#ifndef __SCC_IR_DEF_H__
#define __SCC_IR_DEF_H__

#include <scc_core.h>

#define SCC_IR_REF_NULL 0

typedef unsigned int ir_handle_t;
typedef const char *scc_ir_label_t;

typedef SCC_VEC(u8) scc_ir_buffer_t;

typedef struct scc_ir_value scc_ir_value_t;
typedef ir_handle_t scc_ir_value_ref_t;
typedef SCC_VEC(scc_ir_value_ref_t) scc_ir_node_ref_vec_t;

typedef struct scc_ir_type scc_ir_type_t;
typedef ir_handle_t scc_ir_type_ref_t;
typedef SCC_VEC(scc_ir_type_ref_t) scc_ir_type_ref_vec_t;

typedef struct scc_ir_bblock scc_ir_bblock_t;
typedef ir_handle_t scc_ir_bblock_ref_t;
typedef SCC_VEC(scc_ir_bblock_ref_t) scc_ir_bblock_ref_vec_t;

typedef struct scc_ir_func scc_ir_func_t;
typedef ir_handle_t scc_ir_func_ref_t;
typedef SCC_VEC(scc_ir_func_ref_t) scc_ir_func_ref_vec_t;

typedef enum scc_ir_type_tag {
    SCC_IR_TYPE_unknown,
    SCC_IR_TYPE_void,
    SCC_IR_TYPE_i8,
    SCC_IR_TYPE_i16,
    SCC_IR_TYPE_i32,
    SCC_IR_TYPE_i64,
    SCC_IR_TYPE_i128,
    SCC_IR_TYPE_u8,
    SCC_IR_TYPE_u16,
    SCC_IR_TYPE_u32,
    SCC_IR_TYPE_u64,
    SCC_IR_TYPE_u128,
    SCC_IR_TYPE_f16,
    SCC_IR_TYPE_f32,
    SCC_IR_TYPE_f64,
    SCC_IR_TYPE_f128,
    SCC_IR_TYPE_PTR,
    SCC_IR_TYPE_ARRAY,
    SCC_IR_TYPE_FUNC,
    SCC_IR_TYPE_STRUCT,
    SCC_IR_TYPE_UNION,
    SCC_IR_TYPE_VECTOR, // TODO SIMD
} scc_ir_type_tag_t;

struct scc_ir_type {
    scc_ir_type_tag_t tag;
    const char *name; // For Debug
    union {
        struct {
            scc_ir_type_ref_t base;
            usize len; // TODO usize is target dependent
        } array;
        struct {
            scc_ir_type_ref_t base;
        } pointer;
        struct {
            scc_ir_type_ref_vec_t elements;
        } aggregate;
        struct {
            scc_ir_type_ref_vec_t params;
            scc_ir_type_ref_t ret_type;
        } function;
    } data;
};

struct scc_ir_bblock {
    scc_ir_label_t label;
    scc_ir_node_ref_vec_t instrs;
    // ir_arr_t used_by;
}; // basic block

struct scc_ir_func {
    scc_ir_label_t name;
    scc_ir_type_ref_t type;
    scc_ir_node_ref_vec_t params;
    scc_ir_bblock_ref_vec_t bblocks;
};

typedef enum scc_ir_value_tag {
    SCC_IR_VALUE_TAG_NULL,
    SCC_IR_VALUE_TAG_CONST_INT,
    SCC_IR_VALUE_TAG_CONST_UINT,
    SCC_IR_VALUE_TAG_CONST_FLOAT,
    SCC_IR_VALUE_TAG_CONST_ARRAY,
    SCC_IR_VALUE_TAG_AGGREGATE,     ///< 聚合值
    SCC_IR_VALUE_TAG_CONV,          ///< 类型转换
    SCC_IR_VALUE_TAG_FUNC_ARG_REF,  ///< 函数参数引用
    SCC_IR_VALUE_TAG_BLOCK_ARG_REF, ///< 基本块参数引用
    SCC_IR_VALUE_TAG_ALLOC,         ///< 分配内存
    SCC_IR_VALUE_TAG_GLOBAL_ALLOC,  ///< 全局分配
    SCC_IR_VALUE_TAG_LOAD,          ///< 加载数据
    SCC_IR_VALUE_TAG_STORE,         ///< 存储数据
    SCC_IR_VALUE_TAG_GET_PTR,       ///< 获取指针
    SCC_IR_VALUE_TAG_GET_ELEM_PTR,  ///< 获取元素指针
    SCC_IR_VALUE_TAG_OP,            ///< 二元运算
    SCC_IR_VALUE_TAG_BRANCH,        ///< 有条件分支
    SCC_IR_VALUE_TAG_JUMP,          ///< 无条件跳转
    SCC_IR_VALUE_TAG_CALL,          ///< 调用函数
    SCC_IR_VALUE_TAG_RET,           ///< 函数返回
} scc_ir_value_tag_t;

