package dsl

import (
	"strings"
	"testing"
)

func TestParsePatternDirsMode(t *testing.T) {
	src := `
build "make"
group("g") {
    weight = 1.0
    pattern {
        dirs   = "tests/*"
        input  = "in.txt"
        output = "out.txt"
        args   = "--case" "{name}"
    }
}
`
	f, _, err := Parse(src)
	if err != nil {
		t.Fatalf("parse: %v", err)
	}
	pat := f.Groups[0].Pattern
	if pat == nil {
		t.Fatal("no pattern")
	}
	if pat.DirsGlob != "tests/*" {
		t.Errorf("DirsGlob = %q", pat.DirsGlob)
	}
	if pat.InputFile != "in.txt" || pat.OutputFile != "out.txt" {
		t.Errorf("InputFile/OutputFile = %q/%q", pat.InputFile, pat.OutputFile)
	}
	if len(pat.Args) != 2 || pat.Args[0] != "--case" || pat.Args[1] != "{name}" {
		t.Errorf("Args = %v", pat.Args)
	}
}

func TestParsePatternUnknownField(t *testing.T) {
	src := `
build "make"
group("g") {
    weight = 1.0
    pattern { bogus = "x" }
}
`
	_, _, err := Parse(src)
	if err == nil || !strings.Contains(err.Error(), "unknown pattern field") {
		t.Errorf("want unknown pattern field error, got %v", err)
	}
}

func TestParsePatternNonIdent(t *testing.T) {
	src := `
build "make"
group("g") {
    weight = 1.0
    pattern { "x" = "y" }
}
`
	_, _, err := Parse(src)
	if err == nil {
		t.Error("expected error on non-ident in pattern")
	}
}

func TestParseNormalizeCRLFAndTrimWS(t *testing.T) {
	src := `
build "make"
normalize_crlf = true
trim_trailing_ws = false
group("g") { weight = 1.0 test("t") { stdout = "" } }
`
	f, _, err := Parse(src)
	if err != nil {
		t.Fatalf("parse: %v", err)
	}
	if !f.NormalizeCRLF {
		t.Error("NormalizeCRLF should be true")
	}
	if f.TrimTrailingWS {
		t.Error("TrimTrailingWS should be false")
	}
}

func TestParseBinaryAndSources(t *testing.T) {
	src := `
build "make"
binary = "sol"
sources = "main.c"
group("g") { weight = 1.0 test("t") { stdout = "" } }
`
	f, _, err := Parse(src)
	if err != nil {
		t.Fatalf("parse: %v", err)
	}
	if f.Binary != "sol" {
		t.Errorf("Binary = %q", f.Binary)
	}
	if f.Sources != "main.c" {
		t.Errorf("Sources = %q", f.Sources)
	}
}

func TestParseMemoryLimitBareInt(t *testing.T) {
	src := `
build "make"
memory_limit = 1024
group("g") { weight = 1.0 test("t") { stdout = "" } }
`
	f, _, err := Parse(src)
	if err != nil {
		t.Fatalf("parse: %v", err)
	}
	if f.MemoryLimit != 1024 {
		t.Errorf("MemoryLimit = %d, want 1024", f.MemoryLimit)
	}
}

func TestParseBoolInvalidIdent(t *testing.T) {
	_, _, err := Parse("build \"make\"\nnormalize_crlf = maybe\n")
	if err == nil || !strings.Contains(err.Error(), "true/false") {
		t.Errorf("want true/false error, got %v", err)
	}
}

func TestParseBoolNonIdent(t *testing.T) {
	_, _, err := Parse("build \"make\"\nnormalize_crlf = \"true\"\n")
	if err == nil || !strings.Contains(err.Error(), "true/false") {
		t.Errorf("want true/false error, got %v", err)
	}
}

func TestParseTopLevelNonIdent(t *testing.T) {
	_, _, err := Parse(`"stray"`)
	if err == nil || !strings.Contains(err.Error(), "unexpected token") {
		t.Errorf("want unexpected token error, got %v", err)
	}
}

func TestParseMatcherOrAssignNoMatcher(t *testing.T) {
	src := `
build "make"
group("g") {
    weight = 1.0
    test("t") { stdout 42 }
}
`
	_, _, err := Parse(src)
	if err == nil || !strings.Contains(err.Error(), "expected matcher") {
		t.Errorf("want matcher error, got %v", err)
	}
}

func TestParseStringListEmpty(t *testing.T) {
	src := `
build "make"
group("g") {
    weight = 1.0
    test("t") { args = stdout = "" }
}
`
	_, _, err := Parse(src)
	if err == nil {
		t.Error("expected error on empty string list")
	}
}

func TestParseFileMissing(t *testing.T) {
	_, _, err := ParseFile("/nonexistent/judge-test-does-not-exist.jdg")
	if err == nil {
		t.Error("expected error on missing file")
	}
}

func TestValidateBuildsMixedLegacyAndStructured(t *testing.T) {
	src := `
build "legacy shell"
build_defaults {
    language = "c"
    standard = "c11"
    sources  = "*.c"
    output   = "sol"
    warnings = strict
}
group("g") { weight = 1.0 test("t") { stdout = "" } }
`
	_, _, err := Parse(src)
	if err == nil || !strings.Contains(err.Error(), "cannot mix legacy") {
		t.Errorf("want mix-legacy error, got %v", err)
	}
}