#!/bin/sh
set -eu

# Top-level build script — builds all five HTML tools, cross-compiles
# zddc-server binaries, and (when invoked with --release) cuts a lockstep
# release that bumps every tool to the same version.
#
# Usage:
#   sh build.sh                      # dev build
#   sh build.sh --release            # stable cut, coordinated version
#   sh build.sh --release X.Y.Z      # stable cut, explicit version
#   sh build.sh --release alpha      # alpha channel cut
#   sh build.sh --release beta       # beta channel cut
#
# Lockstep convention: every release bumps all six artifacts (5 HTML tools
# + zddc-server) to the same version, even if a tool didn't change. The
# coordinated next-stable target is max(latest tag across all tools) + 1.
# Channel cuts (alpha/beta) follow the same lockstep — every tool's
# channel mirror is overwritten in step.

SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)

# Source build-lib.sh once at the top level so the helpers it provides
# (promote_zddc_server, write_zddc_server_stubs_all, verify_channel_links,
# _coordinated_next_stable) are in scope. Each tool's build.sh sources it
# again — that's a no-op on already-defined functions.
root_dir="$SCRIPT_DIR"
. "$SCRIPT_DIR/shared/build-lib.sh"

# --- Parse release args ----------------------------------------------------
RELEASE_FLAG="${1:-}"
RELEASE_ARG="${2:-}"
RELEASE_CHANNEL=""
RELEASE_VERSION=""

if [ "$RELEASE_FLAG" = "--release" ]; then
    case "$RELEASE_ARG" in
        alpha | beta)
            RELEASE_CHANNEL="$RELEASE_ARG"
            ;;
        '')
            RELEASE_CHANNEL="stable"
            RELEASE_VERSION=$(_coordinated_next_stable)
            echo "=== Lockstep stable release — coordinated version: v$RELEASE_VERSION ==="
            ;;
        *)
            _validate_semver "$RELEASE_ARG"
            RELEASE_CHANNEL="stable"
            RELEASE_VERSION="$RELEASE_ARG"
            echo "=== Lockstep stable release — explicit version: v$RELEASE_VERSION ==="
            ;;
    esac
fi

# Build the per-tool argument list. For stable lockstep cuts pass the
# explicit version so every tool agrees; for alpha/beta pass the channel
# name; for plain dev builds pass nothing.
TOOL_RELEASE_ARGS=""
if [ -n "$RELEASE_CHANNEL" ]; then
    if [ "$RELEASE_CHANNEL" = "stable" ]; then
        TOOL_RELEASE_ARGS="--release $RELEASE_VERSION"
    else
        TOOL_RELEASE_ARGS="--release $RELEASE_CHANNEL"
    fi
fi

echo "=== Building ZDDC tools ==="

# Each tool's compute_build_label writes a sidecar `<tool>.label` here so
# we can assemble zddc/internal/apps/embedded/versions.txt below.
BUILD_LABELS_DIR="$SCRIPT_DIR/zddc/internal/apps/embedded/.labels"
rm -rf "$BUILD_LABELS_DIR"
mkdir -p "$BUILD_LABELS_DIR"
export BUILD_LABELS_DIR

# shellcheck disable=SC2086 # intentional word-splitting on TOOL_RELEASE_ARGS
sh "$SCRIPT_DIR/transmittal/build.sh" $TOOL_RELEASE_ARGS
sh "$SCRIPT_DIR/archive/build.sh"     $TOOL_RELEASE_ARGS
sh "$SCRIPT_DIR/classifier/build.sh"  $TOOL_RELEASE_ARGS
sh "$SCRIPT_DIR/mdedit/build.sh"      $TOOL_RELEASE_ARGS
sh "$SCRIPT_DIR/landing/build.sh"     $TOOL_RELEASE_ARGS

