import PropTypes from "prop-types";
import { PureComponent } from "react";

import { defineMessages, injectIntl, FormattedMessage, FormattedList } from "react-intl";

import classNames from "classnames";

import ImmutablePropTypes from "react-immutable-proptypes";

import { Icon }  from "mastodon/components/icon";
import { domain, searchEnabled } from "mastodon/initial_state";
import { HASHTAG_REGEX } from "mastodon/utils/hashtags";

const messages = defineMessages({
  placeholder: { id: "search.placeholder", defaultMessage: "Search" },
  placeholderSignedIn: { id: "search.search_or_paste", defaultMessage: "Search or paste URL" },
});

const labelForRecentSearch = search => {
  switch(search.get("type")) {
    case "account":
      return `@${search.get("q")}`;
    case "hashtag":
      return `#${search.get("q")}`;
    default:
      return search.get("q");
  }
};

class Search extends PureComponent {

  static contextTypes = {
    router: PropTypes.object.isRequired,
    identity: PropTypes.object.isRequired,
  };

  static propTypes = {
    value: PropTypes.string.isRequired,
    recent: ImmutablePropTypes.orderedSet,
    submitted: PropTypes.bool,
    onChange: PropTypes.func.isRequired,
    onSubmit: PropTypes.func.isRequired,
    onOpenURL: PropTypes.func.isRequired,
    onClickSearchResult: PropTypes.func.isRequired,
    onForgetSearchResult: PropTypes.func.isRequired,
    onClear: PropTypes.func.isRequired,
    onShow: PropTypes.func.isRequired,
    openInRoute: PropTypes.bool,
    intl: PropTypes.object.isRequired,
    singleColumn: PropTypes.bool,
  };

  state = {
    expanded: false,
    selectedOption: -1,
    options: [],
  };

  defaultOptions = [
    { label: <><mark>has:</mark> <FormattedList type='disjunction' value={["media", "poll", "embed"]} /></>, action: e => {
      e.preventDefault(); this._insertText("has:"); 
    } },
    { label: <><mark>is:</mark> <FormattedList type='disjunction' value={["reply", "sensitive"]} /></>, action: e => {
      e.preventDefault(); this._insertText("is:"); 
    } },
    { label: <><mark>language:</mark> <FormattedMessage id='search_popout.language_code' defaultMessage='ISO language code' /></>, action: e => {
      e.preventDefault(); this._insertText("language:"); 
    } },
    { label: <><mark>from:</mark> <FormattedMessage id='search_popout.user' defaultMessage='user' /></>, action: e => {
      e.preventDefault(); this._insertText("from:"); 
    } },
    { label: <><mark>before:</mark> <FormattedMessage id='search_popout.specific_date' defaultMessage='specific date' /></>, action: e => {
      e.preventDefault(); this._insertText("before:"); 
    } },
    { label: <><mark>during:</mark> <FormattedMessage id='search_popout.specific_date' defaultMessage='specific date' /></>, action: e => {
      e.preventDefault(); this._insertText("during:"); 
    } },
    { label: <><mark>after:</mark> <FormattedMessage id='search_popout.specific_date' defaultMessage='specific date' /></>, action: e => {
      e.preventDefault(); this._insertText("after:"); 
    } },
    { label: <><mark>in:</mark> <FormattedList type='disjunction' value={["all", "library"]} /></>, action: e => {
      e.preventDefault(); this._insertText("in:"); 
    } },
  ];

  setRef = c => {
    this.searchForm = c;
  };

  handleChange = ({ target }) => {
    const { onChange } = this.props;

    onChange(target.value);

    this._calculateOptions(target.value);
  };

  handleClear = e => {
    const { value, submitted, onClear } = this.props;

    e.preventDefault();

    if (value.length > 0 || submitted) {
      onClear();
      this.setState({ options: [], selectedOption: -1 });
    }
  };

  handleKeyDown = (e) => {
    const { selectedOption } = this.state;
    const options = searchEnabled ? this._getOptions().concat(this.defaultOptions) : this._getOptions();

    switch(e.key) {
      case "Escape":
        e.preventDefault();
        this._unfocus();

        break;
      case "ArrowDown":
        e.preventDefault();

        if (options.length > 0) {
          this.setState({ selectedOption: Math.min(selectedOption + 1, options.length - 1) });
        }

