import { describe, it } from 'node:test'
import assert from 'node:assert/strict'

import {
  parseSimControl,
  isValidSimControlCommand,
  simControlRejectionSpeech,
  simControlResultSpeech,
} from '~~/shared/utils/simControl'

function expectCommand(input: string) {
  const result = parseSimControl(input)
  assert.equal(result.matched, true, `expected a command for "${input}", got ${JSON.stringify(result)}`)
  return (result as Extract<ReturnType<typeof parseSimControl>, { matched: true }>).command
}

function expectNoMatch(input: string, reason?: string) {
  const result = parseSimControl(input)
  assert.equal(result.matched, false, `expected NO match for "${input}", got ${JSON.stringify(result)}`)
  if (reason) {
    assert.equal((result as Extract<ReturnType<typeof parseSimControl>, { matched: false }>).reason, reason)
  }
}

describe('parseSimControl — approach setup', () => {
  it('parses the canonical roadmap utterance (written form)', () => {
    const cmd = expectCommand('set me up for an approach from 5000 ft to EDDF 07R')
    assert.deepEqual(cmd, {
      type: 'setup_approach',
      airport_icao: 'EDDF',
      runway: '07R',
      altitude_ft: 5000,
    })
  })

  it('parses the same utterance in fully spoken Whisper form', () => {
    const cmd = expectCommand(
      'set me up for an approach from five thousand feet to echo delta delta foxtrot zero seven right',
    )
    assert.deepEqual(cmd, {
      type: 'setup_approach',
      airport_icao: 'EDDF',
      runway: '07R',
      altitude_ft: 5000,
    })
  })

  it('parses an approach without altitude ("runway 26 left" wording)', () => {
    const cmd = expectCommand('set me up for an approach to EDDM runway 26 left')
    assert.deepEqual(cmd, {
      type: 'setup_approach',
      airport_icao: 'EDDM',
      runway: '26L',
    })
  })

  it('parses a final with a distance ("5 mile final")', () => {
    const cmd = expectCommand('put me on a 5 mile final for EDDF 25R')
    assert.deepEqual(cmd, {
      type: 'setup_approach',
      airport_icao: 'EDDF',
      runway: '25R',
      final_distance_nm: 5,
    })
  })

  it('parses a flight-level altitude in an approach setup', () => {
    const cmd = expectCommand('set me up for an approach from flight level 100 to EDDL runway 23')
    assert.deepEqual(cmd, {
      type: 'setup_approach',
      airport_icao: 'EDDL',
      runway: '23',
      altitude_ft: 10000,
    })
  })

  it('rejects an approach altitude without a unit (ambiguous)', () => {
    expectNoMatch('set me up for an approach from 5000 to EDDF 07R', 'missing_unit')
  })

  it('rejects an invalid runway number (40)', () => {
    expectNoMatch('set me up for an approach to EDDF runway 40', 'invalid_runway')
  })

  it('rejects an approach without a runway', () => {
    expectNoMatch('set me up for an approach to EDDF', 'missing_runway')
  })

  it('rejects an approach without an airport', () => {
    expectNoMatch('set me up for an approach runway 25', 'missing_airport')
  })
})

describe('parseSimControl — single-parameter changes', () => {
  it('parses the roadmap altitude wording (bare number is OK — "altitude" names the unit context)', () => {
    const cmd = expectCommand('change my altitude to 8000')
    assert.deepEqual(cmd, { type: 'set_altitude', altitude_ft: 8000 })
  })

  it('parses an altitude given as flight level', () => {
    const cmd = expectCommand('set my altitude to flight level 100')
    assert.deepEqual(cmd, { type: 'set_altitude', altitude_ft: 10000 })
  })

  it('parses a heading change', () => {
    const cmd = expectCommand('change my heading to 270')
    assert.deepEqual(cmd, { type: 'set_heading', heading_deg: 270 })
  })

  it('parses a speed change with unit', () => {
    const cmd = expectCommand('set my speed to 210 knots')
    assert.deepEqual(cmd, { type: 'set_speed', ias_kts: 210 })
  })

  it('parses spoken digits ("change my heading to two seven zero")', () => {
    const cmd = expectCommand('change my heading to two seven zero')
    assert.deepEqual(cmd, { type: 'set_heading', heading_deg: 270 })
  })

  it('rejects a parameter change without a value', () => {
    expectNoMatch('change my altitude', 'missing_value')
  })

  it('rejects an out-of-range altitude', () => {
    expectNoMatch('change my altitude to 80000 feet', 'out_of_range')
  })

  it('rejects an out-of-range heading', () => {
    expectNoMatch('change my heading to 370', 'out_of_range')
  })
})

describe('parseSimControl — must NEVER match ATC dialogue', () => {
  it('does not match a plain ATC readback ("descend to 5000 feet")', () => {
    expectNoMatch('descend to 5000 feet', 'no_intent')
  })

  it('does not match a pilot request ("request descent to flight level 100")', () => {
    expectNoMatch('request descent to flight level 100', 'no_intent')
  })

  it('does not match a clearance readback with runway and callsign', () => {
    expectNoMatch('cleared to land runway 25R Lufthansa 359', 'no_intent')
  })

