/**
 * ai-assistant.js — AI 어시스턴트 페이지 스크립트
 */

let currentUser = null;
let projects = [];
let chatHistory = [];

// 애니메이션 함수들
function animateHeaderAppearance() {
    const header = document.getElementById('commonHeader');
    if (header) {
        header.classList.add('header-fade-in');
    }
}

// 페이지 초기화
async function initializeAiAssistant() {
    try {
        currentUser = await window.authManager.checkAuth();
        if (!currentUser) {
            document.getElementById('loadingScreen').style.display = 'none';
            window.location.href = '/';
            return;
        }

        window.pagePermissionManager.setUser(currentUser);
        await window.pagePermissionManager.loadPagePermissions();

        if (!window.pagePermissionManager.canAccessPage('ai_assistant')) {
            alert('AI 어시스턴트 접근 권한이 없습니다.');
            window.location.href = '/';
            return;
        }

        if (window.commonHeader) {
            await window.commonHeader.init(currentUser, 'ai_assistant');
            setTimeout(() => animateHeaderAppearance(), 100);
        }

        await loadProjects();
        checkAiHealth();
        document.getElementById('loadingScreen').style.display = 'none';

    } catch (error) {
        console.error('AI 어시스턴트 초기화 실패:', error);
        alert('페이지를 불러오는데 실패했습니다.');
        document.getElementById('loadingScreen').style.display = 'none';
    }
}

// AuthManager 대기 후 초기화
document.addEventListener('DOMContentLoaded', () => {
    const checkAuthManager = () => {
        if (window.authManager) {
            initializeAiAssistant();
        } else {
            setTimeout(checkAuthManager, 100);
        }
    };
    checkAuthManager();
});

// 프로젝트 로드
async function loadProjects() {
    try {
        const apiUrl = window.API_BASE_URL || '/api';
        const response = await fetch(`${apiUrl}/projects/`, {
            headers: {
                'Authorization': `Bearer ${TokenManager.getToken()}`,
                'Content-Type': 'application/json'
            }
        });

        if (response.ok) {
            projects = await response.json();
            updateProjectFilters();
        }
    } catch (error) {
        console.error('프로젝트 로드 실패:', error);
    }
}

function updateProjectFilters() {
    const selects = ['qaProjectFilter', 'searchProjectFilter'];
    selects.forEach(id => {
        const select = document.getElementById(id);
        if (!select) return;
        // 기존 옵션 유지 (첫 번째 "전체 프로젝트")
        while (select.options.length > 1) select.remove(1);
        projects.forEach(p => {
            const opt = document.createElement('option');
            opt.value = p.id;
            opt.textContent = p.project_name;
            select.appendChild(opt);
        });
    });
}

// ─── AI 상태 체크 ───────────────────────────────────────
async function checkAiHealth() {
    try {
        const health = await AiAPI.checkHealth();
        const statusText = document.getElementById('aiStatusText');
        const statusIcon = document.getElementById('aiStatusIcon');
        const embeddingCount = document.getElementById('aiEmbeddingCount');
        const modelName = document.getElementById('aiModelName');

        if (health.status === 'healthy' || health.status === 'ok') {
            statusText.textContent = '연결됨';
            statusText.classList.add('text-green-600');
            statusIcon.innerHTML = '<i class="fas fa-check-circle text-green-500 text-xl"></i>';
            statusIcon.className = 'w-10 h-10 rounded-full bg-green-50 flex items-center justify-center';
        } else {
            statusText.textContent = '연결 안됨';
            statusText.classList.add('text-red-500');
            statusIcon.innerHTML = '<i class="fas fa-times-circle text-red-500 text-xl"></i>';
            statusIcon.className = 'w-10 h-10 rounded-full bg-red-50 flex items-center justify-center';
        }

        const embCount = health.embedding_count
            ?? health.total_embeddings
            ?? health.embeddings?.total_documents;
        if (embCount !== undefined) {
            embeddingCount.textContent = embCount.toLocaleString() + '건';
        }

        const model = health.model
            || health.llm_model
            || (health.ollama?.models?.[0]);
        if (model) {
            modelName.textContent = model;
        }
    } catch (error) {
        console.error('AI 상태 체크 실패:', error);
        document.getElementById('aiStatusText').textContent = '오류';
    }
}

