// Document Management System - Chicago TDD Tests
// Comprehensive test suite with 550+ lines covering all DMS features

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

    // ========================================================================
    // DISCOVERY TESTS (Chicago School: Outside-in, interaction-based)
    // ========================================================================

    #[test]
    fn test_discover_document_creation_workflow() {
        // Arrange: Set up mock collaborators
        let mut store_mock = MockRDFStore::new();
        let mut metadata_service = MockMetadataService::new();
        let mut version_service = MockVersionService::new();

        // Expect: Document creation interactions
        store_mock
            .expect_insert_triple()
            .times(1)
            .with(eq("doc001"), eq("rdf:type"), eq("dms:Document"))
            .returning(|_, _, _| Ok(()));

        metadata_service
            .expect_attach_metadata()
            .times(1)
            .with(eq("doc001"), any())
            .returning(|_, _| Ok(()));

        version_service
            .expect_create_initial_version()
            .times(1)
            .with(eq("doc001"))
            .returning(|_| Ok("v1.0".to_string()));

        // Act: Create document
        let dms = DocumentManagementSystem::new(store_mock, metadata_service, version_service);
        let result = dms.create_document(CreateDocumentRequest {
            title: "Test Document".to_string(),
            filename: "test.docx".to_string(),
            content: vec![1, 2, 3],
        });

        // Assert: All interactions occurred
        assert!(result.is_ok());
        assert_eq!(result.unwrap().version, "v1.0");
    }

    #[test]
    fn test_discover_version_history_retrieval() {
        // Arrange
        let mut query_service = MockQueryService::new();
        query_service
            .expect_execute_sparql()
            .times(1)
            .with(contains("hasVersion"))
            .returning(|_| {
                Ok(vec![
                    VersionInfo {
                        version: "1.0".to_string(),
                        author: "alice@example.com".to_string(),
                        timestamp: "2025-01-08T10:00:00Z".to_string(),
                        is_current: true,
                    },
                    VersionInfo {
                        version: "0.9".to_string(),
                        author: "alice@example.com".to_string(),
                        timestamp: "2025-01-07T15:00:00Z".to_string(),
                        is_current: false,
                    },
                ])
            });

        // Act
        let dms = DocumentManagementSystem::new_with_query(query_service);
        let versions = dms.get_version_history("doc001");

        // Assert
        assert!(versions.is_ok());
        let versions = versions.unwrap();
        assert_eq!(versions.len(), 2);
        assert_eq!(versions[0].version, "1.0");
        assert!(versions[0].is_current);
    }

    #[test]
    fn test_discover_workflow_approval_chain() {
        // Arrange
        let mut workflow_service = MockWorkflowService::new();
        workflow_service
            .expect_create_approval_chain()
            .times(1)
            .with(eq("doc001"), eq(vec!["manager", "director", "ceo"]))
            .returning(|_, _| Ok("workflow001".to_string()));

        workflow_service
            .expect_notify_approver()
            .times(1)
            .with(eq("workflow001"), eq("manager"))
            .returning(|_, _| Ok(()));

        // Act
        let dms = DocumentManagementSystem::new_with_workflow(workflow_service);
        let result = dms.submit_for_approval("doc001", vec!["manager", "director", "ceo"]);

        // Assert
        assert!(result.is_ok());
    }

    #[test]
    fn test_discover_full_text_search() {
        // Arrange
        let mut search_service = MockSearchService::new();
        search_service
            .expect_index_document()
            .times(1)
            .with(eq("doc001"), any())
            .returning(|_, _| Ok(()));

        search_service
            .expect_search()
            .times(1)
            .with(eq("contract terms"))
            .returning(|_| {
                Ok(vec![
                    SearchResult {
                        doc_id: "doc001".to_string(),
                        title: "Employment Contract".to_string(),
                        snippet: "...contract terms include...".to_string(),
                        relevance: 0.95,
                    },
                ])
            });

        // Act
        let dms = DocumentManagementSystem::new_with_search(search_service);
        let results = dms.search("contract terms");

        // Assert
        assert!(results.is_ok());
        let results = results.unwrap();
        assert_eq!(results.len(), 1);
        assert!(results[0].relevance > 0.9);
    }

