package main

import (
	"database/sql"
	"log"
	"net/http"

	"git.squidspirit.com/squid/blog.git/backend/internal/adapter/repository"
	"git.squidspirit.com/squid/blog.git/backend/internal/application"
	"git.squidspirit.com/squid/blog.git/backend/internal/framework/api/graph"
	"git.squidspirit.com/squid/blog.git/backend/internal/framework/db/postgres"
	"git.squidspirit.com/squid/blog.git/backend/internal/pkg/env"
	"github.com/99designs/gqlgen/graphql/handler"
	"github.com/99designs/gqlgen/graphql/handler/extension"
	"github.com/99designs/gqlgen/graphql/handler/lru"
	"github.com/99designs/gqlgen/graphql/handler/transport"
	"github.com/99designs/gqlgen/graphql/playground"
	_ "github.com/lib/pq"
	"github.com/vektah/gqlparser/v2/ast"
)

func main() {
	db, err := postgres.Connect(env.GetDSN())
	if err != nil {
		log.Fatal(err)
	}

	initGraphqlHandler(createResolver(db))

	port := env.GetPort()
	log.Printf("connect to http://localhost:%s/ for GraphQL playground", port)
	log.Fatal(http.ListenAndServe(":"+port, nil))
}

func initGraphqlHandler(resolver *graph.Resolver) *handler.Server {
	srv := handler.New(graph.NewExecutableSchema(graph.Config{Resolvers: resolver}))

	srv.AddTransport(transport.Options{})
	srv.AddTransport(transport.GET{})
	srv.AddTransport(transport.POST{})

	srv.SetQueryCache(lru.New[*ast.QueryDocument](1000))

	srv.Use(extension.Introspection{})
	srv.Use(extension.AutomaticPersistedQuery{
		Cache: lru.New[string](100),
	})

	http.Handle("/", playground.Handler("GraphQL playground", "/query"))
	http.Handle("/query", srv)

	return srv
}

func createResolver(db *sql.DB) *graph.Resolver {
	postRepo := repository.NewPostRepo(postgres.NewPostDBService(db))

	return &graph.Resolver{
		GetAllPostsUseCase: application.NewGetAllPostsUseCase(postRepo),
	}
}