package validator

import (
	"testing"
)

func TestValidateExtraArgs_DenyList(t *testing.T) {
	denied := []string{
		"-m", "--model",
		"-mu", "--model-url",
		"-dr", "--docker-repo",
		"-hf", "-hfr", "--hf-repo",
		"-hff", "--hf-file",
		"-hfv", "-hfrv", "--hf-repo-v",
		"-hffv", "--hf-file-v",
		"-hft", "--hf-token",
		"-mm", "--mmproj",
		"-mmu", "--mmproj-url",
		"--host", "--port", "--path", "--api-prefix", "--reuse-port",
		"--api-key", "--api-key-file",
		"--ssl-key-file", "--ssl-cert-file",
		"--webui", "--no-webui", "--ui", "--no-ui",
		"--ui-config", "--ui-config-file",
		"--ui-mcp-proxy", "--no-ui-mcp-proxy",
		"--models-dir", "--models-preset", "--models-max",
		"--models-autoload", "--no-models-autoload",
	}
	for _, flag := range denied {
		t.Run(flag, func(t *testing.T) {
			_, err := ValidateExtraArgs([]string{flag})
			if err == nil {
				t.Fatalf("expected error for %s", flag)
			}
		})
	}
}

func TestValidateExtraArgs_SafeFlags(t *testing.T) {
	safe := []string{
		"-c", "--ctx-size", "-ngl", "--gpu-layers",
		"--top-k", "--cache-type-k", "--jinja", "--no-jinja",
		"--spec-draft-n-max", "-fa", "--flash-attn",
		"-t", "--threads", "-np", "--parallel", "--no-mmap",
	}
	for _, flag := range safe {
		t.Run(flag, func(t *testing.T) {
			out, err := ValidateExtraArgs([]string{flag})
			if err != nil {
				t.Fatalf("unexpected error for %s: %v", flag, err)
			}
			if len(out) != 1 || out[0] != flag {
				t.Fatalf("expected [%s], got %v", flag, out)
			}
		})
	}
}

func TestValidateExtraArgs_FlagEqualsValue(t *testing.T) {
	_, err := ValidateExtraArgs([]string{"--model=evil.gguf"})
	if err == nil {
		t.Fatal("expected error for --model=evil.gguf")
	}
	out, err := ValidateExtraArgs([]string{"--ctx-size=4096"})
	if err != nil {
		t.Fatal(err)
	}
	if len(out) != 1 || out[0] != "--ctx-size=4096" {
		t.Fatalf("expected [--ctx-size=4096], got %v", out)
	}
}

func TestValidateExtraArgs_NegativeNumber(t *testing.T) {
	out, err := ValidateExtraArgs([]string{"--seed", "-1"})
	if err != nil {
		t.Fatal(err)
	}
	if len(out) != 2 {
		t.Fatalf("expected 2 tokens, got %d", len(out))
	}
}

func TestValidateExtraArgs_Empty(t *testing.T) {
	out, err := ValidateExtraArgs(nil)
	if err != nil {
		t.Fatal(err)
	}
	if out != nil {
		t.Fatalf("expected nil, got %v", out)
	}
}

func TestIsManagedFlag(t *testing.T) {
	if !IsManagedFlag("--model") {
		t.Fatal("--model should be managed")
	}
	if !IsManagedFlag("-m") {
		t.Fatal("-m should be managed")
	}
	if IsManagedFlag("-c") {
		t.Fatal("-c should not be managed")
	}
}

func TestFlagName(t *testing.T) {
	tests := []struct {
		in, want string
	}{
		{"--model=foo", "--model"},
		{"-c", "-c"},
		{"--top-k", "--top-k"},
		{"-1", ""},
		{"-0.5", ""},
		{"-", ""},
		{"--", ""},
		{"hello", ""},
	}
	for _, tt := range tests {
		got := FlagName(tt.in)
		if got != tt.want {
			t.Errorf("FlagName(%q) = %q, want %q", tt.in, got, tt.want)
		}
	}
}

func TestStripShadowingFlags(t *testing.T) {
	t.Run("strips context flag with value", func(t *testing.T) {
		out := StripShadowingFlags([]string{"-c", "4096", "--top-k", "40"})
		if len(out) != 2 || out[0] != "--top-k" || out[1] != "40" {
			t.Fatalf("got %v", out)
		}
	})
	t.Run("retains non-shadowing flags", func(t *testing.T) {
		out := StripShadowingFlags([]string{"--top-k", "40", "--top-p", "0.95"})
		if len(out) != 4 {
			t.Fatalf("got %v", out)
		}
	})
	t.Run("strips boolean jinja flag", func(t *testing.T) {
		out := StripShadowingFlags([]string{"--jinja", "--top-k", "40"})
		if len(out) != 2 || out[0] != "--top-k" {
			t.Fatalf("got %v", out)
		}
	})
	t.Run("strips equals form", func(t *testing.T) {
		out := StripShadowingFlags([]string{"--ctx-size=4096"})
		if len(out) != 0 {
			t.Fatalf("got %v", out)
		}
	})
}