import { cleanup, renderHook, waitFor } from "@testing-library/react";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import type { RouteResult } from "@watermaps/shared";
import { useRouteEventFeatures } from "../src/hooks/useRouteEventFeatures";

const apiMocks = vi.hoisted(() => ({
  getMapFeatures: vi.fn()
}));

vi.mock("../src/api", () => ({
  getMapFeatures: apiMocks.getMapFeatures
}));

beforeEach(() => {
  apiMocks.getMapFeatures.mockReset();
});

afterEach(cleanup);

describe("useRouteEventFeatures", () => {
  it("loads harbours, locks and bridges once and independently", async () => {
    apiMocks.getMapFeatures.mockImplementation(
      async ({ layers }: { layers: string[] }) =>
        featureCollection(layers[0]!)
    );

    const activeRoute = route("first", 0);
    const { result } = renderHook(() =>
      useRouteEventFeatures(activeRoute, { airDraftM: 3 })
    );

    await waitFor(() => expect(result.current.loading).toBe(false));

    expect(apiMocks.getMapFeatures).toHaveBeenCalledTimes(3);
    expect(
      apiMocks.getMapFeatures.mock.calls.map(([request]) => request.layers)
    ).toEqual(expect.arrayContaining([["harbours"], ["locks"], ["bridges"]]));
    expect(result.current.harbours.map((harbour) => harbour.name)).toEqual([
      "Testhafen"
    ]);
    expect(result.current.locks.map((lock) => lock.name)).toEqual([
      "Testschleuse"
    ]);
    expect(result.current.bridgeReport?.bridges.map((bridge) => bridge.name)).toEqual([
      "Testbrücke"
    ]);
    expect(result.current.error).toBeNull();
  });

  it("keeps working categories when one feature request fails", async () => {
    apiMocks.getMapFeatures.mockImplementation(
      async ({ layers }: { layers: string[] }) => {
        if (layers[0] === "harbours") {
          throw new Error("Feature-Datenbank fehlt");
        }
        return featureCollection(layers[0]!);
      }
    );

    const activeRoute = route("partial", 0);
    const { result } = renderHook(() =>
      useRouteEventFeatures(activeRoute, { airDraftM: 3 })
    );

    await waitFor(() => expect(result.current.loading).toBe(false));

    expect(result.current.harbours).toEqual([]);
    expect(result.current.locks).toHaveLength(1);
    expect(result.current.bridgeReport?.bridges).toHaveLength(1);
    expect(result.current.errors.harbours).toContain(
      "Häfen nicht erreichbar: Feature-Datenbank fehlt"
    );
    expect(result.current.errors.locks).toBeNull();
    expect(result.current.errors.bridges).toBeNull();
  });

  it("reassesses only bridges when the boat height changes", async () => {
    apiMocks.getMapFeatures.mockImplementation(
      async ({ layers }: { layers: string[] }) =>
        featureCollection(layers[0]!)
    );
    const activeRoute = route("height", 0);
    const { result, rerender } = renderHook(
      ({ airDraftM }) =>
        useRouteEventFeatures(activeRoute, { airDraftM }),
      { initialProps: { airDraftM: 3 } }
    );
    await waitFor(() => expect(result.current.loading).toBe(false));
    apiMocks.getMapFeatures.mockClear();

    rerender({ airDraftM: 3.5 });

    await waitFor(() => expect(result.current.loading).toBe(false));
    expect(apiMocks.getMapFeatures).toHaveBeenCalledTimes(1);
    expect(apiMocks.getMapFeatures).toHaveBeenCalledWith(
      expect.objectContaining({ layers: ["bridges"] })
    );
    expect(result.current.harbours).toHaveLength(1);
    expect(result.current.locks).toHaveLength(1);
    expect(result.current.bridgeReport?.requiredAirDraftM).toBe(3.5);
  });

  it("aborts stale category requests on a route change and exposes only the new route", async () => {
    const staleSignals: AbortSignal[] = [];
    const currentSignals: AbortSignal[] = [];
    let staleCalls = 0;
    apiMocks.getMapFeatures.mockImplementation(
      ({ layers, signal }: { layers: string[]; signal: AbortSignal }) => {
        if (staleCalls < 3) {
          staleCalls += 1;
          staleSignals.push(signal);
          return new Promise(() => undefined);
        }
        currentSignals.push(signal);
        return Promise.resolve(featureCollection(layers[0]!, 0.5));
      }
    );
    const firstRoute = route("first", 0);
    const secondRoute = route("second", 0.5);
    const { result, rerender, unmount } = renderHook(
      ({ activeRoute }) =>
        useRouteEventFeatures(activeRoute, { airDraftM: 3 }),
      { initialProps: { activeRoute: firstRoute } }
    );

    await waitFor(() => expect(apiMocks.getMapFeatures).toHaveBeenCalledTimes(3));
    rerender({ activeRoute: secondRoute });

    await waitFor(() => expect(result.current.loading).toBe(false));
    expect(apiMocks.getMapFeatures).toHaveBeenCalledTimes(6);
    expect(staleSignals).toHaveLength(3);
    expect(staleSignals.every((signal) => signal.aborted)).toBe(true);
    expect(result.current.harbours[0]?.coordinate.lon).toBeCloseTo(0.7);
    expect(result.current.locks[0]?.coordinate.lon).toBeCloseTo(0.8);
    expect(result.current.bridgeReport?.bridges[0]?.coordinate.lon).toBeCloseTo(0.9);

    unmount();
    expect(currentSignals).toHaveLength(3);
    expect(currentSignals.every((signal) => signal.aborted)).toBe(true);
  });
});

function featureCollection(layer: string, offset = 0) {
  const fixtures = {
    harbours: {
      type: "Feature" as const,
      id: `harbour-${offset}`,
      properties: { layer: "harbours", name: "Testhafen" },
      geometry: {
        type: "Point" as const,
        coordinates: [0.2 + offset, 0]
      }
    },
    locks: {
      type: "Feature" as const,
      id: `lock-${offset}`,
      properties: { layer: "locks", name: "Testschleuse" },
      geometry: {
        type: "Point" as const,
        coordinates: [0.3 + offset, 0]
      }
    },
    bridges: {
      type: "Feature" as const,
      id: `bridge-${offset}`,
      properties: {
        layer: "bridges",
        name: "Testbrücke",
        clearance_m: 4
      },
      geometry: {
        type: "Point" as const,
        coordinates: [0.4 + offset, 0]
      }
    }
  };
  return {
    type: "FeatureCollection" as const,
    features: [fixtures[layer as keyof typeof fixtures]]
  };
}

function route(id: string, offset: number): RouteResult {
  return {
    id,
    geometry: {
      type: "LineString",
      coordinates: [
        [offset, 0],
        [offset + 1, 0]
      ]
    },
    distanceNm: 60,
    eta: null,
    warnings: [],
    dataSources: ["test"],
    routingMode: "fairway"
  };
}