import { describe, it, expect, vi, beforeEach } from 'vitest'
import type { DeviceRecord } from '../../../../app/domain/device/device_record.js'
import type { InformContext, ReferencesConfig } from '../../../../app/services/references/types.js'
import { DeviceId } from '../../../../app/domain/device/device_id.js'

// This suite exercises ReferenceEngine's provider-loading and dispatch logic in
// isolation from config/references.json (which reflects production settings and
// may legitimately have providers disabled, e.g. wassup when its mock is
// unreachable — see commit 1fc9715). A mutable test fixture (reset per test)
// keeps this suite deterministic regardless of that file's contents, while
// still allowing individual tests to exercise other provider types/configs.
const defaultTestConfig: ReferencesConfig = {
  providers: [
    {
      name: 'wassup',
      type: 'wassup',
      enabled: true,
      url: 'http://wassup-mock:9999',
      timeout: 3000,
      trigger: ['BOOT', 'BOOTSTRAP'],
      resolveBy: 'ip',
      options: {
        service: 'KRMSCO',
        requestedProperties: ['sai', 'spr', 'clo', 'puid', 'utz'],
      },
    },
  ],
}

let testConfig: ReferencesConfig = defaultTestConfig

vi.mock('../../../../app/services/references/config_loader.js', () => ({
  loadReferencesConfig: vi.fn(() => testConfig),
  reloadReferencesConfig: vi.fn(() => testConfig),
}))

// Import AFTER mocking config_loader so ReferenceEngine picks up the test fixture.
const { ReferenceEngine, getReferenceEngine, resetReferenceEngine } =
  await import('../../../../app/services/references/reference_engine.js')

beforeEach(() => {
  testConfig = defaultTestConfig
  resetReferenceEngine()
})

function makeDevice(): DeviceRecord {
  return {
    identifier: 'test-001',
    deviceId: new DeviceId('Sagemcom', 'F8B7FF', 'LB6', 'SN001'),
    properties: [],
    parameters: [],
  }
}

describe('ReferenceEngine (full)', () => {
  it('loads providers from config', () => {
    const engine = new ReferenceEngine()
    const names = engine.getProviderNames()
    expect(names).toContain('wassup')
  })

  it('getProviderConfigs returns all configs', () => {
    const engine = new ReferenceEngine()
    const configs = engine.getProviderConfigs()
    expect(configs.length).toBeGreaterThan(0)
    expect(configs[0].name).toBe('wassup')
  })

  it('resolveAll returns empty when no events match triggers', async () => {
    const engine = new ReferenceEngine()
    const result = await engine.resolveAll(makeDevice(), {
      events: ['6 CONNECTION REQUEST'],
      remoteIp: '10.0.0.1',
      headers: {},
    })
    // CONNECTION_REQUEST is not in the wassup trigger config (only BOOT, BOOTSTRAP)
    expect(result).toEqual([])
  })

  it('resolveAll triggers on BOOT event', async () => {
    const engine = new ReferenceEngine()
    // This will attempt to call the real wassup-mock (which may not be running)
    // We just verify it doesn't crash and returns a result (error or ok)
    const result = await engine.resolveAll(makeDevice(), {
      events: ['1 BOOT'],
      remoteIp: '10.0.0.1',
      headers: {},
    })
    // Either resolved or error (depending on whether mock is up)
    expect(result.length).toBeLessThanOrEqual(1)
    if (result.length > 0) {
      expect(['ok', 'unknown', 'error']).toContain(result[0].status)
      expect(result[0].provider).toBe('wassup')
    }
  })

  it('resolveAll triggers on numeric event "0" (BOOTSTRAP)', async () => {
    const engine = new ReferenceEngine()
    const result = await engine.resolveAll(makeDevice(), {
      events: ['0'],
      remoteIp: '1.2.3.4',
      headers: {},
    })
    expect(result.length).toBeLessThanOrEqual(1)
  })

  it('resolveOne returns null for unknown provider', async () => {
    const engine = new ReferenceEngine()
    const result = await engine.resolveOne('nonexistent', makeDevice(), {
      events: [],
      remoteIp: '',
      headers: {},
    })
    expect(result).toBeNull()
  })

  it('resolveOne calls the named provider', async () => {
    const engine = new ReferenceEngine()
    const result = await engine.resolveOne('wassup', makeDevice(), {
      events: [],
      remoteIp: '10.0.0.1',
      headers: {},
    })
    // Will get an error or unknown since mock may not be running, but provider is called
    if (result) {
      expect(result.provider).toBe('wassup')
      expect(result.resolvedBy).toContain('ip:10.0.0.1')
    }
  })
})

