import { mkdtemp, mkdir, rm, writeFile } from 'fs/promises'
import { tmpdir } from 'os'
import { join } from 'path'
import { describe, it, expect, beforeAll, afterEach } from 'vitest'

import { getModelCosts, getShortModelName, calculateCost, loadPricing, setModelAliases } from '../src/models.js'

beforeAll(async () => {
  await loadPricing()
})

afterEach(() => setModelAliases({}))

describe('getModelCosts', () => {
  it('does not match short canonical against longer pricing key', () => {
    const costs = getModelCosts('gpt-4')
    if (costs) {
      expect(costs.inputCostPerToken).not.toBe(2.5e-6)
    }
  })

  it('returns correct pricing for gpt-4o vs gpt-4o-mini', () => {
    const mini = getModelCosts('gpt-4o-mini')
    const full = getModelCosts('gpt-4o')
    expect(mini).not.toBeNull()
    expect(full).not.toBeNull()
    expect(mini!.inputCostPerToken).toBeLessThan(full!.inputCostPerToken)
  })

  it('returns fallback pricing for known Claude models', () => {
    const costs = getModelCosts('claude-opus-4-6-20260205')
    expect(costs).not.toBeNull()
    expect(costs!.inputCostPerToken).toBe(5e-6)
  })
})

describe('getShortModelName', () => {
  it('maps gpt-4o-mini correctly (not gpt-4o)', () => {
    expect(getShortModelName('gpt-4o-mini-2024-07-18')).toBe('GPT-4o Mini')
  })

  it('maps gpt-4o correctly', () => {
    expect(getShortModelName('gpt-4o-2024-08-06')).toBe('GPT-4o')
  })

  it('maps gpt-4.1-mini correctly (not gpt-4.1)', () => {
    expect(getShortModelName('gpt-4.1-mini-2025-04-14')).toBe('GPT-4.1 Mini')
  })

  it('maps gpt-5.4-mini correctly (not gpt-5.4)', () => {
    expect(getShortModelName('gpt-5.4-mini')).toBe('GPT-5.4 Mini')
  })

  it('maps claude-opus-4-6 with date suffix', () => {
    expect(getShortModelName('claude-opus-4-6-20260205')).toBe('Opus 4.6')
  })

  // Regression for #420: claude-opus-4-8 must get its own line, not collapse
  // into the generic "Opus 4" bucket via the shorter claude-opus-4 prefix.
  it('maps claude-opus-4-8 to its own line (not Opus 4)', () => {
    expect(getShortModelName('claude-opus-4-8')).toBe('Opus 4.8')
  })

  // A future version is derived from the id with no hand-maintained entry.
  it('derives an unreleased claude version with no SHORT_NAMES entry', () => {
    expect(getShortModelName('claude-sonnet-5-2')).toBe('Sonnet 5.2')
    expect(getShortModelName('claude-haiku-5')).toBe('Haiku 5')
    expect(getShortModelName('claude-opus-9-9-20300101')).toBe('Opus 9.9')
  })
})

describe('claude-fable-5 pricing + name', () => {
  it('prices at $10/M input, $50/M output via models.dev/OpenRouter gap-fill', () => {
    expect(calculateCost('claude-fable-5', 1_000_000, 0, 0, 0, 0)).toBeCloseTo(10, 6)
    expect(calculateCost('claude-fable-5', 0, 1_000_000, 0, 0, 0)).toBeCloseTo(50, 6)
  })
  it('shows its own display name', () => {
    expect(getShortModelName('claude-fable-5')).toBe('Fable 5')
  })
})

describe('builtin aliases - getModelCosts', () => {
  it('resolves anthropic--claude-4.6-opus', () => {
    expect(getModelCosts('anthropic--claude-4.6-opus')).not.toBeNull()
  })

  it('resolves anthropic--claude-4.6-sonnet', () => {
    expect(getModelCosts('anthropic--claude-4.6-sonnet')).not.toBeNull()
  })

