/**
 * tests/AuthFetch.test.ts
 */
import {
  CompletedProtoWallet,
  PrivateKey,
  RequestedCertificateTypeIDAndFieldList,
  Utils,
  AuthFetch
} from '@bsv/sdk'
import { Server } from 'http'
import { startServer } from './testExpressServer'
import { MockWallet } from './MockWallet'

export interface RequestedCertificateSet {
  certifiers: string[]
  types: RequestedCertificateTypeIDAndFieldList
}

// Increase global timeout for async ops
jest.setTimeout(30000)

describe('AuthFetch and AuthExpress Integration Tests', () => {
  const privKey = PrivateKey.fromRandom()
  let server: Server
  beforeAll(async () => {
    server = startServer(3000) // Returns un-listened server
    await new Promise<void>((resolve, reject) => {
      server.once('listening', () => {
        console.log('Test server is running on http://localhost:3000')
        resolve()
      })
      server.once('error', reject)
      server.listen(3000)
    })
  })

  afterAll(async () => {
    if (server && server.listening) {
      await new Promise<void>((resolve, reject) => {
        server.once('close', () => {
          console.log('Test server stopped')
          resolve()
        })
        server.once('error', reject)
        if (typeof server.closeAllConnections === 'function') {
          server.closeAllConnections()
        }
        server.close()
      })
    }
  })

  // --------------------------------------------------------------------------
  // Main Tests
  // --------------------------------------------------------------------------

  test('Test 1: Simple POST request with JSON', async () => {
    const walletWithRequests = new MockWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/other-endpoint',
      {
        method: 'POST',
        headers: {
          'content-type': 'application/json'
        },
        body: JSON.stringify({ message: 'Hello from JSON!' })
      }
    )
    expect(result.status).toBe(200)
    const jsonResponse = await result.json()
    console.log(jsonResponse)
    expect(jsonResponse).toBeDefined()
  })
  test('Test 1b: Simple POST request with JSON resulting in 500 error code', async () => {
    const walletWithRequests = new MockWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/error-500',
      {
        method: 'POST',
        headers: {
          'content-type': 'application/json'
        },
        body: JSON.stringify({ message: 'Hello from JSON!' })
      }
    )
    expect(result.status).toBe(500)
    const jsonResponse = await result.json()
    console.log(jsonResponse)
    expect(jsonResponse).toHaveProperty('code', 'ERR_BAD_THING')
  })

  test('Test 2: POST request with URL-encoded data', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/other-endpoint',
      {
        method: 'POST',
        headers: {
          'content-type': 'application/x-www-form-urlencoded',
          'x-bsv-test': 'this is a test header'
        },
        body: new URLSearchParams({ message: 'hello!', type: 'form-data' }).toString()
      }
    )
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  test('Test 3: POST request with plain text', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/other-endpoint',
      {
        method: 'POST',
        headers: {
          'content-type': 'text/plain',
          'x-bsv-test': 'this is a test header'
        },
        body: 'Hello, this is a plain text message!'
      }
    )
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  test('Test 4: POST request with binary data', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/other-endpoint',
      {
        method: 'POST',
        headers: {
          'content-type': 'application/octet-stream',
          'x-bsv-test': 'this is a test header'
        },
        body: Utils.toArray('Hello from binary!')
      }
    )
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  test('Test 5: Simple GET request', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch('http://localhost:3000/')
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  // TODO: Requires modifying the test server to support this.
  // test('Test 6: Fetch and save video', async () => {
  //   const walletWithRequests = new CompletedProtoWallet(privKey)
  //   const authFetch = new AuthFetch(walletWithRequests)
  //   const videoResponse = await authFetch.fetch('http://localhost:3000/video')
  //   expect(videoResponse.status).toBe(200)
  //   const arrayBuffer = await videoResponse.arrayBuffer()
  //   const buffer = Buffer.from(arrayBuffer)
  //   const outputPath = path.join(__dirname, 'downloaded_video.mp4')
  //   fs.writeFileSync(outputPath, buffer)
  //   expect(fs.existsSync(outputPath)).toBe(true)
  //   const stats = fs.statSync(outputPath)
  //   expect(stats.size).toBeGreaterThan(0)
  // })