echo ""
echo "=== Assembling zddc/dist/web/ ==="
# All five tool HTMLs ship inside the server bundle. landing and archive call
# server APIs (GET / for the project list, directory listings for archive) and
# are useless without zddc-server. transmittal, classifier, and mdedit are
# pure client-side tools but are still bundled — the server uses these copies
# as the embedded fallback (//go:embed in internal/apps/embedded/) when both
# the cache is empty AND the upstream is unreachable.
mkdir -p "$SCRIPT_DIR/zddc/dist/web"
cp "$SCRIPT_DIR/landing/dist/index.html"             "$SCRIPT_DIR/zddc/dist/web/index.html"
cp "$SCRIPT_DIR/archive/dist/archive.html"           "$SCRIPT_DIR/zddc/dist/web/archive.html"
cp "$SCRIPT_DIR/transmittal/dist/transmittal.html"   "$SCRIPT_DIR/zddc/dist/web/transmittal.html"
cp "$SCRIPT_DIR/classifier/dist/classifier.html"     "$SCRIPT_DIR/zddc/dist/web/classifier.html"
cp "$SCRIPT_DIR/mdedit/dist/mdedit.html"             "$SCRIPT_DIR/zddc/dist/web/mdedit.html"
echo "Wrote zddc/dist/web/{index,archive,transmittal,classifier,mdedit}.html"

# Mirror the same five HTMLs into the Go embed source dir so the next
# `go build` of zddc-server picks them up via //go:embed. Files are checked
# into git as empty placeholders; the build always overwrites them with the
# fresh dist/ output.
EMBED_DIR="$SCRIPT_DIR/zddc/internal/apps/embedded"
mkdir -p "$EMBED_DIR"
cp "$SCRIPT_DIR/landing/dist/index.html"             "$EMBED_DIR/index.html"
cp "$SCRIPT_DIR/archive/dist/archive.html"           "$EMBED_DIR/archive.html"
cp "$SCRIPT_DIR/transmittal/dist/transmittal.html"   "$EMBED_DIR/transmittal.html"
cp "$SCRIPT_DIR/classifier/dist/classifier.html"     "$EMBED_DIR/classifier.html"
cp "$SCRIPT_DIR/mdedit/dist/mdedit.html"             "$EMBED_DIR/mdedit.html"
echo "Populated $EMBED_DIR/ for //go:embed"

# Assemble the embedded versions manifest from the per-tool .label sidecars
# written by shared/build-lib.sh's compute_build_label. The Go side reads
# this via //go:embed in internal/apps/versions.go and surfaces it in
# `zddc-server --version` output and the startup log line.
VERSIONS_FILE="$EMBED_DIR/versions.txt"
{
    echo "# Generated by build.sh — do not edit. One <app>=<build label> per line."
    for _tool in archive transmittal classifier mdedit landing; do
        _label_file="$BUILD_LABELS_DIR/${_tool}.label"
        if [ -f "$_label_file" ]; then
            _label=$(cat "$_label_file")
        else
            _label=""
        fi
        printf '%s=%s\n' "$_tool" "$_label"
    done
} > "$VERSIONS_FILE"
echo "Wrote $VERSIONS_FILE"
rm -rf "$BUILD_LABELS_DIR"

# Cross-compiled zddc-server binaries for Linux/macOS/Windows. Always built
# inside docker.io/golang:1.24-alpine via podman (or docker), matching the
# helm/zddc-server-prod chart's `buildImage` so dev binaries are byte-for-byte
# what production gets. The build container is downloaded on first run.
echo ""
echo "=== Building zddc-server binaries (containerized) ==="
mkdir -p "$SCRIPT_DIR/zddc/dist"

# Pick a container runtime. Both work; podman is preferred (rootless default).
GO_RUNNER=""
if command -v podman >/dev/null 2>&1; then
    GO_RUNNER=podman
elif command -v docker >/dev/null 2>&1; then
    GO_RUNNER=docker
else
    echo "error: neither podman nor docker is available — cannot build zddc-server binaries." >&2
    echo "       Install podman (preferred) or docker. zddc-server build is containerized as policy." >&2
    exit 1
fi

