use crate::analysis::unsafe_ffi_tracker::{RiskLevel, StackFrame};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
pub enum RiskFactorType {
    RawPointerDereference,
    UnsafeDataRace,
    InvalidTransmute,
    FfiCall,
    ManualMemoryManagement,
    CrossBoundaryTransfer,
    UseAfterFree,
    BufferOverflow,
    LifetimeViolation,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RiskFactor {
    pub factor_type: RiskFactorType,
    pub severity: f64,
    pub confidence: f64,
    pub description: String,
    pub source_location: Option<String>,
    pub call_stack: Vec<StackFrame>,
    pub mitigation: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RiskAssessment {
    pub risk_level: RiskLevel,
    pub risk_score: f64,
    pub risk_factors: Vec<RiskFactor>,
    pub confidence_score: f64,
    pub mitigation_suggestions: Vec<String>,
    pub assessment_timestamp: u64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UnsafeReport {
    pub report_id: String,
    pub source: UnsafeSource,
    pub risk_assessment: RiskAssessment,
    pub dynamic_violations: Vec<DynamicViolation>,
    pub related_passports: Vec<String>,
    pub memory_context: MemoryContext,
    pub generated_at: u64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum UnsafeSource {
    UnsafeBlock {
        location: String,
        function: String,
        file_path: Option<String>,
        line_number: Option<u32>,
    },
    FfiFunction {
        library: String,
        function: String,
        call_site: String,
    },
    RawPointer {
        operation: String,
        location: String,
    },
    Transmute {
        from_type: String,
        to_type: String,
        location: String,
    },
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DynamicViolation {
    pub violation_type: ViolationType,
    pub memory_address: usize,
    pub memory_size: usize,
    pub detected_at: u64,
    pub call_stack: Vec<StackFrame>,
    pub severity: RiskLevel,
    pub context: String,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum ViolationType {
    DoubleFree,
    UseAfterFree,
    BufferOverflow,
    InvalidAccess,
    DataRace,
    FfiBoundaryViolation,
    MemoryLeak,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryContext {
    pub total_allocated: usize,
    pub active_allocations: usize,
    pub memory_pressure: MemoryPressureLevel,
    pub allocation_patterns: Vec<AllocationPattern>,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum MemoryPressureLevel {
    Low,
    Medium,
    High,
    Critical,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AllocationPattern {
    pub pattern_type: String,
    pub frequency: u32,
    pub average_size: usize,
    pub risk_level: RiskLevel,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryPassport {
    pub passport_id: String,
    pub allocation_ptr: usize,
    pub size_bytes: usize,
    pub status_at_shutdown: PassportStatus,
    pub lifecycle_events: Vec<PassportEvent>,
    pub risk_assessment: RiskAssessment,
    pub created_at: u64,
    pub updated_at: u64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PassportStatus {
    FreedByRust,
    HandoverToFfi,
    FreedByForeign,
    ReclaimedByRust,
    InForeignCustody,
    Unknown,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PassportEvent {
    pub event_type: PassportEventType,
    pub timestamp: u64,
    pub context: String,
    pub call_stack: Vec<StackFrame>,
    pub metadata: HashMap<String, String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PassportEventType {
    AllocatedInRust,
    HandoverToFfi,
    FreedByForeign,
    ReclaimedByRust,
    BoundaryAccess,
    OwnershipTransfer,
}

#[cfg(test)]
mod tests {
    use super::*;

    /// Objective: Verify RiskFactorType enum variants
    /// Invariants: All variants should be constructible and comparable
    #[test]
    fn test_risk_factor_type_variants() {
        let variants = vec![
            RiskFactorType::RawPointerDereference,
            RiskFactorType::UnsafeDataRace,
            RiskFactorType::InvalidTransmute,
            RiskFactorType::FfiCall,
            RiskFactorType::ManualMemoryManagement,
            RiskFactorType::CrossBoundaryTransfer,
            RiskFactorType::UseAfterFree,
            RiskFactorType::BufferOverflow,
            RiskFactorType::LifetimeViolation,
        ];

        for variant in variants {
            let debug_str = format!("{variant:?}");
            assert!(
                !debug_str.is_empty(),
                "Variant should have debug representation"
            );
        }
    }

