lc-cli 0.1.3

//! Provider configuration installer and manager
//!
//! This module handles downloading, installing, and updating provider configurations
//! from a central repository, keeping API keys separate from the configurations.

use anyhow::Result;
use colored::Colorize;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fs;
use std::path::PathBuf;

/// Provider registry that lists available providers and their metadata
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ProviderRegistry {
    /// Version of the registry format
    pub version: String,

    /// List of available providers
    pub providers: HashMap<String, ProviderMetadata>,

    /// Base URL for downloading provider configs
    pub base_url: String,
}

/// Metadata about a provider
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ProviderMetadata {
    /// Display name of the provider
    pub name: String,

    /// Description of the provider
    pub description: String,

    /// Provider configuration file name
    pub config_file: String,

    /// Version of the provider config
    pub version: String,

    /// Required authentication type
    pub auth_type: AuthType,

    /// Tags for categorization
    #[serde(default)]
    pub tags: Vec<String>,

    /// Whether this provider is officially supported
    #[serde(default)]
    pub official: bool,

    /// Documentation URL
    #[serde(skip_serializing_if = "Option::is_none")]
    pub docs_url: Option<String>,

    /// Minimum lc version required
    #[serde(skip_serializing_if = "Option::is_none")]
    pub min_version: Option<String>,
}

/// Types of authentication required by providers
#[derive(Debug, Serialize, Deserialize, Clone)]
#[serde(rename_all = "snake_case")]
pub enum AuthType {
    ApiKey,
    ServiceAccount,
    OAuth,
    Token,
    Headers,
    None,
}

/// Provider installer that manages downloading and installing provider configs
pub struct ProviderInstaller {
    /// Registry URL or local path
    registry_source: String,

    /// Cache directory for downloaded configs
    cache_dir: PathBuf,

    /// Target directory for installed providers
    providers_dir: PathBuf,
}

impl ProviderInstaller {
    /// Create a new provider installer
    pub fn new() -> Result<Self> {
        let config_dir = crate::config::Config::config_dir()?;
        let cache_dir = config_dir.join(".provider_cache");
        let providers_dir = config_dir.join("providers");

        // Default to GitHub repository
        let registry_source = std::env::var("LC_PROVIDER_REGISTRY").unwrap_or_else(|_| {
            "https://raw.githubusercontent.com/rajashekar/lc-providers/main".to_string()
        });

        Ok(Self {
            registry_source,
            cache_dir,
            providers_dir,
        })
    }

    /// Fetch the provider registry
    pub async fn fetch_registry(&self) -> Result<ProviderRegistry> {
        let registry_url = format!("{}/registry.json", self.registry_source);

        crate::debug_log!("Fetching provider registry from: {}", registry_url);

        // Handle local file paths
        if registry_url.starts_with("file://") {
            let path = registry_url
                .strip_prefix("file://")
                .ok_or_else(|| anyhow::anyhow!("Invalid file:// URL format"))?;
            let content = fs::read_to_string(path)
                .map_err(|e| anyhow::anyhow!("Failed to read local registry: {}", e))?;
            let registry: ProviderRegistry = serde_json::from_str(&content)
                .map_err(|e| anyhow::anyhow!("Failed to parse registry: {}", e))?;

            // Cache the registry locally
            self.cache_registry(&registry)?;

            return Ok(registry);
        }

        // Create HTTP client for remote URLs
        let client = reqwest::Client::builder()
            .timeout(std::time::Duration::from_secs(30))
            .build()?;

        let response = client
            .get(&registry_url)
            .send()
            .await
            .map_err(|e| anyhow::anyhow!("Failed to fetch registry: {}", e))?;

        if !response.status().is_success() {
            anyhow::bail!("Failed to fetch registry: HTTP {}", response.status());
        }

        let registry: ProviderRegistry = response
            .json()
            .await
            .map_err(|e| anyhow::anyhow!("Failed to parse registry: {}", e))?;

        // Cache the registry locally
        self.cache_registry(&registry)?;

