import React from 'react'
import { Table, TableBody, TableCell, TableFooter, TableRow } from 'ui'
import { InfoTooltip } from 'ui-patterns/info-tooltip'
import { ShimmeringLoader } from 'ui-patterns/ShimmeringLoader'

import { billingMetricUnit, formatUsage } from '../helpers'
import AlertError from '@/components/ui/AlertError'
import { InlineLink } from '@/components/ui/InlineLink'
import { PricingMetric } from '@/data/analytics/org-daily-stats-query'
import {
  UpcomingInvoiceResponse,
  useOrgUpcomingInvoiceQuery,
} from '@/data/invoices/org-invoice-upcoming-query'
import { useOrganizationQuery } from '@/data/organizations/organization-query'
import { DOCS_URL } from '@/lib/constants'
import { formatCurrency } from '@/lib/helpers'

export interface UpcomingInvoiceProps {
  slug?: string
}

const usageBillingDocsLink: { [K in PricingMetric]?: string } = {
  [PricingMetric.MONTHLY_ACTIVE_USERS]: `${DOCS_URL}/guides/platform/manage-your-usage/monthly-active-users`,
  [PricingMetric.MONTHLY_ACTIVE_SSO_USERS]: `${DOCS_URL}/guides/platform/manage-your-usage/monthly-active-users-sso`,
  [PricingMetric.MONTHLY_ACTIVE_THIRD_PARTY_USERS]: `${DOCS_URL}/guides/platform/manage-your-usage/monthly-active-users-third-party`,
  [PricingMetric.AUTH_MFA_PHONE]: `${DOCS_URL}/guides/platform/manage-your-usage/advanced-mfa-phone`,

  [PricingMetric.EGRESS]: `${DOCS_URL}/guides/platform/manage-your-usage/egress`,
  [PricingMetric.CACHED_EGRESS]: `${DOCS_URL}/guides/platform/manage-your-usage/egress`,

  [PricingMetric.FUNCTION_INVOCATIONS]: `${DOCS_URL}/guides/platform/manage-your-usage/edge-function-invocations`,

  [PricingMetric.STORAGE_SIZE]: `${DOCS_URL}/guides/platform/manage-your-usage/storage-size`,
  [PricingMetric.STORAGE_IMAGES_TRANSFORMED]: `${DOCS_URL}/guides/platform/manage-your-usage/storage-image-transformations`,

  [PricingMetric.REALTIME_MESSAGE_COUNT]: `${DOCS_URL}/guides/platform/manage-your-usage/realtime-messages`,
  [PricingMetric.REALTIME_PEAK_CONNECTIONS]: `${DOCS_URL}/guides/platform/manage-your-usage/realtime-peak-connections`,

  [PricingMetric.CUSTOM_DOMAIN]: `${DOCS_URL}/guides/platform/manage-your-usage/custom-domains`,
  [PricingMetric.IPV4]: `${DOCS_URL}/guides/platform/manage-your-usage/ipv4`,
  [PricingMetric.PITR_7]: `${DOCS_URL}/guides/platform/manage-your-usage/point-in-time-recovery`,
  [PricingMetric.PITR_14]: `${DOCS_URL}/guides/platform/manage-your-usage/point-in-time-recovery`,
  [PricingMetric.PITR_28]: `${DOCS_URL}/guides/platform/manage-your-usage/point-in-time-recovery`,
  [PricingMetric.DISK_SIZE_GB_HOURS_GP3]: `${DOCS_URL}/guides/platform/manage-your-usage/disk-size`,
  [PricingMetric.DISK_SIZE_GB_HOURS_IO2]: `${DOCS_URL}/guides/platform/manage-your-usage/disk-size`,
  [PricingMetric.DISK_IOPS_GP3]: `${DOCS_URL}/guides/platform/manage-your-usage/disk-iops`,
  [PricingMetric.DISK_IOPS_IO2]: `${DOCS_URL}/guides/platform/manage-your-usage/disk-iops`,
  [PricingMetric.DISK_THROUGHPUT_GP3]: `${DOCS_URL}/guides/platform/manage-your-usage/disk-throughput`,
  [PricingMetric.LOG_DRAIN]: `${DOCS_URL}/guides/platform/manage-your-usage/log-drains`,
}

