import type { HttpResponse, HttpResponseEvent } from "@yaakapp-internal/models";
import classNames from "classnames";
import type { ComponentType, CSSProperties } from "react";
import { lazy, Suspense, useMemo } from "react";
import { useCancelHttpResponse } from "../hooks/useCancelHttpResponse";
import { useHttpResponseEvents } from "../hooks/useHttpResponseEvents";
import { usePinnedHttpResponse } from "../hooks/usePinnedHttpResponse";
import { useResponseBodyBytes, useResponseBodyText } from "../hooks/useResponseBodyText";
import { useResponseViewMode } from "../hooks/useResponseViewMode";
import { useTimelineViewMode } from "../hooks/useTimelineViewMode";
import { getMimeTypeFromContentType } from "../lib/contentType";
import { getContentTypeFromHeaders, getCookieCounts } from "../lib/model_util";
import { ConfirmLargeResponse } from "./ConfirmLargeResponse";
import { ConfirmLargeResponseRequest } from "./ConfirmLargeResponseRequest";
import { Banner } from "./core/Banner";
import { Button } from "./core/Button";
import { CountBadge } from "./core/CountBadge";
import { HotkeyList } from "./core/HotkeyList";
import { HttpResponseDurationTag } from "./core/HttpResponseDurationTag";
import { HttpStatusTag } from "./core/HttpStatusTag";
import { Icon } from "./core/Icon";
import { LoadingIcon } from "./core/LoadingIcon";
import { PillButton } from "./core/PillButton";
import { SizeTag } from "./core/SizeTag";
import { HStack, VStack } from "./core/Stacks";
import type { TabItem } from "./core/Tabs/Tabs";
import { TabContent, Tabs } from "./core/Tabs/Tabs";
import { Tooltip } from "./core/Tooltip";
import { EmptyStateText } from "./EmptyStateText";
import { ErrorBoundary } from "./ErrorBoundary";
import { HttpResponseTimeline } from "./HttpResponseTimeline";
import { RecentHttpResponsesDropdown } from "./RecentHttpResponsesDropdown";
import { RequestBodyViewer } from "./RequestBodyViewer";
import { ResponseCookies } from "./ResponseCookies";
import { ResponseHeaders } from "./ResponseHeaders";
import { AudioViewer } from "./responseViewers/AudioViewer";
import { CsvViewer } from "./responseViewers/CsvViewer";
import { EventStreamViewer } from "./responseViewers/EventStreamViewer";
import { HTMLOrTextViewer } from "./responseViewers/HTMLOrTextViewer";
import { ImageViewer } from "./responseViewers/ImageViewer";
import { MultipartViewer } from "./responseViewers/MultipartViewer";
import { SvgViewer } from "./responseViewers/SvgViewer";
import { VideoViewer } from "./responseViewers/VideoViewer";

const PdfViewer = lazy(() =>
  import("./responseViewers/PdfViewer").then((m) => ({ default: m.PdfViewer })),
);

interface Props {
  style?: CSSProperties;
  className?: string;
  activeRequestId: string;
}

const TAB_BODY = "body";
const TAB_REQUEST = "request";
const TAB_HEADERS = "headers";
const TAB_COOKIES = "cookies";
const TAB_TIMELINE = "timeline";

export type TimelineViewMode = "timeline" | "text";

interface RedirectDropWarning {
  droppedBodyCount: number;
  droppedHeaders: string[];
}

export function HttpResponsePane({ style, className, activeRequestId }: Props) {
  const { activeResponse, setPinnedResponseId, responses } = usePinnedHttpResponse(activeRequestId);
  const [viewMode, setViewMode] = useResponseViewMode(activeResponse?.requestId);
  const [timelineViewMode, setTimelineViewMode] = useTimelineViewMode();
  const contentType = getContentTypeFromHeaders(activeResponse?.headers ?? null);
  const mimeType = contentType == null ? null : getMimeTypeFromContentType(contentType).essence;

