export type GitSource = {
  resolver: "git";
  repository: string;
  commit: string;
};

export type QuixosSourcePolicy = "pinned" | "track-release" | "track-development";

// Resource repositories only need the exact Quixos commit they were authored
// against. A workspace root additionally declares how a runtime may advance
// that exact baseline.
export type QuixosSource = GitSource & ({
  policy: QuixosSourcePolicy;
  ref: string;
} | {
  policy?: undefined;
  ref?: undefined;
});

export type LockedResourceKind = "interface" | "package";

export type LockedResource = {
  kind: LockedResourceKind;
  binding: string;
  source: GitSource;
};

export type QuixosLockRootDocument = {
  kind: "root";
  formatVersion: 1;
  quixos: QuixosSource;
  imports: string[];
  resources: LockedResource[];
};

export type QuixosLockFragmentDocument = {
  kind: "fragment";
  formatVersion: 1;
  imports: string[];
  resources: LockedResource[];
};

export type QuixosLockDocument =
  | QuixosLockRootDocument
  | QuixosLockFragmentDocument;

export type QuixosRepositoryLock = {
  formatVersion: 1;
  quixos: QuixosSource;
  resources: LockedResource[];
  sourceFiles?: string[];
};

export type NixGitInput = {
  type: "git";
  url: string;
  ref: string;
  rev: string;
};

export const RETENTION_TAG_PREFIX = "refs/tags/quixos-reachability/";

export const retentionTagForCommit = (commit: string): string =>
  `${RETENTION_TAG_PREFIX}${commit.toLowerCase()}`;

export const nixGitInput = (source: GitSource): NixGitInput => ({
  type: "git",
  url: source.repository,
  ref: retentionTagForCommit(source.commit),
  rev: source.commit.toLowerCase(),
});