import * as React from 'react'
import { useCallback, useEffect, useState } from 'react'
import type { CommandResultDisplay } from '../../commands.js'
import { TEARDROP_ASTERISK } from '../../constants/figures.js'
import { useExitOnCtrlCDWithKeybindings } from '../../hooks/useExitOnCtrlCDWithKeybindings.js'
import { setClipboard } from '@anthropic/ink'
// eslint-disable-next-line custom-rules/prefer-use-keybindings -- enter to copy link
import { Box, Link, Text, useInput } from '@anthropic/ink'
import { useKeybinding } from '../../keybindings/useKeybinding.js'
import { logEvent } from '../../services/analytics/index.js'
import {
  fetchReferralRedemptions,
  formatCreditAmount,
  getCachedOrFetchPassesEligibility,
} from '../../services/api/referral.js'
import type {
  ReferralRedemptionsResponse,
  ReferrerRewardInfo,
} from '../../services/oauth/types.js'
import { count } from '../../utils/array.js'
import { logError } from '../../utils/log.js'
import { Pane } from '@anthropic/ink'

type PassStatus = {
  passNumber: number
  isAvailable: boolean
}

type Props = {
  onDone: (
    result?: string,
    options?: { display?: CommandResultDisplay },
  ) => void
}

export function Passes({ onDone }: Props): React.ReactNode {
  const [loading, setLoading] = useState(true)
  const [passStatuses, setPassStatuses] = useState<PassStatus[]>([])
  const [isAvailable, setIsAvailable] = useState(false)
  const [referralLink, setReferralLink] = useState<string | null>(null)
  const [referrerReward, setReferrerReward] = useState<
    ReferrerRewardInfo | null | undefined
  >(undefined)

  const exitState = useExitOnCtrlCDWithKeybindings(() =>
    onDone('Guest passes dialog dismissed', { display: 'system' }),
  )

  const handleCancel = useCallback(() => {
    onDone('Guest passes dialog dismissed', { display: 'system' })
  }, [onDone])

  useKeybinding('confirm:no', handleCancel, { context: 'Confirmation' })

  useInput((_input, key) => {
    if (key.return && referralLink) {
      void setClipboard(referralLink).then(raw => {
        if (raw) process.stdout.write(raw)
        logEvent('tengu_guest_passes_link_copied', {})
        onDone(`Referral link copied to clipboard!`)
      })
    }
  })

  useEffect(() => {
    async function loadPassesData() {
      try {
        // Check eligibility first (uses cache if available)
        const eligibilityData = await getCachedOrFetchPassesEligibility()

        if (!eligibilityData || !eligibilityData.eligible) {
          setIsAvailable(false)
          setLoading(false)
          return
        }

        setIsAvailable(true)

        // Store the referral link if available
        if (eligibilityData.referral_code_details?.referral_link) {
          setReferralLink(eligibilityData.referral_code_details.referral_link)
        }

        // Store referrer reward info for v1 campaign messaging
        setReferrerReward(eligibilityData.referrer_reward)

        // Use the campaign returned from eligibility for redemptions
        const campaign =
          eligibilityData.referral_code_details?.campaign ??
          'claude_code_guest_pass'

        // Fetch redemptions data
        let redemptionsData: ReferralRedemptionsResponse
        try {
          redemptionsData = await fetchReferralRedemptions(campaign)
        } catch (err) {
          logError(err as Error)
          setIsAvailable(false)
          setLoading(false)
          return
        }

        // Build pass statuses array
        const redemptions = redemptionsData.redemptions || []
        const maxRedemptions = redemptionsData.limit || 3
        const statuses: PassStatus[] = []

        for (let i = 0; i < maxRedemptions; i++) {
          const redemption = redemptions[i]
          statuses.push({
            passNumber: i + 1,
            isAvailable: !redemption,
          })
        }

        setPassStatuses(statuses)
        setLoading(false)
      } catch (err) {
        // For any error, just show passes as not available
        logError(err as Error)
        setIsAvailable(false)
        setLoading(false)
      }
    }

    void loadPassesData()
  }, [])

  if (loading) {
    return (
      <Pane>
        <Box flexDirection="column" gap={1}>
          <Text dimColor>Loading guest pass information…</Text>
          <Text dimColor italic>
            {exitState.pending ? (
              <>Press {exitState.keyName} again to exit</>
            ) : (
              <>Esc to cancel</>
            )}
          </Text>
        </Box>
      </Pane>
    )
  }

  if (!isAvailable) {
    return (
      <Pane>
        <Box flexDirection="column" gap={1}>
          <Text>Guest passes are not currently available.</Text>
          <Text dimColor italic>
            {exitState.pending ? (
              <>Press {exitState.keyName} again to exit</>
            ) : (
              <>Esc to cancel</>
            )}
          </Text>
        </Box>
      </Pane>
    )
  }

  const availableCount = count(passStatuses, p => p.isAvailable)

  // Sort passes: available first, then redeemed
  const sortedPasses = [...passStatuses].sort(
    (a, b) => +b.isAvailable - +a.isAvailable,
  )

  // ASCII art for tickets
  const renderTicket = (pass: PassStatus) => {
    const isRedeemed = !pass.isAvailable

    if (isRedeemed) {
      // Grayed out redeemed ticket with slashes
      return (
        <Box key={pass.passNumber} flexDirection="column" marginRight={1}>
          <Text dimColor>{'┌─────────╱'}</Text>
          <Text dimColor>{` ) CC ${TEARDROP_ASTERISK} ┊╱`}</Text>
          <Text dimColor>{'└───────╱'}</Text>
        </Box>
      )
    }

    return (
      <Box key={pass.passNumber} flexDirection="column" marginRight={1}>
        <Text>{'┌──────────┐'}</Text>
        <Text>
          {' ) CC '}
          <Text color="claude">{TEARDROP_ASTERISK}</Text>
          {' ┊ ( '}
        </Text>
        <Text>{'└──────────┘'}</Text>
      </Box>
    )
  }

  return (
    <Pane>
      <Box flexDirection="column" gap={1}>
        <Text color="permission">Guest passes · {availableCount} left</Text>

        <Box flexDirection="row" marginLeft={2}>
          {sortedPasses.slice(0, 3).map(pass => renderTicket(pass))}
        </Box>

        {referralLink && (
          <Box marginLeft={2}>
            <Text>{referralLink}</Text>
          </Box>
        )}

        <Box flexDirection="column" marginLeft={2}>
          <Text dimColor>
            {referrerReward
              ? `Share a free week of Claude Code with friends. If they love it and subscribe, you'll get ${formatCreditAmount(referrerReward)} of extra usage to keep building. `
              : 'Share a free week of Claude Code with friends. '}
            <Link
              url={
                referrerReward
                  ? 'https://support.claude.com/en/articles/13456702-claude-code-guest-passes'
                  : 'https://support.claude.com/en/articles/12875061-claude-code-guest-passes'
              }
            >
              Terms apply.
            </Link>
          </Text>
        </Box>

        <Box>
          <Text dimColor italic>
            {exitState.pending ? (
              <>Press {exitState.keyName} again to exit</>
            ) : (
              <>Enter to copy link · Esc to cancel</>
            )}
          </Text>
        </Box>
      </Box>
    </Pane>
  )
}