const std = @import("std");
pub const Environment = @import("env.zig");

pub const use_mimalloc = !Environment.isTest;

pub const default_allocator: std.mem.Allocator = if (!use_mimalloc)
    std.heap.c_allocator
else
    @import("./memory_allocator.zig").c_allocator;

pub const C = @import("c.zig");

pub const FeatureFlags = @import("feature_flags.zig");
const root = @import("root");
pub const meta = @import("./meta.zig");
pub const ComptimeStringMap = @import("./comptime_string_map.zig").ComptimeStringMap;

pub const fmt = struct {
    pub usingnamespace std.fmt;

    pub const SizeFormatter = struct {
        value: usize = 0,
        pub fn format(self: SizeFormatter, comptime _: []const u8, _: fmt.FormatOptions, writer: anytype) !void {
            const math = std.math;
            const value = self.value;
            if (value == 0) {
                return writer.writeAll("0 KB");
            }

            const mags_si = " KMGTPEZY";
            const mags_iec = " KMGTPEZY";

            const log2 = math.log2(value);
            const magnitude = math.min(log2 / comptime math.log2(1000), mags_si.len - 1);
            const new_value = math.lossyCast(f64, value) / math.pow(f64, 1000, math.lossyCast(f64, magnitude));
            const suffix = switch (1000) {
                1000 => mags_si[magnitude],
                1024 => mags_iec[magnitude],
                else => unreachable,
            };

            if (suffix == ' ') {
                try fmt.formatFloatDecimal(new_value / 1000.0, .{ .precision = 2 }, writer);
                return writer.writeAll(" KB");
            } else {
                try fmt.formatFloatDecimal(new_value, .{ .precision = if (std.math.approxEqAbs(f64, new_value, @trunc(new_value), 0.100)) @as(usize, 0) else @as(usize, 2) }, writer);
            }

            const buf = switch (1000) {
                1000 => &[_]u8{ ' ', suffix, 'B' },
                1024 => &[_]u8{ ' ', suffix, 'i', 'B' },
                else => unreachable,
            };
            return writer.writeAll(buf);
        }
    };

    pub fn size(value: anytype) SizeFormatter {
        return switch (@TypeOf(value)) {
            f64, f32, f128 => SizeFormatter{
                .value = @floatToInt(u64, value),
            },
            else => SizeFormatter{ .value = @intCast(u64, value) },
        };
    }
};

pub const Output = @import("./output.zig");
pub const Global = @import("./__global.zig");

pub const FileDescriptorType = if (Environment.isBrowser) u0 else std.os.fd_t;

// When we are on a computer with an absurdly high number of max open file handles
// such is often the case with macOS
// As a useful optimization, we can store file descriptors and just keep them open...forever
pub const StoredFileDescriptorType = if (Environment.isWindows or Environment.isBrowser) u0 else std.os.fd_t;

pub const StringTypes = @import("string_types.zig");
pub const stringZ = StringTypes.stringZ;
pub const string = StringTypes.string;
pub const CodePoint = StringTypes.CodePoint;
pub const PathString = StringTypes.PathString;
pub const HashedString = StringTypes.HashedString;
pub const strings = @import("string_immutable.zig");
pub const MutableString = @import("string_mutable.zig").MutableString;
pub const RefCount = @import("./ref_count.zig").RefCount;

pub inline fn constStrToU8(s: []const u8) []u8 {
    return @intToPtr([*]u8, @ptrToInt(s.ptr))[0..s.len];
}

pub const MAX_PATH_BYTES: usize = if (Environment.isWasm) 1024 else std.fs.MAX_PATH_BYTES;

pub inline fn cast(comptime To: type, value: anytype) To {
    return @ptrCast(To, @alignCast(@alignOf(To), value));
}