/*
  Copyright 2007-2022 David Robillard <d@drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#define _POSIX_C_SOURCE 200809L
#define _XOPEN_SOURCE 600
#define _BSD_SOURCE 1
#define _DEFAULT_SOURCE 1

#include "jalv_config.h"
#include "jalv_internal.h"

#include "lilv/lilv.h"
#include "lv2/ui/ui.h"
#include "suil/suil.h"
#include "zix/common.h"
#include "zix/sem.h"

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static int
print_usage(const char* name, bool error)
{
  FILE* const os = error ? stderr : stdout;
  fprintf(os, "Usage: %s [OPTION...] PLUGIN_URI\n", name);
  fprintf(os, "Run an LV2 plugin as a Jack application.\n");
  fprintf(os, "  -b SIZE      Buffer size for plugin <=> UI communication\n");
  fprintf(os, "  -c SYM=VAL   Set control value (e.g. \"vol=1.4\")\n");
  fprintf(os, "  -d           Dump plugin <=> UI communication\n");
  fprintf(os, "  -h           Display this help and exit\n");
  fprintf(os, "  -i           Ignore keyboard input, run non-interactively\n");
  fprintf(os, "  -l DIR       Load state from save directory\n");
  fprintf(os, "  -n NAME      JACK client name\n");
  fprintf(os, "  -p           Print control output changes to stdout\n");
  fprintf(os, "  -s           Show plugin UI if possible\n");
  fprintf(os, "  -t           Print trace messages from plugin\n");
  fprintf(os, "  -U URI       Load the UI with the given URI\n");
  fprintf(os, "  -V           Display version information and exit\n");
  fprintf(os, "  -x           Exact JACK client name (exit if taken)\n");
  return error ? 1 : 0;
}

static int
print_version(void)
{
  printf("jalv " JALV_VERSION " <http://drobilla.net/software/jalv>\n");
  printf("Copyright 2011-2022 David Robillard <d@drobilla.net>.\n"
         "License ISC: <https://spdx.org/licenses/ISC>.\n"
         "This is free software; you are free to change and redistribute it."
         "\nThere is NO WARRANTY, to the extent permitted by law.\n");
  return 1;
}

void
jalv_ui_port_event(Jalv*       jalv,
                   uint32_t    port_index,
                   uint32_t    buffer_size,
                   uint32_t    protocol,
                   const void* buffer)
{
  if (jalv->ui_instance) {
    suil_instance_port_event(
      jalv->ui_instance, port_index, buffer_size, protocol, buffer);
  }
}

int
jalv_init(int* argc, char*** argv, JalvOptions* opts)
{
  int n_controls = 0;
  int a          = 1;
  for (; a < *argc && (*argv)[a][0] == '-'; ++a) {
    if ((*argv)[a][1] == 'h') {
      return print_usage((*argv)[0], true);
    }

    if ((*argv)[a][1] == 'V') {
      return print_version();
    }

    if ((*argv)[a][1] == 's') {
      opts->show_ui = true;
    } else if ((*argv)[a][1] == 'p') {
      opts->print_controls = true;
    } else if ((*argv)[a][1] == 'U') {
      if (++a == *argc) {
        fprintf(stderr, "Missing argument for -U\n");
        return 1;
      }
      opts->ui_uri = jalv_strdup((*argv)[a]);
    } else if ((*argv)[a][1] == 'l') {
      if (++a == *argc) {
        fprintf(stderr, "Missing argument for -l\n");
        return 1;
      }
      opts->load = jalv_strdup((*argv)[a]);
    } else if ((*argv)[a][1] == 'b') {
      if (++a == *argc) {
        fprintf(stderr, "Missing argument for -b\n");
        return 1;
      }
      opts->buffer_size = atoi((*argv)[a]);
    } else if ((*argv)[a][1] == 'c') {
      if (++a == *argc) {
        fprintf(stderr, "Missing argument for -c\n");
        return 1;
      }
      opts->controls =
        (char**)realloc(opts->controls, (++n_controls + 1) * sizeof(char*));
      opts->controls[n_controls - 1] = (*argv)[a];
      opts->controls[n_controls]     = NULL;
    } else if ((*argv)[a][1] == 'i') {
      opts->non_interactive = true;
    } else if ((*argv)[a][1] == 'd') {
      opts->dump = true;
    } else if ((*argv)[a][1] == 't') {
      opts->trace = true;
    } else if ((*argv)[a][1] == 'n') {
      if (++a == *argc) {
        fprintf(stderr, "Missing argument for -n\n");
        return 1;
      }
      free(opts->name);
      opts->name = jalv_strdup((*argv)[a]);
    } else if ((*argv)[a][1] == 'x') {
      opts->name_exact = 1;
    } else {
      fprintf(stderr, "Unknown option %s\n", (*argv)[a]);
      return print_usage((*argv)[0], true);
    }
  }

  return 0;
}

const char*
jalv_native_ui_type(void)
{
  return NULL;
}

static void
jalv_print_controls(Jalv* jalv, bool writable, bool readable)
{
  for (size_t i = 0; i < jalv->controls.n_controls; ++i) {
    ControlID* const control = jalv->controls.controls[i];
    if ((control->is_writable && writable) ||
        (control->is_readable && readable)) {
      struct Port* const port = &jalv->ports[control->index];
      printf("%s = %f\n", lilv_node_as_string(control->symbol), port->control);
    }
  }