  it('resolves anthropic--claude-4.5-opus', () => {
    expect(getModelCosts('anthropic--claude-4.5-opus')).not.toBeNull()
  })

  it('resolves anthropic--claude-4.5-sonnet', () => {
    expect(getModelCosts('anthropic--claude-4.5-sonnet')).not.toBeNull()
  })

  it('resolves anthropic--claude-4.5-haiku', () => {
    expect(getModelCosts('anthropic--claude-4.5-haiku')).not.toBeNull()
  })

  it('resolves double-wrapped anthropic/anthropic--claude-4.6-opus', () => {
    expect(getModelCosts('anthropic/anthropic--claude-4.6-opus')).not.toBeNull()
  })

  it('resolves double-wrapped anthropic/anthropic--claude-4.6-sonnet', () => {
    expect(getModelCosts('anthropic/anthropic--claude-4.6-sonnet')).not.toBeNull()
  })

  it('resolves double-wrapped anthropic/anthropic--claude-4.5-haiku', () => {
    expect(getModelCosts('anthropic/anthropic--claude-4.5-haiku')).not.toBeNull()
  })

  it('OMP opus resolves to same pricing as canonical claude-opus-4-6', () => {
    expect(getModelCosts('anthropic--claude-4.6-opus')).toEqual(getModelCosts('claude-opus-4-6'))
  })

  it('OMP sonnet resolves to same pricing as canonical claude-sonnet-4-6', () => {
    expect(getModelCosts('anthropic--claude-4.6-sonnet')).toEqual(getModelCosts('claude-sonnet-4-6'))
  })

  it('OMP haiku resolves to same pricing as canonical claude-haiku-4-5', () => {
    expect(getModelCosts('anthropic--claude-4.5-haiku')).toEqual(getModelCosts('claude-haiku-4-5'))
  })
})

describe('builtin aliases - getShortModelName', () => {
  it('anthropic--claude-4.6-opus -> Opus 4.6', () => {
    expect(getShortModelName('anthropic--claude-4.6-opus')).toBe('Opus 4.6')
  })

  it('anthropic--claude-4.6-sonnet -> Sonnet 4.6', () => {
    expect(getShortModelName('anthropic--claude-4.6-sonnet')).toBe('Sonnet 4.6')
  })

  it('anthropic--claude-4.5-opus -> Opus 4.5', () => {
    expect(getShortModelName('anthropic--claude-4.5-opus')).toBe('Opus 4.5')
  })

  it('anthropic--claude-4.5-sonnet -> Sonnet 4.5', () => {
    expect(getShortModelName('anthropic--claude-4.5-sonnet')).toBe('Sonnet 4.5')
  })

  it('anthropic--claude-4.5-haiku -> Haiku 4.5', () => {
    expect(getShortModelName('anthropic--claude-4.5-haiku')).toBe('Haiku 4.5')
  })

  it('anthropic/anthropic--claude-4.6-opus -> Opus 4.6', () => {
    expect(getShortModelName('anthropic/anthropic--claude-4.6-opus')).toBe('Opus 4.6')
  })
})

describe('Antigravity Gemini 3.5 Flash variants resolve to pricing', () => {
  const variants = [
    'gemini-3.5-flash',
    'gemini-3.5-flash-high',
    'gemini-3.5-flash-medium',
    'gemini-3.5-flash-low',
    'Gemini 3.5 Flash (High)',
  ]

  for (const variant of variants) {
    it(`${variant} resolves to Gemini 3.5 Flash`, () => {
      expect(getModelCosts(variant)).toEqual(getModelCosts('gemini-3.5-flash'))
      expect(getShortModelName(variant)).toBe('Gemini 3.5 Flash')
    })
  }

  it('calculates non-zero cost for high thinking labels', () => {
    expect(calculateCost('gemini-3.5-flash-high', 1000, 100, 0, 0, 0)).toBeGreaterThan(0)
  })
})

