import { createWidget } from "discourse/widgets/widget";
import { h } from "virtual-dom";
import { iconNode } from "discourse-common/lib/icon-library";
import RawHtml from "discourse/widgets/raw-html";
import { ajax } from "discourse/lib/ajax";
import { popupAjaxError } from "discourse/lib/ajax-error";
import evenRound from "discourse/plugins/poll/lib/even-round";
import { avatarFor } from "discourse/widgets/post";
import round from "discourse/lib/round";
import { relativeAge } from "discourse/lib/formatter";

function optionHtml(option) {
  return new RawHtml({ html: `<span>${option.html}</span>` });
}

function fetchVoters(payload) {
  return ajax("/polls/voters.json", {
    type: "get",
    data: payload
  }).catch(error => {
    if (error) {
      popupAjaxError(error);
    } else {
      bootbox.alert(I18n.t("poll.error_while_fetching_voters"));
    }
  });
}

createWidget("discourse-poll-option", {
  tagName: "li",

  buildAttributes(attrs) {
    return { "data-poll-option-id": attrs.option.id };
  },

  html(attrs) {
    const result = [];
    const { option, vote } = attrs;
    const chosen = vote.indexOf(option.id) !== -1;

    if (attrs.isMultiple) {
      result.push(iconNode(chosen ? "check-square-o" : "square-o"));
    } else {
      result.push(iconNode(chosen ? "dot-circle-o" : "circle-o"));
    }
    result.push(" ");
    result.push(optionHtml(option));

    return result;
  },

  click(e) {
    if ($(e.target).closest("a").length === 0) {
      this.sendWidgetAction("toggleOption", this.attrs.option);
    }
  }
});

createWidget("discourse-poll-load-more", {
  tagName: "div.poll-voters-toggle-expand",
  buildKey: attrs => `${attrs.id}-load-more`,

  defaultState() {
    return { loading: false };
  },

  html(attrs, state) {
    return state.loading
      ? h("div.spinner.small")
      : h("a", iconNode("chevron-down"));
  },

  click() {
    const { state } = this;
    if (state.loading) {
      return;
    }

    state.loading = true;
    return this.sendWidgetAction("loadMore").finally(
      () => (state.loading = false)
    );
  }
});

createWidget("discourse-poll-voters", {
  tagName: "ul.poll-voters-list",
  buildKey: attrs => attrs.id(),

  defaultState() {
    return {
      loaded: "new",
      pollVoters: [],
      offset: 1
    };
  },

  fetchVoters() {
    const { attrs, state } = this;
    if (state.loaded === "loading") {
      return;
    }

    state.loaded = "loading";

    return fetchVoters({
      post_id: attrs.postId,
      poll_name: attrs.pollName,
      option_id: attrs.optionId,
      offset: state.offset
    }).then(result => {
      state.loaded = "loaded";
      state.offset += 1;

      const pollResult = result[attrs.pollName];
      const newVoters =
        attrs.pollType === "number" ? pollResult : pollResult[attrs.optionId];
      state.pollVoters = state.pollVoters.concat(newVoters);

      this.scheduleRerender();
    });
  },

  loadMore() {
    return this.fetchVoters();
  },

  html(attrs, state) {
    if (attrs.pollVoters && state.loaded === "new") {
      state.pollVoters = attrs.pollVoters;
    }

    const contents = state.pollVoters.map(user => {
      return h("li", [
        avatarFor("tiny", {
          username: user.username,
          template: user.avatar_template
        }),
        " "
      ]);
    });

    if (state.pollVoters.length < attrs.totalVotes) {
      contents.push(
        this.attach("discourse-poll-load-more", { id: attrs.id() })
      );
    }

    return h("div.poll-voters", contents);
  }
});

createWidget("discourse-poll-standard-results", {
  tagName: "ul.results",
  buildKey: attrs => `${attrs.id}-standard-results`,

  defaultState() {
    return {
      loaded: "new"
    };
  },

  fetchVoters() {
    const { attrs, state } = this;

    if (state.loaded === "new") {
      fetchVoters({
        post_id: attrs.post.id,
        poll_name: attrs.poll.get("name")
      }).then(result => {
        state.voters = result[attrs.poll.get("name")];
        state.loaded = "loaded";
        this.scheduleRerender();
      });
    }
  },

