#!/bin/sh

die () { echo "$@" ; exit 1; }

export NVM_DIR="$(cd ../../.. && pwd)"

: nvm.sh
\. "${NVM_DIR}/nvm.sh"

# 1-hop self-reference: alias points to itself
echo 'self' > '../../../alias/self'

ACTUAL="$(nvm_resolve_alias self)"
EXPECTED='∞'
[ "${ACTUAL}" = "${EXPECTED}" ] || die "expected >${EXPECTED}< for self-reference, got >${ACTUAL}<"

rm -f '../../../alias/self'

# Multi-hop loop: link1 -> link2 -> link3 -> link1
echo 'link2' > '../../../alias/link1'
echo 'link3' > '../../../alias/link2'
echo 'link1' > '../../../alias/link3'

ACTUAL="$(nvm_resolve_alias link1)"
EXPECTED='∞'
[ "${ACTUAL}" = "${EXPECTED}" ] || die "expected >${EXPECTED}< for 3-hop cycle, got >${ACTUAL}<"

rm -f '../../../alias/link1' '../../../alias/link2' '../../../alias/link3'

# Cycle through an alias name containing a space
echo 'midway' > '../../../alias/foo bar'
echo 'foo bar' > '../../../alias/midway'

ACTUAL="$(nvm_resolve_alias 'foo bar')"
EXPECTED='∞'
[ "${ACTUAL}" = "${EXPECTED}" ] || die "expected >${EXPECTED}< for space-name cycle, got >${ACTUAL}<"

rm -f '../../../alias/foo bar' '../../../alias/midway'

# Non-cycle through an alias name containing a space.
# Guards the newline-delimited SEEN_ALIASES storage: with space- or
# token-delimited storage, seen name 'foo bar' would falsely match 'bar'.
# Resolves: 'foo bar' -> 'midway' -> 'bar' -> 0.0.99
echo 'midway' > '../../../alias/foo bar'
echo 'bar' > '../../../alias/midway'
echo '0.0.99' > '../../../alias/bar'

ACTUAL="$(nvm_resolve_alias 'foo bar')"
EXPECTED='v0.0.99'
[ "${ACTUAL}" = "${EXPECTED}" ] || die "expected >${EXPECTED}< for space-name chain, got >${ACTUAL}<"

rm -f '../../../alias/foo bar' '../../../alias/midway' '../../../alias/bar'

# Non-cycle through an alias name containing a regex metacharacter.
# Guards the literal `case` matching: the previous grep-based detection
# interpolated the resolved name into an anchored regex, so resolving 'axb'
# matched the seen name 'axb' against the pattern 'a.b' and falsely
# reported a cycle.
# Resolves: 'axb' -> 'a.b' -> 0.0.99
echo 'a.b' > '../../../alias/axb'
echo '0.0.99' > '../../../alias/a.b'

ACTUAL="$(nvm_resolve_alias axb)"
EXPECTED='v0.0.99'
[ "${ACTUAL}" = "${EXPECTED}" ] || die "expected >${EXPECTED}< for metachar-name chain, got >${ACTUAL}<"

# ... while a genuine cycle through a metachar name is still detected
echo 'axb' > '../../../alias/a.b'

ACTUAL="$(nvm_resolve_alias axb)"
EXPECTED='∞'
[ "${ACTUAL}" = "${EXPECTED}" ] || die "expected >${EXPECTED}< for metachar-name cycle, got >${ACTUAL}<"

rm -f '../../../alias/axb' '../../../alias/a.b'