// ──────────────────────────────────────────
// Text (한국어 전용)
// ──────────────────────────────────────────
const APP_TITLE = '스타트업 지원 심사 판단 실험';

const GRADE_OPTIONS = ['1학년', '2학년', '3학년'];

const VAR_LABELS = {
    안정성: '안정성',
    수익_가능성: '수익 가능성',
    자금_효율성: '자금 효율성',
    사업_계획_완성도: '사업 계획 완성도',
    사회적_가치: '사회적 가치',
};

const JUDGMENT_SCALE = ['무조건\n탈락', '탈락', '보통', '선발', '무조건\n선발'];

const AHP_LEVELS = { 3: '약간', 5: '꽤', 7: '매우', 9: '극히' };

const LIKERT_QUESTIONS = [
    '모델의 판단 결과를 보고 놀라웠다.',
    '내 직관보다 모델의 판단이 더 합리적이라고 생각한다.',
    '이 선발 결정을 모델에게 맡겨도 괜찮다고 생각한다.',
    '이번 판단은 온전히 내 의지로 한 것이라고 느낀다.',
];

const LIKERT_SCALE = [
    '전혀\n아니다',
    '아니다',
    '보통',
    '그렇다',
    '매우\n그렇다',
];

const ALERT_FILL_ALL = '모든 항목을 입력해 주세요.';
const ALERT_SELECT_JUDGMENT = '먼저 판단을 선택해 주세요.';
const LEAVE_WARNING = '실험이 완료되지 않았습니다. 나가시겠습니까?';

// ──────────────────────────────────────────
// State
// ──────────────────────────────────────────
const state = {
    step: 1,
    started: false,

    // Step 1
    meta: { grade: '', timestamp: null },

    // Step 2
    shuffledCases: [],
    caseIndex: 0,
    currentJudgment: null, // 1-5 Likert
    caseStartTime: null,
    intuitive_judgments: [],

    // Step 3
    pairIndex: 0,
    sliderValues: Array(10).fill(0),
    pairwiseRaw: null,
    ahpResult: null,

    // Step 4 / 5
    comparison: [],
    post_survey: { q1: null, q2: null, q3: null, q4: null, open_response: '' },
    submitted: false,
    _payload: null,
};

// ──────────────────────────────────────────
// Render entry point
// ──────────────────────────────────────────
function renderApp() {
    renderHeader();
    renderMain();
}

function renderHeader() {
    const el = document.getElementById('app-header');
    if (!el) return;
    el.innerHTML = `
    <div class="header-inner">
      <span class="header-title">${APP_TITLE}</span>
      <span class="header-name">대구국제고 3학년 5반 이승준</span>
    </div>
  `;
}

function renderMain() {
    const el = document.getElementById('app-main');
    if (!el) return;
    switch (state.step) {
        case 1:
            el.innerHTML = renderStep1();
            bindStep1();
            break;
        case 2:
            el.innerHTML = renderStep2();
            bindStep2();
            break;
        case 3:
            el.innerHTML = renderStep3();
            bindStep3();
            break;
        case 4:
            el.innerHTML = renderStep4();
            break;
        case 5:
            el.innerHTML = renderStep5();
            bindStep5();
            break;
        case 'complete':
            el.innerHTML = renderComplete();
            bindComplete();
            break;
    }
}

// ──────────────────────────────────────────
// STEP 1
// ──────────────────────────────────────────
function renderStep1() {
    const { meta } = state;
    const gradeOpts = GRADE_OPTIONS.map(
        (o) => `
    <label class="${meta.grade === o ? 'selected' : ''}">
      <input type="radio" name="grade" value="${o}" ${meta.grade === o ? 'checked' : ''} />
      ${o}
    </label>
  `,
    ).join('');

    return `
    <div class="step-wrap">
      <div class="card">
        <h1 class="section-title">스타트업 지원 심사 판단 실험</h1>
        <p class="section-subtitle">당신은 스타트업 지원 프로그램의 심사위원입니다. 제기되는 질문에 따라서 성실히 답변해주시면 감사하겠습니다.<br>총 소요 시간은 10분 이내입니다.</p>

