const std = @import("std");
const ArrayList = std.ArrayList;

const c = @cImport({
    @cDefine("DEBUG", "1");
    @cInclude("stdio.h");
    @cInclude("cmph.h");
});

const tempMph = "temp.mph";

pub fn main() !void {

    //    var hash: ?*c.cmph_t = c.cmph_new(config);
    //    c.cmph_config_destroy(config);
    //    _ = c.cmph_dump(hash, mphf_fd);
    //    c.cmph_destroy(hash);
    //    _ = c.fclose(mphf_fd);
    //    mphf_fd = c.fopen("temp.mph", "r");
    //    hash = c.cmph_load(mphf_fd);
    //    while (i < nkeys) {
    //        var key: [*c]const u8 = vector[i];
    //        var id: c_uint = c.cmph_search(hash, key, @bitCast(c.cmph_uint32, @truncate(c_uint, 10)));
    //        try stdout.print("key:{s} -- hash:{u}\n", key, id);
    //        i +%= 1;
    //    }
    //    c.cmph_destroy(hash);
    //    c.cmph_io_vector_adapter_destroy(source);
    //    _ = c.fclose(mphf_fd);
    //    return 0;
    //}
}

test "simple cmph usage" {
    var arena_instance = std.heap.ArenaAllocator.init(std.heap.page_allocator);
    const arena = arena_instance.allocator();
    const stdout = std.io.getStdOut().writer();
    const stderr = std.io.getStdErr().writer();

    _ = stdout;
    var vector = ArrayList([*:0]const u8).init(arena);
    try vector.append("aaaaaaaaaa");
    try vector.append("bbbbbbbbbb");
    try vector.append("cccccccccc");
    try vector.append("dddddddddd");
    try vector.append("eeeeeeeeee");
    try vector.append("ffffffffff");
    try vector.append("gggggggggg");
    try vector.append("hhhhhhhhhh");
    try vector.append("iiiiiiiiii");
    try vector.append("jjjjjjjjjj");

    var mphf_fh = try std.fs.cwd().createFile(tempMph, .{});
    defer {
        std.fs.cwd().deleteFile(tempMph) catch |err| {
            stderr.print("error removing file: {s}\n", .{@errorName(err)}) catch {};
        };
    }
    var mphf_fd = c.fdopen(mphf_fh.handle, "w");
    var vector_len = @truncate(c_uint, vector.items.len);
    var cvector = @ptrCast([*c][*c]u8, vector.toOwnedSlice().ptr);
    var source = c.cmph_io_vector_adapter(cvector, vector_len);
    var config: *c.cmph_config_t = c.cmph_config_new(source) orelse return error.OutOfMemory;
    c.cmph_config_set_algo(config, c.CMPH_BRZ);
    c.cmph_config_set_mphf_fd(config, mphf_fd);
    var hash: *c.cmph_t = c.cmph_new(config) orelse return error.OutOfMemory;
    c.cmph_config_destroy(config);
    _ = c.cmph_dump(hash, mphf_fd);
    c.cmph_destroy(hash);
    mphf_fh.close();

    mphf_fh = try std.fs.cwd().openFile(tempMph, .{ .mode = .read_only });
    mphf_fd = c.fdopen(mphf_fh.handle, "r");
    defer mphf_fh.close();

    var got_hash: ?*c.cmph_t = c.cmph_load(mphf_fd);
    if (got_hash) |real_hash| {
        hash = real_hash;
    } else {
        try stderr.print("failed to unwrap hash\n", .{});
    }
}

const expectEqual = std.testing.expectEqual;

test "char**" {
    var arena_instance = std.heap.ArenaAllocator.init(std.heap.page_allocator);
    const arena = arena_instance.allocator();

    var arrl = ArrayList([*:0]const u8).init(arena);
    try arrl.append("foo");
    try arrl.append("bar");

    var arr: [*][*:0]const u8 = arrl.toOwnedSlice().ptr;

    try expectEqual(@TypeOf(arr[0]), [*:0]const u8);
    try expectEqual(arr[0][2], 'o');
    try expectEqual(arr[0][3], 0);
}