import { zodResolver } from '@hookform/resolvers/zod'
import { PermissionAction } from '@supabase/shared-types/out/constants'
import { useQueryClient } from '@tanstack/react-query'
import { useDebounce } from '@uidotdev/usehooks'
import { useFlag, useParams } from 'common'
import { Check, DatabaseZap, DollarSign, Github, GitMerge, Loader2 } from 'lucide-react'
import Image from 'next/image'
import Link from 'next/link'
import { useRouter } from 'next/router'
import { useCallback, useEffect, useState } from 'react'
import { useForm } from 'react-hook-form'
import { toast } from 'sonner'
import {
  Badge,
  Button,
  cn,
  Dialog,
  DialogContent,
  DialogFooter,
  DialogHeader,
  DialogSection,
  DialogSectionSeparator,
  DialogTitle,
  Form,
  FormControl,
  FormField,
  Input,
  Label,
  Switch,
  Tooltip,
  TooltipContent,
  TooltipTrigger,
} from 'ui'
import { FormItemLayout } from 'ui-patterns/form/FormItemLayout/FormItemLayout'
import { ShimmeringLoader } from 'ui-patterns/ShimmeringLoader'
import * as z from 'zod'

import {
  estimateComputeSize,
  estimateDiskCost,
  estimateRestoreTime,
} from './BranchManagement.utils'
import { TaxDisclaimer } from '@/components/interfaces/Billing/TaxDisclaimer'
import { BranchingPITRNotice } from '@/components/layouts/AppLayout/EnableBranchingButton/BranchingPITRNotice'
import AlertError from '@/components/ui/AlertError'
import { ButtonTooltip } from '@/components/ui/ButtonTooltip'
import { InlineLink, InlineLinkClassName } from '@/components/ui/InlineLink'
import { UpgradeToPro } from '@/components/ui/UpgradeToPro'
import { useBranchCreateMutation } from '@/data/branches/branch-create-mutation'
import { useBranchesQuery } from '@/data/branches/branches-query'
import { DiskAttributesData, useDiskAttributesQuery } from '@/data/config/disk-attributes-query'
import { useCheckGithubBranchValidity } from '@/data/integrations/github-branch-check-query'
import { useGitHubConnectionsQuery } from '@/data/integrations/github-connections-query'
import { projectKeys } from '@/data/projects/keys'
import { DesiredInstanceSize, instanceSizeSpecs } from '@/data/projects/new-project.constants'
import { useProjectAddonsQuery } from '@/data/subscriptions/project-addons-query'
import { useCheckEntitlements } from '@/hooks/misc/useCheckEntitlements'
import { useAsyncCheckPermissions } from '@/hooks/misc/useCheckPermissions'
import { useSelectedOrganizationQuery } from '@/hooks/misc/useSelectedOrganization'
import { useSelectedProjectQuery } from '@/hooks/misc/useSelectedProject'
import { BASE_PATH, IS_PLATFORM } from '@/lib/constants'
import { useTrack } from '@/lib/telemetry/track'
import { useAppStateSnapshot } from '@/state/app-state'

export const CreateBranchModal = () => {
  const { ref } = useParams()
  const router = useRouter()
  const queryClient = useQueryClient()
  const { data: projectDetails } = useSelectedProjectQuery()
  const { data: selectedOrg } = useSelectedOrganizationQuery()
  const { showCreateBranchModal, setShowCreateBranchModal } = useAppStateSnapshot()

  const allowDataBranching = useFlag('allowDataBranching')

  const [isGitBranchValid, setIsGitBranchValid] = useState(false)

  const { can: canCreateBranch } = useAsyncCheckPermissions(
    PermissionAction.CREATE,
    'preview_branches'
  )

  const { hasAccess: hasAccessToBranching, isLoading: isLoadingEntitlement } =
    useCheckEntitlements('branching_limit')
  const promptPlanUpgrade = IS_PLATFORM && !hasAccessToBranching

  const isBranch = projectDetails?.parent_project_ref !== undefined
  const projectRef =
    projectDetails !== undefined ? (isBranch ? projectDetails.parent_project_ref : ref) : undefined

  const formId = 'create-branch-form'
  const FormSchema = z.object({
    branchName: z
      .string()
      .min(1, 'Branch name cannot be empty')
      .refine(
        (val) => /^[a-zA-Z0-9\-_]+$/.test(val),
        'Branch name can only contain alphanumeric characters, hyphens, and underscores.'
      )
      .refine(
        (val) => (branches ?? []).every((branch) => branch.name !== val),
        'A branch with this name already exists'
      ),
    gitBranchName: z.string().optional(),
    withData: z.boolean().default(false).optional(),
  })

