// ─── 知识库操作功能（与 app.js 配合）───

// 标签页切换（扩展支持 analysis）
var _origSwitch = kbSwitchTab;
kbSwitchTab = function(tab) {
    window._kbActiveTab = tab;
    ['wiki','datalib','profile','analysis'].forEach(function(t) {
        var tabEl = document.getElementById('kbTab' + t.charAt(0).toUpperCase() + t.slice(1));
        var paneEl = document.getElementById('kbPane' + t.charAt(0).toUpperCase() + t.slice(1));
        if (tabEl) tabEl.classList.toggle('active', t === tab);
        if (paneEl) paneEl.style.display = t === tab ? '' : 'none';
    });
    // 分析面板进入时自动加载
    if (tab === 'analysis') {
        kbRunLint();
        kbLoadContradictions();
    }
};

// ─── 新建 ───
var _kbEditingPath = null;

function kbShowCreateModal() {
    _kbEditingPath = null;
    document.getElementById('kbEditorTitle').textContent = '📝 新建文章';
    document.getElementById('kbEditorArticleTitle').value = '';
    document.getElementById('kbEditorContent').value = '';
    document.getElementById('kbEditorSaveBtn').textContent = '创建';
    kbLoadTopicSelect('kbEditorTopic');
    document.getElementById('kbEditorModal').style.display = 'flex';
}

function kbShowEditModal() {
    _kbEditingPath = document.getElementById('kbArticleTitle').textContent;
    document.getElementById('kbEditorTitle').textContent = '✏️ 编辑文章';
    document.getElementById('kbEditorSaveBtn').textContent = '保存';
    kbLoadTopicSelect('kbEditorTopic');
    
    // 加载当前内容
    fetch('/api/knowledge/article?path=' + encodeURIComponent(_kbEditingPath))
    .then(function(r) { return r.json(); })
    .then(function(res) {
        if (res.code !== 0) { alert(res.msg); return; }
        var text = res.data.content;
        // 提取标题和内容
        var lines = text.split('\n');
        var title = '';
        var content = '';
        for (var i = 0; i < lines.length; i++) {
            if (lines[i].startsWith('# ')) {
                title = lines[i].substring(2).trim();
            } else if (i > 0 || !lines[i].startsWith('# ')) {
                content += lines[i] + '\n';
            }
        }
        document.getElementById('kbEditorArticleTitle').value = title;
        document.getElementById('kbEditorContent').value = content.trim();
        // 设置主题选择
        var topic = _kbEditingPath.split('/')[0];
        var sel = document.getElementById('kbEditorTopic');
        for (var j = 0; j < sel.options.length; j++) {
            if (sel.options[j].value === topic) { sel.selectedIndex = j; break; }
        }
    });
    document.getElementById('kbEditorModal').style.display = 'flex';
}

function kbCloseEditor() {
    document.getElementById('kbEditorModal').style.display = 'none';
}

function kbSaveArticle() {
    var title = document.getElementById('kbEditorArticleTitle').value.trim();
    var content = document.getElementById('kbEditorContent').value.trim();
    if (!title) { alert('请输入标题'); return; }
    if (!content) { alert('请输入内容'); return; }
    
    var topic = _kbEditingPath ? _kbEditingPath.split('/')[0] : document.getElementById('kbEditorTopic').value;
    
    if (_kbEditingPath) {
        // 更新
        var md = '# ' + title + '\n\n' + content;
        fetch('/api/knowledge/article/update', {
            method: 'POST',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify({path: _kbEditingPath, content: md})
        })
        .then(function(r) { return r.json(); })
        .then(function(res) {
            if (res.code === 0) {
                kbCloseEditor();
                kbBackToList();
                kbLoadIndex();
            } else {
                alert(res.msg);
            }
        });
    } else {
        // 新建
        var md = '# ' + title + '\n\n' + content;
        fetch('/api/knowledge/article/create', {
            method: 'POST',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify({title: title, content: md, topic: topic})
        })
        .then(function(r) { return r.json(); })
        .then(function(res) {
            if (res.code === 0) {
                kbCloseEditor();
                kbLoadIndex();
            } else {
                alert(res.msg);
            }
        });
    }
}

function kbLoadTopicSelect(elementId) {
    fetch('/api/knowledge/topics')
    .then(function(r) { return r.json(); })
    .then(function(res) {
        if (res.code !== 0) return;
        var sel = document.getElementById(elementId);
        if (!sel) return;
        sel.innerHTML = '';
        res.data.forEach(function(t) {
            sel.innerHTML += '<option value="' + escHtml(t) + '">' + escHtml(t) + '</option>';
        });
    });
}

