/*
 * par2serial-cc: Parallel-to-Serial Optimizing C Compiler
 * utils.h - Common utilities, memory management, error handling
 */
#ifndef P2S_UTILS_H
#define P2S_UTILS_H

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <assert.h>
#include <ctype.h>

/* ── Memory Arena ────────────────────────────────────────── */

#define ARENA_BLOCK_SIZE (64 * 1024) /* 64KB blocks */

typedef struct ArenaBlock {
    struct ArenaBlock *next;
    size_t             size;
    size_t             used;
    char               data[];
} ArenaBlock;

typedef struct Arena {
    ArenaBlock *head;
    ArenaBlock *current;
    size_t      total_alloc;
} Arena;

Arena *arena_create(void);
void  *arena_alloc(Arena *a, size_t size);
char  *arena_strdup(Arena *a, const char *s);
char  *arena_strndup(Arena *a, const char *s, size_t n);
void   arena_destroy(Arena *a);

/* ── Dynamic Array (type-safe via macros) ────────────────── */

#define VEC_INIT_CAP 8

#define VEC_TYPEDEF(T, Name) \
    typedef struct {         \
        T     *data;         \
        size_t len;          \
        size_t cap;          \
    } Name

#define vec_init(v)   do { (v)->data = NULL; (v)->len = 0; (v)->cap = 0; } while(0)

#define vec_push(v, item) do {                                          \
    if ((v)->len >= (v)->cap) {                                         \
        (v)->cap = (v)->cap ? (v)->cap * 2 : VEC_INIT_CAP;             \
        (v)->data = realloc((v)->data, (v)->cap * sizeof(*(v)->data));  \
        if (!(v)->data) { fprintf(stderr, "OOM\n"); exit(1); }         \
    }                                                                   \
    (v)->data[(v)->len++] = (item);                                     \
} while(0)

#define vec_free(v) do { free((v)->data); vec_init(v); } while(0)

/* ── String Buffer ───────────────────────────────────────── */

typedef struct StrBuf {
    char  *data;
    size_t len;
    size_t cap;
} StrBuf;

void strbuf_init(StrBuf *sb);
void strbuf_append(StrBuf *sb, const char *fmt, ...);
void strbuf_append_char(StrBuf *sb, char c);
void strbuf_append_indent(StrBuf *sb, int indent);
char *strbuf_detach(StrBuf *sb);
void strbuf_free(StrBuf *sb);

/* ── Error Reporting ─────────────────────────────────────── */

typedef struct SourceLoc {
    const char *filename;
    int         line;
    int         col;
} SourceLoc;

void p2s_error(SourceLoc loc, const char *fmt, ...);
void p2s_warn(SourceLoc loc, const char *fmt, ...);
void p2s_note(const char *fmt, ...);
void p2s_fatal(const char *fmt, ...);

/* ── Hash Map (string→void*) ─────────────────────────────── */

#define HASHMAP_INIT_CAP 64

typedef struct HashEntry {
    char              *key;
    void              *val;
    struct HashEntry  *next;
} HashEntry;

typedef struct HashMap {
    HashEntry **buckets;
    size_t      cap;
    size_t      len;
} HashMap;

HashMap *hashmap_create(void);
void     hashmap_put(HashMap *m, const char *key, void *val);
void    *hashmap_get(HashMap *m, const char *key);
bool     hashmap_has(HashMap *m, const char *key);
void     hashmap_destroy(HashMap *m);

/* ── Misc ────────────────────────────────────────────────── */

char *read_file(const char *path, size_t *out_len);

/* min/max */
#ifndef P2S_MIN
#define P2S_MIN(a, b) ((a) < (b) ? (a) : (b))
#define P2S_MAX(a, b) ((a) > (b) ? (a) : (b))
#endif

#endif /* P2S_UTILS_H */