    #[test]
    fn test_discover_ocr_processing() {
        // Arrange
        let mut ocr_service = MockOCRService::new();
        ocr_service
            .expect_extract_text()
            .times(1)
            .with(eq("doc001"))
            .returning(|_| {
                Ok(OCRResult {
                    text: "Extracted document text".to_string(),
                    confidence: 0.92,
                    language: "en".to_string(),
                })
            });

        // Act
        let dms = DocumentManagementSystem::new_with_ocr(ocr_service);
        let result = dms.process_ocr("doc001");

        // Assert
        assert!(result.is_ok());
        let ocr = result.unwrap();
        assert!(ocr.confidence > 0.85);
        assert_eq!(ocr.language, "en");
    }

    #[test]
    fn test_discover_permission_enforcement() {
        // Arrange
        let mut permission_service = MockPermissionService::new();
        permission_service
            .expect_check_permission()
            .times(1)
            .with(eq("user001"), eq("doc001"), eq(Permission::Read))
            .returning(|_, _, _| Ok(true));

        permission_service
            .expect_check_permission()
            .times(1)
            .with(eq("user001"), eq("doc001"), eq(Permission::Write))
            .returning(|_, _, _| Ok(false));

        // Act
        let dms = DocumentManagementSystem::new_with_permissions(permission_service);
        let can_read = dms.can_access("user001", "doc001", Permission::Read);
        let can_write = dms.can_access("user001", "doc001", Permission::Write);

        // Assert
        assert!(can_read.unwrap());
        assert!(!can_write.unwrap());
    }

    #[test]
    fn test_discover_retention_policy_enforcement() {
        // Arrange
        let mut retention_service = MockRetentionService::new();
        retention_service
            .expect_apply_policy()
            .times(1)
            .with(eq("doc001"), any())
            .returning(|_, _| {
                Ok(RetentionInfo {
                    policy_id: "policy001".to_string(),
                    retention_period: "7 years".to_string(),
                    disposition_date: "2032-01-08".to_string(),
                })
            });

        retention_service
            .expect_check_legal_hold()
            .times(1)
            .with(eq("doc001"))
            .returning(|_| Ok(false));

        // Act
        let dms = DocumentManagementSystem::new_with_retention(retention_service);
        let retention = dms.apply_retention("doc001", "financial_records");

        // Assert
        assert!(retention.is_ok());
        assert_eq!(retention.unwrap().retention_period, "7 years");
    }

    #[test]
    fn test_discover_audit_logging() {
        // Arrange
        let mut audit_service = MockAuditService::new();
        audit_service
            .expect_log_action()
            .times(3)
            .returning(|_, _, _| Ok(()));

        // Act
        let dms = DocumentManagementSystem::new_with_audit(audit_service);
        dms.log_access("user001", "doc001", "view");
        dms.log_access("user001", "doc001", "download");
        dms.log_access("user002", "doc001", "edit");

        // Assert: Verify all audit logs created via mock expectations
    }

    // ========================================================================
    // BOUNDARY TESTS (Edge cases and validation)
    // ========================================================================

    #[test]
    fn test_boundary_empty_document_title() {
        let dms = DocumentManagementSystem::new_default();
        let result = dms.create_document(CreateDocumentRequest {
            title: "".to_string(),
            filename: "test.docx".to_string(),
            content: vec![],
        });

        assert!(result.is_err());
        assert!(matches!(result.unwrap_err(), DMSError::InvalidTitle));
    }

    #[test]
    fn test_boundary_maximum_filename_length() {
        let dms = DocumentManagementSystem::new_default();
        let long_filename = "a".repeat(256) + ".docx";
        let result = dms.create_document(CreateDocumentRequest {
            title: "Test".to_string(),
            filename: long_filename,
            content: vec![],
        });

        assert!(result.is_err());
        assert!(matches!(result.unwrap_err(), DMSError::FilenameTooLong));
    }

    #[test]
    fn test_boundary_version_number_overflow() {
        let dms = DocumentManagementSystem::new_default();
        let result = dms.create_version("doc001", 999999.9);

        assert!(result.is_ok());
    }

    #[test]
    fn test_boundary_permission_multiple_users() {
        let mut permission_service = MockPermissionService::new();
        permission_service
            .expect_grant_permission()
            .times(100)
            .returning(|_, _, _| Ok(()));

        let dms = DocumentManagementSystem::new_with_permissions(permission_service);

        for i in 0..100 {
            let result = dms.grant_permission(&format!("user{:03}", i), "doc001", Permission::Read);
            assert!(result.is_ok());
        }
    }

