import { Handle, Node, NodeProps, Position } from '@xyflow/react'
import { useParams } from 'common'
import dayjs from 'dayjs'
import { Database, DatabaseBackup, HelpCircle, Loader2, MoreVertical } from 'lucide-react'
import Link from 'next/link'
import { parseAsBoolean, parseAsString, useQueryStates } from 'nuqs'
import { toast } from 'sonner'
import {
  Badge,
  Button,
  cn,
  copyToClipboard,
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
  Tooltip,
  TooltipContent,
  TooltipTrigger,
} from 'ui'
import { TimestampInfo } from 'ui-patterns'

import {
  ERROR_STATES,
  INIT_PROGRESS,
  LoadBalancerData,
  NODE_SEP,
  NODE_WIDTH,
  PrimaryNodeData,
  REGION_NODE_HEIGHT,
  REPLICA_STATUS,
  ReplicaNodeData,
} from './InstanceConfiguration.constants'
import { formatSeconds } from './InstanceConfiguration.utils'
import { metricColor } from './InstanceNode.utils'
import SparkBar from '@/components/ui/SparkBar'
import {
  DatabaseInitEstimations,
  ReplicaInitializationStatus,
  useReadReplicasStatusesQuery,
} from '@/data/read-replicas/replicas-status-query'
import { formatDatabaseID } from '@/data/read-replicas/replicas.utils'
import { useComputeMetrics } from '@/hooks/analytics/useComputeMetrics'
import { useIsFeatureEnabled } from '@/hooks/misc/useIsFeatureEnabled'
import { BASE_PATH } from '@/lib/constants'
import { useDatabaseSelectorStateSnapshot } from '@/state/database-selector'

export const LoadBalancerNode = ({ data }: NodeProps<Node<LoadBalancerData>>) => {
  const { ref } = useParams()
  const { numDatabases } = data

  return (
    <>
      <div className="flex flex-col rounded-sm bg-surface-100 border border-default">
        <div
          className="flex items-start justify-between p-3 gap-x-4"
          style={{ width: NODE_WIDTH / 2 - 10 }}
        >
          <div className="flex gap-x-3">
            <div className="min-w-8 h-8 bg-blue-600 border border-blue-800 rounded-md flex items-center justify-center">
              <Database size={16} />
            </div>
            <div className="flex flex-col gap-y-0.5">
              <p className="text-sm">API Load Balancer</p>
              <p className="text-sm text-foreground-light">
                Distributes incoming API requests across{' '}
                <span className="text-foreground">{numDatabases} databases</span>
              </p>
            </div>
          </div>
          <DropdownMenu>
            <DropdownMenuTrigger asChild>
              <Button type="text" icon={<MoreVertical />} className="px-1" />
            </DropdownMenuTrigger>
            <DropdownMenuContent className="w-40" side="bottom" align="end">
              <DropdownMenuItem asChild className="gap-x-2">
                <Link href={`/project/${ref}/integrations/data_api/overview?source=load-balancer`}>
                  View API URL
                </Link>
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        </div>
      </div>
      <Handle type="source" position={Position.Bottom} style={{ background: 'transparent' }} />
    </>
  )
}

export const PrimaryNode = ({ data }: NodeProps<Node<PrimaryNodeData>>) => {
  // [Joshen] Just FYI Handles cannot be conditionally rendered
  const { region, computeSize, numReplicas, numRegions, hasLoadBalancer } = data
  const { ref } = useParams()

  const { projectHomepageShowInstanceSize } = useIsFeatureEnabled([
    'project_homepage:show_instance_size',
  ])

  const {
    cpu,
    disk,
    memory,
    connections,
    isLoading: metricsLoading,
    isError: metricsError,
  } = useComputeMetrics({
    projectRef: ref,
  })

