#!/usr/bin/env python3
import glob
import json
import os
import argparse

ARG_TYPES = {
    "string": "ARG_TYPE_STRING",
    "integer": "ARG_TYPE_INTEGER",
    "double": "ARG_TYPE_DOUBLE",
    "key": "ARG_TYPE_KEY",
    "pattern": "ARG_TYPE_PATTERN",
    "unix-time": "ARG_TYPE_UNIX_TIME",
    "pure-token": "ARG_TYPE_PURE_TOKEN",
    "oneof": "ARG_TYPE_ONEOF",
    "block": "ARG_TYPE_BLOCK",
}

GROUPS = {
    "generic": "COMMAND_GROUP_GENERIC",
    "string": "COMMAND_GROUP_STRING",
    "list": "COMMAND_GROUP_LIST",
    "set": "COMMAND_GROUP_SET",
    "sorted_set": "COMMAND_GROUP_SORTED_SET",
    "hash": "COMMAND_GROUP_HASH",
    "pubsub": "COMMAND_GROUP_PUBSUB",
    "transactions": "COMMAND_GROUP_TRANSACTIONS",
    "connection": "COMMAND_GROUP_CONNECTION",
    "server": "COMMAND_GROUP_SERVER",
    "scripting": "COMMAND_GROUP_SCRIPTING",
    "hyperloglog": "COMMAND_GROUP_HYPERLOGLOG",
    "cluster": "COMMAND_GROUP_CLUSTER",
    "sentinel": "COMMAND_GROUP_SENTINEL",
    "geo": "COMMAND_GROUP_GEO",
    "stream": "COMMAND_GROUP_STREAM",
    "bitmap": "COMMAND_GROUP_BITMAP",
}


def get_optional_desc_string(desc, field, force_uppercase=False):
    v = desc.get(field, None)
    if v and force_uppercase:
        v = v.upper()
    ret = "\"%s\"" % v if v else "NULL"
    return ret.replace("\n", "\\n")


def check_command_args_key_specs(args, command_key_specs_index_set, command_arg_key_specs_index_set):
    if not args:
        return True

    for arg in args:
        if arg.key_spec_index is not None:
            assert isinstance(arg.key_spec_index, int)

            if arg.key_spec_index not in command_key_specs_index_set:
                print("command: %s arg: %s key_spec_index error" % (command.fullname(), arg.name))
                return False

            command_arg_key_specs_index_set.add(arg.key_spec_index)

        if not check_command_args_key_specs(arg.subargs, command_key_specs_index_set, command_arg_key_specs_index_set):
            return False

    return True

def check_command_key_specs(command):
    if not command.key_specs:
        return True

    assert isinstance(command.key_specs, list)

    for cmd_key_spec in command.key_specs:
        if "flags" not in cmd_key_spec:
            print("command: %s key_specs missing flags" % command.fullname())
            return False

        if "NOT_KEY" in cmd_key_spec["flags"]:
            # Like SUNSUBSCRIBE / SPUBLISH / SSUBSCRIBE
            return True

    command_key_specs_index_set = set(range(len(command.key_specs)))
    command_arg_key_specs_index_set = set()

    # Collect key_spec used for each arg, including arg.subarg
    if not check_command_args_key_specs(command.args, command_key_specs_index_set, command_arg_key_specs_index_set):
        return False

    # Check if we have key_specs not used
    if command_key_specs_index_set != command_arg_key_specs_index_set:
        print("command: %s may have unused key_spec" % command.fullname())
        return False

    return True


def check_acl_categories(command):
    """
    Validate that ACL categories in JSON files follow rules:
    
