//! 100-Point Popperian Falsification QA Checklist Verification
//!
//! This module documents which items from the specification's falsification checklist
//! are covered by tests in the entrenar prune module.
//!
//! # References
//! - spec: docs/specifications/advanced-pruning.md, Section 10

/// Falsification checklist item status
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ChecklistStatus {
    /// Item is covered by tests in aprender
    CoveredAprender,
    /// Item is covered by tests in entrenar
    CoveredEntrenar,
    /// Item is partially covered
    Partial,
    /// Not applicable to current scope
    NotApplicable,
    /// Future work
    Future,
}

/// Falsification checklist item
#[derive(Debug)]
pub struct ChecklistItem {
    pub id: usize,
    pub description: &'static str,
    pub status: ChecklistStatus,
    pub test_reference: &'static str,
}

/// Get the full 100-point falsification checklist with coverage status
pub fn get_checklist() -> Vec<ChecklistItem> {
    vec![
        // =============================
        // 10.1 Numerical Stability (1-15)
        // =============================
        ChecklistItem {
            id: 1,
            description: "Magnitude pruning on all-zero weights",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_magnitude_all_zeros_no_nan",
        },
        ChecklistItem {
            id: 2,
            description: "Wanda with zero activations",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_wanda_zero_activations_handled",
        },
        ChecklistItem {
            id: 9,
            description: "Wanda with zero activation norms",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_wanda_zero_activations_handled",
        },
        ChecklistItem {
            id: 12,
            description: "Pruning with target sparsity 0.0",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "schedule::tests::test_oneshot_before_step_returns_zero",
        },
        ChecklistItem {
            id: 13,
            description: "Pruning with target sparsity 1.0",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "schedule::tests::test_oneshot_at_step_returns_one",
        },
        // =============================
        // 10.2 Shape Handling (16-30)
        // =============================
        ChecklistItem {
            id: 16,
            description: "2:4 mask on non-divisible size",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_nm_pattern_validates",
        },
        ChecklistItem {
            id: 19,
            description: "Mask with wrong shape",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_mask_apply_wrong_shape",
        },
        // =============================
        // 10.3 Algorithm Correctness (31-50)
        // =============================
        ChecklistItem {
            id: 31,
            description: "Magnitude L1 equals |w|",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_magnitude_l1_equals_abs_weight",
        },
        ChecklistItem {
            id: 32,
            description: "Magnitude L2 equals w^2",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_magnitude_l2_equals_weight_squared",
        },
        ChecklistItem {
            id: 33,
            description: "Wanda importance formula",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_wanda_formula_correct",
        },
        ChecklistItem {
            id: 34,
            description: "2:4 mask structure verification",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_nm_mask_validates_structure",
        },
        ChecklistItem {
            id: 40,
            description: "Welford online algorithm correctness",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "calibrate::tests::test_welford_*",
        },
        ChecklistItem {
            id: 45,
            description: "Cubic schedule formula",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "schedule::tests::test_cubic_formula_*",
        },
        ChecklistItem {
            id: 46,
            description: "Gradual schedule monotonicity",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "schedule::tests::test_sparsity_monotonic_gradual",
        },
        ChecklistItem {
            id: 47,
            description: "Non-negative importance scores",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_importance_non_negative",
        },
        ChecklistItem {
            id: 48,
            description: "Mask application idempotent",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_mask_apply_idempotent",
        },
        ChecklistItem {
            id: 50,
            description: "N:M constraint after mask",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_nm_mask_validates_structure",
        },
        // =============================
        // 10.4 Edge Cases (51-65)
        // =============================
        ChecklistItem {
            id: 51,
            description: "Prune at step boundary",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "schedule::tests::test_gradual_*",
        },
        ChecklistItem {
            id: 52,
            description: "Wanda without calibration errors",
            status: ChecklistStatus::CoveredAprender,
            test_reference: "aprender::pruning::tests::test_wanda_errors_without_calibration",
        },
        // =============================
        // 10.6 Integration (81-90)
        // =============================
        ChecklistItem {
            id: 89,
            description: "Pruning callback with entrenar callbacks",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "callback::tests::*",
        },
        ChecklistItem {
            id: 90,
            description: "Generate config from YAML",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "config::tests::test_config_deserialize_from_yaml",
        },
        // =============================
        // 10.7 Documentation (91-100)
        // =============================
        ChecklistItem {
            id: 91,
            description: "Public functions have doc comments",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "cargo doc verification",
        },
        ChecklistItem {
            id: 93,
            description: "Doc examples compile",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "cargo test --doc",
        },
        ChecklistItem {
            id: 97,
            description: "Config options documented",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "config.rs doc comments",
        },
        ChecklistItem {
            id: 99,
            description: "Citations included",
            status: ChecklistStatus::CoveredEntrenar,
            test_reference: "mod.rs and schedule.rs references",
        },
    ]
}

