#!/bin/bash

function ChToScriptFileDir() {
    cd "$(dirname "$0")"
    if [ $? -ne 0 ]; then
        echo "cd to script file dir error"
        exit 1
    fi
}

function Help() {
    echo "-h get help"
    echo "-v set build version (default: dev)"
    echo "-w set web version (default: latest releases)"
    echo "-m set build mode (default: pie)"
    echo "-l set ldflags (default: -s -w --extldflags \"-static -fpic -Wl,-z,relro,-z,now\")"
    echo "-p set platform (default: linux/amd64,darwin/arm64)"
    echo "-P set trim path (default: disable)"
    echo "-b set build result dir (default: build)"
}

function Init() {
    VERSION="dev"
    WEB_VERSION=""
    commit="$(git log --pretty=format:"%h" -1)"
    if [ $? -ne 0 ]; then
        echo "git log error"
        GIT_COMMIT="unknown"
    else
        GIT_COMMIT="$commit"
    fi
    BUILD_MODE="pie"
    LDFLAGS='-s -w --extldflags "-static -fpic -Wl,-z,relro,-z,now"'
    PLATFORM="linux/amd64,darwin/arm64"
    TRIM_PATH=""
    BUILD_DIR="build"
}

function ParseArgs() {
    while getopts "hv:w:m:l:p:Pb:" arg; do
        case $arg in
        h)
            Help
            exit 0
            ;;
        v)
            VERSION="$OPTARG"
            ;;
        w)
            WEB_VERSION="$OPTARG"
            ;;
        m)
            BUILD_MODE="$OPTARG"
            ;;
        l)
            LDFLAGS="$OPTARG"
            ;;
        p)
            PLATFORM="$OPTARG"
            ;;
        P)
            TRIM_PATH="true"
            ;;
        b)
            BUILD_DIR="$OPTARG"
            ;;
        ?)
            echo "unkonw argument"
            exit 1
            ;;
        esac
    done
}

function GetLatestWebVersion() {
    while true; do
        LATEST=$(curl -sL https://api.github.com/repos/$1/releases/latest)
        if [ $? -ne 0 ]; then exit $?; fi
        if [ "$(echo "$LATEST" | grep -o "API rate limit exceeded")" ]; then
            echo "API rate limit exceeded"
            echo "sleep 5s"
            sleep 5
        elif [ "$(echo "$LATEST" | grep -o "Not Found")" ]; then
            echo "Not Found"
            exit 1
        else
            break
        fi
    done

    WEB_VERSION=$(echo "$LATEST" | grep -o '"tag_name": "[^"]*' | grep -o '[^"]*$')
}

# Comply with golang version rules
function CheckVersionFormat() {
    if [ "$1" == "dev" ]; then
        return 0
    fi
    if [ "$(echo "$1" | grep -oE "^v?[0-9]+\.[0-9]+\.[0-9]+$")" ]; then
        return 0
    fi
    return 1
}

function FixArgs() {
    CheckAllPlatform
    CheckVersionFormat "$VERSION"
    if [ $? -ne 0 ]; then
        echo "version format error"
        exit 1
    fi
    if [ ! "$WEB_VERSION" ]; then
        GetLatestWebVersion "synctv-org/synctv-web"
    fi
    LDFLAGS="$LDFLAGS \
        -X 'github.com/synctv-org/synctv/internal/conf.Version=$VERSION' \
        -X 'github.com/synctv-org/synctv/internal/conf.WebVersion=$WEB_VERSION' \
        -X 'github.com/synctv-org/synctv/internal/conf.GitCommit=$GIT_COMMIT'"

    BUILD_DIR="$(echo "$BUILD_DIR" | sed 's#/$##')"
}

function InitDep() {
    rm -rf public/dist/*
    echo "download: https://github.com/synctv-org/synctv-web/releases/download/${WEB_VERSION}/dist.tar.gz"
    curl -sL "https://github.com/synctv-org/synctv-web/releases/download/${WEB_VERSION}/dist.tar.gz" | tar --strip-components 1 -C "public/dist" -z -x -v -f -
}

ALLOWD_PLATFORM="linux/amd64,linux/arm64,darwin/amd64,darwin/arm64,windows/amd64,windows/arm64"

function CheckPlatform() {
    platform="$1"
    for p in $(echo "$ALLOWD_PLATFORM" | tr "," "\n"); do
        if [ "$p" == "$platform" ]; then
            return 0
        fi
    done
    return 1
}

function CheckAllPlatform() {
    for platform in $(echo "$PLATFORM" | tr "," "\n"); do
        CheckPlatform "$platform"
        if [ $? -ne 0 ]; then
            echo "platform $platform not allowd"
            exit 1
        fi
    done
}

function Build() {
    platform="$1"
    echo "build $platform"
    GOOS=${platform%/*}
    GOARCH=${platform#*/}
    if [ "$GOOS" == "windows" ]; then
        EXT=".exe"
    else
        EXT=""
    fi
    if [ "$TRIM_PATH" ]; then
        GOOS=$GOOS GOARCH=$GOARCH go build -trimpath -ldflags "$LDFLAGS" -o "$BUILD_DIR/$(basename $PWD)-$GOOS-$GOARCH$EXT" .
    else
        GOOS=$GOOS GOARCH=$GOARCH go build -ldflags "$LDFLAGS" -o "$BUILD_DIR/$(basename $PWD)-$GOOS-$GOARCH$EXT" .
    fi
}

function BuildAll() {
    for platform in $(echo "$PLATFORM" | tr "," "\n"); do
        Build "$platform"
    done
}

ChToScriptFileDir
Init
ParseArgs "$@"
FixArgs
InitDep
BuildAll