opencrabs 0.3.12

//! Plan Service
//!
//! Business logic for plan management operations.

use crate::db::repository::PlanRepository;
use crate::services::ServiceContext;
use crate::tui::plan::{PlanDocument, PlanStatus, TaskStatus};
use anyhow::Result;
use uuid::Uuid;

/// Validation warnings for a plan
#[derive(Debug, Clone)]
pub struct PlanValidationWarning {
    pub severity: WarningSeverity,
    pub message: String,
    pub suggestion: Option<String>,
}

/// Severity level for validation warnings
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum WarningSeverity {
    Info,
    Warning,
    Error,
}

/// Plan statistics for analytics
#[derive(Debug, Clone)]
pub struct PlanStatistics {
    pub total_plans: usize,
    pub completed_plans: usize,
    pub in_progress_plans: usize,
    pub average_tasks_per_plan: f64,
    pub average_completion_rate: f64,
    pub total_tasks_executed: usize,
    pub total_tasks_succeeded: usize,
    pub total_tasks_failed: usize,
}

/// Service for plan operations
#[derive(Clone)]
pub struct PlanService {
    repo: PlanRepository,
}

impl PlanService {
    /// Create a new plan service
    pub fn new(context: ServiceContext) -> Self {
        Self {
            repo: PlanRepository::new(context.pool()),
        }
    }

    /// Find plan by ID
    pub async fn find_by_id(&self, id: Uuid) -> Result<Option<PlanDocument>> {
        self.repo.find_by_id(id).await
    }

    /// Find all plans for a session
    pub async fn find_by_session_id(&self, session_id: Uuid) -> Result<Vec<PlanDocument>> {
        self.repo.find_by_session_id(session_id).await
    }

    /// Get the most recent plan for a session
    pub async fn get_most_recent_plan(&self, session_id: Uuid) -> Result<Option<PlanDocument>> {
        let plans = self.find_by_session_id(session_id).await?;
        // Plans are already sorted by updated_at DESC in the repository
        Ok(plans.into_iter().next())
    }

    /// Create a new plan
    pub async fn create(&self, plan: &PlanDocument) -> Result<()> {
        self.repo.create(plan).await
    }

    /// Update an existing plan
    pub async fn update(&self, plan: &PlanDocument) -> Result<()> {
        self.repo.update(plan).await
    }

    /// Delete a plan
    pub async fn delete(&self, id: Uuid) -> Result<()> {
        self.repo.delete(id).await
    }

    /// Save plan to JSON file as backup
    /// This is a fallback/export mechanism
    pub async fn export_to_json(
        &self,
        plan: &PlanDocument,
        file_path: &std::path::Path,
    ) -> Result<()> {
        let json = serde_json::to_string_pretty(plan)?;

        // Atomic write: write to temp file, then rename
        let temp_file = file_path.with_extension("tmp");
        tokio::fs::write(&temp_file, &json).await?;
        tokio::fs::rename(&temp_file, file_path).await?;

        Ok(())
    }

    /// Import plan from JSON file
    /// Used for migrating existing JSON plans to database
    pub async fn import_from_json(&self, file_path: &std::path::Path) -> Result<PlanDocument> {
        let content = tokio::fs::read_to_string(file_path).await?;
        let plan: PlanDocument = serde_json::from_str(&content)?;
        Ok(plan)
    }

    /// Validate a plan and return warnings
    pub fn validate_plan(&self, plan: &PlanDocument) -> Vec<PlanValidationWarning> {
        let mut warnings = Vec::new();

        // Check for overly complex tasks
        for task in &plan.tasks {
            if task.complexity >= 5 {
                warnings.push(PlanValidationWarning {
                    severity: WarningSeverity::Warning,
                    message: format!(
                        "Task '{}' has maximum complexity ({}★)",
                        task.title, task.complexity
                    ),
                    suggestion: Some(
                        "Consider breaking this task into smaller, more manageable subtasks."
                            .to_string(),
                    ),
                });
            }

            // Check for vague task descriptions
            if task.description.len() < 50 {
                warnings.push(PlanValidationWarning {
                    severity: WarningSeverity::Info,
                    message: format!(
                        "Task '{}' has a brief description ({} chars)",
                        task.title,
                        task.description.len()
                    ),
                    suggestion: Some(
                        "Add more detailed implementation steps for better clarity.".to_string(),
                    ),
                });
            }

            // Check for tasks with no acceptance criteria
            if task.acceptance_criteria.is_empty() {
                warnings.push(PlanValidationWarning {
                    severity: WarningSeverity::Info,
                    message: format!("Task '{}' has no acceptance criteria", task.title),
                    suggestion: Some(
                        "Define clear success criteria to know when the task is complete."
                            .to_string(),
                    ),
                });
            }
        }

