#include <assert.h>
#include <stdio.h>
#include <gccore.h>
#include <wiiuse/wpad.h>
#include <stdlib.h>
#include <stdarg.h>

#define TEST_INTERNAL
#include "test.h"

typedef u32 et_test_status;

#define test_current(_plan) ((_plan)->tests + (_plan)->current_test)

static int crit_test_fail_init(const struct et_state *state, void *data, et_state_init_data init_data) {
  struct et_test_plan *plan = init_data.p;
  struct et_test_plan_entry *last_ent;

  *(void **)data = plan;

  assert(plan->current_test > 0); /* NOTE: current_test has been incremented by this point */

  last_ent = plan->tests + (plan->current_test - 1);

  printf("\nCritical test failed: [%4s] %s\n", et_test_get_status_mnemonic(last_ent->status), last_ent->test->name);
  if (last_ent->ext_status) {
    printf("Test says:\n%s\n", last_ent->ext_status);
  } else {
    printf("No extended status.\n");
  }

  putchar('\n');

  printf("Press A to continue.\n");
  printf("Press B to finish testing.\n");
  printf("Press HOME/START to exit.\n");

  return 0;
}

static int crit_test_fail_tick(const struct et_state *state, void *data, struct et_next_state *next_state) {
  struct et_test_plan *plan = *(void **)data;
  u32 wpad_pressed = WPAD_ButtonsDown(0);
  u32 pad_pressed = PAD_ButtonsDown(0);

  if (wpad_pressed & WPAD_BUTTON_A || pad_pressed & PAD_BUTTON_A) {
    next_state->state = et_state_begin_testing; /* also works to resume testing */
    next_state->init_data.p = plan; /* test plan */
    return 1;
  }

  if (wpad_pressed & WPAD_BUTTON_B || pad_pressed & PAD_BUTTON_B) {
    next_state->state = plan->next_state;
    next_state->init_data = plan->next_state_init;
    return 1;
  }

  if (wpad_pressed & WPAD_BUTTON_HOME || pad_pressed & PAD_BUTTON_START) {
    printf("Goodbye!\n");
    exit(0);
  }

  return 0;
}

static void crit_test_fail_cleanup(const struct et_state *state, void *data) {
  /* do nothing */
}

static const struct et_state state_crit_test_fail = {
  .private_size = sizeof(struct et_test_plan *),
  .init_f = crit_test_fail_init,
  .tick_f = crit_test_fail_tick,
  .cleanup_f = crit_test_fail_cleanup
};

int test_next(struct et_test_plan *plan, struct et_next_state *next_state) {
  /* NOTE: this function doesn't increment current_test because the incremented value
   * would be visible in the cleanup function of the test state. */

  /* NOTE: this condition will not trigger for states that leak their TEST_PRIMORDIAL status.
   * I don't care about this situation so much, since that should only happen for bugged tests. */
  const struct et_test_plan_entry *ent = test_current(plan);
  switch (TEST_STATUS_GET_TYPE(ent->status)) {
    case TEST_SERROR:
    case TEST_SFAIL:
      if (ent->test->flags & TEST_PAUSE_ON_ERROR) {
        next_state->state = &state_crit_test_fail;
        next_state->init_data.p = plan;
        return 1;
      }
      break;
    default:
      /* do nothing */
      (void)0;
  }

  if (plan->current_test == plan->num_tests - 1) {
    /* this is the last state... we're done! */
    next_state->state = plan->next_state;
    next_state->init_data = plan->next_state_init;
  } else {
    next_state->state = &plan->tests[plan->current_test + 1].test->parent;
    next_state->init_data.p = plan;
  }

  return 1; /* always return 1: advance to next state */
}

int test_state_init(const struct et_state *state, void *data, et_state_init_data init_data) {
  struct et_test_plan *plan = init_data.p;
  struct et_test_state_private_base *testdata = data;
  struct et_test_plan_entry *cur = test_current(plan);
  const struct et_test *test = (const struct et_test *)state;

