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// Copyright 2025 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/.
//
// SPDX-License-Identifier: MPL-2.0

const CompileVala = @This();

const std = @import("std");

step: *std.Build.Step,
compiled_c_directory: std.Build.LazyPath,
compiled_c_files: []std.Build.LazyPath,

valac: *std.Build.Step.Run,

pub const Options = struct {
    /// This must be an existing path.
    src: std.Build.LazyPath,

    includeTestFiles: bool = false,
    includeMainVala: bool = true,
    suppressDeprecationWarning: bool = false,
};

pub fn init(b: *std.Build, opts: Options) !CompileVala {
    const valac = b.addSystemCommand(&.{"valac"});

    // Vala source codes to compile.
    const vala_sources: [][]const u8 = vala_sources: {
        var list: std.ArrayList([]const u8) = .empty;

        var dir = try opts.src.getPath3(b, &valac.step).openDir("", .{ .iterate = true });
        defer dir.close();

        var walker = try dir.walk(b.allocator);
        defer walker.deinit();

        while (try walker.next()) |entry| {
            const ext = std.fs.path.extension(entry.basename);
            if (std.mem.eql(u8, ".vala", ext)) {
                if (!opts.includeMainVala and std.mem.eql(u8, entry.basename, "main.vala")) {
                    continue;
                }

                if (!opts.includeTestFiles and std.mem.endsWith(u8, entry.basename, ".test.vala")) {
                    continue;
                }

                try list.append(b.allocator, b.dupe(entry.path));
            }
        }

        break :vala_sources try list.toOwnedSlice(b.allocator);
    };

    // Tell Vala compiler to emit C rather than compile using system C compiler.
    valac.addArg("--ccode");

    if (opts.suppressDeprecationWarning) {
        valac.addArg("--enable-deprecated");
    }

    // Tell Vala to emit C source files under the output directory.
    // The directory usually is Zig cache directory (like ".zig-cache/o/xxx").
    // For example, when there is "src/Foo.vala", this step produces
    // ".zig-cache/o/hash-or-something-idk/vala/Foo.c"
    valac.addArg("--directory");
    const dir = valac.addOutputDirectoryArg("vala");

    // Let valac emit C source code without prefixing using directory.
    valac.addArg("--basedir");
    valac.addDirectoryArg(opts.src);

    // Vala compiler takes a list of Vala source files, then process them all.
    for (vala_sources) |src| {
        valac.addFileArg(try opts.src.join(b.allocator, src));
    }

    const t = b.addInstallDirectory(.{
        .source_dir = dir,
        .install_dir = .{ .custom = "src" },
        .install_subdir = "",
    });

    const compiled_c_files = try b.allocator.alloc(std.Build.LazyPath, vala_sources.len);
    for (vala_sources, 0..) |src, i| {
        // Looks fragile but it works. Even if it produced incorrect paths,
        // filesystem and Zig compiler will tell us a file is missing.
        const rel_path = b.fmt("{s}.c", .{src[0..(src.len - 5)]});

        // src = "src/Foo.vala"
        // rel_path = "Foo.c"
        // file = "(step cache directory)/vala/Foo.c"
        compiled_c_files[i] = try dir.join(b.allocator, rel_path);
    }

    return .{
        .step = &t.step,
        .compiled_c_directory = dir,
        .compiled_c_files = compiled_c_files,
        .valac = valac,
    };
}

pub fn addPackage(self: *CompileVala, pkg: []const u8) void {
    self.valac.addArg("--pkg");
    self.valac.addArg(pkg);
}

pub fn addPackages(self: *CompileVala, pkgs: []const []const u8) void {
    for (pkgs) |pkg| {
        self.addPackage(pkg);
    }
}

pub fn addVapi(self: *CompileVala, file: std.Build.LazyPath) void {
    self.valac.addArg("--vapidir");
    self.valac.addDirectoryArg(file.dirname());
    self.valac.addFileInput(file);
}

pub fn addGResourceXML(self: *CompileVala, path: std.Build.LazyPath) void {
    self.valac.addArg("--gresources");
    self.valac.addFileArg(path);
}

pub fn getCompiledCDirectory(self: CompileVala) std.Build.LazyPath {
    return self.compiled_c_directory;
}

pub fn getCompiledCFiles(self: CompileVala) []std.Build.LazyPath {
    return self.compiled_c_files;
}