"use client";

import { useEffect, useState, useCallback } from "react";
import { Permission } from "../../auth-context";
import { adminApi } from "../../api";
import { sharedStyles } from "../../styles/shared";
import { Header } from "../../components/Header";
import { useRequireAuth } from "../../hooks/useRequireAuth";
import { components } from "../../generated/api";

type PriceHistoryRecord = components["schemas"]["PriceHistoryResponse"];

export default function AdminPriceHistoryPage() {
  const [records, setRecords] = useState<PriceHistoryRecord[]>([]);
  const [error, setError] = useState<string | null>(null);
  const [isLoadingData, setIsLoadingData] = useState(true);
  const [isFetching, setIsFetching] = useState(false);
  const { user, isLoading, isAuthorized } = useRequireAuth({
    requiredPermission: Permission.VIEW_AUDIT,
    fallbackRedirect: "/",
  });

  const fetchRecords = useCallback(async () => {
    setError(null);
    setIsLoadingData(true);
    try {
      const data = await adminApi.getPriceHistory();
      setRecords(data);
    } catch (err) {
      setRecords([]);
      setError(err instanceof Error ? err.message : "Failed to load price history");
    } finally {
      setIsLoadingData(false);
    }
  }, []);

  const handleFetchNow = async () => {
    setIsFetching(true);
    setError(null);
    try {
      await adminApi.fetchPrice();
      await fetchRecords();
    } catch (err) {
      setError(err instanceof Error ? err.message : "Failed to fetch price");
    } finally {
      setIsFetching(false);
    }
  };

  useEffect(() => {
    if (user && isAuthorized) {
      fetchRecords();
    }
  }, [user, isAuthorized, fetchRecords]);

  const formatDate = (dateStr: string) => {
    return new Date(dateStr).toLocaleString();
  };

  const formatPrice = (price: number) => {
    return new Intl.NumberFormat("en-US", {
      style: "currency",
      currency: "EUR",
      minimumFractionDigits: 2,
      maximumFractionDigits: 2,
    }).format(price);
  };

  if (isLoading) {
    return (
      <main style={styles.main}>
        <div style={styles.loader}>Loading...</div>
      </main>
    );
  }

  if (!user || !isAuthorized) {
    return null;
  }

  return (
    <main style={styles.main}>
      <Header currentPage="admin-price-history" />

      <div style={styles.content}>
        <div style={styles.tableCard}>
          <div style={styles.tableHeader}>
            <h2 style={styles.tableTitle}>Bitcoin Price History</h2>
            <div style={styles.headerActions}>
              <span style={styles.totalCount}>{records.length} records</span>
              <button onClick={fetchRecords} style={styles.refreshBtn} disabled={isLoadingData}>
                Refresh
              </button>
              <button onClick={handleFetchNow} style={styles.fetchBtn} disabled={isFetching}>
                {isFetching ? "Fetching..." : "Fetch Now"}
              </button>
            </div>
          </div>

          <div style={styles.tableWrapper}>
            <table style={styles.table}>
              <thead>
                <tr>
                  <th style={styles.th}>Source</th>
                  <th style={styles.th}>Pair</th>
                  <th style={styles.th}>Price</th>
                  <th style={styles.th}>Timestamp</th>
                </tr>
              </thead>
              <tbody>
                {error && (
                  <tr>
                    <td colSpan={4} style={styles.errorRow}>
                      {error}
                    </td>
                  </tr>
                )}
                {!error && isLoadingData && (
                  <tr>
                    <td colSpan={4} style={styles.emptyRow}>
                      Loading...
                    </td>
                  </tr>
                )}
                {!error && !isLoadingData && records.length === 0 && (
                  <tr>
                    <td colSpan={4} style={styles.emptyRow}>
                      No price records yet. Click &quot;Fetch Now&quot; to get the current price.
                    </td>
                  </tr>
                )}
                {!error &&
                  !isLoadingData &&
                  records.map((record) => (
                    <tr key={record.id} style={styles.tr}>
                      <td style={styles.td}>{record.source}</td>
                      <td style={styles.td}>{record.pair}</td>
                      <td style={styles.tdPrice}>{formatPrice(record.price)}</td>
                      <td style={styles.tdDate}>{formatDate(record.timestamp)}</td>
                    </tr>
                  ))}
              </tbody>
            </table>
          </div>
        </div>
      </div>
    </main>
  );
}

