import {
  businessAppError,
  type RequestBusinessBinding,
  requestBusinessBinding,
  toBusinessError,
} from "@conusai-kit/business"
import type { Container, ProcedureKind } from "@conusai-kit/core"
import {
  type Account,
  type Balance,
  type Entry,
  ledgerCreateAccount,
  ledgerGetAccount,
  ledgerGetBalances,
  ledgerGetTransaction,
  ledgerListAccounts,
  ledgerListEntries,
  ledgerListTransactions,
  ledgerPostTransaction,
  ledgerRecordTransaction,
  ledgerReverseTransaction,
  ledgerUpdateAccount,
  ledgerVerify,
  ledgerVoidTransaction,
  type Transaction,
} from "@conusai-sdk/ledger"
import { createClient } from "@conusai-sdk/ledger/client"
import { accountView, balanceView, entryView, transactionView, verificationView } from "../contract/index.js"
import { LEDGER_SERVICE, type LedgerReads, type LedgerService, type Page, readsOf } from "../core/ports.js"

async function answer<T>(
  operation: Promise<{ data?: T; error?: unknown; response?: Response }>,
): Promise<Exclude<T, undefined>> {
  let result: Awaited<typeof operation>
  try {
    result = await operation
  } catch (error) {
    throw businessAppError(toBusinessError(error, undefined))
  }
  if (result.error !== undefined || result.data === undefined)
    throw businessAppError(toBusinessError(result.error, result.response))
  return result.data as Exclude<T, undefined>
}
const account = (row: Account) =>
  accountView.parse({
    accountId: row.id,
    code: row.code,
    name: row.name,
    currency: row.currency,
    type: row.type,
    normalBalance: row.normal_balance,
    allowNegative: row.allow_negative,
    status: row.status,
    revision: row.revision.toString(),
  })
const balance = (row: Balance) =>
  balanceView.parse({
    accountId: row.account_id,
    currency: row.currency,
    posted: row.posted.toString(),
    pending: row.pending.toString(),
    available: row.available.toString(),
  })
const entry = (row: Entry) =>
  entryView.parse({
    entryId: row.id,
    transactionId: row.transaction_id,
    accountId: row.account_id,
    currency: row.currency,
    direction: row.direction,
    amountMinor: row.amount_minor.toString(),
  })
const transaction = (row: Transaction) =>
  transactionView.parse({
    transactionId: row.id,
    revision: row.revision.toString(),
    effectiveAt: row.effective_at,
    description: row.description,
    reference: row.reference ?? null,
    reverses: row.reverses ?? null,
    status: row.status,
    entries: row.entries.map(entry),
  })
const page = <A, B>(result: { data: A[]; next_after?: string | null }, view: (row: A) => B): Page<B> => ({
  rows: result.data.map(view),
  ...(result.next_after ? { after: result.next_after } : {}),
})
const query = (after?: string) => ({ limit: 50, ...(after ? { after } : {}) })
export function sdkLedgerService(binding: RequestBusinessBinding): LedgerService {
  const client = binding.client(createClient)
  const org = { org_slug: binding.orgSlug }
  return {
    async accounts(after) {
      return page(await answer(ledgerListAccounts({ client, path: org, query: query(after) })), account)
    },
    async account(id) {
      return account(await answer(ledgerGetAccount({ client, path: { ...org, account_id: id } })))
    },
    async balances(id, after) {
      return page(
        await answer(
          ledgerGetBalances({ client, path: org, query: { ...query(after), ...(id ? { account_id: id } : {}) } }),
        ),
        balance,
      )
    },
    async entries(id, after) {
      return page(
        await answer(ledgerListEntries({ client, path: { ...org, account_id: id }, query: query(after) })),
        entry,
      )
    },
    async transactions(after) {
      return page(await answer(ledgerListTransactions({ client, path: org, query: query(after) })), transaction)
    },
    async transaction(id) {
      return transaction(await answer(ledgerGetTransaction({ client, path: { ...org, transaction_id: id } })))
    },
    async verify() {
      const result = await answer(ledgerVerify({ client, path: org }))
      return verificationView.parse({ checkedAccounts: result.checked_accounts, drift: result.drift })
    },
    async createAccount(input, key) {
      return account(
        await answer(
          ledgerCreateAccount({
            client,
            path: org,
            body: {
              code: input.code,
              name: input.name,
              currency: input.currency,
              type: input.type,
              normal_balance: input.normalBalance,
              allow_negative: input.allowNegative,
              idempotency_key: key,
            },
          }),
        ),
      )
    },
    async updateAccount(id, input, revision, key) {
      return account(
        await answer(
          ledgerUpdateAccount({
            client,
            path: { ...org, account_id: id },
            body: {
              name: input.name,
              status: input.status,
              allow_negative: input.allowNegative,
              revision: BigInt(revision),
              idempotency_key: key,
            },
          }),
        ),
      )
    },
    async record(terms, key) {
      return transaction(
        await answer(
          ledgerRecordTransaction({
            client,
            path: org,
            body: {
              effective_at: terms.effectiveAt,
              description: terms.description,
              reference: terms.reference ?? null,
              status: terms.status,
              entries: terms.entries.map((row) => ({
                account_id: row.accountId,
                direction: row.direction,
                amount_minor: BigInt(row.amountMinor),
              })),
              idempotency_key: key,
            },
          }),
        ),
      )
    },
    async transition(action, id, revision, key) {
      const method =
        action === "post" ? ledgerPostTransaction : action === "void" ? ledgerVoidTransaction : ledgerReverseTransaction
      return transaction(
        await answer(
          method({
            client,
            path: { ...org, transaction_id: id },
            body: { revision: BigInt(revision), idempotency_key: key },
          }),
        ),
      )
    },
  }
}
export function ledgerServiceOf(container: Container, kind: "effect"): LedgerService
export function ledgerServiceOf(container: Container, kind: ProcedureKind): LedgerReads
export function ledgerServiceOf(container: Container, kind: ProcedureKind): LedgerReads {
  const service = container.has(LEDGER_SERVICE)
    ? container.resolve(LEDGER_SERVICE)
    : sdkLedgerService(requestBusinessBinding(container))
  return kind === "effect" ? service : readsOf(service)
}