#!/bin/sh
# Self-test for the three gate scripts. It builds small fake trees in a temporary
# directory and checks that each script passes the good tree and fails the bad ones.
# Do not edit: this file defines the required behaviour of the scripts.
set -eu
here=$(cd "$(dirname "$0")" && pwd)
tmp=$(mktemp -d)
trap 'rm -rf "$tmp"' EXIT
fails=0

expect() { # expect pass|fail NAME SCRIPT ROOT
    want="$1"; name="$2"; script="$3"; root="$4"
    if sh "$here/$script" "$root" >/dev/null 2>&1; then got=pass; else got=fail; fi
    if [ "$got" != "$want" ]; then
        echo "test-gate-scripts: $name: expected $want, got $got" >&2
        fails=$((fails + 1))
    fi
}

manifest() { # manifest DIR NAME [DEPENDENCY-LINES...]
    dir="$1"; name="$2"; shift 2
    mkdir -p "$dir/src"
    {
        printf '[package]\nname = "%s"\nversion = "0.1.0"\n\n[dependencies]\n' "$name"
        for line in "$@"; do printf '%s\n' "$line"; done
    } > "$dir/Cargo.toml"
}

tree() { # tree ROOT: a good workspace with proto, loopd and brokerd
    root="$1"
    mkdir -p "$root/docs"
    printf '[workspace]\nmembers = ["crates/*"]\n\n[workspace.dependencies]\nproto = { path = "crates/proto" }\nserde = { version = "1", features = ["derive"] }\n' > "$root/Cargo.toml"
    printf '# Dependencies\n\n| Crate | Why |\n|---|---|\n| `serde` | types |\n' > "$root/docs/dependencies.md"
    manifest "$root/crates/proto" proto 'serde.workspace = true'
    manifest "$root/crates/loopd" loopd 'proto.workspace = true'
    manifest "$root/crates/brokerd" brokerd 'proto = { workspace = true }' 'serde.workspace = true'
}

lines() { # lines N FILE
    mkdir -p "$(dirname "$2")"
    i=0; : > "$2"
    while [ "$i" -lt "$1" ]; do echo "// line" >> "$2"; i=$((i + 1)); done
}

# check-lines.sh
tree "$tmp/l-ok";   lines 500 "$tmp/l-ok/crates/loopd/src/lib.rs"
expect pass "500 lines is allowed" check-lines.sh "$tmp/l-ok"
tree "$tmp/l-bad";  lines 501 "$tmp/l-bad/crates/loopd/src/deep/mod.rs"
expect fail "501 lines in a nested file" check-lines.sh "$tmp/l-bad"
tree "$tmp/l-test"; lines 501 "$tmp/l-test/crates/proto/tests/big.rs"
expect fail "501 lines in a test file" check-lines.sh "$tmp/l-test"
tree "$tmp/l-tgt";  lines 501 "$tmp/l-tgt/crates/proto/target/debug/gen.rs"
expect pass "files under target/ are ignored" check-lines.sh "$tmp/l-tgt"

# check-crate-deps.sh
tree "$tmp/c-ok"
expect pass "roles depend only on proto" check-crate-deps.sh "$tmp/c-ok"
tree "$tmp/c-role"; manifest "$tmp/c-role/crates/loopd" loopd 'proto.workspace = true' 'brokerd.workspace = true'
expect fail "role depends on another role" check-crate-deps.sh "$tmp/c-role"
tree "$tmp/c-tbl";  manifest "$tmp/c-tbl/crates/loopd" loopd 'brokerd = { path = "../brokerd" }'
expect fail "role depends on another role by path" check-crate-deps.sh "$tmp/c-tbl"
tree "$tmp/c-dev";  printf '\n[dev-dependencies]\nbrokerd.workspace = true\n' >> "$tmp/c-dev/crates/loopd/Cargo.toml"
expect fail "role dev-depends on another role" check-crate-deps.sh "$tmp/c-dev"
tree "$tmp/c-proto"; manifest "$tmp/c-proto/crates/proto" proto 'loopd.workspace = true'
expect fail "proto depends on a role" check-crate-deps.sh "$tmp/c-proto"

# check-dep-docs.sh
tree "$tmp/d-ok"
expect pass "every dependency is documented" check-dep-docs.sh "$tmp/d-ok"
tree "$tmp/d-miss"; printf 'rand = "0.9"\n' >> "$tmp/d-miss/Cargo.toml"
expect fail "workspace dependency without a docs row" check-dep-docs.sh "$tmp/d-miss"
tree "$tmp/d-prose"; printf 'rand = "0.9"\n' >> "$tmp/d-prose/Cargo.toml"; printf '\nWe do not use rand.\n' >> "$tmp/d-prose/docs/dependencies.md"
expect fail "a mention in prose is not a table row" check-dep-docs.sh "$tmp/d-prose"
tree "$tmp/d-loose"; manifest "$tmp/d-loose/crates/loopd" loopd 'proto.workspace = true' 'rand = "0.9"'
expect fail "crate declares a dependency outside the workspace table" check-dep-docs.sh "$tmp/d-loose"

if [ "$fails" -ne 0 ]; then
    echo "test-gate-scripts: $fails failure(s)" >&2
    exit 1
fi
echo "test-gate-scripts: ok"