  fflush(stdout);
}

static int
jalv_print_preset(Jalv*           ZIX_UNUSED(jalv),
                  const LilvNode* node,
                  const LilvNode* title,
                  void*           ZIX_UNUSED(data))
{
  printf("%s (%s)\n", lilv_node_as_string(node), lilv_node_as_string(title));
  return 0;
}

static void
jalv_process_command(Jalv* jalv, const char* cmd)
{
  char     sym[1024];
  uint32_t index = 0;
  float    value = 0.0f;
  if (!strncmp(cmd, "help", 4)) {
    fprintf(stderr,
            "Commands:\n"
            "  help              Display this help message\n"
            "  controls          Print settable control values\n"
            "  monitors          Print output control values\n"
            "  presets           Print available presets\n"
            "  preset URI        Set preset\n"
            "  set INDEX VALUE   Set control value by port index\n"
            "  set SYMBOL VALUE  Set control value by symbol\n"
            "  SYMBOL = VALUE    Set control value by symbol\n");
  } else if (strcmp(cmd, "presets\n") == 0) {
    jalv_unload_presets(jalv);
    jalv_load_presets(jalv, jalv_print_preset, NULL);
  } else if (sscanf(cmd, "preset %1023[a-zA-Z0-9_:/-.#]\n", sym) == 1) {
    LilvNode* preset = lilv_new_uri(jalv->world, sym);
    jalv_apply_preset(jalv, preset);
    lilv_node_free(preset);
    jalv_print_controls(jalv, true, false);
  } else if (strcmp(cmd, "controls\n") == 0) {
    jalv_print_controls(jalv, true, false);
  } else if (strcmp(cmd, "monitors\n") == 0) {
    jalv_print_controls(jalv, false, true);
  } else if (sscanf(cmd, "set %u %f", &index, &value) == 2) {
    if (index < jalv->num_ports) {
      jalv->ports[index].control = value;
      jalv_print_control(jalv, &jalv->ports[index], value);
    } else {
      fprintf(stderr, "error: port index out of range\n");
    }
  } else if (sscanf(cmd, "set %1023[a-zA-Z0-9_] %f", sym, &value) == 2 ||
             sscanf(cmd, "%1023[a-zA-Z0-9_] = %f", sym, &value) == 2) {
    struct Port* port = NULL;
    for (uint32_t i = 0; i < jalv->num_ports; ++i) {
      struct Port*    p = &jalv->ports[i];
      const LilvNode* s = lilv_port_get_symbol(jalv->plugin, p->lilv_port);
      if (!strcmp(lilv_node_as_string(s), sym)) {
        port = p;
        break;
      }
    }
    if (port) {
      port->control = value;
      jalv_print_control(jalv, port, value);
    } else {
      fprintf(stderr, "error: no control named `%s'\n", sym);
    }
  } else {
    fprintf(stderr, "error: invalid command (try `help')\n");
  }
}

bool
jalv_discover_ui(Jalv* jalv)
{
  return jalv->opts.show_ui;
}

static bool
jalv_run_custom_ui(Jalv* jalv)
{
#ifdef HAVE_SUIL
  const LV2UI_Idle_Interface* idle_iface = NULL;
  const LV2UI_Show_Interface* show_iface = NULL;
  if (jalv->ui && jalv->opts.show_ui) {
    jalv_ui_instantiate(jalv, jalv_native_ui_type(), NULL);
    idle_iface = (const LV2UI_Idle_Interface*)suil_instance_extension_data(
      jalv->ui_instance, LV2_UI__idleInterface);
    show_iface = (const LV2UI_Show_Interface*)suil_instance_extension_data(
      jalv->ui_instance, LV2_UI__showInterface);
  }

  if (show_iface && idle_iface) {
    show_iface->show(suil_instance_get_handle(jalv->ui_instance));

    // Drive idle interface until interrupted
    while (!zix_sem_try_wait(&jalv->done)) {
      jalv_update(jalv);
      if (idle_iface->idle(suil_instance_get_handle(jalv->ui_instance))) {
        break;
      }
      usleep(33333);
    }

    show_iface->hide(suil_instance_get_handle(jalv->ui_instance));
    return true;
  }
#endif

  return false;
}

float
jalv_ui_refresh_rate(Jalv* ZIX_UNUSED(jalv))
{
  return 30.0f;
}

float
jalv_ui_scale_factor(Jalv* ZIX_UNUSED(jalv))
{
  return 1.0f;
}

int
jalv_open_ui(Jalv* jalv)
{
  if (!jalv_run_custom_ui(jalv) && !jalv->opts.non_interactive) {
    // Primitive command prompt for setting control values
    while (!zix_sem_try_wait(&jalv->done)) {
      char line[1024];
      printf("> ");
      if (fgets(line, sizeof(line), stdin)) {
        jalv_process_command(jalv, line);
      } else {
        break;
      }
    }
  } else {
    zix_sem_wait(&jalv->done);
  }

  // Caller waits on the done sem, so increment it again to exit
  zix_sem_post(&jalv->done);

  return 0;
}

int
jalv_close_ui(Jalv* jalv)
{
  zix_sem_post(&jalv->done);
  return 0;
}