#!/bin/bash

# Run all the different permutations of all the tests and other things
# This helps ensure that nothing gets broken.

_tests() {
    local vet="" # TODO: make it off
    local gover=$( ${gocmd} version | cut -f 3 -d ' ' )
    [[ $( ${gocmd} version ) == *"gccgo"* ]] && zcover=0
    case $gover in
        go1.[7-9]*|go1.1[0-9]*|go2.*|devel*) true ;;
        *) return 1
    esac
    # note that codecgen requires fastpath, so you cannot do "codecgen notfastpath"
    # we test the following permutations wnich all execute different code paths as below.
    echo "TestCodecSuite: (fastpath/unsafe), (fastpath/!unsafe), (!fastpath/!unsafe), (codecgen/unsafe)"
    local nc=1 # count
    local a=( "" "safe" "notfastpath safe"  "codecgen" )
    local b=()
    local c=()
    for i in "${a[@]}"
    do
        local i2=${i:-default}
        [[ "$zwait" == "1" ]] && echo ">>>> TAGS: 'alltests $i'; RUN: 'TestCodecSuite'"
        [[ "$zcover" == "1" ]] && c=( -coverprofile "${i2// /-}.cov.out" )
        true &&
            ${gocmd} vet -printfuncs "errorf" "$@" &&
            ${gocmd} test ${zargs[*]} ${ztestargs[*]} -vet "$vet" -tags "alltests $i" -count $nc -run "TestCodecSuite" "${c[@]}" "$@" &
        b+=("${i2// /-}.cov.out")
        [[ "$zwait" == "1" ]] && wait
            
        # if [[ "$?" != 0 ]]; then return 1; fi
    done
    if [[ "$zextra" == "1" ]]; then
        [[ "$zwait" == "1" ]] && echo ">>>> TAGS: 'notfastpath x'; RUN: 'Test.*X$'"
        [[ "$zcover" == "1" ]] && c=( -coverprofile "x.cov.out" )
        ${gocmd} test ${zargs[*]} ${ztestargs[*]} -vet "$vet" -tags "notfastpath x" -count $nc -run 'Test.*X$' "${c[@]}" &
        b+=("x.cov.out")
        [[ "$zwait" == "1" ]] && wait
    fi
    wait
    # go tool cover is not supported for gccgo.
    [[ "$zcover" == "1" ]] &&
        command -v gocovmerge &&
        gocovmerge "${b[@]}" > __merge.cov.out &&
        ${gocmd} tool cover -html=__merge.cov.out
}

# is a generation needed?
_ng() {
    local a="$1"
    if [[ ! -e "$a" ]]; then echo 1; return; fi 
    for i in `ls -1 *.go.tmpl gen.go values_test.go`
    do
        if [[ "$a" -ot "$i" ]]; then echo 1; return; fi 
    done
}

_prependbt() {
    cat > ${2} <<EOF
// +build generated

EOF
    cat ${1} >> ${2}
    rm -f ${1}
}

# _build generates fast-path.go and gen-helper.go.
_build() {
    if ! [[ "${zforce}" || $(_ng "fast-path.generated.go") || $(_ng "gen-helper.generated.go") || $(_ng "gen.generated.go") ]]; then return 0; fi 
    
    if [ "${zbak}" ]; then
        _zts=`date '+%m%d%Y_%H%M%S'`
        _gg=".generated.go"
        [ -e "gen-helper${_gg}" ] && mv gen-helper${_gg} gen-helper${_gg}__${_zts}.bak
        [ -e "fast-path${_gg}" ] && mv fast-path${_gg} fast-path${_gg}__${_zts}.bak
        [ -e "gen${_gg}" ] && mv gen${_gg} gen${_gg}__${_zts}.bak
    fi 
    rm -f gen-helper.generated.go fast-path.generated.go gen.generated.go \
       *safe.generated.go *_generated_test.go *.generated_ffjson_expose.go 

    cat > gen.generated.go <<EOF
// +build codecgen.exec

// Copyright (c) 2012-2020 Ugorji Nwoke. All rights reserved.
// Use of this source code is governed by a MIT license found in the LICENSE file.

package codec

// DO NOT EDIT. THIS FILE IS AUTO-GENERATED FROM gen-dec-(map|array).go.tmpl

const genDecMapTmpl = \`
EOF
    cat >> gen.generated.go < gen-dec-map.go.tmpl
    cat >> gen.generated.go <<EOF
\`

const genDecListTmpl = \`
EOF
    cat >> gen.generated.go < gen-dec-array.go.tmpl
    cat >> gen.generated.go <<EOF
\`

const genEncChanTmpl = \`
EOF
    cat >> gen.generated.go < gen-enc-chan.go.tmpl
    cat >> gen.generated.go <<EOF
\`
EOF
    cat > gen-from-tmpl.codec.generated.go <<EOF
package codec 
func GenRunTmpl2Go(in, out string) { genRunTmpl2Go(in, out) }
func GenRunSortTmpl2Go(in, out string) { genRunSortTmpl2Go(in, out) }
EOF

