#!/bin/sh
# tests/test_diff.sh - Tests for diff applet
_test_name="diff"
. "$(dirname "$0")/harness.sh"
_srcdir="$(cd "$(dirname "$0")/../src/diff/tests" && pwd)"

setup_tmpdir
DIFF="$VX diff"

echo "Running diff tests..."

# --- simple: normal, ed, unified, nreverse, brief, ignore-case, whitespace ---
check_exit "simple: normal diff" 1 \
    $DIFF "$_srcdir/input1.in" "$_srcdir/input2.in"

_got="$($DIFF "$_srcdir/input1.in" "$_srcdir/input2.in" 2>/dev/null)" || true
_exp="$(cat "$_srcdir/simple.out")"
check_eq "$_got" "$_exp" "simple: normal output matches"

_got="$($DIFF -e "$_srcdir/input1.in" "$_srcdir/input2.in" 2>/dev/null)" || true
_exp="$(cat "$_srcdir/simple_e.out")"
check_eq "$_got" "$_exp" "simple: ed output matches"

_got="$($DIFF -u -L input1 -L input2 "$_srcdir/input1.in" "$_srcdir/input2.in" 2>/dev/null)" || true
_exp="$(cat "$_srcdir/simple_u.out")"
check_eq "$_got" "$_exp" "simple: unified output matches"

_got="$($DIFF -n "$_srcdir/input1.in" "$_srcdir/input2.in" 2>/dev/null)" || true
_exp="$(cat "$_srcdir/simple_n.out")"
check_eq "$_got" "$_exp" "simple: nreverse output matches"

# brief mode
$DIFF -q "$_srcdir/input1.in" "$_srcdir/input2.in" >/dev/null 2>&1
check_eq "$?" "1" "simple: brief exit 1 on different"

check_exit "simple: brief exit 0 on identical" 0 \
    $DIFF -q "$_srcdir/input1.in" "$_srcdir/input1.in"

# ignore case
_got="$($DIFF -i "$_srcdir/input_c1.in" "$_srcdir/input_c2.in" 2>/dev/null)" || true
_exp="$(cat "$_srcdir/simple_i.out")"
check_eq "$_got" "$_exp" "simple: ignore-case output matches"

# ignore whitespace
_got="$($DIFF -w "$_srcdir/input_c1.in" "$_srcdir/input_c2.in" 2>/dev/null)" || true
_exp="$(cat "$_srcdir/simple_w.out")"
check_eq "$_got" "$_exp" "simple: ignore-whitespace output matches"

# ignore space changes
_got="$($DIFF -b "$_srcdir/input_c1.in" "$_srcdir/input_c2.in" 2>/dev/null)" || true
_exp="$(cat "$_srcdir/simple_b.out")"
check_eq "$_got" "$_exp" "simple: space-change output matches"

# --- unified with function names ---
_got="$($DIFF -up -L input_c1.in -L input_c2.in "$_srcdir/input_c1.in" "$_srcdir/input_c2.in" 2>/dev/null)" || true
_exp="$(cat "$_srcdir/unified_p.out")"
check_eq "$_got" "$_exp" "unified: -p output matches"

# --- strip trailing CR ---
printf 'a\nb\r\nc\n' > cr_a.in
printf 'a\r\nb\r\nc\r\n' > cr_b.in
check_exit "stripcr: identical after strip" 0 \
    $DIFF -up --strip-trailing-cr -L a -L b cr_a.in cr_b.in

# --- -B (ignore blank lines) ---
printf "A\nB\n" > bflag_a
printf "A\n\nB\n" > bflag_b
check_exit "Bflag: ignore blank lines" 0 $DIFF -B bflag_a bflag_b

# --- -w (ignore all whitespace) ---
printf 'a b\n' > ws_a
printf 'a  b\n' > ws_b
check_exit "whitespace: -qw identical" 0 $DIFF -qw ws_a ws_b

# --- side-by-side ---
printf "A\nB\nC\n" > sby_a
printf "D\nB\nE\n" > sby_b
$DIFF -y sby_a sby_b > sby_out 2>&1 || true
check_grep "B" sby_out "side-by-side: contains common line"
check_grep "|" sby_out "side-by-side: contains change marker"

# --- brief recursive ---
mkdir -p rA rB
echo 1 > rA/test-file
echo 2 > rB/test-file
_got="$($DIFF -rq rA rB 2>/dev/null)" || true
check_eq "$_got" "Files rA/test-file and rB/test-file differ" "brief: recursive diff"

# --- identical files ---
check_exit "identical: exit 0" 0 $DIFF "$_srcdir/input1.in" "$_srcdir/input1.in"

# --- Nflag: treat absent files as empty ---
printf "foo" > nflag_a
check_exit "Nflag: absent second file" 1 $DIFF -N nflag_a NOFILE

# --- conflicting format flags ---
printf "A\n" > cfmt_a
printf "B\n" > cfmt_b
check_exit "conflicting: -c -u exits 2" 2 $DIFF -c -u cfmt_a cfmt_b

summary