/*
 * Copyright (C) 2024-2025 Carl Seifert
 * Copyright (C) 2024-2025 TU Dresden
 *
 * This file is subject to the terms and conditions of the GNU Lesser General
 * Public License v2.1. See the file LICENSE in the top level directory for
 * more details.
 */

/**
 * @file
 * @ingroup unittests
 * @brief   Unit tests for CoAP option accessors
 * @author  Carl Seifert <carl.seifert1@mailbox.tu-dresden.de>
 */

#include <stdio.h>

#include "tests-unicoap.h"

#include "net/unicoap/options.h"
#include <errno.h>

static const char poem[] = "CoAP"

                           "In a world of bytes, where data flows,"
                           "Across the air, where no wire grows,"
                           "In the quiet hum of devices small,"
                           "Where sensors blink and data calls,"
                           "CoAP rises, light and clear,"
                           "A simple voice that all can hear."

                           "Lightweight, swift, it makes the call,"
                           "Requesting data, large or small."
                           "It sends a GET, it sends a POST,"
                           "Across the networks, coast to coast."
                           "So here's to networks small and grand,"
                           "Where CoAP's whispers gently land.";
/* - ChatGPT */

static void assert_options_data(const unicoap_options_t* options)
{
    /* In this order:
     * Uri-Path: actuators
     * Uri-Path: leds
     * Content-Format: JSON
     * Uri-Query: color=g
     * Accept: JSON
     */
    uint8_t option_data[] = {
        0xb9, 0x61, 0x63, 0x74, 0x75, 0x61, 0x74, 0x6f, 0x72, 0x73, 0x04, 0x6c, 0x65, 0x64, 0x73,
        0x11, 0x32, 0x37, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x3d, 0x67, 0x21, 0x32
    };

    TEST_ASSERT_EQUAL_INT(options->option_count, 5);
    TEST_ASSERT_EQUAL_INT(unicoap_options_size(options), sizeof(option_data));
    _TEST_ASSERT_EQUAL_BYTES(unicoap_options_data(options), option_data, sizeof(option_data));
}

static void test_in_order(void)
{
    UNICOAP_OPTIONS_ALLOC_STATIC(options, 100);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_path_component_string(&options, "actuators"), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_path_component_string(&options, "leds"), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_content_format(&options, UNICOAP_FORMAT_JSON), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_query_string(&options, "color=g"), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_accept(&options, UNICOAP_FORMAT_JSON), 0);

    assert_options_data(&options);
}

static void test_out_of_order(void)
{
    UNICOAP_OPTIONS_ALLOC_STATIC(options, 100);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_accept(&options, UNICOAP_FORMAT_JSON), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_path_component_string(&options, "actuators"), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_query_string(&options, "color=g"), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_content_format(&options, UNICOAP_FORMAT_JSON), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_path_component_string(&options, "leds"), 0);

    assert_options_data(&options);
}

static void test_idempotent(void)
{
    UNICOAP_OPTIONS_ALLOC_STATIC(options, 100);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_accept(&options, UNICOAP_FORMAT_JSON), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_accept(&options, UNICOAP_FORMAT_JSON), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_path_component_string(&options, "actuators"), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_query_string(&options, "color=g"), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_content_format(&options, UNICOAP_FORMAT_JSON), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_content_format(&options, UNICOAP_FORMAT_TEXT), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set_content_format(&options, UNICOAP_FORMAT_JSON), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add_uri_path_component_string(&options, "leds"), 0);

