#!/usr/bin/env bash
# Git pre-commit hook: format and lint staged files using project formatters.
# Reuses the same formatter scripts from formatters/.
# Exits non-zero if lint errors remain after auto-fix (blocks commit).

# Find formatters/ directory relative to repo root
REPO_ROOT="$(git rev-parse --show-toplevel 2>/dev/null)"
[ -z "$REPO_ROOT" ] && exit 0

FORMATTERS_DIR="$REPO_ROOT/formatters"
[ -d "$FORMATTERS_DIR" ] || exit 0

HAD_ERRORS=0
ERROR_OUTPUT=""

# Iterate staged files (only Added/Modified, not Deleted)
while IFS= read -r FILE; do
    [ -z "$FILE" ] && continue

    ABS_FILE="$REPO_ROOT/$FILE"
    [ -f "$ABS_FILE" ] || continue

    # Extract extension (normalise yml → yaml)
    EXT="${FILE##*.}"
    case "$EXT" in
        yml) EXT="yaml" ;;
    esac
    [ -z "$EXT" ] || [ "$EXT" = "$FILE" ] && continue

    # Check for formatter
    FORMATTER="$FORMATTERS_DIR/$EXT"
    [ -x "$FORMATTER" ] || continue

    # Run formatter
    ERRORS=$("$FORMATTER" "$ABS_FILE" 2>&1)
    EXIT_CODE=$?

    # Re-stage the file (formatter may have modified it)
    git add "$ABS_FILE"

    if [ $EXIT_CODE -ne 0 ]; then
        HAD_ERRORS=1
        ERROR_OUTPUT="${ERROR_OUTPUT}${FILE}:\n${ERRORS}\n\n"
    fi
done < <(git diff --cached --name-only --diff-filter=AM)

if [ $HAD_ERRORS -ne 0 ]; then
    echo "Pre-commit lint errors — commit blocked:" >&2
    echo -e "$ERROR_OUTPUT" >&2
    echo "Fix the errors above and try again." >&2
    exit 1
fi

exit 0