//! Agent CRUD commands: create, list, get, delete, update, export, import

use std::path::PathBuf;
use serde::{Deserialize, Serialize};
use tauri::State;
use zclaw_types::{AgentConfig, AgentId, AgentInfo};

use super::{validate_agent_id, KernelState};
use crate::intelligence::validation::validate_string_length;
use crate::intelligence::identity::{IdentityFile, IdentityManagerState};

// ---------------------------------------------------------------------------
// Request / Response types
// ---------------------------------------------------------------------------

fn default_provider() -> String { "openai".to_string() }
fn default_model() -> String { "gpt-4o-mini".to_string() }
fn default_max_tokens() -> u32 { 4096 }
fn default_temperature() -> f32 { 0.7 }

/// Agent creation request
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CreateAgentRequest {
    pub name: String,
    #[serde(default)]
    pub description: Option<String>,
    #[serde(default)]
    pub system_prompt: Option<String>,
    #[serde(default)]
    pub soul: Option<String>,
    #[serde(default = "default_provider")]
    pub provider: String,
    #[serde(default = "default_model")]
    pub model: String,
    #[serde(default = "default_max_tokens")]
    pub max_tokens: u32,
    #[serde(default = "default_temperature")]
    pub temperature: f32,
    #[serde(default)]
    pub workspace: Option<PathBuf>,
}

/// Agent creation response
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CreateAgentResponse {
    pub id: String,
    pub name: String,
    pub state: String,
}

/// Agent update request
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct AgentUpdateRequest {
    pub name: Option<String>,
    pub description: Option<String>,
    pub system_prompt: Option<String>,
    pub model: Option<String>,
    pub provider: Option<String>,
    pub max_tokens: Option<u32>,
    pub temperature: Option<f32>,
}

// ---------------------------------------------------------------------------
// Commands
// ---------------------------------------------------------------------------

/// Create a new agent
// @reserved: agent CRUD management
// @connected
#[tauri::command]
pub async fn agent_create(
    state: State<'_, KernelState>,
    identity_state: State<'_, IdentityManagerState>,
    request: CreateAgentRequest,
) -> Result<CreateAgentResponse, String> {
    // Input validation
    let name_trimmed = request.name.trim();
    if name_trimmed.is_empty() {
        return Err("Agent name cannot be empty".to_string());
    }
    if request.temperature < 0.0 || request.temperature > 2.0 {
        return Err(format!("Temperature must be between 0 and 2, got {}", request.temperature));
    }
    if request.max_tokens == 0 {
        return Err("max_tokens must be greater than 0".to_string());
    }

    let kernel_lock = state.lock().await;

    let kernel = kernel_lock.as_ref()
        .ok_or_else(|| "Kernel not initialized. Call kernel_init first.".to_string())?;

    // Capture identity-relevant fields before moving request
    let soul_content = request.soul.clone();
    let system_prompt_content = request.system_prompt.clone();

    let mut config = AgentConfig::new(&request.name)
        .with_description(request.description.unwrap_or_default())
        .with_system_prompt(request.system_prompt.unwrap_or_default())
        .with_model(zclaw_types::ModelConfig {
            provider: request.provider,
            model: request.model,
            api_key_env: None,
            base_url: None,
        })
        .with_max_tokens(request.max_tokens)
        .with_temperature(request.temperature);

    if let Some(soul) = request.soul {
        config = config.with_soul(soul);
    }

    if let Some(workspace) = request.workspace {
        config.workspace = Some(workspace);
    }

    let id = kernel.spawn_agent(config)
        .await
        .map_err(|e| format!("Failed to create agent: {}", e))?;

    let agent_id_str = id.to_string();

