import type { FetchImpl, Provider } from "./types";
export type UsageUnit = "percent" | "tokens" | "requests" | "usd" | "minutes" | "bytes" | "unknown";
export type UsageStatus = "ok" | "warning" | "exhausted" | "unknown";
/** Time window for a limit (e.g. 5h, 7d, monthly). */
export interface UsageWindow {
    /** Stable identifier (e.g. "5h", "7d", "monthly"). */
    id: string;
    /** Human label (e.g. "5 Hour", "7 Day"). */
    label: string;
    /** Window duration in milliseconds, when known. */
    durationMs?: number;
    /** Absolute reset timestamp in milliseconds since epoch. */
    resetsAt?: number;
}
/** Quantitative usage data. */
export interface UsageAmount {
    /** Amount used in the given unit. */
    used?: number;
    /** Maximum limit in the given unit. */
    limit?: number;
    /** Remaining amount in the given unit. */
    remaining?: number;
    /** Fraction used (0..1). */
    usedFraction?: number;
    /** Fraction remaining (0..1). */
    remainingFraction?: number;
    /** Unit for the amounts (percent, tokens, etc.). */
    unit: UsageUnit;
}
/** Scope metadata describing what the limit applies to. */
export interface UsageScope {
    provider: Provider;
    accountId?: string;
    projectId?: string;
    orgId?: string;
    modelId?: string;
    tier?: string;
    windowId?: string;
    shared?: boolean;
}
/** Normalized limit entry for a single window or quota bucket. */
export interface UsageLimit {
    /** Stable identifier for this limit entry. */
    id: string;
    /** Human label for display. */
    label: string;
    scope: UsageScope;
    window?: UsageWindow;
    amount: UsageAmount;
    status?: UsageStatus;
    notes?: string[];
}
/**
 * Per-credit detail for a saved/banked rate-limit reset.
 *
 * Populated when the provider's listing endpoint returns individual credit
 * metadata (e.g. OpenAI Codex `wham/rate-limit-reset-credits`). Callers that
 * only need the count can ignore this; display layers use `expiresAt` to show
 * when banked resets expire ([#3339](https://github.com/can1357/oh-my-pi/issues/3339)).
 */
export interface UsageResetCreditDetail {
    /** ISO timestamp when the credit was granted. */
    grantedAt?: string;
    /** ISO timestamp when the credit expires and can no longer be redeemed. */
    expiresAt?: string;
    /** Backend status, e.g. `available`, `redeemed`. */
    status?: string;
}
/**
 * Saved/banked rate-limit resets an account can redeem on demand.
 *
 * Surfaced by providers that let users defer a usage-window reset and spend it
 * later (OpenAI Codex "saved rate limit resets"). The redeem itself is a
 * separate, provider-specific action; this is the read-only count for display.
 */
export interface UsageResetCredits {
    /** Number of resets available to redeem right now. */
    availableCount: number;
    /** Individual credit details (expiry dates, etc.) when the provider exposes them. */
    credits?: UsageResetCreditDetail[];
}
/** Aggregated usage report for a provider. */
export interface UsageReport {
    provider: Provider;
    fetchedAt: number;
    limits: UsageLimit[];
    /** Saved rate-limit resets the account can redeem, when the provider reports them. */
    resetCredits?: UsageResetCredits;
    /**
     * Provider-wide disclaimers shown once above per-account sections.
     * Use this for caveats that apply to every limit (e.g. "OMP-observed
     * spend only"). Per-limit notes that differ per window (e.g. "Overage
     * requests: N") stay on {@link UsageLimit.notes}.
     */
    notes?: string[];
    metadata?: Record<string, unknown>;
    raw?: unknown;
}
/**
 * Resolve a limit's used fraction (0..1; >1 means overage) from whichever
 * amount fields the provider populated. Precedence mirrors the usage UIs:
 * explicit fraction > used/limit > percent-unit used > inverted remaining.
 */
export declare function resolveUsedFraction(limit: UsageLimit): number | undefined;
/**
 * One recorded usage-limit snapshot: a single limit window of one account at
 * a point in time. The usage cache itself is latest-snapshot-only; history
 * rows are appended by the auth storage layer whenever a fresh report is
 * fetched, so limit utilization stays inspectable over time.
