import React, { useState } from "react";
import { Button, Col, Form, Row, Table } from "react-bootstrap";
import { Link, useHistory } from "react-router-dom";
import { FormattedNumber } from "react-intl";
import querystring from "query-string";

import * as GQL from "src/core/generated-graphql";
import {
  LoadingIndicator,
  ErrorMessage,
  HoverPopover,
} from "src/components/Shared";
import { Pagination } from "src/components/List/Pagination";
import { TextUtils } from "src/utils";
import { DeleteScenesDialog } from "src/components/Scenes/DeleteScenesDialog";

const CLASSNAME = "DuplicateChecker";

export const SettingsDuplicatePanel: React.FC = () => {
  const history = useHistory();
  const { page, size, distance } = querystring.parse(history.location.search);
  const currentPage = Number.parseInt(
    Array.isArray(page) ? page[0] : page ?? "1",
    10
  );
  const pageSize = Number.parseInt(
    Array.isArray(size) ? size[0] : size ?? "20",
    10
  );
  const hashDistance = Number.parseInt(
    Array.isArray(distance) ? distance[0] : distance ?? "0",
    10
  );
  const [isMultiDelete, setIsMultiDelete] = useState(false);
  const [checkedScenes, setCheckedScenes] = useState<Record<string, boolean>>(
    {}
  );
  const { data, loading, refetch } = GQL.useFindDuplicateScenesQuery({
    fetchPolicy: "no-cache",
    variables: { distance: hashDistance },
  });
  const [deletingScene, setDeletingScene] = useState<
    GQL.SlimSceneDataFragment[] | null
  >(null);

  if (loading) return <LoadingIndicator />;
  if (!data) return <ErrorMessage error="Error searching for duplicates." />;

  const scenes = data?.findDuplicateScenes ?? [];
  const filteredScenes = scenes.slice(
    (currentPage - 1) * pageSize,
    currentPage * pageSize
  );
  const checkCount = Object.keys(checkedScenes).filter(
    (id) => checkedScenes[id]
  ).length;

  const setQuery = (q: Record<string, string | number | undefined>) => {
    history.push({
      search: querystring.stringify({
        ...querystring.parse(history.location.search),
        ...q,
      }),
    });
  };

  function onDeleteDialogClosed(deleted: boolean) {
    setDeletingScene(null);
    if (deleted) {
      refetch();
      if (isMultiDelete) setCheckedScenes({});
    }
  }

  const handleCheck = (checked: boolean, sceneID: string) => {
    setCheckedScenes({ ...checkedScenes, [sceneID]: checked });
  };

  const handleDeleteChecked = () => {
    setDeletingScene(scenes.flat().filter((s) => checkedScenes[s.id]));
    setIsMultiDelete(true);
  };

  const handleDeleteScene = (scene: GQL.SlimSceneDataFragment) => {
    setDeletingScene([scene]);
    setIsMultiDelete(false);
  };

  const renderFilesize = (filesize: string | null | undefined) => {
    const { size: parsedSize, unit } = TextUtils.fileSize(
      Number.parseInt(filesize ?? "0", 10)
    );
    return (
      <FormattedNumber
        value={parsedSize}
        style="unit"
        unit={unit}
        unitDisplay="narrow"
        maximumFractionDigits={2}
      />
    );
  };