    assert_options_data(&options);
}

static void _populate(unicoap_options_t* options)
{
    TEST_ASSERT_EQUAL_INT(unicoap_options_add(options, 50, (uint8_t*)poem, _UINT4_MAX + 1), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add(options, 12, (uint8_t*)poem, _UINT4_MAX), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add(options, 12, (uint8_t*)poem, _UINT4_MAX + 1), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add(options, 13, (uint8_t*)poem, _UINT4_MAX + 1), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set(options, 8, (uint8_t*)poem, _UINT12_MAX), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_add(options, 8, (uint8_t*)poem, _UINT12_MAX), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set(options, 10, (uint8_t*)poem, 200), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set(options, 2, (uint8_t*)poem, _UINT4_MAX + 1), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set(options, 70, (uint8_t*)poem, 1), 0);
    TEST_ASSERT_EQUAL_INT(unicoap_options_set(options, 1, (uint8_t*)poem, 1), 0);
}

static void test_extended_uint_shifts(void)
{
    UNICOAP_OPTIONS_ALLOC_STATIC(options, 900);
    _populate(&options);

    /* options blob, from nanoCoAP */
    static const uint8_t options_blob[] = {
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    };

    TEST_ASSERT_EQUAL_INT(sizeof(options_blob), unicoap_options_size(&options));
    _TEST_ASSERT_EQUAL_BYTES(options_blob, unicoap_options_data(&options), sizeof(options_blob));
}

static void test_remove_leading(void)
{
    UNICOAP_OPTIONS_ALLOC_STATIC(options, 900);
    _populate(&options);

    TEST_ASSERT_EQUAL_INT(unicoap_options_remove(&options, 1), 0);

    /* options blob, from nanoCoAP */
    static const uint8_t options_blob[] = {
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        0x61, 0x20, 0x77, 0x6F, 0x72, 0x0D, 0x00, 0x43, 0x6F, 0x41, 0x50, 0x49, 0x6E, 0x20, 0x61,
        0x20, 0x77, 0x6F, 0x72, 0x6C, 0x1D, 0x00, 0x43, 0x6F, 0x41, 0x50, 0x49, 0x6E, 0x20, 0x61,
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        0x61, 0x20, 0x77, 0x6F, 0x72, 0x6C, 0xD1, 0x07, 0x43
    };

    TEST_ASSERT_EQUAL_INT(sizeof(options_blob), unicoap_options_size(&options));
    _TEST_ASSERT_EQUAL_BYTES(options_blob, unicoap_options_data(&options), sizeof(options_blob));
}

static void test_remove_trailing(void)
{
    UNICOAP_OPTIONS_ALLOC_STATIC(options, 900);
    _populate(&options);

    TEST_ASSERT_EQUAL_INT(unicoap_options_remove(&options, 70), 0);

    /* options blob, from nanoCoAP */
    static const uint8_t options_blob[] = {
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    };

    TEST_ASSERT_EQUAL_INT(sizeof(options_blob), unicoap_options_size(&options));
    _TEST_ASSERT_EQUAL_BYTES(options_blob, unicoap_options_data(&options), sizeof(options_blob));
}

static void test_remove_multiple(void)
{
    UNICOAP_OPTIONS_ALLOC_STATIC(options, 900);
    _populate(&options);

    TEST_ASSERT_EQUAL_INT(unicoap_options_remove(&options, 12), 0);

    /* options blob, from nanoCoAP */
    static const uint8_t options_blob[] = {
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    };

    TEST_ASSERT_EQUAL_INT(sizeof(options_blob), unicoap_options_size(&options));
    _TEST_ASSERT_EQUAL_BYTES(options_blob, unicoap_options_data(&options), sizeof(options_blob));
}

Test* tests_unicoap_options(void)
{
    EMB_UNIT_TESTFIXTURES(fixtures){
        new_TestFixture(test_in_order),
        new_TestFixture(test_out_of_order),
        new_TestFixture(test_idempotent),
        new_TestFixture(test_extended_uint_shifts),
        new_TestFixture(test_remove_leading),
        new_TestFixture(test_remove_trailing),
        new_TestFixture(test_remove_multiple),
    };

    EMB_UNIT_TESTCALLER(test_unicoap, NULL, NULL, fixtures);

    return (Test*)&test_unicoap;
}