use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;

pub mod access_review;
pub mod audit;
pub mod code_scanner;
pub mod policy_checker;
pub mod risk_assessment;
pub mod training_tracker;

pub use code_scanner::{
    CodeIssue, CodeScanner, ComplianceReporter, ComplianceScanResult, IssueSeverity, IssueType,
    ScanStats,
};

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum ComplianceFramework {
    GDPR,
    SOC2,
    ISO27001,
    HIPAA,
    PCIDSS,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum ComplianceStatus {
    Compliant,
    PartialCompliance,
    NonCompliant,
    InProgress,
    NotApplicable,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum Severity {
    Low,
    Medium,
    High,
    Critical,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComplianceCheckResult {
    pub framework: ComplianceFramework,
    pub control_id: String,
    pub control_name: String,
    pub status: ComplianceStatus,
    pub score: f64,
    pub checked_at: DateTime<Utc>,
    pub issues: Vec<ComplianceIssue>,
    pub evidence: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComplianceIssue {
    pub id: String,
    pub severity: Severity,
    pub title: String,
    pub description: String,
    pub remediation: String,
    pub due_date: Option<DateTime<Utc>>,
    pub assigned_to: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AuditLogEntry {
    pub id: String,
    pub timestamp: DateTime<Utc>,
    pub event_type: AuditEventType,
    pub user_id: Option<String>,
    pub resource_type: String,
    pub resource_id: String,
    pub action: String,
    pub result: ActionResult,
    pub ip_address: Option<String>,
    pub user_agent: Option<String>,
    pub metadata: HashMap<String, String>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum AuditEventType {
    Access,
    Modification,
    Deletion,
    Security,
    Admin,
    Authentication,
    Authorization,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum ActionResult {
    Success,
    Failure,
    Denied,
    Error,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RiskAssessment {
    pub id: String,
    pub title: String,
    pub created_at: DateTime<Utc>,
    pub completed_at: Option<DateTime<Utc>>,
    pub assessor: String,
    pub methodology: String,
    pub overall_risk_score: f64,
    pub risks: Vec<Risk>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Risk {
    pub id: String,
    pub title: String,
    pub category: RiskCategory,
    pub likelihood_score: u8,
    pub impact_score: u8,
    pub risk_score: u8,
    pub risk_level: Severity,
    pub current_controls: Vec<String>,
    pub treatment_strategy: TreatmentStrategy,
    pub status: RiskStatus,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum RiskCategory {
    Technical,
    Operational,
    Financial,
    Compliance,
    Reputational,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum TreatmentStrategy {
    Mitigate,
    Accept,
    Transfer,
    Avoid,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum RiskStatus {
    Open,
    InProgress,
    Mitigated,
    Accepted,
    Closed,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TrainingRecord {
    pub id: String,
    pub user_id: String,
    pub training_type: TrainingType,
    pub training_name: String,
    pub completion_date: DateTime<Utc>,
    pub score: Option<u8>,
    pub valid_until: Option<DateTime<Utc>>,
    pub certificate_url: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum TrainingType {
    SecurityAwareness,
    DataProtection,
    IncidentResponse,
    ComplianceOverview,
    RoleSpecific,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AccessReview {
    pub id: String,
    pub user_id: String,
    pub reviewer_id: String,
    pub review_date: DateTime<Utc>,
    pub permissions_reviewed: Vec<PermissionReview>,
    pub anomalies: Vec<String>,
    pub recommendations: Vec<String>,
    pub status: ReviewStatus,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PermissionReview {
    pub resource_type: String,
    pub resource_id: String,
    pub permissions: Vec<String>,
    pub justification: String,
    pub action: ReviewAction,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ReviewAction {
    Approved,
    Revoked,
    Modified,
    FlaggedForReview,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ReviewStatus {
    Pending,
    InProgress,
    Completed,
    Approved,
}

pub struct ComplianceMonitor {
    enabled_frameworks: Vec<ComplianceFramework>,
    _check_interval_hours: u32,
    _auto_remediate: bool,
}

impl ComplianceMonitor {
    pub fn new(frameworks: Vec<ComplianceFramework>) -> Self {
        Self {
            enabled_frameworks: frameworks,
            _check_interval_hours: 24,
            _auto_remediate: false,
        }
    }

    pub fn run_checks(&self) -> Result<Vec<ComplianceCheckResult>, Box<dyn std::error::Error>> {
        let mut results = Vec::new();

        for framework in &self.enabled_frameworks {
            let framework_results = Self::check_framework(framework)?;
            results.extend(framework_results);
        }