  testdata->plan = plan;

  assert(cur->test == test); /* ensure correct test was loaded */
  assert(TEST_STATUS_IS_CLEAN(cur->status));

  if (test->test_init_f) {
    return test->test_init_f(state, data, init_data);
  }

  return 0;
}

void test_state_cleanup(const struct et_state *state, void *data) {
  struct et_test_state_private_base *testdata = data;
  struct et_test_plan_entry *cur = test_current(testdata->plan);
  const struct et_test *test = (const struct et_test *)state;

  if (test->test_cleanup_f) {
    test->test_cleanup_f(state, data);
  }

  if (TEST_STATUS_IS_CLEAN(cur->status)) {
    /* test didn't set status :( */
    test_plan_entry_set_error_static(cur, "test aborted");
    cur->status = TEST_ERROR(TEST_EABORT);
  }

  printf("[%4s] %s\n", et_test_get_status_mnemonic(cur->status), test->name);

  ++testdata->plan->current_test;
}

static int begin_testing_init(const struct et_state *state, void *state_data, et_state_init_data init_data) {
  struct et_test_plan *test_plan = init_data.p;
  struct et_test_plan **pst_test_plan = state_data;
  *pst_test_plan = test_plan;
  return 0;
}

static int begin_testing_tick(const struct et_state *state, void *state_data, struct et_next_state *next_state) {
  struct et_test_plan **ptest_plan = state_data;
  struct et_test_plan *test_plan = *ptest_plan;

  assert(test_plan->current_test <= test_plan->num_tests);

  if (test_plan->current_test < test_plan->num_tests) {
    const struct et_test_plan_entry *next_test = test_plan->tests + test_plan->current_test;
    assert(test_plan->tests);
    assert(next_test->status == TEST_PRIMORDIAL);

    next_state->state = &next_test->test->parent;
    next_state->init_data.p = test_plan;
  } else {
    /* no tests to run in this plan */
    next_state->state = test_plan->next_state;
    next_state->init_data = test_plan->next_state_init;
  }

  return 1;

}

static void begin_testing_cleanup(const struct et_state *state, void *state_data) {
  /* do nothing */
}

static const struct et_state state_begin_testing_struct = {
  .private_size = sizeof(const struct et_test_plan *),
  .init_f = begin_testing_init,
  .tick_f = begin_testing_tick,
  .cleanup_f = begin_testing_cleanup
};

const struct et_state *et_state_begin_testing = &state_begin_testing_struct;

static int summ_test_plan_init(const struct et_state *state, void *state_data, et_state_init_data init_data) {
  struct et_test_plan *ptest_plan = (*(struct et_test_plan **)state_data = init_data.p);
  size_t passed = 0;
  size_t failed = 0;
  size_t errored = 0;
  size_t skipped = 0;
  size_t unknown = 0;

  for (size_t i = 0; i < ptest_plan->num_tests; ++i) {
    switch (TEST_STATUS_GET_TYPE(ptest_plan->tests[i].status)) {
      case TEST_SPASS: ++passed; break;
      case TEST_SFAIL: ++failed; break;
      case TEST_SERROR: ++errored; break;
      case TEST_SSKIPPED: ++skipped; break;
      default: ++unknown; break;
    }
  }

  printf("\nTesting complete.\nPASS: %zu, FAIL: %zu, ERROR: %zu, SKIP: %zu, UNK: %zu\n\n", passed, failed, errored, skipped, unknown);

  puts("Press A to test again. Press HOME/START to exit.");

  return 0;
}

static int summ_test_plan_tick(const struct et_state *state, void *state_data, struct et_next_state *next_state) {
  u32 wpad_buttons = WPAD_ButtonsDown(0);
  u32 pad_buttons = PAD_ButtonsDown(0);

  if (wpad_buttons & WPAD_BUTTON_A || pad_buttons & PAD_BUTTON_A) {
    next_state->state = et_state_setup;
    next_state->init_data = et_init_data_null;
    return 1;
  }