    // Auto-populate identity files from creation parameters.
    // This ensures the identity system has content for `build_system_prompt()`.
    {
        let mut identity_mgr = identity_state.lock().await;
        if let Some(soul) = soul_content {
            if !soul.is_empty() {
                if let Err(e) = identity_mgr.update_file(&agent_id_str, "soul", &soul) {
                    tracing::warn!("[agent_create] Failed to write soul to identity: {}", e);
                }
            }
        }
        if let Some(prompt) = system_prompt_content {
            if !prompt.is_empty() {
                if let Err(e) = identity_mgr.update_file(&agent_id_str, "instructions", &prompt) {
                    tracing::warn!("[agent_create] Failed to write instructions to identity: {}", e);
                }
            }
        }
    }

    Ok(CreateAgentResponse {
        id: agent_id_str,
        name: request.name,
        state: "running".to_string(),
    })
}

/// List all agents
// @reserved: agent CRUD management
// @connected
#[tauri::command]
pub async fn agent_list(
    state: State<'_, KernelState>,
) -> Result<Vec<AgentInfo>, String> {
    let kernel_lock = state.lock().await;

    let kernel = kernel_lock.as_ref()
        .ok_or_else(|| "Kernel not initialized. Call kernel_init first.".to_string())?;

    Ok(kernel.list_agents())
}

/// Get agent info (with optional UserProfile from memory store)
// @reserved: agent CRUD management
// @connected
#[tauri::command]
pub async fn agent_get(
    state: State<'_, KernelState>,
    agent_id: String,
) -> Result<Option<AgentInfo>, String> {
    let agent_id = validate_agent_id(&agent_id)?;

    let kernel_lock = state.lock().await;

    let kernel = kernel_lock.as_ref()
        .ok_or_else(|| "Kernel not initialized. Call kernel_init first.".to_string())?;

    let id: AgentId = agent_id.parse()
        .map_err(|_| "Invalid agent ID format".to_string())?;

    let mut info = kernel.get_agent(&id);

    // Extend with UserProfile if available (reads from same MemoryStore pool as middleware writes to)
    if let Some(ref mut agent_info) = info {
        let memory_store = kernel.memory();
        let profile_store = zclaw_memory::UserProfileStore::new(memory_store.pool());
        match profile_store.get(&agent_id).await {
            Ok(Some(profile)) => {
                match serde_json::to_value(&profile) {
                    Ok(val) => agent_info.user_profile = Some(val),
                    Err(e) => tracing::warn!("[agent_get] Failed to serialize UserProfile: {}", e),
                }
            }
            Ok(None) => {
                tracing::debug!("[agent_get] No UserProfile found for agent {}", agent_id);
            }
            Err(e) => {
                tracing::warn!("[agent_get] Failed to read UserProfile: {}", e);
            }
        }
    }

    Ok(info)
}

/// Delete an agent
// @connected
#[tauri::command]
pub async fn agent_delete(
    state: State<'_, KernelState>,
    agent_id: String,
) -> Result<(), String> {
    let agent_id = validate_agent_id(&agent_id)?;

    let kernel_lock = state.lock().await;

    let kernel = kernel_lock.as_ref()
        .ok_or_else(|| "Kernel not initialized. Call kernel_init first.".to_string())?;

    let id: AgentId = agent_id.parse()
        .map_err(|_| "Invalid agent ID format".to_string())?;

    kernel.kill_agent(&id)
        .await
        .map_err(|e| format!("Failed to delete agent: {}", e))
}

/// Update an agent's configuration
// @connected
#[tauri::command]
pub async fn agent_update(
    state: State<'_, KernelState>,
    identity_state: State<'_, IdentityManagerState>,
    agent_id: String,
    updates: AgentUpdateRequest,
) -> Result<AgentInfo, String> {
    let agent_id = validate_agent_id(&agent_id)?;

    let kernel_lock = state.lock().await;
    let kernel = kernel_lock.as_ref()
        .ok_or_else(|| "Kernel not initialized. Call kernel_init first.".to_string())?;

    let id: AgentId = agent_id.parse()
        .map_err(|_| "Invalid agent ID format".to_string())?;

    // Get existing config
    let mut config = kernel.get_agent_config(&id)
        .ok_or_else(|| format!("Agent not found: {}", agent_id))?;

