#include <c_Array.h>

c_err_t c_Array_Init(c_Array_t* self, c_size_t item_size, c_size_t size, c_Allocator_t* allocator) {
    if (!self || item_size == 0 || size == 0) return C_ERR_PARAM;

    // 内部绑定：如果传入 NULL，无缝降级为系统默认分配器
    self->allocator = (allocator != NULL) ? *allocator : c_DefaultAllocator;
    self->item_size = item_size;
    self->size = size;

    // 通过内部绑定的分配器，一次性开辟完全密集且等长的字节存储空间
    self->array = c_Allocator_Alloc(&self->allocator, self->size * self->item_size);
    if (!self->array) return C_ERR_NOMEM;

    // 默认执行干净抹零
    memset(self->array, 0, self->size * self->item_size);
    return C_ERR_OK;
}

// 销毁固定数组资源
void c_Array_Destroy(c_Array_t* self) {
    if (!self) return;
    if (self->array) {
        c_Allocator_Free(&self->allocator, self->array);
        self->array = NULL;
    }
    self->size = 0;
}

// 定点安全写入 (深度值复制)
c_err_t c_Array_Write(c_Array_t* self, c_size_t index, const void* item) {
    // 强御级边界防御：拦截一切非法越界或空域写入
    if (!self || !item || index >= self->size) return C_ERR_PARAM;

    // 计算精准的物理坑位物理地址并执行覆写
    char* target = (char*)self->array + (index * self->item_size);
    memcpy(target, item, self->item_size);

    return C_ERR_OK;
}

// 定点安全读取 (安全拷出副本)
c_err_t c_Array_Read(const c_Array_t* self, c_size_t index, void* out_item) {
    if (!self || !out_item || index >= self->size) return C_ERR_PARAM;

    const char* source = (const char*)self->array + (index * self->item_size);
    memcpy(out_item, source, self->item_size);

    return C_ERR_OK;
}

// 只读原位窥探指针 (注意：因为大小固定，该指针在数组生命周期内绝对不可变、不跑飞，极度安全)
void* c_Array_Get(const c_Array_t* self, c_size_t index) {
    if (!self || index >= self->size) return NULL;
    return (char*)self->array + (index * self->item_size);
}

// 全局高速批量刷值填充 (常用于初始化状态、重置音频轨等)
c_err_t c_Array_Fill(c_Array_t* self, const void* item) {
    if (!self || !item) return C_ERR_PARAM;

    // 利用连续线性空间的特点，高速循环平铺拷贝
    char* target = (char*)self->array;
    for (c_size_t i = 0; i < self->size; i++) {
        memcpy(target, item, self->item_size);
        target += self->item_size;
    }

    return C_ERR_OK;
}