//! RPC handlers for multi-identity management.

use super::RpcHandler;
use crate::identity_manager::{IdentityManager, IdentityPurpose};
use anyhow::Result;

impl RpcHandler {
    /// List all identities with their default status.
    pub(super) async fn handle_identity_list(
        &self,
        _params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let manager = IdentityManager::new(&self.config.data_dir).await?;
        let (identities, default_id) = manager.list().await?;

        let items: Vec<serde_json::Value> = identities
            .into_iter()
            .map(|id| {
                let is_default = default_id.as_deref() == Some(&id.id);
                serde_json::json!({
                    "id": id.id,
                    "name": id.name,
                    "purpose": id.purpose,
                    "pubkey": id.pubkey_hex,
                    "did": id.did,
                    "created_at": id.created_at,
                    "is_default": is_default,
                })
            })
            .collect();

        Ok(serde_json::json!({ "identities": items }))
    }

    /// Create a new identity.
    pub(super) async fn handle_identity_create(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.unwrap_or_default();
        let name = params
            .get("name")
            .and_then(|v| v.as_str())
            .unwrap_or("Personal")
            .to_string();

        let purpose_str = params
            .get("purpose")
            .and_then(|v| v.as_str())
            .unwrap_or("personal");

        let purpose = match purpose_str {
            "business" => IdentityPurpose::Business,
            "anonymous" => IdentityPurpose::Anonymous,
            _ => IdentityPurpose::Personal,
        };

        let manager = IdentityManager::new(&self.config.data_dir).await?;
        let record = manager.create(name, purpose).await?;

        Ok(serde_json::json!({
            "id": record.id,
            "name": record.name,
            "purpose": record.purpose,
            "pubkey": record.pubkey_hex,
            "did": record.did,
            "created_at": record.created_at,
        }))
    }

    /// Get a single identity by ID.
    pub(super) async fn handle_identity_get(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.unwrap_or_default();
        let id = params
            .get("id")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: id"))?;

        let manager = IdentityManager::new(&self.config.data_dir).await?;
        let record = manager.get(id).await?;
        let (_, default_id) = manager.list().await?;
        let is_default = default_id.as_deref() == Some(&record.id);

        Ok(serde_json::json!({
            "id": record.id,
            "name": record.name,
            "purpose": record.purpose,
            "pubkey": record.pubkey_hex,
            "did": record.did,
            "created_at": record.created_at,
            "is_default": is_default,
        }))
    }

    /// Delete an identity.
    pub(super) async fn handle_identity_delete(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.unwrap_or_default();
        let id = params
            .get("id")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: id"))?;

        let manager = IdentityManager::new(&self.config.data_dir).await?;
        manager.delete(id).await?;

        Ok(serde_json::json!({ "ok": true }))
    }

    /// Set the default identity.
    pub(super) async fn handle_identity_set_default(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.unwrap_or_default();
        let id = params
            .get("id")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: id"))?;

        let manager = IdentityManager::new(&self.config.data_dir).await?;
        manager.set_default(id).await?;

        Ok(serde_json::json!({ "ok": true }))
    }

    /// Sign a message with a specific identity.
    pub(super) async fn handle_identity_sign(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.unwrap_or_default();
        let id = params
            .get("id")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: id"))?;
        let message = params
            .get("message")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: message"))?;

        let manager = IdentityManager::new(&self.config.data_dir).await?;
        let signature = manager.sign(id, message.as_bytes()).await?;
        let record = manager.get(id).await?;

        Ok(serde_json::json!({
            "did": record.did,
            "message": message,
            "signature": signature,
        }))
    }

    /// Verify a signature against a DID.
    pub(super) async fn handle_identity_verify(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.unwrap_or_default();
        let did = params
            .get("did")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: did"))?;
        let message = params
            .get("message")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: message"))?;
        let signature = params
            .get("signature")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: signature"))?;

        let manager = IdentityManager::new(&self.config.data_dir).await?;
        let valid = manager.verify(did, message.as_bytes(), signature).await?;

        Ok(serde_json::json!({ "valid": valid }))
    }

    /// Create a Nostr keypair linked to an identity.
    pub(super) async fn handle_identity_create_nostr_key(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.unwrap_or_default();
        let id = params
            .get("id")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: id"))?;

        let manager = IdentityManager::new(&self.config.data_dir).await?;
        let pubkey = manager.create_nostr_key(id).await?;

        Ok(serde_json::json!({
            "nostr_pubkey": pubkey,
        }))
    }

    /// Sign a Nostr event hash with an identity's Nostr key.
    pub(super) async fn handle_identity_nostr_sign(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.unwrap_or_default();
        let id = params
            .get("id")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: id"))?;
        let event_hash = params
            .get("event_hash")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: event_hash"))?;

        let manager = IdentityManager::new(&self.config.data_dir).await?;
        let signature = manager.nostr_sign(id, event_hash).await?;

        Ok(serde_json::json!({
            "signature": signature,
        }))
    }
}