    1. WRITE flag and WRITE category must match
    2. READONLY flag (and NOT SCRIPTING category) requires READ category
    3. ADMIN flag requires ADMIN and DANGEROUS categories
    4. PUBSUB flag and PUBSUB category must match
    5. FAST flag and FAST category must match
    6. BLOCKING flag and BLOCKING category must match
    7. Commands cannot be both FAST and SLOW
    8. Commands without FAST category must have SLOW category
    """
    command_flags = set(command.desc.get("command_flags", []))
    acl_categories = set(command.desc.get("acl_categories", []))
    
    errors = []
    
    if ("WRITE" in command_flags) != ("WRITE" in acl_categories):
        errors.append("WRITE flag and WRITE category must match")
    
    if "READONLY" in command_flags and "SCRIPTING" not in acl_categories:
        if "READ" not in acl_categories:
            errors.append("READONLY flag (without SCRIPTING category) requires READ category")
    
    if "ADMIN" in command_flags:
        if "ADMIN" not in acl_categories:
            errors.append("ADMIN flag requires ADMIN category")
        if "DANGEROUS" not in acl_categories:
            errors.append("ADMIN flag requires DANGEROUS category")
    
    if ("PUBSUB" in command_flags) != ("PUBSUB" in acl_categories):
        errors.append("PUBSUB flag and PUBSUB category must match")
    
    if ("FAST" in command_flags) != ("FAST" in acl_categories):
        errors.append("FAST flag and FAST category must match")
    
    if ("BLOCKING" in command_flags) != ("BLOCKING" in acl_categories):
        errors.append("BLOCKING flag and BLOCKING category must match")
    
    if "FAST" in acl_categories and "SLOW" in acl_categories:
        errors.append("Command cannot be both FAST and SLOW")
    
    if "FAST" not in acl_categories and "SLOW" not in acl_categories:
        errors.append("Commands without FAST category must have SLOW category")
    
    if errors:
        print("command: %s - ACL category validation errors:" % command.fullname())
        for error in errors:
            print("  - %s" % error)
        return False
    
    return True


# Globals
subcommands = {}  # container_name -> dict(subcommand_name -> Subcommand) - Only subcommands
commands = {}  # command_name -> Command - Only commands


class KeySpec(object):
    def __init__(self, spec):
        self.spec = spec

    def struct_code(self):
        def _flags_code():
            s = ""
            for flag in self.spec.get("flags", []):
                s += "CMD_KEY_%s|" % flag
            return s[:-1] if s else 0

        def _begin_search_code():
            if self.spec["begin_search"].get("index"):
                return "KSPEC_BS_INDEX,.bs.index={%d}" % (
                    self.spec["begin_search"]["index"]["pos"]
                )
            elif self.spec["begin_search"].get("keyword"):
                return "KSPEC_BS_KEYWORD,.bs.keyword={\"%s\",%d}" % (
                    self.spec["begin_search"]["keyword"]["keyword"],
                    self.spec["begin_search"]["keyword"]["startfrom"],
                )
            elif "unknown" in self.spec["begin_search"]:
                return "KSPEC_BS_UNKNOWN,{{0}}"
            else:
                print("Invalid begin_search! value=%s" % self.spec["begin_search"])
                exit(1)

        def _find_keys_code():
            if self.spec["find_keys"].get("range"):
                return "KSPEC_FK_RANGE,.fk.range={%d,%d,%d}" % (
                    self.spec["find_keys"]["range"]["lastkey"],
                    self.spec["find_keys"]["range"]["step"],
                    self.spec["find_keys"]["range"]["limit"]
                )
            elif self.spec["find_keys"].get("keynum"):
                return "KSPEC_FK_KEYNUM,.fk.keynum={%d,%d,%d}" % (
                    self.spec["find_keys"]["keynum"]["keynumidx"],
                    self.spec["find_keys"]["keynum"]["firstkey"],
                    self.spec["find_keys"]["keynum"]["step"]
                )
            elif "unknown" in self.spec["find_keys"]:
                return "KSPEC_FK_UNKNOWN,{{0}}"
            else:
                print("Invalid find_keys! value=%s" % self.spec["find_keys"])
                exit(1)

        return "%s,%s,%s,%s" % (
            get_optional_desc_string(self.spec, "notes"),
            _flags_code(),
            _begin_search_code(),
            _find_keys_code()
        )


def verify_no_dup_names(container_fullname, args):
    name_list = [arg.name for arg in args]
    name_set = set(name_list)
    if len(name_list) != len(name_set):
        print("{}: Dup argument names: {}".format(container_fullname, name_list))
        exit(1)


