package main

import (
	"context"
	"math/big"
	"time"

	"github.com/openrelayxyz/plugeth-utils/core"
	"github.com/openrelayxyz/plugeth-utils/restricted/hexutil"
)

type LiveTracerResult struct {
	CallStack []CallStack
	Results   []CallStack
}

type CallStack struct {
	Type    string         `json:"type"`
	From    core.Address   `json:"from"`
	To      core.Address   `json:"to"`
	Value   *big.Int       `json:"value,omitempty"`
	Gas     hexutil.Uint64 `json:"gas"`
	GasUsed hexutil.Uint64 `json:"gasUsed"`
	Input   hexutil.Bytes  `json:"input"`
	Output  hexutil.Bytes  `json:"output"`
	Time    string         `json:"time,omitempty"`
	Calls   []CallStack    `json:"calls,omitempty"`
	Results []CallStack    `json:"results,omitempty"`
	Error   string         `json:"error,omitempty"`
}

func (t *LiveTracerResult) TraceBlock(ctx context.Context) (<-chan []CallStack, error) {
	subch := make(chan []CallStack, 1000)
	rtrnch := make(chan []CallStack, 1000)
	go func() {
		log.Info("Subscription Block Tracer setup")
		sub := events.Subscribe(subch)
		for {
			select {
			case <-ctx.Done():
				sub.Unsubscribe()
				close(subch)
				close(rtrnch)
				return
			case t := <-subch:
				rtrnch <- t
			case <-sub.Err():
				sub.Unsubscribe()
				close(subch)
				close(rtrnch)
				return
			}
		}
	}()
	return rtrnch, nil
}

func GetLiveTracer(core.Hash, core.StateDB) core.BlockTracer {
	return &LiveTracerResult{}
}

func (r *LiveTracerResult) PreProcessBlock(hash core.Hash, number uint64, encoded []byte) {
	m := map[string]struct{}{
		"LivePreProcessBlock":struct{}{},
	}
	hookChan <- m
	r.Results = []CallStack{}
}

func (r *LiveTracerResult) PreProcessTransaction(tx core.Hash, block core.Hash, i int) {
	m := map[string]struct{}{
		"LivePreProcessTransaction":struct{}{},
	}
	hookChan <- m
}

func (r *LiveTracerResult) BlockProcessingError(tx core.Hash, block core.Hash, err error) {
	m := map[string]struct{}{
		"LiveBlockProcessingError":struct{}{},
	}
	hookChan <- m
}

func (r *LiveTracerResult) PostProcessTransaction(tx core.Hash, block core.Hash, i int, receipt []byte) {
	m := map[string]struct{}{
		"LivePostProcessTransaction":struct{}{},
	}
	hookChan <- m
}

func (r *LiveTracerResult) PostProcessBlock(block core.Hash) {
	m := map[string]struct{}{
		"LivePostProcessBlock":struct{}{},
	}
	hookChan <- m
	if len(r.Results) > 0 {
		events.Send(r.Results)
	}
}

func (r *LiveTracerResult) CaptureStart(from core.Address, to core.Address, create bool, input []byte, gas uint64, value *big.Int) {
	r.CallStack = []CallStack{}
	m := map[string]struct{}{
		"LiveCaptureStart":struct{}{},
	}
	hookChan <- m
}
func (r *LiveTracerResult) CaptureState(pc uint64, op core.OpCode, gas, cost uint64, scope core.ScopeContext, rData []byte, depth int, err error) {
	m := map[string]struct{}{
		"LiveCaptureState":struct{}{},
	}
	hookChan <- m
}

func (r *LiveTracerResult) CaptureFault(pc uint64, op core.OpCode, gas, cost uint64, scope core.ScopeContext, depth int, err error) {
	// this method is not covered by tests at this time
	// m := map[string]struct{}{
	// 	"LiveCaptureFault":struct{}{},
	// }
	// hookChan <- m
}

func (r *LiveTracerResult) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {
	m := map[string]struct{}{
		"LiveCaptureEnd":struct{}{},
	}
	hookChan <- m
	if len(r.CallStack) > 0 {
		r.Results = append(r.CallStack)
	}
}

func (r *LiveTracerResult) CaptureEnter(typ core.OpCode, from core.Address, to core.Address, input []byte, gas uint64, value *big.Int) {
	// this method is not covered by tests at this time
	// m := map[string]struct{}{
	// 	"LiveCaptureEnter":struct{}{},
	// }
	// hookChan <- m
}

func (r *LiveTracerResult) CaptureExit(output []byte, gasUsed uint64, err error) {
	// this method is not covered by tests at this time
	// m := map[string]struct{}{
	// 	"LiveCaptureExit":struct{}{},
	// }
	// hookChan <- m
}

func (r *LiveTracerResult) Result() (interface{}, error) {
	// this method is not covered by tests at this time
	// m := map[string]struct{}{
	// 	"LiveTracerResult":struct{}{},
	// }
	// hookChan <- m
	return "", nil
}