import * as React from "react";
import {
  Box,
  Container,
  CircularProgress,
  Alert,
  TextField,
  Paper,
  Autocomplete,
  Button
} from "@mui/material";

import ConfigurableDashboard from "./components/Dashboard";
import { DashboardState } from "./components/Dashboard";
import { configuration } from "./dashboard-config";
import {
  useReport,
  prepareReport,
} from "./features/report";

export default function Dashboard() {
  const [flow, setFlow] = React.useState<"outflows" | "inflows">("outflows");

  const [appliedPayees, setAppliedPayees] = React.useState<string[]>([]);
  const [appliedTags, setAppliedTags] = React.useState<string[]>([]);

  const [payeeInput, setPayeeInput] = React.useState<string[]>([]);
  const [tagsInput, setTagsInput] = React.useState<string[]>([]);

  const [loadedPayees, setLoadedPayees] = React.useState<string[]>([]);
  const [loadedTags, setLoadedTags] = React.useState<string[]>([]);

  const report = useReport({
    periods: ["daily", "weekly", "monthly", "all"],
    flow: flow,
    payee: appliedPayees.length > 0 ? appliedPayees : undefined,
    tags: appliedTags.length > 0 ? appliedTags : undefined,
  });

  React.useEffect(() => {
    if (report.data?.data) {
      setLoadedPayees(prev => {
        const pSet = new Set<string>(prev);
        report.data.data.buckets.forEach((b: any) => {
          Object.values(b.periods).forEach((periodArray: any) => {
            periodArray?.forEach((p: any) => {
              p.metric?.transactions?.forEach((t: any) => {
                if (t.payee?.name) pSet.add(t.payee.name);
              });
            });
          });
        });
        return Array.from(pSet).sort();
      });

      setLoadedTags(prev => {
        const tSet = new Set<string>(prev);
        report.data.data.buckets.forEach((b: any) => {
          Object.values(b.periods).forEach((periodArray: any) => {
            periodArray?.forEach((p: any) => {
              p.metric?.transactions?.forEach((t: any) => {
                t.tags?.forEach((tag: any) => tSet.add(tag.name || tag));
              });
            });
          });
        });
        return Array.from(tSet).sort();
      });
    }
  }, [report.data?.data]);

  const isLoading = report.isLoading;
  const error = report.error;

  /** Callback for the ConfigurableDashboard's flow toggle */
  const handleFlowChange = React.useCallback((newState: DashboardState) => {
    setFlow(newState.flow);
  }, []);

  if (isLoading && !report.data) {
    return (
      <Box sx={{ display: "flex", justifyContent: "center", alignItems: "center", height: "60vh" }}>
        <CircularProgress />
      </Box>
    );
  }

  if (error) {
    return (
      <Container sx={{ mt: 4 }}>
        <Alert severity="error">{String(error)}</Alert>
      </Container>
    );
  }

  if (!report.data) {
    return null;
  }

  const data = prepareReport(report.data.data);
  return (
    <Box>
      <Container>
        <Paper 
          sx={{ 
            mt: 4, 
            p: 2, 
            display: "flex", 
            flexDirection: { xs: "column", sm: "row" },
            gap: 2, 
            alignItems: { xs: "stretch", sm: "flex-end" }, 
            borderRadius: 4,
            mb: -2 // pull up to be closer to the dashboard container below
          }} 
          elevation={0} 
          variant="outlined"
        >
          <Box sx={{ display: 'flex', flexDirection: 'column', flex: 1, minWidth: { sm: 250 } }}>
            <Box sx={{ typography: 'caption', mb: 1, color: 'text.secondary' }}>
              Filter by Payee
            </Box>
            <Autocomplete
              multiple
              freeSolo
              options={loadedPayees}
              value={payeeInput}
              onChange={(_, val) => setPayeeInput(val as string[])}
              renderInput={(params) => <TextField {...params} placeholder="Add payees..." />}
              sx={{ '& .MuiOutlinedInput-root': { height: 'auto', minHeight: '2.5rem', py: 0.5 } }}
            />
          </Box>
          <Box sx={{ display: 'flex', flexDirection: 'column', flex: 1, minWidth: { sm: 250 } }}>
            <Box sx={{ typography: 'caption', mb: 1, color: 'text.secondary' }}>
              Filter by Tags
            </Box>
            <Autocomplete
              multiple
              freeSolo
              options={loadedTags}
              value={tagsInput}
              onChange={(_, val) => setTagsInput(val as string[])}
              renderInput={(params) => <TextField {...params} placeholder="Add tags..." />}
              sx={{ '& .MuiOutlinedInput-root': { height: 'auto', minHeight: '2.5rem', py: 0.5 } }}
            />
          </Box>
          <Button 
            variant="contained" 
            size="large"
            onClick={() => {
              setAppliedPayees(payeeInput);
              setAppliedTags(tagsInput);
            }}
            disabled={isLoading}
            sx={{ height: 40, borderRadius: 2 }}
          >
            Apply
          </Button>
        </Paper>
      </Container>
      <ConfigurableDashboard
        config={configuration}
        data={data}
        isFetching={report.isFetching}
        onFlowChange={handleFlowChange}
      />
    </Box>
  );
}