#!/bin/env bash

set -euox pipefail

# Make all cargo invocations verbose.
export CARGO_TERM_VERBOSE=true

main() {
    crate="$1"
    task="$2"

    check_required_commands

    cargo --version
    rustc --version
    /usr/bin/env bash --version
    locale
    env

    cd "$crate"

    # Building the fuzz crate is more-or-less just a sanity check.
    if [ "$crate" == "fuzz" ]
    then
        cargo --locked build
        exit 0
    fi

    # Every crate must define EXAMPLES.
    . contrib/test_vars.sh || exit 1

    case $task in
	test)
	    do_test
	    ;;

	feature_matrix)
	    do_feature_matrix
	    ;;

	lint)
	    do_lint
	    ;;

	dup_deps)
	    do_dup_deps
	    ;;

	docs)
            build_docs_with_stable_toolchain
	    ;;

	docsrs)
            build_docs_with_nightly_toolchain
	    ;;

	wasm)
	    do_wasm
	    ;;

	asan)
	    do_asan
	    ;;

	bench)
	    do_bench
	    ;;

	schemars)
	    do_schemars
	    ;;
	*)
	    err "Error: unknown task $task"
	    ;;
    esac
}

do_test() {
    # Use the current (recent/minimal) lock file.
    local cargo="cargo --locked"

    # Defaults / sanity checks
    $cargo build
    $cargo test

    for example in $EXAMPLES; do
	name="$(echo "$example" | cut -d ':' -f 1)"
	features="$(echo "$example" | cut -d ':' -f 2)"
	$cargo run --example "$name" --features="$features"
    done

    if [ -e ./contrib/extra_tests.sh ];
    then
	./contrib/extra_tests.sh
    fi
}

# Each crate defines its own feature matrix test so feature combinations
# can be better controlled.
do_feature_matrix() {
    local cargo="cargo --locked"

    $cargo build --no-default-features
    $cargo test --no-default-features

    # All crates have a "std" feature.
    loop_features "std" "$FEATURES_WITH_STD"

    # All but `bitcoin` crate have an "alloc" feature, this tests it
    # along with any other features that should work with "std".
    if [ -n "$FEATURES_WITHOUT_STD" ]
       then
           loop_features "" "$FEATURES_WITHOUT_STD"
    fi
}

# Build with each feature as well as all combinations of two features.
#
# Usage: loop_features "std" "this-feature that-feature other"
loop_features() {
    local use="$1"
    local features="$2"
    local cargo="cargo --locked"

    # All the provided features including $use
    $cargo build --no-default-features --features="$use $features"
    $cargo test --no-default-features --features="$use $features"

    read -r -a array <<< "$features"
    local len="${#array[@]}"

    if (( len > 1 )); then
        for ((i = 0 ; i < len ; i++ ));
        do
            $cargo build --features="$use ${array[i]}"
            $cargo test --features="$use ${array[i]}"

            if (( i < len - 1 )); then
               for ((j = i + 1 ; j < len ; j++ ));
               do
                   $cargo build --features="$use ${array[i]} ${array[j]}"
                   $cargo test --features="$use ${array[i]} ${array[j]}"
               done
            fi
        done
    fi
}

# Lint the workspace then the individual crate examples.
do_lint() {
    need_nightly

    # Use the current (recent/minimal) lock file.
    local cargo="cargo --locked"

    $cargo clippy --workspace -- -D warnings

    for example in $EXAMPLES; do
	name=$(echo "$example" | cut -d ':' -f 1)
	features=$(echo "$example" | cut -d ':' -f 2)
	$cargo clippy --example "$name" --features="$features" -- -D warnings
    done
}

