const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});
    const root_source_file = b.path("src/libfn/libfn.zig");

    // Build zig module.
    const libfn = b.addModule("libfn", .{
        .root_source_file = root_source_file,
        .target = target,
        .optimize = optimize,
    });

    // Tests.
    const libfn_unit_tests = b.addTest(.{
        .root_module = libfn,
    });
    const run_libfn_unit_tests = b.addRunArtifact(libfn_unit_tests);
    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&run_libfn_unit_tests.step);

    // Docs.
    // Check step for ZLS build-on-save.
    const libfn_for_docs = b.addLibrary(.{
        .name = "libfn",
        .root_module = libfn,
        .linkage = .static,
    });
    const check_step = b.step("check", "Run checks");
    check_step.dependOn(&libfn_for_docs.step);

    const install_docs = b.addInstallDirectory(.{
        .source_dir = libfn_for_docs.getEmittedDocs(),
        .install_dir = .prefix,
        .install_subdir = "docs",
    });
    const docs = b.step("docs", "Build libfn library docs");
    docs.dependOn(&install_docs.step);

    // Start of TUI declaration.
    const vxim = b.lazyDependency("vxim", .{ .target = target, .optimize = optimize });
    const ltf = b.lazyDependency("log_to_file", .{ .target = target, .optimize = optimize });

    if (vxim) |vxim_dep| {
        if (ltf) |ltf_dep| {
            const exe_mod = b.createModule(.{
                .root_source_file = b.path("src/tui/main.zig"),
                .target = target,
                .optimize = optimize,
            });

            exe_mod.addImport("vxim", vxim_dep.module("vxim"));
            exe_mod.addImport("log_to_file", ltf_dep.module("log_to_file"));
            exe_mod.addImport("libfn", libfn);

            const exe = b.addExecutable(.{
                .name = "fn",
                .root_module = exe_mod,
            });

            // Run step.
            const run_cmd = b.addRunArtifact(exe);
            run_cmd.step.dependOn(b.getInstallStep());
            const run_step = b.step("run", "Run the app");
            run_step.dependOn(&run_cmd.step);
            if (b.args) |args| run_cmd.addArgs(args);

            // Build TUI.
            b.installArtifact(exe);
        }
    }
}