    /// Objective: Verify RiskFactor creation and fields
    /// Invariants: All fields should be accessible
    #[test]
    fn test_risk_factor_creation() {
        let factor = RiskFactor {
            factor_type: RiskFactorType::BufferOverflow,
            severity: 0.9,
            confidence: 0.85,
            description: "Test buffer overflow".to_string(),
            source_location: Some("test.rs:10".to_string()),
            call_stack: vec![],
            mitigation: "Use bounds checking".to_string(),
        };

        assert_eq!(factor.severity, 0.9, "Severity should match");
        assert_eq!(factor.confidence, 0.85, "Confidence should match");
        assert!(
            factor.source_location.is_some(),
            "Source location should be present"
        );
    }

    /// Objective: Verify RiskAssessment creation
    /// Invariants: All fields should be properly initialized
    #[test]
    fn test_risk_assessment_creation() {
        let assessment = RiskAssessment {
            risk_level: RiskLevel::High,
            risk_score: 75.0,
            risk_factors: vec![],
            confidence_score: 0.9,
            mitigation_suggestions: vec!["Review code".to_string()],
            assessment_timestamp: 1000,
        };

        assert_eq!(
            assessment.risk_level,
            RiskLevel::High,
            "Risk level should be High"
        );
        assert_eq!(assessment.risk_score, 75.0, "Risk score should match");
        assert_eq!(
            assessment.mitigation_suggestions.len(),
            1,
            "Should have one suggestion"
        );
    }

    /// Objective: Verify UnsafeSource variants
    /// Invariants: All source types should be constructible
    #[test]
    fn test_unsafe_source_variants() {
        let block = UnsafeSource::UnsafeBlock {
            location: "test.rs:10".to_string(),
            function: "test_fn".to_string(),
            file_path: Some("test.rs".to_string()),
            line_number: Some(10),
        };

        let ffi = UnsafeSource::FfiFunction {
            library: "libc".to_string(),
            function: "malloc".to_string(),
            call_site: "test.rs:20".to_string(),
        };

        let raw = UnsafeSource::RawPointer {
            operation: "deref".to_string(),
            location: "0x1000".to_string(),
        };

        let transmute = UnsafeSource::Transmute {
            from_type: "u8".to_string(),
            to_type: "i8".to_string(),
            location: "test.rs:30".to_string(),
        };

        assert!(matches!(block, UnsafeSource::UnsafeBlock { .. }));
        assert!(matches!(ffi, UnsafeSource::FfiFunction { .. }));
        assert!(matches!(raw, UnsafeSource::RawPointer { .. }));
        assert!(matches!(transmute, UnsafeSource::Transmute { .. }));
    }

    /// Objective: Verify DynamicViolation creation
    /// Invariants: All fields should be accessible
    #[test]
    fn test_dynamic_violation_creation() {
        let violation = DynamicViolation {
            violation_type: ViolationType::UseAfterFree,
            memory_address: 0x1000,
            memory_size: 1024,
            detected_at: 1000,
            call_stack: vec![],
            severity: RiskLevel::Critical,
            context: "Use after free detected".to_string(),
        };

        assert_eq!(
            violation.memory_address, 0x1000,
            "Memory address should match"
        );
        assert_eq!(violation.memory_size, 1024, "Memory size should match");
        assert_eq!(
            violation.severity,
            RiskLevel::Critical,
            "Severity should be Critical"
        );
    }

