import { useState } from "react";
import { useNavigate } from "react-router";
import LogoutOutlinedIcon from "@mui/icons-material/LogoutOutlined";
import SettingsOutlinedIcon from "@mui/icons-material/SettingsOutlined";
import {
  AppBar,
  Box,
  Divider,
  ListItemIcon,
  ListItemText,
  Menu,
  MenuItem,
  Toolbar,
  Typography,
} from "@mui/material";
import { ChevronDown, Menu as MenuIcon } from "lucide-react";

import { useAuthContext } from "@/providers/auth-context";
import { getPrimaryUserRole } from "@/lib/auth/user-utils";

type AppTopbarProps = {
  onToggleNav: () => void;
};

export function AppTopbar({ onToggleNav }: AppTopbarProps) {
  const navigate = useNavigate();
  const { user, logout } = useAuthContext();

  const [userAnchor, setUserAnchor] = useState<null | HTMLElement>(null);

  const handleLogout = () => {
    setUserAnchor(null);
    logout();
  };

  const userInitials = user?.fullname
    ? user.fullname
        .split(" ")
        .map((part) => part[0])
        .join("")
        .slice(0, 2)
        .toUpperCase()
    : "U";

  const userRole = getPrimaryUserRole(user?.userRoles);

  return (
    <AppBar
      position="sticky"
      elevation={0}
      square
      sx={{
        height: "var(--spacing-topbar)",
        background: "var(--color-header-gradient)",
        boxShadow: "none",
        color: "var(--color-header-text)",
        borderRadius: 0,
      }}
    >
      <Toolbar
        disableGutters
        className="flex items-center"
        sx={{
          minHeight: "var(--spacing-topbar) !important",
          height: "var(--spacing-topbar)",
          gap: "18px",
          px: "16px",
          pr: "22px",
        }}
      >
        <Box
          component="button"
          type="button"
          onClick={onToggleNav}
          aria-label="Toggle navigation"
          title="Toggle sidebar"
          sx={{
            display: "flex",
            alignItems: "center",
            justifyContent: "center",
            flexShrink: 0,
            width: 38,
            height: 38,
            borderRadius: "6px",
            border: "none",
            cursor: "pointer",
            backgroundColor: "var(--color-header-surface)",
            color: "var(--color-header-icon)",
            transition: "background-color var(--duration-fast, 150ms) var(--ease-default, ease)",
            "&:hover": {
              backgroundColor: "var(--color-header-surface-hover)",
            },
          }}
        >
          <MenuIcon size={18} />
        </Box>

        <Box sx={{ flex: 1 }} />

        <Box
          component="button"
          type="button"
          aria-haspopup="true"
          aria-expanded={Boolean(userAnchor)}
          onClick={(event) => setUserAnchor(event.currentTarget)}
          sx={{
            display: "flex",
            alignItems: "center",
            flexShrink: 0,
            gap: "10px",
            py: "5px",
            pl: "6px",
            pr: "10px",
            borderRadius: "9999px",
            border: "none",
            cursor: "pointer",
            backgroundColor: "transparent",
            color: "var(--color-header-text)",
            transition: "background-color var(--duration-fast, 150ms) var(--ease-default, ease)",
            "&:hover": {
              backgroundColor: "var(--color-header-chip-hover)",
            },
          }}
        >
          <Box
            className="flex shrink-0 items-center justify-center"
            sx={{
              width: 34,
              height: 34,
              borderRadius: "50%",
              background: "linear-gradient(135deg, var(--accent), var(--primary))",
              boxShadow: "0 0 0 2px var(--color-header-avatar-ring)",
              fontFamily: "var(--font-display)",
              fontSize: 12,
              fontWeight: 700,
              color: "#ffffff",
            }}
          >
            {userInitials}
          </Box>
          <Box className="text-left leading-tight">
            <Typography
              component="p"
              sx={{
                fontFamily: "var(--font-sans)",
                fontSize: 13,
                fontWeight: 600,
                color: "#ffffff",
                lineHeight: 1.25,
              }}
            >
              {user?.fullname || "User"}
            </Typography>
            <Typography
              component="p"
              sx={{
                fontSize: 11,
                color: "var(--color-header-text-muted)",
                lineHeight: 1.25,
              }}
            >
              {userRole}
            </Typography>
          </Box>
          <ChevronDown
            size={15}
            className="shrink-0"
            style={{ color: "var(--color-header-text-muted)" }}
          />
        </Box>
      </Toolbar>

      <Menu
        anchorEl={userAnchor}
        open={Boolean(userAnchor)}
        onClose={() => setUserAnchor(null)}
        transformOrigin={{ horizontal: "right", vertical: "top" }}
        anchorOrigin={{ horizontal: "right", vertical: "bottom" }}
        slotProps={{
          paper: {
            sx: { width: 260, mt: 1, boxShadow: "var(--shadow-lg)" },
          },
        }}
      >
        <Box className="flex items-center gap-3 px-4 py-3">
          <Box
            className="flex shrink-0 items-center justify-center"
            sx={{
              width: 40,
              height: 40,
              borderRadius: "50%",
              background: "linear-gradient(135deg, var(--accent), var(--primary))",
              fontSize: "0.875rem",
              fontWeight: 600,
              color: "#ffffff",
              border: "2px solid var(--color-header-avatar-ring)",
            }}
          >
            {userInitials}
          </Box>
          <Box>
            <Typography variant="body2" sx={{ fontWeight: 600 }}>
              {user?.fullname || "User"}
            </Typography>
            <Typography variant="caption" color="text.secondary">
              {user?.email || ""}
            </Typography>
          </Box>
        </Box>
        <Divider />
        <MenuItem
          onClick={() => {
            setUserAnchor(null);
            navigate("/settings/dropdowns");
          }}
        >
          <ListItemIcon>
            <SettingsOutlinedIcon fontSize="small" />
          </ListItemIcon>
          <ListItemText>Settings</ListItemText>
        </MenuItem>
        <MenuItem onClick={handleLogout} sx={{ color: "error.main" }}>
          <ListItemIcon>
            <LogoutOutlinedIcon fontSize="small" color="error" />
          </ListItemIcon>
          <ListItemText>Logout</ListItemText>
        </MenuItem>
      </Menu>
    </AppBar>
  );
}