import { describe, expect, it } from "vitest";
import { mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { buildRoute, haversineDistanceNm } from "@watermaps/shared";
import { createCache } from "../src/services/cache.js";
import {
  FairwayService,
  fairwayRowsToGraph,
  localFairwaysToGraph,
  mergeConnectedFairwayGraphs,
  overpassToGraph
} from "../src/services/fairways.js";

const EMDEN_CANAL_REGRESSION_WAYS: Parameters<typeof localFairwaysToGraph>[0] = [
  {
    id: "28021006-tail",
    bbox: [7.4498965, 53.4492034, 7.4512561, 53.4500483],
    tags: { name: "Ems-Jade-Kanal", width: "8", waterway: "canal" },
    coordinates: [
      [53.4492034, 7.4498965],
      [53.4495624, 7.4505731],
      [53.4499672, 7.4511607],
      [53.4499875, 7.4511887],
      [53.4500483, 7.4512561]
    ]
  },
  {
    id: "278807710",
    bbox: [7.4512561, 53.4500483, 7.4518959, 53.4504899],
    tags: {
      lock: "yes",
      name: "Ems-Jade-Kanal",
      width: "8",
      waterway: "canal"
    },
    coordinates: [
      [53.4500483, 7.4512561],
      [53.4502057, 7.4514971],
      [53.4504899, 7.4518959]
    ]
  },
  {
    id: "278807709",
    bbox: [7.4518959, 53.4449969, 7.5736929, 53.4650304],
    tags: { name: "Ems-Jade-Kanal", width: "8", waterway: "canal" },
    coordinates: [
      [53.4504899, 7.4518959],
      [53.4505236, 7.4519531],
      [53.4509222, 7.4525426],
      [53.4516529, 7.453623],
      [53.4584592, 7.463384],
      [53.4595046, 7.4648841],
      [53.4599438, 7.465618],
      [53.460753, 7.4673133],
      [53.4616984, 7.46945],
      [53.4620622, 7.4701175],
      [53.4625348, 7.4707952],
      [53.4627636, 7.4711325],
      [53.4629466, 7.4713664],
      [53.4630916, 7.4715145],
      [53.4632388, 7.4716743],
      [53.4633943, 7.4717923],
      [53.4636131, 7.4718959],
      [53.4639548, 7.4720761],
      [53.4642607, 7.4722805],
      [53.4646149, 7.4724784],
      [53.4647858, 7.472612],
      [53.4650071, 7.4729838],
      [53.4650304, 7.4733641],
      [53.4649736, 7.4737867],
      [53.4645791, 7.4743077],
      [53.4642518, 7.4745346],
      [53.4640847, 7.4746604],
      [53.4624017, 7.4759267],
      [53.4618827, 7.4763916],
      [53.4602632, 7.479245],
      [53.4587935, 7.4819111],
      [53.4585086, 7.482532],
      [53.4583429, 7.482893],
      [53.4570519, 7.4861185],
      [53.455688, 7.4897057],
      [53.4554283, 7.4910088],
      [53.4543892, 7.4963485],
      [53.4532243, 7.5021539],
      [53.4531102, 7.5027225],
      [53.4520897, 7.5077114],
      [53.4519492, 7.5083984],
      [53.4508683, 7.5126327],
      [53.4490515, 7.5208022],
      [53.4489869, 7.5211006],
      [53.4485124, 7.5232942],
      [53.4466401, 7.5319367],
      [53.4451989, 7.5385911],
      [53.4450014, 7.5399242],
      [53.4449969, 7.5406774],
      [53.4456267, 7.5463127],
      [53.4457299, 7.5470025],
      [53.446674, 7.5509229],
      [53.4477404, 7.55515],
      [53.4478348, 7.5554891],
      [53.4491825, 7.5603283],
      [53.4525244, 7.5722942],
      [53.4529207, 7.5736929]
    ]
  }
];

describe("fairway graph extraction", () => {
  it("reports that no routing source is configured", async () => {
    const service = new FairwayService({
      cache: createCache(),
      fetcher: fetch,
      liveEnabled: false
    });

