src/store/statementStore.ts

import { create } from 'zustand'
import type { StatementProblem, StatementResult } from '../types'
import { judgeStatement } from '../lib/judge'
import { fetchStatementProblems } from '../lib/supabase'
import { useAuth } from './authStore'

export type StatementPhase = 'select' | 'loading' | 'playing' | 'result'

// ゲストモード用サンプル問題（貸借対照表の作成）
const SAMPLE_STATEMENT: StatementProblem = {
  id: 'sample-statement-1',
  section: 'statement',
  topic: 'fixed_asset',
  event_text:
    '下記の決算整理前残高試算表にもとづき、決算整理を行って貸借対照表を完成させなさい。①貸倒引当金：売掛金の2%設定（差額補充法）。②減価償却：建物30年・備品8年（定額法・残存価額¥0）。③未払利息：借入金¥1,000,000の2か月分（年利3.6%・月割）。④消費税精算：仮受消費税-仮払消費税=未払消費税。⑤法人税等：¥100,000。',
  documents: [
    {
      type: 'table',
      title: '決算整理前残高試算表（関連部分）',
      headers: ['勘定科目（借方）', '金額', '勘定科目（貸方）', '金額'],
      rows: [
        ['売掛金', '450,000', '貸倒引当金', '4,000'],
        ['建物', '2,400,000', '建物減価償却累計額', '1,040,000'],
        ['備品', '700,000', '備品減価償却累計額', '262,500'],
        ['仮払消費税', '88,000', '借入金（年利3.6%・残2か月）', '1,000,000'],
        ['', '', '買掛金', '330,000'],
        ['', '', '仮受消費税', '160,000'],
      ],
    },
  ],
  bs_rows: [
    {
      left:  { label: { type: 'given_label', value: '売掛金' },
                amount: { type: 'blank_amount', answer: 450000 } },
      right: { label: { type: 'given_label', value: '買掛金' },
                amount: { type: 'given_amount', value: 330000 } },
    },
    {
      left:  { label: { type: 'given_label', value: '貸倒引当金' },
                amount: { type: 'blank_contra', answer: 9000, answer2: 441000 } },
      right: { label: { type: 'given_label', value: '未払費用' },
                amount: { type: 'blank_amount', answer: 6000 } },
    },
    {
      left:  { label: { type: 'given_label', value: '建物' },
                amount: { type: 'blank_amount', answer: 2400000 } },
      right: { label: { type: 'blank_account', answer: '未払', suffix: '消費税' },
                amount: { type: 'blank_amount', answer: 72000 } },
    },
    {
      left:  { label: { type: 'given_label', value: '建物減価償却累計額' },
                amount: { type: 'blank_contra', answer: 1120000, answer2: 1280000 } },
      right: { label: { type: 'given_label', value: '未払法人税等' },
                amount: { type: 'blank_amount', answer: 100000 } },
    },
    {
      left:  { label: { type: 'given_label', value: '備品' },
                amount: { type: 'blank_amount', answer: 700000 } },
      right: { label: { type: 'given_label', value: null },
                amount: { type: 'given_amount', value: null } },
    },
    {
      left:  { label: { type: 'given_label', value: '備品減価償却累計額' },
                amount: { type: 'blank_contra', answer: 350000, answer2: 350000 } },
      right: { label: { type: 'given_label', value: null },
                amount: { type: 'given_amount', value: null } },
    },
  ],
  hint: '①9,000（450,000×2%）②建物80,000（÷30）・備品87,500（÷8）③6,000（×3.6%×2/12）④72,000（160,000-88,000）',
  explanation:
    '貸倒引当金9,000（追加5,000）。建物累計1,120,000（+80,000）、備品累計350,000（+87,500）。未払費用6,000。未払消費税72,000。未払法人税等100,000。',
}

interface StatementState {
  phase: StatementPhase
  problem: StatementProblem | null
  inputs: Record<string, string | number>
  result: StatementResult | null
  error: string | null

  start: () => Promise<void>
  setInput: (key: string, value: string | number) => void
  submit: () => void
  retry: () => void
  backToSelect: () => void
}

export const useStatement = create<StatementState>((set, get) => ({
  phase: 'select',
  problem: null,
  inputs: {},
  result: null,
  error: null,

  start: async () => {
    set({ phase: 'loading', error: null })
    const isGuest = useAuth.getState().authStatus === 'guest'

    if (isGuest) {
      set({ phase: 'playing', problem: SAMPLE_STATEMENT, inputs: {}, result: null })
      return
    }

    try {
      const problems = await fetchStatementProblems()
      if (problems.length === 0) {
        set({ phase: 'select', error: '財務諸表問題がまだありません。管理者に問い合わせください。' })
        return
      }
      set({ phase: 'playing', problem: problems[0], inputs: {}, result: null })
    } catch (e) {
      set({
        phase: 'select',
        error: e instanceof Error ? e.message : '問題の取得に失敗しました。',
      })
    }
  },

  setInput: (key, value) => {
    set((s) => ({ inputs: { ...s.inputs, [key]: value } }))
  },

  submit: () => {
    const { problem, inputs } = get()
    if (!problem) return
    const result = judgeStatement(problem, inputs)
    set({ phase: 'result', result })
  },

  retry: () => {
    set({ inputs: {}, result: null, phase: 'playing' })
  },

  backToSelect: () => {
    set({ phase: 'select', problem: null, inputs: {}, result: null, error: null })
  },
}))