use crate::capture::types::ImplementationDifficulty;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UnknownMemoryRegionAnalysis {
    pub total_unknown_bytes: usize,
    pub unknown_percentage: f64,
    pub unknown_categories: Vec<UnknownMemoryCategory>,
    pub potential_causes: Vec<UnknownMemoryCause>,
    pub reduction_strategies: Vec<UnknownRegionReductionStrategy>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UnknownMemoryCategory {
    pub category_type: UnknownRegionType,
    pub description: String,
    pub estimated_size: usize,
    pub confidence_level: f64,
    pub examples: Vec<UnknownMemoryExample>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum UnknownRegionType {
    MemoryMappedRegions,
    ThreadLocalStorage,
    DynamicLibraryRegions,
    SystemReservedRegions,
    JitCodeRegions,
    ExternalLibraryAllocations,
    GuardPages,
    VdsoRegions,
    AnonymousMappings,
    SharedMemorySegments,
    PreTrackingAllocations,
    CorruptedMetadata,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UnknownMemoryExample {
    pub address_range: (usize, usize),
    pub size: usize,
    pub suspected_origin: String,
    pub access_pattern: MemoryAccessPattern,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum UnknownMemoryCause {
    ForeignFunctionInterface {
        library_name: String,
        function_name: Option<String>,
    },
    MemoryMapping {
        mapping_type: MappingType,
        file_path: Option<String>,
    },
    SystemAllocations {
        allocation_type: SystemAllocationType,
    },
    ThreadingMemory {
        thread_id: Option<u64>,
        memory_type: ThreadMemoryType,
    },
    DynamicLoading {
        library_path: String,
        load_time: u64,
    },
    InstrumentationGaps {
        gap_type: InstrumentationGapType,
        description: String,
    },
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum MappingType {
    FileMapping,
    AnonymousMapping,
    SharedMapping,
    DeviceMapping,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum SystemAllocationType {
    KernelBuffers,
    DriverMemory,
    SystemCaches,
    HardwareReserved,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ThreadMemoryType {
    ThreadStack,
    ThreadLocalStorage,
    ThreadControlBlock,
    ThreadSynchronization,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum InstrumentationGapType {
    EarlyBootstrap,
    SignalHandlers,
    InterruptHandlers,
    AtomicOperations,
    CompilerOptimizations,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UnknownRegionReductionStrategy {
    pub strategy_type: ReductionStrategyType,
    pub description: String,
    pub implementation_steps: Vec<String>,
    pub expected_improvement: f64,
    pub implementation_difficulty: ImplementationDifficulty,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ReductionStrategyType {
    EnhancedInstrumentation,
    BetterSymbolResolution,
    MemoryMappingTracking,
    FfiCallInterception,
    SystemCallMonitoring,
    ThreadAwareTracking,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SystemRegionInfo {
    pub region_type: String,
    pub description: String,
    pub read_only: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LibraryMappingInfo {
    pub start_address: usize,
    pub end_address: usize,
    pub permissions: String,
    pub file_path: String,
}

impl LibraryMappingInfo {
    pub fn contains_address(&self, addr: usize) -> bool {
        addr >= self.start_address && addr < self.end_address
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum MemoryAccessPattern {
    Sequential,
    Random,
    Sparse,
    Unknown,
}

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

    /// Objective: Verify UnknownMemoryRegionAnalysis creation
    /// Invariants: All fields should be properly initialized
    #[test]
    fn test_analysis_creation() {
        let analysis = UnknownMemoryRegionAnalysis {
            total_unknown_bytes: 1024,
            unknown_percentage: 25.5,
            unknown_categories: vec![],
            potential_causes: vec![],
            reduction_strategies: vec![],
        };

        assert_eq!(
            analysis.total_unknown_bytes, 1024,
            "Total bytes should match"
        );
        assert_eq!(analysis.unknown_percentage, 25.5, "Percentage should match");
    }

    /// Objective: Verify UnknownMemoryCategory creation
    /// Invariants: All fields should be accessible
    #[test]
    fn test_category_creation() {
        let category = UnknownMemoryCategory {
            category_type: UnknownRegionType::MemoryMappedRegions,
            description: "Test category".to_string(),
            estimated_size: 4096,
            confidence_level: 0.85,
            examples: vec![],
        };

        assert_eq!(category.estimated_size, 4096, "Size should match");
        assert_eq!(category.confidence_level, 0.85, "Confidence should match");
    }