  const responseEvents = useHttpResponseEvents(activeResponse);
  const redirectDropWarning = useMemo(
    () => getRedirectDropWarning(responseEvents.data),
    [responseEvents.data],
  );
  const shouldShowRedirectDropWarning =
    activeResponse?.state === "closed" && redirectDropWarning != null;

  const cookieCounts = useMemo(() => getCookieCounts(responseEvents.data), [responseEvents.data]);

  const tabs = useMemo<TabItem[]>(
    () => [
      {
        value: TAB_BODY,
        label: "Response",
        options: {
          value: viewMode,
          onChange: setViewMode,
          items: [
            { label: "Response", value: "pretty" },
            ...(mimeType?.startsWith("image")
              ? []
              : [{ label: "Response (Raw)", shortLabel: "Raw", value: "raw" }]),
          ],
        },
      },
      {
        value: TAB_REQUEST,
        label: "Request",
        rightSlot:
          (activeResponse?.requestContentLength ?? 0) > 0 ? <CountBadge count={true} /> : null,
      },
      {
        value: TAB_HEADERS,
        label: "Headers",
        rightSlot: (
          <CountBadge
            count={activeResponse?.requestHeaders.length ?? 0}
            count2={activeResponse?.headers.length ?? 0}
            showZero
          />
        ),
      },
      {
        value: TAB_COOKIES,
        label: "Cookies",
        rightSlot:
          cookieCounts.sent > 0 || cookieCounts.received > 0 ? (
            <CountBadge count={cookieCounts.sent} count2={cookieCounts.received} showZero />
          ) : null,
      },
      {
        value: TAB_TIMELINE,
        rightSlot: <CountBadge count={responseEvents.data?.length ?? 0} />,
        options: {
          value: timelineViewMode,
          onChange: (v) => setTimelineViewMode((v as TimelineViewMode) ?? "timeline"),
          items: [
            { label: "Timeline", value: "timeline" },
            { label: "Timeline (Text)", shortLabel: "Timeline", value: "text" },
          ],
        },
      },
    ],
    [
      activeResponse?.headers,
      activeResponse?.requestContentLength,
      activeResponse?.requestHeaders.length,
      cookieCounts.sent,
      cookieCounts.received,
      mimeType,
      responseEvents.data?.length,
      setViewMode,
      viewMode,
      timelineViewMode,
      setTimelineViewMode,
    ],
  );

  const cancel = useCancelHttpResponse(activeResponse?.id ?? null);

