// InsightFlow Frontend - Phase 2 (Interactive Workbench)
const API_BASE = '/api/v1';

let currentProject = null;
let currentData = null;
let selectedEntity = null;
let projectRelations = [];
let projectEntities = [];
let currentTranscript = null;
let editMode = false;
let contextMenuTarget = null;

// Init
document.addEventListener('DOMContentLoaded', () => {
    const isWorkbench = window.location.pathname.includes('workbench');
    if (isWorkbench) {
        initWorkbench();
    }
});

// Initialize workbench
async function initWorkbench() {
    const projectId = localStorage.getItem('currentProject');
    if (!projectId) {
        window.location.href = '/';
        return;
    }
    
    try {
        const projects = await fetchProjects();
        currentProject = projects.find(p => p.id === projectId);
        
        if (!currentProject) {
            localStorage.removeItem('currentProject');
            window.location.href = '/';
            return;
        }
        
        const nameEl = document.getElementById('projectName');
        if (nameEl) nameEl.textContent = currentProject.name;
        
        initUpload();
        initContextMenu();
        initTextSelection();
        await loadProjectData();
        
    } catch (err) {
        console.error('Init failed:', err);
        alert('加载失败，请返回项目列表');
    }
}

// API Calls
async function fetchProjects() {
    const res = await fetch(`${API_BASE}/projects`);
    if (!res.ok) throw new Error('Failed to fetch projects');
    return await res.json();
}

async function uploadAudio(file) {
    const formData = new FormData();
    formData.append('file', file);
    
    const res = await fetch(`${API_BASE}/projects/${currentProject.id}/upload`, {
        method: 'POST',
        body: formData
    });
    
    if (!res.ok) throw new Error('Upload failed');
    return await res.json();
}

// Phase 2: Entity Edit API
async function updateEntity(entityId, data) {
    const res = await fetch(`${API_BASE}/entities/${entityId}`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data)
    });
    if (!res.ok) throw new Error('Failed to update entity');
    return await res.json();
}

async function deleteEntityApi(entityId) {
    const res = await fetch(`${API_BASE}/entities/${entityId}`, {
        method: 'DELETE'
    });
    if (!res.ok) throw new Error('Failed to delete entity');
    return await res.json();
}

async function mergeEntitiesApi(sourceId, targetId) {
    const res = await fetch(`${API_BASE}/entities/${sourceId}/merge`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ source_entity_id: sourceId, target_entity_id: targetId })
    });
    if (!res.ok) throw new Error('Failed to merge entities');
    return await res.json();
}

async function createEntityApi(data) {
    const res = await fetch(`${API_BASE}/projects/${currentProject.id}/entities`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data)
    });
    if (!res.ok) throw new Error('Failed to create entity');
    return await res.json();
}

// Phase 2: Relation API
async function createRelationApi(data) {
    const res = await fetch(`${API_BASE}/projects/${currentProject.id}/relations`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data)
    });
    if (!res.ok) throw new Error('Failed to create relation');
    return await res.json();
}

async function deleteRelationApi(relationId) {
    const res = await fetch(`${API_BASE}/relations/${relationId}`, {
        method: 'DELETE'
    });
    if (!res.ok) throw new Error('Failed to delete relation');
    return await res.json();
}

// Phase 2: Transcript API
async function getTranscript(transcriptId) {
    const res = await fetch(`${API_BASE}/transcripts/${transcriptId}`);
    if (!res.ok) throw new Error('Failed to get transcript');
    return await res.json();
}

async function updateTranscript(transcriptId, fullText) {
    const res = await fetch(`${API_BASE}/transcripts/${transcriptId}`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ full_text: fullText })
    });
    if (!res.ok) throw new Error('Failed to update transcript');
    return await res.json();
}

async function loadProjectData() {
    try {
        // 并行加载实体和关系
        const [entitiesRes, relationsRes, transcriptsRes] = await Promise.all([
            fetch(`${API_BASE}/projects/${currentProject.id}/entities`),
            fetch(`${API_BASE}/projects/${currentProject.id}/relations`),
            fetch(`${API_BASE}/projects/${currentProject.id}/transcripts`)
        ]);
        
        if (entitiesRes.ok) {
            projectEntities = await entitiesRes.json();
        }
        if (relationsRes.ok) {
            projectRelations = await relationsRes.json();
        }
        