GO_BUILD_IMAGE="${ZDDC_GO_BUILD_IMAGE:-docker.io/golang:1.24-alpine}"

# Cache the Go module + build cache across runs via named volumes that
# persist between container invocations. Second build is fast.
GO_MOD_VOL="${ZDDC_GO_MOD_VOL:-zddc-go-mod}"
GO_BUILD_VOL="${ZDDC_GO_BUILD_VOL:-zddc-go-cache}"

# Compute the binary's own version. On a stable cut, hard-code the
# coordinated version so the binary embeds the same string the rest of the
# release cycle has agreed on. Otherwise fall back to git describe (clean
# tag, or tag-N-gSHA[-dirty] for in-flight commits).
if [ -n "$RELEASE_VERSION" ]; then
    ZDDC_BINARY_VERSION="$RELEASE_VERSION"
else
    ZDDC_BINARY_VERSION=$(git -C "$SCRIPT_DIR" describe --tags --dirty --match 'zddc-server-v*' 2>/dev/null || true)
    if [ -z "$ZDDC_BINARY_VERSION" ]; then
        _sha=$(git -C "$SCRIPT_DIR" rev-parse --short=7 HEAD 2>/dev/null || echo unknown)
        if ! git -C "$SCRIPT_DIR" diff --quiet HEAD 2>/dev/null; then
            _sha="${_sha}-dirty"
        fi
        ZDDC_BINARY_VERSION="dev-${_sha}"
    fi
fi
echo "  binary version: $ZDDC_BINARY_VERSION"

# Single container invocation, multiple cross-compile targets inside a
# `for` loop — avoids paying image-startup overhead 4×.
"$GO_RUNNER" run --rm \
    -v "$SCRIPT_DIR:/src:Z" \
    -v "${GO_MOD_VOL}:/go/pkg/mod" \
    -v "${GO_BUILD_VOL}:/root/.cache/go-build" \
    -w /src/zddc \
    -e GOFLAGS=-mod=mod \
    -e CGO_ENABLED=0 \
    -e ZDDC_BINARY_VERSION="$ZDDC_BINARY_VERSION" \
    "$GO_BUILD_IMAGE" \
    sh -c '
        set -e
        for target in linux/amd64 darwin/amd64 darwin/arm64 windows/amd64; do
            os="${target%/*}"; arch="${target#*/}"
            out="zddc-server-${os}-${arch}"
            case "$os" in windows) out="${out}.exe" ;; esac
            echo "  building $out"
            GOOS="$os" GOARCH="$arch" \
                go build -trimpath \
                    -ldflags="-s -w -X main.version=${ZDDC_BINARY_VERSION}" \
                    -o "dist/$out" ./cmd/zddc-server
        done
    '

# Deploy directory for release artifacts. The website lives in a separate
# orphan branch served by Caddy from a fixed path; this directory is the
# worktree of that branch (default ~/src/zddc-website/releases). Override
# with $ZDDC_DEPLOY_RELEASES_DIR for testing or alternate deploy targets.
RELEASES_DIR="${ZDDC_DEPLOY_RELEASES_DIR:-$HOME/src/zddc-website/releases}"
mkdir -p "$RELEASES_DIR"

# --- Promote zddc-server release artifacts ---------------------------------
# On a release cut, copy the freshly cross-compiled binaries to
# website/releases/ under their canonical names + symlinks (lockstep with
# the HTML tools' release flow). On a plain build, just refresh stub pages
# from whatever artifacts already live in releases/.
if [ -n "$RELEASE_CHANNEL" ]; then
    echo ""
    echo "=== Promoting zddc-server $RELEASE_CHANNEL release ==="
    promote_zddc_server "$RELEASE_CHANNEL" "$RELEASE_VERSION" "$RELEASES_DIR" "$SCRIPT_DIR/zddc/dist"
else
    write_zddc_server_stubs_all "$RELEASES_DIR"
fi