        Ok(registry)
    }

    /// Get cached registry if available
    pub fn get_cached_registry(&self) -> Result<Option<ProviderRegistry>> {
        let cache_file = self.cache_dir.join("registry.json");

        if !cache_file.exists() {
            return Ok(None);
        }

        // Check if cache is fresh (less than 24 hours old)
        let metadata = fs::metadata(&cache_file)?;
        if let Ok(modified) = metadata.modified() {
            let age = std::time::SystemTime::now()
                .duration_since(modified)
                .unwrap_or(std::time::Duration::MAX);

            if age > std::time::Duration::from_secs(24 * 60 * 60) {
                crate::debug_log!("Registry cache is stale (>24 hours old)");
                return Ok(None);
            }
        }

        let content = fs::read_to_string(&cache_file)?;
        let registry: ProviderRegistry = serde_json::from_str(&content)?;

        Ok(Some(registry))
    }

    /// Cache the registry locally
    fn cache_registry(&self, registry: &ProviderRegistry) -> Result<()> {
        fs::create_dir_all(&self.cache_dir)?;

        let cache_file = self.cache_dir.join("registry.json");
        let content = serde_json::to_string_pretty(registry)?;
        fs::write(&cache_file, content)?;

        Ok(())
    }

    /// List available providers
    pub async fn list_available(&self) -> Result<Vec<(String, ProviderMetadata)>> {
        // Try cached registry first
        let registry = if let Some(cached) = self.get_cached_registry()? {
            cached
        } else {
            self.fetch_registry().await?
        };

        let mut providers: Vec<_> = registry.providers.into_iter().collect();
        providers.sort_by(|a, b| a.0.cmp(&b.0));

        Ok(providers)
    }

    /// Install a provider configuration
    pub async fn install_provider(&self, provider_id: &str, force: bool) -> Result<()> {
        println!("{} Installing provider '{}'...", "📦".blue(), provider_id);

        // Fetch registry
        let registry = if let Some(cached) = self.get_cached_registry()? {
            cached
        } else {
            println!("{} Fetching provider registry...", "🔄".blue());
            self.fetch_registry().await?
        };

        // Find provider metadata
        let metadata = registry
            .providers
            .get(provider_id)
            .ok_or_else(|| anyhow::anyhow!("Provider '{}' not found in registry", provider_id))?;

        // Check if already installed
        let target_file = self.providers_dir.join(&metadata.config_file);
        if target_file.exists() && !force {
            // Check version
            if let Ok(existing_config) = fs::read_to_string(&target_file) {
                if let Ok(existing_toml) = toml::from_str::<toml::Value>(&existing_config) {
                    if let Some(existing_version) =
                        existing_toml.get("version").and_then(|v| v.as_str())
                    {
                        if existing_version == metadata.version {
                            println!(
                                "{} Provider '{}' is already up to date (v{})",
                                "✓".green(),
                                provider_id,
                                metadata.version
                            );
                            return Ok(());
                        }
                    }
                }
            }

            println!(
                "{} Provider '{}' already exists. Updating to v{}...",
                "🔄".yellow(),
                provider_id,
                metadata.version
            );
        }

        // Download provider config
        let config_url = format!("{}/providers/{}", registry.base_url, metadata.config_file);

        crate::debug_log!("Downloading provider config from: {}", config_url);

        let config_content = if config_url.starts_with("file://") {
            // Handle local file
            let path = config_url
                .strip_prefix("file://")
                .ok_or_else(|| anyhow::anyhow!("Invalid file:// URL format"))?;
            fs::read_to_string(path)
                .map_err(|e| anyhow::anyhow!("Failed to read local provider config: {}", e))?
        } else {
            // Handle remote URL
            let client = reqwest::Client::builder()
                .timeout(std::time::Duration::from_secs(30))
                .build()?;

            let response = client
                .get(&config_url)
                .send()
                .await
                .map_err(|e| anyhow::anyhow!("Failed to download provider config: {}", e))?;

            if !response.status().is_success() {
                anyhow::bail!(
                    "Failed to download provider config: HTTP {}",
                    response.status()
                );
            }

            response.text().await?
        };

