import { describe, it, expect } from 'vitest'
import { generateCsvContent } from '@/lib/export/csv-export'
import type { Process, Simulation, Resource, SimulationResult } from '@/domain/types'

// ─── Fixtures ─────────────────────────────────────────────────────────────────

function makeProcess(currency: string, extras: Partial<Process> = {}): Process {
  return {
    id: 'p1', name: 'Proceso de Ventas', clientName: 'Empresa ABC',
    bpmnXml: '', currency, overheadPercentage: 0.2,
    annualFrequency: 1000, analysisHorizonYears: 3, automationInvestment: 0,
    createdAt: 0, updatedAt: 0, groupId: null, tags: [], ownerId: 'test-user', ...extras,
  }
}

function makeSimulation(perActivity: SimulationResult['perActivity'] = []): Simulation {
  const totalDirect = perActivity.reduce((s, a) => s + a.expectedDirectCost, 0)
  const totalIndirect = perActivity.reduce((s, a) => s + a.expectedIndirectCost, 0)
  return {
    id: 'sim1', processId: 'p1',
    executedAt: new Date('2026-05-13T10:00:00Z').getTime(),
    result: {
      totalCost: totalDirect + totalIndirect,
      totalDirectCost: totalDirect,
      totalIndirectCost: totalIndirect,
      totalTimeMinutes: 90,
      perActivity,
      perResource: [],
      warnings: [],
    },
  }
}

const mockActivities: SimulationResult['perActivity'] = [
  {
    activityId: 'a1', bpmnElementId: 'task1', activityName: 'Recibir solicitud',
    expectedDirectCost: 500, expectedIndirectCost: 100, expectedTotalCost: 600,
    percentOfTotal: 60, executionProbability: 1.0, expectedExecutions: 1.0,
    executionTimeMinutes: 30, resourceCostBreakdown: [],
  },
  {
    activityId: 'a2', bpmnElementId: 'task2', activityName: 'Análisis de crédito',
    expectedDirectCost: 250, expectedIndirectCost: 50, expectedTotalCost: 300,
    percentOfTotal: 30, executionProbability: 0.8, expectedExecutions: 0.8,
    executionTimeMinutes: 60, resourceCostBreakdown: [],
  },
  {
    activityId: 'a3', bpmnElementId: 'task3', activityName: 'Notificación al cliente',
    expectedDirectCost: 83.33, expectedIndirectCost: 16.67, expectedTotalCost: 100,
    percentOfTotal: 10, executionProbability: 0.5, expectedExecutions: 0.5,
    executionTimeMinutes: 15, resourceCostBreakdown: [],
  },
]

const resources: Resource[] = []

// ─── BOM UTF-8 ────────────────────────────────────────────────────────────────
describe('CSV — BOM UTF-8', () => {
  it('comienza con BOM UTF-8 (\\uFEFF)', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    expect(csv.charCodeAt(0)).toBe(0xFEFF)
  })

  it('BOM está presente para PYG también', () => {
    const csv = generateCsvContent({ process: makeProcess('PYG'), simulation: makeSimulation(mockActivities), resources })
    expect(csv.charCodeAt(0)).toBe(0xFEFF)
  })
})

// ─── Separadores ──────────────────────────────────────────────────────────────
describe('CSV — separadores', () => {
  it('USD: separador de columnas es coma ","', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    // Los headers deben estar separados por coma
    const headerLine = csv.split('\r\n').find((l) => l.includes('Actividad'))!
    expect(headerLine).toContain(',')
    expect(headerLine).not.toContain(';')
  })

  it('PYG: separador de columnas es punto y coma ";"', () => {
    const csv = generateCsvContent({ process: makeProcess('PYG'), simulation: makeSimulation(mockActivities), resources })
    const headerLine = csv.split('\r\n').find((l) => l.includes('Actividad'))!
    expect(headerLine).toContain(';')
    expect(headerLine).not.toContain(',"Actividad"')
  })

  it('BRL: separador es punto y coma', () => {
    const csv = generateCsvContent({ process: makeProcess('BRL'), simulation: makeSimulation(mockActivities), resources })
    const headerLine = csv.split('\r\n').find((l) => l.includes('Actividad'))!
    expect(headerLine).toContain(';')
  })

  it('EUR: separador es punto y coma', () => {
    const csv = generateCsvContent({ process: makeProcess('EUR'), simulation: makeSimulation(mockActivities), resources })
    const headerLine = csv.split('\r\n').find((l) => l.includes('Actividad'))!
    expect(headerLine).toContain(';')
  })
})