# Latest stable version, by following archive_stable.html → versioned target.
# Returns "" if no stable cut exists yet (bootstrap state). All HTML tools
# move in lockstep so any one of them is a valid probe; archive is canonical.
_latest_stable_version() {
    _link="$RELEASES_DIR/archive_stable.html"
    [ -L "$_link" ] || return 0
    _target=$(readlink "$_link")
    # archive_v0.0.8.html → 0.0.8
    _v="${_target#archive_v}"
    _v="${_v%.html}"
    case "$_v" in
        [0-9]*.[0-9]*.[0-9]*) echo "$_v" ;;
    esac
}

# Channel "active" iff the channel mirror is real bytes rather than a
# symlink → stable. Used to surface alpha/beta in the dropdown only when
# they meaningfully differ from stable. Probes archive (HTML lockstep
# representative); zddc-server's probe is its per-platform binary.
_channel_is_active() {
    _ch="$1"  # alpha | beta
    _f="$RELEASES_DIR/archive_${_ch}.html"
    [ -L "$_f" ] && return 1   # symlink → tracks stable, not "active"
    [ -f "$_f" ] && return 0
    return 1
}

# Regenerate website/releases/index.html as the action-first install
# guide (not a matrix). The page guides users to either self-host the
# server or download individual tools, with one version dropdown that
# rewires every download link via JS. The default static state always
# uses latest-stable URLs so the page works fully without JS.
build_releases_index() {
    _out="$RELEASES_DIR/index.html"
    mkdir -p "$RELEASES_DIR"

    _latest=$(_latest_stable_version)
    if [ -z "$_latest" ]; then
        _latest="0.0.0"
    fi

    # All distinct stable versions across every tool, descending. Same
    # awk that the prior matrix used — proven across the tool naming.
    _all_versions=$(
        find "$RELEASES_DIR" -maxdepth 1 -type f \( \
            -name 'archive_v*.html' -o -name 'transmittal_v*.html' \
            -o -name 'classifier_v*.html' -o -name 'mdedit_v*.html' \
            -o -name 'landing_v*.html' \
            -o -name 'zddc-server_v*_linux-amd64' \
        \) 2>/dev/null \
        | awk -F/ '{
            n = split($NF, parts, "_v");
            if (n < 2) next;
            v = parts[2];
            sub(/\.html$/, "", v);
            sub(/_linux-amd64$/, "", v);
            if (v ~ /^[0-9]+\.[0-9]+\.[0-9]+$/) print v;
        }' \
        | sort -Vu \
        | sort -Vr
    )

    _alpha_active="0"; _channel_is_active alpha && _alpha_active="1"
    _beta_active="0";  _channel_is_active beta  && _beta_active="1"

    {
        cat <<HEAD
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Download ZDDC</title>
  <meta name="description" content="Self-host the ZDDC server, or download individual tools. Pin a version your project trusts; your archive's tools are yours.">
  <meta name="theme-color" content="#2a5a8a">
  <link rel="preconnect" href="https://fonts.googleapis.com">
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap" rel="stylesheet">
  <link rel="stylesheet" href="../css/style.css">
</head>
<body>
  <header class="site-header">
    <div class="container header-content">
      <a href="/" class="brand">
        <svg class="brand-logo" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" aria-hidden="true">
          <rect width="64" height="64" rx="12" fill="#1e3a5f"/>
          <g fill="#fff">
            <rect x="14" y="18" width="36" height="7"/>
            <polygon points="43,25 50,25 21,43 14,43"/>
            <rect x="14" y="43" width="36" height="7"/>
          </g>
        </svg>
        <span class="brand-name">ZDDC</span>
      </a>
      <nav class="header-nav">
        <a href="/" class="nav-link">Home</a>
        <a href="../reference.html" class="nav-link">Docs</a>
        <a href="index.html" class="nav-link active">Download</a>
      </nav>
    </div>
  </header>

