package configkit_test

import (
	"testing"

	configkit "go.maximumdirect.net/configkit"
)

func TestMainRelativeOptions(t *testing.T) {
	if configkit.MainRelative() == configkit.MainRelative() {
		t.Fatal("binding descriptions must be distinct")
	}
	invalid := &configkit.FilesystemContext{BaseDir: "relative", Root: "relative"}
	cases := []struct {
		name                     string
		main                     configkit.Input
		underlay                 configkit.Input
		overlay                  string
		overlayContext, fallback *configkit.FilesystemContext
		wantError                bool
	}{
		{name: "binding on main", main: configkit.Input{Source: configkit.NoSource(), MainRelative: configkit.MainRelative()}, wantError: true},
		{name: "binding on file", underlay: configkit.Input{Source: configkit.File("missing"), MainRelative: configkit.MainRelative()}, wantError: true},
		{name: "invalid fallback", underlay: configkit.Input{Source: configkit.NoSource(), MainRelative: &configkit.MainRelativeContext{Fallback: invalid}}, wantError: true},
		{name: "shadowed binding", underlay: configkit.Input{Source: configkit.NoSource(), Filesystem: &configkit.FilesystemContext{Root: t.TempDir()}, MainRelative: &configkit.MainRelativeContext{Fallback: invalid}}},
		{name: "inactive overlay fallback", fallback: invalid},
		{name: "invalid explicit overlay", overlay: "test", overlayContext: invalid, fallback: &configkit.FilesystemContext{Root: t.TempDir(), BaseDir: t.TempDir()}, wantError: true},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			main := tc.main
			if tc.name != "binding on main" {
				main.Source = configkit.NoSource()
			}
			opts := configkit.LayeredOptions[layeredFacadeConfig]{Overlay: tc.overlay, OverlayFilesystem: tc.overlayContext, OverlayFallback: tc.fallback}
			if tc.name == "binding on file" || tc.name == "invalid fallback" || tc.name == "shadowed binding" {
				opts.Underlays = []configkit.Underlay{{Inputs: []configkit.Input{tc.underlay}}}
			}
			_, err := configkit.LoadLayered(main, opts)
			if (err != nil) != tc.wantError {
				t.Fatalf("error = %v, want error %v", err, tc.wantError)
			}
		})
	}
}