// SPDX-FileCopyrightText: © 2026 LEDGER SAS
// SPDX-License-Identifier: Apache-2.0

import type { TezosCoinConfig, TezosContext } from '../config'
import type { APIAccount, APIManagerAccount, APIUnstakeRequest } from '../network/types'
import type { Cursor, Page, Stake } from '@ledgerhq/coin-module-framework/api/types'
import { log } from '@ledgerhq/logs'
import { hasManagerKey } from '../network/types'
import { createTzktApi } from '../network/tzkt'
import { partitionNativeBalance } from '../utils'
import { STAKING_UID_PREFIX } from './positionUid'

export {
  isDelegationPosition,
  isFinalizablePosition,
  isStakePosition,
  isUnstakingPosition,
} from './positionUid'

export function fetchUnstakeRequests(
  config: TezosCoinConfig,
  address: string,
  account: APIAccount
): Promise<APIUnstakeRequest[]> {
  if (!hasManagerKey(account)) return Promise.resolve([])
  return (account.unstakedBalance ?? 0) > 0
    ? createTzktApi(config).getUnstakeRequests(address)
    : Promise.resolve([])
}

function unstakeRequestToStake(address: string, req: APIUnstakeRequest): Stake | null {
  // TzKT's status filter is unreliable; never build a position for a finalized request.
  if (req.status !== 'pending' && req.status !== 'finalizable') {
    log('coin:tezos', 'unstakeRequestToStake: dropping non-active unstake request', {
      requestId: req.id,
      status: req.status,
    })
    return null
  }
  if (req.actualAmount <= 0) {
    log('coin:tezos', 'unstakeRequestToStake: dropping non-positive unstake request', {
      requestId: req.id,
      actualAmount: req.actualAmount,
    })
    return null
  }
  const createdAt = new Date(req.firstTime)
  if (!Number.isFinite(createdAt.getTime())) {
    log('coin:tezos', 'unstakeRequestToStake: dropping unstake request with invalid firstTime', {
      requestId: req.id,
      firstTime: req.firstTime,
    })
    return null
  }
  const isFinalizable = req.status === 'finalizable'
  const prefix = isFinalizable ? STAKING_UID_PREFIX.finalizable : STAKING_UID_PREFIX.unstaking
  return {
    uid: `${prefix}${req.id}`,
    address,
    ...(req.baker?.address && { delegate: req.baker.address }),
    state: isFinalizable ? 'inactive' : 'deactivating',
    createdAt,
    asset: { type: 'native' },
    amount: BigInt(req.actualAmount),
    actions: [],
  }
}

export function buildStakesForAccount(
  address: string,
  account: APIManagerAccount,
  unstakeRequests: APIUnstakeRequest[]
): Stake[] {
  const balance = BigInt(account.balance ?? 0)
  const stakedBalance = BigInt(account.stakedBalance ?? 0)
  // Account-level unstaked total (the source validateIntent's gate uses), not the summed per-request
  // positions below — so spendable stays gate-consistent even if a request is dropped or its fetch fails.
  const unstakedBalance = BigInt(account.unstakedBalance ?? 0)
  const delegateAddress = account.delegate?.address

  const unstakeStakes: Stake[] = []
  for (const req of unstakeRequests) {
    const stake = unstakeRequestToStake(address, req)
    if (stake) unstakeStakes.push(stake)
  }

  const stakes: Stake[] = []

  if (delegateAddress) {
    const { spendable: delegated, locked } = partitionNativeBalance(
      balance,
      stakedBalance,
      unstakedBalance
    )
    if (locked < stakedBalance + unstakedBalance) {
      log('coin:tezos', 'buildStakesForAccount: balance < staked + unstaked, clamping to 0', {
        address,
        balance: balance.toString(),
        stakedBalance: stakedBalance.toString(),
        unstakedBalance: unstakedBalance.toString(),
      })
    }
    stakes.push({
      uid: `${STAKING_UID_PREFIX.delegation}${address}`,
      address,
      delegate: delegateAddress,
      state: 'active',
      asset: { type: 'native' },
      amount: delegated,
      actions: [],
    })
  }

  if (stakedBalance > 0n) {
    stakes.push({
      uid: `${STAKING_UID_PREFIX.stake}${address}`,
      address,
      ...(delegateAddress && { delegate: delegateAddress }),
      state: 'active',
      asset: { type: 'native' },
      amount: stakedBalance,
      actions: [],
    })
  }

  stakes.push(...unstakeStakes)

  return stakes
}

export async function getStakes(
  context: TezosContext,
  address: string,
  _cursor?: Cursor
): Promise<Page<Stake>> {
  const config = await context.config()
  const accountInfo = await createTzktApi(config).getAccountByAddress(address)
  if (!hasManagerKey(accountInfo)) return { items: [] }
  const unstakeRequests = await fetchUnstakeRequests(config, address, accountInfo)
  return { items: buildStakesForAccount(address, accountInfo, unstakeRequests) }
}