        // Check for plans with too many tasks
        if plan.tasks.len() > 20 {
            warnings.push(PlanValidationWarning {
                severity: WarningSeverity::Warning,
                message: format!("Plan has {} tasks (>20)", plan.tasks.len()),
                suggestion: Some(
                    "Consider splitting into multiple smaller plans for better manageability."
                        .to_string(),
                ),
            });
        }

        // Check for empty plan
        if plan.tasks.is_empty() {
            warnings.push(PlanValidationWarning {
                severity: WarningSeverity::Error,
                message: "Plan has no tasks".to_string(),
                suggestion: Some("Add at least one task before finalizing the plan.".to_string()),
            });
        }

        // Check for missing context
        if plan.context.is_empty() {
            warnings.push(PlanValidationWarning {
                severity: WarningSeverity::Info,
                message: "Plan has no context information".to_string(),
                suggestion: Some(
                    "Add context about the environment, constraints, or assumptions.".to_string(),
                ),
            });
        }

        // Check for missing risks
        if plan.risks.is_empty() {
            warnings.push(PlanValidationWarning {
                severity: WarningSeverity::Info,
                message: "Plan has no identified risks".to_string(),
                suggestion: Some(
                    "Consider what could go wrong and document potential risks.".to_string(),
                ),
            });
        }

        warnings
    }

    /// Get plan history for a session (all plans, sorted by creation date)
    pub async fn get_plan_history(&self, session_id: Uuid) -> Result<Vec<PlanDocument>> {
        self.find_by_session_id(session_id).await
    }

    /// Get completed plans for a session
    pub async fn get_completed_plans(&self, session_id: Uuid) -> Result<Vec<PlanDocument>> {
        let plans = self.find_by_session_id(session_id).await?;
        Ok(plans
            .into_iter()
            .filter(|p| p.status == PlanStatus::Completed)
            .collect())
    }

    /// Get active (in-progress or pending approval) plans for a session
    pub async fn get_active_plans(&self, session_id: Uuid) -> Result<Vec<PlanDocument>> {
        let plans = self.find_by_session_id(session_id).await?;
        Ok(plans
            .into_iter()
            .filter(|p| {
                matches!(
                    p.status,
                    PlanStatus::InProgress | PlanStatus::PendingApproval | PlanStatus::Approved
                )
            })
            .collect())
    }

    /// Get statistics for plans in a session
    pub async fn get_statistics(&self, session_id: Uuid) -> Result<PlanStatistics> {
        let plans = self.find_by_session_id(session_id).await?;

        let total_plans = plans.len();
        let completed_plans = plans
            .iter()
            .filter(|p| p.status == PlanStatus::Completed)
            .count();
        let in_progress_plans = plans
            .iter()
            .filter(|p| p.status == PlanStatus::InProgress)
            .count();

        let total_tasks: usize = plans.iter().map(|p| p.tasks.len()).sum();
        let average_tasks_per_plan = if total_plans > 0 {
            total_tasks as f64 / total_plans as f64
        } else {
            0.0
        };

        let mut total_completion_rate = 0.0;
        let mut plans_with_tasks = 0;
        let mut total_tasks_succeeded = 0;
        let mut total_tasks_failed = 0;

        for plan in &plans {
            if !plan.tasks.is_empty() {
                total_completion_rate += plan.progress_percentage() as f64;
                plans_with_tasks += 1;
            }

            for task in &plan.tasks {
                match task.status {
                    TaskStatus::Completed => total_tasks_succeeded += 1,
                    TaskStatus::Failed => total_tasks_failed += 1,
                    _ => {}
                }
            }
        }

        let average_completion_rate = if plans_with_tasks > 0 {
            total_completion_rate / plans_with_tasks as f64
        } else {
            0.0
        };

        Ok(PlanStatistics {
            total_plans,
            completed_plans,
            in_progress_plans,
            average_tasks_per_plan,
            average_completion_rate,
            total_tasks_executed: total_tasks_succeeded + total_tasks_failed,
            total_tasks_succeeded,
            total_tasks_failed,
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::db::Database;
    use crate::db::models::Session;
    use crate::db::repository::session::SessionRepository;
    use crate::tui::plan::{PlanStatus, PlanTask, TaskStatus, TaskType};
    use tempfile::TempDir;

