/**
 * Pure functions for custom field resolution, merging, and deduplication.
 *
 * Extracted from ComponentItem.vue and PieceItem.vue which had ~350 LOC
 * of identical custom field logic duplicated between them.
 */

// ---------------------------------------------------------------------------
// Field key / identity helpers
// ---------------------------------------------------------------------------

export function fieldKeyFromNameAndType(name: unknown, type: unknown): string | null {
  const normalizedName = typeof name === 'string' ? name.trim().toLowerCase() : ''
  const normalizedType = typeof type === 'string' ? type.trim().toLowerCase() : ''
  return normalizedName ? `${normalizedName}::${normalizedType}` : null
}

export function resolveOrderIndex(field: any): number {
  if (!field || typeof field !== 'object') return 0
  if (typeof field.orderIndex === 'number') return field.orderIndex
  if (field.customField && typeof field.customField.orderIndex === 'number') return field.customField.orderIndex
  return 0
}

// ---------------------------------------------------------------------------
// Field accessors
// ---------------------------------------------------------------------------

export function resolveFieldKey(field: any, index: number): string {
  return field?.id ?? field?.customFieldValueId ?? field?.customFieldId ?? field?.name ?? `field-${index}`
}

export function resolveFieldId(field: any): string | null {
  return field?.customFieldValueId ?? null
}

export function resolveFieldName(field: any): string {
  return field?.name ?? 'Champ'
}

export function resolveFieldType(field: any): string {
  return field?.type ?? 'text'
}

export function resolveFieldOptions(field: any): string[] {
  return field?.options ?? []
}

export function resolveFieldRequired(field: any): boolean {
  return !!field?.required
}

export function resolveFieldReadOnly(field: any): boolean {
  return !!field?.readOnly
}

export function resolveCustomFieldId(field: any): string | null {
  return field?.customFieldId ?? field?.id ?? field?.customField?.id ?? null
}

export function buildCustomFieldMetadata(field: any) {
  return {
    customFieldName: resolveFieldName(field),
    customFieldType: resolveFieldType(field),
    customFieldRequired: resolveFieldRequired(field),
    customFieldOptions: resolveFieldOptions(field),
  }
}

export function formatFieldDisplayValue(field: any): string {
  const type = resolveFieldType(field)
  const rawValue = field?.value ?? ''
  if (type === 'boolean') {
    const normalized = String(rawValue).toLowerCase()
    if (normalized === 'true') return 'Oui'
    if (normalized === 'false') return 'Non'
  }
  return rawValue || 'Non défini'
}

// ---------------------------------------------------------------------------
// Custom field ID resolution against candidate pool
// ---------------------------------------------------------------------------

export function ensureCustomFieldId(field: any, candidateFields: any[]): string | null {
  const existingId = resolveCustomFieldId(field)
  if (existingId) return existingId

  const name = resolveFieldName(field)
  if (!name || name === 'Champ') return null

  const matches = candidateFields.filter((candidate) => {
    if (!candidate || typeof candidate !== 'object') return false
    const candidateId = candidate.id || candidate.customFieldId
    if (candidateId && (candidateId === field?.id || candidateId === field?.customFieldId)) return true
    return typeof candidate.name === 'string' && candidate.name === name
  })

  if (matches.length) {
    const withId = matches.find((c) => c?.id || c?.customFieldId) || matches[0]
    const id = withId?.id || withId?.customFieldId || null
    if (id) field.customFieldId = id
    if (!field.customField && typeof withId === 'object') field.customField = withId
    return id
  }

  return null
}

// ---------------------------------------------------------------------------
// Structure extraction
// ---------------------------------------------------------------------------

export function extractStructureCustomFields(structure: any): any[] {
  if (!structure || typeof structure !== 'object') return []
  const customFields = structure.customFields
  return Array.isArray(customFields) ? customFields : []
}

