import { getToken } from '@/utils/auth'

export interface DeliveryTarget {
  id: number
  name: string
  target_type: string
  awx_inventory_id: number
  awx_template_id: number
  enabled: boolean
  metadata?: string
}

export interface DeliveryMountPath {
  path: string
  available_gi: number
  fstype?: string
}

export interface CreateMySQLDeliveryPayload {
  business_line_id: number
  target_id: number
  namespace: string
  instance_name: string
  mysql_version: string
  topology: string
  mysql_port?: number
  data_disk: string
  target_host?: string
  cpu_milli: number
  memory_mi: number
  storage_gi: number
  cpu_cores?: number
  memory_gb?: number
  storage_gb?: number
  timezone?: string
  lower_case_table_names?: number
  character_set?: string
  collation?: string
  max_connections?: string | number
  innodb_redo_log_capacity?: string
  innodb_flush_log_at_trx_commit?: number
  sync_binlog?: number
  innodb_io_capacity?: number
  long_query_time?: number
  binlog_expire_logs_seconds?: number
  max_binlog_size?: string
  mysql_root_password?: string
  mysql_admin_password?: string
}

export interface DeliveryTask {
  id: string
  business_line_id: number
  requested_by: number
  component: string
  target_type: string
  target_id: number
  namespace: string
  instance_name: string
  target_host?: string
  target_host_ip?: string
  mysql_port?: number
  status: string
  error_message?: string
  created_at: string
  updated_at: string
  started_at?: string
  finished_at?: string
}

export interface TaskEvent {
  id: number
  task_id: string
  from_state: string
  to_state: string
  stage?: string
  event_status?: string
  message: string
  created_at: string
}

export interface DeliveryTaskSnapshot {
  task: DeliveryTask
  events: TaskEvent[]
}

export interface DeploymentCredential {
  username: string
  host: string
  password: string
}

export interface MySQLServiceLedgerItem {
  name: string
  datacenter: string
  business_tag: string
  instances: number
  healthy: number
  address: string
  status: string
  status_class: string
  version: string
  namespace: string
}

export const deliveryApi = {
  async listTargets(): Promise<DeliveryTarget[]> {
    const data = await authRequest('/auth/api/v1/delivery/targets?component=mysql')
    return Array.isArray(data.items) ? data.items : []
  },

  async listTargetMountPaths(targetId: number, host: string): Promise<DeliveryMountPath[]> {
    const data = await authRequest(`/auth/api/v1/delivery/targets/${targetId}/hosts/${encodeURIComponent(host)}/mount-paths`)
    return Array.isArray(data.items) ? data.items : []
  },

  async createMySQL(payload: CreateMySQLDeliveryPayload): Promise<DeliveryTask> {
    const data = await authRequest('/auth/api/v1/delivery/mysql', {
      method: 'POST',
      headers: {
        'Idempotency-Key': createIdempotencyKey(payload),
      },
      body: JSON.stringify(payload),
    })
    return data.task
  },

  async listTasks(params: { businessLineId?: number; component?: string; active?: boolean } = {}): Promise<DeliveryTask[]> {
    const search = new URLSearchParams()
    if (params.businessLineId) search.set('business_line_id', String(params.businessLineId))
    if (params.component) search.set('component', params.component)
    if (params.active) search.set('active', 'true')
    const query = search.toString()
    const data = await authRequest(`/auth/api/v1/delivery/tasks${query ? `?${query}` : ''}`)
    return Array.isArray(data.items) ? data.items : []
  },

  async listMySQLServices(businessLineId: number): Promise<MySQLServiceLedgerItem[]> {
    const data = await authRequest(`/auth/api/v1/delivery/business-lines/${businessLineId}/mysql-services`)
    return Array.isArray(data.items) ? data.items : []
  },

  async getTask(taskId: string): Promise<{ task: DeliveryTask; events: TaskEvent[] }> {
    const data = await authRequest(`/auth/api/v1/delivery/tasks/${encodeURIComponent(taskId)}`)
    return {
      task: data.task,
      events: Array.isArray(data.events) ? data.events : [],
    }
  },

  async cancel(taskId: string): Promise<void> {
    await authRequest(`/auth/api/v1/delivery/tasks/${encodeURIComponent(taskId)}/cancel`, {
      method: 'POST',
    })
  },

  streamTask(taskId: string): EventSource {
    const token = getToken()
    const search = new URLSearchParams()
    if (token) search.set('access_token', token)
    const query = search.toString()
    return new EventSource(`/auth/api/v1/delivery/tasks/${encodeURIComponent(taskId)}/stream${query ? `?${query}` : ''}`)
  },

  async retryRollback(taskId: string): Promise<void> {
    await authRequest(`/auth/api/v1/delivery/tasks/${encodeURIComponent(taskId)}/rollback/retry`, {
      method: 'POST',
    })
  },

  async releaseRollback(taskId: string): Promise<void> {
    await authRequest(`/auth/api/v1/delivery/tasks/${encodeURIComponent(taskId)}/rollback/release`, {
      method: 'POST',
    })
  },

  async retryCloudDMRegistration(taskId: string): Promise<void> {
    await authRequest(`/auth/api/v1/delivery/tasks/${encodeURIComponent(taskId)}/clouddm/retry`, {
      method: 'POST',
    })
  },

  async revealCredentials(taskId: string): Promise<DeploymentCredential[]> {
    const data = await authRequest(`/auth/api/v1/delivery/tasks/${encodeURIComponent(taskId)}/credentials/reveal`, {
      method: 'POST',
    })
    return Array.isArray(data.items) ? data.items : []
  },
}

function createIdempotencyKey(payload: CreateMySQLDeliveryPayload) {
  return [
    'mysql',
    payload.business_line_id,
    payload.target_id,
    payload.namespace,
    payload.instance_name,
    Date.now(),
  ].join(':')
}

async function authRequest(path: string, init: RequestInit = {}) {
  const token = getToken()
  const response = await fetch(path, {
    ...init,
    headers: {
      Accept: 'application/json',
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
      ...init.headers,
    },
  })
  const text = await response.text()
  const data = parseResponseBody(text)
  if (!response.ok) {
    const message = data?.error || data?.message || text || `HTTP ${response.status}`
    throw new Error(message)
  }
  return data || {}
}

function parseResponseBody(text: string) {
  if (!text.trim()) {
    return {}
  }
  try {
    return JSON.parse(text)
  } catch {
    return { error: text }
  }
}