import type {
  EntityType,
  AttributeDefinition,
  AttributeDefinitionFilters,
  CreateAttributeDefinitionRequest,
  UpdateAttributeDefinitionRequest,
  AttributeValues,
  SetAttributeValuesRequest,
} from './types'

const API_BASE = '/api'

/**
 * Fetch attribute definitions for an entity type
 */
export async function fetchAttributeDefinitions(
  entityType: EntityType,
  filters?: AttributeDefinitionFilters
): Promise<AttributeDefinition[]> {
  const params = new URLSearchParams({ entityType })
  if (filters?.category) params.set('category', filters.category)
  if (filters?.isActive !== undefined) params.set('isActive', String(filters.isActive))

  const response = await fetch(`${API_BASE}/attribute-definitions?${params}`)
  if (!response.ok) {
    throw new Error(`Failed to fetch attribute definitions: ${response.statusText}`)
  }
  return response.json()
}

/**
 * Fetch a single attribute definition by code
 */
export async function fetchAttributeDefinitionByCode(
  code: string
): Promise<AttributeDefinition> {
  const response = await fetch(`${API_BASE}/attribute-definitions/code/${code}`)
  if (!response.ok) {
    throw new Error(`Failed to fetch attribute definition: ${response.statusText}`)
  }
  return response.json()
}

/**
 * Fetch a single attribute definition by ID
 */
export async function fetchAttributeDefinitionById(
  id: string
): Promise<AttributeDefinition> {
  const response = await fetch(`${API_BASE}/attribute-definitions/${id}`)
  if (!response.ok) {
    throw new Error(`Failed to fetch attribute definition: ${response.statusText}`)
  }
  return response.json()
}

/**
 * Create a new attribute definition
 */
export async function createAttributeDefinition(
  data: CreateAttributeDefinitionRequest
): Promise<AttributeDefinition> {
  const response = await fetch(`${API_BASE}/attribute-definitions`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data),
  })
  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: response.statusText }))
    throw new Error(error.message || 'Failed to create attribute definition')
  }
  return response.json()
}

/**
 * Update an attribute definition
 */
export async function updateAttributeDefinition(
  id: string,
  data: UpdateAttributeDefinitionRequest
): Promise<AttributeDefinition> {
  const response = await fetch(`${API_BASE}/attribute-definitions/${id}`, {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data),
  })
  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: response.statusText }))
    throw new Error(error.message || 'Failed to update attribute definition')
  }
  return response.json()
}

/**
 * Delete an attribute definition
 */
export async function deleteAttributeDefinition(id: string): Promise<void> {
  const response = await fetch(`${API_BASE}/attribute-definitions/${id}`, {
    method: 'DELETE',
  })
  if (!response.ok) {
    throw new Error(`Failed to delete attribute definition: ${response.statusText}`)
  }
}

/**
 * Fetch all entity types
 */
export async function fetchEntityTypes(): Promise<EntityType[]> {
  const response = await fetch(`${API_BASE}/attribute-definitions/meta/entity-types`)
  if (!response.ok) {
    throw new Error(`Failed to fetch entity types: ${response.statusText}`)
  }
  return response.json()
}

/**
 * Fetch categories for an entity type
 */
export async function fetchAttributeCategories(
  entityType: EntityType
): Promise<string[]> {
  const response = await fetch(
    `${API_BASE}/attribute-definitions/meta/categories?entityType=${entityType}`
  )
  if (!response.ok) {
    throw new Error(`Failed to fetch categories: ${response.statusText}`)
  }
  return response.json()
}

/**
 * Fetch all attribute values for an entity
 */
export async function fetchAttributeValues(
  entityType: EntityType,
  entityId: string
): Promise<AttributeValues> {
  const params = new URLSearchParams({ entityType, entityId })
  const response = await fetch(`${API_BASE}/attribute-values?${params}`)
  if (!response.ok) {
    throw new Error(`Failed to fetch attribute values: ${response.statusText}`)
  }
  return response.json()
}

/**
 * Fetch a single attribute value
 */
export async function fetchAttributeValue(
  entityType: EntityType,
  entityId: string,
  code: string
): Promise<unknown> {
  const params = new URLSearchParams({ entityType, entityId })
  const response = await fetch(`${API_BASE}/attribute-values/${code}?${params}`)
  if (!response.ok) {
    throw new Error(`Failed to fetch attribute value: ${response.statusText}`)
  }
  return response.json()
}

/**
 * Set multiple attribute values at once
 */
export async function setAttributeValues(
  entityType: EntityType,
  entityId: string,
  attributes: AttributeValues
): Promise<void> {
  const params = new URLSearchParams({ entityType, entityId })
  const body: SetAttributeValuesRequest = { attributes }
  const response = await fetch(`${API_BASE}/attribute-values?${params}`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  })
  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: response.statusText }))
    throw new Error(error.message || 'Failed to set attribute values')
  }
}

/**
 * Set a single attribute value
 */
export async function setAttributeValue(
  entityType: EntityType,
  entityId: string,
  code: string,
  value: unknown
): Promise<void> {
  const params = new URLSearchParams({ entityType, entityId })
  const response = await fetch(`${API_BASE}/attribute-values/${code}?${params}`, {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ value }),
  })
  if (!response.ok) {
    const error = await response.json().catch(() => ({ message: response.statusText }))
    throw new Error(error.message || 'Failed to set attribute value')
  }
}

/**
 * Delete an attribute value
 */
export async function deleteAttributeValue(
  entityType: EntityType,
  entityId: string,
  code: string
): Promise<void> {
  const params = new URLSearchParams({ entityType, entityId })
  const response = await fetch(`${API_BASE}/attribute-values/${code}?${params}`, {
    method: 'DELETE',
  })
  if (!response.ok) {
    throw new Error(`Failed to delete attribute value: ${response.statusText}`)
  }
}