/*
    This file is part of go-ethereum

    go-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    go-ethereum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @authors:
 *  Jeffrey Wilcke <i@jev.io>
 *  Taylor Gerring <taylor.gerring@gmail.com>
 */

package main

import (
    "fmt"
    "io/ioutil"
    "os"
    "path/filepath"

    "github.com/codegangsta/cli"
    "github.com/ethereum/go-ethereum/logger/glog"
    "github.com/ethereum/go-ethereum/tests"
)

var (
    continueOnError = false
    testExtension   = ".json"
    defaultTest     = "all"
    defaultDir      = "."
    allTests        = []string{"BlockTests", "StateTests", "TransactionTests", "VMTests"}

    TestFlag = cli.StringFlag{
        Name:  "test",
        Usage: "Test type (string): VMTests, TransactionTests, StateTests, BlockTests",
        Value: defaultTest,
    }
    FileFlag = cli.StringFlag{
        Name:   "file",
        Usage:  "Test file or directory. Directories are searched for .json files 1 level deep",
        Value:  defaultDir,
        EnvVar: "ETHEREUM_TEST_PATH",
    }
    ContinueOnErrorFlag = cli.BoolFlag{
        Name:  "continue",
        Usage: "Continue running tests on error (true) or [default] exit immediately (false)",
    }
)

func runTest(test, file string) error {
    // glog.Infoln("runTest", test, file)
    var err error
    switch test {
    case "bc", "BlockTest", "BlockTests", "BlockChainTest":
        err = tests.RunBlockTest(file)
    case "st", "state", "StateTest", "StateTests":
        err = tests.RunStateTest(file)
    case "tx", "TransactionTest", "TransactionTests":
        err = tests.RunTransactionTests(file)
    case "vm", "VMTest", "VMTests":
        err = tests.RunVmTest(file)
    default:
        err = fmt.Errorf("Invalid test type specified:", test)
    }
    return err
}

func getFiles(path string) ([]string, error) {
    // glog.Infoln("getFiles", path)
    var files []string
    f, err := os.Open(path)
    if err != nil {
        return nil, err
    }
    defer f.Close()

    fi, err := f.Stat()
    if err != nil {
        return nil, err
    }

    switch mode := fi.Mode(); {
    case mode.IsDir():
        fi, _ := ioutil.ReadDir(path)
        files = make([]string, len(fi))
        for i, v := range fi {
            // only go 1 depth and leave directory entires blank
            if !v.IsDir() && v.Name()[len(v.Name())-len(testExtension):len(v.Name())] == testExtension {
                files[i] = filepath.Join(path, v.Name())
                // glog.Infoln("Found file", files[i])
            }
        }
    case mode.IsRegular():
        files = make([]string, 1)
        files[0] = path
    }

    return files, nil
}

func runSuite(test, file string) {
    var tests []string

    if test == defaultTest {
        tests = allTests
    } else {
        tests = []string{test}
    }

    for _, curTest := range tests {
        // glog.Infoln("runSuite", curTest, file)
        var err error
        var files []string
        if test == defaultTest {
            files, err = getFiles(filepath.Join(file, curTest))

        } else {
            files, err = getFiles(file)
        }
        if err != nil {
            glog.Fatalln(err)
        }

        if len(files) == 0 {
            glog.Warningln("No files matched path")
        }
        for _, testfile := range files {
            // Skip blank entries
            if len(testfile) == 0 {
                continue
            }

            // TODO allow io.Reader to be passed so Stdin can be piped
            // RunVmTest(strings.NewReader(os.Args[2]))
            // RunVmTest(os.Stdin)
            err := runTest(curTest, testfile)
            if err != nil {
                if continueOnError {
                    glog.Errorln(err)
                } else {
                    glog.Fatalln(err)
                }
            }

        }
    }
}

func setupApp(c *cli.Context) {
    flagTest := c.GlobalString(TestFlag.Name)
    flagFile := c.GlobalString(FileFlag.Name)
    continueOnError = c.GlobalBool(ContinueOnErrorFlag.Name)

    runSuite(flagTest, flagFile)
}

func main() {
    glog.SetToStderr(true)

    app := cli.NewApp()
    app.Name = "ethtest"
    app.Usage = "go-ethereum test interface"
    app.Action = setupApp
    app.Version = "0.2.0"
    app.Author = "go-ethereum team"

    app.Flags = []cli.Flag{
        TestFlag,
        FileFlag,
        ContinueOnErrorFlag,
    }

    if err := app.Run(os.Args); err != nil {
        glog.Fatalln(err)
    }

}