package sink

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

func TestStoreWriteCreatesAtomicFile(t *testing.T) {
	dir := t.TempDir()
	s := Store{DataDir: dir}

	payload := map[string]any{"workflow_id": "WF-0042", "amount": 42.5}
	res, err := s.Write("decision-abc", payload)
	if err != nil {
		t.Fatalf("Write: %v", err)
	}
	want := filepath.Join(dir, "decision-abc.json")
	if res.Path != want {
		t.Fatalf("Path = %q, want %q", res.Path, want)
	}

	raw, err := os.ReadFile(res.Path)
	if err != nil {
		t.Fatalf("ReadFile: %v", err)
	}
	var got map[string]any
	if err := json.Unmarshal(raw, &got); err != nil {
		t.Fatalf("json.Unmarshal: %v", err)
	}
	if got["workflow_id"] != "WF-0042" {
		t.Fatalf("workflow_id = %v, want WF-0042", got["workflow_id"])
	}
	if got["amount"].(float64) != 42.5 {
		t.Fatalf("amount = %v, want 42.5", got["amount"])
	}

	// No lingering .tmp.
	entries, _ := os.ReadDir(dir)
	for _, e := range entries {
		if filepath.Ext(e.Name()) == ".tmp" {
			t.Fatalf("left stray tmp file %q", e.Name())
		}
	}
}

func TestStoreWriteRejectsPathTraversal(t *testing.T) {
	s := Store{DataDir: t.TempDir()}
	for _, bad := range []string{
		"",
		"../etc/passwd",
		"./x",
		"with/slash",
		"with:colon-but-starts-with-/",
	} {
		_, err := s.Write(bad, map[string]any{"a": 1})
		if err == nil {
			t.Fatalf("Write(%q) = nil err, want rejection", bad)
		}
	}
}

func TestStoreWriteOverwritesExisting(t *testing.T) {
	dir := t.TempDir()
	s := Store{DataDir: dir}

	if _, err := s.Write("dec1", map[string]any{"v": 1}); err != nil {
		t.Fatalf("first Write: %v", err)
	}
	if _, err := s.Write("dec1", map[string]any{"v": 2}); err != nil {
		t.Fatalf("second Write: %v", err)
	}

	raw, err := os.ReadFile(filepath.Join(dir, "dec1.json"))
	if err != nil {
		t.Fatalf("ReadFile: %v", err)
	}
	var got map[string]any
	_ = json.Unmarshal(raw, &got)
	if got["v"].(float64) != 2 {
		t.Fatalf("v = %v, want 2", got["v"])
	}
}