package api

import (
	"testing"

	"github.com/alexei/tinyforge/internal/store"
)

// TestChildChainNode_MarksPreviewChildren verifies the /chain DTO builder
// distinguishes branch-preview children (materialized by the preview package)
// from operator-created stage children that merely share the parent link.
// The discriminator is preview.IsPreviewChild, which reverses the
// MaterializeForBranch naming formula: name == template.Name + "/" + slug.
func TestChildChainNode_MarksPreviewChildren(t *testing.T) {
	template := store.Workload{
		ID:         "tmpl-1",
		Name:       "myapp",
		SourceKind: "dockerfile",
	}

	tests := []struct {
		name       string
		child      store.Workload
		wantPrev   bool
		wantBranch string
	}{
		{
			name: "preview child is marked with its branch",
			child: store.Workload{
				ID:               "child-prev",
				Name:             "myapp/feat-login",
				SourceKind:       "dockerfile",
				SourceConfig:     `{"branch":"feat/login","port":3000}`,
				ParentWorkloadID: "tmpl-1",
			},
			wantPrev:   true,
			wantBranch: "feat/login",
		},
		{
			name: "operator-named stage child sharing the parent is not a preview",
			child: store.Workload{
				ID:               "child-stage",
				Name:             "myapp-staging",
				SourceKind:       "dockerfile",
				SourceConfig:     `{"branch":"main"}`,
				ParentWorkloadID: "tmpl-1",
			},
			wantPrev:   false,
			wantBranch: "",
		},
		{
			name: "child of a different parent is not a preview of self",
			child: store.Workload{
				ID:               "child-other",
				Name:             "myapp/feat-login",
				SourceKind:       "dockerfile",
				SourceConfig:     `{"branch":"feat/login"}`,
				ParentWorkloadID: "some-other-template",
			},
			wantPrev:   false,
			wantBranch: "",
		},
		{
			name: "child with no branch in source_config is not a preview",
			child: store.Workload{
				ID:               "child-nobranch",
				Name:             "myapp/feat-login",
				SourceKind:       "dockerfile",
				SourceConfig:     `{}`,
				ParentWorkloadID: "tmpl-1",
			},
			wantPrev:   false,
			wantBranch: "",
		},
		{
			// Same parent + a valid branch, but the name carries an extra
			// suffix so it fails ONLY the slug-equality check (expected
			// "myapp/feat-login", got "myapp/feat-login-staging"). The
			// branch alone must not be enough to mark a preview.
			name: "valid branch but name fails the slug match is not a preview",
			child: store.Workload{
				ID:               "child-slugmiss",
				Name:             "myapp/feat-login-staging",
				SourceKind:       "dockerfile",
				SourceConfig:     `{"branch":"feat/login","port":3000}`,
				ParentWorkloadID: "tmpl-1",
			},
			wantPrev:   false,
			wantBranch: "",
		},
		{
			// Uppercase + slash branch: slugifyBranch lowercases and maps
			// "/" -> "-", so "Feature/Login" -> "feature-login" and the name
			// "myapp/feature-login" matches. PreviewBranch must echo the RAW
			// branch from source_config ("Feature/Login"), not the slug.
			name: "uppercase slash branch matches and keeps raw branch",
			child: store.Workload{
				ID:               "child-upper",
				Name:             "myapp/feature-login",
				SourceKind:       "dockerfile",
				SourceConfig:     `{"branch":"Feature/Login","port":8080}`,
				ParentWorkloadID: "tmpl-1",
			},
			wantPrev:   true,
			wantBranch: "Feature/Login",
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			node := childChainNode(template, tc.child)
			if node.IsPreview != tc.wantPrev {
				t.Errorf("IsPreview = %v, want %v", node.IsPreview, tc.wantPrev)
			}
			if node.PreviewBranch != tc.wantBranch {
				t.Errorf("PreviewBranch = %q, want %q", node.PreviewBranch, tc.wantBranch)
			}
			// Base fields must always round-trip regardless of preview status.
			if node.ID != tc.child.ID || node.Name != tc.child.Name {
				t.Errorf("base fields mangled: got id=%q name=%q", node.ID, node.Name)
			}
		})
	}
}

// TestPreviewBranchOf_ToleratesMalformedConfig confirms the branch extractor
// returns "" rather than panicking on a missing or invalid source_config.
func TestPreviewBranchOf_ToleratesMalformedConfig(t *testing.T) {
	cases := []struct {
		name string
		cfg  string
		want string
	}{
		{"valid branch", `{"branch":"release/v1"}`, "release/v1"},
		{"empty config", ``, ""},
		{"empty object", `{}`, ""},
		{"malformed json", `{not-json`, ""},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			got := previewBranchOf(store.Workload{SourceConfig: c.cfg})
			if got != c.want {
				t.Errorf("previewBranchOf(%q) = %q, want %q", c.cfg, got, c.want)
			}
		})
	}
}