import I18n from "I18n";
import { debounce, scheduleOnce } from "@ember/runloop";
import Component from "@ember/component";
import { observes } from "discourse-common/utils/decorators";
import { escapeExpression } from "discourse/lib/utilities";
import Group from "discourse/models/group";
import Badge from "discourse/models/badge";
import Category from "discourse/models/category";
import { INPUT_DELAY } from "discourse-common/config/environment";

const REGEXP_BLOCKS = /(([^" \t\n\x0B\f\r]+)?(("[^"]+")?))/g;

const REGEXP_USERNAME_PREFIX = /^(user:|@)/gi;
const REGEXP_CATEGORY_PREFIX = /^(category:|#)/gi;
const REGEXP_GROUP_PREFIX = /^group:/gi;
const REGEXP_BADGE_PREFIX = /^badge:/gi;
const REGEXP_TAGS_PREFIX = /^(tags?:|#(?=[a-z0-9\-]+::tag))/gi;
const REGEXP_IN_PREFIX = /^(in|with):/gi;
const REGEXP_STATUS_PREFIX = /^status:/gi;
const REGEXP_MIN_POST_COUNT_PREFIX = /^min_post_count:/gi;
const REGEXP_POST_TIME_PREFIX = /^(before|after):/gi;
const REGEXP_TAGS_REPLACE = /(^(tags?:|#(?=[a-z0-9\-]+::tag))|::tag\s?$)/gi;

const REGEXP_IN_MATCH = /^(in|with):(posted|created|watching|tracking|bookmarks|first|pinned|wiki|unseen|image)/gi;
const REGEXP_SPECIAL_IN_LIKES_MATCH = /^in:likes/gi;
const REGEXP_SPECIAL_IN_TITLE_MATCH = /^in:title/gi;
const REGEXP_SPECIAL_IN_PERSONAL_MATCH = /^in:personal/gi;
const REGEXP_SPECIAL_IN_SEEN_MATCH = /^in:seen/gi;

const REGEXP_CATEGORY_SLUG = /^(\#[a-zA-Z0-9\-:]+)/gi;
const REGEXP_CATEGORY_ID = /^(category:[0-9]+)/gi;
const REGEXP_POST_TIME_WHEN = /^(before|after)/gi;

const IN_OPTIONS_MAPPING = { images: "with" };

export default Component.extend({
  classNames: ["search-advanced-options"],

  init() {
    this._super(...arguments);

    this.inOptionsForUsers = [
      { name: I18n.t("search.advanced.filters.unseen"), value: "unseen" },
      { name: I18n.t("search.advanced.filters.posted"), value: "posted" },
      { name: I18n.t("search.advanced.filters.created"), value: "created" },
      { name: I18n.t("search.advanced.filters.watching"), value: "watching" },
      { name: I18n.t("search.advanced.filters.tracking"), value: "tracking" },
      { name: I18n.t("search.advanced.filters.bookmarks"), value: "bookmarks" }
    ];

    this.inOptionsForAll = [
      { name: I18n.t("search.advanced.filters.first"), value: "first" },
      { name: I18n.t("search.advanced.filters.pinned"), value: "pinned" },
      { name: I18n.t("search.advanced.filters.wiki"), value: "wiki" },
      { name: I18n.t("search.advanced.filters.images"), value: "images" }
    ];

    this.statusOptions = [
      { name: I18n.t("search.advanced.statuses.open"), value: "open" },
      { name: I18n.t("search.advanced.statuses.closed"), value: "closed" },
      { name: I18n.t("search.advanced.statuses.public"), value: "public" },
      { name: I18n.t("search.advanced.statuses.archived"), value: "archived" },
      {
        name: I18n.t("search.advanced.statuses.noreplies"),
        value: "noreplies"
      },
      {
        name: I18n.t("search.advanced.statuses.single_user"),
        value: "single_user"
      }
    ];

    this.postTimeOptions = [
      { name: I18n.t("search.advanced.post.time.before"), value: "before" },
      { name: I18n.t("search.advanced.post.time.after"), value: "after" }
    ];

    this._init();

    scheduleOnce("afterRender", this, this._update);
  },

  @observes("searchTerm")
  _updateOptions() {
    this._update();
    debounce(this, this._update, INPUT_DELAY);
  },

