import React, { useEffect, useMemo, useState } from "react";
import { useLocation, useNavigate } from "react-router-dom";

import {
  Box,
  Button,
  Dialog,
  DialogActions,
  DialogContent,
  DialogTitle,
  Paper,
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableRow,
  TextField,
  Typography,
  IconButton,
} from "@mui/material";

import { api, getApiErrorMessage } from "../api";
import { Company } from "../types";
import EditOutlinedIcon from "@mui/icons-material/EditOutlined";
import { useToast } from "../toast";
import { useI18n } from "../i18n/I18nProvider";

export default function CompaniesTable() {
  const { toast } = useToast();
  const { t } = useI18n();
  const location = useLocation();
  const navigate = useNavigate();
  const [companies, setCompanies] = useState<Company[]>([]);
  const [editOpen, setEditOpen] = useState(false);
  const [editing, setEditing] = useState<Company | null>(null);

  const [recruiterName, setRecruiterName] = useState("");
  const [recruiterEmail, setRecruiterEmail] = useState("");
  const [recruiterLinkedIn, setRecruiterLinkedIn] = useState("");
  const [pipelineStage, setPipelineStage] = useState("");
  const [lastContactedAt, setLastContactedAt] = useState("");
  const [nextContactAt, setNextContactAt] = useState("");

  useEffect(() => {
    api.get<Company[]>("/companies").then((r) => setCompanies(r.data)).catch((error) => toast(getApiErrorMessage(error, t("companiesUpdateFailed")), "error"));
  }, [t, toast]);

  useEffect(() => {
    const params = new URLSearchParams(location.search);
    const editId = Number(params.get("edit") || 0);
    if (!editId || companies.length === 0) return;
    const company = companies.find((c) => c.id === editId);
    if (!company) return;
    openEdit(company);
    params.delete("edit");
    navigate({ pathname: location.pathname, search: params.toString() ? `?${params.toString()}` : "" }, { replace: true });
  }, [companies, location.pathname, location.search, navigate]);

  const openEdit = (c: Company) => {
    setEditing(c);
    setRecruiterName(c.recruiterName ?? "");
    setRecruiterEmail(c.recruiterEmail ?? "");
    setRecruiterLinkedIn(c.recruiterLinkedIn ?? "");
    setPipelineStage(c.pipelineStage ?? "");
    setLastContactedAt((c.lastContactedAt ?? "").slice(0, 10));
    setNextContactAt((c.nextContactAt ?? "").slice(0, 10));
    setEditOpen(true);
  };

  const canSave = useMemo(() => !!editing?.id, [editing]);

  const save = async () => {
    if (!editing?.id) return;
    try {
      const res = await api.put<Company>(`/companies/${editing.id}`, {
        name: editing.name,
        location: editing.location ?? null,
        source: editing.source ?? null,
        recruiterName: recruiterName.trim() || null,
        recruiterEmail: recruiterEmail.trim() || null,
        recruiterLinkedIn: recruiterLinkedIn.trim() || null,
        pipelineStage: pipelineStage.trim() || null,
        lastContactedAt: lastContactedAt || null,
        nextContactAt: nextContactAt || null,
      });

      setCompanies((prev) => prev.map((x) => (x.id === res.data.id ? res.data : x)));
      toast(t("companiesUpdated"), "success");
      setEditOpen(false);
      setEditing(null);
    } catch (error) {
      toast(getApiErrorMessage(error, t("companiesUpdateFailed")), "error");
    }
  };

  return (
    <Paper sx={{ mt: 0 }}>
      <Table>
        <TableHead>
          <TableRow>
            <TableCell>{t("companiesName")}</TableCell>
            <TableCell>{t("companiesLocation")}</TableCell>
            <TableCell>{t("companiesSource")}</TableCell>
            <TableCell>{t("companiesPipeline")}</TableCell>
            <TableCell>{t("companiesRecruiter")}</TableCell>
            <TableCell>{t("companiesNextContact")}</TableCell>
            <TableCell width={1} align="right" />
          </TableRow>
        </TableHead>
        <TableBody>
          {companies.map((c) => (
            <TableRow key={c.id}>
              <TableCell>{c.name}</TableCell>
              <TableCell>{c.location ?? ""}</TableCell>
              <TableCell>{c.source ?? ""}</TableCell>
              <TableCell>{c.pipelineStage ?? ""}</TableCell>
              <TableCell>
                {c.recruiterName ?? ""}
                {c.recruiterEmail ? ` (${c.recruiterEmail})` : ""}
              </TableCell>
              <TableCell>{c.nextContactAt ? new Date(c.nextContactAt).toLocaleDateString() : ""}</TableCell>
              <TableCell align="right">
                <IconButton size="small" onClick={() => openEdit(c)}>
                  <EditOutlinedIcon fontSize="small" />
                </IconButton>
              </TableCell>
            </TableRow>
          ))}
          {companies.length === 0 && (
            <TableRow>
              <TableCell colSpan={7}>
                <Typography sx={{ py: 2, textAlign: "center" }}>
                  {t("companiesEmpty")}
                </Typography>
              </TableCell>
            </TableRow>
          )}
        </TableBody>
      </Table>

      <Dialog open={editOpen} onClose={() => setEditOpen(false)} fullWidth maxWidth="sm">
        <DialogTitle>{t("companiesEdit")}</DialogTitle>
        <DialogContent>
          <Box sx={{ display: "grid", gridTemplateColumns: "1fr 1fr", gap: 2, mt: 1 }}>
            <TextField
              label={t("companiesName")}
              value={editing?.name ?? ""}
              onChange={(e) => setEditing((p) => (p ? { ...p, name: e.target.value } : p))}
              sx={{ gridColumn: "1 / -1" }}
            />
            <TextField
              label={t("companiesLocation")}
              value={editing?.location ?? ""}
              onChange={(e) => setEditing((p) => (p ? { ...p, location: e.target.value } : p))}
            />
            <TextField
              label={t("companiesSource")}
              value={editing?.source ?? ""}
              onChange={(e) => setEditing((p) => (p ? { ...p, source: e.target.value } : p))}
            />

            <TextField
              label={t("companiesPipelineStage")}
              value={pipelineStage}
              onChange={(e) => setPipelineStage(e.target.value)}
            />
            <TextField
              label={t("companiesRecruiterName")}
              value={recruiterName}
              onChange={(e) => setRecruiterName(e.target.value)}
            />
            <TextField
              label={t("companiesRecruiterEmail")}
              value={recruiterEmail}
              onChange={(e) => setRecruiterEmail(e.target.value)}
            />
            <TextField
              label={t("companiesRecruiterLinkedIn")}
              value={recruiterLinkedIn}
              onChange={(e) => setRecruiterLinkedIn(e.target.value)}
              sx={{ gridColumn: "1 / -1" }}
            />

            <TextField
              label={t("companiesLastContacted")}
              type="date"
              value={lastContactedAt}
              onChange={(e) => setLastContactedAt(e.target.value)}
              InputLabelProps={{ shrink: true }}
            />
            <TextField
              label={t("companiesNextContactField")}
              type="date"
              value={nextContactAt}
              onChange={(e) => setNextContactAt(e.target.value)}
              InputLabelProps={{ shrink: true }}
            />
          </Box>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setEditOpen(false)}>{t("cancel")}</Button>
          <Button variant="contained" onClick={save} disabled={!canSave}>
            {t("save")}
          </Button>
        </DialogActions>
      </Dialog>
    </Paper>
  );
}