#include <bsd/string.h>
#include <limits.h>
#include <log.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "types.h"

#include "args.h"
#include "config.h"
#include "string.h"

static void print_help(int status_code) {
  puts(
      PACKAGE
      " " VERSION "\n\n"
      "usage: " PACKAGE " "
      "[-h] "
      "[-v] "
      "[-p=PROJECT_PATH] "
      "[-c=CFG_FILE] "
      "[-hr] "
      "[-s=SCREEN] "
      "[-m=SCREEN] "
      "[-mo] "
      "[-w] "
      "[-t=TEMPO] "
      "[-d] "
      "[-ar / -nar] "
      "[-arc=CYCLES] "
#ifdef VIDEO_IN
      "[-vi=FILE] "
      "[-vs=SIZE] "
#endif /* VIDEO_IN */
      "[-is=SIZE] "
      "[-ls / -nls] "
      "[-ss / -nss] "
      "[-tm] "
      "[-tf] "
      "\n\n"
      "Fusion Of Real-time Generative Effects.\n\n"
      "options:\n"
      "  -h, --help                  show this help message and exit\n"
      "  -v, --version               print version\n"
      "  -p, --project               forge project directory (default: " DATADIR
      "/default)\n"
      "  -c, --config                config file name (default: "
      "forge_project.cfg)\n"
      "  -hr, --hot-reload           hot reload of shaders scripts\n"
      "  -s, --screen                output screen number (default: primary)\n"
      "  -m, --monitor               monitor screen number (default: none)\n"
      "  -mo, --monitor-only         no output screen\n"
      "  -w, --windowed              not fullscreen\n"
      "  -t, --tempo                 base tempo (default: 60)\n"
      "  -d, --demo                  demonstration mode (assume "
      "--no-save-state, --no-load-state, --auto-random)\n"
      "  -ar, --auto-random          randomize state every cycle (4 beats)\n"
      "  -nar, --no-auto-random      do not randomize state (default)\n"
      "  -arc, --auto-random-cycle   auto random cycle length (default: 4)\n"
#ifdef VIDEO_IN
      "  -vi, --video-in             path to video capture device (multiple "
      "allowed)\n"
      "  -vs, --video-size           video capture desired height (default: "
      "internal texture height)\n"
#endif /* VIDEO_IN */
      "  -is, --internal-size        internal texture height (default: 720)\n"
      "  -ls, --load-state           load saved state (default)\n"
      "  -nls, --no-load-state       do not load saved state\n"
      "  -ss, --save-state           save state (default)\n"
      "  -nss, --no-save-state       do not save state\n"
      "  -tm, --trace-midi           print midi code and values\n"
      "  -tf, --trace-fps            print fps status of subsystems\n");
  exit(status_code);
}

static void invalid_arg(const char *arg) {
  log_error("invalid argument: '%s'", arg);
  print_help(EXIT_FAILURE);
}

static void invalid_value(const char *arg, const char *value) {
  log_error("invalid value for argument '%s': '%s'", arg, value);
  print_help(EXIT_FAILURE);
}

static bool is_arg(const char *arg, const char *ref) {
  return strcoll(arg, ref) == 0;
}

static const char *split_arg_value(char *arg) {
  char *rest;

  strtok_r(arg, "=", &rest);

  return rest;
}

static unsigned int parse_uint(const char *arg, const char *value) {
  unsigned long long tmp_value;

  if (!string_is_number(value)) {
    invalid_value(arg, value);
  }

  tmp_value = (unsigned long long)atoll(value);

  if (tmp_value >= UINT_MAX) {
    invalid_value(arg, value);
  }

  return (unsigned int)tmp_value;
}

void args_parse(Parameters *params, int argc, char **argv) {
  char *arg;
  const char *value;

  strlcpy(params->project_path, DATADIR "/default", STR_LEN);
  strlcpy(params->config_file, "forge_project.cfg", STR_LEN);
  params->hot_reload = false;
  params->output = true;
  params->output_screen = 0;
  params->monitor = false;
  params->monitor_screen = 0;
  params->windowed = false;
  params->base_tempo = 60.0f;
  params->demo = false;
  params->auto_random = false;
  params->auto_random_cycle = 4;
  params->video_in.length = 0;
  params->video_size = 0;
  params->internal_size = 720;
  params->load_state = true;
  params->save_state = true;
  params->trace_midi = false;
  params->trace_fps = false;

