package keeper

import (
	"bytes"
	"context"
	"encoding/json"
	"io"
	"log"
	"net/http"
	"os/exec"
	"strconv"
	"strings"

	config "github.com/planetmint/planetmint-go/config"
	"github.com/planetmint/planetmint-go/util"
	"github.com/planetmint/planetmint-go/x/machine/types"

	"github.com/btcsuite/btcd/btcutil/hdkeychain"
	"github.com/btcsuite/btcd/chaincfg"

	errorsmod "cosmossdk.io/errors"
	sdk "github.com/cosmos/cosmos-sdk/types"
)

func (k msgServer) isNFTCreationRequest(machine *types.Machine) bool {
	if !machine.GetReissue() && machine.GetAmount() == 1 && machine.GetPrecision() == 8 {
		return true
	}
	return false
}
func (k msgServer) AttestMachine(goCtx context.Context, msg *types.MsgAttestMachine) (*types.MsgAttestMachineResponse, error) {
	ctx := sdk.UnwrapSDKContext(goCtx)

	// the ante handler verifies that the MachineID exists. Additional result checks got moved to the ante-handler
	// and removed from here due to inconsistency or checking the same thing over and over again.
	ta, _, _ := k.GetTrustAnchor(ctx, msg.Machine.MachineId)

	isValidMachineId, err := util.ValidateSignature(msg.Machine.MachineId, msg.Machine.MachineIdSignature, msg.Machine.MachineId)
	if !isValidMachineId {
		return nil, err
	}

	isValidIssuerPlanetmint := validateExtendedPublicKey(msg.Machine.IssuerPlanetmint, config.PlmntNetParams)
	if !isValidIssuerPlanetmint {
		return nil, errorsmod.Wrap(types.ErrInvalidKey, "planetmint")
	}
	isValidIssuerLiquid := validateExtendedPublicKey(msg.Machine.IssuerLiquid, config.LiquidNetParams)
	if !isValidIssuerLiquid {
		return nil, errorsmod.Wrap(types.ErrInvalidKey, "liquid")
	}

	if k.isNFTCreationRequest(msg.Machine) && util.IsValidatorBlockProposer(ctx, ctx.BlockHeader().ProposerAddress) {
		err := k.issueMachineNFT(msg.Machine)
		if err != nil {
			return nil, types.ErrNFTIssuanceFailed
		}
	}

	if msg.Machine.GetType() == 0 { // 0 == RDDL_MACHINE_UNDEFINED
		return nil, types.ErrMachineTypeUndefined
	}

	k.StoreMachine(ctx, *msg.Machine)
	k.StoreMachineIndex(ctx, *msg.Machine)
	err = k.StoreTrustAnchor(ctx, ta, true)
	if err != nil {
		return nil, err
	}
	return &types.MsgAttestMachineResponse{}, err
}

func validateExtendedPublicKey(issuer string, cfg chaincfg.Params) bool {
	xpubKey, err := hdkeychain.NewKeyFromString(issuer)
	if err != nil {
		return false
	}
	isValidExtendedPublicKey := xpubKey.IsForNet(&cfg)
	return isValidExtendedPublicKey
}

func (k msgServer) issueNFTAsset(name string, machine_address string) (asset_id string, contract string, err error) {
	conf := config.GetConfig()

	cmdName := "poetry"
	cmdArgs := []string{"run", "python", "issuer_service/issue2liquid.py", name, machine_address}

	// Create a new command
	cmd := exec.Command(cmdName, cmdArgs...)

	// If you want to set the working directory
	cmd.Dir = conf.IssuanceServiceDir

	// Capture the output
	var stdout, stderr bytes.Buffer
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr

	// Execute the command
	err = cmd.Run()
	if err != nil {
		log.Fatalf("cmd.Run() failed with %s\n", err)
		err = errorsmod.Wrap(types.ErrMachineNFTIssuance, stderr.String())
	}
	lines := strings.Split(stdout.String(), "\n")
	if len(lines) == 3 {
		asset_id = lines[0]
		contract = lines[1]
	} else {
		err = errorsmod.Wrap(types.ErrMachineNFTIssuanceNoOutput, stderr.String())
	}
	return asset_id, contract, err
}
func (k msgServer) registerAsset(asset_id string, contract string) error {

	conf := config.GetConfig()

	// Create your request payload
	data := map[string]interface{}{
		"asset_id": asset_id,
		"contract": contract,
	}

	jsonData, err := json.Marshal(data)
	if err != nil {
		return errorsmod.Wrap(types.ErrAssetRegistryReqFailure, "Marshall "+err.Error())
	}

	req, err := http.NewRequest("POST", conf.AssetRegistryEndpoint, bytes.NewBuffer(jsonData))
	if err != nil {
		return errorsmod.Wrap(types.ErrAssetRegistryReqFailure, "Request creation: "+err.Error())
	}

	// Set headers
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("accept", "application/json")

	// Send request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		return errorsmod.Wrap(types.ErrAssetRegistryReqSending, err.Error())
	}
	defer resp.Body.Close()

	// Read response
	if resp.StatusCode > 299 {
		return errorsmod.Wrap(types.ErrAssetRegistryRepsonse, "Error reading response body:"+strconv.Itoa(resp.StatusCode))
	}
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return errorsmod.Wrap(types.ErrAssetRegistryRepsonse, "Error reading response body:"+err.Error())
	}
	result_obj := string(body)
	if strings.Contains(result_obj, asset_id) {
		return nil
	} else {
		return errorsmod.Wrap(types.ErrAssetRegistryRepsonse, "does not confirm asset registration")
	}
}

func (k msgServer) issueMachineNFT(machine *types.Machine) error {
	asset_id, contract, err := k.issueNFTAsset(machine.Name, machine.Address)
	if err != nil {
		return err
	}
	return k.registerAsset(asset_id, contract)
}