export const UpcomingInvoice = ({ slug }: UpcomingInvoiceProps) => {
  const {
    data: upcomingInvoice,
    error: error,
    isPending: isLoading,
    isError,
    isSuccess,
  } = useOrgUpcomingInvoiceQuery({ orgSlug: slug })

  const { data: organization } = useOrganizationQuery({ slug })

  // For non-platform customers, compute is broken down per project and contains a breakdown array
  const computeItems =
    upcomingInvoice?.lines?.filter(
      (item) =>
        item.description?.toLowerCase().includes('compute') &&
        !item.description.startsWith('Compute Credits')
    ) || []

  const computeCreditsItem =
    upcomingInvoice?.lines?.find((item) => item.description.startsWith('Compute Credits')) ?? null

  const planItem = upcomingInvoice?.lines?.find((item) =>
    item.description?.toLowerCase().includes('plan')
  )

  const regularComputeItems = computeItems.filter(
    (it) => !it.metadata?.is_branch && !it.metadata?.is_read_replica
  )
  const branchingComputeItems = computeItems.filter((it) => it.metadata?.is_branch)
  const replicaComputeItems = computeItems.filter((it) => it.metadata?.is_read_replica)

  const branchingComputeItemsDisplay = branchingComputeItems
    .flatMap((it) => it.breakdown)
    .sort((a, b) => (a?.project_name ?? '').localeCompare(b?.project_name ?? ''))

  const otherItems =
    upcomingInvoice?.lines
      ?.filter(
        (item) =>
          !item.description?.toLowerCase().includes('compute') &&
          !item.description?.toLowerCase().includes('plan') &&
          item.amount_before_discount > 0
      )
      .sort((a, b) => b.amount_before_discount - a.amount_before_discount) || []

  const prepaidCreditsItem =
    upcomingInvoice?.lines?.find((item) => item.item_name === 'Prepaid Credits') ?? null

  const hasTax =
    upcomingInvoice?.tax_status === 'calculated' && (upcomingInvoice?.tax?.tax_amount ?? 0) > 0
  const taxFailed = upcomingInvoice?.tax_status === 'failed'

  const planFeePaidInAdvance =
    !planItem && upcomingInvoice?.fixed_fees_billing_mode === 'in_arrears'

  return (
    <>
      {isLoading && (
        <div className="space-y-2">
          <ShimmeringLoader />
          <ShimmeringLoader className="w-3/4" />
          <ShimmeringLoader className="w-1/2" />
        </div>
      )}

      {isError && <AlertError subject="Failed to retrieve upcoming invoice" error={error} />}

      {isSuccess && (
        <div>
          <div>
            <Table className="w-full text-sm">
              <TableBody>
                {planItem && !planFeePaidInAdvance && (
                  <TableRow>
                    <TableCell className="py-2! px-0">{planItem?.description}</TableCell>
                    <TableCell className="text-right py-2 px-0">
                      {!planItem ? (
                        '-'
                      ) : (
                        <InvoiceLineItemAmount
                          amount={planItem.amount}
                          amountBeforeDiscount={planItem.amount_before_discount}
                        />
                      )}
                    </TableCell>
                  </TableRow>
                )}

                {/* Compute section */}
                <ComputeLineItem
                  computeItems={regularComputeItems}
                  title="Compute"
                  computeCredits={computeCreditsItem}
                  tooltip={
                    <p className="prose text-xs">
                      The first project is covered by Compute Credits. Additional projects incur
                      compute costs starting at <span translate="no">$10</span>/month, independent
                      of activity. See{' '}
                      <InlineLink href={`${DOCS_URL}/guides/platform/manage-your-usage/compute`}>
                        docs
                      </InlineLink>
                      .
                    </p>
                  }
                />

