const std = @import("std");

// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) void {
    // Standard target options allows the person running `zig build` to choose
    // what target to build for. Here we do not override the defaults, which
    // means any target is allowed, and the default is native. Other options
    // for restricting supported target set are available.
    const target = b.standardTargetOptions(.{});

    // Standard optimization options allow the person running `zig build` to select
    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
    // set a preferred release mode, allowing the user to decide how to optimize.
    const optimize = b.standardOptimizeOption(.{});

    const zg = b.dependency("zg", .{
        .target = target,
        .optimize = optimize,
    });
    const interface = b.dependency("interface", .{
        .target = target,
        .optimize = optimize,
    });

    const lib = b.addModule("zterm", .{
        .root_source_file = b.path("src/zterm.zig"),
        .target = target,
        .optimize = optimize,
    });
    lib.addImport("interface", interface.module("interface"));
    lib.addImport("code_point", zg.module("code_point"));

    // example executables
    const stack_example = b.addExecutable(.{
        .name = "stack",
        .root_source_file = b.path("examples/stack.zig"),
        .target = target,
        .optimize = optimize,
    });
    stack_example.root_module.addImport("zterm", lib);

    const container_example = b.addExecutable(.{
        .name = "container",
        .root_source_file = b.path("examples/container.zig"),
        .target = target,
        .optimize = optimize,
    });
    container_example.root_module.addImport("zterm", lib);

    const padding_example = b.addExecutable(.{
        .name = "padding",
        .root_source_file = b.path("examples/padding.zig"),
        .target = target,
        .optimize = optimize,
    });
    padding_example.root_module.addImport("zterm", lib);

    const exec_example = b.addExecutable(.{
        .name = "exec",
        .root_source_file = b.path("examples/exec.zig"),
        .target = target,
        .optimize = optimize,
    });
    exec_example.root_module.addImport("zterm", lib);

    const tui_example = b.addExecutable(.{
        .name = "tui",
        .root_source_file = b.path("examples/tui.zig"),
        .target = target,
        .optimize = optimize,
    });
    tui_example.root_module.addImport("zterm", lib);

    // This declares intent for the executable to be installed into the
    // standard location when the user invokes the "install" step (the default
    // step when running `zig build`).
    b.installArtifact(stack_example);
    b.installArtifact(container_example);
    b.installArtifact(padding_example);
    b.installArtifact(exec_example);
    b.installArtifact(tui_example);

    const exe_check = b.addExecutable(.{
        .name = "check",
        .root_source_file = b.path("src/zterm.zig"),
        .target = target,
        .optimize = optimize,
    });

    const check = b.step("check", "Check if project compiles");
    check.dependOn(&exe_check.step);

    // Creates a step for unit testing. This only builds the test executable
    // but does not run it.
    const lib_unit_tests = b.addTest(.{
        .root_source_file = b.path("src/zterm.zig"),
        .target = target,
        .optimize = optimize,
    });
    lib_unit_tests.root_module.addImport("zg", zg.module("code_point"));

    const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);

    // Similar to creating the run step earlier, this exposes a `test` step to
    // the `zig build --help` menu, providing a way for the user to request
    // running the unit tests.
    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&run_lib_unit_tests.step);
}