class Spoom::LSP::Client

def close
  send(Request.new(next_id, "shutdown", {}))
  @in.close
  @out.close
  @err.close
  @open = false
end

def definitions(uri, line, column)
  json = send(Request.new(
    next_id,
    "textDocument/definition",
    {
      "textDocument" => {
        "uri" => uri,
      },
      "position" => {
        "line" => line,
        "character" => column,
      },
    },
  ))
  return [] unless json && json["result"]
  json["result"].map { |loc| Location.from_json(loc) }
end

def document_symbols(uri)
  json = send(Request.new(
    next_id,
    "textDocument/documentSymbol",
    {
      "textDocument" => {
        "uri" => uri,
      },
    },
  ))
  return [] unless json && json["result"]
  json["result"].map { |loc| DocumentSymbol.from_json(loc) }
end

def hover(uri, line, column)
  json = send(Request.new(
    next_id,
    "textDocument/hover",
    {
      "textDocument" => {
        "uri" => uri,
      },
      "position" => {
        "line" => line,
        "character" => column,
      },
    },
  ))
  return unless json && json["result"]
  Hover.from_json(json["result"])
end

def initialize(sorbet_bin, *sorbet_args, path: ".")
  @id = T.let(0, Integer)
  @open = T.let(false, T::Boolean)
  io_in, io_out, io_err, _status = T.unsafe(Open3).popen3(sorbet_bin, *sorbet_args, chdir: path)
  @in = T.let(io_in, IO)
  @out = T.let(io_out, IO)
  @err = T.let(io_err, IO)
end

def next_id
  @id += 1
end

def open(workspace_path)
  raise Error::AlreadyOpen, "Error: CLI already opened" if @open
  send(Request.new(
    next_id,
    "initialize",
    {
      "rootPath" => workspace_path,
      "rootUri" => "file://#{workspace_path}",
      "capabilities" => {},
    },
  ))
  send(Notification.new("initialized", {}))
  @open = true
end

def read
  raw_string = read_raw
  return unless raw_string
  json = JSON.parse(raw_string)
  # Handle error in the LSP protocol
  raise ResponseError.from_json(json["error"]) if json["error"]
  # Handle typechecking errors
  raise Error::Diagnostics.from_json(json["params"]) if json["method"] == "textDocument/publishDiagnostics"
  json
end

def read_raw
  header = @out.gets
  # Sorbet returned an error and forgot to answer
  raise Error::BadHeaders, "bad response headers" unless header&.match?(/Content-Length: /)
  len = header.slice(::Range.new(16, nil)).to_i
  @out.read(len + 2) # +2 'cause of the final \r\n
end

def references(uri, line, column, include_decl = true)
  json = send(Request.new(
    next_id,
    "textDocument/references",
    {
      "textDocument" => {
        "uri" => uri,
      },
      "position" => {
        "line" => line,
        "character" => column,
      },
      "context" => {
        "includeDeclaration" => include_decl,
      },
    },
  ))
  return [] unless json && json["result"]
  json["result"].map { |loc| Location.from_json(loc) }
end

def send(message)
  send_raw(message.to_json)
  read if message.is_a?(Request)
end

def send_raw(json_string)
  @in.puts("Content-Length:#{json_string.length}\r\n\r\n#{json_string}")
end

def signatures(uri, line, column)
  json = send(Request.new(
    next_id,
    "textDocument/signatureHelp",
    {
      "textDocument" => {
        "uri" => uri,
      },
      "position" => {
        "line" => line,
        "character" => column,
      },
    },
  ))
  return [] unless json && json["result"] && json["result"]["signatures"]
  json["result"]["signatures"].map { |loc| SignatureHelp.from_json(loc) }
end

def symbols(query)
  json = send(Request.new(
    next_id,
    "workspace/symbol",
    {
      "query" => query,
    },
  ))
  return [] unless json && json["result"]
  json["result"].map { |loc| DocumentSymbol.from_json(loc) }
end

def type_definitions(uri, line, column)
  json = send(Request.new(
    next_id,
    "textDocument/typeDefinition",
    {
      "textDocument" => {
        "uri" => uri,
      },
      "position" => {
        "line" => line,
        "character" => column,
      },
    },
  ))
  return [] unless json && json["result"]
  json["result"].map { |loc| Location.from_json(loc) }
end