import { z } from "zod";
export const boundsSchema = z
  .object({
    minX: z.number().int(),
    minZ: z.number().int(),
    maxX: z.number().int(),
    maxZ: z.number().int(),
  })
  .refine(
    (b) =>
      b.maxX > b.minX &&
      b.maxZ > b.minZ &&
      b.maxX - b.minX <= 2048 &&
      b.maxZ - b.minZ <= 2048,
    "Bounds must be positive and at most 2048 blocks per side",
  );
export const pointSchema = z.object({
  x: z.number().finite(),
  y: z.number().finite(),
  z: z.number().finite(),
});
export const faces = ["px", "nx", "py", "ny", "pz", "nz"] as const;
export const datasetSchema = z
  .object({
    format: z.literal("minegeo-dataset/v1"),
    minecraftVersion: z.literal("1.21.11"),
    dimension: z.literal("minecraft:overworld"),
    source: z.enum(["plugin", "fabric"]),
    name: z.string().min(3).max(80),
    description: z.string().max(2000).default(""),
    serverName: z.string().min(2).max(80),
    serverAddress: z.string().max(255).optional(),
    bounds: boundsSchema,
    north: z.literal("-z"),
    viewpoints: z
      .array(
        pointSchema.extend({ id: z.string().regex(/^[a-zA-Z0-9_-]{1,64}$/) }),
      )
      .min(5)
      .max(100),
    assets: z
      .array(
        z.object({
          path: z
            .string()
            .regex(/^[a-zA-Z0-9_./-]+$/)
            .refine((s) => !s.includes("..") && !s.startsWith("/")),
          sha256: z.string().regex(/^[a-f0-9]{64}$/),
          bytes: z
            .number()
            .int()
            .positive()
            .max(50 * 1024 * 1024),
        }),
      )
      .max(4096),
  })
  .superRefine((d, ctx) => {
    if (new Set(d.viewpoints.map((p) => p.id)).size !== d.viewpoints.length)
      ctx.addIssue({ code: "custom", message: "Viewpoint IDs must be unique" });
    if (new Set(d.assets.map((a) => a.path)).size !== d.assets.length)
      ctx.addIssue({ code: "custom", message: "Asset paths must be unique" });
    for (const p of d.viewpoints)
      if (
        p.x < d.bounds.minX ||
        p.x > d.bounds.maxX ||
        p.z < d.bounds.minZ ||
        p.z > d.bounds.maxZ
      )
        ctx.addIssue({
          code: "custom",
          message: "Viewpoint outside map bounds",
        });
  });
export type DatasetManifest = z.infer<typeof datasetSchema>;
export type Bounds = z.infer<typeof boundsSchema>;
export type Point = z.infer<typeof pointSchema>;
export const difficulties = {
  easy: { seconds: 180, zoom: true, label: "Easy" },
  normal: { seconds: 90, zoom: true, label: "Normal" },
  hard: { seconds: 30, zoom: false, label: "Hard" },
} as const;
export type Difficulty = keyof typeof difficulties;
export function scoreGuess(
  a: Pick<Point, "x" | "z">,
  b: Pick<Point, "x" | "z">,
  bounds: Bounds,
) {
  const distance = Math.hypot(a.x - b.x, a.z - b.z);
  return {
    distance,
    score:
      distance <= 1
        ? 5000
        : Math.round(
            5000 *
              Math.exp(
                (-5 * distance) /
                  Math.hypot(
                    bounds.maxX - bounds.minX,
                    bounds.maxZ - bounds.minZ,
                  ),
              ),
          ),
  };
}
export type TerrainBlock = [number, number, number, string, string?];
export type TerrainSnapshot = {
  bounds: Bounds;
  blocks: TerrainBlock[];
  coverage: [number, number][];
};