"use client";

import { useState } from "react";
import {
  Box,
  Card,
  CardContent,
  Typography,
  IconButton,
  Alert,
  CircularProgress,
} from "@mui/material";
import MoreVertIcon from "@mui/icons-material/MoreVert";
import CalendarTodayIcon from "@mui/icons-material/CalendarToday";
import { Range } from "react-date-range";

import { DateRangePicker } from "../DateRangePicker/DateRangePicker";
import { StatItem } from "./components/StatItem";
import { DEFAULT_DATE_RANGE } from "./constants";
import { IHealthData } from "@/app/services/health";
import { useDebouncedDateRange } from "@/app/hooks/useDebouncedDateRange";
import { dashboardService } from "@/app/services/dashboardService";
import { normalizeDateRangeForAPI } from "@/app/utils/formatDate";

import "./GeneralHealthCard.scss";

interface IGeneralHealthCardProps {
  initialHealthData?: IHealthData | null;
  initialStats?: Array<{
    label: string;
    value: string | number;
    change: string;
  }> | null;
  initialDateRange?: Range[];
}

const DEBOUNCE_MS = 1000;

export const GeneralHealthCard = ({
  initialHealthData = null,
  initialStats = null,
  initialDateRange,
}: IGeneralHealthCardProps) => {
  const [healthData, setHealthData] = useState<IHealthData | null>(
    initialHealthData
  );
  const [error, setError] = useState<string | null>(null);
  const [isLoading, setIsLoading] = useState(false);

  /**
   * Fetch health data for a given range
   */
  const fetchHealthData = async (range: Range[]) => {
    if (!range || !range[0]) return;

    const startDate = range[0]?.startDate;
    const endDate = range[0]?.endDate;

    if (!startDate || !endDate) return;

    setError(null);
    setIsLoading(true);

    try {
      // Normalize dates to ensure full day coverage
      const { dateStart, dateEnd } = normalizeDateRangeForAPI(
        startDate,
        endDate
      );

      // This will update the service and notify all subscribers
      const { healthData } = await dashboardService.fetchDashboardData({
        dateStart,
        dateEnd,
      });

      setHealthData(healthData);
    } catch (err) {
      const message =
        err instanceof Error ? err.message : "Failed to fetch health data";
      setError(message);
      setHealthData(null);
    } finally {
      setIsLoading(false);
    }
  };

  const { dateRange, handleDateRangeChange } = useDebouncedDateRange({
    initialDateRange: initialDateRange ?? DEFAULT_DATE_RANGE,
    debounceMs: DEBOUNCE_MS,
    onDateRangeChange: fetchHealthData,
    skipInitialFetch: !!initialHealthData,
  });

  /**
   * Resolve stats source
   */
  const stats = healthData?.stats ??
    initialStats ?? [
      { label: "TOTAL", value: 0, change: "0%" },
      { label: "SUCCESSFUL", value: 0, change: "0%" },
      { label: "ACCEPTANCE RATE", value: "0%", change: "0%" },
      { label: "AMOUNT", value: "€0.00", change: "0%" },
      { label: "ATV", value: "€0.00", change: "0%" },
    ];

  return (
    <Card className="general-health-card">
      <CardContent>
        <Box className="general-health-card__header">
          <Typography variant="h5" fontWeight="bold">
            General Health
          </Typography>

          <Box className="general-health-card__right-side">
            <CalendarTodayIcon fontSize="small" />
            <Typography variant="body2">
              <DateRangePicker
                value={dateRange}
                onChange={handleDateRangeChange}
              />
            </Typography>
            <IconButton size="small">
              <MoreVertIcon fontSize="small" />
            </IconButton>
          </Box>
        </Box>

        {error && (
          <Alert severity="error" sx={{ mb: 2 }}>
            {error}
          </Alert>
        )}

        {isLoading ? (
          <Box
            sx={{
              display: "flex",
              justifyContent: "center",
              alignItems: "center",
              minHeight: 100,
            }}
          >
            <CircularProgress />
          </Box>
        ) : (
          !error && (
            <Box className="general-health-card__stat-items">
              {stats.map((item, i) => (
                <StatItem key={`${item.label}-${i}`} {...item} />
              ))}
            </Box>
          )
        )}
      </CardContent>
    </Card>
  );
};