        <div class="form-group">
          <label>학년</label>
          <div class="radio-group" id="rg-grade">${gradeOpts}</div>
        </div>

        <div class="btn-row" style="margin-top:1.5rem">
          <button class="btn btn-primary btn-lg btn-full" id="btn-start">실험 시작</button>
        </div>
      </div>
    </div>
  `;
}

function bindStep1() {
    document.getElementById('rg-grade').addEventListener('click', (e) => {
        const lbl = e.target.closest('label');
        if (!lbl) return;
        const val = lbl.querySelector('input').value;
        state.meta.grade = val;
        document
            .querySelectorAll('#rg-grade label')
            .forEach((l) =>
                l.classList.toggle(
                    'selected',
                    l.querySelector('input').value === val,
                ),
            );
    });

    document.getElementById('btn-start').addEventListener('click', () => {
        if (!state.meta.grade) {
            alert(ALERT_FILL_ALL);
            return;
        }
        state.meta.timestamp = Date.now();
        state.shuffledCases = shuffleCases();
        state.caseIndex = 0;
        state.started = true;
        enableLeaveWarning();
        goStep(2);
    });
}

// ──────────────────────────────────────────
// STEP 2
// ──────────────────────────────────────────
function renderStep2() {
    const total = state.shuffledCases.length;
    const idx = state.caseIndex;
    const pct = Math.round((idx / total) * 100);
    const c = state.shuffledCases[idx];

    const varRows = VARS.map((key) => {
        const score = c[key];
        const level = getScoreLevel(score);
        return `
      <div class="var-row">
        <span class="var-name">${VAR_LABELS[key]}</span>
        <div class="var-bar-track">
          <div class="var-bar-fill" data-level="${level}" style="width:${score}%"></div>
        </div>
        <span class="var-score">${score}</span>
      </div>
    `;
    }).join('');

    const likertBtns = JUDGMENT_SCALE.map((label, i) => {
        const val = i + 1;
        const active = state.currentJudgment === val;
        return `
      <button class="judgment-likert-btn ${active ? 'active' : ''}" data-val="${val}">
        <span class="jl-num">${val}</span>
        <span class="jl-label">${label.replace('\n', '<br>')}</span>
      </button>
    `;
    }).join('');

    return `
    <div class="step-wrap">
      <p class="step-instruction">당신은 스타트업 지원 프로그램의 심사위원입니다. 아래 팀의 정보를 보고 지원금 지급 가능성을 직관적으로 평가해주세요.</p>

      <div class="progress-bar-wrap">
        <div class="progress-label">
          <span>${idx + 1} / ${total}</span>
        </div>
        <div class="progress-track">
          <div class="progress-fill" style="width:${pct}%"></div>
        </div>
      </div>

      <div class="card case-card">
        <div class="case-header">
          <span class="team-badge">Team ${c.teamLetter}</span>
        </div>

        <div>${varRows}</div>

        <div class="judgment-section">
          <p class="judgment-label">이 팀의 지원금 지급 가능성을 평가하세요</p>
          <div class="judgment-likert-row" id="jl-row">${likertBtns}</div>
        </div>

        <div class="btn-row end" style="margin-top:1.2rem">
          <button class="btn btn-primary" id="btn-case-next" ${state.currentJudgment === null ? 'disabled' : ''}>다음</button>
        </div>
      </div>
    </div>
  `;
}

function bindStep2() {
    const caseStart = Date.now();

    document.getElementById('jl-row').addEventListener('click', (e) => {
        const btn = e.target.closest('.judgment-likert-btn');
        if (!btn) return;
        const val = parseInt(btn.dataset.val);
        state.currentJudgment = val;
        document
            .querySelectorAll('.judgment-likert-btn')
            .forEach((b) =>
                b.classList.toggle('active', parseInt(b.dataset.val) === val),
            );
        document.getElementById('btn-case-next').disabled = false;
    });

