import { A } from "@ember/array";
import Component from "@ember/component";
import { computed, set } from "@ember/object";
import { alias, equal, not, or } from "@ember/object/computed";
import { observes } from "discourse-common/utils/decorators";
import {
  connectorContent,
  defaultConnector,
  defaultSelectionType,
  inputTypesContent,
  newPair,
} from "../lib/wizard-mapper";

export default Component.extend({
  classNameBindings: [":mapper-input", "inputType"],
  inputType: alias("input.type"),
  isConditional: equal("inputType", "conditional"),
  isAssignment: equal("inputType", "assignment"),
  isAssociation: equal("inputType", "association"),
  isValidation: equal("inputType", "validation"),
  hasOutput: or("isConditional", "isAssignment"),
  hasPairs: or("isConditional", "isAssociation", "isValidation"),
  canAddPair: not("isAssignment"),
  connectors: computed(function () {
    return connectorContent("output", this.input.type, this.options);
  }),
  inputTypes: computed(function () {
    return inputTypesContent(this.options);
  }),

  @observes("input.type")
  setupType() {
    if (this.hasPairs && (!this.input.pairs || this.input.pairs.length < 1)) {
      this.send("addPair");
    }

    if (this.hasOutput) {
      this.set("input.output", null);

      if (!this.input.outputConnector) {
        const options = this.options;
        this.set("input.output_type", defaultSelectionType("output", options));
        this.set(
          "input.output_connector",
          defaultConnector("output", this.inputType, options)
        );
      }
    }
  },

  actions: {
    addPair() {
      if (!this.input.pairs) {
        this.set("input.pairs", A());
      }

      const pairs = this.input.pairs;
      const pairCount = pairs.length + 1;

      pairs.forEach((p) => set(p, "pairCount", pairCount));

      pairs.pushObject(
        newPair(
          this.input.type,
          Object.assign({}, this.options, { index: pairs.length, pairCount })
        )
      );
    },

    removePair(pair) {
      const pairs = this.input.pairs;
      const pairCount = pairs.length - 1;

      pairs.forEach((p) => set(p, "pairCount", pairCount));
      pairs.removeObject(pair);
    },
  },
});