import {Fragment, useCallback, useEffect, useState} from 'react';
import {browserHistory} from 'react-router';
import styled from '@emotion/styled';
import {motion} from 'framer-motion';
import * as qs from 'query-string';

import {loadDocs} from 'sentry/actionCreators/projects';
import {Alert} from 'sentry/components/alert';
import ExternalLink from 'sentry/components/links/externalLink';
import LoadingError from 'sentry/components/loadingError';
import {DocumentationWrapper} from 'sentry/components/onboarding/documentationWrapper';
import {Footer} from 'sentry/components/onboarding/footer';
import {PlatformKey} from 'sentry/data/platformCategories';
import platforms from 'sentry/data/platforms';
import {t, tct} from 'sentry/locale';
import {space} from 'sentry/styles/space';
import {Project} from 'sentry/types';
import trackAdvancedAnalyticsEvent from 'sentry/utils/analytics/trackAdvancedAnalyticsEvent';
import getDynamicText from 'sentry/utils/getDynamicText';
import {platformToIntegrationMap} from 'sentry/utils/integrationUtil';
import useApi from 'sentry/utils/useApi';
import useOrganization from 'sentry/utils/useOrganization';
import useProjects from 'sentry/utils/useProjects';

import FirstEventFooter from './components/firstEventFooter';
import FullIntroduction from './components/fullIntroduction';
import ProjectSidebarSection from './components/projectSidebarSection';
import IntegrationSetup from './integrationSetup';
import {StepProps} from './types';
import {usePersistedOnboardingState} from './utils';

/**
 * The documentation will include the following string should it be missing the
 * verification example, which currently a lot of docs are.
 */
const INCOMPLETE_DOC_FLAG = 'TODO-ADD-VERIFICATION-EXAMPLE';

type PlatformDoc = {html: string; link: string};

type Props = {
  search: string;
} & StepProps;

function ProjectDocs(props: {
  hasError: boolean;
  onRetry: () => void;
  platform: PlatformKey | null;
  platformDocs: PlatformDoc | null;
  project: Project;
}) {
  const testOnlyAlert = (
    <Alert type="warning">
      Platform documentation is not rendered in for tests in CI
    </Alert>
  );
  const missingExampleWarning = () => {
    const missingExample =
      props.platformDocs && props.platformDocs.html.includes(INCOMPLETE_DOC_FLAG);

    if (!missingExample) {
      return null;
    }

    return (
      <Alert type="warning" showIcon>
        {tct(
          `Looks like this getting started example is still undergoing some
           work and doesn't include an example for triggering an event quite
           yet. If you have trouble sending your first event be sure to consult
           the [docsLink:full documentation] for [platform].`,
          {
            docsLink: <ExternalLink href={props.platformDocs?.link} />,
            platform: platforms.find(p => p.id === props.platform)?.name,
          }
        )}
      </Alert>
    );
  };

  const docs = props.platformDocs !== null && (
    <DocsWrapper key={props.platformDocs.html}>
      <DocumentationWrapper dangerouslySetInnerHTML={{__html: props.platformDocs.html}} />
      {missingExampleWarning()}
    </DocsWrapper>
  );

  const loadingError = (
    <LoadingError
      message={t(
        'Failed to load documentation for the %s platform.',
        props.project?.platform
      )}
      onRetry={props.onRetry}
    />
  );

  const currentPlatform = props.platform ?? props.project?.platform ?? 'other';
  return (
    <Fragment>
      <FullIntroduction currentPlatform={currentPlatform} />
      {getDynamicText({
        value: !props.hasError ? docs : loadingError,
        fixed: testOnlyAlert,
      })}
    </Fragment>
  );
}

function SetupDocs({search, route, router, location}: Props) {
  const api = useApi();
  const organization = useOrganization();
  const {projects: rawProjects} = useProjects();
  const [clientState, setClientState] = usePersistedOnboardingState();

  const heartbeatFooter = !!organization?.features.includes(
    'onboarding-heartbeat-footer'
  );

  const singleSelectPlatform = !!organization?.features.includes(
    'onboarding-remove-multiselect-platform'
  );

  const selectedPlatforms = clientState?.selectedPlatforms || [];
  const platformToProjectIdMap = clientState?.platformToProjectIdMap || {};
  // id is really slug here
  const projectSlugs = selectedPlatforms
    .map(platform => platformToProjectIdMap[platform])
    .filter((slug): slug is string => slug !== undefined);

  const selectedProjectsSet = new Set(projectSlugs);
  // get projects in the order they appear in selectedPlatforms
  const projects = projectSlugs
    .map(slug => rawProjects.find(project => project.slug === slug))
    .filter((project): project is Project => project !== undefined);

  // SDK instrumentation
  const [hasError, setHasError] = useState(false);
  const [platformDocs, setPlatformDocs] = useState<PlatformDoc | null>(null);
  const [loadedPlatform, setLoadedPlatform] = useState<PlatformKey | null>(null);