  _init() {
    this.setProperties({
      searchedTerms: {
        username: "",
        category: "",
        group: [],
        badge: [],
        tags: [],
        in: "",
        special: {
          in: {
            title: false,
            likes: false,
            personal: false,
            seen: false
          },
          all_tags: false
        },
        status: "",
        min_post_count: "",
        time: {
          when: "before",
          days: ""
        }
      },
      inOptions: this.currentUser
        ? this.inOptionsForUsers.concat(this.inOptionsForAll)
        : this.inOptionsForAll
    });
  },

  _update() {
    if (!this.searchTerm) {
      this._init();
      return;
    }

    this.setSearchedTermValue("searchedTerms.username", REGEXP_USERNAME_PREFIX);
    this.setSearchedTermValueForCategory();
    this.setSearchedTermValueForGroup();
    this.setSearchedTermValueForBadge();
    this.setSearchedTermValueForTags();

    this.setSearchedTermValue(
      "searchedTerms.in",
      REGEXP_IN_PREFIX,
      REGEXP_IN_MATCH
    );

    this.setSearchedTermSpecialInValue(
      "searchedTerms.special.in.likes",
      REGEXP_SPECIAL_IN_LIKES_MATCH
    );

    this.setSearchedTermSpecialInValue(
      "searchedTerms.special.in.title",
      REGEXP_SPECIAL_IN_TITLE_MATCH
    );

    this.setSearchedTermSpecialInValue(
      "searchedTerms.special.in.personal",
      REGEXP_SPECIAL_IN_PERSONAL_MATCH
    );

    this.setSearchedTermSpecialInValue(
      "searchedTerms.special.in.seen",
      REGEXP_SPECIAL_IN_SEEN_MATCH
    );

    this.setSearchedTermValue("searchedTerms.status", REGEXP_STATUS_PREFIX);
    this.setSearchedTermValueForPostTime();

    this.setSearchedTermValue(
      "searchedTerms.min_post_count",
      REGEXP_MIN_POST_COUNT_PREFIX
    );
  },

  findSearchTerms() {
    const searchTerm = escapeExpression(this.searchTerm);
    if (!searchTerm) return [];

    const blocks = searchTerm.match(REGEXP_BLOCKS);
    if (!blocks) return [];

    let result = [];
    blocks.forEach(block => {
      if (block.length !== 0) result.push(block);
    });

    return result;
  },

  filterBlocks(regexPrefix) {
    const blocks = this.findSearchTerms();
    if (!blocks) return [];

    let result = [];
    blocks.forEach(block => {
      if (block.search(regexPrefix) !== -1) result.push(block);
    });

    return result;
  },

  setSearchedTermValue(key, replaceRegEx, matchRegEx = null) {
    matchRegEx = matchRegEx || replaceRegEx;
    const match = this.filterBlocks(matchRegEx);

    let val = this.get(key);

    if (match.length !== 0) {
      const userInput = match[0].replace(replaceRegEx, "");
      if (val !== userInput) {
        this.set(key, userInput);
      }
    } else if (val && val.length !== 0) {
      this.set(key, "");
    }
  },

  setSearchedTermSpecialInValue(key, replaceRegEx) {
    const match = this.filterBlocks(replaceRegEx);

    if (match.length !== 0) {
      if (this.get(key) !== true) {
        this.set(key, true);
      }
    } else if (this.get(key) !== false) {
      this.set(key, false);
    }
  },

  setCategory(category) {
    this.set("searchedTerms.category", category);
    this.set("category", category);
  },