class Argument(object):
    def __init__(self, parent_name, desc):
        self.parent_name = parent_name
        self.desc = desc
        self.name = self.desc["name"].lower()
        if "_" in self.name:
            print("{}: name ({}) should not contain underscores".format(self.fullname(), self.name))
            exit(1)
        self.type = self.desc["type"]
        self.key_spec_index = self.desc.get("key_spec_index", None)
        self.subargs = []
        if self.type in ["oneof", "block"]:
            self.display = None
            for subdesc in self.desc["arguments"]:
                self.subargs.append(Argument(self.fullname(), subdesc))
            if len(self.subargs) < 2:
                print("{}: oneof or block arg contains less than two subargs".format(self.fullname()))
                exit(1)
            verify_no_dup_names(self.fullname(), self.subargs)
        else:
            self.display = self.desc.get("display")

    def fullname(self):
        return ("%s %s" % (self.parent_name, self.name)).replace("-", "_")

    def struct_name(self):
        return "%s_Arg" % (self.fullname().replace(" ", "_"))

    def subarg_table_name(self):
        assert self.subargs
        return "%s_Subargs" % (self.fullname().replace(" ", "_"))

    def struct_code(self):
        """
        Output example:
        MAKE_ARG("expiration",ARG_TYPE_ONEOF,-1,NULL,NULL,NULL,CMD_ARG_OPTIONAL,5,NULL),.subargs=GETEX_expiration_Subargs
        """

        def _flags_code():
            s = ""
            if self.desc.get("optional", False):
                s += "CMD_ARG_OPTIONAL|"
            if self.desc.get("multiple", False):
                s += "CMD_ARG_MULTIPLE|"
            if self.desc.get("multiple_token", False):
                assert self.desc.get("multiple", False)  # Sanity
                s += "CMD_ARG_MULTIPLE_TOKEN|"
            return s[:-1] if s else "CMD_ARG_NONE"

        s = "MAKE_ARG(\"%s\",%s,%d,%s,%s,%s,%s,%d,%s)" % (
            self.name,
            ARG_TYPES[self.type],
            self.desc.get("key_spec_index", -1),
            get_optional_desc_string(self.desc, "token", force_uppercase=True),
            get_optional_desc_string(self.desc, "summary"),
            get_optional_desc_string(self.desc, "since"),
            _flags_code(),
            len(self.subargs),
            get_optional_desc_string(self.desc, "deprecated_since"),
        )
        if "display" in self.desc:
            s += ",.display_text=\"%s\"" % self.desc["display"].lower()
        if self.subargs:
            s += ",.subargs=%s" % self.subarg_table_name()

        return s

    def write_internal_structs(self, f):
        if self.subargs:
            for subarg in self.subargs:
                subarg.write_internal_structs(f)

            f.write("/* %s argument table */\n" % self.fullname())
            f.write("struct COMMAND_ARG %s[] = {\n" % self.subarg_table_name())
            for subarg in self.subargs:
                f.write("{%s},\n" % subarg.struct_code())
            f.write("};\n\n")


def to_c_name(str):
    return str.replace(":", "").replace(".", "_").replace("$", "_")\
        .replace("^", "_").replace("*", "_").replace("-", "_") \
        .replace("\\", "_").replace("+", "_")


class ReplySchema(object):
    def __init__(self, name, desc):
        self.name = to_c_name(name)
        self.schema = {}
        if desc.get("type") == "object":
            if desc.get("properties") and desc.get("additionalProperties") is None:
                print("%s: Any object that has properties should have the additionalProperties field" % self.name)
                exit(1)
        elif desc.get("type") == "array":
            if desc.get("items") and isinstance(desc["items"], list) and any([desc.get(k) is None for k in ["minItems", "maxItems"]]):
                print("%s: Any array that has items should have the minItems and maxItems fields" % self.name)
                exit(1)
        for k, v in desc.items():
            if isinstance(v, dict):
                self.schema[k] = ReplySchema("%s_%s" % (self.name, k), v)
            elif isinstance(v, list):
                self.schema[k] = []
                for i, subdesc in enumerate(v):
                    self.schema[k].append(ReplySchema("%s_%s_%i" % (self.name, k,i), subdesc))
            else:
                self.schema[k] = v
    
