import { describe, it, expect } from 'vitest'
import {
  runRuleset,
  getDocType,
  applyBlockRemoval,
  type RuleInput,
} from './ruleEngine'
import { EMPTY_CONTEXT } from './contextBridge'
import type { TemplateContext } from './contextBridge'

// =============================================================================
// Helpers
// =============================================================================

function makeInput(overrides: Partial<RuleInput> = {}): RuleInput {
  return {
    doc_type: 'nda_de',
    render: { lang: 'de', variant: 'standard' },
    context: JSON.parse(JSON.stringify(EMPTY_CONTEXT)) as TemplateContext,
    modules: { enabled: [] },
    ...overrides,
  }
}

function withCtx(partial: Partial<TemplateContext>): TemplateContext {
  return {
    ...JSON.parse(JSON.stringify(EMPTY_CONTEXT)),
    ...partial,
  }
}

// =============================================================================
// getDocType
// =============================================================================

describe('getDocType', () => {
  it('nda+de → nda_de', () => expect(getDocType('nda', 'de')).toBe('nda_de'))
  it('nda+en → nda_en', () => expect(getDocType('nda', 'en')).toBe('nda_en'))
  it('sla+de → sla_de', () => expect(getDocType('sla', 'de')).toBe('sla_de'))
  it('acceptable_use+en → acceptable_use_en', () =>
    expect(getDocType('acceptable_use', 'en')).toBe('acceptable_use_en'))
  it('cloud_service_agreement+de → cloud_contract_de', () =>
    expect(getDocType('cloud_service_agreement', 'de')).toBe('cloud_contract_de'))
  it('agb+de → agb_de', () => expect(getDocType('agb', 'de')).toBe('agb_de'))
  it('unknown type → fallback composite', () =>
    expect(getDocType('some_custom', 'fr')).toBe('some_custom_fr'))
})

// =============================================================================
// compute_flags
// =============================================================================

describe('compute_flags', () => {
  it('IS_B2C=true when CUSTOMER.IS_CONSUMER=true', () => {
    const ctx = withCtx({
      CUSTOMER: { ...EMPTY_CONTEXT.CUSTOMER, IS_CONSUMER: true, IS_BUSINESS: false },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.computedFlags.IS_B2C).toBe(true)
    expect(r.computedFlags.IS_B2B).toBe(false)
  })

  it('IS_B2B=true when CUSTOMER.IS_BUSINESS=true', () => {
    const ctx = withCtx({
      CUSTOMER: { ...EMPTY_CONTEXT.CUSTOMER, IS_CONSUMER: false, IS_BUSINESS: true },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.computedFlags.IS_B2B).toBe(true)
    expect(r.computedFlags.IS_B2C).toBe(false)
  })

  it('SERVICE_IS_SAAS=true when SERVICE.MODEL=SaaS', () => {
    const ctx = withCtx({ SERVICE: { ...EMPTY_CONTEXT.SERVICE, MODEL: 'SaaS' } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.computedFlags.SERVICE_IS_SAAS).toBe(true)
    expect(r.computedFlags.SERVICE_IS_HYBRID).toBe(false)
  })

  it('HAS_PENALTY=true when NDA.PENALTY_AMOUNT_EUR is set', () => {
    const ctx = withCtx({ NDA: { ...EMPTY_CONTEXT.NDA, PENALTY_AMOUNT_EUR: 5000 } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.computedFlags.HAS_PENALTY).toBe(true)
  })

  it('HAS_PENALTY=false when NDA.PENALTY_AMOUNT_EUR is null', () => {
    const ctx = withCtx({ NDA: { ...EMPTY_CONTEXT.NDA, PENALTY_AMOUNT_EUR: null } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.computedFlags.HAS_PENALTY).toBe(false)
  })

  it('HAS_ANALYTICS=true when CONSENT.ANALYTICS_TOOLS is set', () => {
    const ctx = withCtx({ CONSENT: { ...EMPTY_CONTEXT.CONSENT, ANALYTICS_TOOLS: 'GA4' } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.computedFlags.HAS_ANALYTICS).toBe(true)
  })

  it('HAS_ANALYTICS=false when CONSENT.ANALYTICS_TOOLS is null', () => {
    const ctx = withCtx({ CONSENT: { ...EMPTY_CONTEXT.CONSENT, ANALYTICS_TOOLS: null } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.computedFlags.HAS_ANALYTICS).toBe(false)
  })
})

