// TEST-001: Test-Driven Development for Notebook Testing Framework
// Sprint 1: Core Testing Infrastructure (v1.96.0)
// PMAT Complexity Target: <10 per function
// Coverage Target: ≥80%

// These modules don't exist yet in the public API
// TODO: Implement these as part of the notebook testing framework
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use tempfile::TempDir;

#[cfg(test)]
mod test_command_handler {
    use super::*;
    
    /// TEST-001: Verify ruchy test command handler exists and works
    #[test]
    fn test_ruchy_test_command_basic() {
        // Arrange
        let temp_dir = TempDir::new().unwrap();
        let notebook_path = temp_dir.path().join("test.ruchynb");
        std::fs::write(&notebook_path, r#"{
            "cells": [
                {
                    "cell_type": "code",
                    "source": "2 + 3",
                    "metadata": {
                        "test": {
                            "type": "deterministic",
                            "expected": "5"
                        }
                    }
                }
            ]
        }"#).unwrap();
        
        // Act
        let result = ruchy::cli::run_test_command(&notebook_path, TestConfig::default());
        
        // Assert
        assert!(result.is_ok());
        let report = result.unwrap();
        assert_eq!(report.total_tests, 1);
        assert_eq!(report.passed_tests, 1);
        assert_eq!(report.failed_tests, 0);
    }
    
    /// TEST-001: Test with coverage flag
    #[test]
    fn test_ruchy_test_with_coverage() {
        let config = TestConfig {
            coverage: true,
            ..Default::default()
        };
        
        let temp_dir = TempDir::new().unwrap();
        let notebook_path = temp_dir.path().join("coverage_test.ruchynb");
        std::fs::write(&notebook_path, r#"{
            "cells": [
                {
                    "cell_type": "code",
                    "source": "fun add(x, y) { if x > 0 { x + y } else { y } }",
                    "metadata": {}
                },
                {
                    "cell_type": "code",
                    "source": "add(5, 3)",
                    "metadata": {
                        "test": {
                            "type": "deterministic",
                            "expected": "8"
                        }
                    }
                }
            ]
        }"#).unwrap();
        
        let result = ruchy::cli::run_test_command(&notebook_path, config);
        assert!(result.is_ok());
        
        let report = result.unwrap();
        assert!(report.coverage.is_some());
        let coverage = report.coverage.unwrap();
        assert!(coverage.line_coverage > 0.0);
        assert!(coverage.branch_coverage >= 0.0); // Not all branches covered
    }
}

#[cfg(test)]
mod test_notebook_tester {
    use super::*;
    
    /// TEST-002: Test notebook cell execution
    #[test]
    fn test_execute_simple_cell() {
        let tester = NotebookTester::new();
        let cell = Cell {
            id: "test_cell_1".to_string(),
            source: "2 + 3".to_string(),
            cell_type: CellType::Code,
            metadata: CellMetadata::default(),
        };
        
        let output = tester.execute_cell(&cell);
        assert!(output.is_ok());
        
        let result = output.unwrap();
        match result {
            CellOutput::Value(val) => assert_eq!(val, "5"),
            _ => panic!("Expected Value output"),
        }
    }
    
    /// TEST-002: Test cell with state preservation
    #[test]
    fn test_state_preservation_between_cells() {
        let mut tester = NotebookTester::new();
        
        // First cell: define variable
        let cell1 = Cell {
            id: "cell_1".to_string(),
            source: "let x = 10".to_string(),
            cell_type: CellType::Code,
            metadata: CellMetadata::default(),
        };
        
        let result1 = tester.execute_cell(&cell1);
        assert!(result1.is_ok());
        
        // Second cell: use variable from first cell
        let cell2 = Cell {
            id: "cell_2".to_string(),
            source: "x * 2".to_string(),
            cell_type: CellType::Code,
            metadata: CellMetadata::default(),
        };
        
        let result2 = tester.execute_cell(&cell2);
        assert!(result2.is_ok());
        
        match result2.unwrap() {
            CellOutput::Value(val) => assert_eq!(val, "20"),
            _ => panic!("Expected Value output"),
        }
    }
    
    /// TEST-003: Test NotebookTester struct initialization
    #[test]
    fn test_notebook_tester_initialization() {
        let tester = NotebookTester::new();
        assert_eq!(tester.cell_count(), 0);
        assert!(tester.get_state().is_empty());
        
        let config = TestConfig {
            tolerance: 1e-6,
            coverage: true,
            mutation: false,
            ..Default::default()
        };
        
        let tester_with_config = NotebookTester::with_config(config);
        assert_eq!(tester_with_config.config.tolerance, 1e-6);
        assert!(tester_with_config.config.coverage);
    }
}

