#include "arena_alloc.h"
#include "context.h"
#include "interp.h"
#include "strbuf.h"
#include <arena.h>
#include <debugconsole.h>
#include <filereader.h>
#include <in_gb.h>
#include <in_input.h>
#include <malloc.h>
#include <minmax.h>
#include <mprintf.h>
#include <path.h>
#include <printf.h>
#include <process.h>
#include <status.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <system.h>

#define PROMPT "$ "

void* wmalloc (void* ctx, size_t size) {
  (void)ctx;
  return malloc (size);
}

void* wrealloc (void* ctx, void* mem, size_t old, size_t new) {
  (void)ctx, (void)old;
  return realloc (mem, new);
}

void wfree (void* ctx, void* mem) {
  (void)ctx;
  free (mem);
}

void* warena_malloc (void* ctx, size_t size) {
  struct arena* a = ctx;
  return arena_malloc (a, size);
}

void* warena_realloc (void* ctx, void* mem, size_t old, size_t new) {
  struct arena* a = ctx;
  return arena_realloc (a, mem, old, new);
}

void warena_free (void* ctx, void* mem) { (void)ctx, (void)mem; }

struct edit_line {
  struct in_gb gb;
  size_t cursor;
};

static void exec_line (const char* line) {
  struct list_node_link* tokens = NULL;

  tokenize (&tokens, line);

  if (tokens != NULL)
    parse_and_execute (tokens);
}

static bool split_lines_cb (void* ctx, const char* start, size_t len) {
  (void)ctx;

  char* line = malloc (len + 1);
  memcpy (line, start, len);
  line[len] = '\0';

  if (line[0] != '\0')
    exec_line (line);

  free (line);

  return true;
}

static bool split_args_cb (void* ctx, const char* start, size_t len) {
  (void)ctx;

  if (posvar_count >= POSVAR_MAX)
    return false;

  struct posvar* posvar = &posvars[posvar_count++];
  memset (posvar, 0, sizeof (*posvar));

  memcpy (posvar->buf, start, min (len, sizeof (posvar->buf) - 1));

  return true;
}

void app_main (void) {
  char scriptpathbuf[PATH_MAX];
  char posvarsbuf[2048];
  char line[1024];

  memset (scriptpathbuf, 0, sizeof (scriptpathbuf));
  int has_script = env_get (process_get_pgid (), "s", (void*)scriptpathbuf, sizeof (scriptpathbuf));

  if (has_script == ST_OK) {
    interactive_mode = false;

    if (env_get (process_get_pgid (), "args", (void*)posvarsbuf, sizeof (posvarsbuf)) == ST_OK) {
      strtokenize (posvarsbuf, ' ', NULL, &split_args_cb);
    }

    char volume[VOLUME_MAX];
    const char* path;
    int ret;

    if (!path_parse (scriptpathbuf, volume, &path)) {
      mprintf ("ERROR bad path '%s'\n", scriptpathbuf);
      return;
    }

    struct filereader fr;
    if ((ret = filereader_init (&fr, volume, path)) < 0) {
      mprintf ("ERROR could not initialize filereader for '%s:%s'\n", volume, path);
      return;
    }

    char* buffer = malloc (fr.file_size + 1);
    memset (buffer, 0, fr.file_size + 1);

    if ((ret = filereader_read (&fr, (uint8_t*)buffer, fr.file_size)) < 0) {
      mprintf ("ERROR could not read script: '%s:%s'\n", volume, path);
      free (buffer);
      filereader_fini (&fr);
      return;
    }

    str_split_lines (buffer, strlen (buffer), NULL, &split_lines_cb);

    free (buffer);
  } else {
    interactive_mode = true;

    while (interp_is_running ()) {
      memset (line, 0, sizeof (line));

      in_stream_read_line (PROMPT, line, sizeof (line) - 1);

      if (line[0] != '\0')
        exec_line (line);
    }
  }
}