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| General Bots Copyright (c) pragmatismo.com.br. All rights reserved.         |
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\*****************************************************************************/

use crate::shared::models::{TriggerKind, UserSession};
use crate::shared::state::AppState;
use diesel::prelude::*;
use log::trace;
use rhai::{Dynamic, Engine};
use serde::{Deserialize, Serialize};
use serde_json::{json, Value};
use std::error::Error;
use uuid::Uuid;

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WebhookRegistration {
    pub id: Uuid,
    pub bot_id: Uuid,
    pub endpoint: String,
    pub script_name: String,
    pub is_active: bool,
    pub created_at: chrono::DateTime<chrono::Utc>,
}

pub fn webhook_keyword(state: &AppState, _user: UserSession, engine: &mut Engine) {
    let _state_clone = state.clone();

    engine
        .register_custom_syntax(["WEBHOOK", "$expr$"], false, move |context, inputs| {
            let endpoint = context.eval_expression_tree(&inputs[0])?.to_string();

            trace!("WEBHOOK registration for endpoint: {}", endpoint);

            Ok(Dynamic::from(format!("webhook:{}", endpoint)))
        })
        .expect("valid syntax registration");
}

pub fn execute_webhook_registration(
    conn: &mut diesel::PgConnection,
    endpoint: &str,
    script_name: &str,
    bot_uuid: Uuid,
) -> Result<Value, Box<dyn Error + Send + Sync>> {
    trace!(
        "Registering WEBHOOK endpoint: {}, script: {}, bot_id: {:?}",
        endpoint,
        script_name,
        bot_uuid
    );

    use crate::shared::models::bots::dsl::bots;
    let bot_exists: bool = diesel::select(diesel::dsl::exists(
        bots.filter(crate::shared::models::bots::dsl::id.eq(bot_uuid)),
    ))
    .get_result(conn)?;

    if !bot_exists {
        return Err(format!("Bot with id {} does not exist", bot_uuid).into());
    }

    let clean_endpoint = endpoint
        .trim()
        .trim_matches('"')
        .trim_matches('\'')
        .to_lowercase()
        .replace(' ', "-")
        .chars()
        .filter(|c| c.is_ascii_alphanumeric() || *c == '-' || *c == '_')
        .collect::<String>();

    use crate::shared::models::system_automations::dsl::*;

    let new_automation = (
        bot_id.eq(bot_uuid),
        kind.eq(TriggerKind::Webhook as i32),
        target.eq(&clean_endpoint),
        param.eq(script_name),
        is_active.eq(true),
    );

    let update_result = diesel::update(system_automations)
        .filter(bot_id.eq(bot_uuid))
        .filter(kind.eq(TriggerKind::Webhook as i32))
        .filter(target.eq(&clean_endpoint))
        .set((param.eq(script_name), is_active.eq(true)))
        .execute(&mut *conn)?;

    let result = if update_result == 0 {
        diesel::insert_into(system_automations)
            .values(&new_automation)
            .execute(&mut *conn)?
    } else {
        update_result
    };

    Ok(json!({
        "command": "webhook",
        "endpoint": clean_endpoint,
        "script": script_name,
        "bot_id": bot_uuid.to_string(),
        "rows_affected": result
    }))
}

pub fn remove_webhook_registration(
    conn: &mut diesel::PgConnection,
    endpoint: &str,
    bot_uuid: Uuid,
) -> Result<usize, Box<dyn Error + Send + Sync>> {
    use crate::shared::models::system_automations::dsl::*;

    let clean_endpoint = endpoint
        .trim()
        .trim_matches('"')
        .trim_matches('\'')
        .to_lowercase()
        .replace(' ', "-");

    let result = diesel::delete(
        system_automations
            .filter(bot_id.eq(bot_uuid))
            .filter(kind.eq(TriggerKind::Webhook as i32))
            .filter(target.eq(&clean_endpoint)),
    )
    .execute(&mut *conn)?;

