/**
 * Unit tests for @sh-mcp/qbo.
 *
 * All tests inject a mock QboClientInterface — no real network calls, no AWS.
 * A mock AuthContext is passed directly; real JWT validation is the DEFERRED
 * auth layer and is not exercised here.
 */

import { describe, it, expect, vi, beforeEach } from 'vitest';
import type { AuthContext } from '@sh-mcp/shared';
import { makeSearchVendorsTool } from '../src/tools.js';
import type { QboClientInterface, SearchVendorsParams, SearchVendorsResult } from '../src/client.js';
import { QboApiError, QboThrottleError } from '../src/client.js';

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

/** A mock AuthContext that carries finance:read scope. */
function makeFinanceCtx(overrides?: Partial<AuthContext>): AuthContext {
  return {
    sub: 'adam@seahavenind.com',
    scopes: ['ops:read', 'finance:read'],
    aud: 'sh-mcp-finance',
    ...overrides,
  };
}

/** A mock QboClientInterface backed by a vitest spy. */
function makeMockClient(
  impl: (params: SearchVendorsParams) => Promise<SearchVendorsResult>,
): QboClientInterface {
  return {
    searchVendors: vi.fn(impl),
  };
}

/** Minimal vendor fixture. */
const VENDOR_ACME = {
  id: 'qbo-vendor-001',
  displayName: 'Acme Supplies',
  email: 'billing@acme.example',
  phone: '555-0100',
  active: true,
  balance: 1250.0,
  taxId: '12-3456789',
};

/** Vendor fixture with no optional fields. */
const VENDOR_MINIMAL = {
  id: 'qbo-vendor-002',
  displayName: 'Beta Services',
  active: false,
};

// ---------------------------------------------------------------------------
// Happy-path tests
// ---------------------------------------------------------------------------

describe('search_vendors — happy path', () => {
  let client: QboClientInterface;

  beforeEach(() => {
    client = makeMockClient(async () => ({
      vendors: [VENDOR_ACME, VENDOR_MINIMAL],
      totalCount: 2,
    }));
  });

  it('returns vendor records with the correct shape', async () => {
    const tool = makeSearchVendorsTool(client);
    const result = await tool.handler({ query: 'acme' }, makeFinanceCtx());

    expect(result.totalCount).toBe(2);
    expect(result.vendors).toHaveLength(2);

    const acme = result.vendors[0];
    expect(acme.id).toBe('qbo-vendor-001');
    expect(acme.displayName).toBe('Acme Supplies');
    expect(acme.email).toBe('billing@acme.example');
    expect(acme.phone).toBe('555-0100');
    expect(acme.active).toBe(true);
    expect(acme.balance).toBe(1250.0);
  });

  it('redacts taxId in the response', async () => {
    const tool = makeSearchVendorsTool(client);
    const result = await tool.handler({ query: 'acme' }, makeFinanceCtx());

    const acme = result.vendors[0];
    // taxId must be present but must NOT equal the raw value
    expect(acme.taxId).toBeDefined();
    expect(acme.taxId).not.toBe('12-3456789');
    // redact() replaces sensitive data with masked characters
    expect(acme.taxId).toMatch(/[*x●]/i);
  });

  it('preserves vendor displayName and contact fields intact (not redacted)', async () => {
    const tool = makeSearchVendorsTool(client);
    const result = await tool.handler({ query: 'acme' }, makeFinanceCtx());

    const acme = result.vendors[0];
    // redact() contract: leaves vendor names and contact info intact
    expect(acme.displayName).toBe('Acme Supplies');
    expect(acme.email).toBe('billing@acme.example');
    expect(acme.phone).toBe('555-0100');
  });

  it('omits optional fields when the vendor has none', async () => {
    const tool = makeSearchVendorsTool(client);
    const result = await tool.handler({ query: 'beta' }, makeFinanceCtx());

    const beta = result.vendors[1];
    expect(beta.id).toBe('qbo-vendor-002');
    expect(beta.displayName).toBe('Beta Services');
    expect(beta.active).toBe(false);
    expect(beta.email).toBeUndefined();
    expect(beta.phone).toBeUndefined();
    expect(beta.balance).toBeUndefined();
    expect(beta.taxId).toBeUndefined();
  });

  it('forwards maxResults to the client', async () => {
    const tool = makeSearchVendorsTool(client);
    await tool.handler({ query: 'acme', maxResults: 5 }, makeFinanceCtx());

    expect(client.searchVendors).toHaveBeenCalledWith(
      expect.objectContaining({ maxResults: 5 }),
    );
  });

  it('defaults maxResults to 20 when not specified', async () => {
    const tool = makeSearchVendorsTool(client);
    await tool.handler({ query: 'acme' }, makeFinanceCtx());

    expect(client.searchVendors).toHaveBeenCalledWith(
      expect.objectContaining({ maxResults: 20 }),
    );
  });
});

