import { describe, it, expect } from 'vitest'
import {
  normalizePath,
  resolveWritability,
} from '../../../app/services/parameter_writability.js'
import type { DeviceSnapshot } from '../../../app/domain/device/device.js'
import { OnboardingStatus } from '../../../app/domain/device/device.js'
import { DeviceId } from '../../../app/domain/device/device_id.js'
import { ParameterType } from '../../../app/domain/shared/types.js'

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

function makeSnapshot(
  overrides: Partial<DeviceSnapshot> = {}
): DeviceSnapshot {
  return {
    deviceId: new DeviceId('Sagemcom', '10:6f:3f', 'Fast5360', 'SN123'),
    identifier: 'abc123',
    createdAt: new Date(),
    lastSeen: new Date(),
    onboardingStatus: OnboardingStatus.COMPLETED,
    isOnline: false,
    gpnStatus: 'unknown',
    dataModel: 'unknown',
    parameters: [],
    properties: [],
    ...overrides,
  }
}

function param(name: string) {
  return { name, value: null, type: ParameterType.STRING }
}

// ---------------------------------------------------------------------------
// normalizePath
// ---------------------------------------------------------------------------

describe('normalizePath', () => {
  it('leaves paths without numeric segments unchanged', () => {
    expect(normalizePath('Device.DeviceInfo.Manufacturer')).toBe(
      'Device.DeviceInfo.Manufacturer'
    )
  })

  it('replaces a single numeric segment in the middle', () => {
    expect(normalizePath('Device.IP.Interface.1.Enable')).toBe(
      'Device.IP.Interface.{i}.Enable'
    )
  })

  it('replaces a numeric segment at the end', () => {
    expect(normalizePath('Device.IP.Interface.1')).toBe(
      'Device.IP.Interface.{i}'
    )
  })

  it('replaces multiple numeric segments', () => {
    expect(
      normalizePath('Device.IP.Interface.1.IPv4Address.2.IPAddress')
    ).toBe('Device.IP.Interface.{i}.IPv4Address.{i}.IPAddress')
  })

  it('handles large instance numbers', () => {
    expect(normalizePath('Device.WiFi.AccessPoint.99.Security.WEPKey.10.WEPKey')).toBe(
      'Device.WiFi.AccessPoint.{i}.Security.WEPKey.{i}.WEPKey'
    )
  })
})

// ---------------------------------------------------------------------------
// resolveWritability — gpnStatus = 'supported'
// ---------------------------------------------------------------------------

describe('resolveWritability — gpnStatus: supported', () => {
  it('returns writable=true source=live when param is in parameters[]', () => {
    const snapshot = makeSnapshot({
      gpnStatus: 'supported',
      parameters: [param('Device.ManagementServer.URL')],
    })
    expect(resolveWritability(snapshot, 'Device.ManagementServer.URL')).toEqual(
      { writable: true, source: 'live' }
    )
  })

  it('returns writable=false source=live when param is in properties[]', () => {
    const snapshot = makeSnapshot({
      gpnStatus: 'supported',
      properties: [param('Device.DeviceInfo.Manufacturer')],
    })
    expect(resolveWritability(snapshot, 'Device.DeviceInfo.Manufacturer')).toEqual(
      { writable: false, source: 'live' }
    )
  })

  it('falls back to catalog when param is absent from both arrays', () => {
    // Device.ManagementServer.URL is readWrite in TR-181 catalog
    const snapshot = makeSnapshot({ gpnStatus: 'supported' })
    const result = resolveWritability(snapshot, 'Device.ManagementServer.URL')
    // catalog or unknown — but NOT live since arrays are empty
    expect(result.source).not.toBe('live')
  })

  it('parameters[] takes precedence over properties[] when both have the param', () => {
    const snapshot = makeSnapshot({
      gpnStatus: 'supported',
      parameters: [param('Device.ManagementServer.URL')],
      properties: [param('Device.ManagementServer.URL')],
    })
    expect(resolveWritability(snapshot, 'Device.ManagementServer.URL')).toEqual(
      { writable: true, source: 'live' }
    )
  })
})

