//! Osiris Client - Unified CQRS Client
//!
//! This client provides both:
//! - Commands (writes) via Rhai scripts to Hero Supervisor
//! - Queries (reads) via REST API to Osiris server
//!
//! Follows CQRS pattern with a single unified interface.

use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use thiserror::Error;

pub mod kyc;
pub mod payment;
pub mod communication;

pub use kyc::*;
pub use payment::*;
pub use communication::*;

#[derive(Debug, Error)]
pub enum OsirisClientError {
    #[error("HTTP request failed: {0}")]
    RequestFailed(#[from] reqwest::Error),
    
    #[error("Resource not found: {0}")]
    NotFound(String),
    
    #[error("Deserialization failed: {0}")]
    DeserializationFailed(String),
    
    #[error("Configuration error: {0}")]
    ConfigError(String),
    
    #[error("Command execution failed: {0}")]
    CommandFailed(String),
}

/// Osiris client with CQRS support
#[derive(Clone)]
pub struct OsirisClient {
    // Query side (Osiris REST API)
    osiris_url: String,
    
    // Command side (Supervisor + Rhai)
    supervisor_client: Option<hero_supervisor_openrpc_client::SupervisorClient>,
    runner_name: String,
    timeout: u64,
    
    // HTTP client
    client: reqwest::Client,
}

/// Builder for OsirisClient
#[derive(Clone, Debug, Default)]
pub struct OsirisClientBuilder {
    osiris_url: Option<String>,
    supervisor_url: Option<String>,
    runner_name: Option<String>,
    supervisor_secret: Option<String>,
    timeout: u64,
}

impl OsirisClientBuilder {
    /// Create a new builder
    pub fn new() -> Self {
        Self {
            osiris_url: None,
            supervisor_url: None,
            runner_name: None,
            supervisor_secret: None,
            timeout: 30,
        }
    }

    /// Set the Osiris server URL (for queries)
    pub fn osiris_url(mut self, url: impl Into<String>) -> Self {
        self.osiris_url = Some(url.into());
        self
    }

    /// Set the Supervisor URL (for commands)
    pub fn supervisor_url(mut self, url: impl Into<String>) -> Self {
        self.supervisor_url = Some(url.into());
        self
    }

    /// Set the runner name (default: "osiris")
    pub fn runner_name(mut self, name: impl Into<String>) -> Self {
        self.runner_name = Some(name.into());
        self
    }

    /// Set the supervisor authentication secret
    pub fn supervisor_secret(mut self, secret: impl Into<String>) -> Self {
        self.supervisor_secret = Some(secret.into());
        self
    }

    /// Set the timeout in seconds (default: 30)
    pub fn timeout(mut self, timeout: u64) -> Self {
        self.timeout = timeout;
        self
    }

    /// Build the OsirisClient
    pub fn build(self) -> Result<OsirisClient, OsirisClientError> {
        let osiris_url = self.osiris_url
            .ok_or_else(|| OsirisClientError::ConfigError("osiris_url is required".to_string()))?;

        // Build supervisor client if URL and secret are provided
        let supervisor_client = if let (Some(url), Some(secret)) = (self.supervisor_url, self.supervisor_secret) {
            Some(
                hero_supervisor_openrpc_client::SupervisorClient::builder()
                    .url(url)
                    .secret(secret)
                    .build()
                    .map_err(|e| OsirisClientError::ConfigError(format!("Failed to create supervisor client: {:?}", e)))?
            )
        } else {
            None
        };

        Ok(OsirisClient {
            osiris_url,
            supervisor_client,
            runner_name: self.runner_name.unwrap_or_else(|| "osiris".to_string()),
            timeout: self.timeout,
            client: reqwest::Client::new(),
        })
    }
}

impl OsirisClient {
    /// Create a new Osiris client (query-only)
    pub fn new(osiris_url: impl Into<String>) -> Self {
        Self {
            osiris_url: osiris_url.into(),
            supervisor_client: None,
            runner_name: "osiris".to_string(),
            timeout: 30,
            client: reqwest::Client::new(),
        }
    }

    /// Create a builder for full CQRS configuration
    pub fn builder() -> OsirisClientBuilder {
        OsirisClientBuilder::new()
    }

    /// Generic GET request for any struct by ID
    pub async fn get<T>(&self, struct_name: &str, id: &str) -> Result<T, OsirisClientError>
    where
        T: for<'de> Deserialize<'de>,
    {
        let url = format!("{}/api/{}/{}", self.osiris_url, struct_name, id);
        
        let response = self.client
            .get(&url)
            .send()
            .await?;

        if response.status() == 404 {
            return Err(OsirisClientError::NotFound(format!("{}/{}", struct_name, id)));
        }

        let data = response
            .json::<T>()
            .await
            .map_err(|e| OsirisClientError::DeserializationFailed(e.to_string()))?;