                {/* Read Replica compute */}
                <ComputeLineItem
                  title="Replica Compute"
                  computeItems={replicaComputeItems}
                  tooltip={
                    <p className="prose text-xs">
                      Each Read Replica is a dedicated database. You are charged for its resources:
                      Compute, Disk Size, provisioned Disk IOPS, provisioned Disk Throughput, and
                      IPv4. See{' '}
                      <InlineLink
                        href={`${DOCS_URL}/guides/platform/manage-your-usage/read-replicas`}
                      >
                        docs
                      </InlineLink>
                      .
                    </p>
                  }
                />

                {/* Branching compute */}
                {branchingComputeItems.length > 0 && (
                  <TableRow>
                    <TableCell className="py-2 px-0">
                      <div className="flex items-center gap-1">
                        <span>Branching</span>
                        <InfoTooltip className="max-w-sm">
                          <ul className="ml-6 list-disc">
                            {branchingComputeItemsDisplay.map((breakdown) => (
                              <li key={`branching-breakdown-${breakdown!.project_ref}`}>
                                {breakdown!.project_name} ({breakdown!.usage} Hours)
                              </li>
                            ))}
                          </ul>

                          <p className="mt-2">
                            See{' '}
                            <InlineLink
                              href={`${DOCS_URL}/guides/platform/manage-your-usage/branching`}
                            >
                              docs
                            </InlineLink>{' '}
                            on how billing for Branching works.
                          </p>
                        </InfoTooltip>
                      </div>
                    </TableCell>
                    <TableCell className="text-right py-2 px-0">
                      <InvoiceLineItemAmount
                        amount={branchingComputeItems.reduce((prev, cur) => prev + cur.amount, 0)}
                        amountBeforeDiscount={branchingComputeItems.reduce(
                          (prev, cur) => prev + (cur.amount_before_discount ?? 0),
                          0
                        )}
                      />
                    </TableCell>
                  </TableRow>
                )}

                {/* Non-compute items */}
                {otherItems.map((item) => {
                  const usageMetric = item.usage_metric as PricingMetric
                  const sortedBreakdown = (item.breakdown ?? []).sort((a, b) =>
                    a.project_name.localeCompare(b.project_name)
                  )

                  return (
                    <TableRow key={item.description}>
                      <TableCell className="py-2 px-0">
                        <div className="gap-1 flex items-center">
                          <span>{item.description ?? 'Unknown'}</span>
                          {(sortedBreakdown.length > 0 || item.usage_metric !== null) && (
                            <InfoTooltip className="max-w-sm">
                              {item.item_name === 'minimum_amount' && (
                                <p className="mb-2" translate="no">
                                  Minimum Fee - If your cost is below the minimum fee, you will be
                                  charged the difference as a floor fee
                                </p>
                              )}

                              {item.unit_price_desc && (
                                <p className="mb-2" translate="no">
                                  Pricing: {item.unit_price_desc}
                                </p>
                              )}

                              {sortedBreakdown.length > 0 && (
                                <>
                                  <p>Projects using {item.description}:</p>
                                  <ul className="ml-6 list-disc">
                                    {sortedBreakdown.map((breakdown) => {
                                      const unit = billingMetricUnit(usageMetric)
                                      return (
                                        <li
                                          key={`${item.description}-breakdown-${breakdown.project_ref}`}
                                        >
                                          <InlineLink
                                            target="_blank"
                                            href={`/project/${breakdown.project_ref}`}
                                          >
                                            {breakdown.project_name}
                                          </InlineLink>{' '}
                                          {usageMetric && (
                                            <span>
                                              ({formatUsage(usageMetric, breakdown)}
                                              {!!unit ? ` ${unit}` : ''})
                                            </span>
                                          )}
                                        </li>
                                      )
                                    })}
                                  </ul>
                                </>
                              )}

