move routes handler module to its own file

1 files changed, 63 insertions, 0 deletions

diff --git a/lib/handler.ml b/lib/handler.ml
new file mode 100644
index 0000000..4ee7189
--- /dev/null
+++ b/lib/handler.ml
@@ -0,0 +1,63 @@
+open Piaf
+
+let create_transaction client_id (db_pool : Query.pool) (request : Request.t) =
+  Caqti_eio.Pool.use
+    (fun conn ->
+      let client_opt =
+        Option.join @@ Result.to_option @@ Query.find_client client_id conn
+      in
+      match client_opt with
+      | Some _client ->
+        let insert_result =
+          let body = Result.to_option @@ Body.to_string request.body in
+          let json = Option.map Yojson.Safe.from_string body in
+          let decoded_op = Option.bind json (Utils.Decoder.decode Operation.decoder) in
+          match decoded_op with
+          | Some op ->
+            (match Query.execute_operation ~client_id ~op conn with
+             | Ok _ as ok -> ok
+             | Error e -> Error (`DB e))
+          | None -> Error (`Decoder "Invalid operation")
+        in
+        (match insert_result with
+         | Ok () ->
+           let json : Yojson.Safe.t =
+             `Assoc [ "limite", `Int 100000; "saldo", `Int (-9098) ]
+           in
+           Ok (Response.of_string ~body:(Yojson.Safe.to_string json) `OK)
+         | Error _ -> Ok (Response.create (`Code 422)))
+      | None -> Ok (Response.create `Not_found))
+    db_pool
+;;
+
+let get_balance client_id (db_pool : Query.pool) (_request : Request.t) =
+  Caqti_eio.Pool.use
+    (fun conn ->
+      let client_opt =
+        Option.join @@ Result.to_option @@ Query.find_client client_id conn
+      in
+      match client_opt with
+      | Some _client ->
+        let client_balance_opt =
+          Option.join @@ Result.to_option @@ Query.balance client_id conn
+        in
+        (match client_balance_opt with
+         | Some (balance_value, time) ->
+           let json : Yojson.Safe.t =
+             let balance =
+               let total = `Int balance_value in
+               let date =
+                 `String
+                   (Format.asprintf "%a" (Ptime.pp_rfc3339 ~tz_offset_s:(-10800) ()) time)
+               in
+               let limit = `Int 100000 in
+               `Assoc [ "total", total; "data_extrato", date; "limite", limit ]
+             in
+             let last_transactions = `List [] in
+             `Assoc [ "saldo", balance; "ultimas_transacoes", last_transactions ]
+           in
+           Ok (Response.of_string ~body:(Yojson.Safe.to_string json) `OK)
+         | None -> Ok (Response.create `Not_found))
+      | None -> Ok (Response.create `Not_found))
+    db_pool
+;;