#[cfg(test)]
mod test_golden_management {
    use super::*;
    
    /// TEST-005: Test golden output save and load
    #[test]
    fn test_save_and_load_golden_value() {
        let temp_dir = TempDir::new().unwrap();
        let manager = GoldenManager::new(temp_dir.path());
        
        let output = CellOutput::Value("42".to_string());
        let golden_path = PathBuf::from("test_golden.msgpack");
        
        // Save golden
        let save_result = manager.save_golden(&golden_path, &output);
        assert!(save_result.is_ok());
        
        // Load golden
        let loaded = manager.load_golden(&golden_path);
        assert!(loaded.is_ok());
        assert_eq!(loaded.unwrap(), output);
    }
    
    /// TEST-005: Test DataFrame golden with Parquet format
    #[test]
    fn test_save_dataframe_golden() {
        let temp_dir = TempDir::new().unwrap();
        let manager = GoldenManager::new(temp_dir.path());
        
        // Mock DataFrame output
        let df_output = CellOutput::DataFrame(DataFrameData {
            columns: vec!["col1".to_string(), "col2".to_string()],
            rows: vec![
                vec!["1".to_string(), "2".to_string()],
                vec!["3".to_string(), "4".to_string()],
            ],
        });
        
        let golden_path = PathBuf::from("df_golden.parquet");
        let result = manager.save_golden(&golden_path, &df_output);
        assert!(result.is_ok());
        
        // Verify file exists and is Parquet format
        let full_path = temp_dir.path().join(&golden_path);
        assert!(full_path.exists());
    }
}

#[cfg(test)]
mod test_deterministic_validation {
    use super::*;
    
    /// TEST-008: Test deterministic comparison with exact match
    #[test]
    fn test_deterministic_exact_match() {
        let tester = NotebookTester::new();
        let actual = CellOutput::Value("42".to_string());
        let expected = CellOutput::Value("42".to_string());
        
        let result = tester.compare_outputs(&actual, &expected, None);
        assert_eq!(result, TestResult::Pass);
    }
    
    /// TEST-009: Test tolerance-based numeric comparison
    #[test]
    fn test_numeric_comparison_with_tolerance() {
        let tester = NotebookTester::new();
        let actual = CellOutput::Value("3.14159".to_string());
        let expected = CellOutput::Value("3.14160".to_string());
        
        // Should pass with tolerance
        let result_pass = tester.compare_outputs(&actual, &expected, Some(1e-4));
        assert_eq!(result_pass, TestResult::Pass);
        
        // Should fail with stricter tolerance
        let result_fail = tester.compare_outputs(&actual, &expected, Some(1e-6));
        assert_eq!(result_fail, TestResult::NumericDivergence { 
            max_delta: 0.00001 
        });
    }
    
    /// TEST-008: Test DataFrame comparison
    #[test]
    fn test_dataframe_comparison() {
        let tester = NotebookTester::new();
        
        let df1 = CellOutput::DataFrame(DataFrameData {
            columns: vec!["a".to_string(), "b".to_string()],
            rows: vec![
                vec!["1".to_string(), "2.0".to_string()],
                vec!["3".to_string(), "4.0".to_string()],
            ],
        });
        
        let df2 = CellOutput::DataFrame(DataFrameData {
            columns: vec!["a".to_string(), "b".to_string()],
            rows: vec![
                vec!["1".to_string(), "2.0001".to_string()],
                vec!["3".to_string(), "4.0".to_string()],
            ],
        });
        
        // Should pass with tolerance
        let result = tester.compare_dataframes(&df1, &df2, 1e-3);
        assert_eq!(result, TestResult::Pass);
    }
}

#[cfg(test)]
mod test_state_management {
    use super::*;
    
    /// TEST-006: Test checkpoint and restore
    #[test]
    fn test_checkpoint_restore() {
        let mut session = NotebookTestSession::new();
        
        // Execute cell and create state
        session.execute_cell_str("let x = 42");
        
        // Create checkpoint
        let checkpoint_id = session.create_checkpoint("before_test");
        assert!(checkpoint_id.is_some());
        
        // Modify state
        session.execute_cell_str("let x = 100");
        
        // Restore checkpoint
        let restored = session.restore_checkpoint(&checkpoint_id.unwrap());
        assert!(restored);
        
        // Verify state was restored
        let result = session.execute_cell_str("x");
        match result {
            CellOutput::Value(val) => assert_eq!(val, "42"),
            _ => panic!("Expected original value after restore"),
        }
    }
    