  setSearchedTermValueForCategory() {
    const match = this.filterBlocks(REGEXP_CATEGORY_PREFIX);
    if (match.length !== 0) {
      const existingInput = this.get("searchedTerms.category");
      const subcategories = match[0]
        .replace(REGEXP_CATEGORY_PREFIX, "")
        .split(":");
      if (subcategories.length > 1) {
        const userInput = Category.findBySlug(
          subcategories[1],
          subcategories[0]
        );
        if (
          (!existingInput && userInput) ||
          (existingInput && userInput && existingInput.id !== userInput.id)
        )
          this.setCategory(userInput);
      } else if (isNaN(subcategories)) {
        const userInput = Category.findSingleBySlug(subcategories[0]);
        if (
          (!existingInput && userInput) ||
          (existingInput && userInput && existingInput.id !== userInput.id)
        )
          this.setCategory(userInput);
      } else {
        const userInput = Category.findById(subcategories[0]);
        if (
          (!existingInput && userInput) ||
          (existingInput && userInput && existingInput.id !== userInput.id)
        )
          this.setCategory(userInput);
      }
    } else this.set("searchedTerms.category", "");
  },

  setSearchedTermValueForGroup() {
    const match = this.filterBlocks(REGEXP_GROUP_PREFIX);
    const group = this.get("searchedTerms.group");

    if (match.length !== 0) {
      const existingInput = _.isArray(group) ? group[0] : group;
      const userInput = match[0].replace(REGEXP_GROUP_PREFIX, "");

      if (existingInput !== userInput) {
        this.set(
          "searchedTerms.group",
          userInput.length !== 0 ? [userInput] : []
        );
      }
    } else if (group.length !== 0) {
      this.set("searchedTerms.group", []);
    }
  },

  setSearchedTermValueForBadge() {
    const match = this.filterBlocks(REGEXP_BADGE_PREFIX);
    const badge = this.get("searchedTerms.badge");

    if (match.length !== 0) {
      const existingInput = _.isArray(badge) ? badge[0] : badge;
      const userInput = match[0].replace(REGEXP_BADGE_PREFIX, "");

      if (existingInput !== userInput) {
        this.set(
          "searchedTerms.badge",
          userInput.length !== 0 ? [userInput] : []
        );
      }
    } else if (badge.length !== 0) {
      this.set("searchedTerms.badge", []);
    }
  },

  setSearchedTermValueForTags() {
    if (!this.siteSettings.tagging_enabled) return;

    const match = this.filterBlocks(REGEXP_TAGS_PREFIX);
    const tags = this.get("searchedTerms.tags");
    const contain_all_tags = this.get("searchedTerms.special.all_tags");

    if (match.length !== 0) {
      const join_char = contain_all_tags ? "+" : ",";
      const existingInput = _.isArray(tags) ? tags.join(join_char) : tags;
      const userInput = match[0].replace(REGEXP_TAGS_REPLACE, "");

      if (existingInput !== userInput) {
        this.set(
          "searchedTerms.tags",
          userInput.length !== 0 ? userInput.split(join_char) : []
        );
      }
    } else if (tags.length !== 0) {
      this.set("searchedTerms.tags", []);
    }
  },

  setSearchedTermValueForPostTime() {
    const match = this.filterBlocks(REGEXP_POST_TIME_PREFIX);

    if (match.length !== 0) {
      const existingInputWhen = this.get("searchedTerms.time.when");
      const userInputWhen = match[0].match(REGEXP_POST_TIME_WHEN)[0];
      const existingInputDays = this.get("searchedTerms.time.days");
      const userInputDays = match[0].replace(REGEXP_POST_TIME_PREFIX, "");
      const properties = {};

      if (existingInputWhen !== userInputWhen) {
        properties["searchedTerms.time.when"] = userInputWhen;
      }

      if (existingInputDays !== userInputDays) {
        properties["searchedTerms.time.days"] = userInputDays;
      }

      this.setProperties(properties);
    } else {
      this.set("searchedTerms.time.days", "");
    }
  },

  @observes("searchedTerms.username")
  updateSearchTermForUsername() {
    const match = this.filterBlocks(REGEXP_USERNAME_PREFIX);
    const userFilter = this.get("searchedTerms.username");
    let searchTerm = this.searchTerm || "";

    if (userFilter && userFilter.length !== 0) {
      if (match.length !== 0) {
        searchTerm = searchTerm.replace(match[0], `@${userFilter}`);
      } else {
        searchTerm += ` @${userFilter}`;
      }

      this.set("searchTerm", searchTerm.trim());
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match[0], "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  @observes("searchedTerms.category")
  updateSearchTermForCategory() {
    const match = this.filterBlocks(REGEXP_CATEGORY_PREFIX);
    const categoryFilter = this.get("searchedTerms.category");
    let searchTerm = this.searchTerm || "";

