#!/bin/bash

[ -f testing.sh ] && . testing.sh

#testing "name" "command" "result" "infile" "stdin"

# Use a consistent TZ for these tests, but not GMT/UTC because that
# makes mistakes harder to spot.
tz=Europe/London

# Unix date parsing.
testing "-d @0" "TZ=$tz date -d @0 2>&1" "Thu Jan  1 01:00:00 BST 1970\n" "" ""
testing "-d @0x123 invalid" "TZ=$tz date -d @0x123 2>/dev/null || echo expected error" "expected error\n" "" ""

# POSIX format with 2- and 4-digit years.
# All SKIP_HOST=1 because coreutils rejects POSIX format dates supplied to -d.
# TODO: busybox thinks this should use the current year, not 1900, which would make more sense?
SKIP_HOST=1 testing "-d MMDDhhmm" \
        "TZ=$tz date -d 06021234 2>&1" "Sun Jun  2 12:34:00 UTC 1900\n" "" ""
SKIP_HOST=1 testing "-d MMDDhhmmYY.SS" \
        "TZ=$tz date -d 1110143115.30 2>&1" "Sun Nov 10 14:31:30 UTC 1915\n" "" ""
# busybox thinks this is the year 603 (ISO time 0602-12-34 19:82 with out of range fields normalized).
SKIP_HOST=1 testing "-d MMDDhhmmCCYY" \
        "TZ=$tz date -d 060212341982 2>&1" "Sun Jun  2 12:34:00 UTC 1982\n" "" ""
SKIP_HOST=1 testing "-d MMDDhhmmCCYY.SS" \
        "TZ=$tz date -d 111014312015.30 2>&1" "Sun Nov 10 14:31:30 UTC 2015\n" "" ""

# ISO date format.
testing "-d 1980-01-02" "TZ=$tz date -d 1980-01-02 2>&1" "Wed Jan  2 00:00:00 GMT 1980\n" "" ""
testing "-d 1980-01-02 12:34" "TZ=$tz date -d '1980-01-02 12:34' 2>&1" "Wed Jan  2 12:34:00 GMT 1980\n" "" ""
testing "-d 1980-01-02 12:34:56" "TZ=$tz date -d '1980-01-02 12:34:56' 2>&1" "Wed Jan  2 12:34:56 GMT 1980\n" "" ""

# Reject Unix times without a leading @.
testing "Unix time missing @" "TZ=$tz date 1438053157 2>/dev/null || echo no" \
  "no\n" "" ""

# Test just hour and minute (accepted by coreutils and busybox, presumably for setting the time).
this_year=$(date +%Y)
testing "-d 12:34" 'TZ=UTC date -d 12:34 | grep -q " 12:34:00 UTC $this_year" && echo OK' "OK\n" "" ""
testing "-d 12:34:56" 'TZ=UTC date -d 12:34:56 | grep -q " 12:34:56 UTC $this_year" && echo OK' "OK\n" "" ""

# Test the %N extension to srtftime(3) format strings.
testing "%N" "touch -d 2012-01-23T12:34:56.123456789 f && date -r f +%Y%m%d-%H%M%S.%N" "20120123-123456.123456789\n" "" ""
testing "%1N" "touch -d 2012-01-23T12:34:56.123456789 f && date -r f +%Y%m%d-%H%M%S.%1N" "20120123-123456.1\n" "" ""
testing "%2N" "touch -d 2012-01-23T12:34:56.123456789 f && date -r f +%Y%m%d-%H%M%S.%2N" "20120123-123456.12\n" "" ""
testing "%8N" "touch -d 2012-01-23T12:34:56.123456789 f && date -r f +%Y%m%d-%H%M%S.%8N" "20120123-123456.12345678\n" "" ""
testing "%9N" "touch -d 2012-01-23T12:34:56.123456789 f && date -r f +%Y%m%d-%H%M%S.%9N" "20120123-123456.123456789\n" "" ""
testing "%%N" "touch -d 2012-01-23T12:34:56.123456789 f && date -r f +%Y%m%d-%H%M%S.%%N" "20120123-123456.%N\n" "" ""
testing "trailing %" "touch -d 2012-01-23T12:34:56.123456789 f && date -r f +%Y%m%d-%H%M%S.%" "20120123-123456.%\n" "" ""
testing "just %" "touch -d 2012-01-23T12:34:56.123456789 f && date -r f +%" "%\n" "" ""
rm -f f

# Test embedded TZ to take a date in one time zone and display it in another.
# TODO: not yet working correctly in toybox.
testing "TZ=" "TZ='America/Los_Angeles' date -d 'TZ=\"Europe/London\" 2018-01-04 08:00'" "Thu Jan  4 00:00:00 PST 2018\n" "" ""
testing "TZ=" "TZ='America/Los_Angeles' date -d 'TZ=\"Europe/London\" 2018-10-04 08:00'" "Thu Oct  4 00:00:00 PDT 2018\n" "" ""
testing "TZ= @" "TZ='America/Los_Angeles' date -d 'TZ=\"GMT\" @1533427200'" "Sat Aug  4 17:00:00 PDT 2018\n" "" ""