  const form = useForm<z.infer<typeof FormSchema>>({
    mode: 'onSubmit',
    reValidateMode: 'onBlur',
    resolver: zodResolver(FormSchema),
    defaultValues: { branchName: '', gitBranchName: '', withData: false },
  })

  const { withData, gitBranchName } = form.watch()
  const debouncedGitBranchName = useDebounce(gitBranchName, 500)

  const {
    data: connections,
    error: connectionsError,
    isPending: isLoadingConnections,
    isSuccess: isSuccessConnections,
    isError: isErrorConnections,
  } = useGitHubConnectionsQuery(
    { organizationId: selectedOrg?.id },
    { enabled: showCreateBranchModal }
  )

  const { data: branches } = useBranchesQuery({ projectRef })
  const { data: addons, isSuccess: isSuccessAddons } = useProjectAddonsQuery(
    { projectRef },
    { enabled: showCreateBranchModal }
  )
  const computeAddon = addons?.selected_addons.find((addon) => addon.type === 'compute_instance')
  const computeSize = computeAddon
    ? (computeAddon.variant.identifier.split('ci_')[1] as DesiredInstanceSize)
    : undefined
  const hasPitrEnabled = (addons?.selected_addons ?? []).some((addon) => addon.type === 'pitr')

  const {
    data: disk,
    isPending: isLoadingDiskAttr,
    isError: isErrorDiskAttr,
  } = useDiskAttributesQuery({ projectRef }, { enabled: showCreateBranchModal && withData })
  const projectDiskAttributes = disk?.attributes ?? {
    type: 'gp3',
    size_gb: 0,
    iops: 0,
    throughput_mbps: 0,
  }
  // Branch disk is oversized to include backup files, it should be scaled back eventually.
  const branchDiskAttributes = {
    ...projectDiskAttributes,
    // [Joshen] JFYI for Qiao - this multiplier may eventually be dropped
    size_gb: Math.round(projectDiskAttributes.size_gb * 1.5),
  } as DiskAttributesData['attributes']
  const branchComputeSize = estimateComputeSize(projectDiskAttributes.size_gb, computeSize)
  const estimatedDiskCost = estimateDiskCost(branchDiskAttributes)

  const track = useTrack()

  const { mutate: checkGithubBranchValidity, isPending: isCheckingGHBranchValidity } =
    useCheckGithubBranchValidity({
      onError: () => {},
    })

  const { mutate: createBranch, isPending: isCreatingBranch } = useBranchCreateMutation({
    onSuccess: async (data) => {
      toast.success(`Successfully created preview branch "${data.name}"`)
      if (projectRef) {
        await queryClient.invalidateQueries({ queryKey: projectKeys.detail(projectRef) })
      }
      track('branch_create_button_clicked', {
        branchType: data.persistent ? 'persistent' : 'preview',
        gitlessBranching: !data.git_branch,
      })

      setShowCreateBranchModal(false)
      router.push(`/project/${data.project_ref}`)
    },
    onError: (error) => {
      toast.error(`Failed to create branch: ${error.message}`)
    },
  })

  // Fetch production/default branch to inspect git_branch linkage
  const githubConnection = connections?.find((connection) => connection.project.ref === projectRef)
  const prodBranch = branches?.find((branch) => branch.is_default)
  const [repoOwner, repoName] = githubConnection?.repository.name.split('/') ?? []
  const isFormValid = form.formState.isValid && (!gitBranchName || isGitBranchValid)

  const isDisabled =
    !isFormValid ||
    !canCreateBranch ||
    !isSuccessAddons ||
    (!!gitBranchName && !isSuccessConnections) ||
    isLoadingEntitlement ||
    !hasAccessToBranching ||
    isCreatingBranch ||
    isCheckingGHBranchValidity

  const tooltipText = promptPlanUpgrade ? 'Upgrade to unlock branching' : undefined

  const validateGitBranchName = useCallback(
    (branchName: string) => {
      if (!githubConnection) {
        return console.error(
          '[CreateBranchModal > validateGitBranchName] GitHub Connection is missing'
        )
      }

      const repositoryId = githubConnection.repository.id

      checkGithubBranchValidity(
        { repositoryId, branchName },
        {
          onSuccess: () => {
            if (form.getValues('gitBranchName') !== branchName) return