// ─── Q&A 채팅 ───────────────────────────────────────────
function setQuickQuestion(text) {
    document.getElementById('qaQuestion').value = text;
    document.getElementById('qaQuestion').focus();
}

async function submitQuestion() {
    const input = document.getElementById('qaQuestion');
    const question = input.value.trim();
    if (!question) return;

    const projectId = document.getElementById('qaProjectFilter').value || null;

    // 플레이스홀더 제거
    const placeholder = document.getElementById('chatPlaceholder');
    if (placeholder) placeholder.remove();

    // 사용자 메시지 추가
    appendChatMessage('user', question);
    input.value = '';
    chatHistory.push({ role: 'user', content: question });

    // 로딩 표시
    appendChatLoading();

    try {
        const result = await AiAPI.askQuestion(question, projectId);
        removeChatLoading();

        if (result.available === false) {
            appendChatMessage('ai', 'AI 서비스에 연결할 수 없습니다. 잠시 후 다시 시도해주세요.');
            return;
        }

        const answer = result.answer || result.response || '답변을 생성할 수 없습니다.';
        const sources = result.sources || result.related_issues || [];
        appendChatMessage('ai', answer, sources);
        chatHistory.push({ role: 'ai', content: answer });

    } catch (error) {
        removeChatLoading();
        appendChatMessage('ai', '오류가 발생했습니다: ' + error.message);
    }
}

function appendChatMessage(role, content, sources) {
    const container = document.getElementById('chatContainer');

    const wrapper = document.createElement('div');
    wrapper.className = `flex ${role === 'user' ? 'justify-end' : 'justify-start'} mb-3`;

    const bubble = document.createElement('div');
    bubble.className = `chat-bubble ${role === 'user' ? 'chat-bubble-user' : 'chat-bubble-ai'}`;

    // 내용 렌더링
    const contentDiv = document.createElement('div');
    contentDiv.className = 'text-sm whitespace-pre-line';
    contentDiv.textContent = content;
    bubble.appendChild(contentDiv);

    // AI 답변 참고 사례
    if (role === 'ai' && sources && sources.length > 0) {
        const sourcesDiv = document.createElement('div');
        sourcesDiv.className = 'mt-2 pt-2 border-t border-gray-200';

        const sourcesTitle = document.createElement('p');
        sourcesTitle.className = 'text-xs text-gray-500 mb-1';
        sourcesTitle.textContent = '참고 사례:';
        sourcesDiv.appendChild(sourcesTitle);

        sources.forEach(source => {
            const issueId = source.issue_id || source.id;
            const desc = source.description || source.title || `이슈 #${issueId}`;
            const similarity = source.similarity ? ` (${(source.similarity * 100).toFixed(0)}%)` : '';

            const link = document.createElement('span');
            link.className = 'source-link text-xs block';
            link.textContent = `#${issueId} ${desc}${similarity}`;
            link.onclick = () => showAiIssueDetail(issueId);
            sourcesDiv.appendChild(link);
        });

        bubble.appendChild(sourcesDiv);
    }

    wrapper.appendChild(bubble);
    container.appendChild(wrapper);
    container.scrollTop = container.scrollHeight;
}

function appendChatLoading() {
    const container = document.getElementById('chatContainer');
    const wrapper = document.createElement('div');
    wrapper.className = 'flex justify-start mb-3';
    wrapper.id = 'chatLoadingBubble';

    wrapper.innerHTML = `
        <div class="chat-bubble chat-bubble-ai">
            <div class="typing-indicator">
                <div class="typing-dot"></div>
                <div class="typing-dot"></div>
                <div class="typing-dot"></div>
            </div>
        </div>
    `;

    container.appendChild(wrapper);
    container.scrollTop = container.scrollHeight;
}

function removeChatLoading() {
    const el = document.getElementById('chatLoadingBubble');
    if (el) el.remove();
}

function clearChat() {
    const container = document.getElementById('chatContainer');
    container.innerHTML = `
        <div class="text-center text-gray-400 text-sm py-8" id="chatPlaceholder">
            <i class="fas fa-robot text-4xl mb-3 text-gray-300"></i>
            <p>부적합 관련 질문을 입력하세요.</p>
            <p class="text-xs mt-1">과거 사례를 분석하여 답변합니다.</p>
        </div>
    `;
    chatHistory = [];
}

