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#!/bin/bash
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# Copyright 2019 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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set -e
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shopt -s nullglob
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winerror="$(printf '%s\n' "/mnt/c/Program Files (x86)/Windows Kits/"/*/Include/*/shared/winerror.h | sort -Vr | head -n 1)"
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[[ -n $winerror ]] || { echo "Unable to find winerror.h" >&2; exit 1; }
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ntstatus="$(printf '%s\n' "/mnt/c/Program Files (x86)/Windows Kits/"/*/Include/*/shared/ntstatus.h | sort -Vr | head -n 1)"
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[[ -n $ntstatus ]] || { echo "Unable to find ntstatus.h" >&2; exit 1; }
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declare -A errors
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{
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	echo "// Code generated by 'mkerrors.bash'; DO NOT EDIT."
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	echo
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	echo "package windows"
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	echo "import \"syscall\""
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	echo "const ("
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	while read -r line; do
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		unset vtype
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		if [[ $line =~ ^#define\ +([A-Z0-9_]+k?)\ +([A-Z0-9_]+\()?([A-Z][A-Z0-9_]+k?)\)? ]]; then
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			key="${BASH_REMATCH[1]}"
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			value="${BASH_REMATCH[3]}"
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		elif [[ $line =~ ^#define\ +([A-Z0-9_]+k?)\ +([A-Z0-9_]+\()?((0x)?[0-9A-Fa-f]+)L?\)? ]]; then
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			key="${BASH_REMATCH[1]}"
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			value="${BASH_REMATCH[3]}"
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			vtype="${BASH_REMATCH[2]}"
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		elif [[ $line =~ ^#define\ +([A-Z0-9_]+k?)\ +\(\(([A-Z]+)\)((0x)?[0-9A-Fa-f]+)L?\) ]]; then
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			key="${BASH_REMATCH[1]}"
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			value="${BASH_REMATCH[3]}"
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			vtype="${BASH_REMATCH[2]}"
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		else
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			continue
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		fi
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		[[ -n $key && -n $value ]] || continue
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		[[ -z ${errors["$key"]} ]] || continue
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		errors["$key"]="$value"
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		if [[ -v vtype ]]; then
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			if [[ $key == FACILITY_* || $key == NO_ERROR ]]; then
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				vtype=""
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			elif [[ $vtype == *HANDLE* || $vtype == *HRESULT* ]]; then
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				vtype="Handle"
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			else
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				vtype="syscall.Errno"
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			fi
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			last_vtype="$vtype"
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		else
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			vtype=""
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			if [[ $last_vtype == Handle && $value == NO_ERROR ]]; then
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				value="S_OK"
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			elif [[ $last_vtype == syscall.Errno && $value == NO_ERROR ]]; then
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				value="ERROR_SUCCESS"
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			fi
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		fi
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		echo "$key $vtype = $value"
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	done < "$winerror"
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	while read -r line; do
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		[[ $line =~ ^#define\ (STATUS_[^\s]+)\ +\(\(NTSTATUS\)((0x)?[0-9a-fA-F]+)L?\) ]] || continue
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		echo "${BASH_REMATCH[1]} NTStatus = ${BASH_REMATCH[2]}"
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	done < "$ntstatus"
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	echo ")"
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} | gofmt > "zerrors_windows.go"
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