        // 加载最新的转录
        if (transcriptsRes.ok) {
            const transcripts = await transcriptsRes.json();
            if (transcripts.length > 0) {
                currentTranscript = await getTranscript(transcripts[0].id);
                currentData = {
                    transcript_id: currentTranscript.id,
                    project_id: currentProject.id,
                    segments: [{ speaker: '全文', text: currentTranscript.full_text }],
                    entities: projectEntities,
                    full_text: currentTranscript.full_text,
                    created_at: currentTranscript.created_at
                };
                renderTranscript();
            }
        }
        
        renderGraph();
        renderEntityList();
        
    } catch (err) {
        console.error('Load project data failed:', err);
    }
}

// Phase 2: Transcript Edit Mode
window.toggleEditMode = function() {
    editMode = !editMode;
    const editBtn = document.getElementById('editBtn');
    const saveBtn = document.getElementById('saveBtn');
    const content = document.getElementById('transcriptContent');
    
    if (editMode) {
        editBtn.style.display = 'none';
        saveBtn.style.display = 'inline-block';
        content.contentEditable = 'true';
        content.style.background = '#0f0f0f';
        content.style.border = '1px solid #00d4ff';
        content.focus();
    } else {
        editBtn.style.display = 'inline-block';
        saveBtn.style.display = 'none';
        content.contentEditable = 'false';
        content.style.background = '';
        content.style.border = '';
    }
};

window.saveTranscript = async function() {
    if (!currentTranscript) return;
    
    const content = document.getElementById('transcriptContent');
    const fullText = content.innerText;
    
    try {
        await updateTranscript(currentTranscript.id, fullText);
        currentTranscript.full_text = fullText;
        toggleEditMode();
        alert('转录文本已保存');
    } catch (err) {
        console.error('Save failed:', err);
        alert('保存失败: ' + err.message);
    }
};

// Render transcript with entity highlighting
function renderTranscript() {
    const container = document.getElementById('transcriptContent');
    if (!container || !currentData) return;
    
    container.innerHTML = '';
    
    if (editMode) {
        container.innerText = currentData.full_text || '';
        return;
    }
    
    // 高亮实体
    let text = currentData.full_text || '';
    const entities = findEntitiesInText(text);
    
    // 按位置倒序替换，避免位置偏移
    entities.sort((a, b) => b.start - a.start);
    
    entities.forEach(ent => {
        const before = text.slice(0, ent.start);
        const name = text.slice(ent.start, ent.end);
        const after = text.slice(ent.end);
        text = before + `<span class="entity" data-id="${ent.id}" onclick="window.selectEntity('${ent.id}')">${name}</span>` + after;
    });
    
    const div = document.createElement('div');
    div.className = 'segment';
    div.innerHTML = `
        <div class="speaker">转录文本</div>
        <div class="segment-text">${text}</div>
    `;
    
    container.appendChild(div);
}

// 在文本中查找实体位置
function findEntitiesInText(text) {
    if (!projectEntities || projectEntities.length === 0) return [];
    
    const found = [];
    projectEntities.forEach(ent => {
        const name = ent.name;
        let pos = 0;
        while ((pos = text.indexOf(name, pos)) !== -1) {
            found.push({
                id: ent.id,
                name: ent.name,
                start: pos,
                end: pos + name.length
            });
            pos += 1;
        }
        