    document.getElementById('btn-case-next').addEventListener('click', () => {
        if (state.currentJudgment === null) {
            alert(ALERT_SELECT_JUDGMENT);
            return;
        }
        const elapsed = Date.now() - caseStart;
        const c = state.shuffledCases[state.caseIndex];
        state.intuitive_judgments.push({
            case_id: c.id,
            presented_order: state.caseIndex + 1,
            judgment: state.currentJudgment, // 1-5
            response_time_ms: elapsed,
        });
        state.caseIndex++;
        state.currentJudgment = null;
        if (state.caseIndex >= state.shuffledCases.length) {
            goStep(3);
        } else {
            renderMain();
        }
    });
}

// ──────────────────────────────────────────
// STEP 3
// ──────────────────────────────────────────
const AHP_PAIR_LABELS = [
    ['안정성', '수익 가능성'],
    ['안정성', '자금 효율성'],
    ['안정성', '사업 계획 완성도'],
    ['안정성', '사회적 가치'],
    ['수익 가능성', '자금 효율성'],
    ['수익 가능성', '사업 계획 완성도'],
    ['수익 가능성', '사회적 가치'],
    ['자금 효율성', '사업 계획 완성도'],
    ['자금 효율성', '사회적 가치'],
    ['사업 계획 완성도', '사회적 가치'],
];

function getPairLabels(idx) {
    return AHP_PAIR_LABELS[idx];
}

function getAHPDescription(sliderPos, leftLabel, rightLabel) {
    if (sliderPos === 0) return '두 기준이 동등하게 중요합니다';
    const ahpVal = Math.abs(sliderToStored(sliderPos)); // 3,5,7,9
    const level = AHP_LEVELS[ahpVal] || String(ahpVal);
    const crit = sliderPos < 0 ? leftLabel : rightLabel;
    return `${crit}이(가) ${level} 더 중요합니다`;
}

function renderStep3() {
    const idx = state.pairIndex;
    const total = AHP_PAIRS.length;
    const pct = Math.round((idx / total) * 100);
    const [left, right] = getPairLabels(idx);
    const sliderVal = state.sliderValues[idx];
    const desc = getAHPDescription(sliderVal, left, right);

    const leftActive = sliderVal < 0 ? 'crit-active-left' : '';
    const rightActive = sliderVal > 0 ? 'crit-active-right' : '';

    return `
    <div class="step-wrap">
      <p class="step-instruction">제시되는 2개의 평가 기준 중 어느 것이 더 중요한지 비교해주세요. 왼쪽이 더 중요하면 슬라이더를 왼쪽으로, 오른쪽이 더 중요하면 오른쪽으로 움직이세요.</p>

      <div class="progress-bar-wrap">
        <div class="progress-label">
          <span>${idx + 1} / ${total}</span>
        </div>
        <div class="progress-track">
          <div class="progress-fill" style="width:${pct}%"></div>
        </div>
      </div>

      <div class="card">
        <h2 class="section-title" style="font-size:1.1rem">AHP 쌍대비교</h2>

        <div class="ahp-pair-card">
          <div class="pair-criteria">
            <div class="crit crit-left ${leftActive}" id="crit-left">${left}</div>
            <div class="vs-badge">VS</div>
            <div class="crit crit-right ${rightActive}" id="crit-right">${right}</div>
          </div>

          <div class="ahp-slider-wrap">
            <div class="ahp-scale-labels">
              <span>9</span><span>7</span><span>5</span><span>3</span>
              <span class="sc-mid">1</span>
              <span>3</span><span>5</span><span>7</span><span>9</span>
            </div>
            <input type="range" class="ahp-slider" id="ahp-slider"
              min="-4" max="4" step="1" value="${sliderVal}" />
          </div>

