//! Compliance Report Generation
//!
//! Generates comprehensive compliance reports across multiple frameworks.

use std::collections::HashMap;

use super::{ComplianceFramework, ComplianceResult};
use crate::error::{policy, ControlCenterError, Result};

/// Compliance report generator
pub struct ComplianceReportGenerator;

impl ComplianceReportGenerator {
    /// Generate comprehensive compliance report
    pub fn generate_comprehensive_report(
        results: &HashMap<ComplianceFramework, ComplianceResult>,
        format: &str,
    ) -> Result<String> {
        match format.to_lowercase().as_str() {
            "json" => Self::generate_json_report(results),
            "html" => Self::generate_html_report(results),
            "pdf" => Self::generate_pdf_report(results),
            _ => Err(ControlCenterError::Policy(policy::PolicyError::Compliance(
                format!("Unsupported report format: {}", format),
            ))),
        }
    }

    /// Generate JSON report
    fn generate_json_report(
        results: &HashMap<ComplianceFramework, ComplianceResult>,
    ) -> Result<String> {
        Ok(serde_json::to_string_pretty(results)?)
    }

    /// Generate HTML report
    fn generate_html_report(
        results: &HashMap<ComplianceFramework, ComplianceResult>,
    ) -> Result<String> {
        let mut html = String::new();
        html.push_str(
            "<!DOCTYPE html>\n<html>\n<head>\n<title>Compliance Report</title>\n</head>\n<body>\n",
        );
        html.push_str("<h1>Multi-Framework Compliance Report</h1>\n");

        for (framework, result) in results {
            html.push_str(&format!("<h2>{:?} Compliance</h2>\n", framework));
            html.push_str(&format!(
                "<p>Status: {}</p>\n",
                if result.overall_compliant {
                    "✓ COMPLIANT"
                } else {
                    "✗ NON-COMPLIANT"
                }
            ));
            html.push_str(&format!("<p>Score: {:.1}%</p>\n", result.score));
        }

        html.push_str("</body>\n</html>");
        Ok(html)
    }

    /// Generate PDF report (placeholder)
    fn generate_pdf_report(
        _results: &HashMap<ComplianceFramework, ComplianceResult>,
    ) -> Result<String> {
        // In a real implementation, this would generate an actual PDF
        Ok("PDF generation not implemented yet".to_string())
    }
}
