import type { MarketExportScope, MarketExportTarget } from "./types";

export interface PluginToolbarHandlers {
  onApplyFilter(): Promise<void> | void;
  onApplySort(): Promise<void> | void;
  onExport(): Promise<void> | void;
}

export interface PluginToolbarDom {
  exportButton: HTMLButtonElement;
  exportCustomPagesInput: HTMLInputElement;
  exportRangeSelect: HTMLSelectElement;
  exportStatusText: HTMLElement;
  filterApplyButton: HTMLButtonElement;
  personalFilterInput: HTMLInputElement;
  root: HTMLElement;
  singleFilterInput: HTMLInputElement;
  sortApplyButton: HTMLButtonElement;
  sortDirectionSelect: HTMLSelectElement;
  sortFieldSelect: HTMLSelectElement;
}

export function ensurePluginToolbar(
  document: Document,
  handlers: PluginToolbarHandlers
): PluginToolbarDom {
  const existingRoot = document.querySelector(
    "[data-plugin-toolbar='root']"
  ) as HTMLElement | null;
  if (existingRoot) {
    return readToolbarDom(existingRoot);
  }

  const root = document.createElement("section");
  root.dataset.pluginToolbar = "root";

  const singleFilterInput = document.createElement("input");
  singleFilterInput.type = "number";
  singleFilterInput.step = "0.01";
  singleFilterInput.dataset.pluginFilterSingle = "input";

  const personalFilterInput = document.createElement("input");
  personalFilterInput.type = "number";
  personalFilterInput.step = "0.01";
  personalFilterInput.dataset.pluginFilterPersonal = "input";

  const filterApplyButton = document.createElement("button");
  filterApplyButton.type = "button";
  filterApplyButton.dataset.pluginFilterApply = "button";
  filterApplyButton.textContent = "应用筛选";

  const sortFieldSelect = document.createElement("select");
  sortFieldSelect.dataset.pluginSortField = "select";
  appendOption(sortFieldSelect, "", "不排序");
  appendOption(sortFieldSelect, "singleVideoAfterSearchRate", "单视频看后搜率");
  appendOption(sortFieldSelect, "personalVideoAfterSearchRate", "个人视频看后搜率");

  const sortDirectionSelect = document.createElement("select");
  sortDirectionSelect.dataset.pluginSortDirection = "select";
  appendOption(sortDirectionSelect, "desc", "降序");
  appendOption(sortDirectionSelect, "asc", "升序");

  const sortApplyButton = document.createElement("button");
  sortApplyButton.type = "button";
  sortApplyButton.dataset.pluginSortApply = "button";
  sortApplyButton.textContent = "应用排序";

  const exportButton = document.createElement("button");
  exportButton.type = "button";
  exportButton.dataset.pluginExport = "button";
  exportButton.textContent = "导出CSV";

  const exportRangeSelect = document.createElement("select");
  exportRangeSelect.dataset.pluginExportRange = "select";
  appendOption(exportRangeSelect, "current", "当前页");
  appendOption(exportRangeSelect, "first-5", "前5页");
  appendOption(exportRangeSelect, "first-10", "前10页");
  appendOption(exportRangeSelect, "all", "全部");
  appendOption(exportRangeSelect, "custom", "自定义");
  exportRangeSelect.value = "first-5";

  const exportCustomPagesInput = document.createElement("input");
  exportCustomPagesInput.type = "number";
  exportCustomPagesInput.min = "1";
  exportCustomPagesInput.step = "1";
  exportCustomPagesInput.hidden = true;
  exportCustomPagesInput.dataset.pluginExportCustomPages = "input";

  const exportStatusText = document.createElement("span");
  exportStatusText.dataset.pluginExportStatus = "text";

  root.append(
    singleFilterInput,
    personalFilterInput,
    filterApplyButton,
    sortFieldSelect,
    sortDirectionSelect,
    sortApplyButton,
    exportRangeSelect,
    exportCustomPagesInput,
    exportButton
  );
  root.append(exportStatusText);
  document.body.prepend(root);

