import { useEffect, useState } from "react";
import type { MobileWorkbenchSheetSnap } from "../components/mobile-workbench-sheet";
import { WORKBENCH_LAYOUT } from "../layout/workbench-layout";

const CONDITION_FEED_EXIT_MS = 170;
const CONDITION_FEED_EXPANDED_MIN_WIDTH = 1440;
const LARGE_SCREEN_QUERY = "(min-width: 1024px)";

type WorkbenchMobileSheet = "agent" | "condition" | "timeline" | null;

type UseWorkbenchResponsiveLayoutOptions = {
  activeToolOpen: boolean;
  agentPanelOpen: boolean;
  devPanelOpen: boolean;
  collapseAgentPanel: () => void;
  expandAgentPanel: () => void;
  onClearActiveTool: () => void;
};

export function useWorkbenchResponsiveLayout({
  activeToolOpen,
  agentPanelOpen,
  devPanelOpen,
  collapseAgentPanel,
  expandAgentPanel,
  onClearActiveTool
}: UseWorkbenchResponsiveLayoutOptions) {
  const [isLargeScreen, setIsLargeScreen] = useState(false);
  const [viewportWidth, setViewportWidth] = useState<number>(WORKBENCH_LAYOUT.desktopMinWidth);
  const [agentPanelWidth, setAgentPanelWidth] = useState<number>(
    WORKBENCH_LAYOUT.desktop.agentWidth
  );
  const [conditionFeedVisible, setConditionFeedVisible] = useState(false);
  const [conditionFeedMounted, setConditionFeedMounted] = useState(false);
  const [conditionFeedExpanded, setConditionFeedExpanded] = useState(false);
  const [mobileSheet, setMobileSheet] = useState<WorkbenchMobileSheet>(null);
  const [mobileSheetSnap, setMobileSheetSnap] = useState<MobileWorkbenchSheetSnap>("half");
  const [agentCollapsedForCondition, setAgentCollapsedForCondition] = useState(false);

  useEffect(() => {
    const mediaQuery = window.matchMedia(LARGE_SCREEN_QUERY);
    const handleViewportChange = () => {
      setIsLargeScreen(mediaQuery.matches);
      setViewportWidth(window.innerWidth);
      if (mediaQuery.matches) {
        setMobileSheet(null);
      }
    };

    handleViewportChange();
    setConditionFeedVisible(false);
    mediaQuery.addEventListener("change", handleViewportChange);
    window.addEventListener("resize", handleViewportChange);

    return () => {
      mediaQuery.removeEventListener("change", handleViewportChange);
      window.removeEventListener("resize", handleViewportChange);
    };
  }, []);

  const shouldShowConditionFeed = conditionFeedVisible && !activeToolOpen;

  useEffect(() => {
    if (shouldShowConditionFeed) {
      setConditionFeedMounted(true);
      return;
    }

    const timeoutId = window.setTimeout(() => {
      setConditionFeedMounted(false);
    }, CONDITION_FEED_EXIT_MS);

    return () => window.clearTimeout(timeoutId);
  }, [shouldShowConditionFeed]);

  function closeMobileSheet() {
    setMobileSheet(null);
  }

  function openAgentPanelForViewport() {
    if (isLargeScreen) {
      if (conditionFeedExpanded && viewportWidth < CONDITION_FEED_EXPANDED_MIN_WIDTH) {
        setConditionFeedExpanded(false);
        setAgentCollapsedForCondition(false);
      }
      expandAgentPanel();
      return;
    }

    setMobileSheet("agent");
    setMobileSheetSnap("half");
  }

  function handleConditionExpandedChange(nextExpanded: boolean) {
    if (nextExpanded && isLargeScreen && viewportWidth < CONDITION_FEED_EXPANDED_MIN_WIDTH) {
      setAgentCollapsedForCondition(agentPanelOpen);
      collapseAgentPanel();
    } else if (!nextExpanded && agentCollapsedForCondition) {
      setAgentCollapsedForCondition(false);
      expandAgentPanel();
    }
    setConditionFeedExpanded(nextExpanded);
  }

  useEffect(() => {
    if (!isLargeScreen || shouldShowConditionFeed || !conditionFeedExpanded) {
      return;
    }

    setConditionFeedExpanded(false);
    if (agentCollapsedForCondition) {
      setAgentCollapsedForCondition(false);
      expandAgentPanel();
    }
  }, [
    agentCollapsedForCondition,
    conditionFeedExpanded,
    expandAgentPanel,
    isLargeScreen,
    shouldShowConditionFeed
  ]);

  function toggleConditionFeedForViewport() {
    onClearActiveTool();
    if (isLargeScreen) {
      setConditionFeedVisible((current) => !current);
      return;
    }

    if (mobileSheet === "condition") {
      closeMobileSheet();
      return;
    }

    setConditionFeedExpanded(false);
    setMobileSheetSnap("half");
    setMobileSheet("condition");
  }

  function openConditionFeedForViewport() {
    setConditionFeedVisible(true);
    onClearActiveTool();
    if (!isLargeScreen) {
      setMobileSheet("condition");
      setMobileSheetSnap("half");
    }
  }

  function openTimelineForViewport() {
    if (isLargeScreen) return;
    setMobileSheet("timeline");
    setMobileSheetSnap("half");
  }

  const leftPanelOpen = isLargeScreen && agentPanelOpen;
  const rightPanelOpen = isLargeScreen && (devPanelOpen || shouldShowConditionFeed);
  const rightPanelExpanded =
    isLargeScreen && shouldShowConditionFeed && conditionFeedExpanded && !devPanelOpen;

  return {
    agentPanelWidth,
    closeMobileSheet,
    conditionFeedExpanded,
    conditionFeedMounted,
    handleConditionExpandedChange,
    isLargeScreen,
    leftPanelOpen,
    mobileSheet,
    mobileSheetSnap,
    openAgentPanelForViewport,
    openConditionFeedForViewport,
    openTimelineForViewport,
    rightPanelExpanded,
    rightPanelOpen,
    setAgentPanelWidth,
    setMobileSheetSnap,
    shouldShowConditionFeed,
    toggleConditionFeedForViewport,
    viewportWidth
  };
}