package dsl

import (
	"strings"
	"testing"
)

func TestTokenStringAndUnknownType(t *testing.T) {
	tok := Token{Type: TOKEN_IDENT, Value: "foo", Line: 2, Col: 5}
	s := tok.String()
	if !strings.Contains(s, "IDENT") || !strings.Contains(s, "foo") {
		t.Errorf("Token.String() = %q", s)
	}
	if got := TokenType(999).String(); got != "UNKNOWN" {
		t.Errorf("TokenType(999).String() = %q, want UNKNOWN", got)
	}
	for tt, want := range map[TokenType]string{
		TOKEN_STRING:   "STRING",
		TOKEN_FLOAT:    "FLOAT",
		TOKEN_INT:      "INT",
		TOKEN_DURATION: "DURATION",
		TOKEN_SIZE:     "SIZE",
		TOKEN_LBRACE:   "{",
		TOKEN_RBRACE:   "}",
		TOKEN_LPAREN:   "(",
		TOKEN_RPAREN:   ")",
		TOKEN_ASSIGN:   "=",
		TOKEN_TILDE:    "~",
		TOKEN_EOF:      "EOF",
	} {
		if got := tt.String(); got != want {
			t.Errorf("TokenType(%d) = %q, want %q", tt, got, want)
		}
	}
}

func TestLexerLineComment(t *testing.T) {
	src := `
// leading comment
build "make" // trailing
group("g") { // inside
    weight = 1.0
    test("t") { stdout = "" }
}
`
	if _, _, err := Parse(src); err != nil {
		t.Errorf("parse with comments: %v", err)
	}
}

func TestLexerUnterminatedString(t *testing.T) {
	_, _, err := Parse(`build "unterminated`)
	if err == nil || !strings.Contains(err.Error(), "unterminated") {
		t.Errorf("want unterminated string error, got %v", err)
	}
}

func TestLexerUnknownEscape(t *testing.T) {
	_, _, err := Parse(`build "bad\zescape"`)
	if err == nil || !strings.Contains(err.Error(), "unknown escape") {
		t.Errorf("want unknown escape error, got %v", err)
	}
}

func TestLexerEscapeSequences(t *testing.T) {
	src := `build "a\nb\tc\\d\"e"`
	f, _, err := Parse(src + "\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdout = \"\" } }")
	if err != nil {
		t.Fatalf("parse: %v", err)
	}
	if f.Build != "a\nb\tc\\d\"e" {
		t.Errorf("escape sequences = %q", f.Build)
	}
}

func TestLexerUnexpectedCharacter(t *testing.T) {
	_, _, err := Parse("build @invalid")
	if err == nil || !strings.Contains(err.Error(), "unexpected character") {
		t.Errorf("want unexpected character error, got %v", err)
	}
}

func TestLexerUnterminatedHeredoc(t *testing.T) {
	src := "build \"x\"\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdin = \"\"\"\nnever closed\n } }"
	_, _, err := Parse(src)
	if err == nil || !strings.Contains(err.Error(), "unterminated heredoc") {
		t.Errorf("want unterminated heredoc, got %v", err)
	}
}

func TestLexerSizeSuffixes(t *testing.T) {
	cases := map[string]int64{
		"1024":    1024,
		"1B":      1,
		"1K":      1024,
		"1KB":     1024,
		"1KiB":    1024,
		"1M":      1024 * 1024,
		"1MB":     1024 * 1024,
		"1MiB":    1024 * 1024,
		"1G":      1024 * 1024 * 1024,
		"1GB":     1024 * 1024 * 1024,
		"1GiB":    1024 * 1024 * 1024,
	}
	for literal, want := range cases {
		src := "build \"x\"\nmemory_limit = " + literal + "\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdout = \"\" } }"
		f, _, err := Parse(src)
		if err != nil {
			t.Errorf("parse %q: %v", literal, err)
			continue
		}
		if f.MemoryLimit != want {
			t.Errorf("memory_limit %s = %d, want %d", literal, f.MemoryLimit, want)
		}
	}
}

func TestLexerDurationSuffixes(t *testing.T) {
	cases := []string{"5ms", "10s", "2m"}
	for _, d := range cases {
		src := "build \"x\"\ntimeout " + d + "\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdout = \"\" } }"
		if _, _, err := Parse(src); err != nil {
			t.Errorf("parse timeout %s: %v", d, err)
		}
	}
}

func TestLexerNegativeInt(t *testing.T) {
	src := `
build "x"
group("g") {
    weight = 1.0
    test("t") {
        exitCode = -1
        stdout = ""
    }
}
`
	f, _, err := Parse(src)
	if err != nil {
		t.Fatalf("parse: %v", err)
	}
	tst := f.Groups[0].Tests[0]
	if tst.ExitCode == nil || *tst.ExitCode != -1 {
		t.Errorf("ExitCode = %v, want -1", tst.ExitCode)
	}
}

func TestLexerFloatNumber(t *testing.T) {
	src := `
build "x"
group("g") {
    weight = 0.75
    test("t") { stdout = "" }
}
group("g2") {
    weight = 0.25
    test("t") { stdout = "" }
}
`
	f, _, err := Parse(src)
	if err != nil {
		t.Fatalf("parse: %v", err)
	}
	if f.Groups[0].Weight != 0.75 {
		t.Errorf("weight = %v", f.Groups[0].Weight)
	}
}

func TestLexerInvalidSizeUnit(t *testing.T) {
	_, _, err := Parse("build \"x\"\nmemory_limit = 10Z\n")
	if err == nil {
		t.Error("expected error for invalid size unit")
	}
}