const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});
    const exe = b.addExecutable(.{
        .name = "have",
        .root_module = b.createModule(.{
            .root_source_file = b.path("have.zig"),
            .target = target,
            .optimize = optimize,
            .link_libc = true,
        }),
    });
    b.installArtifact(exe);

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

    const tests = b.addTest(.{
        .root_module = exe.root_module,
    });
    const run_tests = b.addRunArtifact(tests);

    const smoke = b.addSystemCommand(&.{ "sh", "smoke.sh", b.getInstallPath(.bin, "have") });
    smoke.setCwd(b.path("."));
    smoke.step.dependOn(b.getInstallStep());

    const contract = b.addSystemCommand(&.{ "sh", "-c",
        \\set -eu
        \\tool=$1
        \\root=.zig-cache/have-contract
        \\rm -rf "$root"
        \\mkdir -p "$root/a" "$root/b" "$root/dup-a" "$root/dup-b" "$root/filter"
        \\cat > "$root/a/alpha" <<'SCRIPT'
        \\#!/bin/sh
        \\echo ran >> .zig-cache/have-contract/ran
        \\SCRIPT
        \\cat > "$root/b/beta" <<'SCRIPT'
        \\#!/bin/sh
        \\echo ran >> .zig-cache/have-contract/ran
        \\SCRIPT
        \\cat > "$root/dup-a/dup" <<'SCRIPT'
        \\#!/bin/sh
        \\echo ran >> .zig-cache/have-contract/ran
        \\SCRIPT
        \\cat > "$root/dup-b/dup" <<'SCRIPT'
        \\#!/bin/sh
        \\echo ran >> .zig-cache/have-contract/ran
        \\SCRIPT
        \\chmod +x "$root/a/alpha" "$root/b/beta" "$root/dup-a/dup" "$root/dup-b/dup"
        \\printf nope > "$root/filter/not-exec"
        \\mkdir "$root/filter/exec-dir"
        \\chmod +x "$root/filter/exec-dir"
        \\ln -s exec-dir "$root/filter/dir-link"
        \\PATH="$root/a:$root/b" "$tool" > "$root/list.out"
        \\test "$(sed -n '1p' "$root/list.out")" = alpha
        \\test "$(sed -n '2p' "$root/list.out")" = beta
        \\test ! -e "$root/ran"
        \\PATH="$root/dup-a:$root/dup-b" "$tool" > "$root/dup.out"
        \\test "$(grep -c '^dup$' "$root/dup.out")" = 1
        \\PATH="$root/filter" "$tool" > "$root/filter.out"
        \\! grep -q '^not-exec$' "$root/filter.out"
        \\! grep -q '^exec-dir$' "$root/filter.out"
        \\! grep -q '^dir-link$' "$root/filter.out"
        \\PATH="$root/a" "$tool" alpha > "$root/query.out"
        \\grep -q '^alpha$' "$root/query.out"
        \\test ! -e "$root/ran"
        \\PATH="$root/a" "$tool" ./alpha > "$root/slash.out" && exit 1 || true
        \\test ! -s "$root/slash.out"
        \\"$tool" --help > "$root/help.out" 2> "$root/help.err"
        \\grep -q '^usage:' "$root/help.out"
        \\test ! -s "$root/help.err"
    , "have-contract", b.getInstallPath(.bin, "have") });
    contract.setCwd(b.path("."));
    contract.step.dependOn(b.getInstallStep());

    const test_step = b.step("test", "Run unit and smoke tests");
    test_step.dependOn(&run_tests.step);
    test_step.dependOn(&smoke.step);
    test_step.dependOn(&contract.step);
}