//! Google Antigravity usage feed implementation.
//!
//! Mirrors prime-agent:packages/ai/src/utils/usage/providers/antigravity.ts field for field.
const std = @import("std");
const usage = @import("../usage.zig");
const iso8601 = @import("../iso8601.zig");
pub const ANTIGRAVITY_USAGE_URL = "https://daily-cloudcode-pa.googleapis.com/v1internal:retrieveUserQuota";
pub const ANTIGRAVITY_USER_AGENT = "antigravity/hub/2.8.0 (aidev_client; os_type=darwin; arch=arm64; cl=963137146)";
const FamilyInfo = struct {
min_remaining: ?f64 = null,
reset_time: ?[]const u8 = null,
present: bool = false,
};
fn modelFamily(alloc: std.mem.Allocator, model_id: []const u8) !?[]const u8 {
const lower = try alloc.alloc(u8, model_id.len);
_ = std.ascii.lowerString(lower, model_id);
if (std.mem.startsWith(u8, lower, "chat_") or std.mem.startsWith(u8, lower, "tab_")) {
return null;
}
if (std.mem.indexOf(u8, lower, "gemini") != null) return "Gemini";
if (std.mem.indexOf(u8, lower, "claude") != null) return "Claude";
if (std.mem.indexOf(u8, lower, "gpt") != null) return "GPT-OSS";
return null;
}
pub fn parseAntigravityUsage(alloc: std.mem.Allocator, payload: ?std.json.Value, now_ms: i64) ![]const usage.UsageLimit {
_ = now_ms;
const root = usage.asObject(payload);
const buckets = if (root) |r| usage.asArray(r.get("buckets")) else null;
var gemini = FamilyInfo{};
var claude = FamilyInfo{};
var gpt = FamilyInfo{};
if (buckets) |arr| {
for (arr.items) |entry| {
const bucket = usage.asObject(entry) orelse continue;
const model_id = usage.asString(bucket.get("modelId")) orelse "";
const family = try modelFamily(alloc, model_id) orelse continue;
const remaining_fraction = usage.asNumber(bucket.get("remainingFraction"));
const reset_time = usage.asString(bucket.get("resetTime"));
const target: *FamilyInfo = if (std.mem.eql(u8, family, "Gemini"))
&gemini
else if (std.mem.eql(u8, family, "Claude"))
&claude
else
&gpt;
if (!target.present) {
target.present = true;
target.min_remaining = remaining_fraction;
target.reset_time = reset_time;
} else {
if (remaining_fraction != null and (target.min_remaining == null or remaining_fraction.? < target.min_remaining.?)) {
target.min_remaining = remaining_fraction;
target.reset_time = reset_time;
} else if (target.reset_time == null and reset_time != null) {
target.reset_time = reset_time;
}
}
}
}
var limits = std.ArrayList(usage.UsageLimit).empty;
const families = [_]struct { id: []const u8, label: []const u8, info: *const FamilyInfo }{
.{ .id = "gemini", .label = "Gemini", .info = &gemini },
.{ .id = "claude", .label = "Claude", .info = &claude },
.{ .id = "gpt-oss", .label = "GPT-OSS", .info = &gpt },
};
for (families) |f| {
if (!f.info.present) continue;
const rem = f.info.min_remaining;
const used_percent: ?f64 = if (rem) |r|
@max(0.0, @min(100.0, @round((1.0 - r) * 1000.0) / 10.0))
else
null;
const resets_at: ?i64 = if (f.info.reset_time) |rt| iso8601.parseIso8601(rt) else null;
// The feed states when a family resets, never how long its window is, so there is
// no honest label: `epochToWindowLabel` would print the time left, which reads as
// "3h window" and then "1h window" for one fixed five-hour window.
const detail: ?[]const u8 = if (rem) |r| blk: {
const free_pct = usage.roundToInt(i64, r * 100.0) orelse break :blk null;
break :blk try std.fmt.allocPrint(alloc, "{d}% free", .{free_pct});
} else null;
const status = if (used_percent) |up| usage.statusFor(up) else "unknown";
// Each family's buckets are its own quota, so the family is also the scope.
try limits.append(alloc, .{
.id = f.id,
.label = f.label,
.usedPercent = used_percent,
.resetsAt = resets_at,
.scope = f.label,
.detail = detail,
.status = status,
});
}
return limits.items;
}
pub fn advance(
alloc: std.mem.Allocator,
credential_json: []const u8,
responses_json: []const u8,
now_ms: i64,
) !usage.Outcome {
const cred_parsed = std.json.parseFromSlice(std.json.Value, alloc, credential_json, .{}) catch {
return .{ .report = .{ .error_message = "invalid credential JSON" } };
};
const cred_root = usage.asObject(cred_parsed.value) orelse {
return .{ .report = .{ .error_message = "invalid credential JSON" } };
};
const kind = usage.asString(cred_root.get("kind")) orelse "";
if (!std.mem.eql(u8, kind, "oauth")) {
return .{ .report = .{ .error_message = "google-antigravity needs an OAuth account" } };
}
const access = usage.asString(cred_root.get("access")) orelse "";
const extra_obj = usage.asObject(cred_root.get("extra"));
const project_id = if (extra_obj) |eo| usage.asString(eo.get("projectId")) else null;
const cred_account_id = usage.asString(cred_root.get("accountId"));
const account_id = cred_account_id orelse project_id;
const email = usage.asString(cred_root.get("email"));
const resp_parsed = std.json.parseFromSlice(std.json.Value, alloc, responses_json, .{}) catch {
return .{ .report = .{ .error_message = "invalid responses JSON" } };
};
const resp_array = usage.asArray(resp_parsed.value) orelse {
return .{ .report = .{ .error_message = "invalid responses JSON" } };
};
if (resp_array.items.len == 0) {
var headers = std.ArrayList([2][]const u8).empty;
const auth_hdr = try std.fmt.allocPrint(alloc, "Bearer {s}", .{access});
try headers.append(alloc, .{ "Authorization", auth_hdr });
try headers.append(alloc, .{ "Content-Type", "application/json" });
try headers.append(alloc, .{ "User-Agent", ANTIGRAVITY_USER_AGENT });
const requests = try alloc.alloc(usage.UsageRequest, 1);
requests[0] = .{
.method = "POST",
.url = ANTIGRAVITY_USAGE_URL,
.headers = headers.items,
.body = "{}",
};
return .{ .requests = requests };
}
const first = switch (try usage.parseFirstResponseEx(alloc, resp_array, "usage body is not JSON", true)) {
.ok => |f| f,
.err => |msg| return .{ .report = .{ .error_message = msg } },
};
const body_parsed = first.parsed;
const limits = try parseAntigravityUsage(alloc, body_parsed.value, now_ms);
const notes: []const []const u8 = if (project_id) |pid| blk: {
const arr = try alloc.alloc([]const u8, 1);
arr[0] = try std.fmt.allocPrint(alloc, "Project: {s}", .{pid});
break :blk arr;
} else &[_][]const u8{};
return .{
.report = .{
.planType = "Cloud Code",
.accountId = account_id,
.email = email,
.limits = limits,
.notes = notes,
.error_message = null,
},
};
}