package collector

import (
	"encoding/json"
	"os"
	"testing"
)

func TestGetCurrentSystemRevision(t *testing.T) {
	// Skip if not on NixOS with system.configurationRevision set
	if _, err := os.Stat(configRevisionPath); os.IsNotExist(err) {
		t.Skip("not running on NixOS with system.configurationRevision set")
	}

	rev, err := getCurrentSystemRevision()
	if err != nil {
		t.Fatal(err)
	}

	// Just check it returns something reasonable
	t.Logf("current system revision: %s", rev)
}

func TestFlakeLocksUnmarshal(t *testing.T) {
	jsonData := `{
		"revision": "abc1234567890",
		"locks": {
			"nodes": {
				"nixpkgs": {
					"locked": {
						"lastModified": 1700000000,
						"rev": "def4567890123",
						"type": "github"
					}
				},
				"home-manager": {
					"locked": {
						"lastModified": 1699000000,
						"rev": "ghi7890123456",
						"type": "github"
					}
				},
				"root": {
					"inputs": {
						"nixpkgs": "nixpkgs",
						"home-manager": "home-manager"
					}
				}
			},
			"root": "root"
		}
	}`

	var data flakeMetadata
	if err := json.Unmarshal([]byte(jsonData), &data); err != nil {
		t.Fatal(err)
	}

	if data.Revision != "abc1234567890" {
		t.Errorf("expected revision abc1234567890, got %s", data.Revision)
	}

	if len(data.Locks.Nodes) != 3 {
		t.Errorf("expected 3 nodes, got %d", len(data.Locks.Nodes))
	}

	nixpkgs := data.Locks.Nodes["nixpkgs"]
	if nixpkgs.Locked == nil {
		t.Fatal("expected nixpkgs to have locked info")
	}
	if nixpkgs.Locked.LastModified != 1700000000 {
		t.Errorf("expected lastModified 1700000000, got %d", nixpkgs.Locked.LastModified)
	}
	if nixpkgs.Locked.Rev != "def4567890123" {
		t.Errorf("expected rev def4567890123, got %s", nixpkgs.Locked.Rev)
	}
	if nixpkgs.Locked.Type != "github" {
		t.Errorf("expected type github, got %s", nixpkgs.Locked.Type)
	}
}