describe('user aliases via setModelAliases', () => {
  it('user alias resolves for getModelCosts', () => {
    setModelAliases({ 'my-internal-model': 'claude-sonnet-4-6' })
    expect(getModelCosts('my-internal-model')).toEqual(getModelCosts('claude-sonnet-4-6'))
  })

  it('user alias resolves for getShortModelName', () => {
    setModelAliases({ 'my-internal-model': 'claude-opus-4-6' })
    expect(getShortModelName('my-internal-model')).toBe('Opus 4.6')
  })

  it('user alias overrides builtin', () => {
    setModelAliases({ 'anthropic--claude-4.6-opus': 'claude-sonnet-4-5' })
    expect(getModelCosts('anthropic--claude-4.6-opus')).toEqual(getModelCosts('claude-sonnet-4-5'))
  })

  it('resetting aliases restores builtins', () => {
    setModelAliases({ 'anthropic--claude-4.6-opus': 'claude-sonnet-4-5' })
    setModelAliases({})
    expect(getModelCosts('anthropic--claude-4.6-opus')).toEqual(getModelCosts('claude-opus-4-6'))
  })
})

describe('calculateCost - OMP names produce non-zero cost', () => {
  it('calculates cost for anthropic--claude-4.6-opus', () => {
    expect(calculateCost('anthropic--claude-4.6-opus', 1000, 200, 0, 0, 0)).toBeGreaterThan(0)
  })

  it('calculates cost for anthropic/anthropic--claude-4.6-sonnet', () => {
    expect(calculateCost('anthropic/anthropic--claude-4.6-sonnet', 1000, 200, 0, 0, 0)).toBeGreaterThan(0)
  })
})

describe('Warp Claude variants resolve to pricing', () => {
  const cases: Array<[string, string]> = [
    ['claude-4-6-sonnet-high', 'claude-sonnet-4-6'],
    ['claude-4-6-sonnet-low', 'claude-sonnet-4-6'],
    ['claude-4-6-sonnet-medium', 'claude-sonnet-4-6'],
    ['claude-4-6-sonnet-high-fast', 'claude-sonnet-4-6'],
    ['claude-4-7-opus-xhigh', 'claude-opus-4-7'],
    ['claude-4-7-opus-xhigh-fast', 'claude-opus-4-7'],
  ]

  for (const [input, expectedAlias] of cases) {
    it(`${input} resolves to ${expectedAlias} pricing`, () => {
      const costs = getModelCosts(input)
      expect(costs).not.toBeNull()
      expect(costs!.inputCostPerToken).toBeGreaterThan(0)
      const expected = getModelCosts(expectedAlias)
      expect(expected).not.toBeNull()
      expect(costs!.inputCostPerToken).toBe(expected!.inputCostPerToken)
      expect(costs!.outputCostPerToken).toBe(expected!.outputCostPerToken)
    })

    it(`${input} calculates non-zero cost`, () => {
      expect(calculateCost(input, 1000, 200, 0, 0, 0)).toBeGreaterThan(0)
    })
  }
})

describe('calculateCost - Claude cache write durations', () => {
  it('prices 1-hour cache writes at 1.6x the 5-minute cache write rate', () => {
    const fiveMinute = calculateCost('claude-opus-4-7', 0, 0, 1_000_000, 0, 0)
    const oneHour = calculateCost('claude-opus-4-7', 0, 0, 1_000_000, 0, 0, 'standard', 1_000_000)
    const mixed = calculateCost('claude-opus-4-7', 0, 0, 100_000, 0, 0, 'standard', 60_000)

    expect(fiveMinute).toBeCloseTo(6.25, 6)
    expect(oneHour).toBeCloseTo(10, 6)
    expect(mixed).toBeCloseTo(0.85, 6)
  })
})