        Ok(data)
    }

    /// Generic LIST request for all instances of a struct
    pub async fn list<T>(&self, struct_name: &str) -> Result<Vec<T>, OsirisClientError>
    where
        T: for<'de> Deserialize<'de>,
    {
        let url = format!("{}/api/{}", self.osiris_url, struct_name);
        
        let response = self.client
            .get(&url)
            .send()
            .await?;

        let data = response
            .json::<Vec<T>>()
            .await
            .map_err(|e| OsirisClientError::DeserializationFailed(e.to_string()))?;

        Ok(data)
    }

    /// Generic QUERY request with filters
    pub async fn query<T>(&self, struct_name: &str, query: &str) -> Result<Vec<T>, OsirisClientError>
    where
        T: for<'de> Deserialize<'de>,
    {
        let url = format!("{}/api/{}?{}", self.osiris_url, struct_name, query);
        
        let response = self.client
            .get(&url)
            .send()
            .await?;

        let data = response
            .json::<Vec<T>>()
            .await
            .map_err(|e| OsirisClientError::DeserializationFailed(e.to_string()))?;

        Ok(data)
    }

    // ========== Command Methods (Supervisor + Rhai) ==========
    // Commands are write operations that execute Rhai scripts via the supervisor
    // to modify state in Osiris

    /// Execute a Rhai script via the Supervisor
    pub async fn execute_script(&self, script: &str) -> Result<RunJobResponse, OsirisClientError> {
        let supervisor_client = self.supervisor_client.as_ref()
            .ok_or_else(|| OsirisClientError::ConfigError("supervisor_client not configured for commands".to_string()))?;

        // Use JobBuilder from supervisor client (which re-exports from hero-job)
        use hero_supervisor_openrpc_client::JobBuilder;
        
        let job = JobBuilder::new()
            .caller_id("osiris-client")
            .context_id("command-execution")
            .runner(&self.runner_name)
            .payload(script)
            .timeout(self.timeout)
            .build()
            .map_err(|e| OsirisClientError::CommandFailed(format!("Failed to build job: {}", e)))?;
        
        // Use job_run method which returns JobRunResponse
        // Secret is sent via Authorization header (configured during client creation)
        let result = supervisor_client.job_run(job, Some(self.timeout))
            .await
            .map_err(|e| OsirisClientError::CommandFailed(format!("{:?}", e)))?;
        
        // Convert JobRunResponse to our RunJobResponse
        Ok(RunJobResponse {
            job_id: result.job_id,
            status: result.status,
        })
    }

    /// Execute a Rhai script template with variable substitution
    pub async fn execute_template(&self, template: &str, variables: &HashMap<String, String>) -> Result<RunJobResponse, OsirisClientError> {
        let script = substitute_variables(template, variables);
        self.execute_script(&script).await
    }

    // ========== Supervisor-specific CQRS Methods ==========
    
    /// Create an API key (Command - via Rhai)
    pub async fn create_api_key(&self, key: String, name: String, scope: String) -> Result<RunJobResponse, OsirisClientError> {
        let script = format!(
            r#"
            let api_key = new_api_key("{}", "{}", "{}", "{}");
            save_api_key(api_key);
            "#,
            self.get_namespace(),
            key,
            name,
            scope
        );
        self.execute_script(&script).await
    }

    /// Get an API key by key value (Query - via REST)
    pub async fn get_api_key(&self, key: &str) -> Result<Option<serde_json::Value>, OsirisClientError> {
        // Query by indexed field
        let results: Vec<serde_json::Value> = self.query("ApiKey", &format!("key={}", key)).await?;
        Ok(results.into_iter().next())
    }

    /// List all API keys (Query - via REST)
    pub async fn list_api_keys(&self) -> Result<Vec<serde_json::Value>, OsirisClientError> {
        self.list("ApiKey").await
    }

    /// Delete an API key (Command - via Rhai)
    pub async fn delete_api_key(&self, key: String) -> Result<RunJobResponse, OsirisClientError> {
        let script = format!(
            r#"
            delete_api_key("{}");
            "#,
            key
        );
        self.execute_script(&script).await
    }

