export const GIT_SUMMARY_SCOPE = "current_project" as const;

export interface GitSummaryCounts {
	changed: number;
	staged: number;
	dirty: number;
	untracked: number;
	conflicts: number;
}

export interface GitSummaryFile {
	path: string;
	repoPath: string;
	status: string;
	staged: boolean;
	dirty: boolean;
	untracked: boolean;
	conflict: boolean;
}

export interface GitSummaryProjectScope {
	scope: typeof GIT_SUMMARY_SCOPE;
	cwd: string;
	repoRoot: string | null;
	repoRelativePath: string | null;
}

export interface GitSummaryRepoResponse {
	kind: "repo";
	project: GitSummaryProjectScope & {
		repoRoot: string;
	};
	branch: string | null;
	mainBranch: string | null;
	hasChanges: boolean;
	hasConflicts: boolean;
	counts: GitSummaryCounts;
	changedFiles: GitSummaryFile[];
	truncatedFileCount: number;
}

export interface GitSummaryNotRepoResponse {
	kind: "not_repo";
	project: GitSummaryProjectScope;
	message: string;
}

export type GitSummaryResponse =
	| GitSummaryRepoResponse
	| GitSummaryNotRepoResponse;

export function isGitSummaryResponse(
	value: unknown,
): value is GitSummaryResponse {
	if (!value || typeof value !== "object") return false;

	const response = value as Partial<GitSummaryResponse>;
	if (response.kind !== "repo" && response.kind !== "not_repo") return false;
	if (!response.project || typeof response.project !== "object") return false;
	if (response.project.scope !== GIT_SUMMARY_SCOPE) return false;
	if (typeof response.project.cwd !== "string") return false;

	if (response.kind === "not_repo") {
		return typeof (response as GitSummaryNotRepoResponse).message === "string";
	}

	const repo = response as Partial<GitSummaryRepoResponse>;
	if (typeof repo.project?.repoRoot !== "string") return false;
	if (
		typeof repo.hasChanges !== "boolean" ||
		typeof repo.hasConflicts !== "boolean"
	)
		return false;
	if (!repo.counts || typeof repo.counts !== "object") return false;
	if (!Array.isArray(repo.changedFiles)) return false;
	if (typeof repo.truncatedFileCount !== "number") return false;

	return (
		typeof repo.counts.changed === "number" &&
		typeof repo.counts.staged === "number" &&
		typeof repo.counts.dirty === "number" &&
		typeof repo.counts.untracked === "number" &&
		typeof repo.counts.conflicts === "number"
	);
}