  for (int i = 1; i < argc; i++) {
    arg = argv[i];
    value = split_arg_value(arg);
    if (is_arg(arg, "-h") || is_arg(arg, "--help")) {
      print_help(EXIT_SUCCESS);
    } else if (is_arg(arg, "-v") || is_arg(arg, "--version")) {
      puts(PACKAGE " " VERSION);
      exit(EXIT_SUCCESS);
    } else if (is_arg(arg, "-p") || is_arg(arg, "--project")) {
      strlcpy(params->project_path, value, STR_LEN);
    } else if (is_arg(arg, "-c") || is_arg(arg, "--config")) {
      strlcpy(params->config_file, value, STR_LEN);
    } else if (is_arg(arg, "-hr") || is_arg(arg, "--hot-reload")) {
      params->hot_reload = true;
    } else if (is_arg(arg, "-s") || is_arg(arg, "--screen")) {
      params->output_screen = parse_uint(arg, value);
    } else if (is_arg(arg, "-m") || is_arg(arg, "--monitor")) {
      params->monitor = true;
      params->monitor_screen = parse_uint(arg, value);
    } else if (is_arg(arg, "-mo") || is_arg(arg, "--monitor-only")) {
      params->output = false;
      params->monitor = true;
    } else if (is_arg(arg, "-w") || is_arg(arg, "--windowed")) {
      params->windowed = true;
    } else if (is_arg(arg, "-t") || is_arg(arg, "--tempo")) {
      params->base_tempo = (float)parse_uint(arg, value);
    } else if (is_arg(arg, "-d") || is_arg(arg, "--demo")) {
      params->demo = true;
      params->load_state = false;
      params->save_state = false;
      params->auto_random = true;
    } else if (is_arg(arg, "-ar") || is_arg(arg, "--auto-random")) {
      params->auto_random = true;
    } else if (is_arg(arg, "-nar") || is_arg(arg, "--no-auto-random")) {
      params->auto_random = false;
    } else if (is_arg(arg, "-arc") || is_arg(arg, "--auto-random-cycle")) {
      params->auto_random_cycle = parse_uint(arg, value);
      if (params->auto_random_cycle == 0) {
        invalid_value(arg, value);
      }
    } else if (is_arg(arg, "-vi") || is_arg(arg, "--video-in")) {
#ifdef VIDEO_IN
      if (params->video_in.length == MAX_VIDEO) {
        log_error("maximum video input reached");
        exit(EXIT_FAILURE);
      }
      strlcpy(params->video_in.values[params->video_in.length++], value,
              STR_LEN);
#else
      invalid_arg(arg);
#endif /* VIDEO_IN */
    } else if (is_arg(arg, "-vs") || is_arg(arg, "--video-size")) {
#ifdef VIDEO_IN
      params->video_size = parse_uint(arg, value);
      if (params->video_size == 0) {
        invalid_value(arg, value);
      }
#else
      invalid_arg(arg);
#endif /* VIDEO_IN */
    } else if (is_arg(arg, "-is") || is_arg(arg, "--internal-size")) {
      params->internal_size = parse_uint(arg, value);
      if (params->internal_size == 0) {
        invalid_value(arg, value);
      }
    } else if (is_arg(arg, "-ls") || is_arg(arg, "--load-state")) {
      params->load_state = true;
    } else if (is_arg(arg, "-nls") || is_arg(arg, "--no-load-state")) {
      params->load_state = false;
    } else if (is_arg(arg, "-ss") || is_arg(arg, "--save-state")) {
      params->save_state = true;
    } else if (is_arg(arg, "-nss") || is_arg(arg, "--no-save-state")) {
      params->save_state = false;
    } else if (is_arg(arg, "-tm") || is_arg(arg, "--trace-midi")) {
      params->trace_midi = true;
    } else if (is_arg(arg, "-tf") || is_arg(arg, "--trace-fps")) {
      params->trace_fps = true;
    } else {
      invalid_arg(arg);
    }
  }

  if (params->monitor && params->output &&
      params->monitor_screen == params->output_screen && !params->windowed) {
    log_error("monitor screen cannot be the same as output screen");
    exit(EXIT_FAILURE);
  }

  if (params->video_size == 0) {
    params->video_size = params->internal_size;
  }
}