import { getPayload } from "payload";
import config from "@payload-config";
import { ALL_PERMISSION_VALUES, type Permission } from "@/permissions";

const resolvedConfig = await config;
const COLLECTION_SLUGS = resolvedConfig.collections.map((c) => c.slug);

const ALL_COLLECTION_READS: Permission[] = COLLECTION_SLUGS.map(
  (slug) => `${slug}:read` as Permission,
);

const ALL_ADMIN_PAGE_MANAGE: Permission[] = COLLECTION_SLUGS.map(
  (slug) => `admin:${slug}:manage` as Permission,
);

/**
 * Registry grants only: the Roles field's select options come from the
 * permission registry, so collection reads generated for plugin-injected
 * collections (story-beats, voice-submissions, ...) are not grantable and
 * would fail validation.
 */
const GRANTABLE = new Set<string>(ALL_PERMISSION_VALUES);
const grantable = (permissions: Permission[]): Permission[] =>
  permissions.filter((p) => GRANTABLE.has(p));

/**
 * Read-only baseline (grantable collection reads + global reads). No write
 * permissions on purpose: admin-page visibility must stay scoped to division
 * roles' manage grants. `<slug>:read` alone never grants admin panel entry
 * (that needs a superuser role or any `admin:<slug>:manage`).
 */
const USER_PERMISSIONS: Permission[] = [
  ...grantable(ALL_COLLECTION_READS),
  "game-rules:read",
  "shims:read",
];

const ADMIN_PERMISSIONS: Permission[] = [
  ...new Set<Permission>([
    ...USER_PERMISSIONS,
    "system:admin-access",
    "users:read",
    "users:update",
    "users:delete",
    "technologies:create",
    "technologies:read",
    "technologies:update",
    "technologies:delete",
    "tickets:read",
    "tickets:update",
    "tickets:staff",
    "bank-accounts:create",
    "bank-accounts:update",
    "user-notifications:read",
    "user-notifications:update",
    "mission-attendances:create",
    "mission-attendances:read",
    "mission-attendances:update",
    "mission-attendances:delete",
    "missions:read",
    "market-negotiations:read",
    "market-negotiations:update",
    "logistics:manage",
    "banking:manage",
    "discord:staff",
    "discord:announce",
    "forms:create",
    "forms:read",
    "forms:update",
    "forms:delete",
    "form-submissions:read",
    "structures:create",
    "structures:update",
    "maps:place",
    "map-roads:author",
    "map-zones:author",
    "resource-nodes:author",
    ...ALL_COLLECTION_READS,
    ...ALL_ADMIN_PAGE_MANAGE,
  ]),
];

interface BuiltinRole {
  slug: string;
  name: string;
  description: string;
  permissions: Permission[];
  isSystem: boolean;
  isSuperuser: boolean;
}

const BUILTIN_ROLES: BuiltinRole[] = [
  {
    slug: "guest",
    name: "Guest",
    description: "Default role for unauthenticated or basic users. No permissions.",
    permissions: [],
    isSystem: true,
    isSuperuser: false,
  },
  {
    slug: "user",
    name: "User",
    description: "Standard authenticated user. Can manage shipments, structures, and read profiles.",
    permissions: [...USER_PERMISSIONS],
    isSystem: true,
    isSuperuser: false,
  },
  {
    slug: "admin",
    name: "Admin",
    description: "Administrator. Can manage users, tickets, banking, logistics, and most collections.",
    permissions: [...ADMIN_PERMISSIONS],
    isSystem: true,
    isSuperuser: false,
  },
  {
    slug: "developer",
    name: "Developer",
    description: "Superuser. Bypasses all permission checks. Full access to everything.",
    permissions: [],
    isSystem: true,
    isSuperuser: true,
  },
];

const ENUM_TO_SLUG: Record<string, string> = {
  guest: "guest",
  user: "user",
  trusted: "user",
  admin: "admin",
  developer: "developer",
};

export const seedRoles = async () => {
  const payload = await getPayload({ config });

  payload.logger.info("Seeding built-in RBAC roles...");

  const roleIdMap = new Map<string, number>();

  for (const role of BUILTIN_ROLES) {
    const existing = await payload.find({
      collection: "roles",
      where: { slug: { equals: role.slug } },
      limit: 1,
      overrideAccess: true,
    });

    if (existing.docs.length > 0) {
      const doc = existing.docs[0] as {
        id: number;
        isSystem?: boolean;
        permissions?: Permission[] | null;
      };
      roleIdMap.set(role.slug, doc.id);

      if (role.isSystem) {
        const existingPerms = (doc.permissions ?? []).filter((p) => GRANTABLE.has(p));
        const missing = grantable(role.permissions).filter((p) => !existingPerms.includes(p));
        if (missing.length > 0) {
          await payload.update({
            collection: "roles",
            id: doc.id,
            data: { permissions: [...existingPerms, ...missing] },
            overrideAccess: true,
          });
          payload.logger.info(
            `  Role "${role.slug}" (id=${doc.id}) updated with ${missing.length} missing built-in permission(s).`,
          );
        } else {
          payload.logger.info(
            `  Role "${role.slug}" already exists (id=${doc.id}), permissions up to date.`,
          );
        }
      } else {
        payload.logger.info(
          `  Role "${role.slug}" already exists (id=${doc.id}), skipping (non-system).`,
        );
      }
      continue;
    }

    const created = await payload.create({
      collection: "roles",
      data: {
        name: role.name,
        slug: role.slug,
        description: role.description,
        permissions: grantable(role.permissions),
        isSystem: role.isSystem,
        isSuperuser: role.isSuperuser,
      },
      overrideAccess: true,
    });

    roleIdMap.set(role.slug, created.id);
    payload.logger.info(`  Created role "${role.slug}" (id=${created.id}).`);
  }

  payload.logger.info("Migrating existing users from roles enum to roleDocs...");

  const users = await payload.find({
    collection: "users",
    limit: 0,
    depth: 0,
    overrideAccess: true,
    select: { roles: true, roleDocs: true },
  });

  let migrated = 0;
  let skipped = 0;

  for (const user of users.docs) {
    const u = user as { id: number; roles?: string[] | null; roleDocs?: unknown[] | null };

    if (u.roleDocs && Array.isArray(u.roleDocs) && u.roleDocs.length > 0) {
      skipped++;
      continue;
    }

    const enumRoles = u.roles ?? [];
    if (enumRoles.length === 0) {
      skipped++;
      continue;
    }

    const roleDocIds: number[] = [];
    const seenSlugs = new Set<string>();

    for (const enumRole of enumRoles) {
      const slug = ENUM_TO_SLUG[enumRole];
      if (!slug || seenSlugs.has(slug)) continue;
      seenSlugs.add(slug);
      const roleId = roleIdMap.get(slug);
      if (roleId) roleDocIds.push(roleId);
    }

    if (roleDocIds.length === 0) {
      skipped++;
      continue;
    }

    await payload.update({
      collection: "users",
      id: user.id,
      data: { roleDocs: roleDocIds },
      overrideAccess: true,
    });
    migrated++;
  }

  payload.logger.info(`Migration complete: ${migrated} users migrated, ${skipped} users skipped.`);
};

await seedRoles();

// CLI script: the Payload pool keeps the event loop alive after completion;
// exit explicitly (same convention as the game-tick bins).
process.exit(0);