  if (wpad_buttons & WPAD_BUTTON_HOME || pad_buttons & PAD_BUTTON_START) {
    puts("Goodbye!");
    exit(0);
  }

  return 0;
}

static void summ_test_plan_cleanup(const struct et_state *state, void *state_data) {
  struct et_test_plan *ptest_plan = *(void **)state_data;

  for (size_t i = 0; i < ptest_plan->num_tests; ++i) {
    et_test_plan_entry_cleanup(ptest_plan->tests + i);
  }

  free(ptest_plan->tests);
  free(ptest_plan);
}

static const struct et_state summ_test_plan_struct = {
  .private_size = sizeof(struct et_test_plan *),
  .init_f = summ_test_plan_init,
  .tick_f = summ_test_plan_tick,
  .cleanup_f = summ_test_plan_cleanup
};

const struct et_state *et_state_summarize_test_plan = &summ_test_plan_struct;

#define COUNT_TESTS(_x) 1
#define NUM_TESTS FOREACH_TEST(COUNT_TESTS, +)
static const struct et_test *all_tests[NUM_TESTS + 1];
static bool tests_array_initialized = false;

const struct et_test *const *et_get_tests(size_t *ntests) {
  size_t idx = 0;

  if (ntests) *ntests = NUM_TESTS;
  if (tests_array_initialized) return all_tests;

#define A(_name) all_tests[idx++] = TEST_SYM(_name)
  FOREACH_TEST(A, ;);
#undef A

  all_tests[idx] = NULL;

  tests_array_initialized = true;
  return all_tests;
}

static const char *error_oom = "(failed to allocate error message)";
static const char *error_bad_fmt = "(bad extended error format)";

void et_test_plan_entry_cleanup(struct et_test_plan_entry *entry) {
  if (entry->ext_status_free) {
    /* okay to cast away const here. we're careful about making sure this pointer is non-NULL iff this pointer
     * was malloc'd */
    entry->ext_status_free((void *)entry->ext_status);
  }

  entry->ext_status = NULL;
  entry->ext_status_free = NULL;
}

void test_plan_entry_set_error(struct et_test_plan_entry *entry, const char *fmt, ...) {
  int res;
  va_list vp;
  char *dest;
  size_t dest_sz;

  et_test_plan_entry_cleanup(entry);

  va_start(vp, fmt);
  res = vsnprintf(NULL, 0, fmt, vp);
  va_end(vp);

  if (res < 0) {
    entry->ext_status = error_bad_fmt;
    entry->ext_status_free = NULL;
    return;
  }

  dest_sz = MIN((size_t)res + 1, (size_t)1024);
  dest = malloc(dest_sz);
  dest[0] = '\0';

  if (!dest) {
    entry->ext_status = error_oom;
    entry->ext_status_free = NULL;
    return;
  }

  va_start(vp, fmt);
  res = vsnprintf(dest, dest_sz, fmt, vp);
  va_end(vp);

  dest[dest_sz - 1] = '\0';

  assert(res >= 0);

  entry->ext_status = dest;
  entry->ext_status_free = free;
}

void test_plan_entry_set_error_static(struct et_test_plan_entry *entry, const char *str) {
  et_test_plan_entry_cleanup(entry);
  entry->ext_status = str;
  entry->ext_status_free = NULL;
}

const char *et_test_get_status_mnemonic(et_test_status status) {
  switch (TEST_STATUS_GET_TYPE(status)) {
    case TEST_SPASS: return "PASS";
    case TEST_SFAIL: return "FAIL";
    case TEST_SSKIPPED:
      if (TEST_STATUS_IS_CLEAN(status)) {
        return "SKI!";
      } else {
        return "SKIP";
      }
    case TEST_SERROR:
      switch (TEST_STATUS_GET_ERROR(status)) {
        case TEST_ENONE: return "ERR0";
        case TEST_EABORT: return "ERRA";
        default: return "ERRP";
      }
    default:
      return "UNKS";
  }
}