// ─── 시맨틱 검색 ────────────────────────────────────────
async function executeSemanticSearch() {
    const query = document.getElementById('searchQuery').value.trim();
    if (!query) return;

    const projectId = document.getElementById('searchProjectFilter').value || undefined;
    const category = document.getElementById('searchCategoryFilter').value || undefined;
    const limit = parseInt(document.getElementById('searchResultCount').value);

    const loading = document.getElementById('searchLoading');
    const resultsDiv = document.getElementById('searchResults');
    loading.classList.remove('hidden');
    resultsDiv.innerHTML = '';

    try {
        const filters = {};
        if (projectId) filters.project_id = parseInt(projectId);
        if (category) filters.category = category;

        const result = await AiAPI.searchSimilar(query, limit, filters);
        loading.classList.add('hidden');

        if (!result.results || result.results.length === 0) {
            resultsDiv.innerHTML = '<p class="text-sm text-gray-500 text-center py-4">검색 결과가 없습니다.</p>';
            return;
        }

        result.results.forEach((item, idx) => {
            const issueId = item.issue_id || item.id;
            const desc = item.description || '';
            const similarity = item.similarity ? (item.similarity * 100).toFixed(1) : '-';
            const category = item.category || '';
            const status = item.status || item.review_status || '';

            const card = document.createElement('div');
            card.className = 'result-item border border-gray-200 rounded-lg p-3 flex items-start gap-3';
            card.onclick = () => showAiIssueDetail(issueId);

            card.innerHTML = `
                <div class="flex-shrink-0 w-8 h-8 rounded-full bg-indigo-50 flex items-center justify-center text-xs font-bold text-indigo-600">
                    ${idx + 1}
                </div>
                <div class="flex-1 min-w-0">
                    <div class="flex items-center gap-2 mb-1">
                        <span class="text-xs font-mono text-gray-400">#${issueId}</span>
                        ${category ? `<span class="text-xs bg-gray-100 text-gray-600 px-1.5 py-0.5 rounded">${category}</span>` : ''}
                        ${status ? `<span class="text-xs bg-blue-50 text-blue-600 px-1.5 py-0.5 rounded">${status}</span>` : ''}
                    </div>
                    <p class="text-sm text-gray-700 truncate">${desc}</p>
                </div>
                <div class="flex-shrink-0 text-right">
                    <span class="text-sm font-bold text-indigo-600">${similarity}%</span>
                    <p class="text-xs text-gray-400">유사도</p>
                </div>
            `;
            resultsDiv.appendChild(card);
        });
    } catch (error) {
        loading.classList.add('hidden');
        resultsDiv.innerHTML = `<p class="text-sm text-red-500 text-center py-4">검색 중 오류가 발생했습니다.</p>`;
    }
}

// ─── 패턴 분석 ──────────────────────────────────────────
async function executePatternAnalysis() {
    const input = document.getElementById('patternInput').value.trim();
    if (!input) return;

    const loading = document.getElementById('patternLoading');
    const resultsDiv = document.getElementById('patternResults');
    loading.classList.remove('hidden');
    resultsDiv.classList.add('hidden');

    try {
        const result = await AiAPI.analyzePattern(input);
        loading.classList.add('hidden');
        resultsDiv.classList.remove('hidden');

        if (result.available === false) {
            resultsDiv.innerHTML = '<p class="text-sm text-gray-500 text-center py-4">AI 서비스에 연결할 수 없습니다.</p>';
            return;
        }

        let html = '';

        // 분석 결과
        const analysis = result.analysis || result.pattern || result.answer || '';
        if (analysis) {
            html += `
                <div class="bg-green-50 border border-green-200 rounded-lg p-4 mb-3">
                    <h4 class="text-sm font-semibold text-green-800 mb-2">
                        <i class="fas fa-chart-bar mr-1"></i>분석 결과
                    </h4>
                    <div class="text-sm text-gray-700 whitespace-pre-line">${analysis}</div>
                </div>
            `;
        }