    # stub xxxRv and xxxRvSlice creation, before you create it
    cat > gen-from-tmpl.sort-slice-stubs.generated.go <<EOF
// +build codecgen.sort_slice

package codec

import "reflect"
import "time"

EOF

    for i in string bool uint64 int64 float64 bytes time; do
        local i2=$i
        case $i in
            'time' ) i2="time.Time";;
            'bytes' ) i2="[]byte";;
        esac

        cat >> gen-from-tmpl.sort-slice-stubs.generated.go <<EOF
type ${i}Rv struct { v ${i2}; r reflect.Value }

type ${i}RvSlice []${i}Rv

func (${i}RvSlice) Len() int { return 0 }
func (${i}RvSlice) Less(i, j int) bool { return false }
func (${i}RvSlice) Swap(i, j int) {}

EOF
    done

    sed -e 's+// __DO_NOT_REMOVE__NEEDED_FOR_REPLACING__IMPORT_PATH__FOR_CODEC_BENCH__+import . "github.com/ugorji/go/codec"+' \
        shared_test.go > bench/shared_test.go

    # explicitly return 0 if this passes, else return 1
    local btags="notfastpath safe codecgen.exec"
    rm -f sort-slice.generated.go fast-path.generated.go gen-helper.generated.go mammoth_generated_test.go mammoth2_generated_test.go
    
    cat > gen-from-tmpl.sort-slice.generated.go <<EOF
// +build ignore

package main

import "${zpkg}"

func main() {
codec.GenRunSortTmpl2Go("sort-slice.go.tmpl", "sort-slice.generated.go")
}
EOF

    ${gocmd} run -tags "$btags codecgen.sort_slice" gen-from-tmpl.sort-slice.generated.go || return 1
    rm -f gen-from-tmpl.sort-slice.generated.go
    
    cat > gen-from-tmpl.generated.go <<EOF
// +build ignore

package main

import "${zpkg}"

func main() {
codec.GenRunTmpl2Go("fast-path.go.tmpl", "fast-path.generated.go")
codec.GenRunTmpl2Go("gen-helper.go.tmpl", "gen-helper.generated.go")
codec.GenRunTmpl2Go("mammoth-test.go.tmpl", "mammoth_generated_test.go")
codec.GenRunTmpl2Go("mammoth2-test.go.tmpl", "mammoth2_generated_test.go")
}
EOF

    ${gocmd} run -tags "$btags" gen-from-tmpl.generated.go || return 1
    rm -f gen-from-tmpl.generated.go
    
    rm -f gen-from-tmpl.*generated.go
    return 0
}

_codegenerators() {
    local c5="_generated_test.go"
    local c7="$PWD/codecgen"
    local c8="$c7/__codecgen"
    local c9="codecgen-scratch.go"

    if ! [[ $zforce || $(_ng "values_codecgen${c5}") ]]; then return 0; fi
    
    # Note: ensure you run the codecgen for this codebase/directory i.e. ./codecgen/codecgen
    true &&
        echo "codecgen ... " &&
        if [[ $zforce || ! -f "$c8" || "$c7/gen.go" -nt "$c8" ]]; then
            echo "rebuilding codecgen ... " && ( cd codecgen && ${gocmd} build -o $c8 ${zargs[*]} . )
        fi &&
        $c8 -rt 'codecgen' -t 'codecgen generated' -o "values_codecgen${c5}" -d 19780 "$zfin" "$zfin2" &&
        cp mammoth2_generated_test.go $c9 &&
        $c8 -t 'codecgen,!notfastpath generated,!notfastpath' -o "mammoth2_codecgen${c5}" -d 19781 "mammoth2_generated_test.go" &&
        rm -f $c9 &&
        echo "generators done!" 
}

_prebuild() {
    echo "prebuild: zforce: $zforce"
    local d="$PWD"
    local zfin="test_values.generated.go"
    local zfin2="test_values_flex.generated.go"
    local zpkg="github.com/ugorji/go/codec"
    local returncode=1

    # zpkg=${d##*/src/}
    # zgobase=${d%%/src/*}
    # rm -f *_generated_test.go 
    rm -f codecgen-*.go &&
        _build &&
        cp $d/values_test.go $d/$zfin &&
        cp $d/values_flex_test.go $d/$zfin2 &&
        _codegenerators &&
        if [[ "$(type -t _codegenerators_external )" = "function" ]]; then _codegenerators_external ; fi &&
        if [[ $zforce ]]; then ${gocmd} install ${zargs[*]} .; fi &&
        returncode=0 &&
        echo "prebuild done successfully"
    rm -f $d/$zfin $d/$zfin2
    return $returncode
    # unset zfin zfin2 zpkg
}

