package feed

import (
  "encoding/json"
  "fmt"
  "strconv"
  "testing"
)

func TestParseCveIdYear(t *testing.T) {
  if got, err := parseCveIdYear("asdf"); err == nil {
    t.Errorf("got %d, exp error", got)
    return
  }

  goodTests := []struct {
    val string
    exp uint16
  } {
    { "2000", 2000 },
    { "2001", 2001 },
    { "2100", 2100 },
  }

  for _, test := range(goodTests) {
    t.Run(test.val, func(t *testing.T) {
      got, err := parseCveIdYear(test.val)
      if err != nil {
        t.Error(err)
        return
      }

      if got != test.exp {
        t.Errorf("got %d, exp %d", got, test.exp)
        return
      }
    })
  }

  badTests := []struct {
    val string
    exp string
  } {
    { "0000", "year out of bounds: 0000" },
    { "0001", "year out of bounds: 0001" },
    { "1998", "year out of bounds: 1998" },
    { "2128", "year out of bounds: 2128" },
    { "9999", "year out of bounds: 9999" },
  }

  for _, test := range(badTests) {
    t.Run(test.val, func(t *testing.T) {
      if got, err := parseCveIdYear(test.val); err == nil {
        t.Errorf("got %d, exp error", got)
        return
      } else if err.Error() != test.exp {
        t.Errorf("got \"%s\", exp \"%s\"", err.Error(), test.exp)
      }
    })
  }
}

func TestParseCveIdNum(t *testing.T) {
  if got, err := parseCveIdNum("asdf"); err == nil {
    t.Errorf("got %d, exp error", got)
    return
  }

  goodTests := []struct {
    val string
    exp uint32
  } {
    { "0", 0 },
    { "0001", 1 },
    { "2100", 2100 },
    { "999999", 999999 },
    { "33554431", 33554431 },
  }

  for _, test := range(goodTests) {
    t.Run(test.val, func(t *testing.T) {
      got, err := parseCveIdNum(test.val)
      if err != nil {
        t.Error(err)
        return
      }

      if got != test.exp {
        t.Errorf("got %d, exp %d", got, test.exp)
        return
      }
    })
  }

  badTests := []struct {
    val string
    exp string
  } {
    { "33554432", "number out of bounds: 33554432" },
    { "99999999", "number out of bounds: 99999999" },
  }

  for _, test := range(badTests) {
    t.Run(test.val, func(t *testing.T) {
      if got, err := parseCveIdNum(test.val); err == nil {
        t.Errorf("got %d, exp error", got)
      } else if err.Error() != test.exp {
        t.Errorf("got \"%s\", exp \"%s\"", err.Error(), test.exp)
      }
    })
  }
}

func TestNewCveId(t *testing.T) {
  badMatchTests := []string {
    "",
    "\nCVE-2002-1234",
    "CVE-2002-1234\n",
    "CVE20021234\n",
    "asdf",
  }

  for _, test := range(badMatchTests) {
    t.Run(test, func(t *testing.T) {
      exp := fmt.Sprintf("invalid CVE ID: %s", test)
      if got, err := NewCveId(test); err == nil {
        t.Errorf("got %s, exp error", got)
      } else if err.Error() != exp {
        t.Errorf("got \"%s\", exp \"%s\"", err.Error(), exp)
      }
    })
  }

  badYearTests := []struct {
    val string
    exp string
  } {
    { "CVE-0000-1234", "year out of bounds: 0000" },
    { "CVE-1998-1234", "year out of bounds: 1998" },
    { "CVE-2128-1234", "year out of bounds: 2128" },
    { "CVE-9999-1234", "year out of bounds: 9999" },
  }

  for _, test := range(badYearTests) {
    t.Run(test.val, func(t *testing.T) {
      if got, err := NewCveId(test.val); err == nil {
        t.Errorf("got %s, exp error", got)
      } else if err.Error() != test.exp {
        t.Errorf("got \"%s\", exp \"%s\"", err.Error(), test.exp)
      }
    })
  }