  it('does not match a squawk instruction ("set squawk 7000")', () => {
    expectNoMatch('set squawk 7000', 'no_intent')
  })

  it('does not match an unanchored altitude mention ("set me up at 8000")', () => {
    expectNoMatch('set me up at 8000')
  })
})

describe('isValidSimControlCommand', () => {
  it('accepts each command type at valid values', () => {
    assert.equal(isValidSimControlCommand({ type: 'set_altitude', altitude_ft: 8000 }), true)
    assert.equal(isValidSimControlCommand({ type: 'set_heading', heading_deg: 270 }), true)
    assert.equal(isValidSimControlCommand({ type: 'set_speed', ias_kts: 210 }), true)
    assert.equal(
      isValidSimControlCommand({ type: 'setup_approach', airport_icao: 'EDDF', runway: '07R' }),
      true,
    )
    assert.equal(
      isValidSimControlCommand({
        type: 'setup_approach',
        airport_icao: 'EDDF',
        runway: '25',
        altitude_ft: 5000,
        final_distance_nm: 5,
      }),
      true,
    )
  })

  it('rejects out-of-range values', () => {
    assert.equal(isValidSimControlCommand({ type: 'set_altitude', altitude_ft: 80000 }), false)
    assert.equal(isValidSimControlCommand({ type: 'set_heading', heading_deg: 400 }), false)
    assert.equal(isValidSimControlCommand({ type: 'set_speed', ias_kts: 10 }), false)
    assert.equal(
      isValidSimControlCommand({ type: 'setup_approach', airport_icao: 'EDDF', runway: '07R', altitude_ft: -1 }),
      false,
    )
  })

  it('rejects malformed shapes', () => {
    assert.equal(isValidSimControlCommand(null), false)
    assert.equal(isValidSimControlCommand({}), false)
    assert.equal(isValidSimControlCommand({ type: 'teleport' }), false)
    assert.equal(isValidSimControlCommand({ type: 'set_altitude', altitude_ft: '8000' }), false)
    assert.equal(
      isValidSimControlCommand({ type: 'setup_approach', airport_icao: 'eddf', runway: '07R' }),
      false,
    )
    assert.equal(
      isValidSimControlCommand({ type: 'setup_approach', airport_icao: 'EDDF', runway: '99' }),
      false,
    )
  })
})

describe('simControlRejectionSpeech', () => {
  it('has a distinct short reply for every non-no_intent reason', () => {
    const reasons = [
      'missing_value', 'missing_unit', 'out_of_range',
      'invalid_runway', 'missing_runway', 'missing_airport',
    ] as const
    const seen = new Set<string>()
    for (const reason of reasons) {
      const speech = simControlRejectionSpeech(reason)
      assert.equal(typeof speech, 'string')
      assert.ok(speech.length > 0)
      seen.add(speech)
    }
    assert.equal(seen.size, reasons.length)
  })
})

describe('simControlResultSpeech', () => {
  it('confirms an approach setup with a final distance', () => {
    const speech = simControlResultSpeech({
      id: '1',
      status: 'ok',
      reason: null,
      command: { type: 'setup_approach', airport_icao: 'EDDF', runway: '07R', final_distance_nm: 5 },
    })
    assert.equal(speech, 'repositioned, 5 mile final runway 07R')
  })

  it('confirms an approach setup without a final distance but with altitude', () => {
    const speech = simControlResultSpeech({
      id: '1',
      status: 'ok',
      reason: null,
      command: { type: 'setup_approach', airport_icao: 'EDDF', runway: '07R', altitude_ft: 5000 },
    })
    assert.equal(speech, 'repositioned, runway 07R approach from 5000 feet')
  })

  it('confirms altitude/heading/speed changes', () => {
    assert.equal(
      simControlResultSpeech({ id: '1', status: 'ok', reason: null, command: { type: 'set_altitude', altitude_ft: 8000 } }),
      'altitude set, 8000 feet',
    )
    assert.equal(
      simControlResultSpeech({ id: '1', status: 'ok', reason: null, command: { type: 'set_heading', heading_deg: 270 } }),
      'heading set, 270',
    )
    assert.equal(
      simControlResultSpeech({ id: '1', status: 'ok', reason: null, command: { type: 'set_speed', ias_kts: 210 } }),
      'speed set, 210 knots',
    )
  })

  it('relays a failure reason from the bridge', () => {
    const speech = simControlResultSpeech({
      id: '1',
      status: 'failed',
      reason: 'aircraft on ground, airborne reposition refused',
      command: { type: 'set_heading', heading_deg: 270 },
    })
    assert.equal(speech, 'unable, aircraft on ground, airborne reposition refused')
  })

  it('falls back to a generic failure line when no reason is given', () => {
    const speech = simControlResultSpeech({
      id: '1', status: 'failed', reason: null, command: { type: 'set_heading', heading_deg: 270 },
    })
    assert.equal(speech, 'unable to comply')
  })

  it('announces an expired (unanswered) command', () => {
    const speech = simControlResultSpeech({
      id: '1', status: 'expired', reason: null, command: { type: 'set_heading', heading_deg: 270 },
    })
    assert.equal(speech, 'bridge did not respond')
  })
})