// =============================================================================
// auto_defaults
// =============================================================================

describe('auto_defaults', () => {
  it('sets LOG_RETENTION_DAYS=7 when value is 0', () => {
    const ctx = withCtx({
      SECURITY: { ...EMPTY_CONTEXT.SECURITY, LOG_RETENTION_DAYS: 0 },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.contextAfterDefaults.SECURITY.LOG_RETENTION_DAYS).toBe(7)
    expect(r.appliedDefaults).toContain('DEFAULT_LOG_RETENTION')
  })

  it('sets SECURITY_LOG_RETENTION_DAYS=30 when value is 0', () => {
    const ctx = withCtx({
      SECURITY: { ...EMPTY_CONTEXT.SECURITY, SECURITY_LOG_RETENTION_DAYS: 0 },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.contextAfterDefaults.SECURITY.SECURITY_LOG_RETENTION_DAYS).toBe(30)
    expect(r.appliedDefaults).toContain('DEFAULT_SECURITY_LOG_RETENTION')
  })

  it('does not apply default when LOG_RETENTION_DAYS is non-zero', () => {
    const ctx = withCtx({
      SECURITY: { ...EMPTY_CONTEXT.SECURITY, LOG_RETENTION_DAYS: 14 },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.contextAfterDefaults.SECURITY.LOG_RETENTION_DAYS).toBe(14)
    expect(r.appliedDefaults).not.toContain('DEFAULT_LOG_RETENTION')
  })

  it('does not mutate original context object', () => {
    const ctx = withCtx({
      SECURITY: { ...EMPTY_CONTEXT.SECURITY, LOG_RETENTION_DAYS: 0 },
    })
    const originalValue = ctx.SECURITY.LOG_RETENTION_DAYS
    runRuleset(makeInput({ context: ctx }))
    expect(ctx.SECURITY.LOG_RETENTION_DAYS).toBe(originalValue)
  })
})

// =============================================================================
// hard_validations
// =============================================================================

describe('hard_validations', () => {
  it('DOC_LANG_MATCH_DE: error when lang=en for nda_de', () => {
    const r = runRuleset(makeInput({
      doc_type: 'nda_de',
      render: { lang: 'en', variant: 'standard' },
    }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).toContain('DOC_LANG_MATCH_DE')
  })

  it('DOC_LANG_MATCH_DE: no error when lang=de for nda_de', () => {
    const r = runRuleset(makeInput({
      doc_type: 'nda_de',
      render: { lang: 'de', variant: 'standard' },
    }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).not.toContain('DOC_LANG_MATCH_DE')
  })

  it('DOC_LANG_MATCH_EN: error when lang=de for nda_en', () => {
    const r = runRuleset(makeInput({
      doc_type: 'nda_en',
      render: { lang: 'de', variant: 'standard' },
    }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).toContain('DOC_LANG_MATCH_EN')
  })

  it('CUSTOMER_ROLE_XOR: error when both IS_CONSUMER and IS_BUSINESS are true', () => {
    const ctx = withCtx({
      CUSTOMER: { ...EMPTY_CONTEXT.CUSTOMER, IS_CONSUMER: true, IS_BUSINESS: true },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).toContain('CUSTOMER_ROLE_XOR')
  })

  it('CUSTOMER_ROLE_XOR: no error when only IS_BUSINESS=true', () => {
    const ctx = withCtx({
      CUSTOMER: { ...EMPTY_CONTEXT.CUSTOMER, IS_CONSUMER: false, IS_BUSINESS: true },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).not.toContain('CUSTOMER_ROLE_XOR')
  })

  it('PROVIDER_IDENTITY: error when LEGAL_NAME is empty', () => {
    const ctx = withCtx({
      PROVIDER: { ...EMPTY_CONTEXT.PROVIDER, LEGAL_NAME: '', EMAIL: 'test@example.com' },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).toContain('PROVIDER_IDENTITY')
  })

  it('PROVIDER_IDENTITY: no error when LEGAL_NAME and EMAIL are set', () => {
    const ctx = withCtx({
      PROVIDER: { ...EMPTY_CONTEXT.PROVIDER, LEGAL_NAME: 'ACME GmbH', EMAIL: 'info@acme.de' },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).not.toContain('PROVIDER_IDENTITY')
  })