          <div class="ahp-description" id="ahp-desc">${desc}</div>
        </div>

        <div class="btn-row end" style="margin-top:1.2rem">
          <button class="btn btn-primary" id="btn-pair-next">다음</button>
        </div>
      </div>
    </div>
  `;
}

function bindStep3() {
    const idx = state.pairIndex;
    const [left, right] = getPairLabels(idx);

    const slider = document.getElementById('ahp-slider');
    if (slider) {
        slider.addEventListener('input', (e) => {
            const val = parseInt(e.target.value);
            state.sliderValues[idx] = val;
            document.getElementById('ahp-desc').textContent = getAHPDescription(
                val,
                left,
                right,
            );
            document.getElementById('crit-left').className =
                `crit crit-left ${val < 0 ? 'crit-active-left' : ''}`;
            document.getElementById('crit-right').className =
                `crit crit-right ${val > 0 ? 'crit-active-right' : ''}`;
        });
    }

    const nextBtn = document.getElementById('btn-pair-next');
    if (nextBtn) nextBtn.addEventListener('click', advancePair);
}

function advancePair() {
    const total = AHP_PAIRS.length;
    if (state.pairIndex < total - 1) {
        state.pairIndex++;
        renderMain();
    } else {
        const raw = state.sliderValues.map((s) => sliderToStored(s));
        state.pairwiseRaw = raw;
        // CR은 분석용으로 계속 기록하되, 모순이 있어도 재입력 없이 그대로 진행
        state.ahpResult = runAHP(raw);
        finalizeAHP();
        goStep(4);
    }
}

// Convert Likert 1-5 to judgment category for comparison with model
function likertToJudgment(likert) {
    if (likert >= 4) return 'select';
    if (likert <= 2) return 'reject';
    return 'neutral'; // 3
}

function finalizeAHP() {
    const weights = state.ahpResult.weights;
    state.comparison = state.shuffledCases.map((c, i) => {
        const modelScore = calcModelScore(c, weights);
        const modelJudgment = modelScore >= 50 ? 'select' : 'reject';
        const rawLikert = state.intuitive_judgments[i]?.judgment ?? null;
        const intuitiveCategory =
            rawLikert !== null ? likertToJudgment(rawLikert) : null;
        const match =
            intuitiveCategory === 'neutral'
                ? null
                : intuitiveCategory === modelJudgment
                  ? true
                  : false;
        return {
            case_id: c.id,
            team: c.teamLetter,
            type: c.type,
            model_score: Math.round(modelScore * 10) / 10,
            model_judgment: modelJudgment,
            intuitive_likert: rawLikert,
            intuitive_category: intuitiveCategory,
            match,
        };
    });
}

// ──────────────────────────────────────────
// STEP 4
// ──────────────────────────────────────────
function renderStep4() {
    const weights = state.ahpResult.weights;

    const weightRows = VARS.map((key, i) => {
        const pct = Math.round(weights[i] * 100);
        return `
      <div class="wc-row">
        <span class="wc-label">${VAR_LABELS[key]}</span>
        <div class="wc-track"><div class="wc-fill" style="width:${pct}%"></div></div>
        <span class="wc-pct">${pct}%</span>
      </div>
    `;
    }).join('');

    const comp = state.comparison;
    // Exclude neutral (match===null) from mismatch counts
    const decidable = comp.filter((c) => c.match !== null);
    const totalMismatch = decidable.filter((c) => !c.match).length;
    const baseline = decidable.filter((c) => c.type === 'baseline');
    const spike = decidable.filter((c) => c.type === 'spike');
    const conflict = decidable.filter((c) => c.type === 'conflict');
    const { CR } = state.ahpResult;