        break;
      case "ArrowUp":
        e.preventDefault();

        if (options.length > 0) {
          this.setState({ selectedOption: Math.max(selectedOption - 1, -1) });
        }

        break;
      case "Enter":
        e.preventDefault();

        if (selectedOption === -1) {
          this._submit();
        } else if (options.length > 0) {
          options[selectedOption].action(e);
        }

        break;
      case "Delete":
        if (selectedOption > -1 && options.length > 0) {
          const search = options[selectedOption];

          if (typeof search.forget === "function") {
            e.preventDefault();
            search.forget(e);
          }
        }

        break;
    }
  };

  handleFocus = () => {
    const { onShow, singleColumn } = this.props;

    this.setState({ expanded: true, selectedOption: -1 });
    onShow();

    if (this.searchForm && !singleColumn) {
      const { left, right } = this.searchForm.getBoundingClientRect();

      if (left < 0 || right > (window.innerWidth || document.documentElement.clientWidth)) {
        this.searchForm.scrollIntoView();
      }
    }
  };

  handleBlur = () => {
    this.setState({ expanded: false, selectedOption: -1 });
  };

  handleHashtagClick = () => {
    const { router } = this.context;
    const { value, onClickSearchResult } = this.props;

    const query = value.trim().replace(/^#/, "");

    router.history.push(`/tags/${query}`);
    onClickSearchResult(query, "hashtag");
    this._unfocus();
  };

  handleAccountClick = () => {
    const { router } = this.context;
    const { value, onClickSearchResult } = this.props;

    const query = value.trim().replace(/^@/, "");

    router.history.push(`/@${query}`);
    onClickSearchResult(query, "account");
    this._unfocus();
  };

  handleURLClick = () => {
    const { router } = this.context;
    const { value, onOpenURL } = this.props;

    onOpenURL(value, router.history);
    this._unfocus();
  };

  handleStatusSearch = () => {
    this._submit("statuses");
  };

  handleAccountSearch = () => {
    this._submit("accounts");
  };

  handleRecentSearchClick = search => {
    const { onChange } = this.props;
    const { router } = this.context;

    if (search.get("type") === "account") {
      router.history.push(`/@${search.get("q")}`);
    } else if (search.get("type") === "hashtag") {
      router.history.push(`/tags/${search.get("q")}`);
    } else {
      onChange(search.get("q"));
      this._submit(search.get("type"));
    }

    this._unfocus();
  };

  handleForgetRecentSearchClick = search => {
    const { onForgetSearchResult } = this.props;

    onForgetSearchResult(search.get("q"));
  };

  _unfocus () {
    document.querySelector(".ui").parentElement.focus();
  }

  _insertText (text) {
    const { value, onChange } = this.props;

    if (value === "") {
      onChange(text);
    } else if (value[value.length - 1] === " ") {
      onChange(`${value}${text}`);
    } else {
      onChange(`${value} ${text}`);
    }
  }

  _submit (type) {
    const { onSubmit, openInRoute, value, onClickSearchResult } = this.props;
    const { router } = this.context;

    onSubmit(type);

    if (value) {
      onClickSearchResult(value, type);
    }

    if (openInRoute) {
      router.history.push("/search");
    }

    this._unfocus();
  }

  _getOptions () {
    const { options } = this.state;

    if (options.length > 0) {
      return options;
    }

    const { recent } = this.props;

    return recent.toArray().map(search => ({
      label: labelForRecentSearch(search),

      action: () => this.handleRecentSearchClick(search),

      forget: e => {
        e.stopPropagation();
        this.handleForgetRecentSearchClick(search);
      },
    }));
  }

  _calculateOptions (value) {
    const trimmedValue = value.trim();
    const options = [];

    if (trimmedValue.length > 0) {
      const couldBeURL = trimmedValue.startsWith("https://") && !trimmedValue.includes(" ");

      if (couldBeURL) {
        options.push({ key: "open-url", label: <FormattedMessage id='search.quick_action.open_url' defaultMessage='Open URL in Mastodon' />, action: this.handleURLClick });
      }

      const couldBeHashtag = (trimmedValue.startsWith("#") && trimmedValue.length > 1) || trimmedValue.match(HASHTAG_REGEX);

