import {getLoginOrSignupUrl, urlState} from 'app/client/models/gristUrlState';
import {HomeModel} from 'app/client/models/HomeModel';
import {productPill} from 'app/client/ui/AppHeader';
import * as css from 'app/client/ui/DocMenuCss';
import {createDocAndOpen, importDocAndOpen} from 'app/client/ui/HomeLeftPane';
import {manageTeamUsersApp} from 'app/client/ui/OpenUserManager';
import {bigBasicButton, cssButton} from 'app/client/ui2018/buttons';
import {testId, vars} from 'app/client/ui2018/cssVars';
import {icon} from 'app/client/ui2018/icons';
import {cssLink} from 'app/client/ui2018/links';
import {commonUrls, shouldHideUiElement} from 'app/common/gristUrls';
import {FullUser} from 'app/common/LoginSessionAPI';
import * as roles from 'app/common/roles';
import {dom, DomContents, styled} from 'grainjs';


export function buildHomeIntro(homeModel: HomeModel): DomContents {
  const user = homeModel.app.currentValidUser;
  if (user) {
    return homeModel.app.isTeamSite ? makeTeamSiteIntro(homeModel) : makePersonalIntro(homeModel, user);
  } else {
    return makeAnonIntro(homeModel);
  }
}

function makeTeamSiteIntro(homeModel: HomeModel) {
  const sproutsProgram = cssLink({href: commonUrls.sproutsProgram, target: '_blank'}, 'Sprouts Program');
  return [
    css.docListHeader(`Welcome to ${homeModel.app.currentOrgName}`,
      productPill(homeModel.app.currentOrg, {large: true}),
      testId('welcome-title')),
    cssIntroLine('Get started by inviting your team and creating your first Grist document.'),
    (shouldHideUiElement('helpCenter') ? null :
      cssIntroLine('Learn more in our ', helpCenterLink(), ', or find an expert via our ', sproutsProgram, '.',
        testId('welcome-text'))
    ),
    makeCreateButtons(homeModel),
  ];
}

function makePersonalIntro(homeModel: HomeModel, user: FullUser) {
  return [
    css.docListHeader(`Welcome to Grist, ${user.name}!`, testId('welcome-title')),
    cssIntroLine('Get started by creating your first Grist document.'),
    (shouldHideUiElement('helpCenter') ? null :
      cssIntroLine('Visit our ', helpCenterLink(), ' to learn more.',
        testId('welcome-text'))
    ),
    makeCreateButtons(homeModel),
  ];
}

function makeAnonIntro(homeModel: HomeModel) {
  const signUp = cssLink({href: getLoginOrSignupUrl()}, 'Sign up');
  return [
    css.docListHeader(`Welcome to Grist!`, testId('welcome-title')),
    cssIntroLine('Get started by exploring templates, or creating your first Grist document.'),
    cssIntroLine(signUp, ' to save your work.',
      (shouldHideUiElement('helpCenter') ? null : [' Visit our ', helpCenterLink(), ' to learn more.']),
      testId('welcome-text')),
    makeCreateButtons(homeModel),
  ];
}

function helpCenterLink() {
  return cssLink({href: commonUrls.help, target: '_blank'}, cssInlineIcon('Help'), 'Help Center');
}


function makeCreateButtons(homeModel: HomeModel) {
  const canManageTeam = homeModel.app.isTeamSite &&
    roles.canEditAccess(homeModel.app.currentOrg?.access || null);
  return cssBtnGroup(
    (canManageTeam ?
      cssBtn(cssBtnIcon('Help'), 'Invite Team Members', testId('intro-invite'),
        cssButton.cls('-primary'),
        dom.on('click', () => manageTeamUsersApp(homeModel.app)),
      ) :
      cssBtn(cssBtnIcon('FieldTable'), 'Browse Templates', testId('intro-templates'),
        cssButton.cls('-primary'),
        dom.hide(shouldHideUiElement("templates")),
        urlState().setLinkUrl({homePage: 'templates'}),
      )
    ),
    cssBtn(cssBtnIcon('Import'), 'Import Document', testId('intro-import-doc'),
      dom.on('click', () => importDocAndOpen(homeModel)),
    ),
    cssBtn(cssBtnIcon('Page'), 'Create Empty Document', testId('intro-create-doc'),
      dom.on('click', () => createDocAndOpen(homeModel)),
    ),
  );
}

const cssParagraph = styled(css.docBlock, `
  line-height: 1.6;
`);

const cssIntroLine = styled(cssParagraph, `
  font-size: ${vars.introFontSize};
  margin-bottom: 8px;
`);

const cssBtnGroup = styled('div', `
  display: inline-flex;
  flex-direction: column;
  align-items: stretch;
`);

const cssBtn = styled(bigBasicButton, `
  display: flex;
  align-items: center;
  margin-right: 16px;
  margin-top: 16px;
  text-align: left;
`);

const cssBtnIcon = styled(icon, `
  margin-right: 8px;
`);

const cssInlineIcon = styled(icon, `
  margin: -2px 4px 2px 4px;
`);