        // 也检查别名
        if (ent.aliases && ent.aliases.length > 0) {
            ent.aliases.forEach(alias => {
                let aliasPos = 0;
                while ((aliasPos = text.indexOf(alias, aliasPos)) !== -1) {
                    found.push({
                        id: ent.id,
                        name: alias,
                        start: aliasPos,
                        end: aliasPos + alias.length
                    });
                    aliasPos += 1;
                }
            });
        }
    });
    
    return found;
}

// Render D3 graph with relations
function renderGraph() {
    const svg = d3.select('#graph-svg');
    svg.selectAll('*').remove();
    
    if (!projectEntities || projectEntities.length === 0) {
        svg.append('text')
            .attr('x', '50%')
            .attr('y', '50%')
            .attr('text-anchor', 'middle')
            .attr('fill', '#666')
            .text('暂无实体数据，请上传音频');
        return;
    }
    
    const container = svg.node().parentElement;
    const width = container.clientWidth;
    const height = container.clientHeight - 200;
    
    svg.attr('width', width).attr('height', height);
    
    const nodes = projectEntities.map(e => ({
        id: e.id,
        name: e.name,
        type: e.type,
        definition: e.definition,
        ...e
    }));
    
    // 使用数据库中的关系
    const links = projectRelations.map(r => ({
        id: r.id,
        source: r.source_id,
        target: r.target_id,
        type: r.type
    })).filter(r => r.source && r.target);
    
    // 如果没有关系，创建默认连接
    if (links.length === 0 && nodes.length > 1) {
        for (let i = 0; i < Math.min(nodes.length - 1, 5); i++) {
            links.push({ source: nodes[0].id, target: nodes[i + 1].id, type: 'related' });
        }
    }
    
    const colorMap = {
        'PROJECT': '#7b2cbf',
        'TECH': '#00d4ff',
        'PERSON': '#ff6b6b',
        'ORG': '#4ecdc4',
        'OTHER': '#666'
    };
    
    const simulation = d3.forceSimulation(nodes)
        .force('link', d3.forceLink(links).id(d => d.id).distance(120))
        .force('charge', d3.forceManyBody().strength(-400))
        .force('center', d3.forceCenter(width / 2, height / 2))
        .force('collision', d3.forceCollide().radius(50));
    
    // 关系连线
    const link = svg.append('g')
        .selectAll('line')
        .data(links)
        .enter().append('line')
        .attr('stroke', '#444')
        .attr('stroke-width', 1.5)
        .attr('stroke-opacity', 0.6);
    
    // 关系标签
    const linkLabel = svg.append('g')
        .selectAll('text')
        .data(links)
        .enter().append('text')
        .attr('font-size', '10px')
        .attr('fill', '#666')
        .attr('text-anchor', 'middle')
        .text(d => d.type);
    
    // 节点组
    const node = svg.append('g')
        .selectAll('g')
        .data(nodes)
        .enter().append('g')
        .attr('class', 'node')
        .call(d3.drag()
            .on('start', dragstarted)
            .on('drag', dragged)
            .on('end', dragended))
        .on('click', (e, d) => window.selectEntity(d.id))
        .on('contextmenu', (e, d) => {
            e.preventDefault();
            showContextMenu(e, d.id);
        });
    
    // 节点圆圈
    node.append('circle')
        .attr('r', 35)
        .attr('fill', d => colorMap[d.type] || '#666')
        .attr('stroke', '#fff')
        .attr('stroke-width', 2)
        .attr('class', 'node-circle');
    
    // 节点文字
    node.append('text')
        .text(d => d.name.length > 6 ? d.name.slice(0, 5) + '...' : d.name)
        .attr('text-anchor', 'middle')
        .attr('dy', 5)
        .attr('fill', '#fff')
        .attr('font-size', '11px')
        .attr('font-weight', '500');
    
    // 节点类型图标
    node.append('text')
        .attr('dy', -45)
        .attr('text-anchor', 'middle')
        .attr('fill', d => colorMap[d.type] || '#666')
        .attr('font-size', '10px')
        .text(d => d.type);
    
    simulation.on('tick', () => {
        link
            .attr('x1', d => d.source.x)
            .attr('y1', d => d.source.y)
            .attr('x2', d => d.target.x)
            .attr('y2', d => d.target.y);
        
        linkLabel
            .attr('x', d => (d.source.x + d.target.x) / 2)
            .attr('y', d => (d.source.y + d.target.y) / 2);
        
        node.attr('transform', d => `translate(${d.x},${d.y})`);
    });
    
    function dragstarted(e, d) {
        if (!e.active) simulation.alphaTarget(0.3).restart();
        d.fx = d.x;
        d.fy = d.y;
    }
    
    function dragged(e, d) {
        d.fx = e.x;
        d.fy = e.y;
    }
    
    function dragended(e, d) {
        if (!e.active) simulation.alphaTarget(0);
        d.fx = null;
        d.fy = null;
    }
}