// ---------------------------------------------------------------------------
// Deduplication & merge
// ---------------------------------------------------------------------------

export function deduplicateFieldDefinitions(definitions: any[]): any[] {
  const result: any[] = []
  const seenIds = new Set<string>()
  const seenNames = new Set<string>()

  const orderedDefinitions = (Array.isArray(definitions) ? definitions.slice() : [])
    .sort((a, b) => resolveOrderIndex(a) - resolveOrderIndex(b))

  orderedDefinitions.forEach((field) => {
    if (!field || typeof field !== 'object') return
    const id = field.id ?? field.customFieldId ?? field.customField?.id ?? null
    const nameKey = fieldKeyFromNameAndType(field.name, field.type)
    // Deduplicate by name+type (primary) AND by id — a field with the same
    // name+type is the same field even when stored with different IDs.
    if (nameKey && seenNames.has(nameKey)) return
    if (id && seenIds.has(id)) return
    if (id) seenIds.add(id)
    if (nameKey) seenNames.add(nameKey)
    field.orderIndex = resolveOrderIndex(field)
    result.push(field)
  })

  return result
}

export function mergeFieldDefinitionsWithValues(definitions: any[], values: any[]): any[] {
  const definitionList = Array.isArray(definitions) ? definitions : []
  const valueList = Array.isArray(values) ? values : []

  const valueMap = new Map<string, any>()
  valueList.forEach((entry) => {
    if (!entry || typeof entry !== 'object') return
    const fieldId = entry.customField?.id ?? entry.customFieldId ?? null
    if (fieldId) valueMap.set(fieldId, entry)
    const nameKey = fieldKeyFromNameAndType(entry.customField?.name, entry.customField?.type)
    if (nameKey) valueMap.set(nameKey, entry)
  })

  const merged = definitionList.map((field) => {
    if (!field || typeof field !== 'object') return field

    const fieldId = resolveCustomFieldId(field)
    const nameKey = fieldKeyFromNameAndType(resolveFieldName(field), resolveFieldType(field))
    const matchedValue = (fieldId ? valueMap.get(fieldId) : undefined) ?? (nameKey ? valueMap.get(nameKey) : undefined)

    if (!matchedValue) {
      return { ...field, value: field?.value ?? '', orderIndex: resolveOrderIndex(field) }
    }

    const resolvedOrder = Math.min(resolveOrderIndex(field), resolveOrderIndex(matchedValue.customField))
    return {
      ...field,
      customFieldValueId: matchedValue.id ?? field.customFieldValueId ?? null,
      customFieldId: matchedValue.customField?.id ?? matchedValue.customFieldId ?? fieldId ?? null,
      customField: matchedValue.customField ?? field.customField ?? null,
      value: matchedValue.value ?? field.value ?? '',
      orderIndex: resolvedOrder,
    }
  })

  valueList.forEach((entry) => {
    if (!entry || typeof entry !== 'object') return

    const fieldId = entry.customField?.id ?? entry.customFieldId ?? null
    const nameKey = fieldKeyFromNameAndType(entry.customField?.name, entry.customField?.type)

    const exists = merged.some((field) => {
      if (!field || typeof field !== 'object') return false
      if (field.customFieldValueId && field.customFieldValueId === entry.id) return true
      const existingId = resolveCustomFieldId(field)
      if (fieldId && existingId && existingId === fieldId) return true
      if (!fieldId && nameKey) {
        return fieldKeyFromNameAndType(resolveFieldName(field), resolveFieldType(field)) === nameKey
      }
      return false
    })

    if (!exists) {
      merged.push({
        customFieldValueId: entry.id ?? null,
        customFieldId: fieldId,
        name: entry.customField?.name ?? '',
        type: entry.customField?.type ?? 'text',
        required: entry.customField?.required ?? false,
        options: entry.customField?.options ?? [],
        value: entry.value ?? '',
        customField: entry.customField ?? null,
        orderIndex: resolveOrderIndex(entry.customField),
      })
    }
  })

