package core

import (
	"os"
	"path/filepath"
	"runtime"
	"testing"
)

func TestExpandHome(t *testing.T) {
	home, err := os.UserHomeDir()
	if err != nil {
		t.Skipf("cannot get home dir: %v", err)
	}

	tests := []struct {
		input    string
		expected string
	}{
		{"~", home},
		{"~/foo", filepath.Join(home, "foo")},
		{"~/foo/bar", filepath.Join(home, "foo", "bar")},
		{"/absolute/path", "/absolute/path"},
		{"relative/path", "relative/path"},
		{"", ""},
	}

	for _, tt := range tests {
		t.Run(tt.input, func(t *testing.T) {
			got := ExpandHome(tt.input)
			if got != tt.expected {
				t.Errorf("ExpandHome(%q) = %q, want %q", tt.input, got, tt.expected)
			}
		})
	}
}

func TestCompressHome(t *testing.T) {
	home, err := os.UserHomeDir()
	if err != nil {
		t.Skipf("cannot get home dir: %v", err)
	}

	tests := []struct {
		input    string
		expected string
	}{
		{home, "~"},
		{filepath.Join(home, "foo"), "~/foo"},
		{filepath.Join(home, "foo", "bar"), "~/foo/bar"},
		{"/other/path", "/other/path"},
		{"relative/path", "relative/path"},
	}

	for _, tt := range tests {
		t.Run(tt.input, func(t *testing.T) {
			got := CompressHome(tt.input)
			if got != tt.expected {
				t.Errorf("CompressHome(%q) = %q, want %q", tt.input, got, tt.expected)
			}
		})
	}
}

func TestSplitPackageSpec(t *testing.T) {
	tests := []struct {
		input       string
		wantPkg     string
		wantRel     string
		wantErr     bool
	}{
		{"pkg", "pkg", "", false},
		{"pkg:path", "pkg", "path", false},
		{"pkg:path/to/file", "pkg", "path/to/file", false},
		{"pkg:/leading", "pkg", "leading", false},
		{"/leading/pkg", "leading/pkg", "", false},  // leading slash trimmed
		{"", "", "", true},
		{":nope", "", "", true},
	}

	for _, tt := range tests {
		t.Run(tt.input, func(t *testing.T) {
			pkg, rel, err := SplitPackageSpec(tt.input)
			if (err != nil) != tt.wantErr {
				t.Errorf("SplitPackageSpec(%q) error = %v, wantErr %v", tt.input, err, tt.wantErr)
				return
			}
			if pkg != tt.wantPkg || rel != tt.wantRel {
				t.Errorf("SplitPackageSpec(%q) = (%q, %q), want (%q, %q)", tt.input, pkg, rel, tt.wantPkg, tt.wantRel)
			}
		})
	}
}

func TestSelectTarget(t *testing.T) {
	goos := runtime.GOOS
	osKey := goos
	if osKey == "darwin" {
		osKey = "macos"
	}

	tests := []struct {
		name    string
		cfg     *packageConfig
		want    string
		wantErr bool
	}{
		{
			name: "matching os",
			cfg: &packageConfig{
				targets: map[string]string{osKey: "/foo"},
			},
			want:    filepath.Join("/foo"),
			wantErr: false,
		},
		{
			name: "fallback to default",
			cfg: &packageConfig{
				targets: map[string]string{"default": "/bar"},
			},
			want:    filepath.Join("/bar"),
			wantErr: false,
		},
		{
			name: "os overrides default",
			cfg: &packageConfig{
				targets: map[string]string{osKey: "/os", "default": "/default"},
			},
			want:    filepath.Join("/os"),
			wantErr: false,
		},
		{
			name: "disabled target",
			cfg: &packageConfig{
				targets:  map[string]string{},
				disabled: map[string]bool{osKey: true},
			},
			want:    "",
			wantErr: true,
		},
		{
			name: "missing target",
			cfg: &packageConfig{
				targets: map[string]string{"other": "/other"},
			},
			want:    "",
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := SelectTarget(tt.cfg)
			if (err != nil) != tt.wantErr {
				t.Errorf("SelectTarget() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if got != tt.want {
				t.Errorf("SelectTarget() = %q, want %q", got, tt.want)
			}
		})
	}
}