describe('existing model names still resolve', () => {
  it('canonical claude-opus-4-6', () => {
    expect(getModelCosts('claude-opus-4-6')).not.toBeNull()
  })

  it('canonical claude-sonnet-4-5', () => {
    expect(getModelCosts('claude-sonnet-4-5')).not.toBeNull()
  })

  it('date-stamped claude-sonnet-4-20250514', () => {
    expect(getModelCosts('claude-sonnet-4-20250514')).not.toBeNull()
  })

  it('pinned claude-sonnet-4-6@20250929', () => {
    expect(getModelCosts('claude-sonnet-4-6@20250929')).not.toBeNull()
  })

  it('anthropic/-prefixed anthropic/claude-opus-4-6', () => {
    expect(getModelCosts('anthropic/claude-opus-4-6')).not.toBeNull()
  })

  // #420: 4.8 has its own LiteLLM pricing tier ($5/$25), so it must not fall
  // through the prefix match to the older, 3x-pricier claude-opus-4 ($15/$75).
  it('claude-opus-4-8 prices at its own tier, not original claude-opus-4', () => {
    const v48 = getModelCosts('claude-opus-4-8')
    expect(v48).not.toBeNull()
    // $5/$25 per M tokens — the 4.6/4.7 tier, not the original opus-4 $15/$75.
    expect(v48!.inputCostPerToken).toBeCloseTo(0.000005, 12)
    expect(v48!.outputCostPerToken).toBeCloseTo(0.000025, 12)
    expect(v48!.inputCostPerToken).not.toEqual(getModelCosts('claude-opus-4')!.inputCostPerToken)
  })
})

// Issue #159: every model name Cursor emits in its SQLite database must
// resolve to a non-zero pricing entry, otherwise the dashboard shows $0 for
// that model. Each case asserts the resolved pricing identity matches the
// pricing of the expected canonical key, so an accidental alias swap (e.g.
// `claude-4.6-opus` aliased to a haiku entry) fails the test even though
// haiku also has positive pricing.
describe('Cursor model variants resolve to pricing', () => {
  const cases: Array<[string, string]> = [
    // Sonnet family
    ['claude-4-sonnet', 'claude-sonnet-4'],
    ['claude-4-sonnet-1m', 'claude-sonnet-4'],
    ['claude-4-sonnet-thinking', 'claude-sonnet-4-5'],
    ['claude-4.5-sonnet', 'claude-sonnet-4-5'],
    ['claude-4.5-sonnet-thinking', 'claude-sonnet-4-5'],
    ['claude-4.6-sonnet', 'claude-sonnet-4-6'],
    ['claude-4.6-sonnet-high', 'claude-sonnet-4-6'],
    ['claude-4.6-sonnet-low', 'claude-sonnet-4-6'],
    ['claude-4.6-sonnet-thinking', 'claude-sonnet-4-6'],
    ['claude-4.6-sonnet-high-thinking', 'claude-sonnet-4-6'],
    // Opus family
    ['claude-4-opus', 'claude-opus-4'],
    ['claude-4.5-opus', 'claude-opus-4-5'],
    ['claude-4.5-opus-high', 'claude-opus-4-5'],
    ['claude-4.5-opus-low', 'claude-opus-4-5'],
    ['claude-4.5-opus-medium', 'claude-opus-4-5'],
    ['claude-4.5-opus-high-thinking', 'claude-opus-4-5'],
    ['claude-4.6-opus', 'claude-opus-4-6'],
    ['claude-4.6-opus-fast-mode', 'claude-opus-4-6'],
    ['claude-4.6-opus-high', 'claude-opus-4-6'],
    ['claude-4.6-opus-low', 'claude-opus-4-6'],
    ['claude-4.6-opus-medium', 'claude-opus-4-6'],
    ['claude-4.6-opus-high-thinking', 'claude-opus-4-6'],
    ['claude-4.7-opus', 'claude-opus-4-7'],
    ['claude-opus-4-7-thinking-high', 'claude-opus-4-7'],
    // Haiku family
    ['claude-4.5-haiku', 'claude-haiku-4-5'],
    ['claude-4.6-haiku', 'claude-haiku-4-5'],
    // Cursor house models
    ['composer-1', 'claude-sonnet-4-5'],
    ['composer-1.5', 'claude-sonnet-4-5'],
    ['composer-2', 'claude-sonnet-4-6'],
    ['cursor-auto', 'claude-sonnet-4-5'],
    // OpenAI variants Cursor emits
    ['gpt-5', 'gpt-5'],
    ['gpt-5-fast', 'gpt-5'],
    ['gpt-5.2', 'gpt-5.2'],
    ['gpt-5.2-low', 'gpt-5'],
    // Direct LiteLLM hits where no alias is required
    ['grok-code-fast-1', 'grok-code-fast-1'],
    ['gemini-3-pro', 'gemini-3-pro-preview'],
  ]