  return (
    <div
      style={style}
      className={classNames(
        className,
        "x-theme-responsePane",
        "max-h-full h-full",
        "bg-surface rounded-md border border-border-subtle overflow-hidden",
        "relative",
      )}
    >
      {activeResponse == null ? (
        <HotkeyList hotkeys={["request.send", "model.create", "sidebar.focus", "url_bar.focus"]} />
      ) : (
        <div className="h-full w-full grid grid-rows-[auto_minmax(0,1fr)] grid-cols-1">
          <HStack
            className={classNames(
              "text-text-subtle w-full flex-shrink-0",
              // Remove a bit of space because the tabs have lots too
              "-mb-1.5",
            )}
          >
            {activeResponse && (
              <div
                className={classNames(
                  "grid grid-cols-[auto_minmax(4rem,1fr)_auto]",
                  "cursor-default select-none",
                  "whitespace-nowrap w-full pl-3 overflow-x-auto font-mono text-sm hide-scrollbars",
                )}
              >
                <HStack space={2} className="w-full flex-shrink-0">
                  {activeResponse.state !== "closed" && <LoadingIcon size="sm" />}
                  <HttpStatusTag showReason response={activeResponse} />
                  <span>&bull;</span>
                  <HttpResponseDurationTag response={activeResponse} />
                  <span>&bull;</span>
                  <SizeTag
                    contentLength={activeResponse.contentLength ?? 0}
                    contentLengthCompressed={activeResponse.contentLengthCompressed}
                  />
                </HStack>
                {shouldShowRedirectDropWarning ? (
                  <Tooltip
                    tabIndex={0}
                    className="my-auto pl-3 flex-shrink-0 max-w-full justify-self-end overflow-hidden"
                    content={
                      <VStack alignItems="start" space={1} className="text-xs">
                        <span className="font-medium text-warning">
                          Redirect changed this request
                        </span>
                        {redirectDropWarning.droppedBodyCount > 0 && (
                          <span>
                            Body dropped on {redirectDropWarning.droppedBodyCount}{" "}
                            {redirectDropWarning.droppedBodyCount === 1
                              ? "redirect hop"
                              : "redirect hops"}
                          </span>
                        )}
                        {redirectDropWarning.droppedHeaders.length > 0 && (
                          <span>
                            Headers dropped:{" "}
                            <span className="font-mono">
                              {redirectDropWarning.droppedHeaders.join(", ")}
                            </span>
                          </span>
                        )}
                        <span className="text-text-subtle">See Timeline for details.</span>
                      </VStack>
                    }
                  >
                    <span className="inline-flex min-w-0">
                      <PillButton
                        color="warning"
                        className="font-sans text-sm !flex-shrink max-w-full"
                        innerClassName="flex items-center"
                        leftSlot={<Icon icon="alert_triangle" size="xs" color="warning" />}
                      >
                        <span className="truncate">
                          {getRedirectWarningLabel(redirectDropWarning)}
                        </span>
                      </PillButton>
                    </span>
                  </Tooltip>
                ) : (
                  <span />
                )}
                <div className="justify-self-end flex-shrink-0">
                  <RecentHttpResponsesDropdown
                    responses={responses}
                    activeResponse={activeResponse}
                    onPinnedResponseId={setPinnedResponseId}
                  />
                </div>
              </div>
            )}
          </HStack>

          <div className="overflow-hidden flex flex-col min-h-0">
            {activeResponse?.error && (
              <Banner color="danger" className="mx-3 mt-1 flex-shrink-0">
                {activeResponse.error}
              </Banner>
            )}
            {/* Show tabs if we have any data (headers, body, etc.) even if there's an error */}
            <Tabs
              tabs={tabs}
              label="Response"
              className="ml-3 mr-3 mb-3 min-h-0 flex-1"
              tabListClassName="mt-0.5 -mb-1.5"
              storageKey="http_response_tabs"
              activeTabKey={activeRequestId}
            >
              <TabContent value={TAB_BODY}>
                <ErrorBoundary name="Http Response Viewer">
                  <Suspense>
                    <ConfirmLargeResponse response={activeResponse}>
                      {activeResponse.state === "initialized" ? (
                        <EmptyStateText>
                          <VStack space={3}>
                            <HStack space={3}>
                              <LoadingIcon className="text-text-subtlest" />
                              Sending Request
                            </HStack>
                            <Button size="sm" variant="border" onClick={() => cancel.mutate()}>
                              Cancel
                            </Button>
                          </VStack>
                        </EmptyStateText>
                      ) : activeResponse.state === "closed" &&
                        (activeResponse.contentLength ?? 0) === 0 ? (
                        <EmptyStateText>Empty</EmptyStateText>
                      ) : mimeType?.match(/^text\/event-stream/i) && viewMode === "pretty" ? (
                        <EventStreamViewer response={activeResponse} />
                      ) : mimeType?.match(/^image\/svg/) ? (
                        <HttpSvgViewer response={activeResponse} />
                      ) : mimeType?.match(/^image/i) ? (
                        <EnsureCompleteResponse response={activeResponse} Component={ImageViewer} />
                      ) : mimeType?.match(/^audio/i) ? (
                        <EnsureCompleteResponse response={activeResponse} Component={AudioViewer} />
                      ) : mimeType?.match(/^video/i) ? (
                        <EnsureCompleteResponse response={activeResponse} Component={VideoViewer} />
                      ) : mimeType?.match(/^multipart/i) && viewMode === "pretty" ? (
                        <HttpMultipartViewer response={activeResponse} />
                      ) : mimeType?.match(/pdf/i) ? (
                        <EnsureCompleteResponse response={activeResponse} Component={PdfViewer} />
                      ) : mimeType?.match(/csv|tab-separated/i) && viewMode === "pretty" ? (
                        <HttpCsvViewer className="pb-2" response={activeResponse} />
                      ) : (
                        <HTMLOrTextViewer
                          textViewerClassName="-mr-2 bg-surface" // Pull to the right
                          response={activeResponse}
                          pretty={viewMode === "pretty"}
                        />
                      )}
                    </ConfirmLargeResponse>
                  </Suspense>
                </ErrorBoundary>
              </TabContent>
              <TabContent value={TAB_REQUEST}>
                <ConfirmLargeResponseRequest response={activeResponse}>
                  <RequestBodyViewer response={activeResponse} />
                </ConfirmLargeResponseRequest>
              </TabContent>
              <TabContent value={TAB_HEADERS}>
                <ResponseHeaders response={activeResponse} />
              </TabContent>
              <TabContent value={TAB_COOKIES}>
                <ResponseCookies response={activeResponse} />
              </TabContent>
              <TabContent value={TAB_TIMELINE}>
                <HttpResponseTimeline response={activeResponse} viewMode={timelineViewMode} />
              </TabContent>
            </Tabs>
          </div>
        </div>
      )}
    </div>
  );
}

