# syntax=docker/dockerfile:1
#
# ReadStat (Evan Miller, MIT) compiled to WebAssembly for johnmcm.com's
# /spss-viewer: SPSS .sav/.zsav/.por, SAS .sas7bdat/.sas7bcat/.xpt and Stata
# .dta readers, with zlib for .zsav. The Emscripten image is pinned by
# version and digest, ReadStat by commit (see README.md).
#
#   ./build.ps1     (or)   docker build --target export --output type=local,dest=dist .

ARG EMSDK_IMAGE=emscripten/emsdk:6.0.10@sha256:e077d54e2b8970575ebc4f185ac1de0b95c05f2b266134d4ba27449af7aebf65
FROM ${EMSDK_IMAGE} AS build

ARG READSTAT_COMMIT=835b88c8c79d00fcd028c9cfa1226de2fd18be20
RUN git clone -q https://github.com/WizardMac/ReadStat /readstat \
 && git -C /readstat checkout -q ${READSTAT_COMMIT} \
 && test "$(git -C /readstat rev-parse HEAD)" = "${READSTAT_COMMIT}"

RUN embuilder build zlib

WORKDIR /build
COPY src/wrapper.c .
# The readers only: writers, the command-line tools, text schemas, tests and fuzzers are left out.
RUN mkdir -p /out \
 && SRCS="wrapper.c $(ls /readstat/src/*.c /readstat/src/spss/*.c /readstat/src/sas/*.c /readstat/src/stata/*.c | grep -v -e '_write\.c$' -e 'readstat_writer\.c$')" \
 && emcc -O2 -DHAVE_ZLIB=1 -sUSE_ZLIB=1 -I/readstat/src $SRCS -o /out/readstat.mjs \
    -sMODULARIZE=1 -sEXPORT_ES6=1 -sEXPORT_NAME=createReadStat \
    -sENVIRONMENT=web,worker,node \
    -sALLOW_MEMORY_GROWTH=1 \
    -sMAXIMUM_MEMORY=4294967296 \
    -sFILESYSTEM=0 \
    -sDYNAMIC_EXECUTION=0 \
    -sINCOMING_MODULE_JS_API=print,printErr,locateFile \
    -sEXPORTED_FUNCTIONS=_rs_input,_rs_reset,_rs_parse_catalog,_rs_parse,_rs_meta,_rs_rows,_rs_is_string,_rs_numbers,_rs_missing,_rs_offsets,_rs_text,_rs_text_length,_malloc,_free \
    -sEXPORTED_RUNTIME_METHODS=HEAPU8,HEAPF64,HEAPU32,UTF8ToString,stringToUTF8,lengthBytesUTF8

FROM scratch AS export
COPY --from=build /out/ /