  for (const [input, expectedAlias] of cases) {
    it(`${input} resolves to ${expectedAlias} pricing`, () => {
      const costs = getModelCosts(input)
      expect(costs, `${input} should resolve to pricing (and not produce $0 in the dashboard)`).not.toBeNull()
      expect(costs!.inputCostPerToken).toBeGreaterThan(0)
      expect(costs!.outputCostPerToken).toBeGreaterThan(0)
      const expected = getModelCosts(expectedAlias)
      expect(expected, `expected target ${expectedAlias} should itself resolve`).not.toBeNull()
      // Identity check: the alias must produce the SAME pricing object as
      // the canonical key, not just any non-zero pricing. Catches drift
      // where a future edit re-points an alias at a wrong-but-positive entry.
      expect(costs!.inputCostPerToken).toBe(expected!.inputCostPerToken)
      expect(costs!.outputCostPerToken).toBe(expected!.outputCostPerToken)
    })
  }
})

// Regression: LiteLLM ships `snowflake/claude-4-opus` ($5/M, a gateway rate),
// which the bundler strips to a bare `claude-4-opus` snapshot key. Without the
// alias-precedence guard in getModelCosts, that bare reseller key shadows the
// curated alias `claude-4-opus -> claude-opus-4` and mis-prices Opus 4 at a
// third of its official list price. Pin the official number so a re-shadowing
// fails loudly rather than silently under-reporting spend.
describe('alias precedence over stripped reseller keys', () => {
  it('claude-4-opus resolves to the official Opus 4 list price, not a gateway discount', () => {
    const aliased = getModelCosts('claude-4-opus')
    const canonical = getModelCosts('claude-opus-4')
    expect(aliased).not.toBeNull()
    expect(canonical).not.toBeNull()
    expect(aliased!.inputCostPerToken).toBe(canonical!.inputCostPerToken)
    expect(aliased!.outputCostPerToken).toBe(canonical!.outputCostPerToken)
    expect(aliased!.inputCostPerToken).toBe(15e-6)
    expect(aliased!.outputCostPerToken).toBe(75e-6)
  })

  it('the explicit provider prefix is still honored for the gateway rate', () => {
    // The guard fires only for the bare name; a fully-qualified gateway id must
    // still return that gateway's own price when LiteLLM publishes one.
    const gateway = getModelCosts('snowflake/claude-4-opus')
    const bare = getModelCosts('claude-4-opus')
    expect(gateway).not.toBeNull()
    expect(gateway!.inputCostPerToken).toBeLessThan(bare!.inputCostPerToken)
  })
})