    def write(self, f):
        def struct_code(name, k, v):
            if isinstance(v, ReplySchema):
                t = "JSON_TYPE_OBJECT"
                vstr = ".value.object=&%s" % name
            elif isinstance(v, list):
                t = "JSON_TYPE_ARRAY"
                vstr = ".value.array={.objects=%s,.length=%d}" % (name, len(v))
            elif isinstance(v, bool):
                t = "JSON_TYPE_BOOLEAN"
                vstr = ".value.boolean=%d" % int(v)
            elif isinstance(v, str):
                t = "JSON_TYPE_STRING"
                vstr = ".value.string=\"%s\"" % v
            elif isinstance(v, int):
                t = "JSON_TYPE_INTEGER"
                vstr = ".value.integer=%d" % v
            
            return "%s,%s,%s" % (t, json.dumps(k), vstr)

        for k, v in self.schema.items():
            if isinstance(v, ReplySchema):
                v.write(f)
            elif isinstance(v, list):
                for i, schema in enumerate(v):
                    schema.write(f)
                name = to_c_name("%s_%s" % (self.name, k))
                f.write("/* %s array reply schema */\n" % name)
                f.write("struct jsonObject *%s[] = {\n" % name)
                for i, schema in enumerate(v):
                    f.write("&%s,\n" % schema.name)
                f.write("};\n\n")
            
        f.write("/* %s reply schema */\n" % self.name)
        f.write("struct jsonObjectElement %s_elements[] = {\n" % self.name)
        for k, v in self.schema.items():
            name = to_c_name("%s_%s" % (self.name, k))
            f.write("{%s},\n" % struct_code(name, k, v))
        f.write("};\n\n")
        f.write("struct jsonObject %s = {%s_elements,.length=%d};\n\n" % (self.name, self.name, len(self.schema)))


class Command(object):
    def __init__(self, name, desc):
        self.name = name.upper()
        self.desc = desc
        self.group = self.desc["group"]
        self.key_specs = self.desc.get("key_specs", [])
        self.subcommands = []
        self.args = []
        for arg_desc in self.desc.get("arguments", []):
            self.args.append(Argument(self.fullname(), arg_desc))
        verify_no_dup_names(self.fullname(), self.args)
        self.reply_schema = None
        if "reply_schema" in self.desc:
            self.reply_schema = ReplySchema(self.reply_schema_name(), self.desc["reply_schema"])

    def fullname(self):
        return self.name.replace("-", "_").replace(":", "")

    def return_types_table_name(self):
        return "%s_ReturnInfo" % self.fullname().replace(" ", "_")

    def subcommand_table_name(self):
        assert self.subcommands
        return "%s_Subcommands" % self.name

    def history_table_name(self):
        return "%s_History" % (self.fullname().replace(" ", "_"))

    def tips_table_name(self):
        return "%s_Tips" % (self.fullname().replace(" ", "_"))

    def arg_table_name(self):
        return "%s_Args" % (self.fullname().replace(" ", "_"))

    def key_specs_table_name(self):
        return "%s_Keyspecs" % (self.fullname().replace(" ", "_"))

    def reply_schema_name(self):
        return "%s_ReplySchema" % (self.fullname().replace(" ", "_"))

    def struct_name(self):
        return "%s_Command" % (self.fullname().replace(" ", "_"))

    def history_code(self):
        if not self.desc.get("history"):
            return ""
        s = ""
        for tupl in self.desc["history"]:
            s += "{\"%s\",\"%s\"},\n" % (tupl[0], tupl[1])
        return s

    def num_history(self):
        if not self.desc.get("history"):
            return 0
        return len(self.desc["history"])

    def tips_code(self):
        if not self.desc.get("command_tips"):
            return ""
        s = ""
        for hint in self.desc["command_tips"]:
            s += "\"%s\",\n" % hint.lower()
        return s

    def num_tips(self):
        if not self.desc.get("command_tips"):
            return 0
        return len(self.desc["command_tips"])

    def key_specs_code(self):
        s = ""
        for spec in self.key_specs:
            s += "{%s}," % KeySpec(spec).struct_code()
        return s[:-1]


