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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

const RoonMsg = @This();

const std = @import("std");

step: *std.Build.Step,
lib: *std.Build.Step.Compile,

/// Install formatted header and vapi files.
/// For debugging.
install_pretty_headers: *std.Build.Step,

pub const Options = struct {
    target: std.Build.ResolvedTarget,
    optimize: std.builtin.OptimizeMode,
};

pub fn init(b: *std.Build, opts: Options) RoonMsg {
    const lib = b.addLibrary(.{
        .name = "libroon",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/Roon/lib.zig"),
            .link_libc = true,
            .target = opts.target,
            .optimize = opts.optimize,
        }),
    });

    const spec_builder = b.addExecutable(.{
        .name = "build_api_spec",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/Roon/build_api_spec.zig"),
            .target = b.graph.host,
            .link_libc = true,
        }),
    });

    const build_spec = b.addRunArtifact(spec_builder);
    const spec_out = build_spec.addOutputFileArg("spec.json");

    const header_builder = b.addExecutable(.{
        .name = "build_header",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/Roon/build_c_header.zig"),
            .target = b.graph.host,
        }),
    });

    const build_header = b.addRunArtifact(header_builder);
    build_header.addFileArg(spec_out);
    const header_out = build_header.addOutputFileArg("roon.h");

    const vapi_builder = b.addExecutable(.{
        .name = "build_vapi",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/Roon/build_vapi.zig"),
            .target = b.graph.host,
        }),
    });

    const build_vapi = b.addRunArtifact(vapi_builder);
    build_vapi.addFileArg(spec_out);
    const vapi_out = build_vapi.addOutputFileArg("roon.vapi");

    lib.installHeader(header_out, "roon.h");
    lib.installHeader(vapi_out, "roon.vapi");

    const uncrustify_vala = b.addSystemCommand(&.{"uncrustify"});
    uncrustify_vala.addArg("-c");
    uncrustify_vala.addFileArg(b.path("uncrustify.cfg"));
    uncrustify_vala.addArgs(&.{ "-l", "VALA" });
    uncrustify_vala.setStdIn(.{ .lazy_path = vapi_out });
    // Uncrustify outputs to stderr anyways
    _ = uncrustify_vala.captureStdErr();
    const pretty_vapi = uncrustify_vala.captureStdOut();

    const uncrustify_c = b.addSystemCommand(&.{"uncrustify"});
    uncrustify_c.addArg("-c");
    uncrustify_c.addFileArg(b.path("uncrustify.cfg"));
    uncrustify_c.addArgs(&.{ "-l", "C" });
    uncrustify_c.setStdIn(.{ .lazy_path = header_out });
    // Uncrustify outputs to stderr anyways
    _ = uncrustify_c.captureStdErr();
    const pretty_header = uncrustify_c.captureStdOut();

    const install_pretty_header = b.addInstallHeaderFile(pretty_header, "roon.pretty.h");
    const install_pretty_vapi = b.addInstallHeaderFile(pretty_vapi, "roon.pretty.vapi");

    install_pretty_vapi.step.dependOn(&install_pretty_header.step);

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

    return .{
        .step = &install.step,
        .lib = lib,
        .install_pretty_headers = &install_pretty_vapi.step,
    };
}