// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package compiler

import (
	"os/exec"
	"strings"
	"testing"
)

const (
	testSource = `
contract test {
   /// @notice Will multiply ` + "`a`" + ` by 7.
   function multiply(uint a) returns(uint d) {
       return a * 7;
   }
}
`
	librarySource = `
library Set {
  struct Data { mapping(uint => bool) flags; }
  function insert(Data storage self, uint value)
      returns (bool)
  {
      if (self.flags[value])
          return false; // already there
      self.flags[value] = true;
      return true;
  }

  function remove(Data storage self, uint value)
      returns (bool)
  {
      if (!self.flags[value])
          return false; // not there
      self.flags[value] = false;
      return true;
  }

  function contains(Data storage self, uint value)
      returns (bool)
  {
      return self.flags[value];
  }
}

contract C {
    Set.Data knownValues;
    function register(uint value) {
        require(Set.insert(knownValues, value));
    }
}`
)

func skipWithoutSolc(t *testing.T) {
	if _, err := exec.LookPath("solc"); err != nil {
		t.Skip(err)
	}
}

func TestCompiler(t *testing.T) {
	skipWithoutSolc(t)

	contracts, err := CompileSolidityString("", testSource)
	if err != nil {
		t.Fatalf("error compiling source. result %v: %v", contracts, err)
	}
	if len(contracts) != 1 {
		t.Errorf("one contract expected, got %d", len(contracts))
	}
	c, ok := contracts["test"]
	if !ok {
		c, ok = contracts["<stdin>:test"]
		if !ok {
			t.Fatal("info for contract 'test' not present in result")
		}
	}
	if c.Code == "" {
		t.Error("empty code")
	}
	if c.Info.Source != testSource {
		t.Error("wrong source")
	}
	if c.Info.CompilerVersion == "" {
		t.Error("empty version")
	}
}

func TestCompileError(t *testing.T) {
	skipWithoutSolc(t)

	contracts, err := CompileSolidityString("", testSource[4:])
	if err == nil {
		t.Errorf("error expected compiling source. got none. result %v", contracts)
	}
	t.Logf("error: %v", err)
}

func TestCompilerLinking(t *testing.T) {
	skipWithoutSolc(t)

	solc, err := SolidityVersion("")
	if err != nil {
		t.Fatalf("%v", err)
	}

	solc.FlagOpts.ToLink = append(solc.FlagOpts.ToLink, "Set:0x692a70d2e424a56d2c6c27aa97d1a86395877b3a")

	linkedLibraries := solc.linkLibraries()

	testingCase1 := "--libraries Set:0x692a70d2e424a56d2c6c27aa97d1a86395877b3a"
	if strings.Compare(linkedLibraries, testingCase1) != 0 {
		t.Errorf("expected %v, got %v", linkedLibraries, testingCase1)
	}
}