                              {usageMetric && usageBillingDocsLink[usageMetric] != null && (
                                <p className="mt-2">
                                  See{' '}
                                  <InlineLink href={usageBillingDocsLink[usageMetric]!}>
                                    docs
                                  </InlineLink>{' '}
                                  on how billing for {item.description} works and{' '}
                                  <InlineLink href={`/organization/${slug}/usage`}>
                                    usage page
                                  </InlineLink>{' '}
                                  for a detailed breakdown.
                                </p>
                              )}
                            </InfoTooltip>
                          )}
                        </div>
                      </TableCell>
                      <TableCell className="text-right py-2 px-0">
                        <InvoiceLineItemAmount
                          amount={item.amount}
                          amountBeforeDiscount={item.amount_before_discount}
                        />
                      </TableCell>
                    </TableRow>
                  )
                })}
              </TableBody>

              <TableFooter>
                {prepaidCreditsItem && (
                  <TableRow>
                    <TableCell className="py-2 px-0 flex items-center">
                      <span className="mr-2">{prepaidCreditsItem.item_name}</span>
                      <InfoTooltip className="max-w-xs">
                        Prepaid credits purchased upfront, applied automatically against your
                        invoice. Any remaining balance rolls over to the next billing cycle.
                      </InfoTooltip>
                    </TableCell>
                    <TableCell className="text-right py-2 px-0" translate="no">
                      {formatCurrency(prepaidCreditsItem.amount) ?? '-'}
                    </TableCell>
                  </TableRow>
                )}
                <TableRow>
                  <TableCell className="font-medium py-2 px-0 flex items-center">
                    <span className="mr-2">Current Costs</span>
                    <InfoTooltip>
                      Costs accumulated from the beginning of the billing cycle up to now.
                    </InfoTooltip>
                  </TableCell>
                  <TableCell className="text-right font-medium py-2 px-0" translate="no">
                    {formatCurrency(upcomingInvoice?.amount_total) ?? '-'}
                  </TableCell>
                </TableRow>

                {(!!upcomingInvoice.amount_projected || hasTax || taxFailed) && (
                  <TableRow>
                    <TableCell className="font-medium py-2 px-0 flex items-center">
                      <span className="mr-2">Projected Costs</span>
                      <InfoTooltip className="max-w-sm">
                        <p className="mb-2">
                          Projected costs at the end of the billing cycle. Includes predictable
                          costs for Compute Hours, IPv4, Custom Domain and Point-In-Time-Recovery,
                          but no costs for metrics like MAU, storage or function invocations. Final
                          amounts may vary depending on your usage.
                        </p>

                        {hasTax && (
                          <div className="mt-3 border-t border-muted pt-2 space-y-1">
                            <div className="flex items-center justify-between gap-4 text-xs">
                              <span>Subtotal</span>
                              <span translate="no">
                                {formatCurrency(upcomingInvoice.tax!.total_amount_excluding_tax)}
                              </span>
                            </div>
                            <div className="flex items-center justify-between gap-4 text-xs">
                              <span>
                                Tax
                                {upcomingInvoice.tax?.tax_rate_percentage != null &&
                                  ` (${upcomingInvoice.tax.tax_rate_percentage}%)`}
                              </span>
                              <span translate="no">
                                {formatCurrency(upcomingInvoice.tax!.tax_amount)}
                              </span>
                            </div>
                            <p className="text-foreground-lighter pt-1 text-xs">
                              Estimated based on your organization's billing address. The final
                              amount may be adjusted at the end of the billing cycle.
                            </p>
                          </div>
                        )}

                        {taxFailed && (
                          <p className="mt-3 border-t border-muted pt-2 text-warning">
                            We were unable to estimate tax for your organization. Please verify your
                            billing address in your organization settings.
                          </p>
                        )}
                      </InfoTooltip>
                    </TableCell>
                    <TableCell className="text-right font-medium py-2 px-0" translate="no">
                      {formatCurrency(
                        hasTax
                          ? upcomingInvoice.tax!.total_amount_including_tax
                          : upcomingInvoice.amount_projected
                      ) ?? '-'}
                    </TableCell>
                  </TableRow>
                )}

