import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { NextRequest } from "next/server";

import { POST as candidatesPOST } from "@/app/api/0pt/internal/er/candidates/route";

const TOKEN = "test-er-internal-token";
let previousToken: string | undefined;

function request(body: unknown, token: string | undefined = TOKEN): NextRequest {
  const headers: Record<string, string> = { "content-type": "application/json" };
  if (token !== undefined) headers["x-internal-token"] = token;
  return new NextRequest("http://localhost/api/0pt/internal/er/candidates", {
    method: "POST",
    headers,
    body: JSON.stringify(body),
  });
}

function baseBody(records: Array<{ record_id: string; fields: Record<string, unknown> }>) {
  return {
    tenant_id: "tenant_a",
    project_id: "project_a",
    records,
    blocking_fields: ["city"],
    compare_fields: [{ field: "name", weight: 1 }],
    auto_match_threshold: 0.9,
    review_threshold: 0.6,
  };
}

beforeEach(() => {
  previousToken = process.env.INTERNAL_TOKEN;
  process.env.INTERNAL_TOKEN = TOKEN;
});

afterEach(() => {
  if (previousToken === undefined) delete process.env.INTERNAL_TOKEN;
  else process.env.INTERNAL_TOKEN = previousToken;
});

describe("POST /api/0pt/internal/er/candidates", () => {
  it("fails closed without the internal service token", async () => {
    // OBS: request(body, undefined) triggar default-parametern (skickar GILTIGT
    // token) — skicka tom string för "utan token" (fail-closed → 401).
    const res = await candidatesPOST(
      request(
        baseBody([
          { record_id: "a", fields: { name: "Acme AB", city: "Stockholm" } },
          { record_id: "b", fields: { name: "Acme AB", city: "Stockholm" } },
        ]),
        "",
      ),
    );
    expect(res.status).toBe(401);
  });

  it("never emits a score-only fuzzy company match even above auto_match_threshold", async () => {
    const res = await candidatesPOST(
      request(
        baseBody([
          { record_id: "a", fields: { name: "Acme Consulting AB", city: "Stockholm" } },
          { record_id: "b", fields: { name: "Acme Consulting A B", city: "Stockholm" } },
        ]),
      ),
    );
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body.pairs).toHaveLength(1);
    expect(body.pairs[0].score).toBeGreaterThanOrEqual(0.9);
    expect(body.pairs[0].decided_by).toBe("score");
    expect(body.pairs[0].status).toBe("pending_review");
    expect(body.review_queue.map((pair: { candidate_id: string }) => pair.candidate_id)).toEqual([
      body.pairs[0].candidate_id,
    ]);
  });

  it("allows a same-country registration number to hard-link despite punctuation differences", async () => {
    const res = await candidatesPOST(
      request(
        baseBody([
          {
            record_id: "a",
            fields: {
              name: "Acme Sweden AB",
              city: "Stockholm",
              registration_country: "SE",
              org_nr: "556000-0001",
            },
          },
          {
            record_id: "b",
            fields: {
              name: "Acme Sverige",
              city: "Stockholm",
              registration_country: "se",
              org_nr: "5560000001",
            },
          },
        ]),
      ),
    );
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body.pairs).toHaveLength(1);
    expect(body.pairs[0].status).toBe("match");
    expect(body.pairs[0].decided_by).toBe("0pt.company.stable-identifiers.v3");
    expect(body.review_queue).toEqual([]);
  });

  it("does not treat the same national registration number in different countries as global identity", async () => {
    const res = await candidatesPOST(
      request(
        baseBody([
          {
            record_id: "a",
            fields: {
              name: "Acme Consulting AB",
              city: "Stockholm",
              registration_country: "SE",
              org_nr: "123456789",
            },
          },
          {
            record_id: "b",
            fields: {
              name: "Acme Consulting A B",
              city: "Stockholm",
              registration_country: "NO",
              org_nr: "123456789",
            },
          },
        ]),
      ),
    );
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body.pairs).toHaveLength(1);
    expect(body.pairs[0].decided_by).toBe("score");
    expect(body.pairs[0].status).toBe("pending_review");
  });

  it("lets conflicting stable identity evidence dominate a matching global LEI", async () => {
    const res = await candidatesPOST(
      request(
        baseBody([
          {
            record_id: "a",
            fields: {
              name: "Acme Sweden AB",
              city: "Stockholm",
              registration_country: "SE",
              lei: "549300EXAMPLE123",
              org_nr: "556000-0001",
            },
          },
          {
            record_id: "b",
            fields: {
              name: "Acme Sweden AB",
              city: "Stockholm",
              registration_country: "SE",
              lei: "549300EXAMPLE123",
              org_nr: "556000-9999",
            },
          },
        ]),
      ),
    );
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body.pairs).toHaveLength(1);
    expect(body.pairs[0].status).toBe("non_match");
    expect(body.pairs[0].decided_by).toBe("0pt.company.stable-identifiers.v3");
  });

  it("can hard-link a globally matching LEI when no scoped identifier contradicts it", async () => {
    const res = await candidatesPOST(
      request(
        baseBody([
          {
            record_id: "a",
            fields: { name: "Acme Holding", city: "Stockholm", lei: "549300-EXAMPLE-123" },
          },
          {
            record_id: "b",
            fields: { name: "ACME Holdings Group", city: "Stockholm", lei: "549300EXAMPLE123" },
          },
        ]),
      ),
    );
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body.pairs).toHaveLength(1);
    expect(body.pairs[0].status).toBe("match");
    expect(body.pairs[0].decided_by).toBe("0pt.company.stable-identifiers.v3");
  });
});