typedef enum {
    /// Empty op for init or nop
    SCC_IR_OP_EMPTY,
    /// Not equal to.
    SCC_IR_OP_NEQ,
    /// Equal to.
    SCC_IR_OP_EQ,
    /// Greater than.
    SCC_IR_OP_GT,
    /// Less than.
    SCC_IR_OP_LT,
    /// Greater than or equal to.
    SCC_IR_OP_GE,
    /// Less than or equal to.
    SCC_IR_OP_LE,
    /// Addition.
    SCC_IR_OP_ADD,
    /// Subtraction.
    SCC_IR_OP_SUB,
    /// Multiplication.
    SCC_IR_OP_MUL,
    /// Division.
    SCC_IR_OP_DIV,
    /// Modulo.
    SCC_IR_OP_MOD,
    /// Bitwise AND.
    SCC_IR_OP_AND,
    /// Bitwise OR.
    SCC_IR_OP_OR,
    /// Bitwise XOR.
    SCC_IR_OP_XOR,
    /// Bitwise NOT.
    SCC_IR_OP_NOT,
    /// Shift left logical.
    SCC_IR_OP_SHL,
    /// Shift right logical.
    SCC_IR_OP_SHR,
    /// Shift right arithmetic.
    SCC_IR_OP_SAR,
} scc_ir_op_type_t;

typedef union {
    i8 int8;
    i16 int16;
    i32 int32;
    i64 int64;
    // TODO int128
    i8 int_any[16];
} scc_ir_const_int_t;

typedef union {
    u8 uint8;
    u16 uint16;
    u32 uint32;
    u64 uint64;
    // TODO uint128;
    u8 uint_any[16];
} scc_ir_const_uint_t;

typedef union {
    // f16 float16;
    f32 float32;
    f64 float64;
    // TODO float128;
    u8 float_any[16];
} scc_ir_const_float_t;

struct scc_ir_value {
    scc_ir_type_ref_t type;
    scc_ir_label_t name;
    scc_ir_node_ref_vec_t used_by;
    scc_ir_value_tag_t tag;
    union {
        scc_ir_const_int_t const_int;
        scc_ir_const_uint_t const_uint;
        scc_ir_const_float_t const_float;
        struct {
            scc_ir_value_ref_t base_type;
            scc_ir_buffer_t elements;
        } const_array;
        struct {
            scc_ir_node_ref_vec_t elements;
        } aggregate;
        struct {
            usize idx;
        } arg_ref;
        struct {
            scc_ir_value_ref_t value;
        } global_alloc;
        struct {
            scc_ir_value_ref_t operand;
            scc_ir_type_ref_t target_type; // 目标类型
            enum { CONV_SEXT, CONV_ZEXT, CONV_TRUNC } conv_type;
        } conv;
        struct {
            scc_ir_value_ref_t target;
        } load;
        struct {
            scc_ir_value_ref_t target;
            scc_ir_value_ref_t value;
        } store;
        struct {
            scc_ir_value_ref_t src_addr;
            scc_ir_value_ref_t index;
        } get_ptr;
        struct {
            scc_ir_value_ref_t src_addr;
            scc_ir_value_ref_t index;
        } get_elem_ptr;
        struct {
            scc_ir_op_type_t op;
            scc_ir_value_ref_t lhs;
            scc_ir_value_ref_t rhs;
        } op;
        struct {
            scc_ir_value_ref_t cond;
            scc_ir_bblock_ref_t true_bblock;
            scc_ir_bblock_ref_t false_bblock;
        } branch;
        struct {
            scc_ir_bblock_ref_t target_bblock;
        } jump;
        struct {
            scc_ir_func_ref_t callee; // TODO function pointer call
            scc_ir_node_ref_vec_t args;
        } call;
        struct {
            scc_ir_value_ref_t ret_val;
        } ret;
    } data;
};

#endif /* __SCC_IR_DEF_H__ */