  const observabilityUrl = `/project/${ref}/observability/database`

  return (
    <>
      <Handle
        type="target"
        position={Position.Top}
        className={!hasLoadBalancer ? 'opacity-0' : ''}
        style={{ background: 'transparent' }}
      />
      <div className="flex flex-col rounded-sm bg-surface-100 border border-default">
        <div
          className="flex items-start justify-between p-3"
          style={{ width: NODE_WIDTH / 2 - 10 }}
        >
          <div className="flex gap-x-3">
            <div className="w-8 h-8 bg-brand-500 border border-brand-600 rounded-md flex items-center justify-center">
              <Database size={16} />
            </div>
            <div className="flex flex-col gap-y-0.5">
              <p className="text-sm">Primary Database</p>
              <p className="flex items-center gap-x-1">
                <span className="text-sm text-foreground-light">{region.name}</span>
              </p>
              <p className="flex items-center gap-x-1">
                <Tooltip>
                  <TooltipTrigger asChild>
                    <span
                      className="text-sm transition text-foreground-light hover:text-foreground"
                      onClick={async () =>
                        await copyToClipboard(region.region, () => toast('Copied project region'))
                      }
                    >
                      {region.region}
                    </span>
                  </TooltipTrigger>
                  <TooltipContent side="bottom">Click to copy</TooltipContent>
                </Tooltip>
                {projectHomepageShowInstanceSize && (
                  <>
                    <span className="text-sm text-foreground-lighter">·</span>
                    <span className="text-sm text-foreground-light">{computeSize}</span>
                  </>
                )}
              </p>
            </div>
          </div>
          <img
            alt="region icon"
            className="w-8 rounded-xs mt-0.5"
            src={`${BASE_PATH}/img/regions/${region.region}.svg`}
          />
        </div>
        {numReplicas > 0 && (
          <div className="border-t p-3 py-2">
            <p className="text-sm text-foreground-light">
              <span className="text-foreground">
                {numReplicas} replica{numReplicas > 1 ? 's' : ''}
              </span>{' '}
              deployed across{' '}
              <span className="text-foreground">
                {numRegions} region{numRegions > 1 ? 's' : ''}
              </span>
            </p>
          </div>
        )}
        <Tooltip>
          <TooltipTrigger asChild>
            <Link
              href={observabilityUrl}
              className="border-t px-3 py-2 hover:bg-surface-200 transition flex items-center gap-x-3 text-xs"
            >
              {metricsLoading ? (
                <div className="h-3 w-44 rounded-sm bg-surface-300 animate-pulse" />
              ) : metricsError ? (
                <span className="text-foreground-lighter">Metrics unavailable</span>
              ) : (
                <>
                  <span>
                    CPU <span className={metricColor(cpu)}>{cpu.toFixed(0)}%</span>
                  </span>
                  <span className="text-foreground-lighter">·</span>
                  <span>
                    Disk <span className={metricColor(disk)}>{disk.toFixed(0)}%</span>
                  </span>
                  <span className="text-foreground-lighter">·</span>
                  <span>
                    RAM <span className={metricColor(memory)}>{memory.toFixed(0)}%</span>
                  </span>
                  {connections.max > 0 && (
                    <>
                      <span className="text-foreground-lighter">·</span>
                      <span className="text-foreground-light">
                        {connections.peak}/{connections.max} conns
                      </span>
                    </>
                  )}
                </>
              )}
            </Link>
          </TooltipTrigger>
          <TooltipContent side="bottom">Go to Database Report</TooltipContent>
        </Tooltip>
      </div>
      <Handle
        type="source"
        position={Position.Bottom}
        className={numReplicas === 0 ? 'opacity-0' : ''}
        style={{ background: 'transparent' }}
      />
    </>
  )
}

export const ReplicaNode = ({ data }: NodeProps<Node<ReplicaNodeData>>) => {
  const { ref } = useParams()
  const { id, region, computeSize, status, inserted_at } = data
  const { projectHomepageShowInstanceSize } = useIsFeatureEnabled([
    'project_homepage:show_instance_size',
  ])

  const state = useDatabaseSelectorStateSnapshot()
  const [, setConnect] = useQueryStates({
    showConnect: parseAsBoolean.withDefault(false),
    source: parseAsString,
  })

