import stdio
import t, c
import string


# ============================================================
# string_test - string.py 库函数测试
#
# 测试 strlen / strcmp / strncmp / atoi / strchr / strstr
# ============================================================


def test_strlen():
    stdio.printf("--- Test 1: strlen ---\n")

    l1: t.CSizeT = string.strlen("Hello")
    stdio.printf("strlen(Hello)=%lu (expect 5)\n", l1)

    l2: t.CSizeT = string.strlen("")
    stdio.printf("strlen()=%lu (expect 0)\n", l2)

    l3: t.CSizeT = string.strlen("Hello, World!")
    stdio.printf("strlen(Hello, World!)=%lu (expect 13)\n", l3)


def test_strcmp():
    stdio.printf("--- Test 2: strcmp ---\n")

    r1: t.CInt = string.strcmp("abc", "abc")
    stdio.printf("strcmp(abc,abc)=%d (expect 0)\n", r1)

    r2: t.CInt = string.strcmp("abc", "abd")
    stdio.printf("strcmp(abc,abd)=%d (expect <0)\n", r2)

    r3: t.CInt = string.strcmp("abd", "abc")
    stdio.printf("strcmp(abd,abc)=%d (expect >0)\n", r3)


def test_strncmp():
    stdio.printf("--- Test 3: strncmp ---\n")

    r1: t.CInt = string.strncmp("abcdef", "abcXYZ", 3)
    stdio.printf("strncmp(abcdef,abcXYZ,3)=%d (expect 0)\n", r1)

    r2: t.CInt = string.strncmp("abcdef", "abcXYZ", 4)
    stdio.printf("strncmp(abcdef,abcXYZ,4)=%d (expect <0)\n", r2)


def test_atoi():
    stdio.printf("--- Test 4: atoi ---\n")

    n1: t.CInt = string.atoi("123")
    stdio.printf("atoi(123)=%d (expect 123)\n", n1)

    n2: t.CInt = string.atoi("-456")
    stdio.printf("atoi(-456)=%d (expect -456)\n", n2)

    n3: t.CInt = string.atoi("  789")
    stdio.printf("atoi(  789)=%d (expect 789)\n", n3)


def test_strchr():
    stdio.printf("--- Test 5: strchr ---\n")

    # strchr 返回指向字符的指针，不为 None 表示找到
    p: str = string.strchr("Hello", 108)  # 'l' = 108
    if p is not None:
        stdio.printf("strchr(Hello,'l') found, char=%d (expect 108)\n", c.Deref(p))
    else:
        stdio.printf("strchr(Hello,'l') NOT FOUND (FAIL)\n")

    p2: str = string.strchr("Hello", 122)  # 'z' = 122
    if p2 is None:
        stdio.printf("strchr(Hello,'z') not found OK\n")
    else:
        stdio.printf("strchr(Hello,'z') FAIL (should be None)\n")


def test_strstr():
    stdio.printf("--- Test 6: strstr ---\n")

    p: str = string.strstr("Hello World", "World")
    if p is not None:
        stdio.printf("strstr(Hello,World) found OK\n")
    else:
        stdio.printf("strstr(Hello,World) NOT FOUND (FAIL)\n")

    p2: str = string.strstr("Hello World", "xyz")
    if p2 is None:
        stdio.printf("strstr(Hello,xyz) not found OK\n")
    else:
        stdio.printf("strstr(Hello,xyz) FAIL (should be None)\n")


def string_test() -> int:
    stdio.printf("=== string_test: string.py 库函数测试 ===\n\n")

    test_strlen()
    test_strcmp()
    test_strncmp()
    test_atoi()
    test_strchr()
    test_strstr()

    stdio.printf("\n=== string_test 完成 ===\n")
    return 0