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use crate::event::{EventType, Json, Keyframe, TraceEvent};
use crate::point::{Metadata, TracePoint};
use crate::time::now;

static mut TRACER: &'static dyn Trace = &PrintTrace;

pub trait Trace: Sync + Send {
    fn report(&self, event: TracePoint);
    fn metadata(&self) -> Metadata;
    fn now(&self) -> u64;
}

struct PrintTrace;

impl Trace for PrintTrace {
    fn report(&self, point: TracePoint) {
        println!("{:?}", point);
    }

    fn metadata(&self) -> Metadata {
        Metadata {
            address: "".to_string(),
        }
    }

    fn now(&self) -> u64 {
        now()
    }
}

fn tracer() -> &'static dyn Trace {
    unsafe { TRACER }
}

fn set_tracer<F>(make_tracer: F) -> Result<(), SetTraceError>
where
    F: FnOnce() -> &'static dyn Trace,
{
    unsafe {
        TRACER = make_tracer();
        Ok(())
    }
}

#[derive(Debug)]
pub struct SetTraceError;

pub fn set_boxed_tracer(tracer: Box<dyn Trace>) -> Result<(), SetTraceError> {
    set_tracer(|| unsafe { &*Box::into_raw(tracer) })
}

fn report(event: TraceEvent) {
    let t = tracer();
    let metadata = t.metadata();
    t.report(TracePoint {
        timestamp: t.now(),
        event,
        metadata,
    });
}

fn report_keyframe(event_name: String, keyframe: Keyframe) {
    report(TraceEvent {
        event_name,
        event_type: EventType::Keyframe {
            frame_info: keyframe,
        },
        tag: None,
    })
}

pub fn start_block(block_height: u64) {
    report_keyframe("start_block".to_string(), Keyframe::NewBlock { block_height });
}

pub fn start_round(round_id: u64, block_height: u64) {
    report_keyframe(
        "start_round".to_string(),
        Keyframe::NewRound { round_id, block_height },
    )
}

pub fn start_step(step_name: String, round_id: u64, block_height: u64) {
    report_keyframe(
        "start_step".to_string(),
        Keyframe::NewStep {
            step_name,
            round_id,
            block_height,
        },
    )
}

pub fn receive_proposal(
    event_name: String,
    block_height: u64,
    round_id: u64,
    proposer: String,
    hash: String,
    tag: Option<Json>,
) {
    report(TraceEvent {
        event_name,
        event_type: EventType::Propose {
            block_height,
            round_id,
            proposer,
            hash,
        },
        tag,
    });
}

pub fn receive_vote(
    event_name: String,
    block_height: u64,
    round_id: u64,
    voter: String,
    hash: String,
    tag: Option<Json>,
) {
    report(TraceEvent {
        event_name,
        event_type: EventType::Vote {
            block_height,
            round_id,
            voter,
            hash,
        },
        tag,
    })
}

/// report a custom event
pub fn custom(event_name: String, tag: Option<Json>) {
    report(TraceEvent {
        event_name,
        event_type: EventType::Custom,
        tag,
    });
}

/// report an error event
pub fn error(event_name: String, tag: Option<Json>) {
    report(TraceEvent {
        event_name,
        event_type: EventType::Error,
        tag,
    });
}