import React, { useState } from 'react'
import {
  AppBar,
  Box,
  CssBaseline,
  Drawer,
  IconButton,
  List,
  ListItem,
  ListItemButton,
  ListItemIcon,
  ListItemText,
  Toolbar,
  Typography,
  useTheme,
  LinearProgress,
  Button,
} from '@mui/material'
import {
  Menu as MenuIcon,
  Dashboard as DashboardIcon,
  Add as AddIcon,
  Settings as SettingsIcon,
} from '@mui/icons-material'
import { Link } from 'react-router'

const drawerWidth = 240

interface LayoutProps {
  children: React.ReactNode
  loading?: boolean
}

export default function Layout({ children, loading = false }: LayoutProps) {
  const theme = useTheme()
  const [mobileOpen, setMobileOpen] = useState(false)

  const handleDrawerToggle = () => {
    setMobileOpen(!mobileOpen)
  }

  const menuItems = [
    {
      text: 'Tasks',
      icon: <DashboardIcon />,
      path: '/',
    },
    {
      text: 'Settings',
      icon: <SettingsIcon />,
      path: '/settings',
    },
  ]

  const drawer = (
    <div>
      <List sx={{ pt: 2 }}>
        {menuItems.map(item => (
          <ListItem key={item.text} disablePadding>
            <ListItemButton
              component="a"
              href={item.path}
              sx={{
                borderRadius: 2,
                mx: 1,
                my: 0.5,
                '&:hover': {
                  backgroundColor: theme.palette.primary.main + '10',
                },
              }}
            >
              <ListItemIcon sx={{ color: theme.palette.primary.main }}>
                {item.icon}
              </ListItemIcon>
              <ListItemText
                primary={item.text}
                primaryTypographyProps={{
                  fontWeight: 500,
                }}
              />
            </ListItemButton>
          </ListItem>
        ))}
      </List>
    </div>
  )

  return (
    <Box sx={{ display: 'flex' }}>
      <CssBaseline />

      {/* Loading indicator */}
      {loading && (
        <LinearProgress
          sx={{
            position: 'fixed',
            top: 0,
            left: 0,
            right: 0,
            zIndex: theme.zIndex.appBar + 1,
          }}
        />
      )}

      {/* App Bar */}
      <AppBar
        position="fixed"
        sx={{
          width: '100%',
          backgroundColor: theme.palette.primary.main,
          color: theme.palette.primary.contrastText,
          zIndex: theme.zIndex.drawer + 1,
        }}
      >
        <Toolbar>
          <IconButton
            color="inherit"
            aria-label="open drawer"
            edge="start"
            onClick={handleDrawerToggle}
            sx={{ mr: 2, display: { md: 'none' } }}
          >
            <MenuIcon />
          </IconButton>

          <Typography
            variant="h6"
            noWrap
            component="div"
            sx={{
              flexGrow: 1,
              color: '#ffffff',
              fontWeight: 700,
              display: 'flex',
              alignItems: 'center',
              gap: 1,
            }}
          >
            ⚓ Captain's Log
          </Typography>

          <Button
            component={Link}
            to="/task/new"
            variant="contained"
            startIcon={<AddIcon />}
            sx={{
              backgroundColor: theme.palette.secondary.main,
              color: theme.palette.secondary.contrastText,
              '&:hover': {
                backgroundColor: theme.palette.secondary.dark || '#b7791f',
              },
              fontWeight: 600,
              fontSize: '1rem',
              px: 2,
              py: 1.5,
              minWidth: 'auto',
              height: '44px',
            }}
          >
            New Task
          </Button>
        </Toolbar>
      </AppBar>

      {/* Drawer */}
      <Box
        component="nav"
        sx={{ width: { md: drawerWidth }, flexShrink: { md: 0 } }}
        aria-label="navigation menu"
      >
        {/* Mobile drawer */}
        <Drawer
          variant="temporary"
          open={mobileOpen}
          onClose={handleDrawerToggle}
          ModalProps={{
            keepMounted: true, // Better open performance on mobile.
          }}
          sx={{
            display: { xs: 'block', md: 'none' },
            '& .MuiDrawer-paper': {
              boxSizing: 'border-box',
              width: drawerWidth,
            },
          }}
        >
          {drawer}
        </Drawer>

        {/* Desktop drawer */}
        <Drawer
          variant="permanent"
          sx={{
            display: { xs: 'none', md: 'block' },
            '& .MuiDrawer-paper': {
              boxSizing: 'border-box',
              width: drawerWidth,
              top: '64px', // Position below AppBar
              height: 'calc(100% - 64px)', // Adjust height to account for AppBar
            },
          }}
          open
        >
          {drawer}
        </Drawer>
      </Box>

      {/* Main content */}
      <Box
        component="main"
        sx={{
          flexGrow: 1,
          p: 3,
          width: { md: `calc(100% - ${drawerWidth}px)` },
          minHeight: '100vh',
          backgroundColor: theme.palette.background.default,
        }}
      >
        <Toolbar />
        {children}
      </Box>

    </Box>
  )
}