import BaseView from 'app/client/components/BaseView';
import {GristDoc} from 'app/client/components/GristDoc';
import {ViewRec, ViewSectionRec} from 'app/client/models/DocModel';
import {filterBar} from 'app/client/ui/FilterBar';
import {cssIcon} from 'app/client/ui/RightPanelStyles';
import {makeCollapsedLayoutMenu} from 'app/client/ui/ViewLayoutMenu';
import {cssDotsIconWrapper, cssMenu, viewSectionMenu} from 'app/client/ui/ViewSectionMenu';
import {buildWidgetTitle} from 'app/client/ui/WidgetTitle';
import {getWidgetTypes} from 'app/client/ui/widgetTypes';
import {colors, isNarrowScreenObs, mediaSmall, testId, theme} from 'app/client/ui2018/cssVars';
import {icon} from 'app/client/ui2018/icons';
import {menu} from 'app/client/ui2018/menus';
import {Computed, dom, DomElementArg, Observable, styled} from 'grainjs';
import {defaultMenuOptions} from 'popweasel';


export function buildCollapsedSectionDom(options: {
  gristDoc: GristDoc,
  sectionRowId: number|string,
}, ...domArgs: DomElementArg[]) {
  const {gristDoc, sectionRowId} = options;
  if (typeof sectionRowId === 'string') {
    return cssMiniSection(
      dom('span.viewsection_title_font',
        'Empty'
      )
    );
  }
  const vs: ViewSectionRec = gristDoc.docModel.viewSections.getRowModel(sectionRowId);
  const typeComputed = Computed.create(null, use => getWidgetTypes(use(vs.parentKey) as any).icon);
  return cssMiniSection(
    testId(`minilayout-section-${sectionRowId}`),
    testId(`minilayout-section`),
    cssDragHandle(
      dom.domComputed(typeComputed, (type) => icon(type)),
      dom('div', {style: 'margin-right: 16px;'}),
      dom.maybe((use) => use(use(vs.table).summarySourceTable), () => cssSigmaIcon('Pivot', testId('sigma'))),
      dom('span.viewsection_title_font', testId('viewsection-title'),
        dom.text(vs.titleDef),
      ),
    ),
    cssMenu(
      testId('section-menu-viewLayout'),
      cssDotsIconWrapper(cssIcon('Dots')),
      menu(_ctl => makeCollapsedLayoutMenu(vs, gristDoc), {
        ...defaultMenuOptions,
        placement: 'bottom-end',
      })
    ),
    ...domArgs
  );
}


export function buildViewSectionDom(options: {
  gristDoc: GristDoc,
  sectionRowId: number,
  isResizing?: Observable<boolean>
  viewModel?: ViewRec,
  // Should show drag anchor.
  draggable?: boolean, /* defaults to true */
  // Should show green bar on the left (but preserves active-section class).
  focusable?: boolean, /* defaults to true */
  tableNameHidden?: boolean,
  widgetNameHidden?: boolean,
}) {
  const isResizing = options.isResizing ?? Observable.create(null, false);
  const {gristDoc, sectionRowId, viewModel, draggable = true, focusable = true} = options;

