//! Thin HTTP GET helper over std.http.Client.

const std = @import("std");
const assert = std.debug.assert;

/// Largest response body we accept (the docs page is ~1 MB; allow generous slack).
pub const max_body = 32 * 1024 * 1024;

pub const Error = error{ HttpStatus, BodyTooLarge } || std.mem.Allocator.Error;

/// GET `url` and return the response body. Caller owns the returned slice.
/// Returns an error on any non-200 status so callers can skip that version.
pub fn get(allocator: std.mem.Allocator, client: *std.http.Client, url: []const u8) ![]u8 {
    assert(url.len > 0);

    var body: std.Io.Writer.Allocating = .init(allocator);
    defer body.deinit();

    const result = try client.fetch(.{
        .location = .{ .url = url },
        .response_writer = &body.writer,
    });

    if (result.status != .ok) return Error.HttpStatus;
    if (body.writer.end > max_body) return Error.BodyTooLarge;

    const out = try body.toOwnedSlice();
    assert(out.len > 0);
    return out;
}