    /// Objective: Verify UnknownRegionType variants
    /// Invariants: All variants should be distinct
    #[test]
    fn test_region_type_variants() {
        let variants = [
            UnknownRegionType::MemoryMappedRegions,
            UnknownRegionType::ThreadLocalStorage,
            UnknownRegionType::DynamicLibraryRegions,
            UnknownRegionType::SystemReservedRegions,
            UnknownRegionType::JitCodeRegions,
            UnknownRegionType::ExternalLibraryAllocations,
            UnknownRegionType::GuardPages,
            UnknownRegionType::VdsoRegions,
            UnknownRegionType::AnonymousMappings,
            UnknownRegionType::SharedMemorySegments,
            UnknownRegionType::PreTrackingAllocations,
            UnknownRegionType::CorruptedMetadata,
        ];

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

    /// Objective: Verify UnknownMemoryExample creation
    /// Invariants: All fields should be properly initialized
    #[test]
    fn test_example_creation() {
        let example = UnknownMemoryExample {
            address_range: (0x1000, 0x2000),
            size: 4096,
            suspected_origin: "mmap".to_string(),
            access_pattern: MemoryAccessPattern::Sequential,
        };

        assert_eq!(
            example.address_range.0, 0x1000,
            "Start address should match"
        );
        assert_eq!(example.size, 4096, "Size should match");
    }

    /// Objective: Verify UnknownMemoryCause variants
    /// Invariants: All variants should be constructible
    #[test]
    fn test_cause_variants() {
        let ffi_cause = UnknownMemoryCause::ForeignFunctionInterface {
            library_name: "libc".to_string(),
            function_name: Some("malloc".to_string()),
        };

        let mmap_cause = UnknownMemoryCause::MemoryMapping {
            mapping_type: MappingType::AnonymousMapping,
            file_path: None,
        };

        let system_cause = UnknownMemoryCause::SystemAllocations {
            allocation_type: SystemAllocationType::KernelBuffers,
        };

        let thread_cause = UnknownMemoryCause::ThreadingMemory {
            thread_id: Some(1),
            memory_type: ThreadMemoryType::ThreadStack,
        };

        let dynamic_cause = UnknownMemoryCause::DynamicLoading {
            library_path: "/lib/test.so".to_string(),
            load_time: 1000,
        };

        let gap_cause = UnknownMemoryCause::InstrumentationGaps {
            gap_type: InstrumentationGapType::EarlyBootstrap,
            description: "Early initialization".to_string(),
        };

        assert!(matches!(
            ffi_cause,
            UnknownMemoryCause::ForeignFunctionInterface { .. }
        ));
        assert!(matches!(
            mmap_cause,
            UnknownMemoryCause::MemoryMapping { .. }
        ));
        assert!(matches!(
            system_cause,
            UnknownMemoryCause::SystemAllocations { .. }
        ));
        assert!(matches!(
            thread_cause,
            UnknownMemoryCause::ThreadingMemory { .. }
        ));
        assert!(matches!(
            dynamic_cause,
            UnknownMemoryCause::DynamicLoading { .. }
        ));
        assert!(matches!(
            gap_cause,
            UnknownMemoryCause::InstrumentationGaps { .. }
        ));
    }

    /// Objective: Verify MappingType variants
    /// Invariants: All variants should be distinct
    #[test]
    fn test_mapping_type_variants() {
        assert!(matches!(MappingType::FileMapping, MappingType::FileMapping));
        assert!(matches!(
            MappingType::AnonymousMapping,
            MappingType::AnonymousMapping
        ));
        assert!(matches!(
            MappingType::SharedMapping,
            MappingType::SharedMapping
        ));
        assert!(matches!(
            MappingType::DeviceMapping,
            MappingType::DeviceMapping
        ));
    }

    /// Objective: Verify SystemAllocationType variants
    /// Invariants: All variants should be distinct
    #[test]
    fn test_system_allocation_type_variants() {
        let variants = [
            SystemAllocationType::KernelBuffers,
            SystemAllocationType::DriverMemory,
            SystemAllocationType::SystemCaches,
            SystemAllocationType::HardwareReserved,
        ];

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

    /// Objective: Verify ThreadMemoryType variants
    /// Invariants: All variants should be distinct
    #[test]
    fn test_thread_memory_type_variants() {
        let variants = [
            ThreadMemoryType::ThreadStack,
            ThreadMemoryType::ThreadLocalStorage,
            ThreadMemoryType::ThreadControlBlock,
            ThreadMemoryType::ThreadSynchronization,
        ];