  const { data: databaseStatuses } = useReadReplicasStatusesQuery({ projectRef: ref })
  const { replicaInitializationStatus } =
    (databaseStatuses ?? []).find((db) => db.identifier === id) || {}

  const {
    status: initStatus,
    progress,
    estimations,
    error,
  } = (replicaInitializationStatus as {
    status?: string
    progress?: string
    estimations?: DatabaseInitEstimations
    error?: string
  }) ?? { status: undefined, progress: undefined, estimations: undefined, error: undefined }

  const created = dayjs(inserted_at).format('DD MMM YYYY')
  const stage = progress !== undefined ? Number(progress.split('_')[0]) : 0
  const stagePercent = stage / (Object.keys(INIT_PROGRESS).length - 1)

  const isInTransition =
    (
      [
        REPLICA_STATUS.UNKNOWN,
        REPLICA_STATUS.COMING_UP,
        REPLICA_STATUS.GOING_DOWN,
        REPLICA_STATUS.RESTORING,
        REPLICA_STATUS.RESTARTING,
        REPLICA_STATUS.RESIZING,
        REPLICA_STATUS.INIT_READ_REPLICA,
      ] as string[]
    ).includes(status) || initStatus === ReplicaInitializationStatus.InProgress

  return (
    <>
      <Handle type="target" position={Position.Top} style={{ background: 'transparent' }} />
      <div
        className="flex justify-between items-start rounded-sm bg-surface-100 border border-default p-3"
        style={{ width: NODE_WIDTH / 2 - 10 }}
      >
        <div className="flex gap-x-3">
          <div
            className={cn(
              'w-8 h-8 border rounded-md flex items-center justify-center',
              status === REPLICA_STATUS.ACTIVE_HEALTHY &&
                initStatus === ReplicaInitializationStatus.Completed
                ? 'bg-brand-400 border-brand-500'
                : 'bg-surface-100 border-foreground/20'
            )}
          >
            {isInTransition ? (
              <Loader2 className="animate-spin" size={16} />
            ) : (
              <DatabaseBackup size={16} />
            )}
          </div>
          <div className="flex flex-col gap-y-0.5">
            <div className="flex items-center gap-x-2">
              <p className="text-sm truncate">
                Replica {id.length > 0 && `(ID: ${formatDatabaseID(id)})`}
              </p>
              {initStatus === ReplicaInitializationStatus.InProgress ||
              status === REPLICA_STATUS.COMING_UP ||
              status === REPLICA_STATUS.UNKNOWN ||
              status === REPLICA_STATUS.INIT_READ_REPLICA ? (
                <Badge>Coming up</Badge>
              ) : initStatus === ReplicaInitializationStatus.Failed ||
                status === REPLICA_STATUS.INIT_READ_REPLICA_FAILED ? (
                <>
                  <Badge variant="destructive">Init failed</Badge>
                  <Tooltip>
                    <TooltipTrigger>
                      <HelpCircle size={16} />
                    </TooltipTrigger>
                    <TooltipContent
                      side="bottom"
                      align="end"
                      alignOffset={-70}
                      className="w-60 text-center"
                    >
                      Replica failed to initialize. Please drop this replica and spin up a new one.
                    </TooltipContent>
                  </Tooltip>
                </>
              ) : status === REPLICA_STATUS.GOING_DOWN ? (
                <Badge>Going down</Badge>
              ) : status === REPLICA_STATUS.RESTARTING ? (
                <Badge>Restarting</Badge>
              ) : status === REPLICA_STATUS.RESIZING ? (
                <Badge>Resizing</Badge>
              ) : status === REPLICA_STATUS.ACTIVE_HEALTHY ? (
                <Badge variant="success">Healthy</Badge>
              ) : (
                <Badge variant="warning">Unhealthy</Badge>
              )}
            </div>
            <div className="my-0.5">
              <p className="text-sm text-foreground-light">{region.name}</p>
              <p className="flex text-sm text-foreground-light items-center gap-x-1">
                <Tooltip>
                  <TooltipTrigger asChild>
                    <span
                      className="text-sm transition text-foreground-light hover:text-foreground"
                      onClick={async () =>
