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use chrono::prelude::*;

#[derive(Debug, Serialize)]
pub struct Context {
    id: String,
    key: String,
    #[serde(serialize_with = "datetime_to_millis")]
    pub created_on: DateTime<Utc>,
    pub span_stack: std::cell::RefCell<Vec<crate::Span>>,
}

fn datetime_to_millis<S>(d: &DateTime<Utc>, ser: S) -> Result<S::Ok, S::Error>
where
    S: serde::Serializer,
{
    ser.serialize_i64(d.timestamp_millis())
}

thread_local! {
    static CONTEXT: std::cell::RefCell<Option<Context>> = std::cell::RefCell::new(None);
}

impl Context {
    pub fn new(id: String) -> Context {
        Context {
            id,
            key: uuid::Uuid::new_v4().to_string(),
            created_on: Utc::now(),
            span_stack: std::cell::RefCell::new(vec![crate::Span::new("main")]),
        }
    }

    pub fn id(&self) -> String {
        self.id.to_string()
    }

    pub fn start_span(&self, id: &str) {
        self.span_stack.borrow_mut().push(crate::Span::new(id));
    }

    #[allow(dead_code)]
    pub(crate) fn observe_span_id(&self, id: &str) {
        let frame = self.span_stack.borrow_mut().pop();
        if let Some(mut frame) = frame {
            frame.set_id(id);
            self.span_stack.borrow_mut().push(frame);
        }
    }

    pub(crate) fn observe_span_field(&self, key: &'static str, value: serde_json::Value) {
        let frame = self.span_stack.borrow_mut().pop();
        if let Some(mut frame) = frame {
            frame.add_breadcrumbs(key, value);
            self.span_stack.borrow_mut().push(frame);
        }
    }

    pub(crate) fn observe_span_result(&self, value: impl serde::Serialize) {
        let frame = self.span_stack.borrow_mut().pop();
        if let Some(mut frame) = frame {
            frame.set_result(value);
            self.span_stack.borrow_mut().push(frame);
        }
    }

    pub(crate) fn span_log(&self, value: &'static str) {
        let frame = self.span_stack.borrow_mut().pop();
        if let Some(mut frame) = frame {
            frame.add_log(value);
            self.span_stack.borrow_mut().push(frame);
        }
    }

    pub fn end_span(&self, _is_critical: bool, err: Option<String>) {
        let child = self.span_stack.borrow_mut().pop();
        let parent = self.span_stack.borrow_mut().pop();
        if let Some(mut child_frame) = child {
            child_frame.set_success(err.is_none()).set_err(err).end();
            if let Some(mut parent_frame) = parent {
                parent_frame.add_sub_frame(child_frame.created_on, child_frame);
                self.span_stack.borrow_mut().push(parent_frame);
            } else {
                self.span_stack.borrow_mut().push(child_frame);
            }
        }
    }

    pub(crate) fn end_ctx_frame(&self) {
        let frame = self.span_stack.borrow_mut().pop();
        if let Some(mut frame) = frame {
            frame.end();
            self.span_stack.borrow_mut().push(frame);
        }
    }

    pub fn finalise(&self) {
        self.end_ctx_frame();
    }

    pub fn get_key(&self) -> String {
        self.key.clone()
    }
}