#!/bin/sh
# apply-overlay.sh — Wild Dragon reskin applied to a freshly cloned
# datarhei/restreamer-ui tree. Two phases:
#
#   1. File overlay: cp the contents of $OVERLAY/{public,src} on top of
#      the upstream working tree. Whole-file replacements only — simple
#      and idempotent. Modified views (Edit/index.js, Main/index.js) and
#      all new components (WHEP.js, WHEPStatus.js, Logo/) live here.
#
#   2. Targeted awk patches for one-line UI strings that aren't worth a
#      whole-file overlay (the header title, welcome strings). Each
#      pattern is anchored to unique surrounding context so a future
#      upstream rename fails loudly rather than silently no-op'ing.
#
# Caller: the Dockerfile ui-builder stage. Expects:
#   $OVERLAY = /overlay   (repo overlay/ COPYd into the build)
#   $UI      = /ui        (cloned upstream source root)
#
# Idempotent on a single source tree (re-running is a no-op).

set -eu

OVERLAY="${OVERLAY:-/overlay}"
UI="${UI:-/ui}"

echo "wilddragon-overlay: layering $OVERLAY -> $UI"

# Phase 1 — file copies. -L follows symlinks, -p preserves perms,
# -R recursive. --delete is intentionally omitted: the upstream tree
# stays intact except for the files we override.
for sub in public src; do
    if [ -d "$OVERLAY/$sub" ]; then
        cp -RLp "$OVERLAY/$sub/." "$UI/$sub/"
    fi
done

# Phase 2 — targeted awk patches. Fails loudly if the needle is missing
# (upstream changed the patched line).
patch_line() {
    file="$1"; needle="$2"; replacement="$3"
    if ! grep -qF "$needle" "$file"; then
        echo "wilddragon-overlay: ERROR — pattern not found in $file:"
        echo "  $needle"
        exit 1
    fi
    tmp="$(mktemp)"
    awk -v n="$needle" -v r="$replacement" '
        index($0, n) { sub(n, r); }
        { print }
    ' "$file" > "$tmp"
    mv "$tmp" "$file"
    echo "wilddragon-overlay: patched $(basename "$file") — $needle -> $replacement"
}

patch_line "$UI/src/Header.js" \
    '<Typography className="headerTitle">Restreamer</Typography>' \
    '<Typography className="headerTitle">Wild Dragon</Typography>'

patch_line "$UI/src/views/Welcome.js" \
    'title="Welcome to Restreamer v2"' \
    'title="Welcome to Wild Dragon"'

patch_line "$UI/src/views/Settings.js" \
    'title="Welcome to Restreamer v2"' \
    'title="Welcome to Wild Dragon"'

echo "wilddragon-overlay: done."