// ─── 删除 ───

function kbDeleteArticle() {
    var path = document.getElementById('kbArticleTitle').textContent;
    showCenteredConfirm('确认删除', '确定要删除「' + path + '」吗？此操作不可撤销。').then(function(ok) {
        if (!ok) return;
        
        fetch('/api/knowledge/article/delete', {
            method: 'POST',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify({path: path})
        })
        .then(function(r) { return r.json(); })
        .then(function(res) {
            if (res.code === 0) {
                kbBackToList();
                kbLoadIndex();
            } else {
                alert(res.msg);
            }
        });
    });
}

// ─── 导出 ───

function kbExportArticle() {
    var path = document.getElementById('kbArticleTitle').textContent;
    fetch('/api/knowledge/export?path=' + encodeURIComponent(path))
    .then(function(r) { return r.json(); })
    .then(function(res) {
        if (res.code !== 0) { alert(res.msg); return; }
        var blob = new Blob([res.data.content], {type: 'text/markdown'});
        var url = URL.createObjectURL(blob);
        var a = document.createElement('a');
        a.href = url;
        a.download = res.data.filename;
        a.click();
        URL.revokeObjectURL(url);
    });
}

// ─── 导入 ───

function kbShowImportModal() {
    kbLoadTopicSelect('kbImportTopic');
    document.getElementById('kbImportFile').value = '';
    document.getElementById('kbImportModal').style.display = 'flex';
}

function kbDoImport() {
    var topic = document.getElementById('kbImportTopic').value;
    var fileInput = document.getElementById('kbImportFile');
    if (!fileInput.files || !fileInput.files[0]) { alert('请选择文件'); return; }
    
    var formData = new FormData();
    formData.append('file', fileInput.files[0]);
    formData.append('topic', topic);
    
    fetch('/api/knowledge/import', {
        method: 'POST',
        body: formData
    })
    .then(function(r) { return r.json(); })
    .then(function(res) {
        if (res.code === 0) {
            document.getElementById('kbImportModal').style.display = 'none';
            kbSwitchTab('wiki');
            kbLoadIndex();
        } else {
            alert(res.msg);
        }
    });
}

// ─── Lint ───

function kbRunLint() {
    var el = document.getElementById('kbLintResult');
    el.innerHTML = '<div style="text-align:center;padding:20px;color:var(--text-light)">⏳ 正在检查...</div>';
    
    fetch('/api/knowledge/lint', {method: 'POST'})
    .then(function(r) { return r.json(); })
    .then(function(res) {
        if (res.code !== 0) { el.innerHTML = '❌ 检查失败'; return; }
        var data = res.data;
        var lines = (data.stdout || '').split('\n').filter(function(l) { return l.trim(); });
        var html = '<div style="margin-bottom:8px">' + (data.success ? '✅ ' : '⚠️ ') + '检查完成</div>';
        html += '<div style="font-family:monospace;font-size:12px;background:#f9f9f9;border-radius:4px;padding:8px 12px;line-height:1.6;max-height:300px;overflow-y:auto">';
        lines.forEach(function(l) { html += escHtml(l) + '<br>'; });
        html += '</div>';
        el.innerHTML = html;
    })
    .catch(function() {
        el.innerHTML = '❌ 检查出错';
    });
}

// ─── 矛盾分析 ───

function kbLoadContradictions() {
    var el = document.getElementById('kbContradictionResult');
    
    fetch('/api/knowledge/contradictions')
    .then(function(r) { return r.json(); })
    .then(function(res) {
        if (res.code !== 0 || res.count === 0) {
            el.innerHTML = '<div style="padding:10px;color:var(--text-light)">✅ 未发现明显矛盾</div>';
            return;
        }
        var html = '<div style="margin-bottom:6px;font-weight:500">找到 ' + res.count + ' 个关联主题</div>';
        res.data.forEach(function(item) {
            html += '<div style="margin-bottom:6px;padding:6px 8px;background:#fffbe6;border-radius:4px;border:1px solid #ffe58f">';
            html += '<strong>' + escHtml(item.concept) + '</strong> (' + escHtml(item.keyword) + ')<br>';
            html += '<span style="font-size:12px;color:var(--text-light)">出现在 ' + item.articles.length + ' 篇文章中：</span>';
            item.articles.forEach(function(a) {
                html += '<div style="font-size:12px;padding-left:10px">• <a href="javascript:void(0)" onclick="kbSwitchTab(\'wiki\');kbOpenArticle(\'' + escJs(a) + '\')">' + escHtml(a) + '</a></div>';
            });
            html += '</div>';
        });
        el.innerHTML = html;
    })
    .catch(function() {
        el.innerHTML = '❌ 分析失败';
    });
}

