#!/usr/bin/env fish

# Release script for fork tags. Computes the next -fork.N tag from the
# latest upstream version, has Crush update the README version string
# (amending HEAD), pushes the branch, tags, pushes the tag, then
# cross-compiles, packs with UPX, and uploads to the releases server.

set -l targets \
    linux/amd64 \
    linux/arm64 \
    darwin/amd64 \
    darwin/arm64 \
    windows/amd64 \
    freebsd/amd64

# UPX 5.x dropped macOS support; windows/amd64 is PE32 only and
# freebsd/amd64 is ELF32 only, so only Linux targets are packed.
set -l pack_targets \
    linux-amd64 \
    linux-arm64

# --- Guards ---

set -l branch (git symbolic-ref --short HEAD)
if test "$branch" != dev
    echo "Error: not on dev branch (on $branch)" >&2
    exit 1
end

if test (git status --porcelain=2 | wc -l) -ne 0
    echo "Error: git working tree is dirty" >&2
    exit 1
end

# --- Fetch tags ---

git tag -d nightly 2>/dev/null; or true
git fetch upstream --tags

# --- Compute next fork tag ---

set -l upstream_version (git tag -l "v*" | grep -v -- '-fork\.' | sort -V | tail -1; or echo v0.0.0)
set -l existing (git tag -l "$upstream_version-fork.*" | wc -l | string trim)
set -l next_num (math $existing + 1)
set -l tag "$upstream_version-fork.$next_num"

# --- Confirm creation ---

read -P "Create fork release $tag? [y/N] " confirm
if test "$confirm" != y -a "$confirm" != Y
    echo Aborted.
    exit 0
end

# --- Push branch (force because we amended) ---

git push --force-with-lease; or begin
    echo "Error: branch push failed" >&2
    exit 1
end

# --- Tag and push ---

git tag -a $tag; or begin
    echo "Error: tagging failed" >&2
    exit 1
end

git push soft $tag; or begin
    echo "Error: tag push failed — deleting local tag" >&2
    git tag -d $tag 2>/dev/null
    exit 1
end

echo "Released $tag"

# --- Cross-compile ---

set -l ldflags "-s -w -X git.secluded.site/crush/internal/version.Version=$tag"

rm -rf dist
mkdir -p dist

for target in $targets
    set -l os (echo $target | cut -d/ -f1)
    set -l arch (echo $target | cut -d/ -f2)
    set -l ext ""
    if test "$os" = windows
        set ext .exe
    end

    echo "Building $os/$arch..."
    env CGO_ENABLED=0 GOEXPERIMENT=greenteagc GOOS=$os GOARCH=$arch \
        go build -o "dist/crush-$tag-$os-$arch$ext" -ldflags "$ldflags"; or begin
        echo "Error: build failed for $os/$arch" >&2
        exit 1
    end
end

# --- Pack with UPX ---

for suffix in $pack_targets
    set -l bin "dist/crush-$tag-$suffix"
    if test -f "$bin"
        echo "Packing $suffix..."
        upx -q "$bin"
    end
end

# --- Upload ---

fish -c "release upload crush $tag --latest dist/*"

echo "Done — $tag built, packed, and uploaded."