describe('ReferenceEngine — provider loading edge cases', () => {
  it('skips a disabled provider entirely (never registered)', () => {
    testConfig = {
      providers: [
        {
          name: 'wassup',
          type: 'wassup',
          enabled: false,
          trigger: ['BOOT'],
          resolveBy: 'ip',
        },
      ],
    }
    const engine = new ReferenceEngine()
    expect(engine.getProviderNames()).toEqual([])
    // Config is still tracked even if the provider itself isn't instantiated
    expect(engine.getProviderConfigs()).toHaveLength(1)
  })

  it('does not register a provider for unimplemented type "http-json"', () => {
    testConfig = {
      providers: [
        { name: 'crm', type: 'http-json', enabled: true, trigger: ['BOOT'], resolveBy: 'ip' },
      ],
    }
    const engine = new ReferenceEngine()
    expect(engine.getProviderNames()).toEqual([])
  })

  it('does not register a provider for unimplemented type "http-properties"', () => {
    testConfig = {
      providers: [
        { name: 'noc', type: 'http-properties', enabled: true, trigger: ['BOOT'], resolveBy: 'ip' },
      ],
    }
    const engine = new ReferenceEngine()
    expect(engine.getProviderNames()).toEqual([])
  })

  it('does not register a provider for unimplemented type "static"', () => {
    testConfig = {
      providers: [
        { name: 'fixed', type: 'static', enabled: true, trigger: ['BOOT'], resolveBy: 'ip' },
      ],
    }
    const engine = new ReferenceEngine()
    expect(engine.getProviderNames()).toEqual([])
  })

  it('does not register a provider for an unknown/unrecognized type', () => {
    testConfig = {
      providers: [
        {
          name: 'weird',
          type: 'unknown-type' as any,
          enabled: true,
          trigger: ['BOOT'],
          resolveBy: 'ip',
        },
      ],
    }
    const engine = new ReferenceEngine()
    expect(engine.getProviderNames()).toEqual([])
  })

  it('handles an empty provider list gracefully', () => {
    testConfig = { providers: [] }
    const engine = new ReferenceEngine()
    expect(engine.getProviderNames()).toEqual([])
    expect(engine.getProviderConfigs()).toEqual([])
  })
})

describe('ReferenceEngine.getApplicableProviders — orphan provider (config removed)', () => {
  it('excludes a provider whose config entry is no longer present', async () => {
    const engine = new ReferenceEngine()
    // Simulate a stale in-memory provider whose config was removed at runtime
    ;(engine as any).configs = []

    const result = await engine.resolveAll(makeDevice(), {
      events: ['1 BOOT'],
      remoteIp: '10.0.0.1',
      headers: {},
    })

    expect(result).toEqual([])
  })
})

describe('ReferenceEngine.resolveAll — provider rejection handling', () => {
  it('logs and skips a provider whose resolve() promise rejects', async () => {
    const engine = new ReferenceEngine()
    const provider = (engine as any).providers[0]
    vi.spyOn(provider, 'resolve').mockRejectedValue(new Error('boom'))

    const result = await engine.resolveAll(makeDevice(), {
      events: ['1 BOOT'],
      remoteIp: '10.0.0.1',
      headers: {},
    })

    expect(result).toEqual([])
  })

  it('excludes a fulfilled-but-null resolution from the results', async () => {
    const engine = new ReferenceEngine()
    const provider = (engine as any).providers[0]
    vi.spyOn(provider, 'resolve').mockResolvedValue(null)

    const result = await engine.resolveAll(makeDevice(), {
      events: ['1 BOOT'],
      remoteIp: '10.0.0.1',
      headers: {},
    })

    expect(result).toEqual([])
  })

  it('includes a fulfilled resolution in the results', async () => {
    const engine = new ReferenceEngine()
    const provider = (engine as any).providers[0]
    const resolved = {
      provider: 'wassup',
      resolvedAt: new Date(),
      resolvedBy: 'ip:10.0.0.1',
      status: 'ok' as const,
      properties: { sai: 'value' },
    }
    vi.spyOn(provider, 'resolve').mockResolvedValue(resolved)

    const result = await engine.resolveAll(makeDevice(), {
      events: ['1 BOOT'],
      remoteIp: '10.0.0.1',
      headers: {},
    })

    expect(result).toEqual([resolved])
  })
})

describe('getReferenceEngine / resetReferenceEngine — singleton lifecycle', () => {
  it('returns the same instance on repeated calls', () => {
    const a = getReferenceEngine()
    const b = getReferenceEngine()
    expect(a).toBe(b)
  })

  it('resetReferenceEngine forces a new instance to be created next call', () => {
    const a = getReferenceEngine()
    resetReferenceEngine()
    const b = getReferenceEngine()
    expect(a).not.toBe(b)
  })
})