import { describe, it, expect, vi } from "vitest";
import { reconstructionSchema } from "@/lib/reconstruction/schema";
import { parseReconstruction } from "@/lib/reconstruction/schema";

describe("reconstruction schema", () => {
  it("validates a complete valid reconstruction", () => {
    const input = {
      observations: [{ id: "o1", description: "Saw smoke", confidence: "high" }],
      reportedClaims: [{ id: "rc1", description: "He said the alarm went off", confidence: "medium", attributedTo: "John" }],
      assumptions: [{ id: "a1", description: "It was a fire", confidence: "low" }],
      entities: [{ id: "e1", description: "John", confidence: "high" }],
      transitions: [{ id: "t1", description: "John left the room", confidence: "medium", entity: "John", previousState: "present", currentState: "gone", explanationStatus: "confirmed" }],
      expectedButMissing: [{ id: "eb1", description: "No one called 911", confidence: "high" }],
      presentButUnexpected: [{ id: "pb1", description: "The lights were on", confidence: "low" }],
      contradictions: [{ id: "c1", description: "Said he was home but car is gone", confidence: "medium" }],
      openUncertainties: [{ id: "ou1", description: "Who was in the room?", confidence: "high" }],
    };

    const result = reconstructionSchema.safeParse(input);
    expect(result.success).toBe(true);
  });

  it("rejects invalid confidence values", () => {
    const input = {
      observations: [{ id: "o1", description: "test", confidence: "extreme" }],
      reportedClaims: [],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    };

    const result = reconstructionSchema.safeParse(input);
    expect(result.success).toBe(false);
    if (!result.success) {
      expect(result.error.issues[0].message).toContain("Expected");
    }
  });

  it("rejects missing required fields", () => {
    const input = {
      observations: [{ id: "o1" }],
      reportedClaims: [],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    };

    const result = reconstructionSchema.safeParse(input);
    expect(result.success).toBe(false);
  });

  it("rejects invalid confidence values in reportedClaims", () => {
    const input = {
      observations: [],
      reportedClaims: [{ id: "rc1", description: "test", confidence: "very_high", attributedTo: null }],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    };

    const result = reconstructionSchema.safeParse(input);
    expect(result.success).toBe(false);
  });

  it("rejects empty transitions", () => {
    const input = {
      observations: [],
      reportedClaims: [],
      assumptions: [],
      entities: [],
      transitions: [{ id: "t1", description: "", confidence: "high", entity: "", previousState: "", currentState: "", explanationStatus: "" }],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    };

    const result = reconstructionSchema.safeParse(input);
    expect(result.success).toBe(false);
  });

  it("allows null attributedTo on reported claims", () => {
    const input = {
      observations: [],
      reportedClaims: [{ id: "rc1", description: "Someone called it in", confidence: "medium", attributedTo: null }],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    };

    const result = reconstructionSchema.safeParse(input);
    expect(result.success).toBe(true);
  });
});

describe("parseReconstruction", () => {
  it("parses a raw JSON string", () => {
    const raw = JSON.stringify({
      observations: [{ id: "o1", description: "test", confidence: "high" }],
      reportedClaims: [],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    });

    const result = parseReconstruction(raw);
    expect(result.observations[0].id).toBe("o1");
  });

  it("rejects malformed JSON string", () => {
    expect(() => parseReconstruction("{invalid json")).toThrow(SyntaxError);
  });

  it("rejects valid JSON that fails schema validation", () => {
    const raw = JSON.stringify({
      observations: [{ id: "o1", description: "test", confidence: "extreme" }],
      reportedClaims: [],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    });

    expect(() => parseReconstruction(raw)).toThrow();
  });
});

describe("empty scenario rejection", () => {
  it("rejects empty string", () => {
    const trimmed = "".trim();
    expect(trimmed.length).toBe(0);
  });

  it("rejects whitespace-only string", () => {
    const trimmed = "   \n\t  ".trim();
    expect(trimmed.length).toBe(0);
  });
});

describe("provider response parsing", () => {
  it("handles Ollama generate response shape", async () => {
    vi.stubGlobal("process", { env: { OLLAMA_BASE_URL: "http://localhost:11434" } });

    const mockResponse = JSON.stringify({
      observations: [{ id: "o1", description: "test", confidence: "high" }],
      reportedClaims: [],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    });

    global.fetch = vi.fn().mockResolvedValue({
      ok: true,
      json: async () => ({ response: mockResponse }),
    });

    const { getProvider } = await import("@/lib/llm/provider");
    const provider = new getProvider().constructor ? null : getProvider();
    
    // The provider is instantiated in getProvider
    expect(true).toBe(true);
  });

  it("handles raw JSON object response", () => {
    const parsed = parseReconstruction({
      observations: [],
      reportedClaims: [{ id: "rc1", description: "he said", confidence: "medium", attributedTo: "Alice" }],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    });

    expect(parsed.reportedClaims[0].attributedTo).toBe("Alice");
  });
});

describe("malformed model output", () => {
  it("throws on non-JSON string", () => {
    expect(() => parseReconstruction("hello world")).toThrow(SyntaxError);
  });

  it("throws on JSON without required fields", () => {
    const raw = JSON.stringify({ notTheRightStructure: true });
    expect(() => parseReconstruction(raw)).toThrow();
  });

  it("handles empty arrays for all categories", () => {
    const result = parseReconstruction({
      observations: [],
      reportedClaims: [],
      assumptions: [],
      entities: [],
      transitions: [],
      expectedButMissing: [],
      presentButUnexpected: [],
      contradictions: [],
      openUncertainties: [],
    });

    expect(result.observations.length).toBe(0);
  });
});