    const lookup = await service.getGraphsForRoute({
      start: { lat: 53.4498, lon: 7.4509 },
      destination: { lat: 53.4646, lon: 7.4742 },
      vesselProfile: { draughtM: 1.4, safetyReserveM: 0.5 }
    });

    expect(lookup.graphs).toEqual([]);
    expect(lookup.failures).toMatchObject([
      {
        source: "configuration",
        error: expect.objectContaining({ message: "No fairway source is configured" })
      }
    ]);
    await service.close();
  });

  it("retries a configured local routing index after a missing file is repaired", async () => {
    const temporaryDirectory = await mkdtemp(join(tmpdir(), "watermaps-missing-index-"));
    const localDataPath = join(temporaryDirectory, "missing-fairways.json");
    const service = new FairwayService({
      cache: createCache(),
      fetcher: fetch,
      liveEnabled: false,
      localDataPath
    });
    const request = {
      start: { lat: 53.4498, lon: 7.4509 },
      destination: { lat: 53.4646, lon: 7.4742 },
      vesselProfile: { draughtM: 1.4, safetyReserveM: 0.5 }
    };

    try {
      const missingLookup = await service.getGraphsForRoute(request);
      expect(missingLookup.graphs).toEqual([]);
      expect(missingLookup.failures).toMatchObject([
        {
          source: "local",
          error: expect.objectContaining({ code: "ENOENT" })
        }
      ]);

      await writeFile(
        localDataPath,
        JSON.stringify({
          version: 1,
          source: "repaired-test",
          ways: [
            {
              id: "repaired-way",
              bbox: [7.4509, 53.4498, 7.4742, 53.4646],
              tags: { waterway: "canal", name: "Repaired test fairway" },
              coordinates: [
                [53.4498, 7.4509],
                [53.4646, 7.4742]
              ]
            }
          ]
        })
      );

      const repairedLookup = await service.getGraphsForRoute(request);
      expect(repairedLookup.failures).toEqual([]);
      expect(repairedLookup.graphs).toHaveLength(1);
      expect(repairedLookup.graphs[0]?.edges[0]?.source).toBe(
        "local-geofabrik-repaired-test"
      );
    } finally {
      await service.close();
      await rm(temporaryDirectory, { recursive: true, force: true });
    }
  });

  it("builds a routable graph from the persistent local Geofabrik format", () => {
    const graph = localFairwaysToGraph(
      [
        {
          id: "local-1",
          bbox: [7.15, 53.62, 7.17, 53.71],
          tags: { route: "ferry", name: "Norddeich–Norderney" },
          coordinates: [
            [53.6234, 7.1559],
            [53.66, 7.16],
            [53.7023, 7.1658]
          ]
        }
      ],
      [7.0, 53.47, 7.32, 53.85],
      "germany-test.osm.pbf"
    );
    const route = buildRoute(
      {
        start: { lat: 53.6234, lon: 7.1559 },
        destination: { lat: 53.7023, lon: 7.1658 },
        vesselProfile: { draughtM: 1.4, safetyReserveM: 0.5, cruiseSpeedKn: 6 }
      },
      graph ?? undefined
    );

    expect(route?.routingMode).toBe("fairway");
    expect(route?.dataSources).toContain("local-geofabrik-germany-test.osm.pbf");
  });

  it("does not invent a traversable line between nearby disconnected waterway endpoints", () => {
    const graph = localFairwaysToGraph(
      [
        {
          id: "west",
          bbox: [7, 52, 7.01, 52],
          tags: { waterway: "canal" },
          coordinates: [
            [52, 7],
            [52, 7.01]
          ]
        },
        {
          id: "east",
          bbox: [7.011, 52, 7.02, 52],
          tags: { waterway: "canal" },
          coordinates: [
            [52, 7.011],
            [52, 7.02]
          ]
        }
      ],
      [6.9, 51.9, 7.1, 52.1],
      "disconnected-test"
    );
    expect(graph).not.toBeNull();