  filterApplyButton.addEventListener("click", () => {
    void handlers.onApplyFilter();
  });
  sortApplyButton.addEventListener("click", () => {
    void handlers.onApplySort();
  });
  exportButton.addEventListener("click", () => {
    void handlers.onExport();
  });
  exportRangeSelect.addEventListener("change", () => {
    syncCustomPagesInputVisibility({
      exportButton,
      exportCustomPagesInput,
      exportRangeSelect,
      exportStatusText,
      filterApplyButton,
      personalFilterInput,
      root,
      singleFilterInput,
      sortApplyButton,
      sortDirectionSelect,
      sortFieldSelect
    });
  });

  const toolbarDom = {
    exportButton,
    exportCustomPagesInput,
    exportRangeSelect,
    exportStatusText,
    filterApplyButton,
    personalFilterInput,
    root,
    singleFilterInput,
    sortApplyButton,
    sortDirectionSelect,
    sortFieldSelect
  } satisfies PluginToolbarDom;
  syncCustomPagesInputVisibility(toolbarDom);

  return toolbarDom;
}

function appendOption(
  select: HTMLSelectElement,
  value: string,
  label: string
): void {
  const option = select.ownerDocument.createElement("option");
  option.value = value;
  option.textContent = label;
  select.appendChild(option);
}

function readToolbarDom(root: HTMLElement): PluginToolbarDom {
  const toolbarDom = {
    exportButton: root.querySelector(
      '[data-plugin-export="button"]'
    ) as HTMLButtonElement,
    exportCustomPagesInput: root.querySelector(
      '[data-plugin-export-custom-pages="input"]'
    ) as HTMLInputElement,
    exportRangeSelect: root.querySelector(
      '[data-plugin-export-range="select"]'
    ) as HTMLSelectElement,
    exportStatusText: root.querySelector(
      '[data-plugin-export-status="text"]'
    ) as HTMLElement,
    filterApplyButton: root.querySelector(
      '[data-plugin-filter-apply="button"]'
    ) as HTMLButtonElement,
    personalFilterInput: root.querySelector(
      '[data-plugin-filter-personal="input"]'
    ) as HTMLInputElement,
    root,
    singleFilterInput: root.querySelector(
      '[data-plugin-filter-single="input"]'
    ) as HTMLInputElement,
    sortApplyButton: root.querySelector(
      '[data-plugin-sort-apply="button"]'
    ) as HTMLButtonElement,
    sortDirectionSelect: root.querySelector(
      '[data-plugin-sort-direction="select"]'
    ) as HTMLSelectElement,
    sortFieldSelect: root.querySelector(
      '[data-plugin-sort-field="select"]'
    ) as HTMLSelectElement
  } satisfies PluginToolbarDom;
  syncCustomPagesInputVisibility(toolbarDom);
  return toolbarDom;
}

export function readToolbarExportTarget(
  toolbar: PluginToolbarDom
): { error?: string; target?: MarketExportTarget } {
  const scope = toolbar.exportRangeSelect.value as MarketExportScope;

  if (scope === "all") {
    return {
      target: {
        mode: "all"
      }
    };
  }

  if (scope === "current") {
    return {
      target: {
        mode: "count",
        pageCount: 1
      }
    };
  }

  if (scope === "first-5") {
    return {
      target: {
        mode: "count",
        pageCount: 5
      }
    };
  }

  if (scope === "first-10") {
    return {
      target: {
        mode: "count",
        pageCount: 10
      }
    };
  }

  const pageCount = Number(toolbar.exportCustomPagesInput.value);
  if (!Number.isInteger(pageCount) || pageCount < 1) {
    return {
      error: "请输入有效页数"
    };
  }

  return {
    target: {
      mode: "count",
      pageCount
    }
  };
}

export function setToolbarBusyState(
  toolbar: PluginToolbarDom,
  isBusy: boolean
): void {
  [
    toolbar.exportButton,
    toolbar.filterApplyButton,
    toolbar.sortApplyButton,
    toolbar.singleFilterInput,
    toolbar.personalFilterInput,
    toolbar.sortFieldSelect,
    toolbar.sortDirectionSelect,
    toolbar.exportRangeSelect,
    toolbar.exportCustomPagesInput
  ].forEach((element) => {
    element.disabled = isBusy;
  });
}

export function setToolbarExportStatus(
  toolbar: PluginToolbarDom,
  text: string
): void {
  toolbar.exportStatusText.textContent = text;
}

function syncCustomPagesInputVisibility(toolbar: PluginToolbarDom): void {
  toolbar.exportCustomPagesInput.hidden =
    toolbar.exportRangeSelect.value !== "custom";
}