  <section class="hero">
    <div class="container">
      <h1>Download ZDDC</h1>
      <p class="hero-subtitle">Pick how you want to use it. Pick the version you want. Every link below points at a real, immutable file you can save into your archive — your tools, your version, forever.</p>
    </div>
  </section>

  <main class="container" style="margin-bottom: var(--spacing-2xl);">
    <div class="version-picker-bar">
      <label for="version-picker">Showing</label>
      <select id="version-picker">
HEAD

        # Channels — selectable directly so users can copy the channel-
        # mirror URLs (e.g. archive_stable.html) for bookmarks. stable is
        # the default. The label tells the truth about the channel's
        # current state: when stable is set, show which version it points
        # at; when alpha/beta is just a symlink to stable, mark as
        # "tracks stable" so picking it isn't surprising.
        printf '        <optgroup label="Channels (mutable URLs)">\n'
        if [ -n "$_latest" ] && [ "$_latest" != "0.0.0" ]; then
            printf '          <option value="stable" selected>stable — currently v%s</option>\n' "$_latest"
        else
            printf '          <option value="stable" selected>stable</option>\n'
        fi
        if [ "$_beta_active" = "1" ]; then
            printf '          <option value="beta">beta — general testing</option>\n'
        else
            printf '          <option value="beta">beta — tracks stable</option>\n'
        fi
        if [ "$_alpha_active" = "1" ]; then
            printf '          <option value="alpha">alpha — active dev</option>\n'
        else
            printf '          <option value="alpha">alpha — tracks stable</option>\n'
        fi
        printf '        </optgroup>\n'

        # Pinned per-version, latest first. These are the immutable URLs
        # for reproducibility. No "(current stable)" suffix because the
        # stable channel above already covers that.
        printf '        <optgroup label="Pinned versions (immutable URLs)">\n'
        printf '%s\n' "$_all_versions" | while read -r _v; do
            [ -n "$_v" ] || continue
            printf '          <option value="v%s">v%s</option>\n' "$_v" "$_v"
        done
        printf '        </optgroup>\n'

        cat <<'PICKER_END'
      </select>
      <span class="picker-hint">Changes every download link below.</span>
    </div>

    <!-- ───────────── Path A — Self-host the server ───────────── -->
    <section class="card" style="background: var(--color-bg-subtle); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--spacing-lg) var(--spacing-xl); margin-top: var(--spacing-lg);">
      <h2 style="margin-top:0;">Path A — Self-host the server</h2>
      <p>One small Go binary. <strong>All five tools are baked in</strong> via <code>//go:embed</code>; the server picks the right one for each folder of your archive. Adds ACL via <code>.zddc</code> files, the virtual <code>.archive</code> document index, and SSO header passthrough. Stop the server and the directory is still a perfectly valid ZDDC archive — the server is convenience, not lock-in.</p>
PICKER_END

        # Render the download UI only when zddc-server has been published
        # at least once. Until then, show an honest "not yet released"
        # placeholder rather than dangling download buttons.
        _zs_published="0"
        if [ -e "$RELEASES_DIR/zddc-server_stable_linux-amd64" ]; then
            _zs_published="1"
        fi

        if [ "$_zs_published" = "1" ]; then
            # Default href is the channel-mirror URL (zddc-server_stable_<plat>)
            # because "stable" is the dropdown's selected option. Picking a
            # pinned version from the dropdown rewrites these to the
            # immutable per-version URL via the IIFE.
            printf '      <a class="dl-primary"\n'
            printf '         data-tool="zddc-server"\n'
            printf '         data-platform="linux-amd64"\n'
            printf '         href="zddc-server_stable_linux-amd64"\n'
            printf '         id="dl-primary-binary">\n'
            printf '        <span class="dl-icon">⬇</span>\n'
            printf '        <span>Download <span id="dl-primary-platlabel">for Linux (x86_64)</span></span>\n'
            printf '      </a>\n'
            printf '      <span class="dl-primary-meta" id="dl-primary-meta">zddc-server_stable_linux-amd64</span>\n'

