quantrs2-anneal 0.1.3

//! Validation utilities and integration verification

use std::collections::HashMap;
use std::time::Duration;

use super::results::{IntegrationValidationResult, ValidationStatus};
use super::scenarios::{IntegrationTestCase, ValidationMethod};

/// Integration verification system
pub struct IntegrationVerification {
    /// Verification rules
    pub verification_rules: Vec<VerificationRule>,
    /// Validation history
    pub validation_history: Vec<ValidationHistoryEntry>,
    /// Verification statistics
    pub statistics: VerificationStatistics,
}

impl IntegrationVerification {
    #[must_use]
    pub fn new() -> Self {
        Self {
            verification_rules: vec![],
            validation_history: vec![],
            statistics: VerificationStatistics::default(),
        }
    }

    /// Verify integration test case
    pub fn verify_test_case(
        &self,
        test_case: &IntegrationTestCase,
    ) -> Result<IntegrationValidationResult, String> {
        let start_time = std::time::SystemTime::now();
        let mut violations = Vec::new();

        // Apply all verification rules
        for rule in &self.verification_rules {
            if let Some(violation) = self.check_rule(rule, test_case) {
                violations.push(violation);
            }
        }

        let duration = start_time.elapsed().unwrap_or(Duration::from_secs(0));

        let status = if violations.is_empty() {
            ValidationStatus::Passed
        } else if violations
            .iter()
            .any(|v| matches!(v.severity, RuleSeverity::Critical | RuleSeverity::Error))
        {
            ValidationStatus::Failed
        } else {
            ValidationStatus::Partial
        };

        // Create validation result (simplified structure)
        Ok(IntegrationValidationResult {
            component_results: super::results::ComponentIntegrationResults {
                components: HashMap::new(),
                integration_matrix: vec![],
            },
            system_results: super::results::SystemIntegrationResults {
                end_to_end_results: vec![],
                system_health: super::results::SystemHealthMetrics {
                    health_score: if status == ValidationStatus::Passed {
                        1.0
                    } else {
                        0.5
                    },
                    component_health: HashMap::new(),
                    resource_utilization: super::results::ResourceUtilization {
                        cpu: 0.0,
                        memory: 0.0,
                        disk: 0.0,
                        network: 0.0,
                    },
                },
            },
            performance_results: super::results::PerformanceIntegrationResults {
                benchmarks: HashMap::new(),
                trends: super::results::PerformanceTrends {
                    execution_time_trend: vec![],
                    memory_trend: vec![],
                    success_rate_trend: vec![],
                },
                regressions: vec![],
            },
            overall_status: status,
        })
    }

    /// Check a verification rule against a test case
    const fn check_rule(
        &self,
        rule: &VerificationRule,
        _test_case: &IntegrationTestCase,
    ) -> Option<RuleViolation> {
        // Simplified rule checking
        match &rule.condition {
            VerificationCondition::Custom(_) => None,
            _ => None, // Other conditions would be checked here
        }
    }

    /// Add a verification rule
    pub fn add_rule(&mut self, rule: VerificationRule) {
        self.verification_rules.push(rule);
    }

    /// Remove a verification rule
    pub fn remove_rule(&mut self, rule_name: &str) {
        self.verification_rules.retain(|r| r.name != rule_name);
    }

    /// Get verification statistics
    #[must_use]
    pub const fn get_statistics(&self) -> &VerificationStatistics {
        &self.statistics
    }

    /// Clear validation history
    pub fn clear_history(&mut self) {
        self.validation_history.clear();
    }

    /// Get validation history
    #[must_use]
    pub fn get_history(&self) -> &[ValidationHistoryEntry] {
        &self.validation_history
    }

    /// Update statistics
    pub fn update_statistics(&mut self, status: ValidationStatus, duration: Duration) {
        self.statistics.total_verifications += 1;
        match status {
            ValidationStatus::Passed => self.statistics.successful_verifications += 1,
            ValidationStatus::Failed => self.statistics.failed_verifications += 1,
            _ => {}
        }

        // Update average verification time
        let total_time = self.statistics.avg_verification_time.as_secs_f64().mul_add(
            (self.statistics.total_verifications - 1) as f64,
            duration.as_secs_f64(),
        );
        self.statistics.avg_verification_time =
            Duration::from_secs_f64(total_time / self.statistics.total_verifications as f64);
    }
}

/// Verification rule definition
#[derive(Debug, Clone)]
pub struct VerificationRule {
    /// Rule name
    pub name: String,
    /// Rule description
    pub description: String,
    /// Rule type
    pub rule_type: VerificationRuleType,
    /// Rule condition
    pub condition: VerificationCondition,
    /// Rule severity
    pub severity: RuleSeverity,
}

/// Verification rule types
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum VerificationRuleType {
    /// Component compatibility
    ComponentCompatibility,
    /// Performance requirement
    PerformanceRequirement,
    /// Resource constraint
    ResourceConstraint,
    /// Security requirement
    SecurityRequirement,
    /// Custom rule
    Custom(String),
}

