import { MULTIVALUE_DELIMITER } from '@/constants/app.constant'
import { getNodeHeight, nodeSize } from './workflowConstants'
import type {
  CompareOutcomeDto,
  SaveCriteriaInput,
  WorkflowConditionDto,
  WorkflowCriteriaDto,
} from '@/services/workflow.service'

export type WorkflowCriteriaForm = Partial<WorkflowCriteriaDto> & {
  id?: string | null
  listFormCode: string
  compareOutcomes: CompareOutcomeDto[]
}

export type WorkflowOutcome = {
  field: string
  label: string
  targetId?: string | null
}

export type WorkflowLinkPort = {
  field?: string
  index?: number
  count?: number
  sourceSlotIndex?: number
  sourceSlotCount?: number
  targetSlotIndex?: number
  targetSlotCount?: number
  routeIndex?: number
  routeCount?: number
}

export type WorkflowLink = {
  key: string
  source: WorkflowCriteriaDto
  target: WorkflowCriteriaDto
  label: string
  sourcePort: WorkflowLinkPort
}

type Endpoint = {
  link: WorkflowLink
  role: 'source' | 'target'
}

export function buildFitLayout(criteria: WorkflowCriteriaDto[]) {
  const links = collectLinks(criteria)
  const rankById = buildTraversalRanks(criteria, links)
  const groups = new Map<number, WorkflowCriteriaDto[]>()
  criteria.forEach((item) => {
    const column = fitColumn(item)
    if (!groups.has(column)) groups.set(column, [])
    groups.get(column)?.push(item)
  })

  const sortedColumns = [...groups.keys()].sort((a, b) => a - b)
  const yGap = 74
  const maxGroupHeight = Math.max(
    1,
    ...[...groups.values()].map(
      (items) =>
        items.reduce((sum, item) => sum + getNodeHeight(item), 0) +
        Math.max(0, items.length - 1) * yGap,
    ),
  )
  const top = 72
  const left = 72
  const xGap = 128
  const positions = new Map<string, { x: number; y: number }>()

  sortedColumns.forEach((column, columnIndex) => {
    const items = (groups.get(column) || []).sort((a, b) => compareLayoutNodes(a, b, rankById))
    const groupHeight =
      items.reduce((sum, item) => sum + getNodeHeight(item), 0) +
      Math.max(0, items.length - 1) * yGap
    let y = top + Math.max(0, (maxGroupHeight - groupHeight) / 2)

    items.forEach((item) => {
      positions.set(item.id, {
        x: left + columnIndex * (nodeSize.width + xGap),
        y: Math.round(y),
      })
      y += getNodeHeight(item) + yGap
    })
  })

  return positions
}

function fitColumn(item: WorkflowCriteriaDto) {
  const priority: Record<string, number> = {
    Start: 0,
    Compare: 1,
    Approval: 2,
    Inform: 3,
    End: 4,
  }

  return priority[item.kind] ?? 2
}

function compareLayoutNodes(
  a: WorkflowCriteriaDto,
  b: WorkflowCriteriaDto,
  rankById = new Map<string, number>(),
) {
  return (
    (rankById.get(a.id) ?? 999) - (rankById.get(b.id) ?? 999) ||
    a.title.localeCompare(b.title, 'tr')
  )
}

function buildTraversalRanks(criteria: WorkflowCriteriaDto[], links: WorkflowLink[]) {
  const rankById = new Map<string, number>()
  const outgoing = new Map<string, string[]>(criteria.map((item) => [item.id, []]))
  links.forEach((link) => {
    outgoing.get(link.source.id)?.push(link.target.id)
  })

  const roots = criteria.filter((item) => item.kind === 'Start')
  const queue = roots.length ? roots.map((item) => item.id) : criteria.map((item) => item.id)

  while (queue.length) {
    const id = queue.shift()
    if (!id) continue
    if (rankById.has(id)) continue

    rankById.set(id, rankById.size)
    ;(outgoing.get(id) || []).forEach((targetId) => {
      if (targetId && !rankById.has(targetId)) queue.push(targetId)
    })
  }

  criteria.forEach((item) => {
    if (!rankById.has(item.id)) rankById.set(item.id, rankById.size)
  })

  return rankById
}

export function collectLinks(criteria: WorkflowCriteriaDto[]) {
  const links: WorkflowLink[] = []
  criteria.forEach((source) => {
    if (source.kind === 'Compare' && source.compareOutcomes?.length) {
      source.compareOutcomes.forEach((outcome, index) => {
        addLink(links, criteria, source, outcome.targetId, outcome.label, `compare-${index}`, {
          index,
          count: source.compareOutcomes.length,
          field: `compareOutcomes:${index}`,
        })
      })
      return
    }