  html(attrs, state) {
    const { poll } = attrs;
    const options = poll.get("options");

    if (options) {
      const voters = poll.get("voters");
      const isPublic = poll.get("public");

      const ordered = _.clone(options).sort((a, b) => {
        if (a.votes < b.votes) {
          return 1;
        } else if (a.votes === b.votes) {
          if (a.html < b.html) {
            return -1;
          } else {
            return 1;
          }
        } else {
          return -1;
        }
      });

      const percentages =
        voters === 0
          ? Array(ordered.length).fill(0)
          : ordered.map(o => (100 * o.votes) / voters);

      const rounded = attrs.isMultiple
        ? percentages.map(Math.floor)
        : evenRound(percentages);

      if (isPublic) this.fetchVoters();

      return ordered.map((option, idx) => {
        const contents = [];
        const per = rounded[idx].toString();
        const chosen = (attrs.vote || []).includes(option.id);

        contents.push(
          h(
            "div.option",
            h("p", [h("span.percentage", `${per}%`), optionHtml(option)])
          )
        );

        contents.push(
          h(
            "div.bar-back",
            h("div.bar", { attributes: { style: `width:${per}%` } })
          )
        );

        if (isPublic) {
          contents.push(
            this.attach("discourse-poll-voters", {
              id: () => `poll-voters-${option.id}`,
              postId: attrs.post.id,
              optionId: option.id,
              pollName: poll.get("name"),
              totalVotes: option.votes,
              pollVoters: (state.voters && state.voters[option.id]) || []
            })
          );
        }

        return h("li", { className: `${chosen ? "chosen" : ""}` }, contents);
      });
    }
  }
});

createWidget("discourse-poll-number-results", {
  buildKey: attrs => `${attrs.id}-number-results`,

  defaultState() {
    return {
      loaded: "new"
    };
  },

  fetchVoters() {
    const { attrs, state } = this;

    if (state.loaded === "new") {
      fetchVoters({
        post_id: attrs.post.id,
        poll_name: attrs.poll.get("name")
      }).then(result => {
        state.voters = result[attrs.poll.get("name")];
        state.loaded = "loaded";
        this.scheduleRerender();
      });
    }
  },

  html(attrs, state) {
    const { poll } = attrs;
    const isPublic = poll.get("public");

    const totalScore = poll.get("options").reduce((total, o) => {
      return total + parseInt(o.html, 10) * parseInt(o.votes, 10);
    }, 0);

    const voters = poll.voters;
    const average = voters === 0 ? 0 : round(totalScore / voters, -2);
    const averageRating = I18n.t("poll.average_rating", { average });
    const results = [
      h(
        "div.poll-results-number-rating",
        new RawHtml({ html: `<span>${averageRating}</span>` })
      )
    ];

    if (isPublic) {
      this.fetchVoters();

      results.push(
        this.attach("discourse-poll-voters", {
          id: () => `poll-voters-${poll.get("name")}`,
          totalVotes: poll.get("voters"),
          pollVoters: state.voters || [],
          postId: attrs.post.id,
          pollName: poll.get("name"),
          pollType: poll.get("type")
        })
      );
    }

    return results;
  }
});

createWidget("discourse-poll-container", {
  tagName: "div.poll-container",
  html(attrs) {
    const { poll } = attrs;

    if (attrs.showResults || attrs.isClosed) {
      const type = poll.get("type") === "number" ? "number" : "standard";
      return this.attach(`discourse-poll-${type}-results`, attrs);
    }

    const options = poll.get("options");
    if (options) {
      return h(
        "ul",
        options.map(option => {
          return this.attach("discourse-poll-option", {
            option,
            isMultiple: attrs.isMultiple,
            vote: attrs.vote
          });
        })
      );
    }
  }
});

createWidget("discourse-poll-info", {
  tagName: "div.poll-info",

  multipleHelpText(min, max, options) {
    if (max > 0) {
      if (min === max) {
        if (min > 1) {
          return I18n.t("poll.multiple.help.x_options", { count: min });
        }
      } else if (min > 1) {
        if (max < options) {
          return I18n.t("poll.multiple.help.between_min_and_max_options", {
            min,
            max
          });
        } else {
          return I18n.t("poll.multiple.help.at_least_min_options", {
            count: min
          });
        }
      } else if (max <= options) {
        return I18n.t("poll.multiple.help.up_to_max_options", { count: max });
      }
    }
  },