    // Apply updates
    if let Some(name) = updates.name {
        // Sync name to identity soul so next session's system prompt includes it
        let mut identity_mgr = identity_state.lock().await;
        let current_soul = identity_mgr.get_file(&agent_id, IdentityFile::Soul);
        let updated_soul = if current_soul.is_empty() {
            format!("# ZCLAW 人格\n\n你的名字是{}。\n\n你是一个成长性的中文 AI 助手。", name)
        } else if current_soul.contains("你的名字是") {
            let re = regex::Regex::new(r"你的名字是[^\n]+").unwrap();
            re.replace(&current_soul, format!("你的名字是{}", name)).to_string()
        } else {
            format!("你的名字是{}。\n\n{}", name, current_soul)
        };
        let _ = identity_mgr.update_file(&agent_id, "soul", &updated_soul);
        drop(identity_mgr);

        config.name = name;
    }
    if let Some(description) = updates.description {
        config.description = Some(description);
    }
    if let Some(system_prompt) = updates.system_prompt {
        config.system_prompt = Some(system_prompt);
    }
    if let Some(model) = updates.model {
        config.model.model = model;
    }
    if let Some(provider) = updates.provider {
        config.model.provider = provider;
    }
    if let Some(max_tokens) = updates.max_tokens {
        config.max_tokens = Some(max_tokens);
    }
    if let Some(temperature) = updates.temperature {
        config.temperature = Some(temperature);
    }

    // Save updated config
    kernel.update_agent(config)
        .await
        .map_err(|e| format!("Failed to update agent: {}", e))?;

    // Return updated info
    kernel.get_agent(&id)
        .ok_or_else(|| format!("Agent not found after update: {}", agent_id))
}

/// @reserved — no frontend UI yet
/// Export an agent configuration as JSON
#[tauri::command]
pub async fn agent_export(
    state: State<'_, KernelState>,
    agent_id: String,
) -> Result<String, String> {
    let agent_id = validate_agent_id(&agent_id)?;

    let kernel_lock = state.lock().await;
    let kernel = kernel_lock.as_ref()
        .ok_or_else(|| "Kernel not initialized. Call kernel_init first.".to_string())?;

    let id: AgentId = agent_id.parse()
        .map_err(|_| "Invalid agent ID format".to_string())?;

    let config = kernel.get_agent_config(&id)
        .ok_or_else(|| format!("Agent not found: {}", agent_id))?;

    serde_json::to_string_pretty(&config)
        .map_err(|e| format!("Failed to serialize agent config: {}", e))
}

/// @reserved — no frontend UI yet
/// Import an agent from JSON configuration
#[tauri::command]
pub async fn agent_import(
    state: State<'_, KernelState>,
    config_json: String,
) -> Result<AgentInfo, String> {
    validate_string_length(&config_json, "config_json", 1_000_000)
        .map_err(|e| format!("{}", e))?;

    let mut config: AgentConfig = serde_json::from_str(&config_json)
        .map_err(|e| format!("Invalid agent config JSON: {}", e))?;

    // Validate system_prompt length to prevent excessive token consumption
    const MAX_SYSTEM_PROMPT_LEN: usize = 50_000;
    if let Some(ref prompt) = config.system_prompt {
        if prompt.len() > MAX_SYSTEM_PROMPT_LEN {
            return Err(format!(
                "system_prompt too long: {} chars (max {})",
                prompt.len(),
                MAX_SYSTEM_PROMPT_LEN
            ));
        }
    }

    // Regenerate ID to avoid collisions
    config.id = AgentId::new();

    let kernel_lock = state.lock().await;
    let kernel = kernel_lock.as_ref()
        .ok_or_else(|| "Kernel not initialized. Call kernel_init first.".to_string())?;

    let new_id = kernel.spawn_agent(config).await
        .map_err(|e| format!("Failed to import agent: {}", e))?;

    kernel.get_agent(&new_id)
        .ok_or_else(|| "Agent was created but could not be retrieved".to_string())
}