#!/usr/bin/env python3
"""
SystemK settings code generator.

This program source code file is part of SystemK, a library in the KTag project.

🛡️ https://ktag.clubk.club

Copyright © 2025 Joseph P. Kearney and the KTag developers.

This program is free software: you can redistribute it and/or modify it under
the terms of the GNU Affero General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option) any
later version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
details.

A copy of the GNU Affero General Public License should be available in the
LICENSE file in the root of this repository. If not, see http://www.gnu.org/licenses/.
"""

import csv
from typing import List, Dict


def parse_csv(filename: str) -> List[Dict[str, str]]:
    """Parse the settings CSV file."""
    settings = []
    with open(filename, "r") as f:
        reader = csv.DictReader(f)
        for row in reader:
            settings.append(row)
    return settings


def generate_get_function(settings: List[Dict[str, str]], datatype: str) -> str:
    """Generate the SETTINGS_get function for a specific datatype."""
    func_name = f"SETTINGS_get_{datatype}"

    code = f"""SystemKResult_T {func_name}(SystemKSettingID_T id, {datatype} *value)
{{
    SystemKResult_T result = SYSTEMK_RESULT_UNSPECIFIED_FAILURE;

    switch (id)
    {{
"""

    for setting in settings:
        if setting["Type"] != datatype:
            continue

        setting_id = setting["Setting ID"]
        key = setting["Key"]
        cache_var = f"Cached_{key}"

        code += f"""    case {setting_id}:
        *value = {cache_var};
        result = SYSTEMK_RESULT_SUCCESS;
        break;

"""

    code += """    default:
        result = SYSTEMK_RESULT_WRONG_DATATYPE;
        break;
    }

    return result;
}
"""
    return code


def generate_set_function(settings: List[Dict[str, str]], datatype: str) -> str:
    """Generate the SETTINGS_set function for a specific datatype."""
    func_name = f"SETTINGS_set_{datatype}"
    kv_func = f"KV_Set_Value_{datatype.replace('_t', '')}"

    code = f"""SystemKResult_T {func_name}(SystemKSettingID_T id, {datatype} value)
{{
    SystemKResult_T result = SYSTEMK_RESULT_SUCCESS;

    switch (id)
    {{
"""

    for setting in settings:
        if setting["Type"] != datatype:
            continue

        setting_id = setting["Setting ID"]
        key = setting["Key"]

        cache_var = f"Cached_{key}"
        code += f"""    case {setting_id}:
        {cache_var} = value;
        result = {kv_func}(CONFIG_FILE, "{key}", &value);
        break;

"""

    code += """    default:
        result = SYSTEMK_RESULT_WRONG_DATATYPE;
        break;
    }

    return result;
}
"""
    return code


def generate_initialize_function(settings: List[Dict[str, str]]) -> str:
    """Generate the Initialize_Settings function."""
    code = """SystemKResult_T Initialize_Settings(void)
{
    SystemKResult_T result = SYSTEMK_RESULT_SUCCESS;
    SystemKResult_T temp_result;
"""

    # Group settings by datatype.
    datatypes = set(s["Type"] for s in settings)

    for datatype in sorted(datatypes):
        code += f"    {datatype} value_{datatype};\n"

    code += """
    KLOG_INFO(TAG, "Initializing settings...");

"""

    # Generate initialization code for each setting.
    for setting in settings:
        setting_id = setting["Setting ID"]
        datatype = setting["Type"]
        key = setting["Key"]
        default_value = setting["Default Value"]

        code += f"""    // Initialize {key}
    temp_result = KV_Get_Value_{datatype.replace('_t', '')}(CONFIG_FILE, "{key}", &value_{datatype});
    if (temp_result != SYSTEMK_RESULT_SUCCESS)
    {{
        // Try to get from default config
        temp_result = KV_Get_Value_{datatype.replace('_t', '')}(DEFAULT_CONFIG_FILE, "{key}", &value_{datatype});
        if (temp_result != SYSTEMK_RESULT_SUCCESS)
        {{
            // Use hardcoded default
            value_{datatype} = {default_value};
            KLOG_WARN(TAG, "{key} not found in config files; using default value of {default_value}.");
        }}
        // Save to config file
        temp_result = KV_Set_Value_{datatype.replace('_t', '')}(CONFIG_FILE, "{key}", &value_{datatype});
        if (temp_result != SYSTEMK_RESULT_SUCCESS)
        {{
            result = temp_result;
            KLOG_ERROR(TAG, "Failed to set {key} in config file.");
        }}
    }}
"""

        # Initialize the cache variable
        cache_var = f"Cached_{key}"
        code += f"    {cache_var} = value_{datatype};\n"

        code += "\n"

    code += """    xEventGroupSetBits(Get_System_Events(), SYS_SETTINGS_READY);
    KLOG_INFO(TAG, "Settings initialized.");

    return result;
}
"""
    return code


def generate_cache_declarations(settings: List[Dict[str, str]]) -> str:
    """Generate static cache variable declarations initialized to defaults."""
    code = ""

    # Generate cache variable declarations for all settings
    for setting in settings:
        datatype = setting["Type"]
        key = setting["Key"]
        description = setting["Description"]
        default_value = setting["Default Value"]
        cache_var = f"Cached_{key}"

        code += f"// {description}\n"
        code += f"static {datatype} {cache_var} = {default_value};\n"

    return code


def main():
    """Main function to generate all settings code."""
    settings = parse_csv("Settings.csv")

    # Get unique datatypes
    datatypes = sorted(set(s["Type"] for s in settings))

    print("// Cache variable declarations")
    print(generate_cache_declarations(settings))
    print()

    # Generate get and set functions for each datatype
    for datatype in datatypes:
        print(generate_get_function(settings, datatype))
        print()
        print(generate_set_function(settings, datatype))
        print()

    # Generate initialize function
    print(generate_initialize_function(settings))


if __name__ == "__main__":
    main()