import { useState } from "react";
import { useQuery, useQueryClient } from "@tanstack/react-query";
import { motion, useReducedMotion } from "framer-motion";
import Box from "@mui/material/Box";
import Typography from "@mui/material/Typography";
import IconButton from "@mui/material/IconButton";
import CircularProgress from "@mui/material/CircularProgress";
import { useAlert } from "../../context/AlertContext";
import { Card, Button, StatusChip, ConfirmDialog } from "../../ui";
import apiFetch from "../../utils/api";
import { formatSessionDate } from "../../utils/dashboardHelpers";
import { sessionsOptions, type Session } from "../../lib/queries/dashboard";

const API_BASE = "/api/admin";

interface DeleteModalState {
  isOpen: boolean;
  session: Session | null;
}

function getDeviceIcon(iconType?: string) {
  switch (iconType) {
    case "smartphone":
      return (
        <svg
          width="18"
          height="18"
          viewBox="0 0 24 24"
          fill="none"
          stroke="currentColor"
          strokeWidth="2"
        >
          <rect x="5" y="2" width="14" height="20" rx="2" ry="2" />
          <line x1="12" y1="18" x2="12" y2="18" />
        </svg>
      );
    case "tablet":
      return (
        <svg
          width="18"
          height="18"
          viewBox="0 0 24 24"
          fill="none"
          stroke="currentColor"
          strokeWidth="2"
        >
          <rect x="4" y="2" width="16" height="20" rx="2" ry="2" />
          <line x1="12" y1="18" x2="12" y2="18" />
        </svg>
      );
    default:
      return (
        <svg
          width="18"
          height="18"
          viewBox="0 0 24 24"
          fill="none"
          stroke="currentColor"
          strokeWidth="2"
        >
          <rect x="2" y="3" width="20" height="14" rx="2" ry="2" />
          <line x1="8" y1="21" x2="16" y2="21" />
          <line x1="12" y1="17" x2="12" y2="21" />
        </svg>
      );
  }
}

export default function DashSessions() {
  const alert = useAlert();
  const queryClient = useQueryClient();
  const reduce = useReducedMotion();

  const { data: sessions = [], isPending: sessionsLoading } =
    useQuery(sessionsOptions());
  const [deleteModal, setDeleteModal] = useState<DeleteModalState>({
    isOpen: false,
    session: null,
  });
  const [deleteAllModal, setDeleteAllModal] = useState(false);
  const [deleting, setDeleting] = useState(false);

  const handleDeleteSession = async () => {
    if (!deleteModal.session) {
      return;
    }
    const sessionId = deleteModal.session.id;
    setDeleting(true);
    try {
      const response = await apiFetch(`${API_BASE}/sessions/${sessionId}`, {
        method: "DELETE",
      });
      const data = await response.json();
      if (data.success) {
        setDeleteModal({ isOpen: false, session: null });
        queryClient.invalidateQueries({ queryKey: ["sessions"] });
        alert.success("Relace byla ukončena");
      } else {
        alert.error(data.error || "Nepodařilo se ukončit relaci");
      }
    } catch {
      alert.error("Chyba připojení");
    } finally {
      setDeleting(false);
    }
  };

  const handleDeleteAllSessions = async () => {
    setDeleting(true);
    try {
      const response = await apiFetch(`${API_BASE}/sessions?action=all`, {
        method: "DELETE",
      });
      const data = await response.json();
      if (data.success) {
        setDeleteAllModal(false);
        queryClient.invalidateQueries({ queryKey: ["sessions"] });
        alert.success(data.message || "Ostatní relace byly ukončeny");
      } else {
        alert.error(data.error || "Nepodařilo se ukončit relace");
      }
    } catch {
      alert.error("Chyba připojení");
    } finally {
      setDeleting(false);
    }
  };

  return (
    <>
      <motion.div
        initial={reduce ? false : { opacity: 0, y: 12 }}
        animate={reduce ? undefined : { opacity: 1, y: 0 }}
        transition={{ duration: 0.25, delay: 0.15 }}
        style={{ height: "100%" }}
      >
        <Card sx={{ display: "flex", flexDirection: "column", height: "100%" }}>
          <Box
            sx={{
              display: "flex",
              alignItems: "center",
              justifyContent: "space-between",
              gap: 1.5,
              mb: 2,
            }}
          >
            <Typography variant="h6">Přihlášená zařízení</Typography>
            {sessions.filter((s) => !s.is_current).length > 0 && (
              <Button
                onClick={() => setDeleteAllModal(true)}
                variant="outlined"
                color="inherit"
                size="small"
                sx={{ flexShrink: 0 }}
              >
                Odhlásit ostatní
              </Button>
            )}
          </Box>

