package search

import (
	"context"
	"encoding/json"
	"io"
	"net/http"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/gochat/gochat/internal/model"
)

type roundTripFunc func(*http.Request) (*http.Response, error)

func (f roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
	return f(req)
}

func jsonResponse(status int, body string) *http.Response {
	return &http.Response{
		StatusCode: status,
		Header:     http.Header{"Content-Type": []string{"application/json"}},
		Body:       io.NopCloser(strings.NewReader(body)),
	}
}

func TestNewSearchEngine_DefaultsToMeilisearch(t *testing.T) {
	engine, err := NewSearchEngine(EngineConfig{}, nil)
	require.NoError(t, err)
	_, ok := engine.(*MeiliSearchEngine)
	assert.True(t, ok)
}

func TestNewSearchEngine_DBFallbackRequiresRepo(t *testing.T) {
	engine, err := NewSearchEngine(EngineConfig{Engine: EngineDB}, nil)
	assert.Error(t, err)
	assert.Nil(t, engine)
}

func TestDocumentBuildersSetStableUIDAndType(t *testing.T) {
	conv := makeConversation(12, 3, "open", "billing,urgent")
	conv.InboxID = 7
	conv.ContactID = 9
	doc := ConversationDocument(conv)

	assert.Equal(t, "3:conversation:12", doc.UID)
	assert.Equal(t, ResultTypeConversation, doc.Type)
	assert.Equal(t, uint(3), doc.AccountID)
	assert.Equal(t, []string{"billing", "urgent"}, doc.Labels)
}

func TestMeiliSearchEngine_SearchSendsScopedFilter(t *testing.T) {
	var requestBody map[string]interface{}
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		require.Equal(t, "/indexes/gochat_contacts/search", r.URL.Path)
		require.NoError(t, json.NewDecoder(r.Body).Decode(&requestBody))
		return jsonResponse(http.StatusOK, `{
			"hits":[{"uid":"42:contact:9","id":9,"type":"contact","account_id":42,"snippet":"Ada Lovelace","_rankingScore":0.98}],
			"estimatedTotalHits":1
		}`), nil
	})

	engine := NewMeiliSearchEngine(EngineConfig{Host: "http://meili.test", IndexPrefix: "gochat_"})
	engine.client.SetTransport(transport)
	filter := &SearchFilter{Page: 1, PerPage: 10, Types: []SearchResultType{ResultTypeContact}}
	resp, err := engine.Search(context.Background(), 42, "ada", filter)

	require.NoError(t, err)
	assert.Equal(t, int64(1), resp.TotalCount)
	assert.Len(t, resp.Results, 1)
	assert.Equal(t, uint(9), resp.Results[0].ID)
	assert.Equal(t, "account_id = 42", requestBody["filter"])
	assert.Equal(t, "ada", requestBody["q"])
}

func TestMeiliSearchEngine_SearchSendsMessageSenderIDFilter(t *testing.T) {
	var requestBody map[string]interface{}
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		require.Equal(t, "/indexes/gochat_messages/search", r.URL.Path)
		require.NoError(t, json.NewDecoder(r.Body).Decode(&requestBody))
		return jsonResponse(http.StatusOK, `{"hits":[],"estimatedTotalHits":0}`), nil
	})

	engine := NewMeiliSearchEngine(EngineConfig{Host: "http://meili.test", IndexPrefix: "gochat_"})
	engine.client.SetTransport(transport)
	senderID := uint(77)
	filter := &SearchFilter{Page: 1, PerPage: 10, Types: []SearchResultType{ResultTypeMessage}, SenderType: "contact", SenderID: &senderID}
	_, err := engine.Search(context.Background(), 42, "hello", filter)

	require.NoError(t, err)
	assert.Equal(t, "account_id = 42 AND sender_type = \"contact\" AND sender_id = 77", requestBody["filter"])
}

func TestMeiliSearchEngine_IndexAndDeleteDocument(t *testing.T) {
	seen := []string{}
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		seen = append(seen, r.Method+" "+r.URL.Path)
		return jsonResponse(http.StatusAccepted, `{"taskUid":1}`), nil
	})

	engine := NewMeiliSearchEngine(EngineConfig{Host: "http://meili.test", IndexPrefix: "gochat_"})
	engine.client.SetTransport(transport)
	doc := ContactDocument(model.Contact{Base: model.Base{ID: 5}, AccountID: 2, Name: "Grace"})
	require.NoError(t, engine.IndexDocument(context.Background(), doc))
	require.NoError(t, engine.DeleteDocument(context.Background(), ResultTypeContact, 2, 5))

	assert.Equal(t, []string{
		"POST /indexes/gochat_contacts/documents",
		"DELETE /indexes/gochat_contacts/documents/2:contact:5",
	}, seen)
}

func TestMeiliSearchEngine_BootstrapCreatesMissingIndexesAndSettings(t *testing.T) {
	created := 0
	settings := 0
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		switch {
		case r.Method == http.MethodGet && strings.HasPrefix(r.URL.Path, "/indexes/"):
			return jsonResponse(http.StatusNotFound, `{"message":"not found"}`), nil
		case r.Method == http.MethodPost && r.URL.Path == "/indexes":
			created++
			return jsonResponse(http.StatusAccepted, `{"taskUid":1}`), nil
		case r.Method == http.MethodPatch && strings.HasSuffix(r.URL.Path, "/settings"):
			settings++
			return jsonResponse(http.StatusAccepted, `{"taskUid":2}`), nil
		default:
			t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
			return nil, nil
		}
	})

	engine := NewMeiliSearchEngine(EngineConfig{Host: "http://meili.test", IndexPrefix: "gochat_"})
	engine.client.SetTransport(transport)
	require.NoError(t, engine.Bootstrap(context.Background()))
	assert.Equal(t, len(searchableTypes(nil)), created)
	assert.Equal(t, len(searchableTypes(nil)), settings)
}