// ─── Separadores decimales ─────────────────────────────────────────────────────
describe('CSV — separadores decimales', () => {
  it('USD: decimal es punto "." → "500.00"', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('500.00')
  })

  it('PYG: decimal es coma "," → "500,00"', () => {
    const csv = generateCsvContent({ process: makeProcess('PYG'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('500,00')
  })

  it('BRL: decimal es coma', () => {
    const csv = generateCsvContent({ process: makeProcess('BRL'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('500,00')
  })
})

// ─── Headers ──────────────────────────────────────────────────────────────────
describe('CSV — headers', () => {
  it('contiene "Actividad" en los headers', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('Actividad')
  })

  it('header de costo incluye la moneda: "Costo total (USD)"', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('Costo total (USD)')
  })

  it('header de costo incluye la moneda: "Costo total (PYG)"', () => {
    const csv = generateCsvContent({ process: makeProcess('PYG'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('Costo total (PYG)')
  })

  it('contiene todos los headers requeridos', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('ID BPMN')
    expect(csv).toContain('Tiempo (min)')
    expect(csv).toContain('% del total')
    expect(csv).toContain('Ejecuciones esperadas')
    expect(csv).toContain('Recursos asignados')
  })
})

// ─── Cantidad de filas ────────────────────────────────────────────────────────
describe('CSV — cantidad de filas', () => {
  it('tiene exactamente N filas de datos + header + metadata', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    // Quitar BOM antes de procesar para no confundir el filtro de comentarios
    const csvNoBom = csv.startsWith('') ? csv.slice(1) : csv
    const lines = csvNoBom.split('\r\n').filter((l) => l.trim() && !l.startsWith('#'))
    // 1 header + N actividades
    expect(lines).toHaveLength(mockActivities.length + 1)
  })

  it('0 actividades → solo header', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation([]), resources })
    const csvNoBom = csv.startsWith('') ? csv.slice(1) : csv
    const lines = csvNoBom.split('\r\n').filter((l) => l.trim() && !l.startsWith('#'))
    expect(lines).toHaveLength(1) // solo el header
  })
})

// ─── Metadata de cabecera ─────────────────────────────────────────────────────
describe('CSV — metadata', () => {
  it('la metadata comienza con "# Proceso:"', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('# Proceso: Proceso de Ventas')
  })

  it('la metadata contiene el nombre del cliente', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('# Cliente: Empresa ABC')
  })

  it('la metadata contiene el costo total', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources })
    expect(csv).toContain('# Costo total (USD)')
  })
})

// ─── Caracteres especiales / UTF-8 ───────────────────────────────────────────
describe('CSV — UTF-8 y caracteres especiales', () => {
  it('nombres con acentos se preservan correctamente', () => {
    const activitiesWithAccents: SimulationResult['perActivity'] = [{
      activityId: 'a1', bpmnElementId: 't1',
      activityName: 'Revisión y Análisis Crítico',
      expectedDirectCost: 100, expectedIndirectCost: 20, expectedTotalCost: 120,
      percentOfTotal: 100, executionProbability: 1, expectedExecutions: 1,
      executionTimeMinutes: 30, resourceCostBreakdown: [],
    }]
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(activitiesWithAccents), resources })
    expect(csv).toContain('Revisión y Análisis Crítico')
  })

  it('nombre del proceso con ñ se preserva', () => {
    const process = makeProcess('USD', { name: 'Gestión de la Compañía' })
    const csv = generateCsvContent({ process, simulation: makeSimulation([]), resources })
    expect(csv).toContain('Gestión de la Compañía')
  })

  it('actividad con nombre en blanco no rompe el CSV', () => {
    const activitiesBlank: SimulationResult['perActivity'] = [{
      activityId: 'a1', bpmnElementId: 't1', activityName: '',
      expectedDirectCost: 0, expectedIndirectCost: 0, expectedTotalCost: 0,
      percentOfTotal: 0, executionProbability: 1, expectedExecutions: 1,
      executionTimeMinutes: 0, resourceCostBreakdown: [],
    }]
    expect(() => generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(activitiesBlank), resources })).not.toThrow()
  })
})

// ─── Recursos vacíos ──────────────────────────────────────────────────────────
describe('CSV — recursos vacíos', () => {
  it('actividad sin recursos → celda de recursos vacía (no rompe)', () => {
    const csv = generateCsvContent({ process: makeProcess('USD'), simulation: makeSimulation(mockActivities), resources: [] })
    // No debe crashear y el contenido es válido
    expect(csv.length).toBeGreaterThan(0)
    expect(csv).toContain('Recibir solicitud')
  })
})