  it('SLA_AVAILABILITY_RANGE: error for sla_de with 85% availability', () => {
    const ctx = withCtx({ SLA: { ...EMPTY_CONTEXT.SLA, AVAILABILITY_PERCENT: 85 } })
    const r = runRuleset(makeInput({
      doc_type: 'sla_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
    }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).toContain('SLA_AVAILABILITY_RANGE')
  })

  it('SLA_AVAILABILITY_RANGE: no error for sla_de with 99.5%', () => {
    const ctx = withCtx({ SLA: { ...EMPTY_CONTEXT.SLA, AVAILABILITY_PERCENT: 99.5 } })
    const r = runRuleset(makeInput({
      doc_type: 'sla_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
    }))
    const ids = r.violations.map((v) => v.id)
    expect(ids).not.toContain('SLA_AVAILABILITY_RANGE')
  })
})

// =============================================================================
// auto_remove_blocks
// =============================================================================

describe('auto_remove_blocks', () => {
  it('removes NDA_PENALTY_BLOCK when PENALTY_AMOUNT_EUR is null', () => {
    const ctx = withCtx({ NDA: { ...EMPTY_CONTEXT.NDA, PENALTY_AMOUNT_EUR: null } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.removedBlocks).toContain('NDA_PENALTY_BLOCK')
  })

  it('keeps NDA_PENALTY_BLOCK when PENALTY_AMOUNT_EUR is set', () => {
    const ctx = withCtx({ NDA: { ...EMPTY_CONTEXT.NDA, PENALTY_AMOUNT_EUR: 5000 } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.removedBlocks).not.toContain('NDA_PENALTY_BLOCK')
  })

  it('removes COOKIE_ANALYTICS_BLOCK when HAS_ANALYTICS=false', () => {
    const ctx = withCtx({ CONSENT: { ...EMPTY_CONTEXT.CONSENT, ANALYTICS_TOOLS: null } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.removedBlocks).toContain('COOKIE_ANALYTICS_BLOCK')
  })

  it('keeps COOKIE_ANALYTICS_BLOCK when ANALYTICS_TOOLS is set', () => {
    const ctx = withCtx({ CONSENT: { ...EMPTY_CONTEXT.CONSENT, ANALYTICS_TOOLS: 'GA4' } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.removedBlocks).not.toContain('COOKIE_ANALYTICS_BLOCK')
  })

  it('removes COOKIE_MARKETING_BLOCK when HAS_MARKETING=false', () => {
    const ctx = withCtx({ CONSENT: { ...EMPTY_CONTEXT.CONSENT, MARKETING_PARTNERS: null } })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.removedBlocks).toContain('COOKIE_MARKETING_BLOCK')
  })

  it('keeps COOKIE_MARKETING_BLOCK when MARKETING_PARTNERS is set', () => {
    const ctx = withCtx({
      CONSENT: { ...EMPTY_CONTEXT.CONSENT, MARKETING_PARTNERS: 'Facebook Ads' },
    })
    const r = runRuleset(makeInput({ context: ctx }))
    expect(r.removedBlocks).not.toContain('COOKIE_MARKETING_BLOCK')
  })
})

// =============================================================================
// module_requirements
// =============================================================================

describe('module_requirements', () => {
  it('REQ_CLOUD_EXPORT_MODULE: ERROR for cloud_contract_de + SaaS without module', () => {
    const ctx = withCtx({ SERVICE: { ...EMPTY_CONTEXT.SERVICE, MODEL: 'SaaS' } })
    const r = runRuleset(makeInput({
      doc_type: 'cloud_contract_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
      modules: { enabled: [] },
    }))
    expect(r.violations.some((v) => v.id === 'REQ_CLOUD_EXPORT_MODULE')).toBe(true)
  })

  it('REQ_CLOUD_EXPORT_MODULE: no error when module is enabled', () => {
    const ctx = withCtx({ SERVICE: { ...EMPTY_CONTEXT.SERVICE, MODEL: 'SaaS' } })
    const r = runRuleset(makeInput({
      doc_type: 'cloud_contract_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
      modules: { enabled: ['CLOUD_EXPORT_DELETE_DE'] },
    }))
    expect(r.violations.some((v) => v.id === 'REQ_CLOUD_EXPORT_MODULE')).toBe(false)
  })

