/**
 * Manage the shared people list used by the concept picker and people dialog.
 *
 * The controller loads and updates people through the wiki API, renders both
 * views from the same collection and exposes only the selected person names to
 * the concept editor.
 */
export class CmapPeopleDialog {
  constructor(dialog, picker, repository, tr) {
    this.dialog = dialog;
    this.picker = picker;
    this.repository = repository;
    this.tr = tr;
    this.people = [];
    this.options = picker.querySelector("#cmap-person-tag-options");
    this.managementList = dialog.querySelector("#cmap-people-list");
    this.conceptInput = picker.querySelector("#cmap-person-new-name");
    this.managementInput = dialog.querySelector("#cmap-people-new-name");

    picker.querySelector("#cmap-person-add").addEventListener("click", () => {
      this.createPerson(this.conceptInput, true)
        .catch((error) => window.alert(error.message));
    });
    this.conceptInput.addEventListener("keydown", (event) => {
      if (event.key !== "Enter") return;
      event.preventDefault();
      this.createPerson(this.conceptInput, true)
        .catch((error) => window.alert(error.message));
    });
    dialog.querySelector("#cmap-people-add").addEventListener("click", () => {
      this.createPerson(this.managementInput, false)
        .then(() => this.renderManagement())
        .catch((error) => window.alert(error.message));
    });
    this.managementInput.addEventListener("keydown", (event) => {
      if (event.key !== "Enter") return;
      event.preventDefault();
      this.createPerson(this.managementInput, false)
        .then(() => this.renderManagement())
        .catch((error) => window.alert(error.message));
    });
    this.options.addEventListener("change", () => this.renderOptions(this.selectedNames()));
    dialog.querySelector("#cmap-people-close").addEventListener("click", () => dialog.close());
  }

  async load() {
    this.people = await this.repository.all();
    return this.people;
  }

  selectedNames() {
    return Array.from(this.options.querySelectorAll("input[type='checkbox']:checked"))
      .map((input) => input.dataset.personName)
      .filter(Boolean);
  }

  showSelection(selectedNames = []) {
    this.renderOptions(selectedNames);
    this.picker.open = false;
  }

  /** Render the picker while retaining inactive or missing selected people. */
  renderOptions(selectedNames = []) {
    const selected = new Set(selectedNames.map((name) => name.toLocaleLowerCase()));
    this.options.replaceChildren();
    const visiblePeople = this.people.filter((person) =>
      person.active || selected.has(String(person.name).toLocaleLowerCase()));
    for (const person of visiblePeople) {
      this.options.append(this.personOption(person.name, person.active, selected));
    }

    const knownNames = new Set(
      this.people.map((person) => String(person.name).toLocaleLowerCase()));
    for (const selectedName of selectedNames) {
      if (!knownNames.has(String(selectedName).toLocaleLowerCase())) {
        this.options.append(this.personOption(selectedName, false, selected));
      }
    }
    if (!this.options.childElementCount) {
      const empty = document.createElement("span");
      empty.className = "muted";
      empty.textContent = this.tr("no-active-people", "No active people yet.");
      this.options.append(empty);
    }

    const summary = this.picker.querySelector("summary");
    summary.textContent = selected.size ?
      this.tr("people-selected", "{count} people selected")
        .replace("{count}", String(selected.size)) :
      this.tr("select-people", "Select people");
  }

  personOption(name, active, selected) {
    const label = document.createElement("label");
    label.className = "cmap-person-tag-option";
    const checkbox = document.createElement("input");
    checkbox.type = "checkbox";
    checkbox.dataset.personName = name;
    checkbox.checked = selected.has(String(name).toLocaleLowerCase());
    const text = document.createElement("span");
    text.textContent = active ? name : `${name} (${this.tr("inactive", "inactive")})`;
    label.append(checkbox, text);
    return label;
  }

  async createPerson(input, selectInConceptDialog) {
    const name = input.value.trim();
    if (!name) {
      input.focus();
      return null;
    }
    const selected = selectInConceptDialog ? this.selectedNames() : [];
    const person = await this.repository.create(name);
    input.value = "";
    await this.load();
    if (selectInConceptDialog) this.renderOptions([...selected, person.name]);
    return person;
  }

  renderManagement() {
    this.managementList.replaceChildren();
    for (const person of this.people) {
      const row = document.createElement("div");
      row.className = "cmap-person-admin-row";
      const name = document.createElement("strong");
      name.textContent = person.name;
      const activeLabel = document.createElement("label");
      const active = document.createElement("input");
      active.type = "checkbox";
      active.checked = Boolean(person.active);
      const activeText = document.createElement("span");
      activeText.textContent = this.tr("active", "Active");
      activeLabel.append(active, activeText);
      const save = document.createElement("button");
      save.type = "button";
      save.textContent = this.tr("save", "Save");
      save.addEventListener("click", async () => {
        save.disabled = true;
        try {
          await this.repository.update(person, active.checked);
          await this.load();
          this.renderManagement();
        } catch (error) {
          window.alert(error.message);
          save.disabled = false;
        }
      });
      row.append(name, activeLabel, save);
      this.managementList.append(row);
    }
  }

  async open() {
    await this.load();
    this.renderManagement();
    this.dialog.showModal();
  }
}