  return (
    <div className={CLASSNAME}>
      {deletingScene && (
        <DeleteScenesDialog
          selected={deletingScene}
          onClose={onDeleteDialogClosed}
        />
      )}
      <h4>Duplicate Scenes</h4>
      <Form.Group>
        <Row noGutters>
          <Form.Label>Search Accuracy</Form.Label>
          <Col xs={2}>
            <Form.Control
              as="select"
              onChange={(e) =>
                setQuery({
                  distance:
                    e.currentTarget.value === "0"
                      ? undefined
                      : e.currentTarget.value,
                  page: undefined,
                })
              }
              defaultValue={distance ?? 0}
              className="ml-4"
            >
              <option value={0}>Exact</option>
              <option value={4}>High</option>
              <option value={8}>Medium</option>
              <option value={10}>Low</option>
            </Form.Control>
          </Col>
        </Row>
        <Form.Text>
          Levels below &ldquo;Exact&rdquo; can take longer to calculate. False
          positives might also be returned on lower accuracy levels.
        </Form.Text>
      </Form.Group>
      <div className="d-flex mb-2">
        <h6 className="mr-auto align-self-center">
          {scenes.length} sets of duplicates found.
        </h6>
        {checkCount > 0 && (
          <Button
            className="edit-button"
            variant="danger"
            onClick={handleDeleteChecked}
          >
            Delete {checkCount} scene{checkCount > 1 && "s"}
          </Button>
        )}
        <Pagination
          itemsPerPage={pageSize}
          currentPage={currentPage}
          totalItems={scenes.length}
          onChangePage={(newPage) =>
            setQuery({ page: newPage === 1 ? undefined : newPage })
          }
        />
        <Form.Control
          as="select"
          className="w-auto ml-2 btn-secondary"
          defaultValue={pageSize}
          onChange={(e) =>
            setQuery({
              size:
                e.currentTarget.value === "20"
                  ? undefined
                  : e.currentTarget.value,
            })
          }
        >
          <option value={10}>10</option>
          <option value={20}>20</option>
          <option value={40}>40</option>
          <option value={60}>60</option>
          <option value={80}>80</option>
        </Form.Control>
      </div>
      <Table striped className={`${CLASSNAME}-table`}>
        <colgroup>
          <col className={`${CLASSNAME}-checkbox`} />
          <col className={`${CLASSNAME}-sprite`} />
          <col className={`${CLASSNAME}-title`} />
          <col className={`${CLASSNAME}-duration`} />
          <col className={`${CLASSNAME}-filesize`} />
          <col className={`${CLASSNAME}-resolution`} />
          <col className={`${CLASSNAME}-bitrate`} />
          <col className={`${CLASSNAME}-codec`} />
          <col className={`${CLASSNAME}-operations`} />
        </colgroup>
        <thead>
          <tr>
            <th> </th>
            <th> </th>
            <th>Title</th>
            <th>Duration</th>
            <th>Filesize</th>
            <th>Resolution</th>
            <th>Bitrate</th>
            <th>Codec</th>
            <th>Delete</th>
          </tr>
        </thead>
        <tbody>
          {filteredScenes.map((group) =>
            group.map((scene, i) => (
              <tr className={i === 0 ? "duplicate-group" : ""} key={scene.id}>
                <td>
                  <Form.Check
                    onChange={(e) =>
                      handleCheck(e.currentTarget.checked, scene.id)
                    }
                  />
                </td>
                <td>
                  <HoverPopover
                    content={
                      <img src={scene.paths.sprite ?? ""} alt="" width={600} />
                    }
                    placement="right"
                  >
                    <img src={scene.paths.sprite ?? ""} alt="" width={100} />
                  </HoverPopover>
                </td>
                <td className="text-left">
                  <Link to={`/scenes/${scene.id}`}>
                    {scene.title ?? TextUtils.fileNameFromPath(scene.path)}
                  </Link>
                </td>
                <td>
                  {scene.file.duration &&
                    TextUtils.secondsToTimestamp(scene.file.duration)}
                </td>
                <td>{renderFilesize(scene.file.size)}</td>
                <td>{`${scene.file.width}x${scene.file.height}`}</td>
                <td>
                  <FormattedNumber
                    value={(scene.file.bitrate ?? 0) / 1000000}
                    maximumFractionDigits={2}
                  />
                  &nbsp;mbps
                </td>
                <td>{scene.file.video_codec}</td>
                <td>
                  <Button
                    className="edit-button"
                    variant="danger"
                    onClick={() => handleDeleteScene(scene)}
                  >
                    Delete
                  </Button>
                </td>
              </tr>
            ))
          )}
        </tbody>
      </Table>
      {scenes.length === 0 && (
        <h4 className="text-center mt-4">
          No duplicates found. Make sure the phash task has been run.
        </h4>
      )}
    </div>
  );
};