#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
LUSH="${LUSH:-$SCRIPT_DIR/lua}"
COMPAT_DIR="$SCRIPT_DIR/compat-tests"

if [[ "${1:-}" == "--clean" ]]; then
    rm -rf "$COMPAT_DIR"
    echo "Cleaned $COMPAT_DIR"
fi

mkdir -p "$COMPAT_DIR"

# --- Helpers ---

RESULTS_FILE="$COMPAT_DIR/.results.tmp"
FAIL_COUNT=0
: > "$RESULTS_FILE"

run_test() {
    local name="$1"; shift
    local logfile="$COMPAT_DIR/$name.log"
    echo "--- Running $name ---"
    if "$@" >"$logfile" 2>&1; then
        echo "$name|PASS" >>"$RESULTS_FILE"
        echo "  PASS"
    else
        echo "$name|FAIL" >>"$RESULTS_FILE"
        echo "  FAIL (see $logfile)"
        ((FAIL_COUNT++)) || true
    fi
}

print_summary() {
    echo ""
    echo "=== Compatibility Test Results ==="
    while IFS='|' read -r name status; do
        printf "  %-20s %s\n" "$name" "$status"
    done <"$RESULTS_FILE"
    echo ""
    rm -f "$RESULTS_FILE"
}

clone_or_pull() {
    local name="$1" url="$2" tag="$3"
    local dest="$COMPAT_DIR/$name"
    if [[ -d "$dest" ]]; then
        echo "--- $name: already cloned ---"
    else
        echo "--- Cloning $name @ $tag ---"
        git clone --depth 1 --branch "$tag" "$url" "$dest"
    fi
}

# --- Check Lush binary ---

if [[ ! -x "$LUSH" ]]; then
    echo "Error: Lush binary not found at $LUSH"
    echo "Run 'make' first, or set LUSH=/path/to/lua"
    exit 1
fi

echo "Using Lush binary: $LUSH"
echo ""

# === lua-TestMore (TAP test framework) ===

clone_or_pull "lua-TestMore" "https://framagit.org/fperrad/lua-TestMore.git" "0.3.5"
(
    cd "$COMPAT_DIR/lua-TestMore"
    export LUA_PATH="$COMPAT_DIR/lua-TestMore/src/?.lua;;"
    run_test "lua-TestMore" "$LUSH" test/00require.t
)

# === json.lua (JSON encoder/decoder) ===

clone_or_pull "json.lua" "https://github.com/rxi/json.lua.git" "v0.1.2"
(
    cd "$COMPAT_DIR/json.lua/test"
    run_test "json.lua" "$LUSH" test.lua
)

# === lume (utility library, 264 tests) ===

clone_or_pull "lume" "https://github.com/rxi/lume.git" "v2.3.0"
(
    cd "$COMPAT_DIR/lume/test"
    run_test "lume" "$LUSH" test.lua
)

# === Summary ===

print_summary
exit "$FAIL_COUNT"