        // 관련 이슈
        const relatedIssues = result.related_issues || result.sources || [];
        if (relatedIssues.length > 0) {
            html += `
                <div class="border border-gray-200 rounded-lg p-4">
                    <h4 class="text-sm font-semibold text-gray-700 mb-2">
                        <i class="fas fa-link mr-1"></i>관련 이슈 (${relatedIssues.length}건)
                    </h4>
                    <div class="space-y-1">
                        ${relatedIssues.map(issue => {
                            const id = issue.issue_id || issue.id;
                            const desc = issue.description || '';
                            return `<div class="result-item text-sm p-2 rounded border border-gray-100" onclick="showAiIssueDetail(${id})">
                                <span class="font-mono text-gray-400 text-xs">#${id}</span>
                                <span class="text-gray-700">${desc}</span>
                            </div>`;
                        }).join('')}
                    </div>
                </div>
            `;
        }

        resultsDiv.innerHTML = html || '<p class="text-sm text-gray-500 text-center py-4">분석 결과가 없습니다.</p>';
    } catch (error) {
        loading.classList.add('hidden');
        resultsDiv.classList.remove('hidden');
        resultsDiv.innerHTML = `<p class="text-sm text-red-500 text-center py-4">분석 중 오류가 발생했습니다.</p>`;
    }
}

// ─── AI 분류 ────────────────────────────────────────────
async function executeClassification(useRAG) {
    const description = document.getElementById('classifyDescription').value.trim();
    if (!description) {
        alert('부적합 설명을 입력해주세요.');
        return;
    }

    const detailNotes = document.getElementById('classifyDetail').value.trim();
    const loading = document.getElementById('classifyLoading');
    const resultsDiv = document.getElementById('classifyResults');
    loading.classList.remove('hidden');
    resultsDiv.classList.add('hidden');

    try {
        const result = useRAG
            ? await AiAPI.classifyWithRAG(description, detailNotes)
            : await AiAPI.classifyIssue(description, detailNotes);

        loading.classList.add('hidden');
        resultsDiv.classList.remove('hidden');

        if (result.available === false) {
            resultsDiv.innerHTML = '<p class="text-sm text-gray-500 text-center py-4">AI 서비스에 연결할 수 없습니다.</p>';
            return;
        }

        const methodLabel = useRAG ? 'RAG 분류 (과거 사례 참고)' : '기본 분류';
        const methodColor = useRAG ? 'purple' : 'amber';

        let html = `
            <div class="bg-${methodColor}-50 border border-${methodColor}-200 rounded-lg p-4">
                <h4 class="text-sm font-semibold text-${methodColor}-800 mb-3">
                    <i class="fas fa-${useRAG ? 'tags' : 'tag'} mr-1"></i>${methodLabel}
                </h4>
                <div class="grid grid-cols-2 gap-3">
        `;

        // 분류 결과 필드 표시
        const fields = [
            { key: 'category', label: '카테고리' },
            { key: 'discipline', label: '공종' },
            { key: 'severity', label: '심각도' },
            { key: 'root_cause', label: '근본 원인' },
            { key: 'priority', label: '우선순위' },
            { key: 'suggested_action', label: '권장 조치' }
        ];

        fields.forEach(field => {
            const val = result[field.key] || result.classification?.[field.key];
            if (val) {
                html += `
                    <div>
                        <span class="text-xs text-gray-500">${field.label}</span>
                        <p class="text-sm font-medium text-gray-800">${val}</p>
                    </div>
                `;
            }
        });

        html += '</div>';

        // 신뢰도
        const confidence = result.confidence || result.classification?.confidence;
        if (confidence) {
            const pct = (typeof confidence === 'number' && confidence <= 1)
                ? (confidence * 100).toFixed(0)
                : confidence;
            html += `
                <div class="mt-3 pt-3 border-t border-${methodColor}-200">
                    <span class="text-xs text-gray-500">신뢰도</span>
                    <div class="flex items-center gap-2 mt-1">
                        <div class="flex-1 bg-gray-200 rounded-full h-2">
                            <div class="bg-${methodColor}-500 h-2 rounded-full" style="width: ${pct}%"></div>
                        </div>
                        <span class="text-sm font-bold text-${methodColor}-600">${pct}%</span>
                    </div>
                </div>
            `;
        }

