#!/usr/bin/env bash
# Pre-commit hook for agent-desktop.
# Mirrors the CI quality gates so a failing commit never reaches origin.
#
# Setup (once per clone):
#   git config core.hooksPath .githooks
#
# Bypass for a single commit (only when truly necessary):
#   git commit --no-verify

set -euo pipefail

if [ -n "${SKIP_PRECOMMIT:-}" ]; then
    echo "pre-commit: SKIP_PRECOMMIT set, skipping"
    exit 0
fi

if ! command -v cargo >/dev/null 2>&1; then
    echo "pre-commit: cargo not found in PATH, skipping (install Rust to enable)"
    exit 0
fi

cd "$(git rev-parse --show-toplevel)"

if git diff --cached --name-only --diff-filter=ACMR | grep -qE '\.(rs|toml)$'; then
    HAS_RUST_CHANGES=1
else
    HAS_RUST_CHANGES=0
fi

if git diff --cached --name-only --diff-filter=ACMR | grep -q '^crates/ffi/'; then
    HAS_FFI_CHANGES=1
else
    HAS_FFI_CHANGES=0
fi

if [ "$HAS_RUST_CHANGES" -eq 0 ] && [ "$HAS_FFI_CHANGES" -eq 0 ]; then
    echo "pre-commit: no Rust or FFI changes staged, skipping cargo checks"
    exit 0
fi

run() {
    local label="$1"
    shift
    printf '\033[1;34m▶ %s\033[0m\n' "$label"
    if ! "$@"; then
        printf '\033[1;31m✗ %s failed\033[0m\n' "$label" >&2
        echo "" >&2
        echo "pre-commit: refusing the commit. Fix the issues above or rerun with SKIP_PRECOMMIT=1 to bypass." >&2
        exit 1
    fi
}

run "Rust source rules" scripts/check-rust-file-size.sh
run "cargo fmt --all -- --check" cargo fmt --all -- --check
run "cargo clippy --all-targets -- -D warnings" cargo clippy --all-targets -- -D warnings
run "cargo test --lib --workspace" scripts/cargo-test-isolated-home.sh test --lib --workspace

# FFI-specific gates are skipped when no FFI files are staged. Runtime panic
# and Python smoke proofs remain CI-only to keep commits fast.
if [ "$HAS_FFI_CHANGES" -eq 1 ]; then
    run "FFI stub passthrough" cargo test --locked -p agent-desktop-ffi --features stub-adapter --test c_abi_passthrough

    export PATH="${HOME}/.cargo/bin:${PATH}"
    _cbindgen_cmd=""
    if command -v cbindgen >/dev/null 2>&1; then
        _cbindgen_cmd="cbindgen"
    fi
    if [ -n "${_cbindgen_cmd}" ]; then
        _cbindgen_ver=$("${_cbindgen_cmd}" --version 2>&1 | head -1)
        if [[ "${_cbindgen_ver}" == "cbindgen 0.29.4" ]]; then
            run "FFI header drift (cbindgen --verify)" \
                "${_cbindgen_cmd}" crates/ffi --config crates/ffi/cbindgen.toml \
                --output crates/ffi/include/agent_desktop.h --verify
        else
            printf 'pre-commit: cbindgen version mismatch (want 0.29.4, got: %s) — skipping header drift check (CI gate)\n' "${_cbindgen_ver}"
        fi
    else
        printf 'pre-commit: cbindgen not found in PATH or ~/.cargo/bin — skipping header drift check (CI gate)\n'
    fi
fi

printf '\033[1;32m✓ pre-commit checks passed\033[0m\n'