    #[test]
    fn test_boundary_large_document_content() {
        let dms = DocumentManagementSystem::new_default();
        let large_content = vec![0u8; 100 * 1024 * 1024]; // 100 MB

        let result = dms.create_document(CreateDocumentRequest {
            title: "Large Document".to_string(),
            filename: "large.bin".to_string(),
            content: large_content,
        });

        assert!(result.is_ok());
    }

    #[test]
    fn test_boundary_concurrent_version_creation() {
        use std::sync::{Arc, Mutex};
        use std::thread;

        let dms = Arc::new(Mutex::new(DocumentManagementSystem::new_default()));
        let mut handles = vec![];

        for i in 0..10 {
            let dms_clone = Arc::clone(&dms);
            let handle = thread::spawn(move || {
                let dms = dms_clone.lock().unwrap();
                dms.create_version("doc001", (i as f64) / 10.0)
            });
            handles.push(handle);
        }

        for handle in handles {
            assert!(handle.join().is_ok());
        }
    }

    // ========================================================================
    // INTEGRATION TESTS (End-to-end workflows)
    // ========================================================================

    #[test]
    fn test_integration_complete_document_lifecycle() {
        let dms = DocumentManagementSystem::new_default();

        // 1. Create document
        let doc = dms.create_document(CreateDocumentRequest {
            title: "Integration Test Doc".to_string(),
            filename: "test.docx".to_string(),
            content: b"Test content".to_vec(),
        }).unwrap();

        // 2. Update document (new version)
        let v2 = dms.update_document(&doc.id, b"Updated content".to_vec()).unwrap();
        assert_eq!(v2.version, "2.0");

        // 3. Submit for approval
        dms.submit_for_approval(&doc.id, vec!["manager"]).unwrap();

        // 4. Approve
        dms.approve(&doc.id, "manager").unwrap();

        // 5. Apply retention policy
        dms.apply_retention(&doc.id, "standard").unwrap();

        // 6. Verify final state
        let final_doc = dms.get_document(&doc.id).unwrap();
        assert_eq!(final_doc.workflow_status, "approved");
        assert!(final_doc.retention_policy.is_some());
    }

    #[test]
    fn test_integration_search_and_retrieve() {
        let dms = DocumentManagementSystem::new_default();

        // Create multiple documents
        for i in 0..5 {
            dms.create_document(CreateDocumentRequest {
                title: format!("Contract {}", i),
                filename: format!("contract{}.pdf", i),
                content: format!("This is contract number {}", i).into_bytes(),
            }).unwrap();
        }

        // Search for documents
        let results = dms.search("contract").unwrap();
        assert_eq!(results.len(), 5);

        // Retrieve specific document
        let doc = dms.get_document(&results[0].doc_id).unwrap();
        assert!(doc.title.contains("Contract"));
    }

    #[test]
    fn test_integration_permission_inheritance() {
        let dms = DocumentManagementSystem::new_default();

        // Create folder with permissions
        let folder = dms.create_folder("/projects", vec!["team_lead"]).unwrap();

        // Create document in folder
        let doc = dms.create_document_in_folder(&folder.id, CreateDocumentRequest {
            title: "Project Doc".to_string(),
            filename: "project.docx".to_string(),
            content: vec![],
        }).unwrap();

        // Verify permission inheritance
        let can_access = dms.can_access("team_lead", &doc.id, Permission::Read).unwrap();
        assert!(can_access);
    }

    // ========================================================================
    // PERFORMANCE TESTS
    // ========================================================================

    #[test]
    fn test_performance_bulk_document_creation() {
        use std::time::Instant;

        let dms = DocumentManagementSystem::new_default();
        let start = Instant::now();

        for i in 0..1000 {
            dms.create_document(CreateDocumentRequest {
                title: format!("Doc {}", i),
                filename: format!("doc{}.txt", i),
                content: vec![0u8; 1024],
            }).unwrap();
        }

        let duration = start.elapsed();
        assert!(duration.as_secs() < 10, "Bulk creation took too long: {:?}", duration);
    }

    #[test]
    fn test_performance_version_history_query() {
        use std::time::Instant;

        let dms = DocumentManagementSystem::new_default();
        let doc = dms.create_document(CreateDocumentRequest {
            title: "Test".to_string(),
            filename: "test.txt".to_string(),
            content: vec![],
        }).unwrap();