            printf '      <div class="dl-secondary-row" id="dl-others">\n'
            printf '        <span>Other platforms:</span>\n'
            for _entry in "linux-amd64|Linux (x86_64)" \
                          "darwin-amd64|macOS (Intel)" \
                          "darwin-arm64|macOS (Apple Silicon)" \
                          "windows-amd64|Windows (x86_64)"; do
                _plat="${_entry%%|*}"
                _label="${_entry#*|}"
                _suffix=""
                case "$_plat" in *windows*) _suffix=".exe" ;; esac
                printf '        <a data-tool="zddc-server" data-platform="%s" href="zddc-server_stable_%s%s">%s</a>\n' \
                    "$_plat" "$_plat" "$_suffix" "$_label"
            done
            printf '      </div>\n'

            cat <<'PATH_A_END'
      <p style="margin-top: var(--spacing-md); font-size: 0.92rem; color: var(--color-text-muted);">
        After download: <code>chmod +x</code> the file, set <code>ZDDC_ROOT=/path/to/archive</code>, run.
        Need a different platform? <a href="https://codeberg.org/VARASYS/ZDDC">Build from source</a> at the matching tag.
      </p>
    </section>
PATH_A_END
        else
            # Bootstrap state: no zddc-server stable cut yet.
            cat <<'PATH_A_BOOTSTRAP'
      <p style="margin-top: var(--spacing-md); padding: var(--spacing-md); background: var(--color-bg); border-left: 3px solid var(--color-accent); border-radius: var(--radius-sm); color: var(--color-text);">
        <strong>Not yet published.</strong> The first lockstep release publishes binaries here. Until then, build from source: <code>git clone</code> and <code>(cd zddc && go build ./cmd/zddc-server)</code>. Once <code>sh build.sh --release</code> runs, this card auto-populates with download buttons for every platform.
      </p>
    </section>
PATH_A_BOOTSTRAP
        fi

        cat <<'PATH_B_OPEN'

    <!-- ───────────── Path B — Standalone tool HTMLs ───────────── -->
    <section class="card" style="border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--spacing-lg) var(--spacing-xl); margin-top: var(--spacing-xl);">
      <h2 style="margin-top:0;">Path B — Standalone tools</h2>
      <p>Every tool is a single self-contained HTML file. <strong>Open it locally and point it at a folder on your disk</strong> — no install, no server, no account. Same on-disk layout the server uses. Use one tool, use all five, mix and match — there is no orchestration to set up.</p>
      <div class="grid-4" style="margin-top: var(--spacing-md);">
PATH_B_OPEN

        # Tool cards — reuse home page's .tool-card vocabulary
        for _entry in "archive|Archive Browser|Browse and download from a ZDDC archive." \
                      "transmittal|Transmittal Creator|Build, sign, and verify transmittal packages." \
                      "classifier|Classifier|Rename loose files to ZDDC convention." \
                      "mdedit|Markdown Editor|Edit project markdown files in place." \
                      "landing|Landing|Project picker for multi-project servers."; do
            _t="${_entry%%|*}"
            _rest="${_entry#*|}"
            _name="${_rest%%|*}"
            _desc="${_rest#*|}"
            # Default href is the stable-channel mirror; the dropdown
            # rewires these per selection.
            printf '        <a class="tool-card" data-tool="%s" href="%s_stable.html">\n' "$_t" "$_t"
            printf '          <span class="tool-card__title">%s</span>\n' "$_name"
            printf '          <span class="tool-card__desc">%s</span>\n' "$_desc"
            printf '          <span class="tool-card__link">Download &rarr;</span>\n'
            printf '        </a>\n'
        done