// Render entity list
function renderEntityList() {
    const container = document.getElementById('entityList');
    if (!container) return;
    
    container.innerHTML = '<h3 style="margin-bottom:12px;color:#888;font-size:0.9rem;">项目实体</h3>';
    
    if (!projectEntities || projectEntities.length === 0) {
        container.innerHTML += '<p style="color:#666;font-size:0.85rem;">暂无实体，请上传音频文件</p>';
        return;
    }
    
    projectEntities.forEach(ent => {
        const div = document.createElement('div');
        div.className = 'entity-item';
        div.dataset.id = ent.id;
        div.onclick = () => window.selectEntity(ent.id);
        div.oncontextmenu = (e) => {
            e.preventDefault();
            showContextMenu(e, ent.id);
        };
        
        div.innerHTML = `
            <span class="entity-type-badge type-${ent.type}">${ent.type}</span>
            <div>
                <div style="font-weight:500;">${ent.name}</div>
                <div style="font-size:0.8rem;color:#666;">${ent.definition || '暂无定义'}</div>
            </div>
        `;
        
        container.appendChild(div);
    });
}

// Select entity - 联动高亮
window.selectEntity = function(entityId) {
    selectedEntity = entityId;
    const entity = projectEntities.find(e => e.id === entityId);
    if (!entity) return;
    
    // 高亮文本中的实体
    document.querySelectorAll('.entity').forEach(el => {
        if (el.dataset.id === entityId) {
            el.classList.add('selected');
        } else {
            el.classList.remove('selected');
        }
    });
    
    // 高亮图谱中的节点
    d3.selectAll('.node-circle')
        .attr('stroke', d => d.id === entityId ? '#ff6b6b' : '#fff')
        .attr('stroke-width', d => d.id === entityId ? 4 : 2)
        .attr('r', d => d.id === entityId ? 40 : 35);
    
    // 高亮实体列表
    document.querySelectorAll('.entity-item').forEach(el => {
        if (el.dataset.id === entityId) {
            el.classList.add('selected');
        } else {
            el.classList.remove('selected');
        }
    });
    
    console.log('Selected:', entity.name, entity.definition);
};

// Phase 2: Context Menu
function initContextMenu() {
    document.addEventListener('click', () => {
        hideContextMenu();
    });
}

function showContextMenu(e, entityId) {
    contextMenuTarget = entityId;
    const menu = document.getElementById('contextMenu');
    menu.style.left = e.pageX + 'px';
    menu.style.top = e.pageY + 'px';
    menu.classList.add('show');
}

function hideContextMenu() {
    const menu = document.getElementById('contextMenu');
    menu.classList.remove('show');
    contextMenuTarget = null;
}

// Phase 2: Entity Editor Modal
window.editEntity = function() {
    hideContextMenu();
    if (!contextMenuTarget && !selectedEntity) return;
    
    const entityId = contextMenuTarget || selectedEntity;
    const entity = projectEntities.find(e => e.id === entityId);
    if (!entity) return;
    
    document.getElementById('entityName').value = entity.name;
    document.getElementById('entityType').value = entity.type;
    document.getElementById('entityDefinition').value = entity.definition || '';
    document.getElementById('entityAliases').value = (entity.aliases || []).join(', ');
    