                        await copyToClipboard(region.region, () => toast('Copied replica region'))
                      }
                    >
                      {region.region}
                    </span>
                  </TooltipTrigger>
                  <TooltipContent side="bottom">Click to copy</TooltipContent>
                </Tooltip>
                {projectHomepageShowInstanceSize && !!computeSize && (
                  <>
                    <span className="text-foreground-lighter">·</span>
                    <span>{computeSize}</span>
                  </>
                )}
              </p>
            </div>
            {initStatus === ReplicaInitializationStatus.InProgress && progress !== undefined ? (
              <Tooltip>
                <TooltipTrigger asChild>
                  <div className="w-56">
                    <SparkBar
                      labelBottom={INIT_PROGRESS[progress as keyof typeof INIT_PROGRESS]}
                      labelBottomClass="text-xs normal-nums! text-foreground-light"
                      type="horizontal"
                      value={stagePercent * 100}
                      max={100}
                      barClass="bg-brand"
                    />
                  </div>
                </TooltipTrigger>
                {estimations !== undefined && (
                  <TooltipContent asChild side="bottom">
                    <div className="w-56">
                      <p className="text-foreground-light mb-0.5">Duration estimates:</p>
                      {estimations.baseBackupDownloadEstimateSeconds !== undefined && (
                        <p>
                          Base backup download:{' '}
                          {formatSeconds(estimations.baseBackupDownloadEstimateSeconds)}
                        </p>
                      )}
                      {estimations.walArchiveReplayEstimateSeconds !== undefined && (
                        <p>
                          WAL archive replay:{' '}
                          {formatSeconds(estimations.walArchiveReplayEstimateSeconds)}
                        </p>
                      )}
                    </div>
                  </TooltipContent>
                )}
              </Tooltip>
            ) : error !== undefined ? (
              <p className="text-sm text-foreground-light">
                Error: {ERROR_STATES[error as keyof typeof ERROR_STATES]}
              </p>
            ) : (
              <p className="text-sm text-foreground-light">
                Created:{' '}
                <TimestampInfo className="text-sm" utcTimestamp={inserted_at} label={created} />
              </p>
            )}
          </div>
        </div>
        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button type="text" icon={<MoreVertical />} className="px-1" />
          </DropdownMenuTrigger>
          <DropdownMenuContent className="w-40" side="bottom" align="end">
            <DropdownMenuItem
              className="gap-x-2"
              onClick={() => {
                setConnect({ showConnect: true, source: id })
                state.setSelectedDatabaseId(id)
              }}
            >
              View connection string
            </DropdownMenuItem>
            <DropdownMenuSeparator />
            <DropdownMenuItem className="gap-x-2">
              <Link href={`/project/${ref}/database/replication/replica/${id}`}>
                Manage replica
              </Link>
            </DropdownMenuItem>
          </DropdownMenuContent>
        </DropdownMenu>
      </div>
    </>
  )
}

export const RegionNode = ({ data }: any) => {
  const { region, numReplicas } = data
  const regionNodeWidth =
    20 + (NODE_WIDTH / 2 - 10) * numReplicas + (numReplicas - 1) * (NODE_SEP + 10)

  return (
    <div
      className="relative flex justify-between rounded-sm bg-black/10 border border-default border-white/10 border-2 p-3"
      style={{ width: regionNodeWidth, height: REGION_NODE_HEIGHT }}
    >
      <div className="absolute bottom-2 flex items-center justify-between gap-x-2">
        <img
          alt="region icon"
          className="w-5 rounded-xs"
          src={`${BASE_PATH}/img/regions/${region.region}.svg`}
        />
        <p className="text-sm">{region.name}</p>
      </div>
    </div>
  )
}