        cat <<'PATH_B_END'
      </div>
    </section>

    <!-- ───────────── Pinning empowerment narrative ───────────── -->
    <section class="card" style="border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--spacing-lg) var(--spacing-xl); margin-top: var(--spacing-xl);">
      <h2 style="margin-top:0;">Your version, forever</h2>
      <p>Your server may run v0.0.8 next month and v0.1.0 the month after. <strong>Your project doesn't have to follow.</strong> If you depend on a specific behavior in <code>archive</code> v0.0.5, save that version into your archive — the next server upgrade can't take it away from you. Two ways to do it:</p>
      <div class="grid-2" style="margin-top: var(--spacing-md);">
        <div class="pin-card">
          <h3>Drop a copy into your archive</h3>
          <p>Save the tool's HTML at the path the server would serve it from. The server's resolution order picks up real files <em>first</em> — before any cascade or embedded fallback.</p>
PATH_B_END

        printf '          <pre>curl -o MyProject/archive.html \\\n  https://zddc.varasys.io/releases/archive_v%s.html</pre>\n' "$_latest"

        cat <<'PIN_MID'
          <p>Now <code>MyProject/archive.html</code> is yours. The server serves your bytes; nothing about a future <code>--release</code> can change them.</p>
        </div>
        <div class="pin-card">
          <h3>Pin via <code>.zddc</code></h3>
          <p>Less invasive — no copies in your archive, just a small config entry telling the server which version to fetch and cache. Closer-to-leaf wins, so subprojects can pin further.</p>
PIN_MID

        printf '          <pre># MyProject/.zddc\napps:\n  archive: v%s</pre>\n' "$_latest"

        cat <<'PIN_END'
          <p>Server fetches once on first hit, caches under <code>_app/</code>, falls through to the embedded copy if the fetch fails.</p>
        </div>
      </div>
      <p class="pin-note">Your archive's tools are <strong>yours</strong>. The server is convenience; deletion of the server doesn't break your archive — every per-version download above is a real, immutable static file. Save what you trust.</p>
    </section>

    <!-- ───────────── Channels explainer ───────────── -->
    <section class="card" style="border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--spacing-lg) var(--spacing-xl); margin-top: var(--spacing-xl); margin-bottom: var(--spacing-xl);">
      <h2 style="margin-top:0;">Channels</h2>
      <p>Three channels, applied in lockstep across all tools. Pre-release channels exist to soak changes; <strong>stable</strong> is what production runs.</p>
      <div class="channel-explainer">
        <div>
          <h4 class="alpha">alpha</h4>
          <p>Active dev iteration. Rebuilds without notice. Look here for the very latest.</p>
        </div>
        <div>
          <h4 class="beta">beta</h4>
          <p>Ready for general testing. Has soaked through alpha. Still mutable — pin to a versioned URL for reproducibility.</p>
        </div>
        <div>
          <h4 class="stable">stable</h4>
          <p>Ready to ship. Every per-version file is immutable; <code>_stable</code> follows the latest cut. Channel cuts cascade: stable cut resets beta and alpha to track stable.</p>
        </div>
      </div>
    </section>
  </main>

  <footer class="site-footer">
    <div class="container footer-content">
      <span>ZDDC is open source — <a href="https://codeberg.org/VARASYS/ZDDC">codeberg.org/VARASYS/ZDDC</a></span>
    </div>
  </footer>

  <script>
  (function() {
    // Platform auto-detect: choose the most likely binary for this user's
    // OS on first paint. Promotes that platform to the primary CTA; the
    // other three render in the secondary row. UA-sniffing is good
    // enough — wrong guesses fall through to the always-visible
    // "Other platforms" row below.
    var ua = navigator.userAgent || '';
    var detected = 'linux-amd64';   // sensible default
    var platLabel = 'Linux (x86_64)';
    if (/Macintosh|Mac OS X/.test(ua)) {
      // Apple Silicon vs Intel — UA hints aren't reliable, prefer arm64
      // since modern Macs are predominantly arm64. Users on Intel can
      // pick from "Other platforms".
      detected = 'darwin-arm64';
      platLabel = 'macOS (Apple Silicon)';
    } else if (/Windows/.test(ua)) {
      detected = 'windows-amd64';
      platLabel = 'Windows (x86_64)';
    }