    /// Helper to create test database and service
    async fn setup_test_service() -> (Database, PlanService, Session, TempDir) {
        let db = Database::connect_in_memory()
            .await
            .expect("Failed to create database");
        db.run_migrations().await.expect("Failed to run migrations");

        let context = ServiceContext::new(db.pool().clone());
        let plan_service = PlanService::new(context.clone());

        // Create a test session (required for foreign key)
        let session_repo = SessionRepository::new(db.pool().clone());
        let session = Session::new(
            Some("Test Session".to_string()),
            Some("claude-sonnet-4-5".to_string()),
            None,
        );
        session_repo
            .create(&session)
            .await
            .expect("Failed to create test session");

        let temp_dir = TempDir::new().expect("Failed to create temp dir");

        (db, plan_service, session, temp_dir)
    }

    /// Helper to create a test plan
    fn create_test_plan(session_id: Uuid) -> PlanDocument {
        let mut plan = PlanDocument::new(
            session_id,
            "Test Plan".to_string(),
            "A test plan for service testing".to_string(),
        );

        plan.context = "Test context".to_string();
        plan.risks = vec!["Risk 1".to_string()];

        let task = PlanTask {
            id: Uuid::new_v4(),
            order: 0,
            title: "Task 1".to_string(),
            description: "First task".to_string(),
            task_type: TaskType::Research,
            dependencies: vec![],
            complexity: 3,
            acceptance_criteria: vec![],
            status: TaskStatus::Pending,
            notes: None,
            completed_at: None,
            execution_history: Vec::new(),
            retry_count: 0,
            max_retries: 3,
            artifacts: Vec::new(),
            reflection: None,
        };

        plan.add_task(task);
        plan
    }

    #[tokio::test]
    async fn test_service_create_and_find() {
        let (_db, service, session, _temp) = setup_test_service().await;

        let plan = create_test_plan(session.id);
        let plan_id = plan.id;

        // Create
        service.create(&plan).await.expect("Failed to create plan");

        // Find
        let found = service
            .find_by_id(plan_id)
            .await
            .expect("Failed to find plan");
        assert!(found.is_some());
        assert_eq!(found.unwrap().title, "Test Plan");
    }

    #[tokio::test]
    async fn test_service_update() {
        let (_db, service, session, _temp) = setup_test_service().await;

        let mut plan = create_test_plan(session.id);
        service.create(&plan).await.expect("Failed to create plan");

        // Update
        plan.title = "Updated Title".to_string();
        plan.status = PlanStatus::Approved;

        service.update(&plan).await.expect("Failed to update plan");

        // Verify
        let found = service
            .find_by_id(plan.id)
            .await
            .expect("Failed to find")
            .unwrap();
        assert_eq!(found.title, "Updated Title");
        assert_eq!(found.status, PlanStatus::Approved);
    }

    #[tokio::test]
    async fn test_service_delete() {
        let (_db, service, session, _temp) = setup_test_service().await;

        let plan = create_test_plan(session.id);
        service.create(&plan).await.expect("Failed to create plan");

        // Delete
        service
            .delete(plan.id)
            .await
            .expect("Failed to delete plan");

        // Verify deletion
        let found = service.find_by_id(plan.id).await.expect("Failed to query");
        assert!(found.is_none());
    }

    #[tokio::test]
    async fn test_service_find_by_session_id() {
        let (_db, service, session, _temp) = setup_test_service().await;

        // Create multiple plans
        let plan1 = create_test_plan(session.id);
        let plan2 = create_test_plan(session.id);

        service
            .create(&plan1)
            .await
            .expect("Failed to create plan1");
        tokio::time::sleep(tokio::time::Duration::from_millis(10)).await; // Ensure different timestamps
        service
            .create(&plan2)
            .await
            .expect("Failed to create plan2");

        // Find all plans for session
        let plans = service
            .find_by_session_id(session.id)
            .await
            .expect("Failed to find plans");
        assert_eq!(plans.len(), 2);
    }

    #[tokio::test]
    async fn test_service_get_most_recent_plan() {
        let (_db, service, session, _temp) = setup_test_service().await;

        // No plans yet
        let recent = service
            .get_most_recent_plan(session.id)
            .await
            .expect("Failed to get recent plan");
        assert!(recent.is_none());

        // Create first plan
        let plan1 = create_test_plan(session.id);
        let plan1_id = plan1.id;
        service
            .create(&plan1)
            .await
            .expect("Failed to create plan1");

        let recent = service
            .get_most_recent_plan(session.id)
            .await
            .expect("Failed to get recent plan");
        assert!(recent.is_some());
        assert_eq!(recent.unwrap().id, plan1_id);