  // Creating normal section dom
  const vs: ViewSectionRec = gristDoc.docModel.viewSections.getRowModel(sectionRowId);
  return dom('div.view_leaf.viewsection_content.flexvbox.flexauto',
    testId(`viewlayout-section-${sectionRowId}`),
    !options.isResizing ? dom.autoDispose(isResizing) : null,
    cssViewLeaf.cls(''),
    cssViewLeafInactive.cls('', (use) => !vs.isDisposed() && !use(vs.hasFocus)),
    dom.cls('active_section', vs.hasFocus),
    dom.cls('active_section--no-indicator', !focusable),
    dom.maybe<BaseView|null>((use) => use(vs.viewInstance), (viewInstance) => dom('div.viewsection_title.flexhbox',
      cssDragIcon('DragDrop',
        dom.cls("viewsection_drag_indicator"),
        // Makes element grabbable only if grist is not readonly.
        dom.cls('layout_grabbable', (use) => !use(gristDoc.isReadonlyKo)),
        !draggable ? dom.style("visibility", "hidden") : null
      ),
      dom.maybe((use) => use(use(viewInstance.viewSection.table).summarySourceTable), () =>
        cssSigmaIcon('Pivot', testId('sigma'))),
      buildWidgetTitle(vs, options, testId('viewsection-title'), cssTestClick(testId("viewsection-blank"))),
      viewInstance.buildTitleControls(),
      dom('div.viewsection_buttons',
        dom.create(viewSectionMenu, gristDoc, vs)
      )
     )),
    dom.create(filterBar, gristDoc, vs),
    dom.maybe<BaseView|null>(vs.viewInstance, (viewInstance) => [
      dom('div.view_data_pane_container.flexvbox',
        cssResizing.cls('', isResizing),
        dom.maybe(viewInstance.disableEditing, () =>
          dom('div.disable_viewpane.flexvbox', 'No data')
        ),
        dom.maybe(viewInstance.isTruncated, () =>
          dom('div.viewsection_truncated', 'Not all data is shown')
        ),
        dom.cls((use) => 'viewsection_type_' + use(vs.parentKey)),
        viewInstance.viewPane,
      ),
      dom.maybe(use => !use(isNarrowScreenObs()), () => viewInstance.selectionSummary?.buildDom()),
    ]),
    dom.on('mousedown', () => { viewModel?.activeSectionId(sectionRowId); }),
  );
}

// With new widgetPopup it is hard to click on viewSection without a activating it, hence we
// add a little blank space to use in test.
const cssTestClick = styled(`div`, `
  min-width: 2px;
`);

const cssSigmaIcon = styled(icon, `
  bottom: 1px;
  margin-right: 5px;
  background-color: ${theme.lightText}
`);

const cssViewLeaf = styled('div', `
  @media ${mediaSmall} {
    & {
      margin: 4px;
    }
  }
`);

const cssViewLeafInactive = styled('div', `
  @media screen and ${mediaSmall} {
    & {
      overflow: hidden;
      background: repeating-linear-gradient(
        -45deg,
        ${theme.widgetInactiveStripesDark},
        ${theme.widgetInactiveStripesDark} 10px,
        ${theme.widgetInactiveStripesLight} 10px,
        ${theme.widgetInactiveStripesLight} 20px
      );
      border: 1px solid ${theme.widgetBorder};
      border-radius: 4px;
      padding: 0 2px;
    }
    &::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
    }
    &.layout_vbox {
      max-width: 32px;
    }
    &.layout_hbox {
      max-height: 32px;
    }
    & > .viewsection_title.flexhbox {
      position: absolute;
    }
    & > .view_data_pane_container,
    & .viewsection_buttons,
    & .grist-single-record__menu,
    & > .filter_bar {
      display: none;
    }
  }
`);


// z-index ensure it's above the resizer line, since it's hard to grab otherwise
const cssDragIcon = styled(icon, `
  visibility: hidden;
  --icon-color: ${colors.slate};
  top: -1px;
  z-index: 100;

  .viewsection_title:hover &.layout_grabbable {
    visibility: visible;
  }
`);

// This class is added while sections are being resized (or otherwise edited), to ensure that the
// content of the section (such as an iframe) doesn't interfere with mouse drag-related events.
// (It assumes that contained elements do not set pointer-events to another value; if that were
// important then we'd need to use an overlay element during dragging.)
const cssResizing = styled('div', `
  pointer-events: none;
`);

const cssMiniSection = styled('div.mini_section_container', `
  --icon-color: ${colors.lightGreen};
  display: flex;
  background: ${theme.mainPanelBg};
  align-items: center;
  padding-right: 8px;
`);

const cssDragHandle = styled('div.draggable-handle', `
  display: flex;
  padding: 8px;
  flex: 1;
  padding-right: 16px;
`);