#include "ok_map.h"
#include <string.h>

static uint32_t rng_u32(uint32_t *s) {
    *s = *s * 1664525u + 1013904223u;
    return *s;
}

void ok_map_init(OkWorld *w, uint32_t seed) {
    memset(w, 0, sizeof(*w));
    uint32_t s = seed ? seed : 1u;
    for (int y = 0; y < OK_WORLD_H; y++) {
        for (int x = 0; x < OK_WORLD_W; x++) {
            uint32_t r = rng_u32(&s);
            if ((r % 17u) == 0u) w->tiles[y][x] = OK_TILE_BLOCK;
            else if ((r % 11u) == 0u) w->tiles[y][x] = OK_TILE_RES;
            else w->tiles[y][x] = OK_TILE_EMPTY;
        }
    }
    w->tiles[1][1] = OK_TILE_EMPTY;
    w->tiles[OK_WORLD_H - 2][OK_WORLD_W - 2] = OK_TILE_EMPTY;
    w->resources_a = 100;
    w->resources_b = 100;
}

bool ok_map_walkable(const OkWorld *w, int x, int y) {
    if (x < 0 || y < 0 || x >= OK_WORLD_W || y >= OK_WORLD_H) return false;
    return w->tiles[y][x] != OK_TILE_BLOCK;
}