import type { Difficulty } from './data/accounts'

/** 仕訳1行 */
export interface Entry {
  account: string
  amount: number
}

/** 記号と勘定科目のペア（語群） */
export interface SymbolChoice {
  symbol: string  // 'ア', 'イ', 'ウ' ...
  account: string
}

/** 証憑・資料（納品書・請求書等）の構造化データ */
export interface ProblemDocument {
  type: 'table'
  title?: string
  headers: string[]
  rows: string[][]
}

/** 生成・保管される問題 */
export interface Problem {
  id: string
  section: 'journal'
  topic: string
  difficulty: Difficulty
  event_text: string
  /** 証憑テーブル等の添付資料 */
  documents?: ProblemDocument[]
  /** 語群（記号→勘定科目）。未設定時は choices から自動生成 */
  symbols?: SymbolChoice[]
  debit: Entry[]
  credit: Entry[]
  /** 後方互換：symbols が無い旧データ用 */
  choices: string[]
  hint: string | null
  explanation: string
}

export type { Difficulty }

// ============================================================
// 第2問: 勘定記入
// ============================================================
export type LedgerCellType = 'given' | 'blank_symbol' | 'blank_amount' | 'blank_date'

export interface LedgerCell {
  type: LedgerCellType
  value?: string | number
  answer?: string | number
  scored: boolean
}

export interface LedgerRow {
  left:  { date: LedgerCell; desc: LedgerCell; amount: LedgerCell }
  right: { date: LedgerCell; desc: LedgerCell; amount: LedgerCell }
}

export interface LedgerProblem {
  id: string
  section: 'ledger'
  topic: string
  account_name: string
  event_text: string
  documents?: ProblemDocument[]
  word_bank: SymbolChoice[]
  rows: LedgerRow[]
  hint: string | null
  explanation: string
}

export interface LedgerResult {
  correct: boolean
  score: number
  total: number
  cellResults: boolean[][]
}

// ============================================================
// 第3問: 財務諸表
// ============================================================
export type StatementCellType =
  | 'given_label' | 'given_amount'
  | 'blank_amount'
  | 'blank_contra'   // △表記の絶対値入力（answer=絶対値, answer2=純額）
  | 'blank_account'  // 勘定科目名入力（suffix: 後置テキスト例 '消費税'）

export interface StatementCell {
  type: StatementCellType
  value?: string | number | null
  answer?: string | number
  answer2?: number       // blank_contra のみ: 純額（= 元資産 - contra）
  suffix?: string        // blank_account のみ: 後置テキスト
}

export interface StatementRow {
  left:  { label: StatementCell; amount: StatementCell }
  right: { label: StatementCell; amount: StatementCell }
}

export interface StatementProblem {
  id: string
  section: 'statement'
  topic: string
  event_text: string
  documents?: ProblemDocument[]
  bs_rows: StatementRow[]
  hint: string | null
  explanation: string
}

export interface StatementResult {
  correct: boolean
  score: number
  total: number
  rowResults: { rowIndex: number; leftOk: boolean; rightOk: boolean }[]
}