/// Verification condition
#[derive(Debug, Clone)]
pub enum VerificationCondition {
    /// Value comparison
    ValueComparison {
        field: String,
        operator: ComparisonOperator,
        value: VerificationValue,
    },
    /// Range check
    RangeCheck { field: String, min: f64, max: f64 },
    /// Pattern match
    PatternMatch { field: String, pattern: String },
    /// Custom condition
    Custom(String),
}

/// Comparison operators
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ComparisonOperator {
    Equal,
    NotEqual,
    GreaterThan,
    GreaterThanOrEqual,
    LessThan,
    LessThanOrEqual,
    Contains,
    StartsWith,
    EndsWith,
}

/// Verification value types
#[derive(Debug, Clone)]
pub enum VerificationValue {
    String(String),
    Number(f64),
    Boolean(bool),
    Duration(Duration),
    Array(Vec<Self>),
}

/// Rule severity levels
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum RuleSeverity {
    Info,
    Warning,
    Error,
    Critical,
}

/// Validation history entry
#[derive(Debug, Clone)]
pub struct ValidationHistoryEntry {
    /// Entry timestamp
    pub timestamp: std::time::SystemTime,
    /// Test case ID
    pub test_case_id: String,
    /// Validation result
    pub result: ValidationStatus,
    /// Validation duration
    pub duration: Duration,
    /// Rule violations
    pub violations: Vec<RuleViolation>,
}

/// Rule violation
#[derive(Debug, Clone)]
pub struct RuleViolation {
    /// Rule name
    pub rule_name: String,
    /// Violation message
    pub message: String,
    /// Violation severity
    pub severity: RuleSeverity,
    /// Violation context
    pub context: HashMap<String, String>,
}

/// Verification statistics
#[derive(Debug, Clone)]
pub struct VerificationStatistics {
    /// Total verifications
    pub total_verifications: usize,
    /// Successful verifications
    pub successful_verifications: usize,
    /// Failed verifications
    pub failed_verifications: usize,
    /// Average verification time
    pub avg_verification_time: Duration,
    /// Rule violation counts
    pub rule_violations: HashMap<String, usize>,
}

impl Default for VerificationStatistics {
    fn default() -> Self {
        Self {
            total_verifications: 0,
            successful_verifications: 0,
            failed_verifications: 0,
            avg_verification_time: Duration::from_secs(0),
            rule_violations: HashMap::new(),
        }
    }
}

/// Validation context
#[derive(Debug, Clone)]
pub struct ValidationContext {
    /// Test case being validated
    pub test_case: IntegrationTestCase,
    /// Validation parameters
    pub parameters: HashMap<String, String>,
    /// Validation environment
    pub environment: ValidationEnvironment,
}

/// Validation environment
#[derive(Debug, Clone)]
pub struct ValidationEnvironment {
    /// Environment name
    pub name: String,
    /// Environment variables
    pub variables: HashMap<String, String>,
    /// Resource constraints
    pub constraints: ResourceConstraints,
}

/// Resource constraints for validation
#[derive(Debug, Clone)]
pub struct ResourceConstraints {
    /// Maximum execution time
    pub max_execution_time: Duration,
    /// Maximum memory usage
    pub max_memory_usage: usize,
    /// Maximum CPU usage
    pub max_cpu_usage: f64,
    /// Maximum disk usage
    pub max_disk_usage: usize,
}

/// Validation executor
pub struct ValidationExecutor {
    /// Validation rules
    pub rules: Vec<VerificationRule>,
    /// Execution context
    pub context: ValidationContext,
    /// Validation methods
    pub methods: HashMap<ValidationMethod, Box<dyn Fn(&ValidationContext) -> ValidationStatus>>,
}

impl ValidationExecutor {
    #[must_use]
    pub fn new(context: ValidationContext) -> Self {
        Self {
            rules: vec![],
            context,
            methods: HashMap::new(),
        }
    }

    /// Execute validation
    pub fn execute(&self) -> Result<ValidationStatus, String> {
        let mut has_errors = false;
        let mut has_warnings = false;

        // Execute all validation rules
        for rule in &self.rules {
            match self.validate_rule(rule) {
                Ok(status) => match status {
                    ValidationStatus::Failed => has_errors = true,
                    ValidationStatus::Partial => has_warnings = true,
                    _ => {}
                },
                Err(_) => has_errors = true,
            }
        }

        Ok(if has_errors {
            ValidationStatus::Failed
        } else if has_warnings {
            ValidationStatus::Partial
        } else {
            ValidationStatus::Passed
        })
    }

    /// Validate a single rule
    const fn validate_rule(&self, rule: &VerificationRule) -> Result<ValidationStatus, String> {
        match &rule.condition {
            VerificationCondition::ValueComparison { .. } => Ok(ValidationStatus::Passed),
            VerificationCondition::RangeCheck { .. } => Ok(ValidationStatus::Passed),
            VerificationCondition::PatternMatch { .. } => Ok(ValidationStatus::Passed),
            VerificationCondition::Custom(_) => Ok(ValidationStatus::Passed),
        }
    }

    /// Add a validation rule
    pub fn add_rule(&mut self, rule: VerificationRule) {
        self.rules.push(rule);
    }

    /// Clear all validation rules
    pub fn clear_rules(&mut self) {
        self.rules.clear();
    }

    /// Get rule count
    #[must_use]
    pub fn rule_count(&self) -> usize {
        self.rules.len()
    }
}