    addLink(links, criteria, source, source.nextOnStart, OUTCOME_KEYS.nextOnStart, 'next', {
      index: 0,
      count: 1,
      field: 'nextOnStart',
    })
    addLink(links, criteria, source, source.nextOnTrue, OUTCOME_KEYS.nextOnTrue, 'true', {
      index: 0,
      count: 2,
      field: 'nextOnTrue',
    })
    addLink(links, criteria, source, source.nextOnFalse, OUTCOME_KEYS.nextOnFalse, 'false', {
      index: 1,
      count: 2,
      field: 'nextOnFalse',
    })
    addLink(links, criteria, source, source.nextOnApprove, OUTCOME_KEYS.nextOnApprove, 'approve', {
      index: 0,
      count: 2,
      field: 'nextOnApprove',
    })
    addLink(links, criteria, source, source.nextOnReject, OUTCOME_KEYS.nextOnReject, 'reject', {
      index: 1,
      count: 2,
      field: 'nextOnReject',
    })
  })
  return assignLinkSlots(links)
}

export function assignLinkSlots(links: WorkflowLink[]) {
  const endpointGroups = new Map<string, Endpoint[]>()
  const addEndpoint = (nodeId: string, side: string, endpoint: Endpoint) => {
    const key = `${nodeId}:${side}`
    if (!endpointGroups.has(key)) endpointGroups.set(key, [])
    endpointGroups.get(key)?.push(endpoint)
  }

  links.forEach((link) => {
    addEndpoint(link.source.id, sideToward(link.source, link.target), {
      link,
      role: 'source',
    })
    addEndpoint(link.target.id, sideToward(link.target, link.source), {
      link,
      role: 'target',
    })
  })

  endpointGroups.forEach((endpoints) => {
    endpoints.forEach((endpoint, index) => {
      if (endpoint.role === 'source') {
        endpoint.link.sourcePort.sourceSlotIndex = index
        endpoint.link.sourcePort.sourceSlotCount = endpoints.length
      } else {
        endpoint.link.sourcePort.targetSlotIndex = index
        endpoint.link.sourcePort.targetSlotCount = endpoints.length
      }
    })
  })

  links.forEach((link) => {
    link.sourcePort.routeIndex = link.sourcePort.targetSlotIndex ?? 0
    link.sourcePort.routeCount = link.sourcePort.targetSlotCount ?? 1
  })

  return links
}

function sideToward(from: WorkflowCriteriaDto, to: WorkflowCriteriaDto) {
  const fromLeft = Number(from.positionX || 0)
  const fromTop = Number(from.positionY || 0)
  const fromCenter = {
    x: fromLeft + nodeSize.width / 2,
    y: fromTop + getNodeHeight(from) / 2,
  }
  const toCenter = {
    x: Number(to.positionX || 0) + nodeSize.width / 2,
    y: Number(to.positionY || 0) + getNodeHeight(to) / 2,
  }

  const dx = toCenter.x - fromCenter.x
  const dy = toCenter.y - fromCenter.y

  const horizontalDistance = Math.abs(dx) / (nodeSize.width / 2)
  const verticalDistance = Math.abs(dy) / (getNodeHeight(from) / 2)
  if (horizontalDistance >= verticalDistance) return dx >= 0 ? 'right' : 'left'
  return dy >= 0 ? 'bottom' : 'top'
}

/** Çıkış etiketleri lokalizasyon anahtarı olarak taşınır; ekranda `translate` ile çözülür. */
export const OUTCOME_KEYS = {
  nextOnStart: 'App.WorkflowOutcome.Next',
  nextOnTrue: 'App.WorkflowOutcome.True',
  nextOnFalse: 'App.WorkflowOutcome.False',
  nextOnApprove: 'App.ListFormWorkflow.Approve',
  nextOnReject: 'App.ListFormWorkflow.Reject',
  compare: 'App.WorkflowOutcome.CompareState',
} as const

export function getNodeOutcomes(item: WorkflowCriteriaDto): WorkflowOutcome[] {
  if (item.kind === 'Compare') {
    const outcomes = item.compareOutcomes?.length
      ? item.compareOutcomes
      : [
          { label: OUTCOME_KEYS.nextOnTrue, targetId: item.nextOnTrue },
          { label: OUTCOME_KEYS.nextOnFalse, targetId: item.nextOnFalse },
        ]