          {sessionsLoading ? (
            <Box sx={{ display: "flex", justifyContent: "center", py: 3 }}>
              <CircularProgress size={28} />
            </Box>
          ) : sessions.length === 0 ? (
            <Typography
              variant="body2"
              color="text.secondary"
              sx={{ textAlign: "center", py: 3 }}
            >
              Žádné aktivní relace
            </Typography>
          ) : (
            <Box sx={{ display: "flex", flexDirection: "column" }}>
              {sessions.map((session) => (
                <Box
                  key={session.id}
                  sx={{
                    display: "flex",
                    alignItems: "center",
                    gap: 1.5,
                    py: 1.25,
                    borderBottom: 1,
                    borderColor: "divider",
                    "&:last-of-type": { borderBottom: 0 },
                    ...(session.is_current
                      ? { bgcolor: "action.hover", borderRadius: 2, px: 1 }
                      : {}),
                  }}
                >
                  <Box
                    sx={{
                      display: "flex",
                      alignItems: "center",
                      justifyContent: "center",
                      color: "text.secondary",
                      flexShrink: 0,
                    }}
                  >
                    {getDeviceIcon(session.device_info?.icon)}
                  </Box>
                  <Box sx={{ flex: 1, minWidth: 0 }}>
                    <Box
                      sx={{
                        display: "flex",
                        alignItems: "center",
                        gap: 1,
                        flexWrap: "wrap",
                      }}
                    >
                      <Typography variant="body2" sx={{ fontWeight: 500 }}>
                        {session.device_info?.browser} na{" "}
                        {session.device_info?.os}
                      </Typography>
                      {session.is_current && (
                        <StatusChip color="success" label="Aktuální" />
                      )}
                    </Box>
                    <Box
                      sx={{
                        display: "flex",
                        alignItems: "center",
                        gap: 0.75,
                        color: "text.secondary",
                        fontSize: "0.75rem",
                      }}
                    >
                      <span>{session.ip_address}</span>
                      <span>|</span>
                      <span>{formatSessionDate(session.created_at)}</span>
                    </Box>
                  </Box>
                  <Box sx={{ flexShrink: 0 }}>
                    {!session.is_current && (
                      <IconButton
                        onClick={() =>
                          setDeleteModal({ isOpen: true, session })
                        }
                        color="error"
                        size="small"
                        title="Ukončit relaci"
                        aria-label="Ukončit relaci"
                      >
                        <svg
                          width="16"
                          height="16"
                          viewBox="0 0 24 24"
                          fill="none"
                          stroke="currentColor"
                          strokeWidth="2"
                        >
                          <path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4" />
                          <polyline points="16 17 21 12 16 7" />
                          <line x1="21" y1="12" x2="9" y2="12" />
                        </svg>
                      </IconButton>
                    )}
                  </Box>
                </Box>
              ))}
            </Box>
          )}
        </Card>
      </motion.div>

      <ConfirmDialog
        isOpen={deleteModal.isOpen}
        onClose={() => setDeleteModal({ isOpen: false, session: null })}
        onConfirm={handleDeleteSession}
        title="Ukončit relaci"
        message={`Opravdu chcete ukončit relaci na zařízení "${deleteModal.session?.device_info?.browser} na ${deleteModal.session?.device_info?.os}"? Toto zařízení bude odhlášeno.`}
        confirmText="Ukončit"
        cancelText="Zrušit"
        confirmVariant="danger"
        loading={deleting}
      />
      <ConfirmDialog
        isOpen={deleteAllModal}
        onClose={() => setDeleteAllModal(false)}
        onConfirm={handleDeleteAllSessions}
        title="Odhlásit ostatní zařízení"
        message="Opravdu chcete ukončit všechny ostatní relace? Budete odhlášeni ze všech zařízení kromě tohoto."
        confirmText="Odhlásit vše"
        cancelText="Zrušit"
        confirmVariant="primary"
        loading={deleting}
      />
    </>
  );
}