function getRedirectDropWarning(
  events: HttpResponseEvent[] | undefined,
): RedirectDropWarning | null {
  if (events == null || events.length === 0) return null;

  let droppedBodyCount = 0;
  const droppedHeaders = new Set<string>();
  for (const e of events) {
    const event = e.event;
    if (event.type !== "redirect") {
      continue;
    }

    if (event.dropped_body) {
      droppedBodyCount += 1;
    }
    for (const headerName of event.dropped_headers ?? []) {
      pushHeaderName(droppedHeaders, headerName);
    }
  }

  if (droppedBodyCount === 0 && droppedHeaders.size === 0) {
    return null;
  }

  return {
    droppedBodyCount,
    droppedHeaders: Array.from(droppedHeaders).sort(),
  };
}

function pushHeaderName(headers: Set<string>, headerName: string): void {
  const existing = Array.from(headers).find((h) => h.toLowerCase() === headerName.toLowerCase());
  if (existing == null) {
    headers.add(headerName);
  }
}

function getRedirectWarningLabel(warning: RedirectDropWarning): string {
  if (warning.droppedBodyCount > 0 && warning.droppedHeaders.length > 0) {
    return "Dropped body and headers";
  }
  if (warning.droppedBodyCount > 0) {
    return "Dropped body";
  }
  return "Dropped headers";
}

function EnsureCompleteResponse({
  response,
  Component,
}: {
  response: HttpResponse;
  Component: ComponentType<{ bodyPath: string }>;
}) {
  if (response.bodyPath === null) {
    return <div>Empty response body</div>;
  }

  // Wait until the response has been fully-downloaded
  if (response.state !== "closed") {
    return (
      <EmptyStateText>
        <LoadingIcon />
      </EmptyStateText>
    );
  }

  return <Component bodyPath={response.bodyPath} />;
}

function HttpSvgViewer({ response }: { response: HttpResponse }) {
  const body = useResponseBodyText({ response, filter: null });

  if (!body.data) return null;

  return <SvgViewer text={body.data} />;
}

function HttpCsvViewer({ response, className }: { response: HttpResponse; className?: string }) {
  const body = useResponseBodyText({ response, filter: null });

  return <CsvViewer text={body.data ?? null} className={className} />;
}

function HttpMultipartViewer({ response }: { response: HttpResponse }) {
  const body = useResponseBodyBytes({ response });

  if (body.data == null) return null;

  const contentTypeHeader = getContentTypeFromHeaders(response.headers);
  const boundary = contentTypeHeader?.split("boundary=")[1] ?? "unknown";

  return <MultipartViewer data={body.data} boundary={boundary} idPrefix={response.id} />;
}