//! Popperian Falsification Test Suite for Scalar Int8 Rescoring Retriever
//!
//! Implements the 100-point falsification checklist from retriever-spec.md
//! Following Toyota Way principles with Jidoka stop-on-error validation.
//!
//! # Sections
//!
//! - QA: Quantization Accuracy (15 items)
//! - RA: Retrieval Accuracy (15 items)
//! - PF: Performance (15 items)
//! - NC: Numerical Correctness (15 items)
//! - SR: Safety & Robustness (10 items)
//! - AI: API & Integration (10 items)
//! - JG: Jidoka Gates (10 items)
//! - DR: Documentation & Reproducibility (10 items)

#[allow(unused_imports)]
use super::quantization::*;

// ============================================================================
// Falsification Result Types
// ============================================================================

/// Result of a falsification test
#[derive(Debug, Clone)]
pub struct FalsificationResult {
    /// Test ID (e.g., "QA-01")
    pub id: String,
    /// Test name
    pub name: String,
    /// Whether the claim was falsified (true = FAIL, false = PASS)
    pub falsified: bool,
    /// Evidence collected
    pub evidence: Vec<String>,
    /// TPS Principle applied
    pub tps_principle: TpsPrinciple,
    /// Severity level
    pub severity: Severity,
}

/// Toyota Production System principle
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TpsPrinciple {
    /// Jidoka - Stop on error
    Jidoka,
    /// Poka-Yoke - Mistake-proofing
    PokaYoke,
    /// Heijunka - Load leveling
    Heijunka,
    /// Kaizen - Continuous improvement
    Kaizen,
    /// Genchi Genbutsu - Go and see
    GenchiGenbutsu,
    /// Muda - Waste elimination
    Muda,
    /// Muri - Overload prevention
    Muri,
    /// Mura - Variance reduction
    Mura,
}

/// Severity level for falsification failures
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum Severity {
    /// Invalidates core claims
    Critical,
    /// Significantly weakens validity
    Major,
    /// Edge case/boundary issue
    Minor,
    /// Clarification needed
    Informational,
}

impl FalsificationResult {
    pub fn pass(id: &str, name: &str, tps: TpsPrinciple, severity: Severity) -> Self {
        Self {
            id: id.to_string(),
            name: name.to_string(),
            falsified: false,
            evidence: vec![],
            tps_principle: tps,
            severity,
        }
    }

    pub fn fail(
        id: &str,
        name: &str,
        tps: TpsPrinciple,
        severity: Severity,
        evidence: Vec<String>,
    ) -> Self {
        Self {
            id: id.to_string(),
            name: name.to_string(),
            falsified: true,
            evidence,
            tps_principle: tps,
            severity,
        }
    }

    pub fn with_evidence(mut self, evidence: &str) -> Self {
        self.evidence.push(evidence.to_string());
        self
    }
}

/// Falsification suite summary
#[derive(Debug, Clone)]
pub struct FalsificationSummary {
    pub total: usize,
    pub passed: usize,
    pub failed: usize,
    pub score: f64,
    pub grade: Grade,
    pub results: Vec<FalsificationResult>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Grade {
    /// 95-100% - Toyota Standard
    ToyotaStandard,
    /// 85-94% - Kaizen Required
    KaizenRequired,
    /// 70-84% - Andon Warning
    AndonWarning,
    /// <70% - Stop the Line
    StopTheLine,
}

impl FalsificationSummary {
    pub fn new(results: Vec<FalsificationResult>) -> Self {
        let total = results.len();
        let passed = results.iter().filter(|r| !r.falsified).count();
        let failed = total - passed;
        let score = if total > 0 {
            (passed as f64 / total as f64) * 100.0
        } else {
            0.0
        };
        let grade = match score as u32 {
            95..=100 => Grade::ToyotaStandard,
            85..=94 => Grade::KaizenRequired,
            70..=84 => Grade::AndonWarning,
            _ => Grade::StopTheLine,
        };

        Self {
            total,
            passed,
            failed,
            score,
            grade,
            results,
        }
    }
}

// ============================================================================
// Shared Test Helpers
// ============================================================================
// ============================================================================
// Run Full Falsification Suite
// ============================================================================

/// Run all falsification tests and return summary
pub fn run_falsification_suite() -> FalsificationSummary {
    // This would collect results from all test modules
    // For now, return a placeholder
    let results = vec![
        FalsificationResult::pass(
            "QA-01",
            "Quantization Error Bound",
            TpsPrinciple::PokaYoke,
            Severity::Critical,
        ),
        FalsificationResult::pass(
            "QA-02",
            "Symmetric Quantization",
            TpsPrinciple::GenchiGenbutsu,
            Severity::Major,
        ),
        // ... more results would be collected from actual test runs
    ];

    FalsificationSummary::new(results)
}

#[cfg(test)]
#[path = "falsification_tests.rs"]
mod tests;
