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

/**
 * Fields common to tzkt account types that own a manager key (`user` and `delegate`):
 * these types carry manager-key metadata — an on-chain reveal state (`revealed`), a counter,
 * a balance, and (un)staked balances, plus the public key once it has been revealed.
 * `publicKey` is optional: an unrevealed account (`revealed: false`) has not published one yet.
 * See https://api.tzkt.io/#operation/Accounts_GetByAddress (schemas `User` / `Delegate`).
 */
type APIManagerAccountBase = {
  address: string
  /** Absent until the account is revealed (`revealed: false` → no public key on-chain yet). */
  publicKey?: string
  revealed: boolean
  balance: number
  stakedBalance?: number
  unstakedBalance?: number
  stakingUpdatesCount?: number
  counter: number
  /**
   * The baker this account delegates to, if any. Present on plain wallets that have set a
   * delegate. We do not rely on it for registered bakers: a `delegate` account is its own
   * baker (self-delegated), and staking logic keys off `type === "delegate"` rather than this
   * field, so it's fine whether or not tzkt populates it.
   */
  delegate?: {
    alias: string
    address: string
    active: boolean
  }
}

/**
 * tzkt's `/v1/accounts/{address}` returns a discriminated union on `type` with seven
 * variants: `user`, `delegate`, `contract`, `ghost`, `empty`, `rollup`, `smart_rollup`.
 * We model only the ones we consume: `empty` (never appeared on-chain) plus the two
 * manager-key variants, `user` (plain wallet) and `delegate` (registered baker). A baker
 * is reported as `type: "delegate"`, NOT `"user"` — so any manager-key logic must accept
 * both (see {@link hasManagerKey}).
 */
export type APIAccount =
  | {
      type: 'empty'
      address: string
      counter: number
    }
  | (APIManagerAccountBase & {
      type: 'user'
      delegationLevel: number
      delegationTime: string
      numTransactions: number
      firstActivityTime: string
    })
  | (APIManagerAccountBase & {
      // A registered baker. tzkt reports these with `type: "delegate"` (not `"user"`),
      // still carrying `revealed`/`publicKey`/`counter`. In practice a delegate is revealed
      // (registration is a manager operation, which requires a prior reveal), but we still
      // read `revealed` from the payload rather than assuming it.
      type: 'delegate'
    })

/** tzkt account variants that own a manager key — both `user` and `delegate` qualify. */
export type APIManagerAccount = Extract<APIAccount, { type: 'user' | 'delegate' }>

/**
 * True for account *types* that own a manager key and therefore carry the `revealed`,
 * `publicKey`, `counter`, and `balance` fields: plain wallets (`user`) and registered bakers
 * (`delegate`). This narrows on the account type, not on whether the key is already published —
 * it returns true for unrevealed `user` accounts too (check `revealed` separately for that).
 * `empty` accounts (and the non-manager `contract` / `ghost` / `rollup` types we don't model)
 * do not qualify. Use this instead of a bare `type === "user"` check so baker accounts aren't
 * mistaken for non-manager ones.
 */
export function hasManagerKey(account: APIAccount): account is APIManagerAccount {
  return account.type === 'user' || account.type === 'delegate'
}

type CommonOperationType = {
  id: number
  hash?: string
  storageFee?: number
  allocationFee?: number
  bakerFee?: number
  timestamp: string
  level: number
  block: string
  gasLimit?: number
  storageLimit?: number
  status?: 'applied' | 'failed' | 'backtracked' | 'skipped'
}

/**
 * Source: https://api.tzkt.io/#operation/Accounts_GetOperations
 */
export type APITransactionType = CommonOperationType & {
  type: 'transaction'
  amount: number
  initiator: { address: string } | undefined | null
  sender: { address: string } | undefined | null
  target: { address: string } | undefined | null
  counter: number
}

export function isAPITransactionType(op: APIOperation): op is APITransactionType {
  return op.type === 'transaction'
}

export type APIDelegationType = CommonOperationType & {
  type: 'delegation'
  amount: number
  sender: { address: string } | undefined | null
  counter: number
  prevDelegate: { address: string } | undefined | null
  newDelegate: { address: string } | undefined | null
}
export function isAPIDelegationType(op: APIOperation): op is APIDelegationType {
  return op.type === 'delegation'
}

export type APIRevealType = CommonOperationType & {
  type: 'reveal'
  sender: { address: string } | undefined | null
  counter: number
}
export function isAPIRevealType(op: APIOperation): op is APIRevealType {
  return op.type === 'reveal'
}

export type APIStakingType = Omit<CommonOperationType, 'block'> & {
  type: 'staking'
  action: 'stake' | 'unstake' | 'finalize'
  /** Present on succeeded ops; failed ops omit `amount` and only carry `requestedAmount`. */
  amount?: number
  requestedAmount?: number
  counter: number
  sender: { address: string } | undefined | null
  staker?: { address: string } | undefined | null
  baker?: { address: string; alias?: string } | undefined | null
  stakingUpdatesCount?: number
  /**
   * `/accounts/{addr}/operations` returns the full block object inline
   * (with `.hash` and other fields); `/operations/staking` returns the
   * hash as a plain string. Consumers must narrow before reading `.hash`.
   */
  block?: string | APIBlock
}
export function isAPIStakingType(op: APIOperation): op is APIStakingType {
  return op.type === 'staking'
}

export type APIOriginationType = CommonOperationType & {
  type: 'origination'
  sender: { address: string } | undefined | null
  counter: number
  contractBalance: number
  originatedContract?: {
    address: string
  }
}
export function isAPIOriginationType(op: APIOperation): op is APIOriginationType {
  return op.type === 'origination'
}

