//! Database PyO3 wrapper (main API).

use pyo3::prelude::*;
use pyo3::types::PyDict;
use crate::types::Result;

/// Python wrapper for Database.
///
/// Exposes high-level API to Python with automatic type conversions.
#[pyclass(name = "Database")]
pub struct PyDatabase {
    // TODO: Internal Rust database instance
}

#[pymethods]
impl PyDatabase {
    /// Create new database.
    ///
    /// # Arguments
    ///
    /// * `path` - Database directory path
    /// * `tenant_id` - Tenant identifier
    ///
    /// # Returns
    ///
    /// New `PyDatabase` instance
    #[new]
    fn new(path: String, tenant_id: String) -> PyResult<Self> {
        todo!("Implement PyDatabase::new")
    }

    /// Register schema from JSON.
    ///
    /// # Arguments
    ///
    /// * `name` - Schema name
    /// * `schema_json` - JSON Schema string
    fn register_schema(&mut self, name: String, schema_json: String) -> PyResult<()> {
        todo!("Implement PyDatabase::register_schema")
    }

    /// Insert entity.
    ///
    /// # Arguments
    ///
    /// * `table` - Table/schema name
    /// * `data` - Entity data (Python dict)
    ///
    /// # Returns
    ///
    /// Entity UUID as string
    fn insert(&self, table: String, data: &PyDict) -> PyResult<String> {
        todo!("Implement PyDatabase::insert")
    }

    /// Batch insert entities.
    ///
    /// # Arguments
    ///
    /// * `table` - Table/schema name
    /// * `entities` - List of entity dicts
    ///
    /// # Returns
    ///
    /// List of entity UUIDs
    fn insert_batch(&self, table: String, entities: Vec<&PyDict>) -> PyResult<Vec<String>> {
        todo!("Implement PyDatabase::insert_batch")
    }

    /// Get entity by ID.
    ///
    /// # Arguments
    ///
    /// * `entity_id` - Entity UUID string
    ///
    /// # Returns
    ///
    /// Entity dict or None
    fn get(&self, entity_id: String) -> PyResult<Option<PyObject>> {
        todo!("Implement PyDatabase::get")
    }

    /// Lookup entity by key.
    ///
    /// # Arguments
    ///
    /// * `key_value` - Key field value
    ///
    /// # Returns
    ///
    /// List of matching entities
    fn lookup(&self, key_value: String) -> PyResult<Vec<PyObject>> {
        todo!("Implement PyDatabase::lookup")
    }

    /// Search entities by semantic similarity.
    ///
    /// # Arguments
    ///
    /// * `query` - Search query text
    /// * `schema` - Schema name to search
    /// * `top_k` - Number of results
    ///
    /// # Returns
    ///
    /// List of (entity, score) tuples
    fn search(&self, query: String, schema: String, top_k: usize) -> PyResult<Vec<PyObject>> {
        todo!("Implement PyDatabase::search")
    }

    /// Execute SQL query.
    ///
    /// # Arguments
    ///
    /// * `sql` - SQL query string
    ///
    /// # Returns
    ///
    /// List of matching entities
    fn query(&self, sql: String) -> PyResult<Vec<PyObject>> {
        todo!("Implement PyDatabase::query")
    }

    /// Execute natural language query.
    ///
    /// # Arguments
    ///
    /// * `question` - Natural language question
    /// * `execute` - Execute query or just plan
    ///
    /// # Returns
    ///
    /// Query results or plan
    fn ask(&self, question: String, execute: bool) -> PyResult<PyObject> {
        todo!("Implement PyDatabase::ask")
    }

    /// Graph traversal from entity.
    ///
    /// # Arguments
    ///
    /// * `start_id` - Starting entity UUID
    /// * `direction` - Traversal direction ("out", "in", "both")
    /// * `depth` - Maximum depth
    ///
    /// # Returns
    ///
    /// List of entity UUIDs
    fn traverse(&self, start_id: String, direction: String, depth: usize) -> PyResult<Vec<String>> {
        todo!("Implement PyDatabase::traverse")
    }

    /// Export entities to file.
    ///
    /// # Arguments
    ///
    /// * `table` - Table name
    /// * `path` - Output file path
    /// * `format` - Export format ("parquet", "csv", "jsonl")
    fn export(&self, table: String, path: String, format: String) -> PyResult<()> {
        todo!("Implement PyDatabase::export")
    }

    /// Ingest document file.
    ///
    /// # Arguments
    ///
    /// * `file_path` - Document file path
    /// * `schema` - Target schema name
    ///
    /// # Returns
    ///
    /// List of created entity UUIDs
    fn ingest(&self, file_path: String, schema: String) -> PyResult<Vec<String>> {
        todo!("Implement PyDatabase::ingest")
    }

    /// Close database.
    fn close(&mut self) -> PyResult<()> {
        todo!("Implement PyDatabase::close")
    }
}