// ─── 关系图谱 ───

function kbLoadGraph() {
    var container = document.getElementById('kbGraphContainer');
    container.innerHTML = '<div style="text-align:center;padding:30px;color:var(--text-light)">⏳ 正在加载关系图谱...</div>';
    
    fetch('/api/knowledge/graph')
    .then(function(r) { return r.json(); })
    .then(function(res) {
        if (res.code !== 0) { container.innerHTML = '❌ 加载失败'; return; }
        var data = res.data;
        var nodes = (data.nodes || []).map(function(n, i) { return {id: n.id, label: n.label, topic: n.topic, x: 0, y: 0, vx: 0, vy: 0}; });
        var links = (data.edges || []).map(function(e) { return {source: e.source, target: e.target}; });
        
        if (nodes.length === 0) {
            container.innerHTML = '<div style="text-align:center;padding:30px;color:var(--text-light)">暂无数据</div>';
            return;
        }
        
        var width = container.clientWidth || 760;
        var height = 420;
        
        // 主题颜色映射
        var topicColors = {
            '采购管理': '#e74c3c', '库存管理': '#3498db', '供应链流程': '#27ae60',
            '数据分析': '#f39c12', '产品知识': '#8e44ad', '行业资讯': '#16a085'
        };
        
        container.innerHTML = '';
        
        // 构建 Canvas
        var canvas = document.createElement('canvas');
        canvas.width = width;
        canvas.height = height;
        canvas.style.cssText = 'width:' + width + 'px;height:' + height + 'px;background:#fafafa;border-radius:8px;cursor:pointer;display:block';
        container.appendChild(canvas);
        var ctx = canvas.getContext('2d');
        
        // 构建节点索引
        var nodeIndex = {};
        nodes.forEach(function(n) { nodeIndex[n.id] = n; });
        
        // 解析 links 为索引引用
        var linkData = [];
        links.forEach(function(l) {
            var s = typeof l.source === 'object' ? l.source.id : l.source;
            var t = typeof l.target === 'object' ? l.target.id : l.target;
            if (nodeIndex[s] && nodeIndex[t]) {
                linkData.push({source: nodeIndex[s], target: nodeIndex[t]});
            }
        });
        
        // 初始化位置
        var cx = width / 2, cy = height / 2;
        var angleStep = (2 * Math.PI) / nodes.length;
        nodes.forEach(function(n, i) {
            n.x = cx + Math.cos(angleStep * i) * (Math.min(width, height) * 0.3);
            n.y = cy + Math.sin(angleStep * i) * (Math.min(width, height) * 0.3);
        });
        
        // 计算每个节点的链接数
        var linkCount = {};
        nodes.forEach(function(n) { linkCount[n.id] = 0; });
        linkData.forEach(function(l) {
            linkCount[l.source.id]++;
            linkCount[l.target.id]++;
        });
        
        // 力模拟参数
        var repulsion = 800;
        var attraction = 0.01;
        var damping = 0.85;
        var minDist = 60;
        
        function simulateStep() {
            // 排斥力
            for (var i = 0; i < nodes.length; i++) {
                for (var j = i + 1; j < nodes.length; j++) {
                    var a = nodes[i], b = nodes[j];
                    var dx = a.x - b.x;
                    var dy = a.y - b.y;
                    var dist = Math.sqrt(dx * dx + dy * dy) || 1;
                    var force = repulsion / (dist * dist);
                    var fx = (dx / dist) * force;
                    var fy = (dy / dist) * force;
                    a.vx += fx; a.vy += fy;
                    b.vx -= fx; b.vy -= fy;
                }
            }
            
            // 吸引力（边）
            linkData.forEach(function(l) {
                var dx = l.target.x - l.source.x;
                var dy = l.target.y - l.source.y;
                var dist = Math.sqrt(dx * dx + dy * dy) || 1;
                var force = (dist - 120) * attraction;
                var fx = (dx / dist) * force;
                var fy = (dy / dist) * force;
                l.source.vx += fx; l.source.vy += fy;
                l.target.vx -= fx; l.target.vy -= fy;
            });
            
            // 中心吸引力
            nodes.forEach(function(n) {
                n.vx += (cx - n.x) * 0.005;
                n.vy += (cy - n.y) * 0.005;
            });
            
            // 碰撞检测
            for (var i = 0; i < nodes.length; i++) {
                for (var j = i + 1; j < nodes.length; j++) {
                    var a = nodes[i], b = nodes[j];
                    var dx = a.x - b.x;
                    var dy = a.y - b.y;
                    var dist = Math.sqrt(dx * dx + dy * dy) || 1;
                    if (dist < minDist) {
                        var overlap = (minDist - dist) / 2;
                        var fx = (dx / dist) * overlap;
                        var fy = (dy / dist) * overlap;
                        a.x += fx; a.y += fy;
                        b.x -= fx; b.y -= fy;
                    }
                }
            }
            
            // 应用速度和阻尼
            nodes.forEach(function(n) {
                n.vx *= damping;
                n.vy *= damping;
                n.x += n.vx;
                n.y += n.vy;
                // 边界约束
                n.x = Math.max(30, Math.min(width - 30, n.x));
                n.y = Math.max(30, Math.min(height - 30, n.y));
            });
        }
        