// The case-insensitive index that lets `MiniMax-M3` reach a lowercase
// `minimax-m3` slug must NOT let a case-mismatched query resolve to one of
// LiteLLM's [0,0] price stubs (e.g. `GigaChat-2-Max`). Doing so would flip an
// honest null (which fires the "no pricing data, will show $0" warning) into a
// silent $0 and hide real spend. A case-EXACT query still finds the stub.
describe('zero-priced stubs do not satisfy case-insensitive lookup', () => {
  it('a case-mismatched query to a [0,0] stub stays null', () => {
    expect(getModelCosts('gigachat-2-max')).toBeNull()
  })

  it('the case-exact stub still resolves (just at zero cost)', () => {
    const exact = getModelCosts('GigaChat-2-Max')
    expect(exact).not.toBeNull()
    expect(exact!.inputCostPerToken).toBe(0)
  })
})

describe('DeepSeek v4 models resolve to pricing', () => {
  it('deepseek-v4-pro has current official discounted pricing', () => {
    const costs = getModelCosts('deepseek-v4-pro')
    expect(costs).not.toBeNull()
    expect(costs!.inputCostPerToken).toBe(4.35e-7)
    expect(costs!.outputCostPerToken).toBe(8.7e-7)
    expect(costs!.cacheReadCostPerToken).toBe(3.625e-9)
    expect(costs!.cacheWriteCostPerToken).toBe(0)
  })

  it('deepseek-v4-flash has current official pricing', () => {
    const costs = getModelCosts('deepseek-v4-flash')
    expect(costs).not.toBeNull()
    expect(costs!.inputCostPerToken).toBe(1.4e-7)
    expect(costs!.outputCostPerToken).toBe(2.8e-7)
    expect(costs!.cacheReadCostPerToken).toBe(2.8e-9)
    expect(costs!.cacheWriteCostPerToken).toBe(0)
  })

  it('provider-prefixed DeepSeek v4 names resolve to the same pricing', () => {
    expect(getModelCosts('deepseek/deepseek-v4-pro')).toEqual(getModelCosts('deepseek-v4-pro'))
    expect(getModelCosts('deepseek/deepseek-v4-flash')).toEqual(getModelCosts('deepseek-v4-flash'))
  })

  it('calculates non-zero costs for observed DeepSeek v4 Claude usage', () => {
    const pro = calculateCost('deepseek-v4-pro', 2_477_914, 762_994, 0, 258_556_928, 0)
    const flash = calculateCost('deepseek-v4-flash', 1_552_573, 353_914, 0, 48_388_608, 0)

    expect(pro).toBeCloseTo(2.68, 2)
    expect(flash).toBeCloseTo(0.45, 2)
  })

  it('uses DeepSeek v4 display names', () => {
    expect(getShortModelName('deepseek-v4-pro')).toBe('DeepSeek v4 Pro')
    expect(getShortModelName('deepseek-v4-flash')).toBe('DeepSeek v4 Flash')
  })

  it('keeps bundled DeepSeek v4 fallback entries when runtime pricing cache is stale', async () => {
    const cacheRoot = await mkdtemp(join(tmpdir(), 'codeburn-pricing-cache-'))

    try {
      process.env['CODEBURN_CACHE_DIR'] = cacheRoot
      await mkdir(cacheRoot, { recursive: true })
      await writeFile(join(cacheRoot, 'litellm-pricing.json'), JSON.stringify({
        timestamp: Date.now(),
        data: {
          'gpt-4o-mini': {
            inputCostPerToken: 9e-7,
            outputCostPerToken: 1.8e-6,
            cacheWriteCostPerToken: 0,
            cacheReadCostPerToken: 9e-8,
            webSearchCostPerRequest: 0.01,
            fastMultiplier: 1,
          },
        },
      }), 'utf-8')

      await loadPricing()

      expect(getModelCosts('gpt-4o-mini')!.inputCostPerToken).toBe(9e-7)
      expect(getModelCosts('deepseek-v4-pro')!.inputCostPerToken).toBe(4.35e-7)
      expect(getModelCosts('deepseek-v4-flash')!.inputCostPerToken).toBe(1.4e-7)
    } finally {
      await rm(cacheRoot, { recursive: true, force: true })
      await loadPricing()
    }
  })
})