        // Create 100 versions
        for i in 0..100 {
            dms.update_document(&doc.id, format!("Version {}", i).into_bytes()).unwrap();
        }

        // Query performance
        let start = Instant::now();
        let versions = dms.get_version_history(&doc.id).unwrap();
        let duration = start.elapsed();

        assert_eq!(versions.len(), 101); // Original + 100 updates
        assert!(duration.as_millis() < 100, "Version query too slow: {:?}", duration);
    }
}

// ============================================================================
// MOCK IMPLEMENTATIONS (Chicago TDD: Test doubles for collaborators)
// ============================================================================

use mockall::*;

#[automock]
trait RDFStore {
    fn insert_triple(&mut self, subject: &str, predicate: &str, object: &str) -> Result<(), DMSError>;
    fn query(&self, sparql: &str) -> Result<Vec<Triple>, DMSError>;
}

#[automock]
trait MetadataService {
    fn attach_metadata(&mut self, doc_id: &str, metadata: Metadata) -> Result<(), DMSError>;
}

#[automock]
trait VersionService {
    fn create_initial_version(&mut self, doc_id: &str) -> Result<String, DMSError>;
}

#[automock]
trait QueryService {
    fn execute_sparql(&self, query: &str) -> Result<Vec<VersionInfo>, DMSError>;
}

#[automock]
trait WorkflowService {
    fn create_approval_chain(&mut self, doc_id: &str, approvers: Vec<&str>) -> Result<String, DMSError>;
    fn notify_approver(&mut self, workflow_id: &str, approver: &str) -> Result<(), DMSError>;
}

#[automock]
trait SearchService {
    fn index_document(&mut self, doc_id: &str, content: &str) -> Result<(), DMSError>;
    fn search(&self, query: &str) -> Result<Vec<SearchResult>, DMSError>;
}

#[automock]
trait OCRService {
    fn extract_text(&self, doc_id: &str) -> Result<OCRResult, DMSError>;
}

#[automock]
trait PermissionService {
    fn check_permission(&self, user: &str, doc: &str, perm: Permission) -> Result<bool, DMSError>;
    fn grant_permission(&mut self, user: &str, doc: &str, perm: Permission) -> Result<(), DMSError>;
}

#[automock]
trait RetentionService {
    fn apply_policy(&mut self, doc_id: &str, policy: &str) -> Result<RetentionInfo, DMSError>;
    fn check_legal_hold(&self, doc_id: &str) -> Result<bool, DMSError>;
}

#[automock]
trait AuditService {
    fn log_action(&mut self, user: &str, doc: &str, action: &str) -> Result<(), DMSError>;
}

// Supporting types
#[derive(Debug, Clone)]
struct CreateDocumentRequest {
    title: String,
    filename: String,
    content: Vec<u8>,
}

#[derive(Debug)]
struct VersionInfo {
    version: String,
    author: String,
    timestamp: String,
    is_current: bool,
}

#[derive(Debug)]
struct SearchResult {
    doc_id: String,
    title: String,
    snippet: String,
    relevance: f64,
}

#[derive(Debug)]
struct OCRResult {
    text: String,
    confidence: f64,
    language: String,
}

#[derive(Debug, PartialEq)]
enum Permission {
    Read,
    Write,
    Delete,
    Share,
}

#[derive(Debug)]
struct RetentionInfo {
    policy_id: String,
    retention_period: String,
    disposition_date: String,
}

#[derive(Debug)]
enum DMSError {
    InvalidTitle,
    FilenameTooLong,
    NotFound,
    PermissionDenied,
}

struct DocumentManagementSystem;

impl DocumentManagementSystem {
    fn new_default() -> Self {
        Self
    }

    fn new_with_query(_query_service: MockQueryService) -> Self {
        Self
    }

    fn new_with_workflow(_workflow_service: MockWorkflowService) -> Self {
        Self
    }

    fn new_with_search(_search_service: MockSearchService) -> Self {
        Self
    }

    fn new_with_ocr(_ocr_service: MockOCRService) -> Self {
        Self
    }

    fn new_with_permissions(_permission_service: MockPermissionService) -> Self {
        Self
    }

    fn new_with_retention(_retention_service: MockRetentionService) -> Self {
        Self
    }

    fn new_with_audit(_audit_service: MockAuditService) -> Self {
        Self
    }
}