  // store what projects have sent first event in state based project.firstEvent
  const [hasFirstEventMap, setHasFirstEventMap] = useState<Record<string, boolean>>(
    projects.reduce((accum, project: Project) => {
      accum[project.id] = !!project.firstEvent;
      return accum;
    }, {} as Record<string, boolean>)
  );

  const checkProjectHasFirstEvent = (project: Project) => {
    return !!hasFirstEventMap[project.id];
  };

  const {project_id: rawProjectId} = qs.parse(search);
  const rawProjectIndex = projects.findIndex(p => p.id === rawProjectId);
  const firstProjectNoError = projects.findIndex(p => selectedProjectsSet.has(p.slug));
  // Select a project based on search params. If non exist, use the first project without first event.
  const projectIndex = rawProjectIndex >= 0 ? rawProjectIndex : firstProjectNoError;
  const project = projects[projectIndex];
  // find the next project that doesn't have a first event
  const nextProject = projects.find(
    (p, i) => i > projectIndex && !checkProjectHasFirstEvent(p)
  );

  const integrationSlug = project?.platform && platformToIntegrationMap[project.platform];
  const [integrationUseManualSetup, setIntegrationUseManualSetup] = useState(false);

  const currentPlatform = loadedPlatform ?? project?.platform ?? 'other';

  const fetchData = useCallback(async () => {
    // TODO: add better error handling logic
    if (!project?.platform) {
      return;
    }
    if (integrationSlug && !integrationUseManualSetup) {
      setLoadedPlatform(project.platform);
      setPlatformDocs(null);
      setHasError(false);
      return;
    }
    try {
      const loadedDocs = await loadDocs(
        api,
        organization.slug,
        project.slug,
        project.platform
      );
      setPlatformDocs(loadedDocs);
      setLoadedPlatform(project.platform);
      setHasError(false);
    } catch (error) {
      setHasError(error);
      throw error;
    }
  }, [project, api, organization, integrationSlug, integrationUseManualSetup]);

  useEffect(() => {
    fetchData();
  }, [fetchData]);

  if (!project) {
    return null;
  }

  const setNewProject = (newProjectId: string) => {
    setLoadedPlatform(null);
    setPlatformDocs(null);
    setHasError(false);
    setIntegrationUseManualSetup(false);
    const searchParams = new URLSearchParams({
      sub_step: 'project',
      project_id: newProjectId,
    });
    browserHistory.push(`${window.location.pathname}?${searchParams}`);
    clientState &&
      setClientState({
        ...clientState,
        state: 'projects_selected',
        url: `setup-docs/?${searchParams}`,
      });
  };

  const selectProject = (newProjectId: string) => {
    const matchedProject = projects.find(p => p.id === newProjectId);
    trackAdvancedAnalyticsEvent('growth.onboarding_clicked_project_in_sidebar', {
      organization,
      platform: matchedProject?.platform || 'unknown',
    });
    setNewProject(newProjectId);
  };

  return (
    <Fragment>
      <Wrapper>
        {!singleSelectPlatform && (
          <SidebarWrapper>
            <ProjectSidebarSection
              projects={projects}
              selectedPlatformToProjectIdMap={Object.fromEntries(
                selectedPlatforms.map(platform => [
                  platform,
                  platformToProjectIdMap[platform],
                ])
              )}
              activeProject={project}
              {...{checkProjectHasFirstEvent, selectProject}}
            />
          </SidebarWrapper>
        )}
        <MainContent>
          {integrationSlug && !integrationUseManualSetup ? (
            <IntegrationSetup
              integrationSlug={integrationSlug}
              project={project}
              onClickManualSetup={() => {
                setIntegrationUseManualSetup(true);
              }}
            />
          ) : (
            <ProjectDocs
              platform={loadedPlatform}
              project={project}
              hasError={hasError}
              platformDocs={platformDocs}
              onRetry={fetchData}
            />
          )}
        </MainContent>
      </Wrapper>

      {project &&
        (heartbeatFooter ? (
          <Footer
            projectSlug={project.slug}
            projectId={project.id}
            route={route}
            router={router}
            location={location}
            newOrg
          />
        ) : (
          <FirstEventFooter
            project={project}
            organization={organization}
            isLast={!nextProject}
            hasFirstEvent={checkProjectHasFirstEvent(project)}
            onClickSetupLater={() => {
              const orgIssuesURL = `/organizations/${organization.slug}/issues/?project=${project.id}&referrer=onboarding-setup-docs`;
              trackAdvancedAnalyticsEvent(
                'growth.onboarding_clicked_setup_platform_later',
                {
                  organization,
                  platform: currentPlatform,
                  project_index: projectIndex,
                }
              );
              if (!project.platform || !clientState) {
                browserHistory.push(orgIssuesURL);
                return;
              }
              // if we have a next project, switch to that
              if (nextProject) {
                setNewProject(nextProject.id);
              } else {
                setClientState({
                  ...clientState,
                  state: 'finished',
                });
                browserHistory.push(orgIssuesURL);
              }
            }}
            handleFirstIssueReceived={() => {
              const newHasFirstEventMap = {...hasFirstEventMap, [project.id]: true};
              setHasFirstEventMap(newHasFirstEventMap);
            }}
          />
        ))}
    </Fragment>
  );
}

export default SetupDocs;

const AnimatedContentWrapper = styled(motion.div)`
  overflow: hidden;
`;
AnimatedContentWrapper.defaultProps = {
  initial: {
    height: 0,
  },
  animate: {
    height: 'auto',
  },
  exit: {
    height: 0,
  },
};

const DocsWrapper = styled(motion.div)``;

DocsWrapper.defaultProps = {
  initial: {opacity: 0, y: 40},
  animate: {opacity: 1, y: 0},
  exit: {opacity: 0},
};

const Wrapper = styled('div')`
  display: flex;
  flex-direction: row;
  margin: ${space(2)};
  justify-content: center;
`;

const MainContent = styled('div')`
  max-width: 850px;
  min-width: 0;
  flex-grow: 1;
`;

// the number icon will be space(2) + 30px to the left of the margin of center column
// so we need to offset the right margin by that much
// also hide the sidebar if the screen is too small
const SidebarWrapper = styled('div')`
  margin: ${space(1)} calc(${space(2)} + 30px + ${space(4)}) 0 ${space(2)};
  @media (max-width: 1150px) {
    display: none;
  }
  flex-basis: 240px;
  flex-grow: 0;
  flex-shrink: 0;
  min-width: 240px;
`;