    Ok(result)
}

pub type WebhookResult = Vec<(String, String, bool)>;

pub fn get_bot_webhooks(
    conn: &mut diesel::PgConnection,
    bot_uuid: Uuid,
) -> Result<WebhookResult, Box<dyn Error + Send + Sync>> {
    #[derive(QueryableByName)]
    struct WebhookRow {
        #[diesel(sql_type = diesel::sql_types::Nullable<diesel::sql_types::Text>)]
        target: Option<String>,
        #[diesel(sql_type = diesel::sql_types::Text)]
        param: String,
        #[diesel(sql_type = diesel::sql_types::Bool)]
        is_active: bool,
    }

    let results: Vec<WebhookRow> = diesel::sql_query(
        "SELECT target, param, is_active FROM system_automations WHERE bot_id = $1 AND kind = $2",
    )
    .bind::<diesel::sql_types::Uuid, _>(bot_uuid)
    .bind::<diesel::sql_types::Int4, _>(TriggerKind::Webhook as i32)
    .load(conn)?;

    Ok(results
        .into_iter()
        .map(|r| (r.target.unwrap_or_default(), r.param, r.is_active))
        .collect())
}

pub fn find_webhook_script(
    conn: &mut diesel::PgConnection,
    bot_uuid: Uuid,
    endpoint: &str,
) -> Result<Option<String>, Box<dyn Error + Send + Sync>> {
    use crate::shared::models::system_automations::dsl::*;

    let clean_endpoint = endpoint
        .trim()
        .trim_matches('"')
        .trim_matches('\'')
        .to_lowercase();

    let result: Option<String> = system_automations
        .filter(bot_id.eq(bot_uuid))
        .filter(kind.eq(TriggerKind::Webhook as i32))
        .filter(target.eq(&clean_endpoint))
        .filter(is_active.eq(true))
        .select(param)
        .first(conn)
        .optional()?;

    Ok(result)
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WebhookRequest {
    pub method: String,
    pub headers: std::collections::HashMap<String, String>,
    pub query_params: std::collections::HashMap<String, String>,
    pub body: Value,
    pub path: String,
    pub timestamp: chrono::DateTime<chrono::Utc>,
}

impl WebhookRequest {
    pub fn new(
        method: &str,
        headers: std::collections::HashMap<String, String>,
        query_params: std::collections::HashMap<String, String>,
        body: Value,
        path: &str,
    ) -> Self {
        Self {
            method: method.to_string(),
            headers,
            query_params,
            body,
            path: path.to_string(),
            timestamp: chrono::Utc::now(),
        }
    }

    pub fn to_dynamic(&self) -> Dynamic {
        let mut map = rhai::Map::new();

        map.insert("method".into(), Dynamic::from(self.method.clone()));
        map.insert("path".into(), Dynamic::from(self.path.clone()));
        map.insert(
            "timestamp".into(),
            Dynamic::from(self.timestamp.to_rfc3339()),
        );

        let mut headers_map = rhai::Map::new();
        for (k, v) in &self.headers {
            headers_map.insert(k.clone().into(), Dynamic::from(v.clone()));
        }
        map.insert("headers".into(), Dynamic::from(headers_map));

        let mut params_map = rhai::Map::new();
        for (k, v) in &self.query_params {
            params_map.insert(k.clone().into(), Dynamic::from(v.clone()));
        }
        map.insert("params".into(), Dynamic::from(params_map));

        map.insert("body".into(), json_to_dynamic(&self.body));

        Dynamic::from(map)
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WebhookResponse {
    pub status: u16,
    pub headers: std::collections::HashMap<String, String>,
    pub body: Value,
}

impl Default for WebhookResponse {
    fn default() -> Self {
        Self {
            status: 200,
            headers: std::collections::HashMap::new(),
            body: json!({"status": "ok"}),
        }
    }
}

impl WebhookResponse {
    pub fn success(data: Value) -> Self {
        Self {
            status: 200,
            headers: std::collections::HashMap::new(),
            body: data,
        }
    }

    pub fn error(status: u16, message: &str) -> Self {
        Self {
            status,
            headers: std::collections::HashMap::new(),
            body: json!({"error": message}),
        }
    }

    pub fn from_dynamic(value: &Dynamic) -> Self {
        if value.is_map() {
            let map = value.clone().try_cast::<rhai::Map>().unwrap_or_default();

            let status = map
                .get("status")
                .and_then(|v| v.as_int().ok())
                .unwrap_or(200) as u16;

            let body = map
                .get("body")
                .map(dynamic_to_json)
                .unwrap_or_else(|| json!({"status": "ok"}));

            let mut headers = std::collections::HashMap::new();
            if let Some(h) = map.get("headers") {
                if let Some(headers_map) = h.clone().try_cast::<rhai::Map>() {
                    for (k, v) in headers_map {
                        headers.insert(k.to_string(), v.to_string());
                    }
                }
            }

