#ifndef __SCC_CFG_H__
#define __SCC_CFG_H__

#include <scc_core.h>
#include <scc_hashtable.h>

#define SCC_CFG_ID_nullptr (0)
typedef usize scc_cfg_id_t;
typedef scc_cfg_id_t scc_cfg_bblock_id_t;
typedef scc_cfg_id_t scc_cfg_func_id_t;
typedef scc_cfg_id_t scc_cfg_symbol_id_t;

typedef SCC_VEC(scc_cfg_bblock_id_t) scc_cfg_bblock_id_vec_t;
typedef SCC_VEC(void *) scc_cfg_value_vec_t;
typedef struct scc_cfg_module scc_cfg_module_t;
typedef struct scc_cfg_func scc_cfg_func_t;
typedef struct scc_cfg_bblock scc_cfg_bblock_t;
typedef struct scc_cfg_symbol scc_cfg_symbol_t;

struct scc_cfg_bblock {
    scc_cfg_bblock_id_t id;
    const char *name;
    scc_cfg_bblock_id_vec_t preds; // 前驱
    scc_cfg_bblock_id_vec_t succs; // 后继
    scc_cfg_value_vec_t values;    // using cast
    void *meta;
};

struct scc_cfg_func {
    const char *name;

    scc_cfg_bblock_id_t next_bblock_id;
    scc_cfg_bblock_id_vec_t bblocks;
    scc_hashtable_t bblock_map; // id -> index

    scc_cfg_bblock_id_t entry_bblock_id; // maybe it will always 0
    void *meta;
};

typedef enum {
    SCC_CFG_SYMBOL_KIND_FUNC,
    SCC_CFG_SYMBOL_KIND_DATA,
    SCC_CFG_SYMBOL_KIND_EXTERN,
} scc_cfg_symbol_kind_t;

typedef enum {
    SCC_CFG_SYMBOL_LINK_GLOABL,
    SCC_CFG_SYMBOL_LINK_LOCAL,
} scc_cfg_symbol_linkage_t;

struct scc_cfg_symbol {
    const char *name;
    scc_cfg_symbol_kind_t kind;
    scc_cfg_symbol_linkage_t linkage;
    void *meta;
};

typedef SCC_VEC(scc_cfg_bblock_t) scc_cfg_bblock_vec_t;
typedef SCC_VEC(scc_cfg_func_t) scc_cfg_func_vec_t;
typedef SCC_VEC(scc_cfg_symbol_t) scc_cfg_symbol_vec_t;
struct scc_cfg_module {
    scc_cfg_bblock_vec_t bblocks;
    scc_cfg_func_vec_t funcs;     /* 所有函数定义（按添加顺序） */
    scc_cfg_symbol_vec_t symbols; /* 全局符号表 */
    scc_hashtable_t symbol_map;   /* 名称 -> 索引 */
};

void scc_cfg_module_init(scc_cfg_module_t *module);
/**
 * @brief
 *
 * @param module
 * @warning 由于void*存在可能导致严重内存泄漏
 */
void scc_cfg_module_drop(scc_cfg_module_t *module);
scc_cfg_func_id_t scc_cfg_module_add_func(scc_cfg_module_t *module,
                                          const scc_cfg_func_t *func);
scc_cfg_func_t *scc_cfg_module_unsafe_get_func(scc_cfg_module_t *module,
                                               scc_cfg_func_id_t id);
scc_cfg_bblock_id_t scc_cfg_module_add_bblock(scc_cfg_module_t *module,
                                              const scc_cfg_bblock_t *bblock);
scc_cfg_bblock_t *scc_cfg_module_unsafe_get_bblock(scc_cfg_module_t *module,
                                                   scc_cfg_bblock_id_t id);
scc_cfg_symbol_id_t scc_cfg_module_add_symbol(scc_cfg_module_t *module,
                                              const scc_cfg_symbol_t *symbol);
scc_cfg_symbol_t *scc_cfg_module_unsafe_get_symbol(scc_cfg_module_t *module,
                                                   scc_cfg_symbol_id_t id);
scc_cfg_symbol_id_t scc_cfg_module_lookup_symbol(const scc_cfg_module_t *module,
                                                 const char *name);

static inline const scc_cfg_symbol_t *
scc_cfg_module_unsafe_lookup_symbol(const scc_cfg_module_t *module,
                                    const char *name) {
    scc_cfg_id_t idx = scc_cfg_module_lookup_symbol(module, name);
    if (idx == 0) {
        Panic("Can't find symbol %s", name);
        return nullptr;
    }
    return &scc_vec_at(module->symbols, idx);
}

// scc_cfg_bblock_id_t scc_cfg_func_add_bblock(scc_cfg_func_t *func,
//                                             const scc_cfg_bblock_t *bblock);
// scc_cfg_bblock_t *scc_cfg_func_unsafe_get_bblock(scc_cfg_func_t *func,
//                                                  scc_cfg_bblock_id_t id);
// scc_cfg_bblock_t *scc_cfg_func_unsafe_entry_bblock(scc_cfg_func_t *func);

void scc_cfg_bblock_add_pred(scc_cfg_bblock_t *bb, scc_cfg_bblock_id_t pred_id);
void scc_cfg_bblock_remove_pred(scc_cfg_bblock_t *bb,
                                scc_cfg_bblock_id_t pred_id);
void scc_cfg_bblock_clear_pred(scc_cfg_bblock_t *bb);
void scc_cfg_bblock_add_succ(scc_cfg_bblock_t *bb, scc_cfg_bblock_id_t succ_id);
void scc_cfg_bblock_remove_succ(scc_cfg_bblock_t *bb,
                                scc_cfg_bblock_id_t succ_id);
void scc_cfg_bblock_clear_succs(scc_cfg_bblock_t *bb);

#endif /* __SCC_CFG_H__ */