_make() {
    local makeforce=${zforce}
    zforce=1
    (cd codecgen && ${gocmd} install ${zargs[*]} .) && _prebuild && ${gocmd} install ${zargs[*]} .
    zforce=${makeforce}
}

_clean() {
    rm -f \
       gen-from-tmpl.*generated.go \
       codecgen-*.go \
       test_values.generated.go test_values_flex.generated.go
}

_release() {
    local reply
    read -p "Pre-release validation takes a few minutes and MUST be run from within GOPATH/src. Confirm y/n? " -n 1 -r reply
    echo
    if [[ ! $reply =~ ^[Yy]$ ]]; then return 1; fi

    # expects GOROOT, GOROOT_BOOTSTRAP to have been set.
    if [[ -z "${GOROOT// }" || -z "${GOROOT_BOOTSTRAP// }" ]]; then return 1; fi
    # (cd $GOROOT && git checkout -f master && git pull && git reset --hard)
    (cd $GOROOT && git pull)
    local f=`pwd`/make.release.out
    cat > $f <<EOF
========== `date` ===========
EOF
    # # go 1.6 and below kept giving memory errors on Mac OS X during SDK build or go run execution,
    # # that is fine, as we only explicitly test the last 3 releases and tip (2 years).
    local makeforce=${zforce}
    zforce=1
    for i in 1.10 1.11 1.12 master
    do
        echo "*********** $i ***********" >>$f
        if [[ "$i" != "master" ]]; then i="release-branch.go$i"; fi
        (false ||
             (echo "===== BUILDING GO SDK for branch: $i ... =====" &&
                  cd $GOROOT &&
                  git checkout -f $i && git reset --hard && git clean -f . &&
                  cd src && ./make.bash >>$f 2>&1 && sleep 1 ) ) &&
            echo "===== GO SDK BUILD DONE =====" &&
            _prebuild &&
            echo "===== PREBUILD DONE with exit: $? =====" &&
            _tests "$@"
        if [[ "$?" != 0 ]]; then return 1; fi
    done
    zforce=${makeforce}
    echo "++++++++ RELEASE TEST SUITES ALL PASSED ++++++++"
}

_usage() {
    # hidden args:
    # -pf [p=prebuild (f=force)]
    
    cat <<EOF
primary usage: $0 
    -[tesow m n l d]   -> [t=tests (e=extra, s=short, o=cover, w=wait), m=make, n=inlining diagnostics, l=mid-stack inlining, d=race detector]
    -v                   -> v=verbose
EOF
    if [[ "$(type -t _usage_run)" = "function" ]]; then _usage_run ; fi
}

_main() {
    if [[ -z "$1" ]]; then _usage; return 1; fi
    local x # determines the main action to run in this build
    local zforce # force
    local zcover # generate cover profile and show in browser when done
    local zwait # run tests in sequence, not parallel ie wait for one to finish before starting another
    local zextra # means run extra (python based tests, etc) during testing
    
    local ztestargs=()
    local zargs=()
    local zverbose=()
    local zbenchflags=""

    local gocmd=${MYGOCMD:-go}
    
    OPTIND=1
    while getopts ":cetmnrgpfvlyzdsowxb:" flag
    do
        case "x$flag" in
            'xo') zcover=1 ;;
            'xe') zextra=1 ;;
            'xw') zwait=1 ;;
            'xf') zforce=1 ;;
            'xs') ztestargs+=("-short") ;;
            'xv') zverbose+=(1) ;;
            'xl') zargs+=("-gcflags"); zargs+=("-l=4") ;;
            'xn') zargs+=("-gcflags"); zargs+=("-m=2") ;;
            'xd') zargs+=("-race") ;;
            'xb') x='b'; zbenchflags=${OPTARG} ;;
            x\?) _usage; return 1 ;;
            *) x=$flag ;;
        esac
    done
    shift $((OPTIND-1))
    # echo ">>>> _main: extra args: $@"
    case "x$x" in
        'xt') _tests "$@" ;;
        'xm') _make "$@" ;;
        'xr') _release "$@" ;;
        'xg') _go ;;
        'xp') _prebuild "$@" ;;
        'xc') _clean "$@" ;;
        'xx') _analyze_checks "$@" ;;
        'xy') _analyze_debug_types "$@" ;;
        'xz') _analyze_do_inlining_and_more "$@" ;;
        'xb') _bench "$@" ;;
    esac
    # unset zforce zargs zbenchflags
}

[ "." = `dirname $0` ] && _main "$@"