/**
 * Regression: focused deconstruct targetNodeId identity boundary.
 *
 * Verifies the deterministic enforcement invariant:
 *   request.targetNodeId (original graph node ID) must be the final
 *   API response targetNodeId regardless of what the model returns.
 */

import { afterEach, beforeEach, describe, it, expect, vi } from "vitest";
import { focusedDeconstructJsonSchema, validateFocusedDeconstructSchema } from "@/lib/graph/focused-investigation";

// ── helpers ──────────────────────────────────────────────────────────────

function makeMockProvider(inventedTargetNodeId) {
  return {
    generateReconstruction: vi.fn().mockResolvedValue({
      response: {
        targetNodeId: inventedTargetNodeId,
        observations: ["doc is minimal", "processes in founder's head"],
        uncertainties: ["whether formal docs can capture tacit knowledge"],
        assumptions: ["documentation is primary mechanism for knowledge transfer"],
        relationships: [
          { from: "founder", to: "processes", type: "holds" },
          { from: "ops-context", to: "docs-infra", type: "depends_on" },
        ],
        possibleFollowUpQuestions: [
          "What processes does the founder hold tacitly?",
          "How is knowledge transferred when founder is unavailable?",
        ],
      },
      providerApiPath: "/api/chat",
      providerExecution: { chatRequestAttempted: true },
    }),
  };
}

// ── Boundary test ────────────────────────────────────────────────────────

describe("focused-deconstruct targetNodeId identity boundary", () => {
  beforeEach(() => {
    vi.resetModules();
  });

  afterEach(() => {
    vi.doUnmock("@/lib/llm/provider");
  });

  it("enforces the canonical focused relationship structure", () => {
    const base = {
      targetNodeId: "node-id", observations: [], uncertainties: [], assumptions: [],
      possibleFollowUpQuestions: [],
    };
    expect(validateFocusedDeconstructSchema({ ...base, relationships: [] })).toEqual([]);
    expect(validateFocusedDeconstructSchema({
      ...base,
      relationships: [{ from: "supplier changed", to: "defect rate increased", type: "associated with" }],
    })).toEqual([]);

    const invalidRelationships = [
      "not an array",
      [{}],
      [{ from: "a", type: "links" }],
      [{ from: "a", to: "b" }],
      [{ from: "", to: "b", type: "links" }],
      [{ from: "a", to: "", type: "links" }],
      [{ from: "a", to: "b", type: "" }],
      [{ from: "a", to: "b", type: "links", rationale: "extra" }],
      [{ from: "a", to: "b", type: "links", extra: "extra" }],
    ];
    invalidRelationships.forEach((relationships) => {
      expect(validateFocusedDeconstructSchema({ ...base, relationships }).length).toBeGreaterThan(0);
    });
  });

  it("request targetNodeId overrides model-invented targetNodeId", async () => {
    const requestTargetNodeId = "nk04xvk"; // original graph node ID
    const inventedModelId = "invented-model-id";

    vi.doMock("@/lib/llm/provider", () => ({
      getProvider: () => makeMockProvider(inventedModelId),
      getProviderModelName: () => "configured-model",
    }));

    const { POST } = await import("../app/api/focused-investigation/deconstruct/route.js");

    const requestBody = {
      targetNodeId: requestTargetNodeId,
      targetLabel: "Whether unclear or uneven distribution of responsibilities is preventing autonomy in key areas.",
      targetDescription: "Original open question node label",
      centralStatement: "Current operational context and documentation state",
      question:
        "What was the comparable state before whether unclear or uneven distribution of responsibilities is preventing autonomy in key areas?",
      answer: "Documentation is minimal, most processes are in the head of the founder.",
    };

    const request = new Request("http://localhost/api/focused-investigation/deconstruct", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(requestBody),
    });

    const response = await POST(request);
    expect(response.status).toBe(200);

    const json = await response.json();
    expect(json.success).toBe(true);

    // THE INVARIANT: final API targetNodeId = request targetNodeId (authoritative)
    expect(json.targetNodeId).toBe(requestTargetNodeId);
    expect(json.targetNodeId).not.toBe(inventedModelId);
  });

  it("supplies the focused-deconstruction schema through the provider seam", async () => {
    const generateReconstruction = vi.fn().mockResolvedValue({
      response: {
        targetNodeId: "model-id",
        observations: [],
        uncertainties: [],
        assumptions: [],
        relationships: [],
        possibleFollowUpQuestions: [],
      },
      providerApiPath: "/api/chat",
      providerExecution: { chatRequestAttempted: true },
    });
    vi.doMock("@/lib/llm/provider", () => ({
      getProvider: () => ({ generateReconstruction }),
      getProviderModelName: () => "gpt-5.6-terra",
    }));
    const { POST } = await import("../app/api/focused-investigation/deconstruct/route.js");