  test('Test 7: PUT request with JSON', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/put-endpoint',
      {
        method: 'PUT',
        headers: {
          'content-type': 'application/json',
          'x-bsv-test': 'this is a test header'
        },
        body: JSON.stringify({ key: 'value', action: 'update' })
      }
    )
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  test('Test 8: DELETE request', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/delete-endpoint',
      {
        method: 'DELETE',
        headers: {
          'x-bsv-test': 'this is a test header'
        }
      }
    )
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  test('Test 9: Large binary upload', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const largeBuffer = Utils.toArray('Hello from a large upload test')
    const result = await authFetch.fetch('http://localhost:3000/large-upload', {
      method: 'POST',
      headers: {
        'content-type': 'application/octet-stream'
      },
      body: largeBuffer
    })
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  test('Test 10: Query parameters', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/query-endpoint?param1=value1&param2=value2'
    )
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  test('Test 11: Custom headers', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch('http://localhost:3000/custom-headers', {
      method: 'GET',
      headers: {
        'x-bsv-custom-header': 'CustomHeaderValue'
      }
    })
    expect(result.status).toBe(200)
    const textResponse = await result.text()
    expect(textResponse).toBeDefined()
  })

  // --------------------------------------------------------------------------
  // Edge-Case Tests
  // --------------------------------------------------------------------------

  test('Edge Case A: No Content-Type', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    await expect(
      authFetch.fetch('http://localhost:3000/no-content-type-endpoint', {
        method: 'POST',
        // Intentionally no 'content-type' header
        body: 'This should fail if your code requires Content-Type for POST.'
      })
    ).rejects.toThrow()
  })

  test('Edge Case B: application json content with undefined body', async () => {
    const walletWithRequests = new MockWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/other-endpoint',
      {
        method: 'POST',
        headers: {
          'content-type': 'application/json'
        },
        body: undefined
      }
    )
    expect(result.status).toBe(200)
    const jsonResponse = await result.json()
    console.log(jsonResponse)
    expect(jsonResponse).toBeDefined()
  })

  test('Edge Case C: application json content with body of type object', async () => {
    const walletWithRequests = new MockWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/other-endpoint',
      {
        method: 'POST',
        headers: {
          'content-type': 'application/json'
        },
        body: {}
      }
    )
    expect(result.status).toBe(200)
    const jsonResponse = await result.json()
    console.log(jsonResponse)
    expect(jsonResponse).toBeDefined()
  })

  // --------------------------------------------------------------------------
  // New Test for Restarting Server Mid-Test with Two AuthFetch Instances
  // --------------------------------------------------------------------------
  test('Test 12: Two AuthFetch instances from the same identity key (restart server mid-test)', async () => {
    // Use separate wallet instances with the same identity key.
    const wallet1 = new MockWallet(privKey)
    const authFetch1 = new AuthFetch(wallet1)
    const resp1 = await authFetch1.fetch('http://localhost:3000/custom-headers', {
      method: 'GET',
      headers: { 'x-bsv-custom-header': 'CustomHeaderValue' }
    })
    expect(resp1.status).toBe(200)
    const data1 = await resp1.json()
    console.log('Data from first AuthFetch instance (before server restart):', data1)
    expect(data1).toBeDefined()

    // Close the server and wait for it to shut down.
    await new Promise<void>((resolve, reject) => {
      server.once('close', () => {
        console.log('Server closed mid-test')
        resolve()
      })
      server.once('error', reject)
      if (typeof server.closeAllConnections === 'function') {
        server.closeAllConnections()
      }
      server.close()
    })

    // Restart the server and assign it back to the 'server' variable.
    server = startServer(3000)
    await new Promise<void>((resolve, reject) => {
      server.once('listening', () => {
        console.log('Server restarted for second half of the test...')
        resolve()
      })
      server.once('error', (err) => {
        reject(err)
      })
      server.listen(3000) // Critical fix: Call listen after listeners
    })

