import React, { useEffect, useState } from "react";

import { Box, Button, Paper, TextField, Typography } from "@mui/material";

import { api } from "../api";
import { useToast } from "../toast";
import { useDialogActions } from "../dialogs";
import { useI18n } from "../i18n/I18nProvider";

type UserDto = {
  id: string;
  email?: string | null;
  userName?: string | null;
  emailConfirmed: boolean;
  roles: string[];
};

export default function UserManagementCard() {
  const { toast } = useToast();
  const { confirmAction } = useDialogActions();
  const { t } = useI18n();

  const [supported, setSupported] = useState<boolean | null>(null);
  const [users, setUsers] = useState<UserDto[]>([]);
  const [loading, setLoading] = useState(false);

  const [newEmail, setNewEmail] = useState("");
  const [newPassword, setNewPassword] = useState("");
  const [newIsAdmin, setNewIsAdmin] = useState(false);

  async function load() {
    setLoading(true);
    try {
      const res = await api.get<UserDto[]>("/users");
      setUsers(res.data ?? []);
      setSupported(true);
    } catch (e: any) {
      const status = e?.response?.status;
      if (status === 401 || status === 403) {
        setSupported(false);
      } else {
        toast(t("adminUsersLoadFailed"), "error");
        setSupported(false);
      }
    } finally {
      setLoading(false);
    }
  }

  useEffect(() => {
    void load();
    const onAuthChanged = () => { void load(); };
    window.addEventListener("auth-changed", onAuthChanged);
    return () => window.removeEventListener("auth-changed", onAuthChanged);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  if (supported === false) return null;
  if (supported === null) return null;

  return (
    <Paper sx={{ mt: 2, p: 2 }}>
      <Typography variant="h6" sx={{ mb: 1 }}>
        {t("adminUsersTitle")}
      </Typography>
      <Typography sx={{ color: "text.secondary", mb: 2 }}>
        {t("adminUsersSubtitle")}
      </Typography>

      <Box sx={{ display: "grid", gridTemplateColumns: "1fr 1fr", gap: 1.5 }}>
        <TextField
          label={t("profileEmail")}
          value={newEmail}
          onChange={(e) => setNewEmail(e.target.value)}
          fullWidth
        />
        <TextField
          label={t("adminUsersPassword")}
          value={newPassword}
          onChange={(e) => setNewPassword(e.target.value)}
          type="password"
          fullWidth
        />
      </Box>

      <Box sx={{ display: "flex", alignItems: "center", justifyContent: "space-between", gap: 1, mt: 1.5 }}>
        <Button
          variant={newIsAdmin ? "contained" : "outlined"}
          onClick={() => setNewIsAdmin((v) => !v)}
        >
          {newIsAdmin ? t("adminUsersAdminYes") : t("adminUsersAdminNo")}
        </Button>
        <Button
          variant="contained"
          disabled={loading}
          onClick={async () => {
            try {
              await api.post("/users", {
                email: newEmail,
                password: newPassword,
                roles: newIsAdmin ? ["Admin"] : [],
              });
              setNewEmail("");
              setNewPassword("");
              setNewIsAdmin(false);
              toast(t("adminUsersCreated"), "success");
              await load();
            } catch (e: any) {
              const msg = e?.response?.data || e?.message || t("adminUsersCreateFailed");
              toast(String(msg), "error");
            }
          }}
        >
          {t("adminUsersCreateUser")}
        </Button>
      </Box>

      <Box sx={{ mt: 2, display: "flex", flexDirection: "column", gap: 1 }}>
        {users.length === 0 ? (
          <Typography sx={{ color: "text.secondary" }}>{t("adminUsersNoUsers")}</Typography>
        ) : (
          users.map((u) => (
            <Box
              key={u.id}
              sx={{
                border: "1px solid rgba(15,23,42,0.08)",
                borderRadius: 2,
                p: 1.25,
                background: "rgba(255,255,255,0.6)",
                display: "flex",
                justifyContent: "space-between",
                alignItems: "center",
                gap: 2,
                flexWrap: "wrap",
              }}
            >
              <Box>
                <Typography sx={{ fontWeight: 900, lineHeight: 1.2 }}>
                  {u.userName || u.email || u.id}
                </Typography>
                <Typography variant="caption" sx={{ color: "text.secondary" }}>
                  {t("adminUsersRolesLabel")}: {u.roles?.length ? u.roles.join(", ") : "—"}
                </Typography>
              </Box>

              <Button
                variant="outlined"
                color="error"
                onClick={async () => {
                  if (!(await confirmAction(t("adminUsersDeleteConfirmBody"), { title: t("adminUsersDeleteConfirmTitle"), confirmLabel: t("adminUsersDelete"), destructive: true }))) return;
                  try {
                    await api.delete(`/users/${u.id}`);
                    toast(t("adminUsersDeleted"), "info");
                    await load();
                  } catch {
                    toast(t("adminUsersDeleteFailed"), "error");
                  }
                }}
              >
                {t("adminUsersDelete")}
              </Button>

              <Button
                variant="outlined"
                onClick={async () => {
                  try {
                    await api.post(`/users/${u.id}/send-password-reset`);
                    toast(t("adminUsersResetSent"), "success");
                  } catch (e: any) {
                    const msg = e?.response?.data || e?.message || t("adminUsersResetFailed");
                    toast(String(msg), "error");
                  }
                }}
              >
                {t("adminUsersSendReset")}
              </Button>
            </Box>
          ))
        )}
      </Box>
    </Paper>
  );
}