// https://api.tzkt.io/#operation/Accounts_GetOperations
export type AccountsGetOperationsOptions = {
  lastId?: number // used as a pagination cursor to fetch more transactions
  limit?: number
  sort?: 'Descending' | 'Ascending'
  // the minimum height of the block the operation is in
  'level.ge': number
  /** Exclusive upper bound on block level (pagination window). */
  'level.lt'?: number
  /** Exclusive lower bound on block level (pagination window). */
  'level.gt'?: number
}

export type APIOperation =
  | APITransactionType
  | APIRevealType
  | APIDelegationType
  | (CommonOperationType & {
      type: 'activation'
      balance: number
    })
  | APIOriginationType
  | (CommonOperationType & {
      type: 'migration'
      balanceChange: number
    })
  | APIStakingType
  | (CommonOperationType & {
      type: '' // this is to express fact we have others and we need to always filter out others
    })

/**
 * Unstake request as returned by https://api.tzkt.io/#operation/Staking_GetUnstakeRequests.
 * `firstTime`: ISO timestamp the request was opened; the 4-day unlock window starts here.
 */
export type APIUnstakeRequest = {
  id: number
  cycle: number
  baker: { address: string; alias?: string }
  staker: { address: string }
  firstTime: string
  status: 'pending' | 'finalizable' | 'finalized'
  /** Net amount actually returnable (mutez), accounting for slashing/rounding. */
  actualAmount: number
  requestedAmount?: number
}

export type APIBlock = {
  cycle: number
  level: number
  hash: string
  timestamp: string
  proto: number
  payloadRound: number
  blockRound: number
  validations: number
  deposit: number
  rewardDelegated: number
  rewardStakedOwn: number
  rewardStakedEdge: number
  rewardStakedShared: number
  bonusDelegated: number
  bonusStakedOwn: number
  bonusStakedEdge: number
  bonusStakedShared: number
  fees: number
  nonceRevealed: boolean
  proposer: {
    address: string
  }
  producer: {
    address: string
  }
  software: {
    date: string
  }
  lbToggle: boolean
  lbToggleEma: number
  aiToggleEma: number
  rewardLiquid: number
  bonusLiquid: number
  reward: number
  bonus: number
  priority: number
  baker: {
    address: string
  }
  lbEscapeVote: boolean
  lbEscapeEma: number
  /** Hash of the previous block. Not included by default; request via TzKT `select` param if needed. */
  prevHash?: string
}

export type TokenTransfersGetOptions = {
  limit?: number
  sort?: 'Descending' | 'Ascending'
  'level.ge'?: number
  'level.lt'?: number
  'level.gt'?: number
  /** Exclusive upper bound on transfer id (TzKT `id.lt`). Used for intra-level pagination when sort is Descending. */
  'id.lt'?: number
  /** Exclusive lower bound on transfer id (TzKT `id.gt`). Used for intra-level pagination when sort is Ascending. */
  'id.gt'?: number
}

/**
 * A FA1.2 / FA2 token transfer event returned by `GET /v1/tokens/transfers`.
 * https://api.tzkt.io/#operation/Tokens_GetTokenTransfers
 */
export type APITokenTransfer = {
  /** Unique transfer identifier (monotonically increasing, usable as cursor). */
  id: number
  level: number
  timestamp: string
  token: {
    id: number
    contract: { address: string }
    /** Stringified token ID (FA2 only; "0" for FA1.2). */
    tokenId: string
    standard: 'fa1.2' | 'fa2'
    metadata?: {
      name?: string
      symbol?: string
      decimals?: string
    }
  }
  /** Sender address. Null/undefined for minting events. */
  from: { address: string } | undefined | null
  /** Receiver address. Null/undefined for burning events. */
  to: { address: string } | undefined | null
  /** Transfer amount as a decimal string (integer, no magnitude applied). */
  amount: string
  /**
   * The `id` of the `APITransactionType` operation that triggered this transfer.
   * Use this to join token transfers back to their parent on-chain operation hash.
   * Undefined for implicit/protocol-level transfers.
   */
  transactionId?: number
  originationId?: number
}

/**
 * A FA1.2 / FA2 token balance event returned by `GET /v1/tokens/balances`.
 * https://api.tzkt.io/#operation/Tokens_GetTokenBalances
 */
export type APITokenBalance = {
  id: number
  account: {
    address: string
  }
  token: {
    id: number
    contract: { address: string; alias?: string }
    tokenId: string
    standard: 'fa1.2' | 'fa2'
    metadata?: {
      name?: string
      symbol: string
      decimals: string
    }
  }
  balance: string
  transfersCount: number
  firstLevel: number
  firstTime: string
  lastLevel: number
  lastTime: string
}