        // Validate the downloaded config
        self.validate_provider_config(&config_content)?;

        // Ensure providers directory exists
        fs::create_dir_all(&self.providers_dir)?;

        // Write the provider config
        fs::write(&target_file, &config_content)?;

        println!(
            "{} Provider '{}' installed successfully (v{})",
            "✅".green(),
            provider_id,
            metadata.version
        );

        // Show authentication instructions
        self.show_auth_instructions(provider_id, metadata)?;

        Ok(())
    }

    /// Update a provider configuration
    pub async fn update_provider(&self, provider_id: &str) -> Result<()> {
        self.install_provider(provider_id, true).await
    }

    /// Update all installed providers
    pub async fn update_all_providers(&self) -> Result<()> {
        println!("{} Updating all installed providers...", "🔄".blue());

        // Get list of installed providers
        let installed = self.list_installed_providers()?;

        if installed.is_empty() {
            println!("{} No providers installed", "ℹ️".blue());
            return Ok(());
        }

        let mut updated_count = 0;
        let mut failed_count = 0;

        for provider_id in installed {
            match self.update_provider(&provider_id).await {
                Ok(_) => updated_count += 1,
                Err(e) => {
                    eprintln!("{} Failed to update '{}': {}", "❌".red(), provider_id, e);
                    failed_count += 1;
                }
            }
        }

        if failed_count == 0 {
            println!(
                "{} All {} providers updated successfully",
                "✅".green(),
                updated_count
            );
        } else {
            println!(
                "{} Updated {} providers, {} failed",
                "⚠️".yellow(),
                updated_count,
                failed_count
            );
        }

        Ok(())
    }

    /// List installed providers
    pub fn list_installed_providers(&self) -> Result<Vec<String>> {
        if !self.providers_dir.exists() {
            return Ok(Vec::new());
        }

        let mut providers = Vec::new();

        for entry in fs::read_dir(&self.providers_dir)? {
            let entry = entry?;
            let path = entry.path();

            if path.extension().and_then(|s| s.to_str()) == Some("toml") {
                if let Some(name) = path.file_stem().and_then(|s| s.to_str()) {
                    providers.push(name.to_string());
                }
            }
        }

        providers.sort();
        Ok(providers)
    }

    /// Remove an installed provider
    pub fn uninstall_provider(&self, provider_id: &str) -> Result<()> {
        let provider_file = self.providers_dir.join(format!("{}.toml", provider_id));

        if !provider_file.exists() {
            anyhow::bail!("Provider '{}' is not installed", provider_id);
        }

        fs::remove_file(&provider_file)?;

        println!(
            "{} Provider '{}' uninstalled successfully",
            "✅".green(),
            provider_id
        );

        // Check if there are any API keys to clean up
        let keys = crate::keys::KeysConfig::load()?;
        if keys.has_auth(provider_id) {
            println!(
                "{} Note: API keys for '{}' are still stored in keys.toml",
                "ℹ️".blue(),
                provider_id
            );
            println!("  To remove them, use: lc keys remove {}", provider_id);
        }

        Ok(())
    }

    /// Validate a provider configuration
    fn validate_provider_config(&self, config_content: &str) -> Result<()> {
        // Try to parse as TOML
        let config: toml::Value = toml::from_str(config_content)
            .map_err(|e| anyhow::anyhow!("Invalid TOML format: {}", e))?;

        // Check required fields
        let required_fields = ["endpoint", "models_path", "chat_path"];

        for field in &required_fields {
            if !config.get(field).is_some() {
                anyhow::bail!("Provider config missing required field: {}", field);
            }
        }