            // Check if another branch is already linked to this git branch
            const existingBranch = (branches ?? []).find((b) => b.git_branch === branchName)
            if (existingBranch) {
              setIsGitBranchValid(false)
              form.setError('gitBranchName', {
                message: `Branch "${existingBranch.name}" is already linked to git branch "${branchName}"`,
              })
              return
            }

            setIsGitBranchValid(true)
            form.clearErrors('gitBranchName')
          },
          onError: (error) => {
            if (form.getValues('gitBranchName') !== branchName) return
            setIsGitBranchValid(false)
            form.setError('gitBranchName', {
              message:
                error?.message ??
                `Unable to find branch "${branchName}" in ${repoOwner}/${repoName}`,
            })
          },
        }
      )
    },
    [githubConnection, form, checkGithubBranchValidity, repoOwner, repoName, branches]
  )

  const onSubmit = (data: z.infer<typeof FormSchema>) => {
    if (!projectRef) return console.error('Project ref is required')
    createBranch({
      projectRef,
      branchName: data.branchName,
      is_default: false,
      ...(data.withData ? { desired_instance_size: computeSize } : {}),
      ...(data.gitBranchName ? { gitBranch: data.gitBranchName } : {}),
      ...(allowDataBranching ? { withData: data.withData } : {}),
    })
  }

  const handleGitHubClick = () => {
    setShowCreateBranchModal(false)
    router.push(`/project/${projectRef}/settings/integrations`)
  }

  useEffect(() => {
    if (showCreateBranchModal) form.reset()
  }, [form, showCreateBranchModal])

  useEffect(() => {
    form.clearErrors('gitBranchName')
    if (githubConnection && debouncedGitBranchName) validateGitBranchName(debouncedGitBranchName)
  }, [debouncedGitBranchName, validateGitBranchName, form, githubConnection])

  return (
    <Dialog open={showCreateBranchModal} onOpenChange={setShowCreateBranchModal}>
      <DialogContent
        size="large"
        hideClose
        onOpenAutoFocus={(e) => {
          if (promptPlanUpgrade) e.preventDefault()
        }}
        aria-describedby={undefined}
      >
        <DialogHeader padding="small">
          <DialogTitle>Create a new preview branch</DialogTitle>
        </DialogHeader>
        <DialogSectionSeparator />

        <Form {...form}>
          <form id={formId} onSubmit={form.handleSubmit(onSubmit)}>
            {promptPlanUpgrade && (
              <UpgradeToPro
                fullWidth
                layout="vertical"
                source="create-branch"
                featureProposition="enable branching"
                primaryText="Upgrade to unlock branching"
                secondaryText="Create and test schema changes, functions, and more in a separate, temporary instance without affecting production."
                className="pb-5"
              />
            )}

            <DialogSection
              padding="medium"
              className={cn('space-y-4', promptPlanUpgrade && 'opacity-25 pointer-events-none')}
            >
              <FormField
                control={form.control}
                name="branchName"
                render={({ field }) => (
                  <FormItemLayout label="Preview Branch Name">
                    <FormControl>
                      <Input
                        {...field}
                        placeholder="e.g. staging, dev-feature-x"
                        autoComplete="off"
                      />
                    </FormControl>
                  </FormItemLayout>
                )}
              />

              {isLoadingConnections && (
                <div className="flex flex-col gap-y-2">
                  <ShimmeringLoader />
                  <ShimmeringLoader className="w-1/2" />
                </div>
              )}

              {isErrorConnections && (
                <AlertError
                  error={connectionsError}
                  subject="Failed to retrieve GitHub connection information"
                />
              )}

