from os.path import join
from jinja2 import Template

from workspace_tools.paths import TOOLS_DATA, MBED_RPC

RPC_TEMPLATES_PATH = join(TOOLS_DATA, "rpc")

RPC_TEMPLATE = "RPCClasses.h"
CLASS_TEMPLATE = "class.cpp"
RPC_CLASSES_PATH = join(MBED_RPC, RPC_TEMPLATE)


def get_template(name):
    return Template(open(join(RPC_TEMPLATES_PATH, name)).read())


def write_rpc_classes(classes):
    template = get_template(RPC_TEMPLATE)
    open(RPC_CLASSES_PATH, "w").write(template.render({"classes":classes}))


RPC_CLASSES = (
    {
        "name": "DigitalOut",
        "cons_args": ["PinName"],
        "methods": [
            (None , "write", ["int"]),
            ("int", "read" , []),
        ]
    },
    {
        "name": "DigitalIn",
        "cons_args": ["PinName"],
        "methods": [
            ("int", "read" , []),
        ]
    },
    {
        "name": "DigitalInOut",
        "cons_args": ["PinName"],
        "methods": [
            ("int", "read"  , []),
            (None , "write" , ["int"]),
            (None , "input" , []),
            (None , "output", []),
        ]
    },
    {
        "name": "AnalogIn",
        "required": "ANALOGIN",
        "cons_args": ["PinName"],
        "methods": [
            ("float"         , "read"    , []),
            ("unsigned short", "read_u16", []),
        ]
    },
    {
        "name": "AnalogOut",
        "required": "ANALOGOUT",
        "cons_args": ["PinName"],
        "methods": [
            ("float", "read"     , []),
            (None   , "write"    , ["float"]),
            (None   , "write_u16", ["unsigned short"]),
        ]
    },
    {
        "name": "PwmOut",
        "required": "PWMOUT",
        "cons_args": ["PinName"],
        "methods": [
            ("float", "read"         , []),
            (None   , "write"        , ["float"]),
            (None   , "period"       , ["float"]),
            (None   , "period_ms"    , ["int"]),
            (None   , "pulsewidth"   , ["float"]),
            (None   , "pulsewidth_ms", ["int"]),
        ]
    },
    {
        "name": "SPI",
        "required": "SPI",
        "cons_args": ["PinName", "PinName", "PinName"],
        "methods": [
            (None , "format"   , ["int", "int"]),
            (None , "frequency", ["int"]),
            ("int", "write"    , ["int"]),
        ]
    },
    {
        "name": "Serial",
        "required": "SERIAL",
        "cons_args": ["PinName", "PinName"],
        "methods": [
            (None , "baud"     , ["int"]),
            ("int", "readable" , []),
            ("int", "writeable", []),
            ("int", "putc"     , ["int"]),
            ("int", "getc"     , []),
            ("int", "puts"     , ["const char *"]),
        ]
    },
    {
        "name": "Timer",
        "cons_args": [],
        "methods": [
            (None   , "start"  , []),
            (None   , "stop"   , []),
            (None   , "reset"  , []),
            ("float", "read"   , []),
            ("int"  , "read_ms", []),
            ("int"  , "read_us", []),
        ]
    }
)


def get_args_proto(args_types, extra=None):
    args = ["%s a%d" % (s, n) for n, s in enumerate(args_types)]
    if extra:
        args.extend(extra)
    return ', '.join(args)


def get_args_call(args):
    return ', '.join(["a%d"    % (n)    for n in range(len(args))])


classes = []
class_template = get_template(CLASS_TEMPLATE)

for c in RPC_CLASSES:
    c_args = c['cons_args']
    data = {
        'name': c['name'],
        'cons_type': ', '.join(c_args + ['const char*']),
        "cons_proto": get_args_proto(c_args, ["const char *name=NULL"]),
        "cons_call": get_args_call(c_args)
    }
    
    c_name = "Rpc" +  c['name']
    
    methods = []
    rpc_methods = []
    for r, m, a in c['methods']:
        ret_proto = r if r else "void"
        args_proto = "void"
        
        ret_defin = "return " if r else ""
        args_defin = ""
        
        if a:
            args_proto = get_args_proto(a)
            args_defin = get_args_call(a)
        
        proto = "%s %s(%s)"   % (ret_proto, m, args_proto)
        defin = "{%so.%s(%s);}" % (ret_defin, m, args_defin)
        methods.append("%s %s" % (proto, defin))
        
        rpc_method_type = [r] if r else []
        rpc_method_type.append(c_name)
        rpc_method_type.extend(a)
        rpc_methods.append('{"%s", rpc_method_caller<%s, &%s::%s>}' % (m, ', '.join(rpc_method_type), c_name, m))
    
    data['methods'] = "\n    ".join(methods)
    data['rpc_methods'] = ",\n            ".join(rpc_methods)
    
    class_decl = class_template.render(data)
    if 'required' in c:
        class_decl = "#if DEVICE_%s\n%s\n#endif" % (c['required'], class_decl)
    
    classes.append(class_decl)

write_rpc_classes('\n\n'.join(classes))