    def struct_code(self):
        """
        Output example:
        MAKE_CMD("set","Set the string value of a key","O(1)","1.0.0",CMD_DOC_NONE,NULL,NULL,"string",COMMAND_GROUP_STRING,SET_History,4,SET_Tips,0,setCommand,-3,CMD_WRITE|CMD_DENYOOM,ACL_CATEGORY_STRING,SET_Keyspecs,1,setGetKeys,5),.args=SET_Args
        """

        def _flags_code():
            s = ""
            for flag in self.desc.get("command_flags", []):
                s += "CMD_%s|" % flag
            return s[:-1] if s else 0

        def _acl_categories_code():
            s = ""
            for cat in self.desc.get("acl_categories", []):
                s += "ACL_CATEGORY_%s|" % cat
            return s[:-1] if s else 0

        def _doc_flags_code():
            s = ""
            for flag in self.desc.get("doc_flags", []):
                s += "CMD_DOC_%s|" % flag
            return s[:-1] if s else "CMD_DOC_NONE"

        s = "MAKE_CMD(\"%s\",%s,%s,%s,%s,%s,%s,%s,%s,%s,%d,%s,%d,%s,%d,%s,%s,%s,%s,%d,%s,%d)," % (
            self.name.lower(),
            get_optional_desc_string(self.desc, "summary"),
            get_optional_desc_string(self.desc, "complexity"),
            get_optional_desc_string(self.desc, "since"),
            _doc_flags_code(),
            get_optional_desc_string(self.desc, "replaced_by"),
            get_optional_desc_string(self.desc, "deprecated_since"),
            "\"%s\"" % self.group,
            GROUPS[self.group],
            self.history_table_name(),
            self.num_history(),
            self.tips_table_name(),
            self.num_tips(),
            self.desc.get("function", "NULL"),
            self.desc["arity"],
            _flags_code(),
            _acl_categories_code(),
            self.desc.get("get_dbid_args", "NULL"),
            self.key_specs_table_name(),
            len(self.key_specs),
            self.desc.get("get_keys_function", "NULL"),
            len(self.args),
        )

        if self.subcommands:
            s += ".subcommands=%s," % self.subcommand_table_name()

        if self.args:
            s += ".args=%s," % self.arg_table_name()

        if self.reply_schema and args.with_reply_schema:
            s += ".reply_schema=&%s," % self.reply_schema_name()

        return s[:-1]

    def write_internal_structs(self, f):
        if self.subcommands:
            subcommand_list = sorted(self.subcommands, key=lambda cmd: cmd.name)
            for subcommand in subcommand_list:
                subcommand.write_internal_structs(f)

            f.write("/* %s command table */\n" % self.fullname())
            f.write("struct COMMAND_STRUCT %s[] = {\n" % self.subcommand_table_name())
            for subcommand in subcommand_list:
                f.write("{%s},\n" % subcommand.struct_code())
            f.write("{0}\n")
            f.write("};\n\n")

        f.write("/********** %s ********************/\n\n" % self.fullname())

        f.write("#ifndef SKIP_CMD_HISTORY_TABLE\n")
        f.write("/* %s history */\n" % self.fullname())
        code = self.history_code()
        if code:
            f.write("commandHistory %s[] = {\n" % self.history_table_name())
            f.write("%s" % code)
            f.write("};\n")
        else:
            f.write("#define %s NULL\n" % self.history_table_name())
        f.write("#endif\n\n")

        f.write("#ifndef SKIP_CMD_TIPS_TABLE\n")
        f.write("/* %s tips */\n" % self.fullname())
        code = self.tips_code()
        if code:
            f.write("const char *%s[] = {\n" % self.tips_table_name())
            f.write("%s" % code)
            f.write("};\n")
        else:
            f.write("#define %s NULL\n" % self.tips_table_name())
        f.write("#endif\n\n")

        f.write("#ifndef SKIP_CMD_KEY_SPECS_TABLE\n")
        f.write("/* %s key specs */\n" % self.fullname())
        code = self.key_specs_code()
        if code:
            f.write("keySpec %s[%d] = {\n" % (self.key_specs_table_name(), len(self.key_specs)))
            f.write("%s\n" % code)
            f.write("};\n")
        else:
            f.write("#define %s NULL\n" % self.key_specs_table_name())
        f.write("#endif\n\n")