 */
export interface UsageHistoryEntry {
    /** Epoch ms the report was fetched. */
    recordedAt: number;
    provider: Provider;
    /** Stable credential identity key (account/email/project derived). */
    accountKey: string;
    email?: string;
    accountId?: string;
    /** {@link UsageLimit.id} of the recorded window. */
    limitId: string;
    /** Human label of the limit. */
    label: string;
    windowLabel?: string;
    /** Used fraction (0..1) when resolvable. */
    usedFraction?: number;
    status?: UsageStatus;
    /** Epoch ms the window resets, when known. */
    resetsAt?: number;
}
/** Filter for reading recorded usage history. */
export interface UsageHistoryQuery {
    provider?: string;
    /** Inclusive lower bound on {@link UsageHistoryEntry.recordedAt} (epoch ms). */
    sinceMs?: number;
}
/** One observed provider request cost, attributed to the credential that made it. */
export interface UsageCostHistoryEntry {
    /** Epoch ms the request completed. */
    recordedAt: number;
    provider: Provider;
    /** Stable credential identity key (account/email/project/secret derived). */
    accountKey: string;
    /** Estimated request cost in USD. */
    costUsd: number;
}
/** Filter for reading observed request costs. */
export interface UsageCostHistoryQuery {
    provider?: string;
    accountKey?: string;
    /** Inclusive lower bound on {@link UsageCostHistoryEntry.recordedAt} (epoch ms). */
    sinceMs?: number;
}
export declare const usageUnitSchema: import("arktype/internal/variants/string.ts").StringType<"bytes" | "minutes" | "percent" | "requests" | "tokens" | "unknown" | "usd", {}>;
export declare const usageStatusSchema: import("arktype/internal/variants/string.ts").StringType<"exhausted" | "ok" | "unknown" | "warning", {}>;
export declare const usageWindowSchema: import("arktype/internal/variants/object.ts").ObjectType<{
    id: string;
    label: string;
    durationMs?: number | undefined;
    resetsAt?: number | undefined;
}, {}>;
export declare const usageAmountSchema: import("arktype/internal/variants/object.ts").ObjectType<{
    used?: number | undefined;
    limit?: number | undefined;
    remaining?: number | undefined;
    usedFraction?: number | undefined;
    remainingFraction?: number | undefined;
    unit: "bytes" | "minutes" | "percent" | "requests" | "tokens" | "unknown" | "usd";
}, {}>;
export declare const usageScopeSchema: import("arktype/internal/variants/object.ts").ObjectType<{
    provider: string;
    accountId?: string | undefined;
    projectId?: string | undefined;
    orgId?: string | undefined;
    modelId?: string | undefined;
    tier?: string | undefined;
    windowId?: string | undefined;
    shared?: boolean | undefined;
}, {}>;
export declare const usageLimitSchema: import("arktype/internal/variants/object.ts").ObjectType<{
    id: string;
    label: string;
    scope: {
        provider: string;
        accountId?: string | undefined;
        projectId?: string | undefined;
        orgId?: string | undefined;
        modelId?: string | undefined;
        tier?: string | undefined;
        windowId?: string | undefined;
        shared?: boolean | undefined;
    };
    window?: {
        id: string;
        label: string;
        durationMs?: number | undefined;
        resetsAt?: number | undefined;
    } | undefined;
    amount: {
        used?: number | undefined;
        limit?: number | undefined;
        remaining?: number | undefined;
        usedFraction?: number | undefined;
        remainingFraction?: number | undefined;
        unit: "bytes" | "minutes" | "percent" | "requests" | "tokens" | "unknown" | "usd";
    };
    status?: "exhausted" | "ok" | "unknown" | "warning" | undefined;
    notes?: string[] | undefined;
}, {}>;
export declare const usageResetCreditDetailSchema: import("arktype/internal/variants/object.ts").ObjectType<{
    grantedAt?: string | undefined;
    expiresAt?: string | undefined;
    status?: string | undefined;
}, {}>;
export declare const usageResetCreditsSchema: import("arktype/internal/variants/object.ts").ObjectType<{
    availableCount: number;
    credits?: {
        grantedAt?: string | undefined;
        expiresAt?: string | undefined;
        status?: string | undefined;
    }[] | undefined;
}, {}>;
export declare const usageReportSchema: import("arktype/internal/variants/object.ts").ObjectType<{
    provider: string;
    fetchedAt: number;
    limits: {
        id: string;
        label: string;
        scope: {
            provider: string;
            accountId?: string | undefined;
            projectId?: string | undefined;
            orgId?: string | undefined;
