#!/bin/bash
#
# editor_test.sh — Regression tests for the Klammertext editor support
# (the Emacs mode's indentation/alignment units and their Sublime Text ports).
#
# Why this lives in tst/: the editor code implements the LANGUAGE's structural
# layer — @-run length, bar-run dimension, ^-escapes, # removal, literal
# spans, nesting depth — independently of both the SKS and the Klammermachine.
# tst/ is the SKS-independent tier, and these suites check that the
# independent implementations of Klammertext's structure agree with the
# canonical formatting conventions AND with each other.  The klammer names
# that appear in the fixtures (@ol, @table, @document, @code) are seeded
# configuration of the editor tools, not SKS dependencies; nothing here runs
# ktext or loads a klammer set.
#
# What is checked, for every fixture pair <name>.kt / <name>_expected.kt in
# tst/editor/:
#   * the Sublime Python core's output equals the expected file
#   * idempotence: the tool applied to the expected file leaves it unchanged
#   * when Emacs is installed: the Emacs unit's output equals the expected
#     file, and equals the Python output byte for byte (the sync check across
#     the SYNC-noted policy lists) — skipped gracefully otherwise
#
# The editor code is located automatically: doc/emacs + doc/sublime in the
# development tree, doc/edit/emacs + doc/edit/sublime in the distribution.
#
# Usage: ./editor_test.sh          Requires python3; Emacs is optional.
# Exit code: 0 if all tests pass, 1 otherwise.

PASS=0
FAIL=0

red=$'\033[31m'
green=$'\033[32m'
bold=$'\033[1m'
reset=$'\033[0m'

HERE="$(cd "$(dirname "$0")" && pwd)"
ROOT="$(cd "$HERE/.." && pwd)"
if [ -d "$ROOT/doc/emacs" ]; then
    EMACS_DIR="$ROOT/doc/emacs"
    SUBLIME_DIR="$ROOT/doc/sublime"
elif [ -d "$ROOT/doc/edit/emacs" ]; then
    EMACS_DIR="$ROOT/doc/edit/emacs"
    SUBLIME_DIR="$ROOT/doc/edit/sublime"
else
    echo "editor_test.sh: cannot locate the editor support (doc/emacs or doc/edit/emacs)" >&2
    exit 1
fi
FIX="$HERE/editor"
OUT="$(mktemp -d)"
trap 'rm -rf "$OUT"' EXIT

INDENT_FIXTURES="indent_list indent_document indent_table indent_untouched
                 indent_defs indent_escapes indent_named_close"
ALIGN_FIXTURES="align_mixed align_empty_cells align_boundary align_colspan
                align_escapes align_too_wide"

# Build the (MODE INFILE OUTFILE) triples: each fixture is run from its input
# and from its expected file (the idempotence check).
py_args=()
el_args=()
add_fixture() {   # add_fixture MODE NAME
    local mode="$1" name="$2"
    py_args+=("$mode" "$FIX/$name.kt"           "$OUT/$name.py.out")
    py_args+=("$mode" "$FIX/${name}_expected.kt" "$OUT/$name.py.idem")
    el_args+=("$mode" "$FIX/$name.kt"           "$OUT/$name.el.out")
    el_args+=("$mode" "$FIX/${name}_expected.kt" "$OUT/$name.el.idem")
}
for f in $INDENT_FIXTURES; do add_fixture indent "$f"; done
for f in $ALIGN_FIXTURES;  do add_fixture align  "$f"; done

# --- run the Sublime Python cores (required) -------------------------------
if ! command -v python3 >/dev/null 2>&1; then
    echo "editor_test.sh: python3 not found" >&2
    exit 1
fi
if ! PYTHONDONTWRITEBYTECODE=1 python3 "$FIX/editor_driver.py" "$SUBLIME_DIR" "${py_args[@]}"; then
    echo "editor_test.sh: the Python driver failed" >&2
    exit 1
fi

# --- run the Emacs units (optional) ----------------------------------------
HAVE_EMACS=0
if command -v emacs >/dev/null 2>&1; then
    if emacs --batch -L "$EMACS_DIR" \
             -l klammertext-mode -l klammertext-indent -l klammertext-align \
             -l "$FIX/editor_driver.el" "${el_args[@]}" 2>"$OUT/emacs.log"; then
        HAVE_EMACS=1
    else
        echo "${red}FAIL${reset} the Emacs driver failed:" >&2
        cat "$OUT/emacs.log" >&2
        FAIL=$((FAIL + 1))
    fi
else
    echo "(Emacs not installed — the Emacs half is skipped; the Python cores still run)"
fi

# --- compare ---------------------------------------------------------------
check() {   # check NAME FILE_A FILE_B
    if diff -q "$2" "$3" >/dev/null 2>&1; then
        echo "${green}PASS${reset} $1"
        PASS=$((PASS + 1))
    else
        echo "${red}FAIL${reset} $1"
        diff "$2" "$3" | head -10
        FAIL=$((FAIL + 1))
    fi
}

for f in $INDENT_FIXTURES $ALIGN_FIXTURES; do
    check "$f (python)"            "$OUT/$f.py.out"  "$FIX/${f}_expected.kt"
    check "$f (python idempotent)" "$OUT/$f.py.idem" "$FIX/${f}_expected.kt"
    if [ "$HAVE_EMACS" = 1 ]; then
        check "$f (emacs)"            "$OUT/$f.el.out"  "$FIX/${f}_expected.kt"
        check "$f (emacs idempotent)" "$OUT/$f.el.idem" "$FIX/${f}_expected.kt"
        check "$f (emacs == python)"  "$OUT/$f.el.out"  "$OUT/$f.py.out"
    fi
done

echo
echo "${bold}editor_test: $PASS passed, $FAIL failed${reset}"
[ "$FAIL" -eq 0 ]