  it('REQ_B2C_WITHDRAWAL_MODULE: WARN for agb_de + B2C + SaaS without module', () => {
    const ctx = withCtx({
      CUSTOMER: { ...EMPTY_CONTEXT.CUSTOMER, IS_CONSUMER: true, IS_BUSINESS: false },
      SERVICE: { ...EMPTY_CONTEXT.SERVICE, MODEL: 'SaaS' },
    })
    const r = runRuleset(makeInput({
      doc_type: 'agb_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
      modules: { enabled: [] },
    }))
    expect(r.warnings.some((w) => w.id === 'REQ_B2C_WITHDRAWAL_MODULE')).toBe(true)
  })

  it('REQ_B2C_WITHDRAWAL_MODULE: no warn when module is enabled', () => {
    const ctx = withCtx({
      CUSTOMER: { ...EMPTY_CONTEXT.CUSTOMER, IS_CONSUMER: true, IS_BUSINESS: false },
      SERVICE: { ...EMPTY_CONTEXT.SERVICE, MODEL: 'SaaS' },
    })
    const r = runRuleset(makeInput({
      doc_type: 'agb_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
      modules: { enabled: ['B2C_WITHDRAWAL_DE'] },
    }))
    expect(r.warnings.some((w) => w.id === 'REQ_B2C_WITHDRAWAL_MODULE')).toBe(false)
  })
})

// =============================================================================
// warnings
// =============================================================================

describe('warnings', () => {
  it('WARN_LEGAL_REVIEW: always present', () => {
    const r = runRuleset(makeInput())
    expect(r.warnings.some((w) => w.id === 'WARN_LEGAL_REVIEW')).toBe(true)
  })

  it('WARN_EXPORT_FORMATS_MISSING: fires for cloud_contract_de + SaaS with EXPORT_WINDOW_DAYS=0', () => {
    const ctx = withCtx({
      SERVICE: { ...EMPTY_CONTEXT.SERVICE, MODEL: 'SaaS', EXPORT_WINDOW_DAYS: 0 },
    })
    const r = runRuleset(makeInput({
      doc_type: 'cloud_contract_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
    }))
    expect(r.warnings.some((w) => w.id === 'WARN_EXPORT_FORMATS_MISSING')).toBe(true)
  })

  it('WARN_EXPORT_FORMATS_MISSING: does not fire for non-SaaS cloud doc', () => {
    const ctx = withCtx({
      SERVICE: { ...EMPTY_CONTEXT.SERVICE, MODEL: 'OnPrem', EXPORT_WINDOW_DAYS: 0 },
    })
    const r = runRuleset(makeInput({
      doc_type: 'cloud_contract_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
    }))
    expect(r.warnings.some((w) => w.id === 'WARN_EXPORT_FORMATS_MISSING')).toBe(false)
  })

  it('WARN_EXPORT_FORMATS_MISSING: does not fire when EXPORT_WINDOW_DAYS >= 1', () => {
    const ctx = withCtx({
      SERVICE: { ...EMPTY_CONTEXT.SERVICE, MODEL: 'SaaS', EXPORT_WINDOW_DAYS: 30 },
    })
    const r = runRuleset(makeInput({
      doc_type: 'cloud_contract_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
    }))
    expect(r.warnings.some((w) => w.id === 'WARN_EXPORT_FORMATS_MISSING')).toBe(false)
  })
})

// =============================================================================
// applyBlockRemoval
// =============================================================================

describe('applyBlockRemoval', () => {
  const NDA_WITH_PENALTY = `# NDA

## §1 Zweck

Inhalt.

[BLOCK:NDA_PENALTY_BLOCK]
## §7 Vertragsstrafe

Der Verletzer zahlt {{PENALTY_AMOUNT}} EUR.