# We should not have any duplicate dependencies. This catches mistakes made upgrading dependencies
# in one crate and not in another (e.g. upgrade bitcoin_hashes in bitcoin but not in secp).
do_dup_deps() {
    # We can't use pipefail because these grep statements fail by design when there is no duplicate,
    # the shell therefore won't pick up mistakes in your pipe - you are on your own.
    set +o pipefail

    duplicate_dependencies=$(
        # Only show the actual duplicated deps, not their reverse tree, then
        # whitelist the 'syn' crate which is duplicated but it's not our fault.
        #
        # Temporarily allow 2 versions of `hashes` and `hex` while we upgrade.
        cargo tree  --target=all --all-features --duplicates \
            | grep '^[0-9A-Za-z]' \
            | grep -v 'syn' \
            | grep -v 'bitcoin_hashes' \
            | grep -v 'hex-conservative' \
            | wc -l
                          )
    if [ "$duplicate_dependencies" -ne 0 ]; then
        echo "Dependency tree is broken, contains duplicates"
        cargo tree  --target=all --all-features --duplicates
        exit 1
    fi

    set -o pipefail
}

# Build the docs with a nightly toolchain, in unison with the function
# below this checks that we feature guarded docs imports correctly.
build_docs_with_nightly_toolchain() {
    need_nightly
    local cargo="cargo --locked"

    RUSTDOCFLAGS="--cfg docsrs -D warnings -D rustdoc::broken-intra-doc-links" $cargo doc --all-features
}

# Build the docs with a stable toolchain, in unison with the function
# above this checks that we feature guarded docs imports correctly.
build_docs_with_stable_toolchain() {
    local cargo="cargo +stable --locked"

    RUSTDOCFLAGS="-D warnings" $cargo doc --all-features
}

do_wasm() {
    clang --version &&
	CARGO_TARGET_DIR=wasm cargo install --force wasm-pack &&
	printf '\n[target.wasm32-unknown-unknown.dev-dependencies]\nwasm-bindgen-test = "0.3"\n' >> Cargo.toml &&
	printf '\n[lib]\ncrate-type = ["cdylib", "rlib"]\n' >> Cargo.toml &&
	CC=clang-9 wasm-pack build &&
	CC=clang-9 wasm-pack test --node;
}

do_asan() {
    cargo clean
    CC='clang -fsanitize=address -fno-omit-frame-pointer'                                        \
      RUSTFLAGS='-Zsanitizer=address -Clinker=clang -Cforce-frame-pointers=yes'                    \
      ASAN_OPTIONS='detect_leaks=1 detect_invalid_pointer_pairs=1 detect_stack_use_after_return=1' \
      cargo test --lib --no-default-features --features="$ASAN_FEATURES" -Zbuild-std --target x86_64-unknown-linux-gnu
    # There is currently a bug in the MemorySanitizer (MSAN) - disable the job for now.
    #
    # cargo clean
    # CC='clang -fsanitize=memory -fno-omit-frame-pointer'                                         \
    #   RUSTFLAGS='-Zsanitizer=memory -Zsanitizer-memory-track-origins -Cforce-frame-pointers=yes'   \
    #   cargo test --lib --no-default-features --features="$ASAN_FEATURES" -Zbuild-std --target x86_64-unknown-linux-gnu
}

# Bench only works with a non-stable toolchain (nightly, beta).
do_bench() {
    RUSTFLAGS='--cfg=bench' cargo bench
}

# This is only relevant for hashes.
do_schemars() {
    cd "extended_tests/schemars" > /dev/null
    cargo test
}

# Check all the commands we use are present in the current environment.
check_required_commands() {
    need_cmd cargo
    need_cmd rustc
    need_cmd jq
    need_cmd cut
    need_cmd grep
    need_cmd wc
}

need_cmd() {
    if ! command -v "$1" > /dev/null 2>&1
    then err "need '$1' (command not found)"
    fi
}

need_nightly() {
    cargo_ver=$(cargo --version)
    if echo "$cargo_ver" | grep -q -v nightly; then
        err "Need a nightly compiler; have $(cargo --version)"
    fi
}

err() {
    echo "$1" >&2
    exit 1
}

#
# Main script
#
main "$@"
exit 0