    const response = await POST(new Request("http://localhost/api/focused-investigation/deconstruct", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        targetNodeId: "node-id",
        targetLabel: "label",
        targetDescription: "description",
        centralStatement: "central statement",
        question: "question?",
        answer: "answer.",
      }),
    }));

    expect(response.status).toBe(200);
    expect(generateReconstruction).toHaveBeenCalledWith(
      expect.any(String),
      "gpt-5.6-terra",
      focusedDeconstructJsonSchema,
    );
  });

  it("semantic fields pass through unchanged from model", async () => {
    const mockObs = ["doc is minimal", "processes in founder's head"];
    const mockUnc = ["whether formal docs can capture tacit knowledge"];
    const mockAssm = ["documentation is primary mechanism for knowledge transfer"];
    const mockRel = [
      { from: "founder", to: "processes", type: "holds" },
      { from: "ops-context", to: "docs-infra", type: "depends_on" },
    ];
    const mockFuq = [
      "What processes does the founder hold tacitly?",
      "How is knowledge transferred when founder is unavailable?",
    ];

    vi.doMock("@/lib/llm/provider", () => ({
      getProvider: () => ({
        generateReconstruction: vi.fn().mockResolvedValue({
          response: {
            targetNodeId: "some-invented-id",
            observations: mockObs,
            uncertainties: mockUnc,
            assumptions: mockAssm,
            relationships: mockRel,
            possibleFollowUpQuestions: mockFuq,
          },
          providerApiPath: "/api/chat",
          providerExecution: { chatRequestAttempted: true },
        }),
      }),
      getProviderModelName: () => "configured-model",
    }));

    const { POST } = await import("../app/api/focused-investigation/deconstruct/route.js");

    const request = new Request("http://localhost/api/focused-investigation/deconstruct", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        targetNodeId: "nk04xvk",
        targetLabel: "label",
        targetDescription: "desc",
        centralStatement: "central",
        question: "question?",
        answer: "answer.",
      }),
    });

    const response = await POST(request);
    const json = await response.json();

    // Semantic fields unchanged
    expect(json.observations).toEqual(mockObs);
    expect(json.uncertainties).toEqual(mockUnc);
    expect(json.assumptions).toEqual(mockAssm);
    expect(json.relationships).toEqual(mockRel);
    expect(json.possibleFollowUpQuestions).toEqual(mockFuq);
  });

  it("contribution append preserves authoritative targetNodeId", () => {
    // Simulates reasoning-workspace.jsx:1178-1189 after the fix:
    // onFocusedContribution calls with body.targetNodeId (the original graph node)
    const requestTargetNodeId = "nk04xvk";
    const inventedModelId = "invented-model-id";

    const contribution = {
      targetNodeId: requestTargetNodeId,
      targetLabel: "label",
      targetDescription: "desc",
      question: "question?",
      answer: "answer.",
      observations: ["obs1"],
      uncertainties: ["unc1"],
      assumptions: ["asm1"],
      relationships: [{ from: "a", to: "b", type: "depends_on" }],
      possibleFollowUpQuestions: ["fuq1"],
    };

    expect(contribution.targetNodeId).toBe(requestTargetNodeId);
    expect(contribution.targetNodeId).not.toBe(inventedModelId);

    // Simulates ThreadContributionsBadge filter: contributions.filter(c => c.targetNodeId === nodeId)
    const threadContribs = [contribution].filter((c) => c.targetNodeId === requestTargetNodeId);
    expect(threadContribs.length).toBe(1);
  });

  it("full identity path: request → response → contribution", async () => {
    const originalNodeId = "nk04xvk";
    const modelInventedId = "investigation_node_responsibility_distribution_autonomy";

    vi.doMock("@/lib/llm/provider", () => ({
      getProvider: () => ({
        generateReconstruction: vi.fn().mockResolvedValue({
          response: {
            targetNodeId: modelInventedId,
            observations: ["Documentation is minimal."],
            uncertainties: [],
            assumptions: [
              "That formal documentation is the primary mechanism for capturing or transferring the founder's tacit knowledge of processes.",
            ],
            relationships: [
              { from: "Founder", to: "Processes", type: "holds" },
              { from: "Operational Context", to: "Documentation Infrastructure", type: "affects" },
            ],
            possibleFollowUpQuestions: [],
          },
          providerApiPath: "/api/chat",
          providerExecution: { chatRequestAttempted: true },
        }),
      }),
      getProviderModelName: () => "configured-model",
    }));

    const { POST } = await import("../app/api/focused-investigation/deconstruct/route.js");

    const request = new Request("http://localhost/api/focused-investigation/deconstruct", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        targetNodeId: originalNodeId,
        targetLabel:
          "Whether unclear or uneven distribution of responsibilities is preventing autonomy in key areas.",
        targetDescription: "Original open question node description",
        centralStatement: "Central statement",
        question:
          "What was the comparable state before whether unclear or uneven distribution of responsibilities is preventing autonomy in key areas?",
        answer: "Documentation is minimal, most processes are in the head of the founder.",
      }),
    });

    const response = await POST(request);
    expect(response.status).toBe(200);
    const json = await response.json();