    /// Objective: Verify ViolationType variants
    /// Invariants: All variants should be comparable
    #[test]
    fn test_violation_type_equality() {
        assert_eq!(ViolationType::DoubleFree, ViolationType::DoubleFree);
        assert_eq!(ViolationType::UseAfterFree, ViolationType::UseAfterFree);
        assert_eq!(ViolationType::BufferOverflow, ViolationType::BufferOverflow);
        assert_eq!(ViolationType::InvalidAccess, ViolationType::InvalidAccess);
        assert_eq!(ViolationType::DataRace, ViolationType::DataRace);
        assert_eq!(
            ViolationType::FfiBoundaryViolation,
            ViolationType::FfiBoundaryViolation
        );

        assert_ne!(ViolationType::DoubleFree, ViolationType::UseAfterFree);
    }

    /// Objective: Verify MemoryContext creation
    /// Invariants: All fields should be properly initialized
    #[test]
    fn test_memory_context_creation() {
        let context = MemoryContext {
            total_allocated: 1024 * 1024,
            active_allocations: 10,
            memory_pressure: MemoryPressureLevel::Medium,
            allocation_patterns: vec![],
        };

        assert_eq!(
            context.total_allocated,
            1024 * 1024,
            "Total allocated should match"
        );
        assert_eq!(
            context.active_allocations, 10,
            "Active allocations should match"
        );
    }

    /// Objective: Verify MemoryPressureLevel variants
    /// Invariants: All levels should be distinct
    #[test]
    fn test_memory_pressure_level() {
        let levels = [
            MemoryPressureLevel::Low,
            MemoryPressureLevel::Medium,
            MemoryPressureLevel::High,
            MemoryPressureLevel::Critical,
        ];

        for (i, level) in levels.iter().enumerate() {
            for (j, other) in levels.iter().enumerate() {
                if i == j {
                    assert_eq!(level, other, "Same levels should be equal");
                } else {
                    assert_ne!(level, other, "Different levels should not be equal");
                }
            }
        }
    }

    /// Objective: Verify AllocationPattern creation
    /// Invariants: All fields should be accessible
    #[test]
    fn test_allocation_pattern_creation() {
        let pattern = AllocationPattern {
            pattern_type: "repeated".to_string(),
            frequency: 100,
            average_size: 256,
            risk_level: RiskLevel::Medium,
        };

        assert_eq!(pattern.frequency, 100, "Frequency should match");
        assert_eq!(pattern.average_size, 256, "Average size should match");
    }

    /// Objective: Verify MemoryPassport creation
    /// Invariants: All fields should be properly initialized
    #[test]
    fn test_memory_passport_creation() {
        let passport = MemoryPassport {
            passport_id: "passport_123".to_string(),
            allocation_ptr: 0x1000,
            size_bytes: 1024,
            status_at_shutdown: PassportStatus::Unknown,
            lifecycle_events: vec![],
            risk_assessment: RiskAssessment {
                risk_level: RiskLevel::Low,
                risk_score: 10.0,
                risk_factors: vec![],
                confidence_score: 0.5,
                mitigation_suggestions: vec![],
                assessment_timestamp: 0,
            },
            created_at: 1000,
            updated_at: 1000,
        };

        assert_eq!(
            passport.passport_id, "passport_123",
            "Passport ID should match"
        );
        assert_eq!(
            passport.allocation_ptr, 0x1000,
            "Allocation pointer should match"
        );
        assert_eq!(passport.size_bytes, 1024, "Size should match");
    }

    /// Objective: Verify PassportStatus variants
    /// Invariants: All statuses should be distinct
    #[test]
    fn test_passport_status_variants() {
        let statuses = vec![
            PassportStatus::FreedByRust,
            PassportStatus::HandoverToFfi,
            PassportStatus::FreedByForeign,
            PassportStatus::ReclaimedByRust,
            PassportStatus::InForeignCustody,
            PassportStatus::Unknown,
        ];

        for status in &statuses {
            let debug_str = format!("{status:?}");
            assert!(
                !debug_str.is_empty(),
                "Status should have debug representation"
            );
        }
    }