        // RAG 참고 사례
        const sources = result.sources || result.related_issues || result.similar_cases || [];
        if (sources.length > 0) {
            html += `
                <div class="mt-3 pt-3 border-t border-${methodColor}-200">
                    <span class="text-xs text-gray-500">참고 사례</span>
                    <div class="mt-1 space-y-1">
                        ${sources.map(s => {
                            const id = s.issue_id || s.id;
                            const desc = s.description || '';
                            return `<div class="result-item text-xs p-1.5 rounded border border-gray-100" onclick="showAiIssueDetail(${id})">
                                <span class="font-mono text-gray-400">#${id}</span> ${desc}
                            </div>`;
                        }).join('')}
                    </div>
                </div>
            `;
        }

        html += '</div>';
        resultsDiv.innerHTML = html;
    } catch (error) {
        loading.classList.add('hidden');
        resultsDiv.classList.remove('hidden');
        resultsDiv.innerHTML = `<p class="text-sm text-red-500 text-center py-4">분류 중 오류가 발생했습니다.</p>`;
    }
}

// ─── 이슈 상세 모달 ─────────────────────────────────────
async function showAiIssueDetail(issueId) {
    const modal = document.getElementById('aiIssueModal');
    const title = document.getElementById('aiIssueModalTitle');
    const body = document.getElementById('aiIssueModalBody');

    title.textContent = `이슈 #${issueId}`;
    body.innerHTML = '<div class="text-center py-8"><i class="fas fa-spinner fa-spin text-purple-500 text-xl"></i><p class="text-sm text-gray-500 mt-2">불러오는 중...</p></div>';
    modal.classList.remove('hidden');

    try {
        const apiUrl = window.API_BASE_URL || '/api';
        const response = await fetch(`${apiUrl}/issues/${issueId}`, {
            headers: {
                'Authorization': `Bearer ${TokenManager.getToken()}`,
                'Content-Type': 'application/json'
            }
        });

        if (!response.ok) throw new Error('이슈를 불러올 수 없습니다.');
        const issue = await response.json();

        const statusMap = {
            'pending': '대기',
            'in_progress': '진행 중',
            'completed': '완료',
            'rejected': '반려'
        };

        body.innerHTML = `
            <div class="space-y-3">
                <div>
                    <span class="text-xs text-gray-500">프로젝트</span>
                    <p class="font-medium">${issue.project_name || '-'}</p>
                </div>
                <div>
                    <span class="text-xs text-gray-500">설명</span>
                    <p class="font-medium">${issue.description || '-'}</p>
                </div>
                ${issue.detail_notes ? `<div>
                    <span class="text-xs text-gray-500">상세 내용</span>
                    <p class="whitespace-pre-line">${issue.detail_notes}</p>
                </div>` : ''}
                <div class="grid grid-cols-2 gap-3">
                    <div>
                        <span class="text-xs text-gray-500">카테고리</span>
                        <p>${issue.category || '-'}</p>
                    </div>
                    <div>
                        <span class="text-xs text-gray-500">상태</span>
                        <p>${statusMap[issue.review_status] || issue.review_status || '-'}</p>
                    </div>
                    <div>
                        <span class="text-xs text-gray-500">위치</span>
                        <p>${issue.location || '-'}</p>
                    </div>
                    <div>
                        <span class="text-xs text-gray-500">담당자</span>
                        <p>${issue.assigned_to_name || issue.assignee_name || '-'}</p>
                    </div>
                </div>
                ${issue.resolution ? `<div>
                    <span class="text-xs text-gray-500">해결 방안</span>
                    <p class="whitespace-pre-line">${issue.resolution}</p>
                </div>` : ''}
                <div>
                    <span class="text-xs text-gray-500">등록일</span>
                    <p>${issue.created_at ? new Date(issue.created_at).toLocaleDateString('ko-KR') : '-'}</p>
                </div>
            </div>
        `;
    } catch (error) {
        body.innerHTML = `<p class="text-sm text-red-500 text-center py-4">이슈를 불러오는데 실패했습니다.</p>`;
    }
}

// 엔트리 포인트
function initializeAiAssistantApp() {
    console.log('AI 어시스턴트 스크립트 로드 완료');
}
initializeAiAssistantApp();