    /// TEST-006: Test incremental state building
    #[test]
    fn test_incremental_notebook_execution() {
        let mut session = NotebookTestSession::new();
        let notebook = Notebook {
            cells: vec![
                Cell {
                    id: "c1".to_string(),
                    source: "let sum = 0".to_string(),
                    cell_type: CellType::Code,
                    metadata: CellMetadata::default(),
                },
                Cell {
                    id: "c2".to_string(),
                    source: "sum = sum + 10".to_string(),
                    cell_type: CellType::Code,
                    metadata: CellMetadata::default(),
                },
                Cell {
                    id: "c3".to_string(),
                    source: "sum = sum + 20".to_string(),
                    cell_type: CellType::Code,
                    metadata: CellMetadata::default(),
                },
                Cell {
                    id: "c4".to_string(),
                    source: "sum".to_string(),
                    cell_type: CellType::Code,
                    metadata: CellMetadata {
                        test: Some(CellTestMetadata {
                            test_type: CellTestType::Deterministic {
                                expected: "30".to_string(),
                                tolerance: None,
                            },
                        }),
                    },
                },
            ],
        };
        
        let report = session.run_notebook_test(&notebook);
        assert_eq!(report.results.len(), 1);
        assert_eq!(report.results[0], TestResult::Pass);
    }
}

#[cfg(test)]
mod test_coverage_tracking {
    use super::*;
    
    /// TEST-007: Test basic coverage tracking
    #[test]
    fn test_coverage_instrumentation() {
        let tracker = CoverageTracker::new();
        let cell = Cell {
            id: "coverage_cell".to_string(),
            source: r#"
                fun max(a, b) {
                    if a > b {
                        a
                    } else {
                        b
                    }
                }
            "#.to_string(),
            cell_type: CellType::Code,
            metadata: CellMetadata::default(),
        };
        
        let instrumented = tracker.instrument_cell(&cell);
        assert!(instrumented.probes.len() > 0);
        
        // Execute with one branch
        tracker.execute_instrumented(&instrumented, "max(5, 3)");
        let coverage = tracker.report_coverage();
        
        assert!(coverage.line_coverage > 0.0);
        assert!(coverage.branch_coverage < 1.0); // Not all branches covered
    }
}

#[cfg(test)]
mod test_report_generation {
    use super::*;
    
    /// TEST-010: Test comprehensive report generation
    #[test]
    fn test_generate_test_report() {
        let report = TestReport {
            total_tests: 10,
            passed_tests: 8,
            failed_tests: 2,
            skipped_tests: 0,
            execution_time: std::time::Duration::from_millis(1234),
            coverage: Some(CoverageReport {
                line_coverage: 0.87,
                branch_coverage: 0.72,
                uncovered_sections: vec!["function_foo:line_42".to_string()],
            }),
            failures: vec![
                TestFailure {
                    cell_id: "cell_3".to_string(),
                    expected: "100".to_string(),
                    actual: "99".to_string(),
                    message: "Numeric divergence".to_string(),
                },
            ],
        };
        
        let output = report.format_cli();
        assert!(output.contains("8 passed"));
        assert!(output.contains("2 failed"));
        assert!(output.contains("87%"));
        assert!(output.contains("1.234s"));
    }
    
    /// TEST-010: Test JSON report export
    #[test]
    fn test_json_report_export() {
        let report = TestReport {
            total_tests: 5,
            passed_tests: 5,
            failed_tests: 0,
            skipped_tests: 0,
            execution_time: std::time::Duration::from_millis(500),
            coverage: None,
            failures: vec![],
        };
        
        let json = report.to_json();
        assert!(json.is_ok());
        
        let json_str = json.unwrap();
        assert!(json_str.contains(r#""total_tests":5"#));
        assert!(json_str.contains(r#""passed_tests":5"#));
    }
}

// Property-based tests using quickcheck
#[cfg(test)]
mod property_tests {
    use super::*;
    use quickcheck::{quickcheck, TestResult as QCResult};
    
    /// Property: All valid notebooks should parse
    #[quickcheck]
    fn prop_valid_notebooks_parse(cells: Vec<String>) -> QCResult {
        if cells.is_empty() {
            return QCResult::discard();
        }
        
        let notebook = Notebook {
            cells: cells.into_iter().enumerate().map(|(i, source)| {
                Cell {
                    id: format!("cell_{}", i),
                    source,
                    cell_type: CellType::Code,
                    metadata: CellMetadata::default(),
                }
            }).collect(),
        };
        
        let parser = NotebookParser::new();
        QCResult::from_bool(parser.validate(&notebook).is_ok())
    }
    
    /// Property: Coverage is always between 0 and 1
    #[quickcheck]
    fn prop_coverage_bounds(covered: usize, total: usize) -> QCResult {
        if total == 0 {
            return QCResult::discard();
        }
        
        let coverage = covered as f64 / total as f64;
        QCResult::from_bool(coverage >= 0.0 && coverage <= 1.0)
    }
}