use crate::executors::{Executor, SkillCall};
use crate::skill_scheduler::SkillScheduler;
use crate::t;
use serde_json::{Value, json};
use std::collections::HashMap;
use std::sync::Arc;
use std::time::Instant;
use super::core::WorkflowExecutor;
use super::prompt;
use super::types::*;
use super::utils::{VARIABLE_REGEX, format_step_results};
pub fn parse_chain_response(response: &str) -> anyhow::Result<ChainPlan> {
let json_str = WorkflowExecutor::extract_json(response);
let value: Value = serde_json::from_str(&json_str)?;
#[derive(serde::Deserialize)]
struct ChainStep {
action: String,
parameters: HashMap<String, Value>,
output_as: Option<String>,
}
#[derive(serde::Deserialize)]
struct ChainResponse {
mode: String,
steps: Vec<ChainStep>,
}
let chain: ChainResponse = serde_json::from_value(value)?;
if chain.mode != "chain" {
anyhow::bail!("Invalid chain mode: expected 'chain', got '{}'", chain.mode);
}
let steps = chain
.steps
.into_iter()
.map(|s| ChainStepDef {
action: s.action,
parameters: s.parameters,
output_as: s.output_as,
})
.collect();
Ok(ChainPlan { steps })
}
fn resolve_variables_deep(value: &Value, context: &HashMap<String, Value>) -> Value {
if let Some(s) = value.as_str() {
if s.contains("{{") && s.contains("}}") {
let mut result = s.to_string();
for cap in VARIABLE_REGEX.captures_iter(s) {
let var_name = &cap[1];
if let Some(val) = context.get(var_name) {
let replacement = if let Some(num) = val.as_f64() {
num.to_string()
} else if let Some(s) = val.as_str() {
s.to_string()
} else {
val.to_string()
};
result = result.replace(&format!("{{{{{}}}}}", var_name), &replacement);
}
}
return Value::String(result);
}
return Value::String(s.to_string());
}
if let Some(s) = value.as_str() {
if s.starts_with("{{") && s.ends_with("}}") {
let var_name = &s[2..s.len() - 2];
if let Some(val) = context.get(var_name) {
return val.clone();
}
return Value::String(s.to_string());
}
return Value::String(s.to_string());
}
if let Some(obj) = value.as_object() {
let mut new_obj = serde_json::Map::new();
for (k, v) in obj {
new_obj.insert(k.clone(), resolve_variables_deep(v, context));
}
return Value::Object(new_obj);
}
if let Some(arr) = value.as_array() {
let new_arr: Vec<Value> = arr
.iter()
.map(|v| resolve_variables_deep(v, context))
.collect();
return Value::Array(new_arr);
}
value.clone()
}
pub async fn execute_chain(
executor: &WorkflowExecutor,
scheduler: &SkillScheduler,
input: &str,
skills_registry: &str,
instances_registry: &str,
) -> String {
let overall_start = Instant::now();
let chain_prompt = prompt::build_chain_prompt(skills_registry, instances_registry, input);
let llm_response = match scheduler.get_llm().generate(&chain_prompt).await {
Ok(resp) => resp,
Err(e) => return format!("{}: {}", t!("error.llm_error"), e),
};
let chain = match parse_chain_response(&llm_response) {
Ok(chain) => chain,
Err(e) => return format!("Failed to parse chain: {}", e),
};
let mut context = HashMap::new();
context.insert("user_input".to_string(), Value::String(input.to_string()));
let mut results = Vec::new();
let task_id = executor.get_task_id().map(|s| s.to_string());
for (idx, step) in chain.steps.iter().enumerate() {
let step_name = step.action.clone();
let step_start = Instant::now();
let mut resolved_params = HashMap::new();
for (key, value) in &step.parameters {
let resolved = resolve_variables_deep(value, &context);
resolved_params.insert(key.clone(), resolved);
}
if let Some(cb) = executor.get_callback() {
if let Some(ref tid) = task_id {
cb.on_step_start(tid, &step_name, idx, Some(&resolved_params))
.await;
}
}
let call = SkillCall {
action: step.action.clone(),
parameters: resolved_params,
};
match executor.get_executor().execute(&call).await {
Ok(output) => {
let duration = step_start.elapsed().as_millis() as u64;
if let Some(cb) = executor.get_callback() {
if let Some(ref tid) = task_id {
cb.on_step_success(tid, &step_name, idx, &output, duration)
.await;
}
}
if let Some(output_as) = &step.output_as {
if let Ok(num) = output.parse::<f64>() {
context.insert(output_as.clone(), json!(num));
} else {
context.insert(output_as.clone(), Value::String(output.clone()));
}
}
results.push(StepResult {
skill: step.action.clone(),
parameters: call.parameters,
output: output.clone(),
status: ExecutionStatus::Success,
});
}
Err(e) => {
let duration = step_start.elapsed().as_millis() as u64;
let error_msg = e.to_string();
if let Some(cb) = executor.get_callback() {
if let Some(ref tid) = task_id {
cb.on_step_failure(tid, &step_name, idx, &error_msg, duration)
.await;
}
}
results.push(StepResult {
skill: step.action.clone(),
parameters: call.parameters,
output: error_msg.clone(),
status: ExecutionStatus::Failure,
});
if let Some(cb) = executor.get_callback() {
if let Some(ref tid) = task_id {
let total_duration = overall_start.elapsed().as_millis() as u64;
cb.on_workflow_failed(tid, &error_msg, total_duration, results.len())
.await;
}
}
return format!("Skill '{}' failed: {}", step.action, error_msg);
}
}
}
let final_output = format_step_results(&results);
let total_duration = overall_start.elapsed().as_millis() as u64;
if let Some(cb) = executor.get_callback() {
if let Some(ref tid) = task_id {
let has_failure = results.iter().any(|r| r.status == ExecutionStatus::Failure);
if has_failure {
cb.on_workflow_failed(tid, &final_output, total_duration, results.len())
.await;
} else {
cb.on_workflow_complete(tid, &final_output, total_duration, results.len())
.await;
}
}
}
final_output
}