/// Get summary statistics for the checklist
pub fn checklist_summary() -> (usize, usize, usize) {
    let checklist = get_checklist();
    let covered = checklist
        .iter()
        .filter(|i| {
            matches!(
                i.status,
                ChecklistStatus::CoveredAprender | ChecklistStatus::CoveredEntrenar
            )
        })
        .count();
    let partial = checklist
        .iter()
        .filter(|i| i.status == ChecklistStatus::Partial)
        .count();
    let total = checklist.len();
    (covered, partial, total)
}

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

    #[test]
    fn test_checklist_items_defined() {
        // TEST_ID: FALS-001
        // Verify we have documented checklist items
        let checklist = get_checklist();
        assert!(
            checklist.len() >= 20,
            "FALS-001 FALSIFIED: Should have at least 20 documented items"
        );
    }

    #[test]
    fn test_checklist_items_have_references() {
        // TEST_ID: FALS-002
        // Verify all items have test references
        let checklist = get_checklist();
        for item in &checklist {
            assert!(
                !item.test_reference.is_empty(),
                "FALS-002 FALSIFIED: Item {} should have test reference",
                item.id
            );
        }
    }

    #[test]
    fn test_checklist_coverage_summary() {
        // TEST_ID: FALS-003
        // Verify we have good checklist coverage
        let (covered, _partial, total) = checklist_summary();
        let coverage = covered as f32 / total as f32;
        assert!(
            coverage >= 0.5,
            "FALS-003 FALSIFIED: Checklist coverage should be >= 50%, got {:.0}%",
            coverage * 100.0
        );
    }

    #[test]
    fn test_numerical_stability_items_covered() {
        // TEST_ID: FALS-010
        // Verify numerical stability items are covered
        let checklist = get_checklist();
        let numerical_items: Vec<_> = checklist.iter().filter(|i| i.id <= 15).collect();
        assert!(
            !numerical_items.is_empty(),
            "FALS-010 FALSIFIED: Should have numerical stability items (1-15)"
        );
    }

    #[test]
    fn test_algorithm_correctness_items_covered() {
        // TEST_ID: FALS-011
        // Verify algorithm correctness items are covered
        let checklist = get_checklist();
        let algo_items: Vec<_> = checklist
            .iter()
            .filter(|i| i.id >= 31 && i.id <= 50)
            .collect();
        assert!(
            algo_items.len() >= 5,
            "FALS-011 FALSIFIED: Should have at least 5 algorithm correctness items (31-50)"
        );
    }

    #[test]
    fn test_documentation_items_covered() {
        // TEST_ID: FALS-012
        // Verify documentation items are covered
        let checklist = get_checklist();
        let doc_items: Vec<_> = checklist.iter().filter(|i| i.id >= 91).collect();
        assert!(
            doc_items.len() >= 3,
            "FALS-012 FALSIFIED: Should have at least 3 documentation items (91-100)"
        );
    }
}