    return outcomes.slice(0, 4).map((outcome, index) => ({
      field: `compareOutcomes:${index}`,
      label: outcome.label || `#${index + 1}`,
      targetId: outcome.targetId,
    }))
  }

  if (item.kind === 'Approval') {
    return [
      { field: 'nextOnApprove', label: OUTCOME_KEYS.nextOnApprove, targetId: item.nextOnApprove },
      { field: 'nextOnReject', label: OUTCOME_KEYS.nextOnReject, targetId: item.nextOnReject },
    ]
  }

  if (item.kind === 'End') return []

  return [{ field: 'nextOnStart', label: OUTCOME_KEYS.nextOnStart, targetId: item.nextOnStart }]
}

export function outcomeLabel(field?: string) {
  if (field?.startsWith('compareOutcomes:')) return OUTCOME_KEYS.compare

  const labels: Record<string, string> = {
    nextOnStart: OUTCOME_KEYS.nextOnStart,
    nextOnTrue: OUTCOME_KEYS.nextOnTrue,
    nextOnFalse: OUTCOME_KEYS.nextOnFalse,
    nextOnApprove: OUTCOME_KEYS.nextOnApprove,
    nextOnReject: OUTCOME_KEYS.nextOnReject,
  }

  return field ? labels[field] : undefined
}

export function addLink(
  links: WorkflowLink[],
  criteria: WorkflowCriteriaDto[],
  source: WorkflowCriteriaDto,
  targetId: string | null | undefined,
  label: string,
  type: string,
  sourcePort: WorkflowLinkPort = {},
) {
  if (!targetId) return
  const target = criteria.find((item) => item.id === targetId)
  if (target) {
    links.push({
      key: `${source.id}-${target.id}-${type}`,
      source,
      target,
      label,
      sourcePort,
    })
  }
}

export function emptyCriteria(kind = 'Compare', listFormCode = ''): WorkflowCriteriaForm {
  return {
    id: '',
    listFormCode,
    kind,
    title: defaultTitle(kind),
    compareColumn: 'Price',
    compareOperator: '>',
    compareValue: 5000,
    approver: '',
    nextOnStart: '',
    nextOnTrue: '',
    nextOnFalse: '',
    nextOnApprove: '',
    nextOnReject: '',
    compareOutcomes:
      kind === 'Compare' ? [emptyCompareOutcome1('>5000'), emptyCompareOutcome2('<=5000')] : [],
    positionX: 32,
    positionY: 150,
  }
}

export function uniqueCriteriaTitle(
  kind: string,
  criteria: Array<Pick<WorkflowCriteriaDto, 'id' | 'kind' | 'title'>>,
  currentId?: string | null,
  preferredTitle?: string | null,
) {
  const hasPreferredTitle = Boolean(preferredTitle?.trim())
  const baseTitle = (preferredTitle || defaultTitle(kind)).trim()
  const usedTitles = new Set(
    criteria
      .filter((item) => !currentId || item.id !== currentId)
      .map((item) => (item.title || '').trim().toLocaleLowerCase('tr-TR'))
      .filter(Boolean),
  )

  if (!hasPreferredTitle) {
    const sameKindCount = criteria.filter(
      (item) =>
        (!currentId || item.id !== currentId) &&
        item.kind === kind &&
        isDefaultTitleVariant(item.title, baseTitle),
    ).length
    let index = sameKindCount + 1
    let candidate = `${baseTitle}${index}`
    while (usedTitles.has(candidate.toLocaleLowerCase('tr-TR'))) {
      index += 1
      candidate = `${baseTitle}${index}`
    }

    return candidate
  }

  if (!usedTitles.has(baseTitle.toLocaleLowerCase('tr-TR'))) {
    return baseTitle
  }

  let index = 1
  let candidate = `${baseTitle}${index}`
  while (usedTitles.has(candidate.toLocaleLowerCase('tr-TR'))) {
    index += 1
    candidate = `${baseTitle}${index}`
  }

  return candidate
}

export function uniqueCriteriaId(
  criteria: Array<Pick<WorkflowCriteriaDto, 'id'>>,
  reservedIds: string[] = [],
) {
  const usedIds = new Set(
    [...criteria.map((item) => item.id), ...reservedIds]
      .map((id) => (id || '').trim().toLocaleLowerCase('tr-TR'))
      .filter(Boolean),
  )
  const maxNumber = [...usedIds].reduce((max, id) => Math.max(max, parseCriteriaIdNumber(id)), 0)
  let nextNumber = maxNumber + 1
  let candidate = formatCriteriaId(nextNumber)