            modelId?: string | undefined;
            tier?: string | undefined;
            windowId?: string | undefined;
            shared?: boolean | undefined;
        };
        window?: {
            id: string;
            label: string;
            durationMs?: number | undefined;
            resetsAt?: number | undefined;
        } | undefined;
        amount: {
            used?: number | undefined;
            limit?: number | undefined;
            remaining?: number | undefined;
            usedFraction?: number | undefined;
            remainingFraction?: number | undefined;
            unit: "bytes" | "minutes" | "percent" | "requests" | "tokens" | "unknown" | "usd";
        };
        status?: "exhausted" | "ok" | "unknown" | "warning" | undefined;
        notes?: string[] | undefined;
    }[];
    resetCredits?: {
        availableCount: number;
        credits?: {
            grantedAt?: string | undefined;
            expiresAt?: string | undefined;
            status?: string | undefined;
        }[] | undefined;
    } | undefined;
    notes?: string[] | undefined;
    metadata?: {
        [x: string]: unknown;
    } | undefined;
    raw?: unknown;
}, {}>;
/** Optional logger for usage fetchers. */
export interface UsageLogger {
    debug(message: string, meta?: Record<string, unknown>): void;
    warn(message: string, meta?: Record<string, unknown>): void;
}
/** Credential bundle for usage endpoints. */
export interface UsageCredential {
    type: "api_key" | "oauth";
    apiKey?: string;
    accessToken?: string;
    refreshToken?: string;
    expiresAt?: number;
    accountId?: string;
    projectId?: string;
    email?: string;
    enterpriseUrl?: string;
    metadata?: Record<string, unknown>;
    apiEndpoint?: string;
}
/** Parameters provided to a usage fetcher. */
export interface UsageFetchParams {
    provider: Provider;
    credential: UsageCredential;
    /** Stable credential identity key derived by the auth storage layer. */
    accountKey?: string;
    baseUrl?: string;
    signal?: AbortSignal;
}
/** Shared runtime utilities for fetchers. */
export interface UsageFetchContext {
    fetch: FetchImpl;
    logger?: UsageLogger;
    retryWait?: (delayMs: number, signal?: AbortSignal) => Promise<void>;
    /** Observed request-cost history for providers without upstream usage APIs. */
    listUsageCosts?: (query?: UsageCostHistoryQuery) => UsageCostHistoryEntry[];
}
/** Provider implementation for fetching usage information. */
export interface UsageProvider {
    id: Provider;
    fetchUsage(params: UsageFetchParams, ctx: UsageFetchContext): Promise<UsageReport | null>;
    /** Parse provider rate-limit response headers (lowercased keys) into a usage report, if supported. */
    parseRateLimitHeaders?(headers: Record<string, string>, now?: number): UsageReport | null;
    supports?(params: UsageFetchParams): boolean;
    /** True when fetchUsage contacts upstream and can authenticate the credential for health checks. */
    validatesCredentials?: boolean;
}
/** Request context used when ranking usage for a specific model. */
export interface CredentialRankingContext {
    /** Provider model id, when the caller is selecting a credential for one model. */
    modelId?: string;
}
/** Strategy for usage-based credential ranking. Providers implement this to opt into smart credential selection. */
export interface CredentialRankingStrategy {
    /** Extract the primary (short) and secondary (long) window limits from a usage report. */
    findWindowLimits(report: UsageReport, context?: CredentialRankingContext): {
        primary?: UsageLimit;
        secondary?: UsageLimit;
    };
    /**
     * Restrict limits to the ones relevant for the requested model before
     * credential-wide exhaustion checks and ranking. Providers with shared
     * account-wide quotas can omit this and use all limits.
     */
    scopeLimits?(report: UsageReport, context?: CredentialRankingContext): UsageLimit[];
    /**
     * Return a provider-local backoff scope for the requested model. Providers
     * with backend-specific quotas use this so one exhausted model family does
     * not block unrelated families on the same OAuth credential.
     */
    blockScope?(context?: CredentialRankingContext): string | undefined;
    /** Fallback window durations (ms) when limits don't specify durationMs. */
    windowDefaults: {
        primaryMs: number;
        secondaryMs: number;
    };
    /** Optional: priority boost for specific credential states (e.g., fresh 5h ticker start). */
    hasPriorityBoost?(primary: UsageLimit | undefined): boolean;
}