import { useState } from 'react';
import axios from 'axios';

const API = '';

const SEVERITY_COLORS = {
    Critical: 'var(--critical)',
    High: 'var(--high)',
    Medium: 'var(--medium)',
    Low: 'var(--low)',
};

export default function ReportPanel({ clusters, anomalies, stats }) {
    const [report, setReport] = useState(null);
    const [loading, setLoading] = useState(false);
    const [error, setError] = useState(null);

    async function generateReport() {
        setLoading(true);
        setError(null);
        try {
            const response = await axios.post(`/api/cluster/report`, {
                clusters, anomalies, stats
            });
            setReport(response.data);
        } catch (err) {
            setError('Failed to generate report');
        } finally {
            setLoading(false);
        }
    }

    function downloadMarkdown() {
        if (!report) return;
        const md = buildMarkdown(report);
        const blob = new Blob([md], { type: 'text/markdown' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = 'incident-report.md';
        a.click();
        URL.revokeObjectURL(url);
    }

    function buildMarkdown(r) {
        return `# Incident Report

## Executive Summary
${r.executive_summary}

**Overall Severity:** ${r.overall_severity}
**Affected Systems:** ${r.estimated_affected_systems?.join(', ') || 'Unknown'}

## Top Issues
${r.top_issues?.map(issue => `
### ${issue.rank}. ${issue.label} — ${issue.severity}
- **Impact:** ${issue.impact}
- **Suggested Fix:** ${issue.suggested_fix}
`).join('\n')}

## Anomaly Assessment
${r.anomaly_assessment}

---
*Generated by Error Clustering Engine*
`;
    }

    return (
        <div className="panel fade-in">
            <div className="panel-header">
                <span className="panel-title">ROOT CAUSE REPORT</span>
                <div className="panel-actions">
                    {report && (
                        <button className="btn-ghost" onClick={downloadMarkdown}>
                            Download .md
                        </button>
                    )}
                    <button
                        className="btn-primary"
                        onClick={generateReport}
                        disabled={loading}
                    >
                        {loading ? 'Generating...' : report ? 'Regenerate' : 'Generate Report'}
                    </button>
                </div>
            </div>

            {error && (
                <div style={{ padding: '12px 16px', color: 'var(--critical)', fontFamily: 'var(--font-mono)', fontSize: 12 }}>
                    ⚠ {error}
                </div>
            )}

            {loading && (
                <div style={{ padding: '16px', color: 'var(--text-dim)', fontFamily: 'var(--font-mono)', fontSize: 12 }}>
                    Analyzing clusters and generating report...
                </div>
            )}

            {report && !loading && (
                <div className="report-body">
                    {/* Header */}
                    <div className="report-section">
                        <div className="report-meta">
                            <span
                                className="severity-badge"
                                style={{ color: SEVERITY_COLORS[report.overall_severity] }}
                            >
                                {report.overall_severity?.toUpperCase()} SEVERITY
                            </span>
                            {report.estimated_affected_systems?.length > 0 && (
                                <div className="formats-list" style={{ marginTop: 8 }}>
                                    {report.estimated_affected_systems.map(s => (
                                        <div key={s} className="format-badge">
                                            <span className="format-name">{s}</span>
                                        </div>
                                    ))}
                                </div>
                            )}
                        </div>
                        <p className="report-summary">{report.executive_summary}</p>
                    </div>

                    {/* Top issues */}
                    <div className="report-section">
                        <div className="report-section-title">TOP ISSUES</div>
                        {report.top_issues?.map(issue => (
                            <div key={issue.rank} className="report-issue">
                                <div className="report-issue-header">
                                    <span className="report-rank">#{issue.rank}</span>
                                    <span className="report-issue-label">{issue.label}</span>
                                    <span
                                        className="severity-badge"
                                        style={{ color: SEVERITY_COLORS[issue.severity], marginLeft: 'auto' }}
                                    >
                                        {issue.severity?.toUpperCase()}
                                    </span>
                                </div>
                                <div className="report-issue-detail">
                                    <span style={{ color: 'var(--text-dim)' }}>Impact: </span>
                                    {issue.impact}
                                </div>
                                <div className="report-issue-detail">
                                    <span style={{ color: 'var(--text-dim)' }}>Fix: </span>
                                    {issue.suggested_fix}
                                </div>
                            </div>
                        ))}
                    </div>

                    {/* Anomalies */}
                    {report.anomaly_assessment && (
                        <div className="report-section">
                            <div className="report-section-title">ANOMALY ASSESSMENT</div>
                            <p style={{ color: 'var(--text-mid)', fontSize: 13 }}>
                                {report.anomaly_assessment}
                            </p>
                        </div>
                    )}
                </div>
            )}

            {!report && !loading && (
                <div style={{
                    padding: '24px 16px',
                    color: 'var(--text-dim)',
                    fontFamily: 'var(--font-mono)',
                    fontSize: 12,
                    textAlign: 'center'
                }}>
                    Click "Generate Report" to get an AI-powered incident analysis
                </div>
            )}
        </div>
    );
}