  return merged.sort((a, b) => resolveOrderIndex(a) - resolveOrderIndex(b))
}

export function dedupeMergedFields(fields: any[]): any[] {
  if (!Array.isArray(fields) || fields.length <= 1) {
    return Array.isArray(fields)
      ? fields.slice().sort((a, b) => resolveOrderIndex(a) - resolveOrderIndex(b))
      : []
  }

  const seenById = new Map<string, any>()
  const seenByName = new Map<string, any>()
  const result: any[] = []

  const orderedFields = fields.slice().sort((a, b) => resolveOrderIndex(a) - resolveOrderIndex(b))

  orderedFields.forEach((field) => {
    if (!field || typeof field !== 'object') return

    const rawName = resolveFieldName(field)
    const normalizedName = typeof rawName === 'string' ? rawName.trim() : ''
    if (!normalizedName) return

    field.name = normalizedName
    field.type = field.type || resolveFieldType(field)

    const fieldId = resolveCustomFieldId(field)
    const nameKey = fieldKeyFromNameAndType(normalizedName, field.type)

    // Check duplicates by name+type first (same field can have different IDs)
    const existing = (nameKey ? seenByName.get(nameKey) : undefined) ?? (fieldId ? seenById.get(fieldId) : undefined)

    if (!existing) {
      field.orderIndex = resolveOrderIndex(field)
      if (fieldId) seenById.set(fieldId, field)
      if (nameKey) seenByName.set(nameKey, field)
      result.push(field)
      return
    }

    const existingHasValue = existing.value !== undefined && existing.value !== null && String(existing.value).trim().length > 0
    const incomingHasValue = field.value !== undefined && field.value !== null && String(field.value).trim().length > 0

    if (!existingHasValue && incomingHasValue) {
      Object.assign(existing, field)
      existing.orderIndex = Math.min(resolveOrderIndex(existing), resolveOrderIndex(field))
      if (fieldId) seenById.set(fieldId, existing)
      if (nameKey) seenByName.set(nameKey, existing)
    }
  })

  return result.sort((a, b) => resolveOrderIndex(a) - resolveOrderIndex(b))
}

// ---------------------------------------------------------------------------
// Definition sources builder
// ---------------------------------------------------------------------------

export function buildDefinitionSources(entity: any, entityType: 'composant' | 'piece'): any[] {
  const definitions: any[] = []
  const pushFields = (collection: any) => {
    if (Array.isArray(collection)) definitions.push(...collection)
  }

  if (entityType === 'composant') {
    const type = entity.typeComposant || {}

    pushFields(entity.customFields)
    pushFields(entity.definition?.customFields)
    pushFields(type.customFields)

    ;[
      entity.definition?.structure,
      type.structure,
    ].forEach((structure) => {
      const fields = extractStructureCustomFields(structure)
      if (fields.length) definitions.push(...fields)
    })
  } else {
    const type = entity.typePiece || {}

    pushFields(entity.customFields)
    pushFields(entity.definition?.customFields)
    pushFields(type.customFields)

    ;[
      entity.definition?.structure,
      type.structure,
    ].forEach((structure) => {
      const fields = extractStructureCustomFields(structure)
      if (fields.length) definitions.push(...fields)
    })
  }

  return deduplicateFieldDefinitions(definitions)
}

// ---------------------------------------------------------------------------
// Candidate fields builder
// ---------------------------------------------------------------------------

export function buildCandidateCustomFields(entity: any, definitionSources: any[]): any[] {
  const map = new Map<string, any>()
  const register = (collection: any[]) => {
    if (!Array.isArray(collection)) return
    collection.forEach((item) => {
      if (!item || typeof item !== 'object') return
      const id = item.id || item.customFieldId
      const name = typeof item.name === 'string' ? item.name : null
      const key = id || (name ? `${name}::${item.type ?? ''}` : null)
      if (!key || map.has(key)) return
      map.set(key, item)
    })
  }

  register((entity.customFieldValues || []).map((value: any) => value?.customField))
  register(definitionSources)

  return Array.from(map.values())
}