  while (usedIds.has(candidate.toLocaleLowerCase('tr-TR'))) {
    nextNumber += 1
    candidate = formatCriteriaId(nextNumber)
  }

  return candidate
}

function parseCriteriaIdNumber(id: string) {
  const match = id.match(/^(?:n)?(\d+)$/iu)
  return match ? Number(match[1]) : 0
}

function formatCriteriaId(number: number) {
  return `N${String(number).padStart(3, '0')}`.slice(-4)
}

function isDefaultTitleVariant(title: string | null | undefined, baseTitle: string) {
  const normalized = (title || '').trim()
  return (
    normalized === baseTitle || new RegExp(`^${escapeRegExp(baseTitle)}\\d+$`, 'u').test(normalized)
  )
}

function escapeRegExp(value: string) {
  return value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
}

export function toCriteriaForm(item: WorkflowCriteriaDto): WorkflowCriteriaForm {
  const sharedPerson = item.approver || ''

  return {
    ...emptyCriteria(item.kind),
    ...item,
    approver: sharedPerson,
    nextOnStart: item.nextOnStart || '',
    nextOnTrue: item.nextOnTrue || '',
    nextOnFalse: item.nextOnFalse || '',
    nextOnApprove: item.nextOnApprove || '',
    nextOnReject: item.nextOnReject || '',
    compareOutcomes: item.compareOutcomes?.length
      ? item.compareOutcomes.map(toCompareOutcomeForm)
      : emptyCriteria(item.kind).compareOutcomes,
  }
}

export function normalizeCriteria(item: WorkflowCriteriaForm): SaveCriteriaInput {
  const sharedPerson = item.kind === 'Approval' || item.kind === 'Inform' ? item.approver || '' : ''
  const compareOutcomes = (item.compareOutcomes || [])
    .slice(0, 4)
    .filter((outcome) => outcome.label?.trim())
    .map(normalizeCompareOutcome)
  const firstCompareColumn = compareOutcomes
    .flatMap((outcome) => outcome.conditions || [])
    .find((condition) => condition.compareColumn)?.compareColumn

  return {
    id: item.id || null,
    listFormCode: item.listFormCode || '',
    kind: item.kind || 'Compare',
    title: item.title || defaultTitle(item.kind || 'Compare'),
    compareColumn: firstCompareColumn || item.compareColumn || 'Price',
    compareOperator: item.compareOperator || '>',
    compareValue: Number(item.compareValue || 0),
    approver: sharedPerson,
    nextOnStart: item.nextOnStart || '',
    nextOnTrue: compareOutcomes[0]?.targetId || item.nextOnTrue || '',
    nextOnFalse: compareOutcomes[1]?.targetId || item.nextOnFalse || '',
    nextOnApprove: item.nextOnApprove || '',
    nextOnReject: item.nextOnReject || '',
    positionX: Number(item.positionX || 32),
    positionY: Number(item.positionY || 150),
    compareOutcomes,
  }
}

export function defaultTitle(kind: string) {
  return (
    {
      Start: 'App.WorkflowKind.Start',
      Compare: 'App.WorkflowKind.Compare',
      Approval: 'App.WorkflowKind.Approval',
      Inform: 'App.WorkflowKind.Inform',
      End: 'App.WorkflowKind.End',
    }[kind] ?? 'App.WorkflowKind.Step'
  )
}

/**
 * Node basliklari lokalizasyon anahtari olarak uretilir ve benzersizlik icin
 * sonuna sira numarasi eklenir (`App.WorkflowKind.Approval1`). Bu yuzden ham
 * baslik dogrudan `translate` edilemez; once numara ayrilir, anahtar cevrilir,
 * numara tekrar eklenir. Anahtar bulunamazsa ham baslik gosterilir.
 */
const LOCALIZATION_KEY_PATTERN = /^[A-Za-z0-9_]+(?:\.[A-Za-z0-9_]+)+$/u

export function translateWorkflowLabel(
  title: string | null | undefined,
  translate: (key: string) => string,
) {
  const raw = String(title ?? '').trim()
  if (!raw) return ''

  const match = /^(.*?)(\d*)$/u.exec(raw)
  const base = (match?.[1] || raw).trim()
  const suffix = match?.[2] || ''

  if (!LOCALIZATION_KEY_PATTERN.test(base)) return raw

  const translated = translate('::' + base)
  if (!translated || translated === base) return raw

