#
# Copyright (c) 2017 Advanced Micro Devices, Inc.
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from slicc.ast.StatementAST import StatementAST
from slicc.symbols import Var

class DeferEnqueueingStatementAST(StatementAST):
    def __init__(self, slicc, queue_name, type_ast, statements):
        super().__init__(slicc)

        self.queue_name = queue_name
        self.type_ast = type_ast
        self.statements = statements

    def __repr__(self):
        return "[DeferEnqueueingStatementAst: %s %s %s]" % \
               (self.queue_name, self.type_ast.ident, self.statements)

    def generate(self, code, return_type, **kwargs):
        code("{")
        code.indent()
        self.symtab.pushFrame()

        msg_type = self.type_ast.type

        # Add new local var to symbol table
        v = Var(self.symtab, "out_msg", self.location, msg_type, "*out_msg",
                self.pairs)
        self.symtab.newSymbol(v)

        # Declare message
        code("std::shared_ptr<${{msg_type.c_ident}}> out_msg = "\
             "std::make_shared<${{msg_type.c_ident}}>(clockEdge());")

        # The other statements
        t = self.statements.generate(code, None)
        self.queue_name.assertType("OutPort")

        code("(${{self.queue_name.var.code}}).deferEnqueueingMessage(addr, "\
             "out_msg);")

        # End scope
        self.symtab.popFrame()
        code.dedent()
        code("}")

    def findResources(self, resources):
        var = self.queue_name.var
        res_count = int(resources.get(var, 0))
        resources[var] = str(res_count + 1)