package external

import (
	"path"
	"strings"
	"testing"
)

func TestLocalPath(t *testing.T) {
	for _, tc := range []struct {
		name, url, want string
		wantErr         bool
	}{
		{
			name: "gitea raw, published document",
			url:  "https://git.hypertheory-labs.dev/loom/bedrock/raw/branch/main/.loom/published/starting.md",
			want: "git.hypertheory-labs.dev/loom/bedrock/starting.md",
		},
		{
			name: "github raw host",
			url:  "https://raw.githubusercontent.com/octocat/Hello-World/main/README.md",
			want: "raw.githubusercontent.com/octocat/Hello-World/README.md",
		},
		{
			name:    "not enough path to name an owner and repository",
			url:     "https://example.com/thing.md",
			wantErr: true,
		},
		{
			name:    "not absolute",
			url:     "/loom/bedrock/starting.md",
			wantErr: true,
		},
	} {
		t.Run(tc.name, func(t *testing.T) {
			got, err := localPath(tc.url)
			if tc.wantErr {
				if err == nil {
					t.Fatalf("localPath(%q) = %q, want an error", tc.url, got)
				}
				return
			}
			if err != nil {
				t.Fatalf("localPath(%q): %v", tc.url, err)
			}
			if got != tc.want {
				t.Errorf("localPath(%q) = %q, want %q", tc.url, got, tc.want)
			}
		})
	}
}

func TestIsFacet(t *testing.T) {
	// A facet is something we wrote beside an adopted document. check must not
	// report our own writing as an unlocked external.
	facets := []string{
		"host/loom/cart/cart.usages.md",
		"host/loom/externals/externals.gaps.md",
		"host/o/r/plan.notes.md",
	}
	documents := []string{
		"host/loom/cart/cart.md",
		"host/loom/bedrock/recording-decisions.md", // a hyphen is not a facet
		"host/o/r/starting.md",
	}
	for _, p := range facets {
		if !isFacet(p) {
			t.Errorf("isFacet(%q) = false, want true", p)
		}
	}
	for _, p := range documents {
		if isFacet(p) {
			t.Errorf("isFacet(%q) = true, want false", p)
		}
	}
}

func TestPublishedNameExtension(t *testing.T) {
	// A published surface is not only markdown, and .md must never be appended
	// to a name that already carries an extension of its own.
	for _, tc := range []struct{ in, want string }{
		{"cart", "cart.md"},
		{"cart.md", "cart.md"},
		{"recovering-data", "recovering-data.md"},
		{"openapi.json", "openapi.json"},
		{"entitlement-examples.json", "entitlement-examples.json"},
	} {
		got := tc.in
		if path.Ext(got) == "" {
			got += ".md"
		}
		if got != tc.want {
			t.Errorf("%q -> %q, want %q", tc.in, got, tc.want)
		}
	}
}

func TestFacetNameKeepsANonMarkdownExtension(t *testing.T) {
	// openapi.json.usages.md, never openapi.usages.md — which would collide with
	// the facet for a sibling openapi.md.
	for _, tc := range []struct{ doc, want string }{
		{"h/o/r/cart.md", "h/o/r/cart.usages.md"},
		{"h/o/r/openapi.json", "h/o/r/openapi.json.usages.md"},
	} {
		if got := strings.TrimSuffix(tc.doc, ".md") + ".usages.md"; got != tc.want {
			t.Errorf("facet for %q = %q, want %q", tc.doc, got, tc.want)
		}
	}
	if !isFacet("h/o/r/openapi.json.usages.md") {
		t.Error("a facet beside a non-markdown document should still read as a facet")
	}
}