    const rows = comp
        .map((c) => {
            const mis = c.match === false;
            const neu = c.match === null;
            const mLabel =
                c.model_judgment === 'select'
                    ? `<span class="badge badge-select">선발</span>`
                    : `<span class="badge badge-reject">탈락</span>`;
            const iLabel =
                c.intuitive_category === 'select'
                    ? `<span class="badge badge-select">${c.intuitive_likert}</span>`
                    : c.intuitive_category === 'reject'
                      ? `<span class="badge badge-reject">${c.intuitive_likert}</span>`
                      : `<span class="badge badge-neutral">${c.intuitive_likert}</span>`;
            const matchBadge =
                c.match === true
                    ? `<span class="badge badge-match">✓</span>`
                    : c.match === false
                      ? `<span class="badge badge-mismatch">✗</span>`
                      : `<span class="badge badge-neutral">△</span>`;
            return `
      <tr class="${mis ? 'mismatch' : neu ? 'neutral-row' : ''}">
        <td>Team ${c.team}</td>
        <td>${c.model_score}</td>
        <td>${mLabel}</td>
        <td>${iLabel}</td>
        <td>${matchBadge}</td>
      </tr>
    `;
        })
        .join('');

    return `
    <div class="step-wrap">
      <div class="card">
        <h2 class="section-title">결과 비교</h2>
        <h3 style="font-size:.95rem;font-weight:700;margin-bottom:.75rem">나의 판단 기준 (AHP 가중치)</h3>
        <div class="weight-chart">${weightRows}</div>
      </div>

      <div class="card">
        <h3 style="font-size:.95rem;font-weight:700;margin-bottom:.5rem">핵심 통계</h3>
        <div class="stats-grid">
          <div class="stat-box ${totalMismatch > 7 ? 'stat-warn' : 'stat-ok'}">
            <div class="stat-val">${totalMismatch}/${decidable.length}</div>
            <div class="stat-label">전체 불일치율</div>
          </div>
          <div class="stat-box">
            <div class="stat-val">${baseline.filter((c) => !c.match).length}/${baseline.length}</div>
            <div class="stat-label">베이스라인<br>불일치율</div>
          </div>
          <div class="stat-box">
            <div class="stat-val">${spike.filter((c) => !c.match).length}/${spike.length}</div>
            <div class="stat-label">스파이크 사례<br>불일치율</div>
          </div>
          <div class="stat-box">
            <div class="stat-val">${conflict.filter((c) => !c.match).length}/${conflict.length}</div>
            <div class="stat-label">충돌 사례<br>불일치율</div>
          </div>
          <div class="stat-box ${CR > 0.1 ? 'stat-warn' : 'stat-ok'}">
            <div class="stat-val">${CR.toFixed(3)}</div>
            <div class="stat-label">CR (일관성 비율)</div>
          </div>
        </div>
        <p class="text-muted mt-2">총 불일치: ${totalMismatch} / ${decidable.length}건 (보통 제외)</p>
      </div>

      <div class="card">
        <h3 style="font-size:.95rem;font-weight:700;margin-bottom:.5rem">사례별 모델 vs 직관 비교</h3>
        <div class="comparison-table-wrap">
          <table>
            <thead>
              <tr>
                <th>팀</th>
                <th>모델 점수</th>
                <th>모델 판단</th>
                <th>직관 (1-5)</th>
                <th>일치</th>
              </tr>
            </thead>
            <tbody>${rows}</tbody>
          </table>
        </div>
      </div>

      <div class="btn-row center" style="margin-top:1rem">
        <button class="btn btn-primary btn-lg" onclick="goStep(5)">사후 설문으로 이동</button>
      </div>
    </div>
  `;
}

