const std = @import("std");
const log = std.log.scoped(.htzx_comp);

pub fn build_htzx(b: *std.Build, exe: *std.Build.Step.Compile) !void {
    // Setup comptime parsing for /lib files
    var markup_files = std.ArrayList([]const u8).init(b.allocator);
    // var zig_files = std.ArrayList([]const u8).init(b.allocator);
    defer markup_files.deinit();
    // defer zig_files.deinit();

    var options = b.addOptions();

    // Add all files names in the src folder to `files`
    // var iter_dir = try std.fs.cwd().openIterableDir("lib", .{});
    const lib_dir_path = "src/lib/";
    var lib_dir = try std.fs.cwd().openIterableDir(lib_dir_path, .{});
    var lib_walker = try lib_dir.walk(b.allocator);
    var walking = true;
    while (walking) blk: {
        var file = lib_walker.next() catch {
            walking = false;
            break :blk;
        };
        if (file == null) {
            walking = false;
            break :blk;
        }
        if (file.?.kind == .file) {
            const relative_path = file.?.path;
            const file_path = try std.mem.concat(b.allocator, u8, &[_][]const u8{lib_dir_path, relative_path});
            var split_iter = std.mem.splitBackwardsAny(u8, relative_path, ".");
            var extension = split_iter.first();
            // if (std.mem.eql(u8, extension, "zig")) {
            //     std.debug.print("Adding zig file {s}...\n", .{path});
            //     try zig_files.append(b.dupe(path));
            //     var arr: [50]u8 = undefined;
            //     var buf = arr[0..];
            //     var z_file_path = try std.fmt.bufPrint(buf, "lib/{s}", .{path});
            //     var z_file = try std.fs.cwd().openFile(z_file_path, .{});
            //     const zig_contents = try z_file.readToEndAlloc(b.allocator, 64000);
            //     const index = std.mem.indexOf(u8, zig_contents, "pub fn post");
            //     if (index) |i| {
            //         std.debug.print("Found post endpoint in {s}\n", .{z_file_path});
            //         var routes_file = try src_dir.createFile("routes.zig", .{});
            //         _ = try routes_file.write(zig_contents[i..]);
            //         std.debug.print("Wrote {s}... to routes.zig\n", .{zig_contents[0..10]});
            //     }
            // } else
            if (std.mem.eql(u8, extension, "html")) {
                log.info("Adding html file {s}...", .{file_path});
                try markup_files.append(b.dupe(file_path));
            } else {
               log.info("Unrecognized file extension '.{s}'\t{s}", .{ extension, file_path });
            }
        }
        // std.debug.print("Got entry in `versions:` base: {s}, path: {s}, kind: {any}\n", .{ ver.?.basename, ver.?.path, ver.?.kind });
    }

    // Add the file names as an option to the exe, making it available
    // as a string array at comptime in main.zig
    // options.addOption([]const []const u8, "zig_files", zig_files.items);
    options.addOption([]const []const u8, "markup_files", markup_files.items);
    exe.addOptions("options", options);
}