#include "arena_alloc.h"
#include "context.h"
#include "interp.h"
#include "strbuf.h"
#include <arena.h>
#include <cmdline_parser.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 "$ "

static bool cmdline_printcmds = false;
static char cmdline_script[CMDLINE_OPT_VALUE_MAX];
static char cmdline_posvars[CMDLINE_OPT_VALUE_MAX];

static struct cmdline_opt cmdline_opts[] = {
    CMDLINE_OPT("p", "printcmds", CMDLINE_OPT_VALUE_BOOL, false, &cmdline_printcmds),
    CMDLINE_OPT("s", "script", CMDLINE_OPT_VALUE_STRING, false, (char*)cmdline_script),
    CMDLINE_OPT("a", "args", CMDLINE_OPT_VALUE_STRING, false, (char*)cmdline_posvars),
    CMDLINE_END(),
};

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;

  if (cmdline_printcmds)
    mprintf("+%s\n", line);

  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) {
  if (cmdline_parse(get_cmdline(), cmdline_opts) < 0) {
    mprintf("Failed to parse commandline arguments\n");
    return;
  }

  char line[1024];

  if (strlen(cmdline_script) > 0) {
    if (strlen(cmdline_posvars) > 0)
      strtokenize(cmdline_posvars, ' ', NULL, &split_args_cb);

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

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