    var primary = document.getElementById('dl-primary-binary');
    var primaryLabel = document.getElementById('dl-primary-platlabel');
    var primaryMeta = document.getElementById('dl-primary-meta');
    var others = document.getElementById('dl-others');

    function isChannel(v) {
      return v === 'stable' || v === 'beta' || v === 'alpha';
    }
    function platBinaryName(slug, plat) {
      // slug is a channel name ("stable") or a pinned version ("v0.0.8").
      // The on-disk name uses the slug as-is in both cases since the
      // channel-mirror filenames are zddc-server_<channel>_<plat> and
      // per-version are zddc-server_v<X.Y.Z>_<plat>.
      var suf = (plat.indexOf('windows') === 0) ? '.exe' : '';
      return 'zddc-server_' + slug + '_' + plat + suf;
    }
    function htmlAssetName(tool, slug) {
      return tool + '_' + slug + '.html';
    }

    // Promote the detected platform to the primary CTA. The secondary
    // row keeps all four; the matching one is hidden to avoid showing
    // the same download twice.
    if (primary) {
      primary.dataset.platform = detected;
      if (primaryLabel) primaryLabel.textContent = 'for ' + platLabel;
    }
    if (others) {
      others.querySelectorAll('a[data-platform="' + detected + '"]').forEach(function(a) {
        a.style.display = 'none';
      });
    }

    // Single source of truth: the dropdown's current value drives every
    // download link's href. Static markup ships with the stable-channel
    // mirror (`<tool>_stable.html`, `zddc-server_stable_<plat>`) so the
    // page works fully without JS — the JS just keeps things in sync
    // when the user picks a different channel or pins a version.
    var picker = document.getElementById('version-picker');
    if (!picker) return;

    function rewire(slug) {
      // slug ∈ {"stable", "beta", "alpha"} | "v<X.Y.Z>". Every link with
      // a data-tool attribute is a download URL the dropdown owns.
      document.querySelectorAll('[data-tool]').forEach(function(a) {
        var tool = a.dataset.tool;
        var plat = a.dataset.platform || '';
        if (tool === 'zddc-server') {
          a.href = plat ? platBinaryName(slug, plat) : ('zddc-server_' + slug + '.html');
        } else {
          a.href = htmlAssetName(tool, slug);
        }
      });
      if (primary && primaryMeta) {
        primaryMeta.textContent = primary.getAttribute('href');
      }
    }

    picker.addEventListener('change', function() { rewire(picker.value); });

    // Run rewire once on load to apply the platform-detection result
    // (the static href for the primary button is for linux-amd64; on a
    // non-linux client, that needs to flip to the detected platform).
    rewire(picker.value);
  })();
  </script>
</body>
</html>
PIN_END
    } > "$_out"
    echo "Wrote $_out"
}

echo ""
echo "=== Building releases/index.html ==="
build_releases_index

echo ""
echo "=== Verifying channel links ==="
verify_channel_links "$RELEASES_DIR"

echo ""
echo "=== All tools built successfully ==="
echo ""
if [ -n "$RELEASE_CHANNEL" ]; then
    echo "Release: $RELEASE_CHANNEL"
    if [ -n "$RELEASE_VERSION" ]; then
        echo "Version: v$RELEASE_VERSION"
        echo ""
        echo "Tags created (push together):"
        for _t in archive transmittal classifier mdedit landing zddc-server; do
            echo "  ${_t}-v${RELEASE_VERSION}"
        done
        echo ""
        echo "Publish: git push origin main && git push origin --tags"
    fi
else
    echo "Server deployment package: zddc/dist/"
    echo "  Binaries:  zddc-server-{linux,darwin,windows}-*"
    echo "  Web files: web/  (copy contents to ZDDC_ROOT)"
fi