const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});

    // External dependencies
    const srf_dep = b.dependency("srf", .{
        .target = target,
        .optimize = optimize,
    });

    const vaxis_dep = b.dependency("vaxis", .{
        .target = target,
        .optimize = optimize,
    });

    // Library module -- the public API for consumers of zfin
    const mod = b.addModule("zfin", .{
        .root_source_file = b.path("src/root.zig"),
        .target = target,
        .imports = &.{
            .{ .name = "srf", .module = srf_dep.module("srf") },
        },
    });

    // TUI module (imported by the unified binary)
    const tui_mod = b.addModule("tui", .{
        .root_source_file = b.path("src/tui/main.zig"),
        .target = target,
        .imports = &.{
            .{ .name = "zfin", .module = mod },
            .{ .name = "srf", .module = srf_dep.module("srf") },
            .{ .name = "vaxis", .module = vaxis_dep.module("vaxis") },
        },
    });

    // Unified executable (CLI + TUI in one binary)
    const exe = b.addExecutable(.{
        .name = "zfin",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/cli/main.zig"),
            .target = target,
            .optimize = optimize,
            .imports = &.{
                .{ .name = "zfin", .module = mod },
                .{ .name = "srf", .module = srf_dep.module("srf") },
                .{ .name = "tui", .module = tui_mod },
            },
        }),
    });
    b.installArtifact(exe);

    // Run step: `zig build run -- <args>`
    const run_step = b.step("run", "Run the zfin CLI");
    const run_cmd = b.addRunArtifact(exe);
    run_step.dependOn(&run_cmd.step);
    run_cmd.step.dependOn(b.getInstallStep());
    if (b.args) |args| {
        run_cmd.addArgs(args);
    }

    // Tests
    const test_step = b.step("test", "Run all tests");

    const mod_tests = b.addTest(.{ .root_module = mod });
    test_step.dependOn(&b.addRunArtifact(mod_tests).step);

    const exe_tests = b.addTest(.{ .root_module = exe.root_module });
    test_step.dependOn(&b.addRunArtifact(exe_tests).step);

    const tui_tests = b.addTest(.{ .root_module = b.createModule(.{
        .root_source_file = b.path("src/tui/main.zig"),
        .target = target,
        .optimize = optimize,
        .imports = &.{
            .{ .name = "zfin", .module = mod },
            .{ .name = "srf", .module = srf_dep.module("srf") },
            .{ .name = "vaxis", .module = vaxis_dep.module("vaxis") },
        },
    }) });
    test_step.dependOn(&b.addRunArtifact(tui_tests).step);

    // Docs
    const lib = b.addLibrary(.{
        .name = "zfin",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/root.zig"),
            .target = target,
            .optimize = optimize,
            .imports = &.{
                .{ .name = "srf", .module = srf_dep.module("srf") },
            },
        }),
    });
    const docs_step = b.step("docs", "Generate documentation");
    docs_step.dependOn(&b.addInstallDirectory(.{
        .source_dir = lib.getEmittedDocs(),
        .install_dir = .prefix,
        .install_subdir = "docs",
    }).step);
}