package brain_test

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

	"github.com/mathiasbq/supervisor/internal/brain"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestQueryEmptyBaseURL(t *testing.T) {
	result, err := brain.Query(context.Background(), "", "tdd patterns", 3)
	require.NoError(t, err)
	assert.Empty(t, result)
}

func TestQueryEmptyQuery(t *testing.T) {
	result, err := brain.Query(context.Background(), "http://localhost:9999", "", 3)
	require.NoError(t, err)
	assert.Empty(t, result)
}

func TestQueryFormatsResults(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		assert.Equal(t, "/query", r.URL.Path)
		var req map[string]any
		require.NoError(t, json.NewDecoder(r.Body).Decode(&req))
		assert.Equal(t, "tdd patterns", req["query"])

		json.NewEncoder(w).Encode(map[string]any{ //nolint:errcheck
			"results": []map[string]any{
				{"path": "knowledge/tdd.md", "title": "TDD Guide", "excerpt": "Always write tests first.", "score": 5},
				{"path": "knowledge/go.md", "title": "Go Conventions", "excerpt": "Use table-driven tests.", "score": 3},
			},
		})
	}))
	defer srv.Close()

	result, err := brain.Query(context.Background(), srv.URL, "tdd patterns", 3)
	require.NoError(t, err)
	assert.Contains(t, result, "## Relevant knowledge")
	assert.Contains(t, result, "TDD Guide")
	assert.Contains(t, result, "Always write tests first.")
	assert.Contains(t, result, "Go Conventions")
}

func TestQueryEmptyResults(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		json.NewEncoder(w).Encode(map[string]any{"results": []any{}}) //nolint:errcheck
	}))
	defer srv.Close()

	result, err := brain.Query(context.Background(), srv.URL, "obscure query", 3)
	require.NoError(t, err)
	assert.Empty(t, result)
}

func TestQueryUnavailableServerReturnsEmpty(t *testing.T) {
	// Brain unavailable — should degrade gracefully, no error
	result, err := brain.Query(context.Background(), "http://127.0.0.1:19999", "query", 3)
	require.NoError(t, err)
	assert.Empty(t, result)
}