        Ok(())
    }

    /// Show authentication instructions for a provider
    fn show_auth_instructions(&self, provider_id: &str, metadata: &ProviderMetadata) -> Result<()> {
        println!("\n{} Authentication Setup", "🔑".yellow());

        match metadata.auth_type {
            AuthType::ApiKey => {
                println!("This provider requires an API key.");
                println!("To set it up, run:");
                println!("  {}", format!("lc keys add {}", provider_id).bold());
            }
            AuthType::ServiceAccount => {
                println!("This provider requires a service account JSON.");
                println!("To set it up, run:");
                println!("  {}", format!("lc keys add {}", provider_id).bold());
            }
            AuthType::OAuth => {
                println!("This provider uses OAuth authentication.");
                println!("Follow the provider's documentation to set up OAuth.");
                if let Some(docs_url) = &metadata.docs_url {
                    println!("Documentation: {}", docs_url.blue());
                }
            }
            AuthType::Token => {
                println!("This provider requires an authentication token.");
                println!("To set it up, run:");
                println!("  {}", format!("lc keys add {}", provider_id).bold());
            }
            AuthType::Headers => {
                println!("This provider requires custom authentication headers.");
                println!("To set them up, run:");
                println!(
                    "  {}",
                    format!(
                        "lc providers headers {} add <header-name> <header-value>",
                        provider_id
                    )
                    .bold()
                );
            }
            AuthType::None => {
                println!("This provider does not require authentication.");
            }
        }

        Ok(())
    }
}

/// Create a sample provider registry for testing
#[allow(dead_code)]
pub fn create_sample_registry() -> ProviderRegistry {
    let mut providers = HashMap::new();

    // Add sample providers
    providers.insert(
        "openai".to_string(),
        ProviderMetadata {
            name: "OpenAI".to_string(),
            description: "OpenAI GPT models including GPT-4 and GPT-3.5".to_string(),
            config_file: "openai.toml".to_string(),
            version: "1.0.0".to_string(),
            auth_type: AuthType::ApiKey,
            tags: vec![
                "official".to_string(),
                "chat".to_string(),
                "embeddings".to_string(),
            ],
            official: true,
            docs_url: Some("https://platform.openai.com/docs".to_string()),
            min_version: None,
        },
    );

    providers.insert(
        "gemini".to_string(),
        ProviderMetadata {
            name: "Google Gemini".to_string(),
            description: "Google's Gemini models".to_string(),
            config_file: "gemini.toml".to_string(),
            version: "1.0.0".to_string(),
            auth_type: AuthType::ApiKey,
            tags: vec![
                "official".to_string(),
                "chat".to_string(),
                "vision".to_string(),
            ],
            official: true,
            docs_url: Some("https://ai.google.dev/docs".to_string()),
            min_version: None,
        },
    );

    providers.insert(
        "anthropic".to_string(),
        ProviderMetadata {
            name: "Anthropic Claude".to_string(),
            description: "Anthropic's Claude models".to_string(),
            config_file: "anthropic.toml".to_string(),
            version: "1.0.0".to_string(),
            auth_type: AuthType::ApiKey,
            tags: vec!["official".to_string(), "chat".to_string()],
            official: true,
            docs_url: Some("https://docs.anthropic.com".to_string()),
            min_version: None,
        },
    );

    ProviderRegistry {
        version: "1.0.0".to_string(),
        providers,
        base_url: "https://raw.githubusercontent.com/rajashekar/lc-providers/main".to_string(),
    }
}

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

    #[test]
    fn test_provider_metadata_serialization() {
        let metadata = ProviderMetadata {
            name: "Test Provider".to_string(),
            description: "A test provider".to_string(),
            config_file: "test.toml".to_string(),
            version: "1.0.0".to_string(),
            auth_type: AuthType::ApiKey,
            tags: vec!["test".to_string()],
            official: false,
            docs_url: None,
            min_version: None,
        };

        let json = serde_json::to_string(&metadata).unwrap();
        let deserialized: ProviderMetadata = serde_json::from_str(&json).unwrap();

        assert_eq!(metadata.name, deserialized.name);
        assert_eq!(metadata.version, deserialized.version);
    }

    #[test]
    fn test_registry_creation() {
        let registry = create_sample_registry();

        assert!(registry.providers.contains_key("openai"));
        assert!(registry.providers.contains_key("gemini"));
        assert!(registry.providers.contains_key("anthropic"));

        let openai = &registry.providers["openai"];
        assert_eq!(openai.name, "OpenAI");
        assert!(openai.official);
    }
}