import AutoAwesomeIcon from "@mui/icons-material/AutoAwesome";
import RefreshIcon from "@mui/icons-material/Refresh";
import {
  Alert,
  Box,
  Button,
  Chip,
  Paper,
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableRow,
  Typography
} from "@mui/material";
import { useQuery } from "@tanstack/react-query";
import { useTranslation } from "react-i18next";
import { useNavigate } from "react-router-dom";

import { fetchAiReviews } from "../api/aiReviews";
import { fetchServerConfig } from "../api/config";
import PageHeader from "../components/PageHeader";
import { formatDate } from "../utils/date";

function statusColor(status: string): "default" | "primary" | "success" | "warning" | "error" {
  if (status === "approved") return "success";
  if (status === "needs_review") return "primary";
  if (status === "failed") return "error";
  if (status === "analyzing" || status === "pending") return "warning";
  return "default";
}

export default function AiReviewList() {
  const { t } = useTranslation();
  const navigate = useNavigate();
  const {
    data: reviews,
    isLoading,
    isError,
    refetch,
    isFetching
  } = useQuery({
    queryKey: ["ai-reviews"],
    queryFn: () => fetchAiReviews()
  });
  const { data: serverConfig } = useQuery({
    queryKey: ["server-config"],
    queryFn: fetchServerConfig
  });

  return (
    <>
      <PageHeader
        title={t("aiReviews.title")}
        subtitle={t("aiReviews.subtitle")}
        action={
          <Button
            variant="outlined"
            startIcon={<RefreshIcon />}
            onClick={() => refetch()}
            disabled={isFetching}
          >
            {t("aiReviews.refresh")}
          </Button>
        }
      />

      {!serverConfig?.aiConfigured && (
        <Alert severity="warning" sx={{ mb: 2 }}>
          {t("aiReviews.aiNotConfigured")}
        </Alert>
      )}
      {!serverConfig?.paperlessWebhookConfigured && (
        <Alert severity="info" sx={{ mb: 2 }}>
          {t("aiReviews.webhookNotConfigured")}
        </Alert>
      )}

      <Paper variant="outlined" sx={{ borderRadius: 3, p: 2.5 }}>
        <Table>
          <TableHead>
            <TableRow>
              <TableCell>{t("aiReviews.columns.document")}</TableCell>
              <TableCell>{t("aiReviews.columns.status")}</TableCell>
              <TableCell>{t("aiReviews.columns.confidence")}</TableCell>
              <TableCell>{t("aiReviews.columns.updated")}</TableCell>
              <TableCell align="right">{t("aiReviews.columns.action")}</TableCell>
            </TableRow>
          </TableHead>
          <TableBody>
            {isLoading && (
              <TableRow>
                <TableCell colSpan={5}>{t("messages.loading")}</TableCell>
              </TableRow>
            )}
            {isError && (
              <TableRow>
                <TableCell colSpan={5}>
                  <Typography color="error">{t("aiReviews.loadError")}</Typography>
                </TableCell>
              </TableRow>
            )}
            {!isLoading && !isError && (reviews ?? []).length === 0 && (
              <TableRow>
                <TableCell colSpan={5}>
                  <Box display="flex" alignItems="center" gap={1}>
                    <AutoAwesomeIcon color="disabled" />
                    <Typography color="text.secondary">{t("aiReviews.empty")}</Typography>
                  </Box>
                </TableCell>
              </TableRow>
            )}
            {(reviews ?? []).map((review) => (
              <TableRow
                hover
                key={review.id}
                sx={{ cursor: "pointer" }}
                onClick={() => navigate(`/ai-reviews/${review.id}`)}
              >
                <TableCell>
                  <Typography fontWeight={600}>
                    {review.documentTitle ?? `${t("aiReviews.document")} #${review.paperlessDocumentId}`}
                  </Typography>
                  <Typography variant="caption" color="text.secondary">
                    Paperless #{review.paperlessDocumentId}
                  </Typography>
                </TableCell>
                <TableCell>
                  <Chip
                    size="small"
                    color={statusColor(review.status)}
                    label={t(`aiReviews.status.${review.status}`)}
                  />
                </TableCell>
                <TableCell>
                  {review.confidence !== null ? `${Math.round(review.confidence * 100)}%` : "-"}
                </TableCell>
                <TableCell>{formatDate(review.updatedAt, "dd.MM.yyyy HH:mm")}</TableCell>
                <TableCell align="right">
                  <Button size="small" onClick={(event) => {
                    event.stopPropagation();
                    navigate(`/ai-reviews/${review.id}`);
                  }}>
                    {t("aiReviews.review")}
                  </Button>
                </TableCell>
              </TableRow>
            ))}
          </TableBody>
        </Table>
      </Paper>
    </>
  );
}