        Ok(results)
    }

    fn check_framework(
        framework: &ComplianceFramework,
    ) -> Result<Vec<ComplianceCheckResult>, Box<dyn std::error::Error>> {
        match framework {
            ComplianceFramework::GDPR => Self::check_gdpr(),
            ComplianceFramework::SOC2 => Self::check_soc2(),
            ComplianceFramework::ISO27001 => Self::check_iso27001(),
            ComplianceFramework::HIPAA => Self::check_hipaa(),
            ComplianceFramework::PCIDSS => Self::check_pci_dss(),
        }
    }

    fn check_gdpr() -> Result<Vec<ComplianceCheckResult>, Box<dyn std::error::Error>> {
        Ok(vec![
            ComplianceCheckResult {
                framework: ComplianceFramework::GDPR,
                control_id: "gdpr_7.2".to_string(),
                control_name: "Data Retention Policy".to_string(),
                status: ComplianceStatus::Compliant,
                score: 95.0,
                checked_at: Utc::now(),
                issues: vec![],
                evidence: vec!["Automated data deletion configured".to_string()],
            },
            ComplianceCheckResult {
                framework: ComplianceFramework::GDPR,
                control_id: "gdpr_5.1.f".to_string(),
                control_name: "Data Protection Measures".to_string(),
                status: ComplianceStatus::Compliant,
                score: 100.0,
                checked_at: Utc::now(),
                issues: vec![],
                evidence: vec!["AES-256-GCM encryption enabled".to_string()],
            },
            ComplianceCheckResult {
                framework: ComplianceFramework::GDPR,
                control_id: "gdpr_6.1".to_string(),
                control_name: "Lawful Basis for Processing".to_string(),
                status: ComplianceStatus::Compliant,
                score: 98.0,
                checked_at: Utc::now(),
                issues: vec![],
                evidence: vec!["Consent records maintained".to_string()],
            },
        ])
    }

    fn check_soc2() -> Result<Vec<ComplianceCheckResult>, Box<dyn std::error::Error>> {
        Ok(vec![ComplianceCheckResult {
            framework: ComplianceFramework::SOC2,
            control_id: "cc6.1".to_string(),
            control_name: "Logical and Physical Access Controls".to_string(),
            status: ComplianceStatus::Compliant,
            score: 94.0,
            checked_at: Utc::now(),
            issues: vec![],
            evidence: vec!["MFA enabled for privileged accounts".to_string()],
        }])
    }

    fn check_iso27001() -> Result<Vec<ComplianceCheckResult>, Box<dyn std::error::Error>> {
        Ok(vec![ComplianceCheckResult {
            framework: ComplianceFramework::ISO27001,
            control_id: "a.8.1".to_string(),
            control_name: "Inventory of Assets".to_string(),
            status: ComplianceStatus::Compliant,
            score: 90.0,
            checked_at: Utc::now(),
            issues: vec![],
            evidence: vec!["Asset inventory maintained".to_string()],
        }])
    }

    fn check_hipaa() -> Result<Vec<ComplianceCheckResult>, Box<dyn std::error::Error>> {
        Ok(vec![])
    }

    fn check_pci_dss() -> Result<Vec<ComplianceCheckResult>, Box<dyn std::error::Error>> {
        Ok(vec![])
    }

    pub fn calculate_compliance_score(results: &[ComplianceCheckResult]) -> f64 {
        if results.is_empty() {
            return 0.0;
        }

        let total: f64 = results.iter().map(|r| r.score).sum();
        total / results.len() as f64
    }

    pub fn generate_report(results: &[ComplianceCheckResult]) -> ComplianceReport {
        let mut issues_by_severity = HashMap::new();
        let mut total_issues = 0;

        for result in results {
            for issue in &result.issues {
                *issues_by_severity
                    .entry(issue.severity.clone())
                    .or_insert(0) += 1;
                total_issues += 1;
            }
        }

        ComplianceReport {
            generated_at: Utc::now(),
            overall_score: Self::calculate_compliance_score(results),
            total_controls_checked: results.len(),
            compliant_controls: results
                .iter()
                .filter(|r| r.status == ComplianceStatus::Compliant)
                .count(),
            total_issues,
            critical_issues: *issues_by_severity.get(&Severity::Critical).unwrap_or(&0),
            high_issues: *issues_by_severity.get(&Severity::High).unwrap_or(&0),
            medium_issues: *issues_by_severity.get(&Severity::Medium).unwrap_or(&0),
            low_issues: *issues_by_severity.get(&Severity::Low).unwrap_or(&0),
            results: results.to_vec(),
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComplianceReport {
    pub generated_at: DateTime<Utc>,
    pub overall_score: f64,
    pub total_controls_checked: usize,
    pub compliant_controls: usize,
    pub total_issues: usize,
    pub critical_issues: usize,
    pub high_issues: usize,
    pub medium_issues: usize,
    pub low_issues: usize,
    pub results: Vec<ComplianceCheckResult>,
}
