from "react";
import PropTypes from "prop-types";

import { observable, action } from "mobx";
import { observer } from "mobx-react";

import { debounce } from "lodash";

import Autosuggest from "react-autosuggest";
import Highlight from "react-highlighter";

import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
import { faSearch } from "@fortawesome/free-solid-svg-icons/faSearch";

import { AlertStore, FormatBackendURI } from "Stores/AlertStore";
import { Settings } from "Stores/Settings";
import { FilterInputLabel } from "Components/Labels/FilterInputLabel";
import { AutosuggestTheme } from "./Constants";
import { History } from "./History";

import "./index.css";

const FilterInput = observer(
  class FilterInput extends Component {
    static propTypes = {
      alertStore: PropTypes.instanceOf(AlertStore).isRequired,
      settingsStore: PropTypes.instanceOf(Settings).isRequired
    };

    inputStore = observable(
      {
        ref: null,
        suggestions: [],
        suggestionsFetch: null,
        value: "",
        storeInputReference(ref) {
          this.ref = ref;
        }
      },
      {
        storeInputReference: action.bound
      },
      { name: "Filter input state" }
    );

    componentDidMount() {
      if (this.inputStore.ref !== null) {
        this.inputStore.ref.input.focus();
      }
    }

    onChange = action((event, { newValue, method }) => {
      // onChange here handles change for the user input in the filter bar
      // we need to update inputStore.value every time user types in something
      event.preventDefault();
      this.inputStore.value = newValue;
    });

    onSubmit = action(event => {
      event.preventDefault();
      if (this.inputStore.value !== "") {
        this.props.alertStore.filters.addFilter(this.inputStore.value);
        this.inputStore.value = "";
      }
    });

    onSuggestionsClearRequested = action(() => {
      this.inputStore.suggestions = [];
    });

    onSuggestionsFetchRequested = debounce(
      action(({ value }) => {
        if (value !== "") {
          this.inputStore.suggestionsFetch = fetch(
            FormatBackendURI(`autocomplete.json?term=${value}`),
            { credentials: "include" }
          )
            .then(
              result => result.json(),
              err => {
                return [];
              }
            )
            .then(result => result.slice(0, 20))
            .then(result => {
              this.inputStore.suggestions = result;
            })
            .catch(err => console.error(err.message));
        }
      }),
      300
    );

    onSuggestionSelected = action((event, { suggestion }) => {
      this.inputStore.value = "";
      this.props.alertStore.filters.addFilter(suggestion);
    });

    onInputClick = (inputReference, event) => {
      if (event.target.className.split(" ").includes("form-control")) {
        inputReference.input.focus();
      }
    };

    renderSuggestion = (suggestion, { query, isHighlighted }) => {
      return (
        <Highlight
          matchElement="span"
          matchClass="font-weight-bold"
          search={query}
        >
          {suggestion}
        </Highlight>
      );
    };

    renderInputComponent = inputProps => {
      const { value } = inputProps;
      return (
        <input
          className="components-filterinput-wrapper"
          placeholder=""
          size={value.length + 1}
          {...inputProps}
        />
      );
    };

    render() {
      const { alertStore, settingsStore } = this.props;

      return (
        // data-filters is there to register filters for observation in mobx
        // in order to re-render input component
        <form
          className="form-inline mw-100"
          onSubmit={this.onSubmit}
          data-filters={alertStore.filters.values.map(f => f.raw).join(" ")}
        >
          <div className="input-group w-100 mr-2">
            <div className="input-group-prepend">
              <span className="input-group-text px-2">
                <FontAwesomeIcon icon={faSearch} />
              </span>
            </div>
            <div
              className="form-control p-1 components-filterinput"
              onClick={event => {
                this.onInputClick(this.inputStore.ref, event);
              }}
            >
              {alertStore.filters.values.map(filter => (
                <FilterInputLabel
                  key={filter.raw}
                  alertStore={alertStore}
                  filter={filter}
                />
              ))}
              <Autosuggest
                ref={this.inputStore.storeInputReference}
                suggestions={this.inputStore.suggestions}
                onSuggestionsFetchRequested={this.onSuggestionsFetchRequested}
                onSuggestionsClearRequested={this.onSuggestionsClearRequested}
                onSuggestionSelected={this.onSuggestionSelected}
                shouldRenderSuggestions={value =>
                  value && value.trim().length > 1
                }
                getSuggestionValue={suggestion => suggestion}
                renderSuggestion={this.renderSuggestion}
                renderInputComponent={this.renderInputComponent}
                inputProps={{
                  value: this.inputStore.value,
                  onChange: this.onChange
                }}
                theme={AutosuggestTheme}
              />
            </div>
            <div className="input-group-append">
              <History alertStore={alertStore} settingsStore={settingsStore} />
            </div>
          </div>
        </form>
      );
    }
  }
);

export { FilterInput };