// ──────────────────────────────────────────
// STEP 5
// ──────────────────────────────────────────
function renderStep5() {
    const groups = LIKERT_QUESTIONS.map((q, qi) => {
        const opts = LIKERT_SCALE.map((label, si) => {
            const val = si + 1;
            const checked = state.post_survey[`q${qi + 1}`] === val;
            return `
        <label>
          <input type="radio" name="q${qi + 1}" value="${val}" ${checked ? 'checked' : ''} />
          <div class="likert-btn">${val}</div>
          <span class="likert-desc">${label.replace('\n', '<br>')}</span>
        </label>
      `;
        }).join('');
        return `
      <div class="likert-group">
        <p class="likert-q">${qi + 1}. ${q}</p>
        <div class="likert-options">${opts}</div>
      </div>
    `;
    }).join('');

    return `
    <div class="step-wrap">
      <div class="card">
        <h2 class="section-title">사후 설문</h2>
        <p class="section-subtitle">마지막으로 간단한 설문에 답해주세요.</p>
        ${groups}
        <div class="form-group">
          <label>모델 판단과 직관이 달랐을 때 어떤 생각이 들었나요? (선택)</label>
          <textarea class="open-textarea" id="open-resp" placeholder="자유롭게 작성해 주세요...">${escHtml(state.post_survey.open_response)}</textarea>
        </div>
        <div class="btn-row end" style="margin-top:1.5rem">
          <button class="btn btn-primary btn-lg" id="btn-submit">제출하기</button>
        </div>
      </div>
    </div>
  `;
}

function bindStep5() {
    document
        .querySelectorAll('.likert-options input[type="radio"]')
        .forEach((inp) => {
            inp.addEventListener('change', (e) => {
                state.post_survey[e.target.name] = parseInt(e.target.value);
            });
        });
    document.getElementById('open-resp').addEventListener('input', (e) => {
        state.post_survey.open_response = e.target.value;
    });
    document.getElementById('btn-submit').addEventListener('click', () => {
        const { q1, q2, q3, q4 } = state.post_survey;
        if (!q1 || !q2 || !q3 || !q4) {
            alert(ALERT_FILL_ALL);
            return;
        }
        submitData();
    });
}

// ──────────────────────────────────────────
// Submit & Complete
// ──────────────────────────────────────────
function buildPayload() {
    return {
        meta: { timestamp: state.meta.timestamp, grade: state.meta.grade },
        intuitive_judgments: state.intuitive_judgments,
        ahp: {
            pairwise_raw: state.pairwiseRaw,
            weights: state.ahpResult.weights,
            lambda_max: state.ahpResult.lambdaMax,
            CI: state.ahpResult.CI,
            CR: state.ahpResult.CR,
            cr_warning_shown: false, // CR 경고 UI 제거 — CSV 컬럼 호환용으로 유지
        },
        comparison: state.comparison,
        post_survey: state.post_survey,
    };
}

async function submitData() {
    if (state.submitted) return;
    state.submitted = true;
    disableLeaveWarning();
    const payload = buildPayload();
    try {
        await fetch('/api/submit', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(payload),
        });
    } catch (e) {
        console.warn('Server submit failed:', e);
    }
    state._payload = payload;
    state.step = 'complete';
    renderApp();
}

function renderComplete() {
    return `
    <div class="step-wrap">
      <div class="card">
        <div class="complete-screen">
          <h2 class="complete-title">참여해 주셔서 감사합니다!</h2>
          <p class="complete-desc" style="white-space:pre-line">실험이 완료되었습니다.
소중한 시간을 내어 참여해 주셔서 진심으로 감사드립니다.</p>
        </div>
      </div>
    </div>
  `;
}

function bindComplete() {}

// ──────────────────────────────────────────
// Navigation & utilities
// ──────────────────────────────────────────
function goStep(n) {
    state.step = n;
    renderApp();
    window.scrollTo({ top: 0, behavior: 'smooth' });
}

function enableLeaveWarning() {
    window._leaveHandler = (e) => {
        e.preventDefault();
        e.returnValue = LEAVE_WARNING;
    };
    window.addEventListener('beforeunload', window._leaveHandler);
}

function disableLeaveWarning() {
    if (window._leaveHandler) {
        window.removeEventListener('beforeunload', window._leaveHandler);
        window._leaveHandler = null;
    }
}

function escHtml(str) {
    return String(str)
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/"/g, '&quot;');
}

document.addEventListener('DOMContentLoaded', renderApp);