[/BLOCK:NDA_PENALTY_BLOCK]

## §8 Schlussbestimmungen
`

  it('removes the block when its ID is in removedBlocks', () => {
    const result = applyBlockRemoval(NDA_WITH_PENALTY, ['NDA_PENALTY_BLOCK'])
    expect(result).not.toContain('[BLOCK:NDA_PENALTY_BLOCK]')
    expect(result).not.toContain('Vertragsstrafe')
    expect(result).toContain('§8 Schlussbestimmungen')
  })

  it('keeps the block when its ID is NOT in removedBlocks', () => {
    const result = applyBlockRemoval(NDA_WITH_PENALTY, [])
    expect(result).toContain('[BLOCK:NDA_PENALTY_BLOCK]')
    expect(result).toContain('Vertragsstrafe')
  })

  it('removes multiple blocks independently', () => {
    const content = `Header\n[BLOCK:A]\nBlock A\n[/BLOCK:A]\nMiddle\n[BLOCK:B]\nBlock B\n[/BLOCK:B]\nFooter`
    const result = applyBlockRemoval(content, ['A', 'B'])
    expect(result).toContain('Header')
    expect(result).toContain('Middle')
    expect(result).toContain('Footer')
    expect(result).not.toContain('Block A')
    expect(result).not.toContain('Block B')
  })

  it('handles multiline content within a block', () => {
    const content = `[BLOCK:X]\nLine 1\nLine 2\nLine 3\n[/BLOCK:X]\nAfter`
    const result = applyBlockRemoval(content, ['X'])
    expect(result).not.toContain('Line 1')
    expect(result).toContain('After')
  })

  it('is a no-op when content has no block markers', () => {
    const plain = '# Simple document\n\nJust text.'
    expect(applyBlockRemoval(plain, ['NDA_PENALTY_BLOCK'])).toBe(plain)
  })
})

// =============================================================================
// Integration: valid NDA with penalty
// =============================================================================

describe('integration', () => {
  it('valid NDA DE with penalty: 0 errors, correct flags', () => {
    const ctx = withCtx({
      PROVIDER: { ...EMPTY_CONTEXT.PROVIDER, LEGAL_NAME: 'ACME GmbH', EMAIL: 'info@acme.de' },
      CUSTOMER: { ...EMPTY_CONTEXT.CUSTOMER, IS_CONSUMER: false, IS_BUSINESS: true },
      NDA: { PURPOSE: 'Software-Entwicklung', DURATION_YEARS: 5, PENALTY_AMOUNT_EUR: 10000 },
    })
    const r = runRuleset(makeInput({
      doc_type: 'nda_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
    }))

    expect(r.violations).toHaveLength(0)
    expect(r.computedFlags.HAS_PENALTY).toBe(true)
    expect(r.computedFlags.IS_B2B).toBe(true)
    expect(r.removedBlocks).not.toContain('NDA_PENALTY_BLOCK')
    // WARN_LEGAL_REVIEW always present
    expect(r.warnings.some((w) => w.id === 'WARN_LEGAL_REVIEW')).toBe(true)
  })

  it('valid NDA DE without penalty: penalty block removed', () => {
    const ctx = withCtx({
      PROVIDER: { ...EMPTY_CONTEXT.PROVIDER, LEGAL_NAME: 'ACME GmbH', EMAIL: 'info@acme.de' },
      CUSTOMER: { ...EMPTY_CONTEXT.CUSTOMER, IS_CONSUMER: false, IS_BUSINESS: true },
      NDA: { PURPOSE: 'Vertrieb', DURATION_YEARS: 3, PENALTY_AMOUNT_EUR: null },
    })
    const r = runRuleset(makeInput({
      doc_type: 'nda_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
    }))

    expect(r.violations).toHaveLength(0)
    expect(r.computedFlags.HAS_PENALTY).toBe(false)
    expect(r.removedBlocks).toContain('NDA_PENALTY_BLOCK')
  })

  it('cookie banner DE with analytics: keeps analytics block', () => {
    const ctx = withCtx({
      PROVIDER: { ...EMPTY_CONTEXT.PROVIDER, LEGAL_NAME: 'Shop GmbH', EMAIL: 'info@shop.de' },
      CONSENT: { WEBSITE_NAME: 'MyShop', ANALYTICS_TOOLS: 'GA4', MARKETING_PARTNERS: null },
    })
    const r = runRuleset(makeInput({
      doc_type: 'cookie_banner_de',
      render: { lang: 'de', variant: 'standard' },
      context: ctx,
    }))

    expect(r.removedBlocks).not.toContain('COOKIE_ANALYTICS_BLOCK')
    expect(r.removedBlocks).toContain('COOKIE_MARKETING_BLOCK')
    expect(r.computedFlags.HAS_ANALYTICS).toBe(true)
    expect(r.computedFlags.HAS_MARKETING).toBe(false)
  })
})