    const slugCategoryMatches =
      match.length !== 0 ? match[0].match(REGEXP_CATEGORY_SLUG) : null;
    const idCategoryMatches =
      match.length !== 0 ? match[0].match(REGEXP_CATEGORY_ID) : null;
    if (categoryFilter) {
      const id = categoryFilter.id;
      const slug = categoryFilter.slug;
      if (categoryFilter.parentCategory) {
        const parentSlug = categoryFilter.parentCategory.slug;
        if (slugCategoryMatches)
          searchTerm = searchTerm.replace(
            slugCategoryMatches[0],
            `#${parentSlug}:${slug}`
          );
        else if (idCategoryMatches)
          searchTerm = searchTerm.replace(
            idCategoryMatches[0],
            `category:${id}`
          );
        else searchTerm += ` #${parentSlug}:${slug}`;

        this.set("searchTerm", searchTerm.trim());
      } else {
        if (slugCategoryMatches)
          searchTerm = searchTerm.replace(slugCategoryMatches[0], `#${slug}`);
        else if (idCategoryMatches)
          searchTerm = searchTerm.replace(
            idCategoryMatches[0],
            `category:${id}`
          );
        else searchTerm += ` #${slug}`;

        this.set("searchTerm", searchTerm.trim());
      }
    } else {
      if (slugCategoryMatches)
        searchTerm = searchTerm.replace(slugCategoryMatches[0], "");
      if (idCategoryMatches)
        searchTerm = searchTerm.replace(idCategoryMatches[0], "");

      this.set("searchTerm", searchTerm.trim());
    }
  },

  @observes("searchedTerms.group")
  updateSearchTermForGroup() {
    const match = this.filterBlocks(REGEXP_GROUP_PREFIX);
    const groupFilter = this.get("searchedTerms.group");
    let searchTerm = this.searchTerm || "";

    if (groupFilter && groupFilter.length !== 0) {
      if (match.length !== 0) {
        searchTerm = searchTerm.replace(match[0], ` group:${groupFilter}`);
      } else {
        searchTerm += ` group:${groupFilter}`;
      }

      this.set("searchTerm", searchTerm);
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match[0], "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  @observes("searchedTerms.badge")
  updateSearchTermForBadge() {
    const match = this.filterBlocks(REGEXP_BADGE_PREFIX);
    const badgeFilter = this.get("searchedTerms.badge");
    let searchTerm = this.searchTerm || "";

    if (badgeFilter && badgeFilter.length !== 0) {
      if (match.length !== 0) {
        searchTerm = searchTerm.replace(match[0], ` badge:${badgeFilter}`);
      } else {
        searchTerm += ` badge:${badgeFilter}`;
      }

      this.set("searchTerm", searchTerm);
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match[0], "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  @observes("searchedTerms.tags", "searchedTerms.special.all_tags")
  updateSearchTermForTags() {
    const match = this.filterBlocks(REGEXP_TAGS_PREFIX);
    const tagFilter = this.get("searchedTerms.tags");
    let searchTerm = this.searchTerm || "";
    const contain_all_tags = this.get("searchedTerms.special.all_tags");

    if (tagFilter && tagFilter.length !== 0) {
      const join_char = contain_all_tags ? "+" : ",";
      const tags = tagFilter.join(join_char);

      if (match.length !== 0) {
        searchTerm = searchTerm.replace(match[0], `tags:${tags}`);
      } else {
        searchTerm += ` tags:${tags}`;
      }

      this.set("searchTerm", searchTerm.trim());
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match[0], "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  @observes("searchedTerms.in")
  updateSearchTermForIn() {
    const match = this.filterBlocks(REGEXP_IN_MATCH);
    const inFilter = this.get("searchedTerms.in");
    let keyword = "in";
    if (inFilter in IN_OPTIONS_MAPPING) {
      keyword = IN_OPTIONS_MAPPING[inFilter];
    }
    let searchTerm = this.searchTerm || "";