              {isSuccessConnections &&
                (githubConnection ? (
                  <FormField
                    control={form.control}
                    name="gitBranchName"
                    render={({ field }) => (
                      <FormItemLayout
                        label={
                          <div className="flex items-center justify-between w-full gap-4">
                            <span className="flex-1">Sync with Git branch</span>
                            <div className="flex items-center gap-2 text-sm">
                              <Image
                                className={cn('dark:invert')}
                                src={`${BASE_PATH}/img/icons/github-icon.svg`}
                                width={16}
                                height={16}
                                alt={`GitHub icon`}
                              />
                              <Link
                                href={`https://github.com/${repoOwner}/${repoName}`}
                                target="_blank"
                                rel="noreferrer"
                                className="text-foreground hover:underline"
                              >
                                {repoOwner}/{repoName}
                              </Link>
                            </div>
                          </div>
                        }
                        labelOptional="Optional"
                        description="Automatically deploy changes on every commit"
                      >
                        <div className="relative w-full">
                          <FormControl>
                            <Input
                              {...field}
                              placeholder="e.g. main, feat/some-feature"
                              autoComplete="off"
                              onChange={(e) => {
                                field.onChange(e)
                                setIsGitBranchValid(false)
                              }}
                            />
                          </FormControl>
                          <div className="absolute top-2.5 right-3 flex items-center gap-2">
                            {field.value ? (
                              isCheckingGHBranchValidity ? (
                                <Loader2 size={14} className="animate-spin" />
                              ) : isGitBranchValid ? (
                                <Check size={14} className="text-brand" strokeWidth={2} />
                              ) : null
                            ) : null}
                          </div>
                        </div>
                      </FormItemLayout>
                    )}
                  />
                ) : (
                  <div className="flex items-center gap-2 justify-between">
                    <div className="flex flex-col gap-1">
                      <Label>Sync with a GitHub branch</Label>
                      <p className="text-sm text-foreground-lighter">
                        Keep this preview branch in sync with a chosen GitHub branch
                      </p>
                    </div>
                    <Button type="default" icon={<Github />} onClick={handleGitHubClick}>
                      Configure
                    </Button>
                  </div>
                ))}

              {allowDataBranching && (
                <FormField
                  control={form.control}
                  name="withData"
                  render={({ field }) => (
                    <FormItemLayout
                      label={
                        <>
                          <Label className="mr-2">Include data</Label>
                          {!hasPitrEnabled && <Badge variant="warning">Requires PITR</Badge>}
                        </>
                      }
                      layout="flex-row-reverse"
                      className="[&>div>label]:mb-1"
                      description="Clone production data into this branch"
                    >
                      <FormControl>
                        <Switch
                          disabled={!hasPitrEnabled}
                          checked={field.value}
                          onCheckedChange={field.onChange}
                        />
                      </FormControl>
                    </FormItemLayout>
                  )}
                />
              )}
            </DialogSection>

            <DialogSectionSeparator />

            <DialogSection
              padding="medium"
              className={cn(
                'flex flex-col gap-4',
                promptPlanUpgrade && 'opacity-25 pointer-events-none'
              )}
            >
              {withData && (
                <div className="flex flex-row gap-4">
                  <div>
                    <figure className="w-10 h-10 rounded-md bg-info-200 border border-info-400 flex items-center justify-center">
                      <DatabaseZap className="text-info" size={20} strokeWidth={2} />
                    </figure>
                  </div>
                  <div className="flex flex-col gap-y-1">
                    {isLoadingDiskAttr ? (
                      <>
                        <ShimmeringLoader className="w-32 h-5 py-0" />
                        <ShimmeringLoader className="w-72 h-8 py-0" />
                      </>
                    ) : (
                      <>
                        {isErrorDiskAttr ? (
                          <>
                            <p className="text-sm text-foreground">
                              Branch disk size will incur additional cost per month
                            </p>
                            <p className="text-sm text-foreground-light">
                              The additional cost and time taken to create a data branch is relative
                              to the size of your database. We are unable to provide an estimate as
                              we were unable to retrieve your project's disk configuration
                            </p>
                          </>
                        ) : (
                          <>
                            <p className="text-sm text-foreground">
                              Branch disk size is billed at ${estimatedDiskCost.total.toFixed(2)}{' '}
                              per month
                            </p>
                            <p className="text-sm text-foreground-light">
                              Creating a data branch will take about{' '}
                              <span className="text-foreground">
                                {estimateRestoreTime(branchDiskAttributes).toFixed()} minutes
                              </span>{' '}
                              and costs{' '}
                              <span className="text-foreground">
                                ${estimatedDiskCost.total.toFixed(2)}
                              </span>{' '}
                              per month based on your current target database volume size of{' '}
                              {branchDiskAttributes.size_gb} GB and your{' '}
                              <Tooltip>
                                <TooltipTrigger>
                                  <span className={InlineLinkClassName}>
                                    project's disk configuration
                                  </span>
                                </TooltipTrigger>
                                <TooltipContent side="bottom">
                                  <div className="flex items-center gap-x-2">
                                    <p className="w-24">Disk type:</p>
                                    <p className="w-16">
                                      {branchDiskAttributes.type.toUpperCase()}
                                    </p>
                                  </div>
                                  <div className="flex items-center gap-x-2">
                                    <p className="w-24">Target disk size:</p>
                                    <p className="w-16">{branchDiskAttributes.size_gb} GB</p>
                                    <p>(${estimatedDiskCost.size.toFixed(2)})</p>
                                  </div>
                                  <div className="flex items-center gap-x-2">
                                    <p className="w-24">IOPs:</p>
                                    <p className="w-16">{branchDiskAttributes.iops} IOPS</p>
                                    <p>(${estimatedDiskCost.iops.toFixed(2)})</p>
                                  </div>
                                  {'throughput_mbps' in branchDiskAttributes && (
                                    <div className="flex items-center gap-x-2">
                                      <p className="w-24">Throughput:</p>
                                      <p className="w-16">
                                        {branchDiskAttributes.throughput_mbps} MB/s
                                      </p>
                                      <p>(${estimatedDiskCost.throughput.toFixed(2)})</p>
                                    </div>
                                  )}
                                  <p className="mt-2">
                                    More info in{' '}
                                    <InlineLink
                                      onClick={() => setShowCreateBranchModal(false)}
                                      className="pointer-events-auto"
                                      href={`/project/${ref}/settings/compute-and-disk`}
                                    >
                                      Compute and Disk
                                    </InlineLink>
                                  </p>
                                </TooltipContent>
                              </Tooltip>
                              .
                            </p>
                          </>
                        )}
                      </>
                    )}
                  </div>
                </div>
              )}