    /// Objective: Verify PassportEvent creation
    /// Invariants: All fields should be accessible
    #[test]
    fn test_passport_event_creation() {
        let event = PassportEvent {
            event_type: PassportEventType::HandoverToFfi,
            timestamp: 1000,
            context: "ffi_transfer".to_string(),
            call_stack: vec![],
            metadata: HashMap::new(),
        };

        assert_eq!(event.timestamp, 1000, "Timestamp should match");
        assert_eq!(event.context, "ffi_transfer", "Context should match");
    }

    /// Objective: Verify PassportEventType variants
    /// Invariants: All event types should be distinct
    #[test]
    fn test_passport_event_type_variants() {
        let event_types = vec![
            PassportEventType::AllocatedInRust,
            PassportEventType::HandoverToFfi,
            PassportEventType::FreedByForeign,
            PassportEventType::ReclaimedByRust,
            PassportEventType::BoundaryAccess,
            PassportEventType::OwnershipTransfer,
        ];

        for event_type in &event_types {
            let debug_str = format!("{event_type:?}");
            assert!(
                !debug_str.is_empty(),
                "Event type should have debug representation"
            );
        }
    }

    /// Objective: Verify UnsafeReport creation
    /// Invariants: All fields should be properly initialized
    #[test]
    fn test_unsafe_report_creation() {
        let report = UnsafeReport {
            report_id: "UNSAFE-UB-123".to_string(),
            source: UnsafeSource::UnsafeBlock {
                location: "test.rs".to_string(),
                function: "test".to_string(),
                file_path: None,
                line_number: None,
            },
            risk_assessment: RiskAssessment {
                risk_level: RiskLevel::Medium,
                risk_score: 50.0,
                risk_factors: vec![],
                confidence_score: 0.8,
                mitigation_suggestions: vec![],
                assessment_timestamp: 0,
            },
            dynamic_violations: vec![],
            related_passports: vec![],
            memory_context: MemoryContext {
                total_allocated: 0,
                active_allocations: 0,
                memory_pressure: MemoryPressureLevel::Low,
                allocation_patterns: vec![],
            },
            generated_at: 1000,
        };

        assert_eq!(report.report_id, "UNSAFE-UB-123", "Report ID should match");
        assert_eq!(
            report.generated_at, 1000,
            "Generated timestamp should match"
        );
    }

    /// Objective: Verify RiskFactor with edge case values
    /// Invariants: Should handle zero and max values
    #[test]
    fn test_risk_factor_edge_values() {
        let zero_factor = RiskFactor {
            factor_type: RiskFactorType::UseAfterFree,
            severity: 0.0,
            confidence: 0.0,
            description: String::new(),
            source_location: None,
            call_stack: vec![],
            mitigation: String::new(),
        };

        let max_factor = RiskFactor {
            factor_type: RiskFactorType::BufferOverflow,
            severity: 1.0,
            confidence: 1.0,
            description: "x".repeat(1000),
            source_location: Some("x".repeat(1000)),
            call_stack: vec![],
            mitigation: "x".repeat(1000),
        };

        assert_eq!(zero_factor.severity, 0.0, "Zero severity should be valid");
        assert_eq!(max_factor.severity, 1.0, "Max severity should be valid");
        assert_eq!(
            max_factor.description.len(),
            1000,
            "Long description should be preserved"
        );
    }

    /// Objective: Verify serialization of types
    /// Invariants: Types should serialize and deserialize correctly
    #[test]
    fn test_serialization() {
        let assessment = RiskAssessment {
            risk_level: RiskLevel::High,
            risk_score: 75.0,
            risk_factors: vec![],
            confidence_score: 0.9,
            mitigation_suggestions: vec!["test".to_string()],
            assessment_timestamp: 1000,
        };

        let json = serde_json::to_string(&assessment);
        assert!(json.is_ok(), "Should serialize to JSON");

        let deserialized: Result<RiskAssessment, _> = serde_json::from_str(&json.unwrap());
        assert!(deserialized.is_ok(), "Should deserialize from JSON");
    }
}