const pageStyles: Record<string, React.CSSProperties> = {
  content: {
    flex: 1,
    padding: "2rem",
    overflowY: "auto",
  },
  tableCard: {
    background: "rgba(255, 255, 255, 0.03)",
    backdropFilter: "blur(10px)",
    border: "1px solid rgba(255, 255, 255, 0.08)",
    borderRadius: "20px",
    padding: "1.5rem",
    boxShadow: "0 25px 50px -12px rgba(0, 0, 0, 0.5)",
    maxWidth: "900px",
    margin: "0 auto",
  },
  tableHeader: {
    display: "flex",
    justifyContent: "space-between",
    alignItems: "center",
    marginBottom: "1rem",
    flexWrap: "wrap",
    gap: "1rem",
  },
  tableTitle: {
    fontFamily: "'Instrument Serif', Georgia, serif",
    fontSize: "1.5rem",
    fontWeight: 400,
    color: "#fff",
    margin: 0,
  },
  headerActions: {
    display: "flex",
    alignItems: "center",
    gap: "1rem",
  },
  totalCount: {
    fontFamily: "'DM Sans', system-ui, sans-serif",
    fontSize: "0.875rem",
    color: "rgba(255, 255, 255, 0.4)",
  },
  refreshBtn: {
    fontFamily: "'DM Sans', system-ui, sans-serif",
    fontSize: "0.875rem",
    padding: "0.5rem 1rem",
    background: "rgba(255, 255, 255, 0.08)",
    border: "1px solid rgba(255, 255, 255, 0.15)",
    borderRadius: "8px",
    color: "rgba(255, 255, 255, 0.8)",
    cursor: "pointer",
  },
  fetchBtn: {
    fontFamily: "'DM Sans', system-ui, sans-serif",
    fontSize: "0.875rem",
    padding: "0.5rem 1rem",
    background: "linear-gradient(135deg, #a78bfa, #8b5cf6)",
    border: "none",
    borderRadius: "8px",
    color: "#fff",
    cursor: "pointer",
    fontWeight: 500,
  },
  tableWrapper: {
    overflowX: "auto",
  },
  table: {
    width: "100%",
    borderCollapse: "collapse",
    fontFamily: "'DM Sans', system-ui, sans-serif",
  },
  th: {
    textAlign: "left",
    padding: "0.75rem 1rem",
    fontSize: "0.75rem",
    fontWeight: 600,
    color: "rgba(255, 255, 255, 0.4)",
    textTransform: "uppercase",
    letterSpacing: "0.05em",
    borderBottom: "1px solid rgba(255, 255, 255, 0.08)",
  },
  tr: {
    borderBottom: "1px solid rgba(255, 255, 255, 0.04)",
  },
  td: {
    padding: "0.875rem 1rem",
    fontSize: "0.875rem",
    color: "rgba(255, 255, 255, 0.7)",
  },
  tdPrice: {
    padding: "0.875rem 1rem",
    fontSize: "1rem",
    color: "#fbbf24",
    fontWeight: 600,
    fontFamily: "'DM Mono', monospace",
  },
  tdDate: {
    padding: "0.875rem 1rem",
    fontSize: "0.75rem",
    color: "rgba(255, 255, 255, 0.4)",
  },
  emptyRow: {
    padding: "2rem 1rem",
    textAlign: "center",
    color: "rgba(255, 255, 255, 0.3)",
    fontSize: "0.875rem",
  },
  errorRow: {
    padding: "2rem 1rem",
    textAlign: "center",
    color: "#f87171",
    fontSize: "0.875rem",
  },
};

const styles = { ...sharedStyles, ...pageStyles };