              {githubConnection && (
                <div className="flex flex-row gap-4">
                  <div>
                    <figure className="w-10 h-10 rounded-md bg-info-200 border border-info-400 flex items-center justify-center">
                      <GitMerge className="text-info" size={20} strokeWidth={2} />
                    </figure>
                  </div>
                  <div className="flex flex-col gap-y-1">
                    <p className="text-sm text-foreground">
                      {prodBranch?.git_branch
                        ? 'Merging to production enabled'
                        : 'Merging to production disabled'}
                    </p>
                    <p className="text-sm text-foreground-light">
                      {prodBranch?.git_branch ? (
                        <>
                          When this branch is merged to{' '}
                          <span className="text-foreground">{prodBranch.git_branch}</span>,
                          migrations will be deployed to production. Otherwise, migrations only run
                          on preview branches.
                        </>
                      ) : (
                        <>
                          Merging this branch to production will not deploy migrations. To enable
                          production deployment, enable "Deploy to production" in project
                          integration settings.
                        </>
                      )}
                    </p>
                  </div>
                </div>
              )}

              <div className="flex flex-row gap-4">
                <div>
                  <figure className="w-10 h-10 rounded-md bg-info-200 border border-info-400 flex items-center justify-center">
                    <DollarSign className="text-info" size={20} strokeWidth={2} />
                  </figure>
                </div>
                <div className="flex flex-col gap-y-1">
                  <p className="text-sm text-foreground">
                    Branch compute is billed at $
                    {withData ? branchComputeSize.priceHourly : instanceSizeSpecs.micro.priceHourly}{' '}
                    per hour
                  </p>
                  <p className="text-sm text-foreground-light">
                    {withData ? (
                      <>
                        <code className="text-code-inline">{branchComputeSize.label}</code> compute
                        size is automatically selected to match your production branch. You may
                        downgrade after creation or pause the branch when not in use to save cost.
                      </>
                    ) : (
                      <>This cost will continue for as long as the branch has not been removed.</>
                    )}
                  </p>
                </div>
              </div>

              {!hasPitrEnabled && <BranchingPITRNotice />}
              <TaxDisclaimer />
            </DialogSection>

            <DialogFooter className="justify-end gap-2" padding="medium">
              <Button
                type="default"
                disabled={isCreatingBranch}
                onClick={() => setShowCreateBranchModal(false)}
              >
                Cancel
              </Button>
              <ButtonTooltip
                form={formId}
                disabled={isDisabled}
                loading={isCreatingBranch}
                type={promptPlanUpgrade ? 'default' : 'primary'}
                htmlType="submit"
                tooltip={{
                  content: {
                    side: 'bottom',
                    text: tooltipText,
                  },
                }}
              >
                Create branch
              </ButtonTooltip>
            </DialogFooter>
          </form>
        </Form>
      </DialogContent>
    </Dialog>
  )
}