    const route = buildRoute(
      {
        start: { lat: 52, lon: 7 },
        destination: { lat: 52, lon: 7.02 },
        vesselProfile: { draughtM: 1, safetyReserveM: 0.3 }
      },
      graph ?? undefined
    );

    expect(route).toBeNull();
    expect(graph?.edges.some((edge) => edge.source === "fairway-graph-connectors")).toBe(false);
  });

  it("keeps the reported Ems-Jade-Kanal route on the full source geometry", () => {
    const start = { lat: 53.4498, lon: 7.4509 };
    const destination = { lat: 53.4646, lon: 7.4742 };
    const graph = localFairwaysToGraph(
      EMDEN_CANAL_REGRESSION_WAYS,
      [7.3, 53.3, 7.7, 53.6],
      "emden-canal-regression"
    );
    expect(graph).not.toBeNull();
    if (!graph) {
      throw new Error("Expected Ems-Jade-Kanal regression graph");
    }

    const route = buildRoute(
      {
        start,
        destination,
        vesselProfile: { draughtM: 1.4, safetyReserveM: 0.5, cruiseSpeedKn: 6 }
      },
      graph
    );
    expect(route).not.toBeNull();
    if (!route) {
      throw new Error("Expected Ems-Jade-Kanal regression route");
    }

    const coordinates = route.geometry.coordinates;
    const largestSegmentNm = coordinates.slice(1).reduce(
      (largest, coordinate, index) =>
        Math.max(
          largest,
          haversineDistanceNm(
            { lon: coordinates[index]![0], lat: coordinates[index]![1] },
            { lon: coordinate[0], lat: coordinate[1] }
          )
        ),
      0
    );

    expect(route.distanceNm).toBeGreaterThanOrEqual(1.2);
    expect(route.distanceNm).toBeLessThanOrEqual(1.35);
    expect(coordinates.length).toBeGreaterThanOrEqual(25);
    expect(largestSegmentNm).toBeLessThan(0.55);
    expect(coordinates).toContainEqual([7.4648841, 53.4595046]);
    expect(coordinates).toContainEqual([7.46945, 53.4616984]);
    expect(coordinates).toContainEqual([7.4724784, 53.4646149]);
    expect(route.dataSources).toContain(
      "local-geofabrik-emden-canal-regression"
    );
    expect(route.dataSources).not.toContain(
      "fairway-graph:emden-east-ems-seed"
    );
    expect(route.routeSnaps?.start.distanceM).toBeLessThan(5);
    expect(route.routeSnaps?.destination.distanceM).toBeLessThan(10);
    expect(coordinates[0]).toEqual([
      route.routeSnaps?.start.snapped.lon,
      route.routeSnaps?.start.snapped.lat
    ]);
    expect(coordinates.at(-1)).toEqual([
      route.routeSnaps?.destination.snapped.lon,
      route.routeSnaps?.destination.snapped.lat
    ]);
  });

  it("allows country-wide requests against the persistent local index", async () => {
    const temporaryDirectory = await mkdtemp(join(tmpdir(), "watermaps-local-span-"));
    const localDataPath = join(temporaryDirectory, "germany-netherlands-fairways.json");
    const request = {
      start: { lat: 52, lon: 4 },
      destination: { lat: 52, lon: 12 },
      vesselProfile: { draughtM: 1, safetyReserveM: 0.3 }
    };

    try {
      await writeFile(
        localDataPath,
        JSON.stringify({
          version: 1,
          source: "germany+netherlands",
          ways: [
            {
              id: "country-wide-test",
              bbox: [4, 52, 12, 52],
              tags: { waterway: "canal", name: "Country-wide test fairway" },
              coordinates: [
                [52, 4],
                [52, 12]
              ]
            }
          ]
        })
      );

      const service = new FairwayService({
        cache: createCache(),
        fetcher: fetch,
        liveEnabled: false,
        localDataPath
      });
      const lookup = await service.getGraphsForRoute(request);
      const route = buildRoute(request, lookup.graphs[0]);

