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// Copyright 2025 Shota FUJI
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

//! This file defines how `zig build` command behaves.
//! Run `zig build --help` for available subcommands and options.
//!
//! Learn more at
//! https://ziglang.org/learn/build-system/

const std = @import("std");

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

    const sood = sood: {
        const dep = b.dependency("sood", .{});

        break :sood dep.module("sood");
    };

    const moo = moo: {
        const dep = b.dependency("libmoo", .{});

        break :moo dep.module("moo");
    };

    const websocket = websocket: {
        const dep = b.dependency("websocket", .{});

        break :websocket dep.module("websocket");
    };

    // Static library for GLib
    {
        const linkage = b.option(
            std.builtin.LinkMode,
            "linkage",
            "Link mode of the generated library file",
        ) orelse .static;

        const lib = b.addLibrary(.{
            .name = "plac_glib",
            .linkage = linkage,
            .root_module = b.createModule(.{
                .root_source_file = b.path("src/main.glib.zig"),
                .target = target,
                // FIXME: Debug build on macOS crashes on WebSocket client creation for some reason.
                .optimize = if (optimize == .Debug and target.result.os.tag.isDarwin()) .ReleaseSafe else optimize,
            }),
        });

        lib.root_module.addImport("sood", sood);
        lib.root_module.addImport("moo", moo);
        lib.root_module.addImport("websocket", websocket);

        lib.linkLibC();
        lib.linkSystemLibrary2("glib-2.0", .{ .preferred_link_mode = .dynamic });
        lib.installHeader(b.path("src/plac.h"), "plac.h");
        lib.installHeader(b.path("src/plac.vapi"), "plac.vapi");

        b.installArtifact(lib);

        const artifact = b.addInstallArtifact(lib, .{});

        const step = b.step("glib", "Build library for GLib application");
        step.dependOn(&artifact.step);

        b.default_step.dependOn(step);
    }

    // XCFramework
    // https://mitchellh.com/writing/zig-and-swiftui
    if (target.result.os.tag.isDarwin()) {
        const arm = b.addLibrary(.{
            .name = "plac_apple_arm",
            .linkage = .static,
            .root_module = b.createModule(.{
                .root_source_file = b.path("src/main.apple.zig"),
                .target = b.resolveTargetQuery(.{
                    .os_tag = .macos,
                    .cpu_arch = .aarch64,
                }),
                .optimize = optimize,
            }),
        });

        // While I could have dedicated unit just for copying, this is simpler and easier.
        arm.installHeader(b.path("src/plac.h"), "plac.h");
        arm.installHeader(b.path("src/plac.modulemap"), "module.modulemap");

        const intel = b.addLibrary(.{
            .name = "plac_apple_intel",
            .linkage = .static,
            .root_module = b.createModule(.{
                .root_source_file = b.path("src/main.apple.zig"),
                .target = b.resolveTargetQuery(.{
                    .os_tag = .macos,
                    .cpu_arch = .x86_64,
                }),
                .optimize = optimize,
            }),
        });

        inline for (.{ arm, intel }) |compile| {
            compile.linkLibC();

            // Without bundling those, XCode is unable to resolve symbols.
            compile.bundle_compiler_rt = true;
            compile.bundle_ubsan_rt = true;

            compile.root_module.addImport("sood", sood);
            compile.root_module.addImport("moo", moo);
            compile.root_module.addImport("websocket", websocket);
        }

        const universal_lib = universal: {
            const lipo = b.addSystemCommand(&.{"lipo"});

            lipo.addArg("-create");

            lipo.addArg("-output");
            const output = lipo.addOutputFileArg("libplac.a");

            lipo.addFileArg(arm.getEmittedBin());
            lipo.addFileArg(intel.getEmittedBin());

            break :universal output;
        };

        const xcframework = xcframework: {
            const xcodebuild = b.addSystemCommand(&.{"xcodebuild"});

            xcodebuild.addArg("-create-xcframework");

            xcodebuild.addArg("-library");
            xcodebuild.addFileArg(universal_lib);

            xcodebuild.addArg("-headers");
            xcodebuild.addDirectoryArg(arm.getEmittedIncludeTree());

            xcodebuild.addArg("-output");
            break :xcframework xcodebuild.addOutputDirectoryArg("PlacCore.xcframework");
        };

        const step = b.step("apple", "Build xcframework file for Apple platforms");
        step.dependOn(&b.addInstallDirectory(.{
            .source_dir = xcframework,
            .install_dir = .{ .custom = "xcframeworks" },
            .install_subdir = "PlacCore.xcframework",
        }).step);

        b.default_step.dependOn(step);
    }
}