        if self.args:
            for arg in self.args:
                arg.write_internal_structs(f)

            f.write("/* %s argument table */\n" % self.fullname())
            f.write("struct COMMAND_ARG %s[] = {\n" % self.arg_table_name())
            for arg in self.args:
                f.write("{%s},\n" % arg.struct_code())
            f.write("};\n\n")

        if self.reply_schema and args.with_reply_schema:
            self.reply_schema.write(f)


class Subcommand(Command):
    def __init__(self, name, desc):
        self.container_name = desc["container"].upper()
        super(Subcommand, self).__init__(name, desc)

    def fullname(self):
        return "%s %s" % (self.container_name, self.name.replace("-", "_").replace(":", ""))


def create_command(name, desc):
    if desc.get("container"):
        cmd = Subcommand(name.upper(), desc)
        subcommands.setdefault(desc["container"].upper(), {})[name] = cmd
    else:
        cmd = Command(name.upper(), desc)
        commands[name.upper()] = cmd


# MAIN

# Figure out where the sources are
srcdir = os.path.abspath(os.path.dirname(os.path.abspath(__file__)) + "/../src")

parser = argparse.ArgumentParser()
parser.add_argument('--with-reply-schema', action='store_true')
args = parser.parse_args()

# Create all command objects
print("Processing json files...")
for filename in glob.glob('%s/commands/*.json' % srcdir):
    with open(filename, "r") as f:
        try:
            d = json.load(f)
            for name, desc in d.items():
                create_command(name, desc)
        except json.decoder.JSONDecodeError as err:
            print("Error processing %s: %s" % (filename, err))
            exit(1)

# Link subcommands to containers
print("Linking container command to subcommands...")
for command in commands.values():
    assert command.group
    if command.name not in subcommands:
        continue
    for subcommand in subcommands[command.name].values():
        assert not subcommand.group or subcommand.group == command.group
        subcommand.group = command.group
        command.subcommands.append(subcommand)

check_command_error_counter = 0  # An error counter is used to count errors in command checking.

print("Checking all commands...")
for command in commands.values():
    if not check_command_key_specs(command):
        check_command_error_counter += 1
    if not check_acl_categories(command):
        check_command_error_counter += 1
    
    # Also check subcommands ACL categories
    for subcommand in command.subcommands:
        if not check_acl_categories(subcommand):
            check_command_error_counter += 1

if check_command_error_counter != 0:
    print("Error: There are errors in the commands check, please check the above logs.")
    exit(1)

commands_filename = "commands_with_reply_schema" if args.with_reply_schema else "commands"
print("Generating %s.def..." % commands_filename)
with open("%s/%s.def" % (srcdir, commands_filename), "w") as f:
    f.write("/* Automatically generated by %s, do not edit. */\n\n" % os.path.basename(__file__))
    f.write(
"""
/* We have fabulous commands from
 * the fantastic
 * Command Table! */

/* Must match serverCommandGroup */
const char *COMMAND_GROUP_STR[] = {
    "generic",
    "string",
    "list",
    "set",
    "sorted-set",
    "hash",
    "pubsub",
    "transactions",
    "connection",
    "server",
    "scripting",
    "hyperloglog",
    "cluster",
    "sentinel",
    "geo",
    "stream",
    "bitmap",
    "module"
};

const char *commandGroupStr(int index) {
    return COMMAND_GROUP_STR[index];
}
"""
    )

    command_list = sorted(commands.values(), key=lambda cmd: (cmd.group, cmd.name))
    for command in command_list:
        command.write_internal_structs(f)

    f.write("/* Main command table */\n")
    f.write("struct COMMAND_STRUCT serverCommandTable[] = {\n")
    curr_group = None
    for command in command_list:
        if curr_group != command.group:
            curr_group = command.group
            f.write("/* %s */\n" % curr_group)
        f.write("{%s},\n" % command.struct_code())
    f.write("{0}\n")
    f.write("};\n")

print("All done, exiting.")