    /// Create a runner (Command - via Rhai)
    pub async fn create_runner(&self, runner_id: String, name: String, queue: String, registered_by: String) -> Result<RunJobResponse, OsirisClientError> {
        let script = format!(
            r#"
            let runner = new_runner("{}", "{}", "{}", "{}", "{}");
            save_runner(runner);
            "#,
            self.get_namespace(),
            runner_id,
            name,
            queue,
            registered_by
        );
        self.execute_script(&script).await
    }

    /// Get a runner by ID (Query - via REST)
    pub async fn get_runner(&self, runner_id: &str) -> Result<Option<serde_json::Value>, OsirisClientError> {
        let results: Vec<serde_json::Value> = self.query("Runner", &format!("runner_id={}", runner_id)).await?;
        Ok(results.into_iter().next())
    }

    /// List all runners (Query - via REST)
    pub async fn list_runners(&self) -> Result<Vec<serde_json::Value>, OsirisClientError> {
        self.list("Runner").await
    }

    /// Delete a runner (Command - via Rhai)
    pub async fn delete_runner(&self, runner_id: String) -> Result<RunJobResponse, OsirisClientError> {
        let script = format!(
            r#"
            delete_runner("{}");
            "#,
            runner_id
        );
        self.execute_script(&script).await
    }

    /// Create job metadata (Command - via Rhai)
    pub async fn create_job_metadata(&self, job_id: String, runner: String, created_by: String, payload: String) -> Result<RunJobResponse, OsirisClientError> {
        let script = format!(
            r#"
            let job = new_job_metadata("{}", "{}", "{}", "{}", "{}");
            save_job_metadata(job);
            "#,
            self.get_namespace(),
            job_id,
            runner,
            created_by,
            payload
        );
        self.execute_script(&script).await
    }

    /// Get job metadata by ID (Query - via REST)
    pub async fn get_job_metadata(&self, job_id: &str) -> Result<Option<serde_json::Value>, OsirisClientError> {
        let results: Vec<serde_json::Value> = self.query("JobMetadata", &format!("job_id={}", job_id)).await?;
        Ok(results.into_iter().next())
    }

    /// List all job metadata (Query - via REST)
    pub async fn list_job_metadata(&self) -> Result<Vec<serde_json::Value>, OsirisClientError> {
        self.list("JobMetadata").await
    }

    /// List jobs by runner (Query - via REST)
    pub async fn list_jobs_by_runner(&self, runner: &str) -> Result<Vec<serde_json::Value>, OsirisClientError> {
        self.query("JobMetadata", &format!("runner={}", runner)).await
    }

    /// List jobs by creator (Query - via REST)
    pub async fn list_jobs_by_creator(&self, creator: &str) -> Result<Vec<serde_json::Value>, OsirisClientError> {
        self.query("JobMetadata", &format!("created_by={}", creator)).await
    }

    // Helper method to get namespace
    fn get_namespace(&self) -> &str {
        "supervisor"
    }
}

// ========== Helper Structures ==========

#[derive(Serialize)]
struct RunJobRequest {
    runner_name: String,
    script: String,
    timeout: Option<u64>,
    #[serde(skip_serializing_if = "Option::is_none")]
    env: Option<HashMap<String, String>>,
}

#[derive(Deserialize, Debug, Clone)]
pub struct RunJobResponse {
    pub job_id: String,
    pub status: String,
}

/// Helper function to substitute variables in a Rhai script template
pub fn substitute_variables(template: &str, variables: &HashMap<String, String>) -> String {
    let mut result = template.to_string();
    for (key, value) in variables {
        let placeholder = format!("{{{{ {} }}}}", key);
        result = result.replace(&placeholder, value);
    }
    result
}

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

    #[test]
    fn test_client_creation() {
        let client = OsirisClient::new("http://localhost:8080");
        assert_eq!(client.osiris_url, "http://localhost:8080");
    }

    #[test]
    fn test_builder() {
        let client = OsirisClient::builder()
            .osiris_url("http://localhost:8081")
            .supervisor_url("http://localhost:3030")
            .supervisor_secret("test_secret")
            .runner_name("osiris")
            .build()
            .unwrap();
        
        assert_eq!(client.osiris_url, "http://localhost:8081");
        assert_eq!(client.supervisor_url, Some("http://localhost:3030".to_string()));
        assert_eq!(client.runner_name, "osiris");
    }

    #[test]
    fn test_substitute_variables() {
        let template = "let x = {{ value }}; let y = {{ name }};";
        let mut vars = HashMap::new();
        vars.insert("value".to_string(), "42".to_string());
        vars.insert("name".to_string(), "\"test\"".to_string());
        
        let result = substitute_variables(template, &vars);
        assert_eq!(result, "let x = 42; let y = \"test\";");
    }
}