package atlas_test

import (
	"testing"

	"git.d-ma.be/mathias/cad-atlas/internal/atlas"
)

func stagedAtlas() *atlas.Atlas {
	return &atlas.Atlas{Stages: []atlas.Stage{
		{No: "STAGE 03", Generate: atlas.GenerateKeys{"gitea-issues"}, Nodes: []atlas.Node{{Title: "authored issue node"}}},
		{No: "STAGE 05", Generate: atlas.GenerateKeys{"gitea-repos"}, Nodes: []atlas.Node{{Title: "authored repo node"}}},
		{No: "STAGE 08", Nodes: []atlas.Node{{Title: "untouched"}}},
	}}
}

func TestPrependGenerated_LiveNodesComeFirstAndAuthoredSurvive(t *testing.T) {
	a := stagedAtlas()

	atlas.PrependGenerated(a, "gitea-repos", []atlas.Node{{Title: "live repo"}})

	got := a.Stages[1].Nodes
	if len(got) != 2 {
		t.Fatalf("want 2 nodes, got %d: %+v", len(got), got)
	}
	if got[0].Title != "live repo" || got[1].Title != "authored repo node" {
		t.Fatalf("order wrong: %+v", got)
	}
}

func TestPrependGenerated_OnlyTouchesMatchingStage(t *testing.T) {
	a := stagedAtlas()

	atlas.PrependGenerated(a, "gitea-repos", []atlas.Node{{Title: "live repo"}})

	if len(a.Stages[0].Nodes) != 1 || a.Stages[0].Nodes[0].Title != "authored issue node" {
		t.Fatalf("stage 03 disturbed: %+v", a.Stages[0].Nodes)
	}
	if len(a.Stages[2].Nodes) != 1 || a.Stages[2].Nodes[0].Title != "untouched" {
		t.Fatalf("stage 08 disturbed: %+v", a.Stages[2].Nodes)
	}
}

// The graceful-skip contract: with GITEA_TOKEN unset the overlay yields no
// nodes, and the atlas must still render its authored placeholders unchanged.
func TestPrependGenerated_NoLiveNodesLeavesAuthoredIntact(t *testing.T) {
	a := stagedAtlas()

	atlas.PrependGenerated(a, "gitea-repos", nil)

	if len(a.Stages[1].Nodes) != 1 || a.Stages[1].Nodes[0].Title != "authored repo node" {
		t.Fatalf("authored nodes lost on empty overlay: %+v", a.Stages[1].Nodes)
	}
}

func TestPrependGenerated_UnknownKeyIsANoop(t *testing.T) {
	a := stagedAtlas()

	atlas.PrependGenerated(a, "no-such-key", []atlas.Node{{Title: "live"}})

	for i, s := range a.Stages {
		if len(s.Nodes) != 1 {
			t.Fatalf("stage %d changed: %+v", i, s.Nodes)
		}
	}
}