  html(attrs) {
    const { poll } = attrs;
    const count = poll.get("voters");
    const result = [
      h("p", [
        h("span.info-number", count.toString()),
        h("span.info-label", I18n.t("poll.voters", { count }))
      ])
    ];

    if (attrs.isMultiple) {
      if (attrs.showResults || attrs.isClosed) {
        const totalVotes = poll.get("options").reduce((total, o) => {
          return total + parseInt(o.votes, 10);
        }, 0);

        result.push(
          h("p", [
            h("span.info-number", totalVotes.toString()),
            h(
              "span.info-label",
              I18n.t("poll.total_votes", { count: totalVotes })
            )
          ])
        );
      } else {
        const help = this.multipleHelpText(
          attrs.min,
          attrs.max,
          poll.get("options.length")
        );
        if (help) {
          result.push(
            new RawHtml({ html: `<span class="info-text">${help}</span>` })
          );
        }
      }
    }

    if (!attrs.isClosed) {
      if (!attrs.showResults && poll.get("public")) {
        result.push(h("span.info-text", I18n.t("poll.public.title")));
      }

      if (poll.close) {
        const closeDate = moment.utc(poll.close);
        if (closeDate.isValid()) {
          const title = closeDate.format("LLL");
          const timeLeft = moment().to(closeDate.local(), true);

          result.push(
            new RawHtml({
              html: `<span class="info-text" title="${title}">${I18n.t(
                "poll.automatic_close.closes_in",
                { timeLeft }
              )}</span>`
            })
          );
        }
      }
    }

    return result;
  }
});

createWidget("discourse-poll-buttons", {
  tagName: "div.poll-buttons",

  html(attrs) {
    const results = [];
    const { poll, post } = attrs;
    const topicArchived = post.get("topic.archived");
    const closed = attrs.isClosed;
    const hideResultsDisabled = closed || topicArchived;

    if (attrs.isMultiple && !hideResultsDisabled) {
      const castVotesDisabled = !attrs.canCastVotes;
      results.push(
        this.attach("button", {
          className: `btn cast-votes ${castVotesDisabled ? "" : "btn-primary"}`,
          label: "poll.cast-votes.label",
          title: "poll.cast-votes.title",
          disabled: castVotesDisabled,
          action: "castVotes"
        })
      );
      results.push(" ");
    }

    if (attrs.showResults || hideResultsDisabled) {
      results.push(
        this.attach("button", {
          className: "btn toggle-results",
          label: "poll.hide-results.label",
          title: "poll.hide-results.title",
          icon: "eye-slash",
          disabled: hideResultsDisabled,
          action: "toggleResults"
        })
      );
    } else {
      results.push(
        this.attach("button", {
          className: "btn toggle-results",
          label: "poll.show-results.label",
          title: "poll.show-results.title",
          icon: "eye",
          disabled: poll.get("voters") === 0,
          action: "toggleResults"
        })
      );
    }

    if (attrs.isAutomaticallyClosed) {
      const closeDate = moment.utc(poll.get("close"));
      const title = closeDate.format("LLL");
      const age = relativeAge(closeDate.toDate(), { addAgo: true });

      results.push(
        new RawHtml({
          html: `<span class="info-text" title="${title}">${I18n.t(
            "poll.automatic_close.age",
            { age }
          )}</span>`
        })
      );
    }

    if (
      this.currentUser &&
      (this.currentUser.get("id") === post.get("user_id") ||
        this.currentUser.get("staff")) &&
      !topicArchived
    ) {
      if (closed) {
        if (!attrs.isAutomaticallyClosed) {
          results.push(
            this.attach("button", {
              className: "btn toggle-status",
              label: "poll.open.label",
              title: "poll.open.title",
              icon: "unlock-alt",
              action: "toggleStatus"
            })
          );
        }
      } else {
        results.push(
          this.attach("button", {
            className: "btn toggle-status btn-danger",
            label: "poll.close.label",
            title: "poll.close.title",
            icon: "lock",
            action: "toggleStatus"
          })
        );
      }
    }

    return results;
  }
});

export default createWidget("discourse-poll", {
  tagName: "div.poll",
  buildKey: attrs => attrs.id,