      if (couldBeHashtag) {
        options.push({ key: "go-to-hashtag", label: <FormattedMessage id='search.quick_action.go_to_hashtag' defaultMessage='Go to hashtag {x}' values={{ x: <mark>#{trimmedValue.replace(/^#/, "")}</mark> }} />, action: this.handleHashtagClick });
      }

      const couldBeUsername = trimmedValue.match(/^@?[a-z0-9_-]+(@[^\s]+)?$/i);

      if (couldBeUsername) {
        options.push({ key: "go-to-account", label: <FormattedMessage id='search.quick_action.go_to_account' defaultMessage='Go to profile {x}' values={{ x: <mark>@{trimmedValue.replace(/^@/, "")}</mark> }} />, action: this.handleAccountClick });
      }

      const couldBeStatusSearch = searchEnabled;

      if (couldBeStatusSearch) {
        options.push({ key: "status-search", label: <FormattedMessage id='search.quick_action.status_search' defaultMessage='Posts matching {x}' values={{ x: <mark>{trimmedValue}</mark> }} />, action: this.handleStatusSearch });
      }

      const couldBeUserSearch = true;

      if (couldBeUserSearch) {
        options.push({ key: "account-search", label: <FormattedMessage id='search.quick_action.account_search' defaultMessage='Profiles matching {x}' values={{ x: <mark>{trimmedValue}</mark> }} />, action: this.handleAccountSearch });
      }
    }

    this.setState({ options });
  }

  render () {
    const { intl, value, submitted, recent } = this.props;
    const { expanded, options, selectedOption } = this.state;
    const { signedIn } = this.context.identity;

    const hasValue = value.length > 0 || submitted;

    return (
      <div className={classNames("search", { active: expanded })}>
        <input
          ref={this.setRef}
          className='search__input'
          type='text'
          placeholder={intl.formatMessage(signedIn ? messages.placeholderSignedIn : messages.placeholder)}
          aria-label={intl.formatMessage(signedIn ? messages.placeholderSignedIn : messages.placeholder)}
          value={value}
          onChange={this.handleChange}
          onKeyDown={this.handleKeyDown}
          onFocus={this.handleFocus}
          onBlur={this.handleBlur}
        />

        <div role='button' tabIndex={0} className='search__icon' onClick={this.handleClear}>
          <Icon id='search' className={hasValue ? "" : "active"} />
          <Icon id='times-circle' className={hasValue ? "active" : ""} aria-label={intl.formatMessage(messages.placeholder)} />
        </div>

        <div className='search__popout'>
          {options.length === 0 && (
            <>
              <h4><FormattedMessage id='search_popout.recent' defaultMessage='Recent searches' /></h4>

              <div className='search__popout__menu'>
                {recent.size > 0 ? this._getOptions().map(({ label, action, forget }, i) => (
                  <button key={label} onMouseDown={action} className={classNames("search__popout__menu__item search__popout__menu__item--flex", { selected: selectedOption === i })}>
                    <span>{label}</span>
                    <button className='icon-button' onMouseDown={forget}><Icon id='times' /></button>
                  </button>
                )) : (
                  <div className='search__popout__menu__message'>
                    <FormattedMessage id='search.no_recent_searches' defaultMessage='No recent searches' />
                  </div>
                )}
              </div>
            </>
          )}

          {options.length > 0 && (
            <>
              <h4><FormattedMessage id='search_popout.quick_actions' defaultMessage='Quick actions' /></h4>

              <div className='search__popout__menu'>
                {options.map(({ key, label, action }, i) => (
                  <button key={key} onMouseDown={action} className={classNames("search__popout__menu__item", { selected: selectedOption === i })}>
                    {label}
                  </button>
                ))}
              </div>
            </>
          )}

          <h4><FormattedMessage id='search_popout.options' defaultMessage='Search options' /></h4>

          {searchEnabled ? (
            <div className='search__popout__menu'>
              {this.defaultOptions.map(({ key, label, action }, i) => (
                <button key={key} onMouseDown={action} className={classNames("search__popout__menu__item", { selected: selectedOption === ((options.length || recent.size) + i) })}>
                  {label}
                </button>
              ))}
            </div>
          ) : (
            <div className='search__popout__menu__message'>
              <FormattedMessage id='search_popout.full_text_search_disabled_message' defaultMessage='Not available on {domain}.' values={{ domain }} />
            </div>
          )}
        </div>
      </div>
    );
  }

}

export default injectIntl(Search);