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// SPDX-License-Identifier: AGPL-3.0-only
// Copyright 2026 Shota FUJI
//
// This program is free software: you can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
// PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License along
// with this program.  If not, see <http://www.gnu.org/licenses/>.

const std = @import("std");

pub fn build(b: *std.Build) !void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});

    // Default install
    {
        const wasm = b.addExecutable(.{
            .name = "yamori_default_auth",
            .root_module = createMainModule(
                b,
                b.resolveTargetQuery(.{ .cpu_arch = .wasm32, .os_tag = .freestanding }),
                optimize,
            ),
        });

        wasm.entry = .disabled;

        b.installArtifact(wasm);
    }

    // "zig build test"
    {
        const t = b.addTest(.{
            .name = "yamori_default_auth_test",
            .root_module = createMainModule(b, target, optimize),
        });

        const run = b.addRunArtifact(t);

        const step = b.step("test", "Run unit tests");
        step.dependOn(&run.step);
    }
}

fn createMainModule(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.builtin.OptimizeMode) *std.Build.Module {
    const flatbuffers = b.dependency("flatbuffers", .{});

    const bfbs = bfbs: {
        const flatc = b.addSystemCommand(&.{
            "flatc", "-b", "--schema", "--bfbs-comments", "--bfbs-builtins",
        });

        flatc.addArg("-o");
        const dir = flatc.addOutputDirectoryArg("out");

        flatc.addFileArg(b.path("v1.fbs"));

        break :bfbs dir.path(b, "v1.bfbs");
    };

    const binding = binding: {
        const parser = b.addExecutable(.{
            .name = "zfbs-parse",
            .root_module = flatbuffers.module("parse"),
        });

        const parse = b.addRunArtifact(parser);
        parse.addFileArg(bfbs);
        const zon = parse.captureStdOut(.{ .basename = "v1.zon" });

        const generator = b.addExecutable(.{
            .name = "zfbs-generate",
            .root_module = flatbuffers.module("generate"),
        });

        const generate = b.addRunArtifact(generator);
        generate.addFileArg(zon);
        const source = generate.captureStdOut(.{ .basename = "v1.zig" });

        const dir = b.addWriteFiles();
        _ = dir.addCopyFile(zon, "v1.zon");
        const root = dir.addCopyFile(source, "v1.zig");

        break :binding b.createModule(.{
            .root_source_file = root,
            .imports = &.{.{ .name = "flatbuffers", .module = flatbuffers.module("flatbuffers") }},
        });
    };

    const mod = b.createModule(.{
        .root_source_file = b.path("default_auth.zig"),
        .optimize = optimize,
        .target = target,
    });

    mod.export_symbol_names = &.{"v1_allow_resource_access"};

    mod.addImport("flatbuffers", flatbuffers.module("flatbuffers"));
    mod.addImport("v1", binding);

    return mod;
}