package embed_test

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/mathiasbq/hyperguild/ingestion/internal/embed"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestNew_EmptyURLReturnsNil(t *testing.T) {
	assert.Nil(t, embed.New("", "model"))
}

func TestEmbed_ReturnsVector(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		assert.Equal(t, "/api/embed", r.URL.Path)
		var req map[string]any
		require.NoError(t, json.NewDecoder(r.Body).Decode(&req))
		assert.Equal(t, "nomic", req["model"])
		assert.Equal(t, "hello", req["input"])
		_ = json.NewEncoder(w).Encode(map[string]any{
			"embeddings": [][]float32{{0.1, 0.2, 0.3}},
		})
	}))
	defer srv.Close()

	c := embed.New(srv.URL, "nomic")
	require.NotNil(t, c)
	v, err := c.Embed(context.Background(), "hello")
	require.NoError(t, err)
	assert.Equal(t, []float32{0.1, 0.2, 0.3}, v)
}

func TestEmbed_StripsTrailingSlashFromURL(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		assert.Equal(t, "/api/embed", r.URL.Path)
		_ = json.NewEncoder(w).Encode(map[string]any{"embeddings": [][]float32{{1.0}}})
	}))
	defer srv.Close()
	c := embed.New(srv.URL+"/", "nomic")
	_, err := c.Embed(context.Background(), "x")
	require.NoError(t, err)
}

func TestEmbed_PropagatesUpstreamError(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusBadGateway)
	}))
	defer srv.Close()
	c := embed.New(srv.URL, "m")
	_, err := c.Embed(context.Background(), "x")
	require.Error(t, err)
}

func TestEmbed_RejectsEmptyEmbeddingsArray(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		_ = json.NewEncoder(w).Encode(map[string]any{"embeddings": [][]float32{}})
	}))
	defer srv.Close()
	c := embed.New(srv.URL, "m")
	_, err := c.Embed(context.Background(), "x")
	require.Error(t, err)
}

func TestEmbed_RejectsEmptyText(t *testing.T) {
	c := embed.New("http://127.0.0.1:1", "m")
	_, err := c.Embed(context.Background(), "")
	require.Error(t, err)
}