// ---------------------------------------------------------------------------
// resolveWritability — gpnStatus = 'unsupported'
// ---------------------------------------------------------------------------

describe('resolveWritability — gpnStatus: unsupported', () => {
  it('returns catalog value for a known readOnly TR-181 parameter', () => {
    // Device.DeviceInfo.Manufacturer is readOnly in TR-181
    const snapshot = makeSnapshot({ gpnStatus: 'unsupported' })
    const result = resolveWritability(snapshot, 'Device.DeviceInfo.Manufacturer')
    expect(result).toEqual({ writable: false, source: 'catalog' })
  })

  it('returns catalog value for a known readWrite TR-181 parameter', () => {
    // Device.ManagementServer.URL is readWrite in TR-181
    const snapshot = makeSnapshot({ gpnStatus: 'unsupported' })
    const result = resolveWritability(snapshot, 'Device.ManagementServer.URL')
    expect(result).toEqual({ writable: true, source: 'catalog' })
  })

  it('returns catalog value for an instance path (numeric → {i} normalization)', () => {
    // Device.IP.Interface.{i}.Enable is readWrite in TR-181
    const snapshot = makeSnapshot({ gpnStatus: 'unsupported' })
    const result = resolveWritability(snapshot, 'Device.IP.Interface.1.Enable')
    expect(result).toEqual({ writable: true, source: 'catalog' })
  })

  it('returns writable=true source=default for a path absent from catalog', () => {
    const snapshot = makeSnapshot({ gpnStatus: 'unsupported' })
    const result = resolveWritability(snapshot, 'Device.Vendor.CustomParam.NotInCatalog')
    expect(result).toEqual({ writable: true, source: 'default' })
  })

  it('ignores parameters[] and properties[] (does not use live data)', () => {
    const snapshot = makeSnapshot({
      gpnStatus: 'unsupported',
      parameters: [param('Device.ManagementServer.URL')],
      properties: [param('Device.DeviceInfo.Manufacturer')],
    })
    // Should use catalog, not live arrays
    const result = resolveWritability(snapshot, 'Device.DeviceInfo.Manufacturer')
    expect(result.source).toBe('catalog')
  })
})

// ---------------------------------------------------------------------------
// resolveWritability — gpnStatus = 'unknown'
// ---------------------------------------------------------------------------

describe('resolveWritability — gpnStatus: unknown', () => {
  it('returns catalog value for a known readOnly TR-181 parameter', () => {
    const snapshot = makeSnapshot({ gpnStatus: 'unknown' })
    const result = resolveWritability(snapshot, 'Device.DeviceInfo.Manufacturer')
    expect(result).toEqual({ writable: false, source: 'catalog' })
  })

  it('returns catalog value for a known readWrite TR-181 parameter', () => {
    const snapshot = makeSnapshot({ gpnStatus: 'unknown' })
    const result = resolveWritability(snapshot, 'Device.ManagementServer.URL')
    expect(result).toEqual({ writable: true, source: 'catalog' })
  })

  it('returns writable=null source=unknown for a path absent from catalog', () => {
    const snapshot = makeSnapshot({ gpnStatus: 'unknown' })
    const result = resolveWritability(snapshot, 'Device.Vendor.CustomParam.NotInCatalog')
    expect(result).toEqual({ writable: null, source: 'unknown' })
  })

  it('distinguishes from unsupported: returns null not true for missing params', () => {
    const snapshotUnknown = makeSnapshot({ gpnStatus: 'unknown' })
    const snapshotUnsupported = makeSnapshot({ gpnStatus: 'unsupported' })
    const path = 'Device.Vendor.CustomParam.NotInCatalog'
    expect(resolveWritability(snapshotUnknown, path).writable).toBeNull()
    expect(resolveWritability(snapshotUnsupported, path).writable).toBe(true)
  })
})