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// SPDX-License-Identifier: MPL-2.0
// Copyright 2026 Shota FUJI
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

const builtin = @import("builtin");
const std = @import("std");

const pages: []const []const u8 = @import("./pages.zon");

pub fn build(b: *std.Build) !void {
    const pandoc_exe = pandoc_exe: {
        const dep = if (builtin.os.tag == .linux and builtin.cpu.arch == .x86_64)
            b.lazyDependency("pandoc_linux_amd64", .{}) orelse return
        else {
            @panic("このホスト用の pandoc が用意できません。 build.zig.zon と build.zig を編集してホストを追加してください。");
        };

        break :pandoc_exe dep.path("bin/pandoc");
    };

    const dist = dist: {
        const dir = b.addWriteFiles();

        for (pages) |page| {
            if (!std.mem.startsWith(u8, page, "src/")) {
                @panic(b.fmt("ページファイルは src/ 配下に置いてください: {s}", .{page}));
            }

            const ext = std.fs.path.extension(page);

            const format = format: {
                if (std.mem.eql(u8, ext, ".md")) {
                    break :format "gfm";
                }

                if (std.mem.eql(u8, ext, ".adoc")) {
                    break :format "asciidoc";
                }

                @panic(b.fmt("{s} ファイルは読み込めません: {s}", .{ ext, page }));
            };

            const pandoc = std.Build.Step.Run.create(b, "pandoc");
            pandoc.addFileArg(pandoc_exe);

            pandoc.addArgs(&.{ "--from", format });
            pandoc.addArg("--to=html");

            pandoc.addArg("--standalone");

            pandoc.addFileArg(b.path(page));

            const output = pandoc.addPrefixedOutputFileArg("--output=", "out.html");

            _ = dir.addCopyFile(output, b.fmt("{s}.html", .{page["src/".len .. page.len - ext.len]}));
        }

        _ = dir.addCopyDirectory(b.path("src/internal-api"), "internal-api", .{});

        break :dist dir;
    };

    // デフォルトインストール
    {
        const install = b.addInstallDirectory(.{
            .source_dir = dist.getDirectory(),
            .install_dir = .{ .custom = "" },
            .install_subdir = "",
        });

        b.default_step.dependOn(&install.step);
    }
}