    // Add a short delay to ensure the server is fully ready.
    await new Promise((resolve) => setTimeout(resolve, 200))

    // Create a fresh AuthFetch instance using a new wallet instance (same identity key).
    const wallet2 = new MockWallet(privKey)
    const authFetch2 = new AuthFetch(wallet2)
    const resp2 = await authFetch2.fetch('http://localhost:3000/custom-headers', {
      method: 'GET',
      headers: { 'x-bsv-custom-header': 'CustomHeaderValue' }
    })
    expect(resp2.status).toBe(200)
    const data2 = await resp2.json()
    console.log('Data from second AuthFetch instance (after server restart):', data2)
    expect(data2).toBeDefined()
  })

  test('Test 13: POST request with JSON header containing charset injection', async () => {
    const walletWithRequests = new CompletedProtoWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)
    const result = await authFetch.fetch(
      'http://localhost:3000/other-endpoint',
      {
        method: 'POST',
        headers: {
          'content-type': 'application/json; charset=utf-8'
        },
        body: JSON.stringify({ message: 'Testing charset injection normalization!' })
      }
    )
    expect(result.status).toBe(200)
    const jsonResponse = await result.json()
    console.log(jsonResponse)
    expect(jsonResponse).toBeDefined()
  })

  test('Test 14: Stale-session recovery after server-side session reset', async () => {
    const walletWithRequests = new MockWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)

    // 1. Establish a session with a successful request
    const firstResponse = await authFetch.fetch('http://localhost:3000/custom-headers', {
      method: 'GET',
      headers: { 'x-bsv-custom-header': 'CustomHeaderValue' }
    })
    expect(firstResponse.status).toBe(200)

    // 2. Clear server-side sessions (simulates server restart / scaling event)
    const clearResponse = await fetch('http://localhost:3000/__clear-auth-sessions', { method: 'POST' })
    expect(clearResponse.status).toBe(200)

    // 3. Second request should recover automatically (re-handshake) instead of hanging
    const secondRequestPromise = authFetch.fetch('http://localhost:3000/custom-headers', {
      method: 'GET',
      headers: { 'x-bsv-custom-header': 'CustomHeaderValue' }
    })

    const outcome = await Promise.race([
      secondRequestPromise
        .then((res) => ({ tag: 'resolved' as const, response: res }))
        .catch((error: unknown) => {
          if (error instanceof Error) return { tag: 'rejected' as const, message: error.message }
          return { tag: 'rejected' as const, message: String(error) }
        }),
      new Promise<{ tag: 'timeout' }>(resolve => {
        const t = setTimeout(() => resolve({ tag: 'timeout' }), 10000)
        if (typeof t.unref === 'function') t.unref()
      })
    ])

    // Should NOT timeout — the client should detect the stale session and retry
    expect(outcome.tag).not.toBe('timeout')

    // Should recover and succeed
    expect(outcome.tag).toBe('resolved')
    if (outcome.tag === 'resolved') {
      expect(outcome.response.status).toBe(200)
    }
  })

  test('Test 15: Multiple sequential requests survive a mid-session server reset', async () => {
    const walletWithRequests = new MockWallet(privKey)
    const authFetch = new AuthFetch(walletWithRequests)

    // First request — establishes session
    const r1 = await authFetch.fetch('http://localhost:3000/other-endpoint', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ message: 'before reset' })
    })
    expect(r1.status).toBe(200)

    // Clear sessions
    const clearResponse = await fetch('http://localhost:3000/__clear-auth-sessions', { method: 'POST' })
    expect(clearResponse.status).toBe(200)

    // Second request — should recover via re-handshake
    const r2 = await authFetch.fetch('http://localhost:3000/other-endpoint', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ message: 'after reset' })
    })
    expect(r2.status).toBe(200)
    const body2 = await r2.json()
    expect(body2).toBeDefined()

    // Third request — should work on the fresh session
    const r3 = await authFetch.fetch('http://localhost:3000/other-endpoint', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ message: 'after recovery' })
    })
    expect(r3.status).toBe(200)
    const body3 = await r3.json()
    expect(body3).toBeDefined()
  })
})