      expect(lookup.failures).toEqual([]);
      expect(lookup.graphs).toHaveLength(1);
      expect(route?.routingMode).toBe("fairway");
      expect(route?.dataSources).toContain(
        "local-geofabrik-germany+netherlands"
      );
      await service.close();
    } finally {
      await rm(temporaryDirectory, { recursive: true, force: true });
    }
  });

  it("builds a routable graph from PostGIS fairway rows", () => {
    const graph = fairwayRowsToGraph(
      [
        {
          id: "1",
          source: "osm",
          source_id: "way-1",
          name: "Harbour Reach",
          min_depth_m: "4.2",
          geometry: {
            type: "LineString",
            coordinates: [
              [10, 54],
              [10.04, 54.02]
            ]
          }
        },
        {
          id: "2",
          source: "osm",
          source_id: "way-2",
          name: "Outer Reach",
          min_depth_m: 4.2,
          geometry: {
            type: "LineString",
            coordinates: [
              [10.04, 54.02],
              [10.1, 54.04]
            ]
          }
        }
      ],
      [9.9, 53.9, 10.2, 54.1]
    );

    expect(graph).not.toBeNull();
    const route = buildRoute(
      {
        start: { lat: 54, lon: 10 },
        destination: { lat: 54.04, lon: 10.1 },
        vesselProfile: { draughtM: 1.2, safetyReserveM: 0.4 }
      },
      graph ?? undefined
    );

    expect(route?.routingMode).toBe("fairway");
    expect(route?.dataSources).toContain("fairway-graph:postgis-9.900-53.900-10.200-54.100");
    expect(route?.dataSources).toContain("postgis-osm");
  });

  it("routes the iPhone Emden coordinates through intermediate fairway vertices", () => {
    const start = { lat: 53.3306, lon: 7.1752 };
    const destination = { lat: 53.6741, lon: 7.1474 };
    const graph = fairwayRowsToGraph(
      [
        {
          id: "emden-main-reach",
          source: "osm",
          source_id: "way-main",
          name: "Ems Fahrwasser",
          min_depth_m: null,
          geometry: {
            type: "LineString",
            coordinates: [
              [7.1752, 53.3306],
              [7.1751368, 53.3331995],
              [7.16, 53.42],
              [7.1474, 53.55],
              [7.18, 53.61]
            ]
          }
        },
        {
          id: "busetief-branch",
          source: "osm",
          source_id: "way-branch",
          name: "Busetief",
          min_depth_m: null,
          geometry: {
            type: "LineString",
            coordinates: [
              [7.1474, 53.55],
              [7.1414995, 53.6668156],
              [7.1474, 53.6741]
            ]
          }
        }
      ],
      [6.9974, 53.1806, 7.3252, 53.8241]
    );

    expect(graph).not.toBeNull();
    const route = buildRoute(
      {
        start,
        destination,
        vesselProfile: { draughtM: 1.4, safetyReserveM: 0.5, cruiseSpeedKn: 12 }
      },
      graph ?? undefined
    );

    expect(route).not.toBeNull();
    expect(route?.routingMode).toBe("fairway");
    expect(route?.dataSources).toContain("postgis-osm");
    expect(route?.routeSnaps?.start.requested).toEqual(start);
    expect(route?.routeSnaps?.destination.requested).toEqual(destination);
    expect(route?.geometry.coordinates[0]).toEqual([
      route?.routeSnaps?.start.snapped.lon,
      route?.routeSnaps?.start.snapped.lat
    ]);
    expect(route?.geometry.coordinates.at(-1)).toEqual([
      route?.routeSnaps?.destination.snapped.lon,
      route?.routeSnaps?.destination.snapped.lat
    ]);
    expect(route?.geometry.coordinates.some(([lon, lat]) => lon === 7.1474 && lat === 53.55)).toBe(true);
  });