        // 模拟 200 步
        for (var step = 0; step < 200; step++) {
            simulateStep();
        }
        
        // 渲染
        function render() {
            ctx.clearRect(0, 0, width, height);
            
            // 画边
            ctx.strokeStyle = 'rgba(150,150,150,0.4)';
            ctx.lineWidth = 1.5;
            linkData.forEach(function(l) {
                ctx.beginPath();
                ctx.moveTo(l.source.x, l.source.y);
                ctx.lineTo(l.target.x, l.target.y);
                ctx.stroke();
            });
            
            // 画节点
            nodes.forEach(function(n) {
                var cnt = linkCount[n.id] || 0;
                ctx.beginPath();
                ctx.arc(n.x, n.y, cnt > 2 ? 14 : 10, 0, Math.PI * 2);
                ctx.fillStyle = topicColors[n.topic] || '#95a5a6';
                ctx.fill();
                ctx.strokeStyle = '#fff';
                ctx.lineWidth = 2;
                ctx.stroke();
                
                // 标签
                ctx.fillStyle = '#333';
                ctx.font = '11px -apple-system, sans-serif';
                ctx.textAlign = 'left';
                ctx.textBaseline = 'middle';
                var label = n.label.length > 8 ? n.label.substring(0, 8) + '..' : n.label;
                ctx.fillText(label, n.x + 16, n.y);
                
                // 链接数
                ctx.fillStyle = 'rgba(0,0,0,0.35)';
                ctx.font = '9px sans-serif';
                ctx.textAlign = 'center';
                ctx.textBaseline = 'middle';
                ctx.fillText(linkCount[n.id], n.x, n.y);
            });
        }
        
        render();
        
        // 鼠标交互
        var dragTarget = null;
        var dragOffsetX = 0, dragOffsetY = 0;
        
        canvas.addEventListener('mousedown', function(e) {
            var rect = canvas.getBoundingClientRect();
            var mx = e.clientX - rect.left;
            var my = e.clientY - rect.top;
            
            for (var i = nodes.length - 1; i >= 0; i--) {
                var n = nodes[i];
                var cnt = linkCount[n.id] || 0; var r = cnt > 2 ? 14 : 10;
                var dx = mx - n.x, dy = my - n.y;
                if (dx * dx + dy * dy < r * r + 10) {
                    dragTarget = n;
                    dragOffsetX = mx - n.x;
                    dragOffsetY = my - n.y;
                    return;
                }
            }
        });
        
        canvas.addEventListener('mousemove', function(e) {
            if (!dragTarget) return;
            var rect = canvas.getBoundingClientRect();
            dragTarget.x = e.clientX - rect.left - dragOffsetX;
            dragTarget.y = e.clientY - rect.top - dragOffsetY;
            render();
        });
        
        canvas.addEventListener('mouseup', function(e) {
            if (!dragTarget) {
                // 点击节点跳转
                var rect = canvas.getBoundingClientRect();
                var mx = e.clientX - rect.left;
                var my = e.clientY - rect.top;
                for (var i = nodes.length - 1; i >= 0; i--) {
                    var n = nodes[i];
                    var cnt = linkCount[n.id] || 0; var r = cnt > 2 ? 14 : 10;
                    var dx = mx - n.x, dy = my - n.y;
                    if (dx * dx + dy * dy < r * r + 10) {
                        kbSwitchTab('wiki');
                        kbOpenArticle(n.id);
                        return;
                    }
                }
            }
            dragTarget = null;
            // 释放后再模拟几步
            for (var i = 0; i < 50; i++) simulateStep();
            render();
        });
        
        // 图例
        var legendDiv = document.createElement('div');
        legendDiv.style.cssText = 'display:flex;gap:14px;padding:8px 14px;font-size:12px;flex-wrap:wrap';
        for (var t in topicColors) {
            var has = nodes.some(function(n) { return n.topic === t; });
            if (has) {
                var item = document.createElement('div');
                item.style.cssText = 'display:flex;align-items:center;gap:4px';
                item.innerHTML = '<span style="display:inline-block;width:10px;height:10px;border-radius:50%;background:' + topicColors[t] + '"></span> ' + t;
                legendDiv.appendChild(item);
            }
        }
        var tip = document.createElement('div');
        tip.style.cssText = 'color:#999;margin-left:auto';
        tip.textContent = '🖱️ 拖拽移动 · 点击打开文章';
        legendDiv.appendChild(tip);
        container.appendChild(legendDiv);
    })
    .catch(function(err) {
        console.error('Graph error:', err);
        container.innerHTML = '<div style="padding:30px;text-align:center;color:var(--danger)">❌ 加载失败: ' + (err.message || '未知错误') + '</div>';
    });
}