//! WASM-compatible storage using browser LocalStorage

use crate::domain::entities::*;
use crate::domain::error::DomainError;
use crate::domain::traits::*;

/// WASM storage using browser LocalStorage
#[derive(Clone)]
pub struct BrowserStorage;

// Mock storage for testing on native targets
#[cfg(not(target_arch = "wasm32"))]
use std::collections::HashMap;
#[cfg(not(target_arch = "wasm32"))]
use std::sync::{Mutex, OnceLock};

#[cfg(not(target_arch = "wasm32"))]
static MOCK_STORAGE: OnceLock<Mutex<HashMap<String, String>>> = OnceLock::new();

impl FileStorage for BrowserStorage {
    type Error = DomainError;

    fn save(&self, file: &PassportFile, path: &str) -> Result<(), Self::Error> {
        // Real implementation for WASM targets
        #[cfg(target_arch = "wasm32")]
        {
            use base64::Engine;
            use gloo_storage::Storage;

            // Serialize to CBOR
            let data = serde_cbor::to_vec(file)
                .map_err(|e| DomainError::InvalidFileFormat(format!("Failed to serialize file: {}", e)))?;

            // Convert to base64 for storage
            let base64_data = base64::engine::general_purpose::STANDARD.encode(&data);

            // Store in browser localStorage using gloo-storage (synchronous)
            gloo_storage::LocalStorage::set(path, base64_data)
                .map_err(|e| DomainError::InvalidFileFormat(format!("Failed to store in localStorage: {}", e)))?;

            Ok(())
        }

        // Mock implementation for testing on native targets
        #[cfg(not(target_arch = "wasm32"))]
        {
            // For testing purposes, we'll use a simple in-memory storage
            // In a real browser environment, this would use actual localStorage
            use base64::Engine;

            // Serialize to CBOR
            let data = serde_cbor::to_vec(file)
                .map_err(|e| DomainError::InvalidFileFormat(format!("Failed to serialize file: {}", e)))?;

            // Convert to base64 for storage
            let base64_data = base64::engine::general_purpose::STANDARD.encode(&data);

            // Store in mock storage
            let mock_storage = MOCK_STORAGE.get_or_init(|| Mutex::new(HashMap::new()));
            mock_storage.lock().unwrap().insert(path.to_string(), base64_data);

            Ok(())
        }
    }

    fn load(&self, path: &str) -> Result<PassportFile, Self::Error> {
        // Real implementation for WASM targets
        #[cfg(target_arch = "wasm32")]
        {
            use base64::Engine;
            use gloo_storage::Storage;

            // Load from browser localStorage (synchronous)
            let base64_data: String = gloo_storage::LocalStorage::get(path)
                .map_err(|e| DomainError::InvalidFileFormat(format!("Failed to load from localStorage: {}", e)))?;

            // Decode from base64
            let data = base64::engine::general_purpose::STANDARD.decode(&base64_data)
                .map_err(|e| DomainError::InvalidFileFormat(format!("Failed to decode base64: {}", e)))?;

            // Deserialize from CBOR
            let file = serde_cbor::from_slice(&data)
                .map_err(|e| DomainError::InvalidFileFormat(format!("Failed to deserialize file: {}", e)))?;

            Ok(file)
        }

        // Mock implementation for testing on native targets
        #[cfg(not(target_arch = "wasm32"))]
        {
            use base64::Engine;

            // Load from mock storage
            let mock_storage = MOCK_STORAGE.get_or_init(|| Mutex::new(HashMap::new()));
            let mock_storage = mock_storage.lock().unwrap();
            let base64_data = mock_storage.get(path)
                .ok_or_else(|| DomainError::InvalidFileFormat(format!("Key not found: {}", path)))?;

            // Decode from base64
            let data = base64::engine::general_purpose::STANDARD.decode(base64_data)
                .map_err(|e| DomainError::InvalidFileFormat(format!("Failed to decode base64: {}", e)))?;

            // Deserialize from CBOR
            let file = serde_cbor::from_slice(&data)
                .map_err(|e| DomainError::InvalidFileFormat(format!("Failed to deserialize file: {}", e)))?;

            Ok(file)
        }
    }
}