            Self {
                status,
                headers,
                body,
            }
        } else {
            Self::success(dynamic_to_json(value))
        }
    }
}

fn json_to_dynamic(value: &Value) -> Dynamic {
    match value {
        Value::Null => Dynamic::UNIT,
        Value::Bool(b) => Dynamic::from(*b),
        Value::Number(n) => {
            if let Some(i) = n.as_i64() {
                Dynamic::from(i)
            } else if let Some(f) = n.as_f64() {
                Dynamic::from(f)
            } else {
                Dynamic::UNIT
            }
        }
        Value::String(s) => Dynamic::from(s.clone()),
        Value::Array(arr) => {
            let rhai_arr: rhai::Array = arr.iter().map(json_to_dynamic).collect();
            Dynamic::from(rhai_arr)
        }
        Value::Object(obj) => {
            let mut map = rhai::Map::new();
            for (k, v) in obj {
                map.insert(k.clone().into(), json_to_dynamic(v));
            }
            Dynamic::from(map)
        }
    }
}

fn dynamic_to_json(value: &Dynamic) -> Value {
    if value.is_unit() {
        Value::Null
    } else if value.is_bool() {
        Value::Bool(value.as_bool().unwrap_or(false))
    } else if value.is_int() {
        Value::Number(value.as_int().unwrap_or(0).into())
    } else if value.is_float() {
        if let Ok(f) = value.as_float() {
            serde_json::Number::from_f64(f)
                .map(Value::Number)
                .unwrap_or(Value::Null)
        } else {
            Value::Null
        }
    } else if value.is_string() {
        Value::String(value.to_string())
    } else if value.is_array() {
        let arr = value.clone().into_array().unwrap_or_default();
        Value::Array(arr.iter().map(dynamic_to_json).collect())
    } else if value.is_map() {
        let map = value.clone().try_cast::<rhai::Map>().unwrap_or_default();
        let obj: serde_json::Map<String, Value> = map
            .iter()
            .map(|(k, v)| (k.to_string(), dynamic_to_json(v)))
            .collect();
        Value::Object(obj)
    } else {
        Value::String(value.to_string())
    }
}

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

    #[test]
    fn test_webhook_request_to_dynamic() {
        let mut headers = std::collections::HashMap::new();
        headers.insert("Content-Type".to_string(), "application/json".to_string());

        let mut params = std::collections::HashMap::new();
        params.insert("id".to_string(), "123".to_string());

        let request = WebhookRequest::new(
            "POST",
            headers,
            params,
            json!({"order": "test"}),
            "/webhook/order-received",
        );

        let dynamic = request.to_dynamic();
        assert!(dynamic.is_map());
    }

    #[test]
    fn test_webhook_response_from_dynamic() {
        let mut map = rhai::Map::new();
        map.insert("status".into(), Dynamic::from(201_i64));
        map.insert(
            "body".into(),
            Dynamic::from(json!({"message": "created"}).to_string()),
        );

        let dynamic = Dynamic::from(map);
        let response = WebhookResponse::from_dynamic(&dynamic);

        assert_eq!(response.status, 201);
    }

    #[test]
    fn test_json_to_dynamic_and_back() {
        let original = json!({
            "name": "test",
            "count": 42,
            "active": true,
            "items": [1, 2, 3]
        });

        let dynamic = json_to_dynamic(&original);
        let back = dynamic_to_json(&dynamic);

        assert_eq!(original["name"], back["name"]);
        assert_eq!(original["count"], back["count"]);
        assert_eq!(original["active"], back["active"]);
    }

    #[test]
    fn test_webhook_response_default() {
        let response = WebhookResponse::default();
        assert_eq!(response.status, 200);
    }

    #[test]
    fn test_webhook_response_error() {
        let response = WebhookResponse::error(404, "Not found");
        assert_eq!(response.status, 404);
        assert_eq!(response.body["error"], "Not found");
    }
}