    // 显示关系编辑器
    document.getElementById('relationEditor').style.display = 'block';
    renderRelationList(entityId);
    
    document.getElementById('entityModal').dataset.entityId = entityId;
    document.getElementById('entityModal').classList.add('show');
};

function renderRelationList(entityId) {
    const container = document.getElementById('relationList');
    const entityRelations = projectRelations.filter(r => 
        r.source_id === entityId || r.target_id === entityId
    );
    
    if (entityRelations.length === 0) {
        container.innerHTML = '<p style="color:#666;font-size:0.8rem;">暂无关系</p>';
        return;
    }
    
    container.innerHTML = entityRelations.map(r => {
        const isSource = r.source_id === entityId;
        const otherId = isSource ? r.target_id : r.source_id;
        const other = projectEntities.find(e => e.id === otherId);
        const otherName = other ? other.name : 'Unknown';
        const arrow = isSource ? '→' : '←';
        
        return `
            <div class="relation-item">
                <span>${arrow} ${otherName} (${r.type})</span>
                <button onclick="deleteRelation('${r.id}')">删除</button>
            </div>
        `;
    }).join('');
}

window.hideEntityModal = function() {
    document.getElementById('entityModal').classList.remove('show');
};

window.saveEntity = async function() {
    const entityId = document.getElementById('entityModal').dataset.entityId;
    if (!entityId) return;
    
    const data = {
        name: document.getElementById('entityName').value,
        type: document.getElementById('entityType').value,
        definition: document.getElementById('entityDefinition').value,
        aliases: document.getElementById('entityAliases').value.split(',').map(s => s.trim()).filter(s => s)
    };
    
    try {
        await updateEntity(entityId, data);
        await loadProjectData();
        hideEntityModal();
    } catch (err) {
        console.error('Save failed:', err);
        alert('保存失败: ' + err.message);
    }
};

window.deleteEntity = async function() {
    const entityId = document.getElementById('entityModal').dataset.entityId;
    if (!entityId) return;
    
    if (!confirm('确定要删除这个实体吗？相关的提及和关系也会被删除。')) return;
    
    try {
        await deleteEntityApi(entityId);
        await loadProjectData();
        hideEntityModal();
    } catch (err) {
        console.error('Delete failed:', err);
        alert('删除失败: ' + err.message);
    }
};

// Phase 2: Merge Modal
window.showMergeModal = function() {
    hideContextMenu();
    if (!contextMenuTarget && !selectedEntity) return;
    
    const sourceId = contextMenuTarget || selectedEntity;
    const source = projectEntities.find(e => e.id === sourceId);
    if (!source) return;
    
    document.getElementById('mergeSource').value = source.name;
    document.getElementById('mergeModal').dataset.sourceId = sourceId;
    
    // 填充目标实体选项（排除自己）
    const select = document.getElementById('mergeTarget');
    select.innerHTML = projectEntities
        .filter(e => e.id !== sourceId)
        .map(e => `<option value="${e.id}">${e.name} (${e.type})</option>`)
        .join('');
    
    document.getElementById('mergeModal').classList.add('show');
};

window.hideMergeModal = function() {
    document.getElementById('mergeModal').classList.remove('show');
};

window.confirmMerge = async function() {
    const sourceId = document.getElementById('mergeModal').dataset.sourceId;
    const targetId = document.getElementById('mergeTarget').value;
    
    if (!sourceId || !targetId) return;
    
    try {
        await mergeEntitiesApi(sourceId, targetId);
        await loadProjectData();
        hideMergeModal();
    } catch (err) {
        console.error('Merge failed:', err);
        alert('合并失败: ' + err.message);
    }
};

// Phase 2: Relation Modal
window.showAddRelation = function() {
    const entityId = document.getElementById('entityModal').dataset.entityId;
    if (!entityId) return;
    
    const entity = projectEntities.find(e => e.id === entityId);
    document.getElementById('relationModal').dataset.sourceId = entityId;
    