  badNumTests := []struct {
    val string
    exp string
  } {
    { "CVE-2000-33554432", "number out of bounds: 33554432" },
    { "CVE-2000-99999999", "number out of bounds: 99999999" },
  }

  for _, test := range(badNumTests) {
    t.Run(test.val, func(t *testing.T) {
      if got, err := NewCveId(test.val); err == nil {
        t.Errorf("got %s, exp error", got)
      } else if err.Error() != test.exp {
        t.Errorf("got \"%s\", exp \"%s\"", err.Error(), test.exp)
      }
    })
  }

  goodTests := []string {
    "CVE-1999-0",
    "CVE-2126-0",
    "CVE-1999-33554431",
    "CVE-2126-33554431",
  }

  for _, val := range(goodTests) {
    t.Run(val, func(t *testing.T) {
      if _, err := NewCveId(val); err != nil {
        t.Error(err)
      }
    })
  }
}
func TestCveIdYear(t *testing.T) {
  for year := 1999; year < 2126; year++ {
    t.Run(strconv.FormatInt(int64(year), 10), func(t *testing.T) {
      // expected value
      exp := uint16(year)

      // build cve id, check for error
      id, err := NewCveId(fmt.Sprintf("CVE-%04d-0000", year))
      if err != nil {
        t.Error(err)
        return
      }

      // check year
      got := id.Year()
      if got != exp {
        t.Errorf("got %d, exp %d", got, exp)
      }
    })
  }
}

func TestCveIdNumber(t *testing.T) {
  for num := 0; num < 99999; num++ {
    t.Run(strconv.FormatInt(int64(num), 10), func(t *testing.T) {
      // expected value
      exp := uint32(num)

      // build cve id, check for error
      id, err := NewCveId(fmt.Sprintf("CVE-2000-%04d", num))
      if err != nil {
        t.Error(err)
        return
      }

      // check number
      got := id.Number()
      if got != exp {
        t.Errorf("got %d, exp %d", got, exp)
      }
    })
  }
}

func TestCveIdUnmarshalInvalidData(t *testing.T) {
  test := []byte(`{}`)
  var val CveId

  if err := json.Unmarshal(test, &val); err == nil {
    t.Errorf("got \"%s\", exp error", val)
  }
}

func TestCveIdUnmarshalUnknown(t *testing.T) {
  test := []byte(`"foo"`)
  exp := "invalid CVE ID: foo"
  var val CveId

  err := json.Unmarshal(test, &val)
  if err == nil {
    t.Errorf("got \"%s\", exp error", val)
    return
  }

  if err.Error() != exp {
    t.Errorf("got \"%s\", exp \"%s\"", err.Error(), exp)
  }
}

func TestCveIdUnmarshalValid(t *testing.T) {
  tests := []struct {
    val string
    expYear uint16
    expNum uint32
    exp string
  } {
    { "\"CVE-1999-0\"", 1999, 0, "CVE-1999-0000" },
    { "\"CVE-1999-1234\"", 1999, 1234, "CVE-1999-1234" },
    { "\"CVE-1999-33554431\"", 1999, 33554431, "CVE-1999-33554431" },
    { "\"CVE-2126-0\"", 2126, 0, "CVE-2126-0000" },
    { "\"CVE-2126-1234\"", 2126, 1234, "CVE-2126-1234" },
    { "\"CVE-2126-33554431\"", 2126, 33554431, "CVE-2126-33554431" },
  }

  for _, test := range(tests) {
    t.Run(test.val, func(t *testing.T) {
      var got CveId
      if err := json.Unmarshal([]byte(test.val), &got); err != nil {
        t.Error(err)
        return
      }

      // check year
      if got.Year() != test.expYear {
        t.Errorf("got \"%d\", exp \"%d\"", got.Year(), test.expYear)
      }

      // check year
      if got.Number() != test.expNum {
        t.Errorf("got \"%d\", exp \"%d\"", got.Number(), test.expNum)
      }

      // check string
      if got.String() != test.exp {
        t.Errorf("got \"%s\", exp \"%s\"", got.String(), test.exp)
      }
    })
  }
}