import { describe, expect, it, vi } from "vitest";

import {
  createFeatureHttpBinding,
  defineFeatureHttpOperation,
  type HttpExecutionOutcome,
  type InstalledHttpOperationExecutor,
} from "../../../src/adapters/http/index.ts";
import {
  mappingFailure,
  mappingSuccess,
} from "../../../src/contracts/boundary-mapper.ts";
import type {
  InstalledHttpContract,
  RuntimeValidator,
} from "../../../src/contracts/external-contract-runtime.ts";

type ResourceInput = Readonly<{ resourceId: string }>;
type ResourceWire = Readonly<{ id: string; title: string }>;
type ResourceProblem = Readonly<{ code?: string }>;
type Resource = Readonly<{ id: string; title: string }>;

function validator<T>(schemaId: string): RuntimeValidator<T> {
  return Object.freeze({
    schemaId,
    safeParse(value: unknown) {
      return Object.freeze({
        success: true as const,
        data: value as T,
      });
    },
  });
}

const LOAD_RESOURCE_CONTRACT = Object.freeze({
  contract: Object.freeze({
    operationId: "LOAD_RESOURCE",
    method: "GET" as const,
    pathTemplate: "/resources/{resourceId}",
    inputValidator: validator<ResourceInput>("ResourceInput"),
    outputValidator: validator<ResourceWire>("ResourceWire"),
    problemValidator: validator<ResourceProblem>("ResourceProblem"),
    acceptedStatuses: Object.freeze([200]),
    emptyBodyStatuses: Object.freeze([]),
    retrySemantics: "SAFE" as const,
    requestBody: "NONE" as const,
    responseBody: "REQUIRED_JSON" as const,
    commandRecovery: null,
    commandEffect: null,
    projectRequest(input: ResourceInput) {
      return Object.freeze({
        pathValues: Object.freeze({ resourceId: input.resourceId }),
        queryEntries: Object.freeze([]),
        body: null,
      });
    },
  }),
  frontend: Object.freeze({
    policyId: "TEST_LOAD_RESOURCE",
    requestByteLimit: 0,
    responseByteLimit: 8_192,
    totalDeadlineMs: 1_000,
    retryBudget: 0 as const,
    authProfileId: "TEST",
    diagnosticsOperation: "test.load-resource",
  }),
}) satisfies InstalledHttpContract<ResourceInput, ResourceWire, ResourceProblem>;

const OPERATIONS = Object.freeze({
  LOAD_RESOURCE: defineFeatureHttpOperation({
    contract: LOAD_RESOURCE_CONTRACT,
    routeId: "RESOURCE_DETAIL",
    mapSuccess(value) {
      if (value.title.length === 0) {
        return mappingFailure("MAPPING_INVARIANT_REJECTED");
      }
      return mappingSuccess(
        Object.freeze({ id: value.id, title: value.title }),
      );
    },
    mapProblem(problem, metadata) {
      if (metadata.status !== 409) return undefined;
      return Object.freeze({
        kind: "CONFLICT" as const,
        code: problem.code ?? "RESOURCE_CONFLICT",
      });
    },
  }),
} as const);

function scriptedExecutor<WireOutput, Problem>(
  outcome: HttpExecutionOutcome<WireOutput, Problem>,
) {
  const calls: Array<
    Readonly<{
      contract: unknown;
      input: unknown;
      context: unknown;
    }>
  > = [];
  const implementation = async (
    contract: unknown,
    input: unknown,
    context: unknown,
  ) => {
    calls.push(Object.freeze({ contract, input, context }));
    return outcome;
  };
  const execute = vi.fn(implementation) as unknown as
    InstalledHttpOperationExecutor["execute"];
  return {
    executor: Object.freeze({ execute }) satisfies InstalledHttpOperationExecutor,
    calls,
    execute,
  };
}

describe("feature HTTP binding", () => {
  it("keeps contract-derived input while platform owns route/context execution", async () => {
    const scripted = scriptedExecutor<ResourceWire, ResourceProblem>(
      Object.freeze({
        kind: "SUCCESS" as const,
        value: Object.freeze({ id: "resource-1", title: "Reference" }),
        metadata: Object.freeze({ status: 200 }),
        effect: "NOT_APPLICABLE" as const,
      }),
    );
    const binding = createFeatureHttpBinding(scripted.executor, OPERATIONS);

    const result = await binding.execute("LOAD_RESOURCE", {
      resourceId: "resource-1",
    });

    expect(result).toEqual({
      ok: true,
      value: { id: "resource-1", title: "Reference" },
    });
    expect(scripted.calls).toEqual([
      {
        contract: LOAD_RESOURCE_CONTRACT,
        input: { resourceId: "resource-1" },
        context: { routeId: "RESOURCE_DETAIL" },
      },
    ]);
  });

  it("normalizes transport failure before it crosses the feature gateway", async () => {
    const scripted = scriptedExecutor<ResourceWire, ResourceProblem>(
      Object.freeze({
        kind: "TRANSPORT_FAILURE" as const,
        failure: Object.freeze({
          kind: "TIMEOUT" as const,
          retryable: true,
        }),
        effect: "NOT_STARTED" as const,
      }),
    );
    const binding = createFeatureHttpBinding(scripted.executor, OPERATIONS);

    const result = await binding.execute("LOAD_RESOURCE", {
      resourceId: "resource-1",
    });

    expect(result.ok).toBe(false);
    if (result.ok) return;
    expect(result.error.kind).toBe("REQUEST_TIMEOUT");
    expect(result.error.operationId).toBe("LOAD_RESOURCE");
    expect(result.error.effect).toBe("NOT_STARTED");
  });

  it("turns a domain mapper rejection into the shared mapping failure", async () => {
    const scripted = scriptedExecutor<ResourceWire, ResourceProblem>(
      Object.freeze({
        kind: "SUCCESS" as const,
        value: Object.freeze({ id: "resource-1", title: "" }),
        metadata: Object.freeze({ status: 200 }),
        effect: "NOT_APPLICABLE" as const,
      }),
    );
    const binding = createFeatureHttpBinding(scripted.executor, OPERATIONS);

    const result = await binding.execute("LOAD_RESOURCE", {
      resourceId: "resource-1",
    });

    expect(result.ok).toBe(false);
    if (result.ok) return;
    expect(result.error.kind).toBe("MAPPING_CONTRACT_VIOLATION");
    expect(result.error.code).toBe("MAPPING_INVARIANT_REJECTED");
  });

  it("lets the feature interpret a typed business problem", async () => {
    const scripted = scriptedExecutor<ResourceWire, ResourceProblem>(
      Object.freeze({
        kind: "PROBLEM" as const,
        problem: Object.freeze({ code: "RESOURCE_NAME_EXISTS" }),
        metadata: Object.freeze({ status: 409 }),
        effect: "NOT_APPLIED" as const,
      }),
    );
    const binding = createFeatureHttpBinding(scripted.executor, OPERATIONS);

    const result = await binding.execute("LOAD_RESOURCE", {
      resourceId: "resource-1",
    });

    expect(result).toMatchObject({
      ok: false,
      error: {
        kind: "CONFLICT",
        code: "RESOURCE_NAME_EXISTS",
        httpStatus: 409,
      },
    });
  });
});