    if (inFilter) {
      if (match.length !== 0) {
        searchTerm = searchTerm.replace(match[0], `${keyword}:${inFilter}`);
      } else {
        searchTerm += ` ${keyword}:${inFilter}`;
      }

      this.set("searchTerm", searchTerm.trim());
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match, "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  updateInRegex(regex, filter) {
    const match = this.filterBlocks(regex);
    const inFilter = this.get("searchedTerms.special.in." + filter);
    let searchTerm = this.searchTerm || "";

    if (inFilter) {
      if (match.length === 0) {
        searchTerm += ` in:${filter}`;
        this.set("searchTerm", searchTerm.trim());
      }
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match, "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  @observes("searchedTerms.special.in.likes")
  updateSearchTermForSpecialInLikes() {
    this.updateInRegex(REGEXP_SPECIAL_IN_LIKES_MATCH, "likes");
  },

  @observes("searchedTerms.special.in.personal")
  updateSearchTermForSpecialInPersonal() {
    this.updateInRegex(REGEXP_SPECIAL_IN_PERSONAL_MATCH, "personal");
  },

  @observes("searchedTerms.special.in.seen")
  updateSearchTermForSpecialInSeen() {
    this.updateInRegex(REGEXP_SPECIAL_IN_SEEN_MATCH, "seen");
  },

  @observes("searchedTerms.special.in.title")
  updateSearchTermForSpecialInTitle() {
    this.updateInRegex(REGEXP_SPECIAL_IN_TITLE_MATCH, "title");
  },

  @observes("searchedTerms.status")
  updateSearchTermForStatus() {
    const match = this.filterBlocks(REGEXP_STATUS_PREFIX);
    const statusFilter = this.get("searchedTerms.status");
    let searchTerm = this.searchTerm || "";

    if (statusFilter) {
      if (match.length !== 0) {
        searchTerm = searchTerm.replace(match[0], `status:${statusFilter}`);
      } else {
        searchTerm += ` status:${statusFilter}`;
      }

      this.set("searchTerm", searchTerm.trim());
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match[0], "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  updateSearchTermForPostTime() {
    const match = this.filterBlocks(REGEXP_POST_TIME_PREFIX);
    const timeDaysFilter = this.get("searchedTerms.time.days");
    let searchTerm = this.searchTerm || "";

    if (timeDaysFilter) {
      const when = this.get("searchedTerms.time.when");
      if (match.length !== 0) {
        searchTerm = searchTerm.replace(match[0], `${when}:${timeDaysFilter}`);
      } else {
        searchTerm += ` ${when}:${timeDaysFilter}`;
      }

      this.set("searchTerm", searchTerm.trim());
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match[0], "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  @observes("searchedTerms.min_post_count")
  updateSearchTermForMinPostCount() {
    const match = this.filterBlocks(REGEXP_MIN_POST_COUNT_PREFIX);
    const postsCountFilter = this.get("searchedTerms.min_post_count");
    let searchTerm = this.searchTerm || "";

    if (postsCountFilter) {
      if (match.length !== 0) {
        searchTerm = searchTerm.replace(
          match[0],
          `min_post_count:${postsCountFilter}`
        );
      } else {
        searchTerm += ` min_post_count:${postsCountFilter}`;
      }

      this.set("searchTerm", searchTerm.trim());
    } else if (match.length !== 0) {
      searchTerm = searchTerm.replace(match[0], "");
      this.set("searchTerm", searchTerm.trim());
    }
  },

  groupFinder(term) {
    return Group.findAll({ term: term, ignore_automatic: false });
  },

  badgeFinder(term) {
    return Badge.findAll({ search: term });
  },

  actions: {
    onChangeWhenTime(time) {
      if (time) {
        this.set("searchedTerms.time.when", time);
        this.updateSearchTermForPostTime();
      }
    },
    onChangeWhenDate(date) {
      if (date) {
        this.set("searchedTerms.time.days", moment(date).format("YYYY-MM-DD"));
        this.updateSearchTermForPostTime();
      }
    },

    onChangeCategory(categoryId) {
      if (categoryId) {
        this.set("searchedTerms.category", Category.findById(categoryId));
      } else {
        this.set("searchedTerms.category", null);
      }
    }
  }
});