    // 填充目标选项
    const select = document.getElementById('relationTarget');
    select.innerHTML = projectEntities
        .filter(e => e.id !== entityId)
        .map(e => `<option value="${e.id}">${e.name}</option>`)
        .join('');
    
    document.getElementById('relationModal').classList.add('show');
};

window.hideRelationModal = function() {
    document.getElementById('relationModal').classList.remove('show');
};

window.saveRelation = async function() {
    const sourceId = document.getElementById('relationModal').dataset.sourceId;
    const targetId = document.getElementById('relationTarget').value;
    const type = document.getElementById('relationType').value;
    const evidence = document.getElementById('relationEvidence').value;
    
    if (!sourceId || !targetId) return;
    
    try {
        await createRelationApi({
            source_entity_id: sourceId,
            target_entity_id: targetId,
            relation_type: type,
            evidence: evidence
        });
        await loadProjectData();
        renderRelationList(sourceId);
        hideRelationModal();
    } catch (err) {
        console.error('Create relation failed:', err);
        alert('创建关系失败: ' + err.message);
    }
};

window.deleteRelation = async function(relationId) {
    if (!confirm('确定要删除这个关系吗？')) return;
    
    try {
        await deleteRelationApi(relationId);
        await loadProjectData();
        const entityId = document.getElementById('entityModal').dataset.entityId;
        if (entityId) renderRelationList(entityId);
    } catch (err) {
        console.error('Delete relation failed:', err);
        alert('删除关系失败: ' + err.message);
    }
};

// Phase 2: Text Selection - Create Entity
function initTextSelection() {
    document.addEventListener('selectionchange', () => {
        const selection = window.getSelection();
        const text = selection.toString().trim();
        
        if (text.length > 0 && text.length < 50) {
            showSelectionToolbar();
        } else {
            hideSelectionToolbar();
        }
    });
}

function showSelectionToolbar() {
    document.getElementById('selectionToolbar').classList.add('show');
}

window.hideSelectionToolbar = function() {
    document.getElementById('selectionToolbar').classList.remove('show');
    window.getSelection().removeAllRanges();
};

window.createEntityFromSelection = async function() {
    const selection = window.getSelection();
    const text = selection.toString().trim();
    
    if (!text) return;
    
    // 获取选中文本在全文中的位置
    const container = document.getElementById('transcriptContent');
    const fullText = currentTranscript ? currentTranscript.full_text : '';
    const startPos = fullText.indexOf(text);
    
    try {
        const result = await createEntityApi({
            name: text,
            type: 'OTHER',
            definition: '',
            transcript_id: currentTranscript ? currentTranscript.id : null,
            start_pos: startPos >= 0 ? startPos : null,
            end_pos: startPos >= 0 ? startPos + text.length : null
        });
        
        hideSelectionToolbar();
        await loadProjectData();
        
        if (!result.existed) {
            alert(`已创建实体: ${text}`);
        } else {
            alert(`实体 "${text}" 已存在`);
        }
    } catch (err) {
        console.error('Create entity failed:', err);
        alert('创建实体失败: ' + err.message);
    }
};

// Show/hide upload
window.showUpload = function() {
    const el = document.getElementById('uploadOverlay');
    if (el) el.classList.add('show');
};

window.hideUpload = function() {
    const el = document.getElementById('uploadOverlay');
    if (el) el.classList.remove('show');
};

// Upload handling
function initUpload() {
    const input = document.getElementById('fileInput');
    const overlay = document.getElementById('uploadOverlay');
    
    if (!input) return;
    
    input.addEventListener('change', async (e) => {
        if (!e.target.files.length) return;
        
        const file = e.target.files[0];
        if (overlay) {
            overlay.innerHTML = `
                <div style="text-align:center;">
                    <h2>正在分析...</h2>
                    <p style="color:#666;margin-top:10px;">${file.name}</p>
                    <p style="color:#888;margin-top:20px;font-size:0.9rem;">ASR转录 + 实体提取中</p>
                </div>
            `;
        }
        
        try {
            const result = await uploadAudio(file);
            
            // 更新当前数据
            currentData = result;
            
            // 重新加载项目数据
            await loadProjectData();
            
            if (overlay) overlay.classList.remove('show');
            
        } catch (err) {
            console.error('Upload failed:', err);
            if (overlay) {
                overlay.innerHTML = `
                    <div style="text-align:center;">
                        <h2 style="color:#ff6b6b;">分析失败</h2>
                        <p style="color:#666;margin-top:10px;">${err.message}</p>
                        <button class="btn" onclick="location.reload()" style="margin-top:20px;">重试</button>
                    </div>
                `;
            }
        }
    });
}