const c = @cImport({
    @cInclude("stdio.h");
    @cInclude("stdlib.h");
    @cInclude("sys/stat.h");
    @cInclude("string.h");
    @cInclude("time.h");
});

const std = @import("std");
const warn = std.debug.warn;
const allocator = std.heap.c_allocator;

fn alloc_str(size: c_ulong) [*c]u8 {
    return @ptrCast([*c]u8, @alignCast(@alignOf(u8), c.malloc(c_ulong(size))));
}

export fn journal_open(topic: [*c]u8) [*c](c.FILE) {
    var home_path: [*c]const u8 = c.getenv(c"HOME");

    var journal_dir: [*c]u8 = alloc_str(512);
    var journal_path: [*c]u8 = alloc_str(1024);

    _ = c.snprintf(journal_dir, c_ulong(512), c"%s/.lunabot", home_path);

    warn("uwu journal_dir = '{}'", journal_dir.*);

    //c.mkdir(journal_dir, c.S_IRWXU | c.S_IRGRP | c.S_IROTH);

    // taken off `zig translate-c`. this is cursed, i'm sorry.
    _ = c.mkdir(journal_dir, c.__mode_t((((256 | 128) | 64) | (256 >> @import("std").math.Log2Int(c_int)(3))) | ((256 >> @import("std").math.Log2Int(c_int)(3)) >> @import("std").math.Log2Int(c_int)(3))));

    _ = c.snprintf(journal_path, c_ulong(1024), c"%s/%s", journal_dir, topic);

    warn("journal_path = {}", journal_path.*);

    var res: [*c](c.FILE) = c.fopen(journal_path, c"a");

    c.free(@ptrCast(?*c_void, journal_path));
    c.free(@ptrCast(?*c_void, journal_dir));

    return res;
}

export fn journal_write(journal: [*c]c.FILE, message: [*c]u8) void {
    _ = c.fwrite(message, c.strlen(message), 1, journal);
}

export fn journal_close(journal: [*c]c.FILE) void {
    _ = c.fclose(journal);
}

export fn journal_write_topic(journal: *c.FILE, topic: [*c]u8, message: [*c]u8) void {
    var tstamp: [*c]u8 = alloc_str(128);
    var fmt_msg: [*c]u8 = alloc_str(128);
    var rawtime: c.time_t = undefined;

    _ = c.time(&rawtime);
    var cur_time: [*c]const c.struct_tm = c.gmtime(&rawtime);

    _ = c.strftime(tstamp, usize(128), c"%c", cur_time);
    _ = c.sprintf(fmt_msg, c"[%s] [%s]: %s\n", tstamp, topic, message);

    c.free(@ptrCast(?*c_void, tstamp));

    journal_write(journal, fmt_msg);
}