import { useEffect, useState } from "react";
import axios from "axios";

export type BandOption = {
  id: number;
  name: string;
  order?: number | null;
  has_power_category?: boolean | null;
};

export type EdiCategoryOption = {
  id: number;
  value: string;
};

export type EdiBandOption = {
  id: number;
  value: string;
  bands?: { id: number; name: string }[];
};

type SelectedRoundLike = {
  id?: number | null;
  bands?: BandOption[];
} | null;

export const useRoundMeta = (roundId: number | null, selectedRound: SelectedRoundLike) => {
  const [bands, setBands] = useState<BandOption[]>([]);
  const [bandsError, setBandsError] = useState<string | null>(null);
  const [bandsLoading, setBandsLoading] = useState(false);
  const [ediCategories, setEdiCategories] = useState<EdiCategoryOption[]>([]);
  const [ediCategoriesError, setEdiCategoriesError] = useState<string | null>(null);
  const [ediCategoriesLoading, setEdiCategoriesLoading] = useState(false);
  const [ediBands, setEdiBands] = useState<EdiBandOption[]>([]);

  // načti dostupné bandy pro select PBand
  useEffect(() => {
    let active = true;
    (async () => {
      try {
        setBandsLoading(true);
        setBandsError(null);

        let bandList: BandOption[] = [];

        if (roundId && selectedRound?.id === roundId && Array.isArray(selectedRound.bands)) {
          bandList = selectedRound.bands as BandOption[];
        }

        if (roundId) {
          try {
            const roundRes = await axios.get<any>(`/api/rounds/${roundId}`, {
              headers: { Accept: "application/json" },
              withCredentials: true,
            });
            if (Array.isArray(roundRes.data?.bands) && roundRes.data.bands.length > 0) {
              bandList = roundRes.data.bands;
            }
          } catch {
            // fallback handled below
          }
        }

        if (!bandList.length) {
          const res = await axios.get<BandOption[] | { data: BandOption[] }>("/api/bands", {
            headers: { Accept: "application/json" },
            withCredentials: true,
          });
          bandList = Array.isArray(res.data) ? res.data : (res.data as any)?.data ?? [];
        }

        if (!active) return;
        const sorted = [...bandList].sort((a, b) => {
          const aOrder = a.order ?? 0;
          const bOrder = b.order ?? 0;
          if (aOrder !== bOrder) return aOrder - bOrder;
          return a.name.localeCompare(b.name);
        });
        setBands(sorted);
      } catch {
        if (!active) return;
        setBandsError("Nepodařilo se načíst seznam pásem.");
      } finally {
        if (active) setBandsLoading(false);
      }
    })();
    return () => {
      active = false;
    };
  }, [roundId, selectedRound]);

  // načti dostupné EDI kategorie pro validaci PSect
  useEffect(() => {
    let active = true;
    (async () => {
      try {
        setEdiCategoriesLoading(true);
        setEdiCategoriesError(null);
        const res = await axios.get<EdiCategoryOption[] | { data: EdiCategoryOption[] }>("/api/edi-categories", {
          headers: { Accept: "application/json" },
          withCredentials: true,
        });
        if (!active) return;
        const raw = Array.isArray(res.data) ? res.data : (res.data as any)?.data ?? [];
        const sorted = [...raw].sort((a, b) => a.value.localeCompare(b.value));
        setEdiCategories(sorted);
      } catch {
        if (!active) return;
        setEdiCategoriesError("Nepodařilo se načíst seznam kategorií.");
      } finally {
        if (active) setEdiCategoriesLoading(false);
      }
    })();
    return () => {
      active = false;
    };
  }, []);

  // načti EDI bandy pro mapování PBand -> Band
  useEffect(() => {
    let active = true;
    (async () => {
      try {
        const res = await axios.get<EdiBandOption[] | { data: EdiBandOption[] }>("/api/edi-bands", {
          headers: { Accept: "application/json" },
          withCredentials: true,
          params: { per_page: 500 },
        });
        if (!active) return;
        const raw = Array.isArray(res.data) ? res.data : (res.data as any)?.data ?? [];
        setEdiBands(raw);
      } catch {
        if (!active) return;
        // nechávám tiché selhání, mapování je nice-to-have
      }
    })();
    return () => {
      active = false;
    };
  }, []);

  return {
    bands,
    bandsError,
    bandsLoading,
    ediCategories,
    ediCategoriesError,
    ediCategoriesLoading,
    ediBands,
  };
};