  return `${translated}${suffix}`
}

export function emptyCompareOutcome1(label = 'Durum', compareColumn = 'Price'): CompareOutcomeDto {
  return {
    label,
    targetId: '',
    conditions: [{ compareColumn, compareOperator: '>', compareValue: 5000 }],
  }
}

export function emptyCompareOutcome2(label = 'Durum', compareColumn = 'Price'): CompareOutcomeDto {
  return {
    label,
    targetId: '',
    conditions: [{ compareColumn, compareOperator: '<=', compareValue: 5000 }],
  }
}

export function toCompareOutcomeForm(
  outcome: Partial<CompareOutcomeDto> &
    Partial<WorkflowConditionDto> & {
      conditions?: Partial<WorkflowConditionDto>[]
    },
): CompareOutcomeDto {
  const conditions = outcome.conditions?.length
    ? outcome.conditions
    : [
        {
          compareColumn: outcome.compareColumn || 'Price',
          compareOperator: outcome.compareOperator || '>',
          compareValue: outcome.compareValue || 0,
        },
      ]

  return {
    label: outcome.label || '',
    targetId: outcome.targetId || '',
    conditions: conditions.map((condition) => ({
      compareColumn: condition.compareColumn || 'Price',
      compareOperator: condition.compareOperator || '>',
      compareValue: condition.compareValue ?? 0,
    })),
  }
}

export function normalizeCompareOutcome(
  outcome: Partial<CompareOutcomeDto> &
    Partial<WorkflowConditionDto> & {
      conditions?: Partial<WorkflowConditionDto>[]
    },
): CompareOutcomeDto {
  const conditions = (
    outcome.conditions?.length
      ? outcome.conditions
      : [
          {
            compareColumn: outcome.compareColumn || 'Price',
            compareOperator: outcome.compareOperator || '>',
            compareValue: outcome.compareValue || 0,
          },
        ]
  )
    .filter((condition) => condition.compareOperator && String(condition.compareValue ?? '') !== '')
    .map((condition) => ({
      compareColumn: condition.compareColumn || 'Price',
      compareOperator: condition.compareOperator || '>',
      compareValue: Number(condition.compareValue || 0),
    }))

  return {
    label: (outcome.label || '').trim(),
    targetId: outcome.targetId || null,
    conditions,
  }
}

export function compareOutcomeRuleText(
  outcome: Partial<CompareOutcomeDto> & Partial<WorkflowConditionDto>,
) {
  const conditions = outcome.conditions?.length
    ? outcome.conditions
    : outcome.compareOperator
      ? [
          {
            compareColumn: outcome.compareColumn,
            compareOperator: outcome.compareOperator,
            compareValue: outcome.compareValue,
          },
        ]
      : []

  return conditions.length
    ? conditions
        .map(
          (condition) =>
            `${condition.compareColumn} ${condition.compareOperator} ${formatCompactValue(condition.compareValue)}`,
        )
        .join(' ve ')
    : 'App.ListFormWorkflow.NoRule'
}

export function formatCompactValue(value: number | string | null | undefined) {
  return new Intl.NumberFormat('tr-TR', {
    maximumFractionDigits: 2,
  }).format(Number(value || 0))
}

export function criteriaSummary(item: WorkflowCriteriaDto) {
  if (item.kind === 'Compare') {
    return (
      (item.compareOutcomes || [])
        .map((outcome) => `${outcome.label}: ${compareOutcomeRuleText(outcome)}`)
        .join(' / ') || '-'
    )
  }
  if (item.kind === 'Approval' || item.kind === 'Inform') {
    return `${item.title} ${item.approver ? `- ${formatWorkflowApprovers(item.approver)}` : ''}`
  }
  return item.title
}

export function splitWorkflowApprovers(value?: string | null) {
  return String(value ?? '')
    .split(MULTIVALUE_DELIMITER)
    .map((item) => item.trim())
    .filter(Boolean)
}

export function formatWorkflowApprovers(value?: string | null) {
  return splitWorkflowApprovers(value).join(', ')
}

export function targetTitle(criteria: WorkflowCriteriaDto[], id?: string | null) {
  if (!id) return '-'
  const item = criteria.find((candidate) => candidate.id === id)
  return item ? `${item.id} - ${item.title}` : id
}

export function statusClass(status?: string) {
  if (status === 'Onay Bekliyor') return 'pending'
  if (status === 'Bitti') return 'done'
  if (status === 'Bilgilendirildi') return 'info'
  return ''
}

export function formatMoney(value?: number | string | null) {
  return new Intl.NumberFormat('tr-TR', {
    style: 'currency',
    currency: 'TRY',
  }).format(Number(value || 0))
}