        // Create second plan
        tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;
        let plan2 = create_test_plan(session.id);
        service
            .create(&plan2)
            .await
            .expect("Failed to create plan2");

        // Should return one of the plans (order tested in repository layer)
        let recent = service
            .get_most_recent_plan(session.id)
            .await
            .expect("Failed to get recent plan");
        assert!(recent.is_some());
        let recent_plan = recent.unwrap();
        // Verify it's one of our plans
        assert!(recent_plan.id == plan1_id || recent_plan.id == plan2.id);
    }

    #[tokio::test]
    async fn test_service_export_to_json() {
        let (_db, service, session, temp) = setup_test_service().await;

        let plan = create_test_plan(session.id);
        service.create(&plan).await.expect("Failed to create plan");

        // Export to JSON
        let json_path = temp.path().join("test_plan.json");
        service
            .export_to_json(&plan, &json_path)
            .await
            .expect("Failed to export to JSON");

        // Verify file exists
        assert!(json_path.exists());

        // Verify content is valid JSON
        let content = std::fs::read_to_string(&json_path).expect("Failed to read JSON file");
        let parsed: PlanDocument = serde_json::from_str(&content).expect("Invalid JSON");
        assert_eq!(parsed.id, plan.id);
        assert_eq!(parsed.title, plan.title);
    }

    #[tokio::test]
    async fn test_service_import_from_json() {
        let (_db, service, session, temp) = setup_test_service().await;

        let plan = create_test_plan(session.id);

        // Write JSON file
        let json_path = temp.path().join("test_plan.json");
        let json = serde_json::to_string_pretty(&plan).expect("Failed to serialize");
        std::fs::write(&json_path, json).expect("Failed to write JSON file");

        // Import from JSON
        let imported = service
            .import_from_json(&json_path)
            .await
            .expect("Failed to import from JSON");

        assert_eq!(imported.id, plan.id);
        assert_eq!(imported.title, plan.title);
        assert_eq!(imported.tasks.len(), plan.tasks.len());
    }

    #[tokio::test]
    async fn test_service_export_import_roundtrip() {
        let (_db, service, session, temp) = setup_test_service().await;

        let original_plan = create_test_plan(session.id);
        service
            .create(&original_plan)
            .await
            .expect("Failed to create plan");

        // Export
        let json_path = temp.path().join("roundtrip.json");
        service
            .export_to_json(&original_plan, &json_path)
            .await
            .expect("Failed to export");

        // Import
        let imported_plan = service
            .import_from_json(&json_path)
            .await
            .expect("Failed to import");

        // Verify data integrity
        assert_eq!(imported_plan.id, original_plan.id);
        assert_eq!(imported_plan.session_id, original_plan.session_id);
        assert_eq!(imported_plan.title, original_plan.title);
        assert_eq!(imported_plan.description, original_plan.description);
        assert_eq!(imported_plan.context, original_plan.context);
        assert_eq!(imported_plan.risks, original_plan.risks);
        assert_eq!(imported_plan.status, original_plan.status);
        assert_eq!(imported_plan.tasks.len(), original_plan.tasks.len());

        if let (Some(orig_task), Some(imp_task)) =
            (imported_plan.tasks.first(), original_plan.tasks.first())
        {
            assert_eq!(orig_task.id, imp_task.id);
            assert_eq!(orig_task.title, imp_task.title);
            assert_eq!(orig_task.task_type, imp_task.task_type);
        }
    }

    #[tokio::test]
    async fn test_service_atomic_json_write() {
        let (_db, service, session, temp) = setup_test_service().await;

        let plan = create_test_plan(session.id);
        let json_path = temp.path().join("atomic.json");

        // Export should use atomic write (write to .tmp, then rename)
        service
            .export_to_json(&plan, &json_path)
            .await
            .expect("Failed to export");

        // Verify temp file doesn't exist (should be renamed)
        let temp_file = temp.path().join("atomic.tmp");
        assert!(!temp_file.exists());

        // Verify target file exists
        assert!(json_path.exists());
    }

    #[tokio::test]
    async fn test_service_json_import_nonexistent_file() {
        let (_db, service, _session, temp) = setup_test_service().await;

        let json_path = temp.path().join("nonexistent.json");

        let result = service.import_from_json(&json_path).await;
        assert!(result.is_err());
    }

    #[tokio::test]
    async fn test_service_json_import_invalid_json() {
        let (_db, service, _session, temp) = setup_test_service().await;

        let json_path = temp.path().join("invalid.json");
        std::fs::write(&json_path, "{ invalid json }").expect("Failed to write file");

        let result = service.import_from_json(&json_path).await;
        assert!(result.is_err());
    }
}