  buildAttributes(attrs) {
    const { poll } = attrs;
    return {
      "data-poll-type": poll.get("type"),
      "data-poll-name": poll.get("name"),
      "data-poll-status": poll.get("status"),
      "data-poll-public": poll.get("public"),
      "data-poll-close": poll.get("close")
    };
  },

  defaultState(attrs) {
    const showResults = this.isClosed() || attrs.post.get("topic.archived");
    return { loading: false, showResults };
  },

  html(attrs, state) {
    const { showResults } = state;
    const newAttrs = jQuery.extend({}, attrs, {
      showResults,
      canCastVotes: this.canCastVotes(),
      isClosed: this.isClosed(),
      isAutomaticallyClosed: this.isAutomaticallyClosed(),
      min: this.min(),
      max: this.max()
    });

    return h("div", [
      this.attach("discourse-poll-container", newAttrs),
      this.attach("discourse-poll-info", newAttrs),
      this.attach("discourse-poll-buttons", newAttrs)
    ]);
  },

  min() {
    let min = parseInt(this.attrs.poll.min, 10);
    if (isNaN(min) || min < 1) {
      min = 1;
    }
    return min;
  },

  max() {
    let max = parseInt(this.attrs.poll.max, 10);
    const numOptions = this.attrs.poll.options.length;
    if (isNaN(max) || max > numOptions) {
      max = numOptions;
    }
    return max;
  },

  isAutomaticallyClosed() {
    const { poll } = this.attrs;
    return poll.get("close") && moment.utc(poll.get("close")) <= moment();
  },

  isClosed() {
    const { poll } = this.attrs;
    return poll.get("status") === "closed" || this.isAutomaticallyClosed();
  },

  canCastVotes() {
    const { state, attrs } = this;

    if (this.isClosed() || state.showResults || state.loading) {
      return false;
    }

    const selectedOptionCount = attrs.vote.length;

    if (attrs.isMultiple) {
      return (
        selectedOptionCount >= this.min() && selectedOptionCount <= this.max()
      );
    }

    return selectedOptionCount > 0;
  },

  toggleStatus() {
    const { state, attrs } = this;
    const { post, poll } = attrs;

    if (this.isAutomaticallyClosed()) {
      return;
    }

    bootbox.confirm(
      I18n.t(this.isClosed() ? "poll.open.confirm" : "poll.close.confirm"),
      I18n.t("no_value"),
      I18n.t("yes_value"),
      confirmed => {
        if (confirmed) {
          state.loading = true;
          const status = this.isClosed() ? "open" : "closed";

          ajax("/polls/toggle_status", {
            type: "PUT",
            data: {
              post_id: post.get("id"),
              poll_name: poll.get("name"),
              status
            }
          })
            .then(() => {
              poll.set("status", status);
              this.scheduleRerender();
            })
            .catch(error => {
              if (error) {
                popupAjaxError(error);
              } else {
                bootbox.alert(I18n.t("poll.error_while_toggling_status"));
              }
            })
            .finally(() => {
              state.loading = false;
            });
        }
      }
    );
  },

  toggleResults() {
    this.state.showResults = !this.state.showResults;
  },

  showLogin() {
    this.register.lookup("route:application").send("showLogin");
  },

  toggleOption(option) {
    const { attrs } = this;

    if (this.isClosed()) {
      return;
    }
    if (!this.currentUser) {
      this.showLogin();
    }

    const { vote } = attrs;

    const chosenIdx = vote.indexOf(option.id);
    if (!attrs.isMultiple) {
      vote.length = 0;
    }

    if (chosenIdx !== -1) {
      vote.splice(chosenIdx, 1);
    } else {
      vote.push(option.id);
    }

    if (!attrs.isMultiple) {
      return this.castVotes();
    }
  },

  castVotes() {
    if (!this.canCastVotes()) {
      return;
    }
    if (!this.currentUser) {
      return this.showLogin();
    }

    const { attrs, state } = this;

    state.loading = true;

    return ajax("/polls/vote", {
      type: "PUT",
      data: {
        post_id: attrs.post.id,
        poll_name: attrs.poll.name,
        options: attrs.vote
      }
    })
      .then(() => {
        state.showResults = true;
      })
      .catch(error => {
        if (error) {
          popupAjaxError(error);
        } else {
          bootbox.alert(I18n.t("poll.error_while_casting_votes"));
        }
      })
      .finally(() => {
        state.loading = false;
      });
  }
});