    // Identity path verification:
    // 1. Request targetNodeId
    expect(json.targetNodeId).toBe(originalNodeId);

    // 2. Response carries authoritative identity (not model-invented)
    expect(json.targetNodeId).not.toBe(modelInventedId);

    // 3. Semantic fields from the model remain unchanged
    expect(json.observations).toEqual(["Documentation is minimal."]);
    expect(json.uncertainties).toEqual([]);
    expect(json.assumptions).toEqual([
      "That formal documentation is the primary mechanism for capturing or transferring the founder's tacit knowledge of processes.",
    ]);
    expect(json.relationships).toEqual([
      { from: "Founder", to: "Processes", type: "holds" },
      { from: "Operational Context", to: "Documentation Infrastructure", type: "affects" },
    ]);
    expect(json.possibleFollowUpQuestions).toEqual([]);

    // 4. Stored contribution would use originalNodeId (not modelInventedId)
    const stored = { ...json };
    expect(stored.targetNodeId).toBe(originalNodeId);
  });

  it("provider envelope fields do not leak into API response", async () => {
    vi.doMock("@/lib/llm/provider", () => ({
      getProvider: () => ({
        generateReconstruction: vi.fn().mockResolvedValue({
          response: {
            targetNodeId: "nk04xvk",
            observations: ["obs"],
            uncertainties: ["unc"],
            assumptions: ["asm"],
            relationships: [],
            possibleFollowUpQuestions: ["fuq"],
          },
          providerApiPath: "/api/chat",
          providerExecution: { chatRequestAttempted: true, chatRequestSucceeded: true },
        }),
      }),
      getProviderModelName: () => "configured-model",
    }));

    const { POST } = await import("../app/api/focused-investigation/deconstruct/route.js");

    const response = await POST(
      new Request("http://localhost/api/focused-investigation/deconstruct", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          targetNodeId: "nk04xvk",
          targetLabel: "label",
          targetDescription: "desc",
          centralStatement: "central",
          question: "q?",
          answer: "a.",
        }),
      }),
    );

    expect(response.status).toBe(200);
    const json = await response.json();

    // Semantic fields present
    expect(json.success).toBe(true);
    expect(json.targetNodeId).toBe("nk04xvk");
    expect(json.observations).toEqual(["obs"]);
    expect(json.possibleFollowUpQuestions).toEqual(["fuq"]);

    // Provider envelope fields must NOT appear in the response
    expect(json.providerApiPath).toBeUndefined();
    expect(json.providerExecution).toBeUndefined();
  });

  it("preserves the 500 provider-failure contract while logging structural diagnostics", async () => {
    const errorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
    vi.doMock("@/lib/llm/provider", () => ({
      getProvider: () => ({
        generateReconstruction: vi.fn().mockRejectedValue(Object.assign(new Error("provider failed"), {
          providerApiPath: "/v1/responses",
          statusCode: 400,
        })),
      }),
      getProviderModelName: () => "gpt-5.6-terra",
    }));
    const { POST } = await import("../app/api/focused-investigation/deconstruct/route.js");

    try {
      const response = await POST(new Request("http://localhost/api/focused-investigation/deconstruct", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          targetNodeId: "node-id", targetLabel: "label", targetDescription: "description",
          centralStatement: "central", question: "question?", answer: "answer.",
        }),
      }));
      expect(response.status).toBe(500);
      await expect(response.json()).resolves.toEqual({ error: "provider failed" });
      expect(errorSpy).toHaveBeenCalledWith(
        "[api/focused-investigation/deconstruct] provider failure",
        expect.objectContaining({ targetNodeId: "node-id", providerApiPath: "/v1/responses" }),
      );
    } finally {
      errorSpy.mockRestore();
    }
  });

  it("preserves the 502 validation-failure contract with diagnostics", async () => {
    vi.doMock("@/lib/llm/provider", () => ({
      getProvider: () => ({
        generateReconstruction: vi.fn().mockResolvedValue({
          response: {}, providerApiPath: "/v1/responses",
        }),
      }),
      getProviderModelName: () => "gpt-5.6-terra",
    }));
    const { POST } = await import("../app/api/focused-investigation/deconstruct/route.js");
    const response = await POST(new Request("http://localhost/api/focused-investigation/deconstruct", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        targetNodeId: "node-id", targetLabel: "label", targetDescription: "description",
        centralStatement: "central", question: "question?", answer: "answer.",
      }),
    }));

    expect(response.status).toBe(502);
    await expect(response.json()).resolves.toMatchObject({
      success: false,
      error: "Focused deconstruction result did not match expected schema",
      targetNodeId: "node-id",
    });
  });
});