import { useEffect, type DragEvent } from "react";
import { api } from "~/utils/api";
import { isEqual } from "lodash-es";
import { type Scenario } from "./types";
import { useExperiment, useExperimentAccess, useHandledAsyncCallback } from "~/utils/hooks";
import { useState } from "react";

import {
  Box,
  Button,
  HStack,
  Icon,
  IconButton,
  Spinner,
  Stack,
  Tooltip,
  VStack,
  Text,
} from "@chakra-ui/react";
import { cellPadding } from "../constants";
import { BsArrowsAngleExpand, BsX } from "react-icons/bs";
import { RiDraggable } from "react-icons/ri";
import { FloatingLabelInput } from "./FloatingLabelInput";
import { ScenarioEditorModal } from "./ScenarioEditorModal";

export default function ScenarioEditor({
  scenario,
  ...props
}: {
  scenario: Scenario;
  hovered: boolean;
  canHide: boolean;
}) {
  const { canModify } = useExperimentAccess();

  const savedValues = scenario.variableValues as Record<string, string>;
  const utils = api.useContext();
  const [isDragTarget, setIsDragTarget] = useState(false);
  const [variableInputHovered, setVariableInputHovered] = useState(false);

  const [values, setValues] = useState<Record<string, string>>(savedValues);

  useEffect(() => {
    if (savedValues) setValues(savedValues);
  }, [savedValues]);

  const experiment = useExperiment();
  const vars = api.templateVars.list.useQuery({ experimentId: experiment.data?.id ?? "" });

  const variableLabels = vars.data?.map((v) => v.label) ?? [];

  const hasChanged = !isEqual(savedValues, values);

  const mutation = api.scenarios.replaceWithValues.useMutation();

  const [onSave] = useHandledAsyncCallback(async () => {
    await mutation.mutateAsync({
      id: scenario.id,
      values,
    });
    await utils.scenarios.list.invalidate();
  }, [mutation, values]);

  const hideMutation = api.scenarios.hide.useMutation();
  const [onHide, hidingInProgress] = useHandledAsyncCallback(async () => {
    await hideMutation.mutateAsync({
      id: scenario.id,
    });
    await utils.scenarios.list.invalidate();
    await utils.promptVariants.stats.invalidate();
  }, [hideMutation, scenario.id]);

  const reorderMutation = api.scenarios.reorder.useMutation();
  const [onReorder] = useHandledAsyncCallback(
    async (e: DragEvent<HTMLDivElement>) => {
      e.preventDefault();
      setIsDragTarget(false);
      const draggedId = e.dataTransfer.getData("text/plain");
      const droppedId = scenario.id;
      if (!draggedId || !droppedId || draggedId === droppedId) return;
      await reorderMutation.mutateAsync({
        draggedId,
        droppedId,
      });
      await utils.scenarios.list.invalidate();
    },
    [reorderMutation, scenario.id],
  );

  const [scenarioEditorModalOpen, setScenarioEditorModalOpen] = useState(false);

  return (
    <>
      <HStack
        alignItems="flex-start"
        px={cellPadding.x}
        py={cellPadding.y}
        spacing={0}
        height="100%"
        draggable={!variableInputHovered}
        onDragStart={(e) => {
          e.dataTransfer.setData("text/plain", scenario.id);
          e.currentTarget.style.opacity = "0.4";
        }}
        onDragEnd={(e) => {
          e.currentTarget.style.opacity = "1";
        }}
        onDragOver={(e) => {
          e.preventDefault();
          setIsDragTarget(true);
        }}
        onDragLeave={() => {
          setIsDragTarget(false);
        }}
        onDrop={onReorder}
        backgroundColor={isDragTarget ? "gray.100" : "transparent"}
      >
        {canModify && props.canHide && (
          <Stack
            alignSelf="flex-start"
            opacity={props.hovered ? 1 : 0}
            spacing={0}
            ml={-cellPadding.x}
          >
            <Tooltip label="Hide scenario" hasArrow>
              {/* for some reason the tooltip can't position itself properly relative to the icon without the wrapping box */}
              <Button
                variant="unstyled"
                color="gray.400"
                height="unset"
                width="unset"
                minW="unset"
                onClick={onHide}
                _hover={{
                  color: "gray.800",
                  cursor: "pointer",
                }}
              >
                <Icon as={hidingInProgress ? Spinner : BsX} boxSize={hidingInProgress ? 4 : 6} />
              </Button>
            </Tooltip>
            <Icon
              as={RiDraggable}
              boxSize={6}
              color="gray.400"
              _hover={{ color: "gray.800", cursor: "pointer" }}
            />
          </Stack>
        )}

        {variableLabels.length === 0 ? (
          <Box color="gray.500">
            {vars.data ? "No scenario variables configured" : "Loading..."}
          </Box>
        ) : (
          <VStack spacing={4} flex={1} py={2}>
            <HStack justifyContent="space-between" w="100%">
              <Text color="gray.500">Scenario</Text>
              <IconButton
                className="fullscreen-toggle"
                aria-label="Maximize"
                icon={<BsArrowsAngleExpand />}
                onClick={() => setScenarioEditorModalOpen(true)}
                boxSize={6}
                borderRadius={4}
                p={1.5}
                minW={0}
                colorScheme="gray"
                color="gray.500"
                variant="ghost"
              />
            </HStack>
            {variableLabels.map((key) => {
              const value = values[key] ?? "";
              return (
                <FloatingLabelInput
                  key={key}
                  label={key}
                  isDisabled={!canModify}
                  style={{ width: "100%" }}
                  maxHeight={32}
                  value={value}
                  onChange={(e) => {
                    setValues((prev) => ({ ...prev, [key]: e.target.value }));
                  }}
                  onKeyDown={(e) => {
                    if (e.key === "Enter" && (e.metaKey || e.ctrlKey)) {
                      e.preventDefault();
                      e.currentTarget.blur();
                      onSave();
                    }
                  }}
                  onMouseEnter={() => setVariableInputHovered(true)}
                  onMouseLeave={() => setVariableInputHovered(false)}
                />
              );
            })}
            {hasChanged && (
              <HStack justify="right">
                <Button
                  size="sm"
                  onMouseDown={() => {
                    setValues(savedValues);
                  }}
                  colorScheme="gray"
                >
                  Reset
                </Button>
                <Button size="sm" onMouseDown={onSave} colorScheme="blue">
                  Save
                </Button>
              </HStack>
            )}
          </VStack>
        )}
      </HStack>
      {scenarioEditorModalOpen && (
        <ScenarioEditorModal
          scenarioId={scenario.id}
          initialValues={savedValues}
          onClose={() => setScenarioEditorModalOpen(false)}
        />
      )}
    </>
  );
}