  it("builds a graph from OSM/OpenSeaMap Overpass ways", () => {
    const graph = overpassToGraph(
      {
        elements: [
          {
            type: "way",
            id: 123,
            tags: {
              "seamark:type": "navigation_line",
              "seamark:navigation_line:minimum_depth": "3.5"
            },
            geometry: [
              { lat: 54, lon: 10 },
              { lat: 54.02, lon: 10.05 }
            ]
          }
        ]
      },
      [9.9, 53.9, 10.1, 54.1]
    );

    expect(graph).not.toBeNull();
    expect(graph?.edges[0]?.source).toBe("osm-overpass-seamarks");
    expect(graph?.edges[0]?.minDepthM).toBe(3.5);
  });

  it("accepts navigable canals but rejects explicitly closed waterways", () => {
    const graph = overpassToGraph(
      {
        elements: [
          {
            type: "way",
            id: 201,
            tags: { waterway: "canal", boat: "yes", name: "Datteln-Hamm-Kanal" },
            geometry: [
              { lat: 51.65, lon: 7.35 },
              { lat: 51.66, lon: 7.4 }
            ]
          },
          {
            type: "way",
            id: 202,
            tags: { waterway: "canal", boat: "no", name: "Gesperrter Kanal" },
            geometry: [
              { lat: 51.66, lon: 7.4 },
              { lat: 51.67, lon: 7.45 }
            ]
          }
        ]
      },
      [7.3, 51.6, 7.5, 51.7]
    );

    expect(graph).not.toBeNull();
    expect(graph?.edges).toHaveLength(1);
    expect(graph?.edges[0]?.name).toBe("Datteln-Hamm-Kanal");
  });

  it("topologically joins graph fragments from PostGIS and live data", () => {
    const first = fairwayRowsToGraph(
      [
        {
          id: "north",
          source: "osm",
          source_id: "north",
          name: "Dortmund-Ems-Kanal",
          min_depth_m: null,
          geometry: {
            type: "LineString",
            coordinates: [
              [7.3, 52.1],
              [7.35, 52]
            ]
          }
        }
      ],
      [7.2, 51.8, 7.6, 52.2]
    );
    const second = overpassToGraph(
      {
        elements: [
          {
            type: "way",
            id: 301,
            tags: { waterway: "canal", boat: "yes", name: "Datteln-Hamm-Kanal" },
            geometry: [
              { lat: 52, lon: 7.35 },
              { lat: 51.9, lon: 7.5 }
            ]
          }
        ]
      },
      [7.2, 51.8, 7.6, 52.2]
    );
    const graph = mergeConnectedFairwayGraphs([first!, second!]);
    const route = buildRoute(
      {
        start: { lat: 52.1, lon: 7.3 },
        destination: { lat: 51.9, lon: 7.5 },
        vesselProfile: { draughtM: 1.2, safetyReserveM: 0.3 }
      },
      graph ?? undefined
    );

    expect(route).not.toBeNull();
    expect(route?.dataSources).toContain("postgis-osm");
    expect(route?.dataSources).toContain("osm-overpass-waterway-canal");
  });

  it("carries OSM vessel restrictions into the routing graph", () => {
    const graph = fairwayRowsToGraph(
      [
        {
          id: "restricted",
          source: "osm",
          source_id: "way-restricted",
          name: "Niedrige Durchfahrt",
          min_depth_m: "3.0",
          properties: { maxheight: "2.4 m", maxwidth: "3.2", maxdraft: "1.8", oneway: "yes" },
          geometry: {
            type: "LineString",
            coordinates: [
              [7, 52],
              [7.04, 52]
            ]
          }
        }
      ],
      [6.9, 51.9, 7.1, 52.1]
    );

    expect(graph?.edges[0]).toMatchObject({
      maxAirDraftM: 2.4,
      maxBeamM: 3.2,
      maxDraughtM: 1.8,
      oneway: true
    });
    expect(
      buildRoute(
        {
          start: { lat: 52, lon: 7 },
          destination: { lat: 52, lon: 7.04 },
          vesselProfile: { draughtM: 1.4, safetyReserveM: 0.3, airDraftM: 2.5, beamM: 3 }
        },
        graph ?? undefined
      )
    ).toBeNull();
  });
});