                {planFeePaidInAdvance && (
                  <TableRow className="border-0 hover:bg-transparent">
                    <TableCell
                      className="pt-2! pb-0! px-0 text-foreground-light text-xs text-right"
                      colSpan={2}
                    >
                      Your {organization?.plan?.name && `${organization.plan.name} `}Plan fee for
                      this period has already been paid. This invoice will only reflect usage
                      charges.
                    </TableCell>
                  </TableRow>
                )}
              </TableFooter>
            </Table>
          </div>
        </div>
      )}
    </>
  )
}

function InvoiceLineItemAmount({
  amountBeforeDiscount,
  amount,
}: {
  amountBeforeDiscount?: number
  amount: number
}) {
  if (amountBeforeDiscount && amount < amountBeforeDiscount) {
    return (
      <div>
        <span className="text-foreground-light line-through mr-2" translate="no">
          {formatCurrency(amountBeforeDiscount)}
        </span>
        <span translate="no">{formatCurrency(amount)}</span>
      </div>
    )
  } else {
    return <span translate="no">{formatCurrency(amount)}</span>
  }
}

function ComputeLineItem({
  computeItems,
  tooltip,
  title,
  computeCredits,
}: {
  title: string
  tooltip: React.ReactElement
  computeItems: UpcomingInvoiceResponse['lines']
  computeCredits?: UpcomingInvoiceResponse['lines'][number] | null
}) {
  const computeProjects = computeItems
    .flatMap((item) =>
      item.breakdown!.map((project) => ({
        ...project,
        computeType: item.description,
        computeCosts: project.amount!,
      }))
    )
    // descending by cost
    .sort((a, b) => b.computeCosts - a.computeCosts)

  const computeItemsSortedByCost = computeItems
    // descending by cost
    .sort((a, b) => b.amount - a.amount)

  const computeCosts = Math.max(
    0,
    computeItems.reduce((prev, cur) => prev + cur.amount_before_discount, 0)
  )

  const discountedComputeCosts = Math.max(
    0,
    computeItems.reduce((prev, cur) => prev + (cur.amount ?? 0), 0)
  )

  if (!computeItems.length) return null

  return (
    <>
      <TableRow>
        <TableCell className="py-2! px-0 flex items-center gap-1">
          <span>{title}</span>
          <InfoTooltip className="max-w-sm">{tooltip}</InfoTooltip>
        </TableCell>
        <TableCell className="text-right py-2 px-0">
          <InvoiceLineItemAmount
            amount={discountedComputeCosts}
            amountBeforeDiscount={computeCosts}
          />
        </TableCell>
      </TableRow>
      {computeProjects.map((project) => (
        <TableRow key={project.project_ref} className="text-foreground-light text-xs">
          <TableCell className="py-2! px-0 pl-6">
            {project.project_name} ({project.computeType} - {project.usage} Hours)
          </TableCell>

          <TableCell className="py-2! px-0 text-right" translate="no">
            {formatCurrency(project.computeCosts)}
          </TableCell>
        </TableRow>
      ))}

      {/* Fallback to breakdown by instance size if project breakdown not available  */}
      {!computeProjects.length &&
        computeItemsSortedByCost.map((computeItem) => (
          <TableRow
            key={title + computeItem.usage_metric}
            className="text-foreground-light text-xs"
          >
            <TableCell className="py-2! px-0 pl-6">
              {computeItem.description} - {computeItem.usage_original} Hours
            </TableCell>

            <TableCell className="py-2! px-0 text-right" translate="no">
              {formatCurrency(computeItem.amount)}
            </TableCell>
          </TableRow>
        ))}

      {computeCredits && (
        <TableRow className="text-foreground-light text-xs">
          <TableCell className="py-2! px-0 pl-6">Compute Credits</TableCell>
          <TableCell className="py-2! px-0 text-right" translate="no">
            {formatCurrency(computeCredits.amount)}
          </TableCell>
        </TableRow>
      )}
    </>
  )
}