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

    /// Objective: Verify InstrumentationGapType variants
    /// Invariants: All variants should be distinct
    #[test]
    fn test_instrumentation_gap_type_variants() {
        let variants = [
            InstrumentationGapType::EarlyBootstrap,
            InstrumentationGapType::SignalHandlers,
            InstrumentationGapType::InterruptHandlers,
            InstrumentationGapType::AtomicOperations,
            InstrumentationGapType::CompilerOptimizations,
        ];

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

    /// Objective: Verify UnknownRegionReductionStrategy creation
    /// Invariants: All fields should be accessible
    #[test]
    fn test_reduction_strategy_creation() {
        let strategy = UnknownRegionReductionStrategy {
            strategy_type: ReductionStrategyType::EnhancedInstrumentation,
            description: "Test strategy".to_string(),
            implementation_steps: vec!["Step 1".to_string(), "Step 2".to_string()],
            expected_improvement: 50.0,
            implementation_difficulty: ImplementationDifficulty::Medium,
        };

        assert_eq!(
            strategy.implementation_steps.len(),
            2,
            "Should have two steps"
        );
        assert_eq!(
            strategy.expected_improvement, 50.0,
            "Improvement should match"
        );
    }

    /// Objective: Verify ReductionStrategyType variants
    /// Invariants: All variants should be distinct
    #[test]
    fn test_reduction_strategy_type_variants() {
        let variants = [
            ReductionStrategyType::EnhancedInstrumentation,
            ReductionStrategyType::BetterSymbolResolution,
            ReductionStrategyType::MemoryMappingTracking,
            ReductionStrategyType::FfiCallInterception,
            ReductionStrategyType::SystemCallMonitoring,
            ReductionStrategyType::ThreadAwareTracking,
        ];

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

    /// Objective: Verify SystemRegionInfo creation
    /// Invariants: All fields should be accessible
    #[test]
    fn test_system_region_info_creation() {
        let info = SystemRegionInfo {
            region_type: "kernel".to_string(),
            description: "Kernel region".to_string(),
            read_only: true,
        };

        assert_eq!(info.region_type, "kernel", "Region type should match");
        assert!(info.read_only, "Should be read-only");
    }

    /// Objective: Verify LibraryMappingInfo creation and contains_address
    /// Invariants: Address bounds should be correctly checked
    #[test]
    fn test_library_mapping_info() {
        let info = LibraryMappingInfo {
            start_address: 0x1000,
            end_address: 0x2000,
            permissions: "r-x".to_string(),
            file_path: "/lib/test.so".to_string(),
        };

        assert!(info.contains_address(0x1000), "Start should be contained");
        assert!(info.contains_address(0x1500), "Middle should be contained");
        assert!(
            !info.contains_address(0x2000),
            "End should not be contained"
        );
        assert!(
            !info.contains_address(0x500),
            "Before should not be contained"
        );
    }

    /// Objective: Verify MemoryAccessPattern variants
    /// Invariants: All variants should be distinct
    #[test]
    fn test_memory_access_pattern_variants() {
        assert!(matches!(
            MemoryAccessPattern::Sequential,
            MemoryAccessPattern::Sequential
        ));
        assert!(matches!(
            MemoryAccessPattern::Random,
            MemoryAccessPattern::Random
        ));
        assert!(matches!(
            MemoryAccessPattern::Sparse,
            MemoryAccessPattern::Sparse
        ));
        assert!(matches!(
            MemoryAccessPattern::Unknown,
            MemoryAccessPattern::Unknown
        ));
    }

    /// Objective: Verify serialization of types
    /// Invariants: Types should serialize and deserialize correctly
    #[test]
    fn test_serialization() {
        let analysis = UnknownMemoryRegionAnalysis {
            total_unknown_bytes: 1024,
            unknown_percentage: 25.5,
            unknown_categories: vec![],
            potential_causes: vec![],
            reduction_strategies: vec![],
        };

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

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

    /// Objective: Verify edge case with zero values
    /// Invariants: Should handle zero values correctly
    #[test]
    fn test_zero_values() {
        let analysis = UnknownMemoryRegionAnalysis {
            total_unknown_bytes: 0,
            unknown_percentage: 0.0,
            unknown_categories: vec![],
            potential_causes: vec![],
            reduction_strategies: vec![],
        };

        assert_eq!(
            analysis.total_unknown_bytes, 0,
            "Zero bytes should be valid"
        );
        assert_eq!(
            analysis.unknown_percentage, 0.0,
            "Zero percentage should be valid"
        );
    }
}
