package tests

import (
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"
	"os"
	"path/filepath"

	// "github.com/ethereum/go-ethereum/logger/glog"
)

var (
	baseDir            = filepath.Join(".", "files")
	blockTestDir       = filepath.Join(baseDir, "BlockTests")
	stateTestDir       = filepath.Join(baseDir, "StateTests")
	transactionTestDir = filepath.Join(baseDir, "TransactionTests")
	vmTestDir          = filepath.Join(baseDir, "VMTests")

	BlockSkipTests = []string{"SimpleTx3"}
	TransSkipTests = []string{"TransactionWithHihghNonce256"}
	StateSkipTests = []string{"mload32bitBound_return", "mload32bitBound_return2"}
	VmSkipTests    = []string{}
)

// type TestRunner interface {
// 	// LoadTest()
// 	RunTest() error
// }

// func RunTests(bt map[string]TestRunner, skipTests []string) error {
// 	// map skipped tests to boolean set
// 	skipTest := make(map[string]bool, len(skipTests))
// 	for _, name := range skipTests {
// 		skipTest[name] = true
// 	}

// 	for name, test := range bt {
// 		// if the test should be skipped, return
// 		if skipTest[name] {
// 			glog.Infoln("Skipping block test", name)
// 			return nil
// 		}
// 		// test the block
// 		if err := test.RunTest(); err != nil {
// 			return err
// 		}
// 		glog.Infoln("Block test passed: ", name)
// 	}
// 	return nil
// }

func readJson(reader io.Reader, value interface{}) error {
	data, err := ioutil.ReadAll(reader)
	if err != nil {
		return fmt.Errorf("Error reading JSON file", err.Error())
	}

	if err = json.Unmarshal(data, &value); err != nil {
		if syntaxerr, ok := err.(*json.SyntaxError); ok {
			line := findLine(data, syntaxerr.Offset)
			return fmt.Errorf("JSON syntax error at line %v: %v", line, err)
		}
		return fmt.Errorf("JSON unmarshal error: %v", err)
	}
	return nil
}

func readJsonHttp(uri string, value interface{}) error {
	resp, err := http.Get(uri)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	err = readJson(resp.Body, value)
	if err != nil {
		return err
	}
	return nil
}

func readJsonFile(fn string, value interface{}) error {
	file, err := os.Open(fn)
	if err != nil {
		return err
	}
	defer file.Close()

	err = readJson(file, value)
	if err != nil {
		return fmt.Errorf("%s in file %s", err.Error(), fn)
	}
	return nil
}

// findLine returns the line number for the given offset into data.
func findLine(data []byte, offset int64) (line int) {
	line = 1
	for i, r := range string(data) {
		if int64(i) >= offset {
			return
		}
		if r == '\n' {
			line++
		}
	}
	return
}