// ---------------------------------------------------------------------------
// Empty result
// ---------------------------------------------------------------------------

describe('search_vendors — empty result', () => {
  it('returns an empty vendors array and totalCount 0 when QBO finds nothing', async () => {
    const client = makeMockClient(async () => ({ vendors: [], totalCount: 0 }));
    const tool = makeSearchVendorsTool(client);

    const result = await tool.handler({ query: 'nonexistent vendor xyz' }, makeFinanceCtx());

    expect(result.vendors).toHaveLength(0);
    expect(result.totalCount).toBe(0);
  });

  it('returns totalCount accurately when results are paginated (totalCount > vendors.length)', async () => {
    const client = makeMockClient(async () => ({
      vendors: [VENDOR_MINIMAL],
      totalCount: 47,
    }));
    const tool = makeSearchVendorsTool(client);

    const result = await tool.handler({ query: 'services', maxResults: 1 }, makeFinanceCtx());

    expect(result.vendors).toHaveLength(1);
    expect(result.totalCount).toBe(47);
  });
});

// ---------------------------------------------------------------------------
// Error paths
// ---------------------------------------------------------------------------

describe('search_vendors — error handling', () => {
  it('rethrows unexpected errors from the client unchanged', async () => {
    const client = makeMockClient(async () => {
      throw new Error('Unexpected internal failure');
    });
    const tool = makeSearchVendorsTool(client);

    await expect(tool.handler({ query: 'acme' }, makeFinanceCtx())).rejects.toThrow(
      'Unexpected internal failure',
    );
  });

  it('wraps QboApiError with status code in the thrown message', async () => {
    const client = makeMockClient(async () => {
      throw new QboApiError('Forbidden', 403);
    });
    const tool = makeSearchVendorsTool(client);

    await expect(tool.handler({ query: 'acme' }, makeFinanceCtx())).rejects.toThrow(
      'QBO API error (HTTP 403): Forbidden',
    );
  });

  it('throws a scope error when the context lacks finance:read', async () => {
    const client = makeMockClient(async () => ({ vendors: [], totalCount: 0 }));
    const tool = makeSearchVendorsTool(client);

    // ops-only context — missing finance:read
    const opsCtx = makeFinanceCtx({ scopes: ['ops:read'] });

    await expect(tool.handler({ query: 'acme' }, opsCtx)).rejects.toThrow();
    // client should never be called when scope check fails
    expect(client.searchVendors).not.toHaveBeenCalled();
  });

  it('throws a scope error when the context has no scopes at all', async () => {
    const client = makeMockClient(async () => ({ vendors: [], totalCount: 0 }));
    const tool = makeSearchVendorsTool(client);

    const emptyCtx = makeFinanceCtx({ scopes: [] });

    await expect(tool.handler({ query: 'acme' }, emptyCtx)).rejects.toThrow();
    expect(client.searchVendors).not.toHaveBeenCalled();
  });
});

// ---------------------------------------------------------------------------
// Throttle / retry
// ---------------------------------------------------------------------------

describe('search_vendors — throttle / retry', () => {
  it('surfaces a rate-limit error with retry hint when QBO returns 429 with retryAfter', async () => {
    const client = makeMockClient(async () => {
      throw new QboThrottleError(30);
    });
    const tool = makeSearchVendorsTool(client);

    await expect(tool.handler({ query: 'acme' }, makeFinanceCtx())).rejects.toThrow(
      /rate limit.*retry after 30s/i,
    );
  });

  it('surfaces a rate-limit error without retry hint when QBO omits retryAfter', async () => {
    const client = makeMockClient(async () => {
      throw new QboThrottleError();
    });
    const tool = makeSearchVendorsTool(client);

    const err = await tool
      .handler({ query: 'acme' }, makeFinanceCtx())
      .catch((e: unknown) => e as Error);

    expect(err.message).toMatch(/rate limit/i);
    // No "Retry after Xs" appended
    expect(err.message).not.toMatch(/retry after/i);
  });

  it('does not swallow the error — the caller is responsible for retry logic', async () => {
    // The tool itself does not retry; it propagates so the server layer
    // (or the MCP client) can back off and retry.
    const client = makeMockClient(async () => {
      throw new QboThrottleError(60);
    });
    const tool = makeSearchVendorsTool(client);

    await expect(tool.handler({ query: 'acme' }, makeFinanceCtx())).rejects.toThrow();
    // Called exactly once — no internal retry loop.
    expect(client.searchVendors).toHaveBeenCalledTimes(1);
  });
});

// ---------------------------------------------------------------------------
// Tool metadata
// ---------------------------------------------------------------------------

describe('search_vendors — tool definition', () => {
  it('has the correct name', () => {
    const tool = makeSearchVendorsTool(makeMockClient(async () => ({ vendors: [], totalCount: 0 })));
    expect(tool.name).toBe('search_vendors');
  });

  it('declares finance tier', () => {
    const tool = makeSearchVendorsTool(makeMockClient(async () => ({ vendors: [], totalCount: 0 })));
    expect(tool.tier).toBe('finance');
  });

  it('requires finance:read scope', () => {
    const tool = makeSearchVendorsTool(makeMockClient(async () => ({ vendors: [], totalCount: 0 })));
    expect(tool.requiredScope).toBe('finance:read');
  });

  it('has an inputSchema that marks query as required', () => {
    const tool = makeSearchVendorsTool(makeMockClient(async () => ({ vendors: [], totalCount: 0 })));
    const schema = tool.inputSchema as {
      required: string[];
      properties: Record<string, unknown>;
    };
    expect(schema.required).toContain('query');
    expect(schema.properties).toHaveProperty('query');
    expect(schema.properties).toHaveProperty('maxResults');
  });
});