package dsl

import (
	"strings"
	"testing"
)

func TestParserErrorCases(t *testing.T) {
	const prefix = `build "go build ."` + "\n"
	cases := []struct {
		name string
		body string
		want string
	}{
		{
			name: "group missing lparen",
			body: `group "g" { weight = 1.0 test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group name not string",
			body: `group(foo) { weight = 1.0 test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group missing rparen",
			body: `group("g" { weight = 1.0 test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group missing lbrace",
			body: `group("g") weight = 1.0`,
			want: "expected",
		},
		{
			name: "group non-ident in body",
			body: `group("g") { 42 }`,
			want: "unexpected token",
		},
		{
			name: "group weight missing assign",
			body: `group("g") { weight 1.0 test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group weight non-number",
			body: `group("g") { weight = "bad" test("t") { stdout = "" } }`,
			want: "",
		},
		{
			name: "group timeout missing assign",
			body: `group("g") { weight = 1.0 timeout 5s test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group timeout non-duration",
			body: `group("g") { weight = 1.0 timeout = "5s" test("t") { stdout = "" } }`,
			want: "",
		},
		{
			name: "group memory_limit missing assign",
			body: `group("g") { weight = 1.0 memory_limit 64MB test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group memory_limit non-size",
			body: `group("g") { weight = 1.0 memory_limit = "64MB" test("t") { stdout = "" } }`,
			want: "",
		},
		{
			name: "group scoring missing assign",
			body: `group("g") { weight = 1.0 scoring partial test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group scoring non-ident",
			body: `group("g") { weight = 1.0 scoring = "partial" test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group env missing lparen",
			body: `group("g") { weight = 1.0 env "K" = "v" test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group env key not string",
			body: `group("g") { weight = 1.0 env(K) = "v" test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group env missing rparen",
			body: `group("g") { weight = 1.0 env("K" = "v" test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group env missing assign",
			body: `group("g") { weight = 1.0 env("K") "v" test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group env value not string",
			body: `group("g") { weight = 1.0 env("K") = K test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group wrapper missing assign",
			body: `group("g") { weight = 1.0 wrapper "x" test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group wrapper not string",
			body: `group("g") { weight = 1.0 wrapper = X test("t") { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "group unclosed",
			body: `group("g") { weight = 1.0 test("t") { stdout = "" }`,
			want: "",
		},
		{
			name: "group pattern error",
			body: `group("g") { weight = 1.0 pattern { bogus = 1 } }`,
			want: "",
		},

		{
			name: "test missing lparen",
			body: `group("g") { weight = 1.0 test "t" { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test name not string",
			body: `group("g") { weight = 1.0 test(t) { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test missing rparen",
			body: `group("g") { weight = 1.0 test("t" { stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test missing lbrace",
			body: `group("g") { weight = 1.0 test("t") stdout = "" }`,
			want: "expected",
		},
		{
			name: "test non-ident in body",
			body: `group("g") { weight = 1.0 test("t") { 42 } }`,
			want: "unexpected token",
		},
		{
			name: "test stdin missing assign",
			body: `group("g") { weight = 1.0 test("t") { stdin "x" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test stdin not string",
			body: `group("g") { weight = 1.0 test("t") { stdin = 1 stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test args missing assign",
			body: `group("g") { weight = 1.0 test("t") { args "x" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test exitCode missing assign",
			body: `group("g") { weight = 1.0 test("t") { exitCode 0 stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test exitCode not int",
			body: `group("g") { weight = 1.0 test("t") { exitCode = "x" stdout = "" } }`,
			want: "",
		},
		{
			name: "test timeout missing assign",
			body: `group("g") { weight = 1.0 test("t") { timeout 2s stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test timeout not duration",
			body: `group("g") { weight = 1.0 test("t") { timeout = "2s" stdout = "" } }`,
			want: "",
		},
		{
			name: "test memory_limit missing assign",
			body: `group("g") { weight = 1.0 test("t") { memory_limit 64MB stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test memory_limit not size",
			body: `group("g") { weight = 1.0 test("t") { memory_limit = "64MB" stdout = "" } }`,
			want: "",
		},
		{
			name: "test wrapper missing assign",
			body: `group("g") { weight = 1.0 test("t") { wrapper "x" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test wrapper not string",
			body: `group("g") { weight = 1.0 test("t") { wrapper = X stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test env missing lparen",
			body: `group("g") { weight = 1.0 test("t") { env "K" = "v" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test env key not string",
			body: `group("g") { weight = 1.0 test("t") { env(K) = "v" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test env missing rparen",
			body: `group("g") { weight = 1.0 test("t") { env("K" = "v" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test env missing assign",
			body: `group("g") { weight = 1.0 test("t") { env("K") "v" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test env value not string",
			body: `group("g") { weight = 1.0 test("t") { env("K") = K stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test file missing lparen",
			body: `group("g") { weight = 1.0 test("t") { file "x" = "y" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test file key not string",
			body: `group("g") { weight = 1.0 test("t") { file(x) = "y" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test file missing rparen",
			body: `group("g") { weight = 1.0 test("t") { file("x" = "y" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test file missing assign",
			body: `group("g") { weight = 1.0 test("t") { file("x") "y" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test file value not string",
			body: `group("g") { weight = 1.0 test("t") { file("x") = y stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test outFile missing lparen",
			body: `group("g") { weight = 1.0 test("t") { outFile "x" = "y" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test outFile key not string",
			body: `group("g") { weight = 1.0 test("t") { outFile(x) = "y" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test outFile missing rparen",
			body: `group("g") { weight = 1.0 test("t") { outFile("x" = "y" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test outFile missing assign",
			body: `group("g") { weight = 1.0 test("t") { outFile("x") "y" stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test outFile value not string",
			body: `group("g") { weight = 1.0 test("t") { outFile("x") = y stdout = "" } }`,
			want: "expected",
		},
		{
			name: "test unclosed",
			body: `group("g") { weight = 1.0 test("t") { stdout = ""`,
			want: "",
		},
	}

	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			_, _, err := Parse(prefix + c.body)
			if err == nil {
				t.Fatalf("expected error, got nil")
			}
			if c.want != "" && !strings.Contains(err.Error(), c.want) {
				t.Errorf("error = %q, want substring %q", err.Error(), c.want)
			}
		})
	}
}