use std::collections::HashMap;
use serde::{Deserialize, Serialize};
use super::script::{ScriptPrimitive, WorkflowScript};

static FINDINGS: std::sync::Mutex<Vec<String>> = std::sync::Mutex::new(Vec::new());

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum AgentState {
    Idle,
    Running,
    Completed,
    Failed,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AgentStatus {
    pub state: AgentState,
    pub started_at: Option<i64>,
    pub completed_at: Option<i64>,
    pub error: Option<String>,
}

impl AgentStatus {
    pub fn new() -> Self {
        AgentStatus {
            state: AgentState::Idle,
            started_at: None,
            completed_at: None,
            error: None,
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkflowAgent {
    pub id: String,
    pub name: String,
    pub status: AgentStatus,
}

impl WorkflowAgent {
    pub fn new(id: String, name: String) -> Self {
        WorkflowAgent {
            id,
            name,
            status: AgentStatus::new(),
        }
    }
}

#[derive(Debug, Clone)]
pub struct WorkflowEngine {
    pub agents: Vec<WorkflowAgent>,
    pub concurrency_cap: usize,
    pub findings: Vec<String>,
}

impl WorkflowEngine {
    pub fn new() -> Self {
        WorkflowEngine {
            agents: Vec::new(),
            concurrency_cap: 5,
            findings: Vec::new(),
        }
    }

    pub fn with_concurrency_cap(mut self, cap: usize) -> Self {
        self.concurrency_cap = cap;
        self
    }

    pub fn add_agent(&mut self, agent: WorkflowAgent) {
        self.agents.push(agent);
    }
}

pub fn execute_primitive(primitive: &ScriptPrimitive, args: &HashMap<String, String>) -> anyhow::Result<()> {
    match primitive {
        ScriptPrimitive::Agent(name) => {
            let _agent_name = name;
            let _args = args;
            Ok(())
        }
        ScriptPrimitive::Parallel(scripts) => {
            for script in scripts {
                execute_primitive(script, args)?;
            }
            Ok(())
        }
        ScriptPrimitive::Pipeline(scripts) => {
            for script in scripts {
                execute_primitive(script, args)?;
            }
            Ok(())
        }
        ScriptPrimitive::Phase { name: _name, script } => {
            execute_primitive(script, args)
        }
    }
}

pub fn run_workflow(script: &WorkflowScript, args: &HashMap<String, String>) -> anyhow::Result<String> {
    let concurrency_cap = if script.options.max_concurrency > 0 {
        script.options.max_concurrency.min(5)
    } else {
        5
    };
    let _cap = concurrency_cap;
    execute_primitive(&script.script, args)?;
    Ok("workflow completed".to_string())
}

#[expect(dead_code)]
pub fn push_finding(engine: &mut WorkflowEngine, text: &str) {
    engine.findings.push(text.to_string());
}

pub fn note_finding(text: &str) {
    if let Ok(mut findings) = FINDINGS.lock() {
        findings.push(text.to_string());
    }
}

#[expect(dead_code)]
pub fn current_findings() -> Vec<String> {
    if let Ok(findings) = FINDINGS.lock() {
        findings.clone()
    } else {
        Vec::new()
    }
}

#[expect(dead_code)]
pub fn clear_findings() {
    if let Ok(mut findings) = FINDINGS.lock() {
        findings.clear();
    }
}