#!/usr/bin/env bash
set -euo pipefail

for command in bun jq; do
    command -v "$command" >/dev/null || { printf 'Required command not found: %s\n' "$command" >&2; exit 1; }
done

checkout=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)
config="${OPENCODE_CONFIG_DIR:-${XDG_CONFIG_HOME:-$HOME/.config}/opencode}"
mkdir -p "$config"
config=$(cd "$config" && pwd -P)
mkdir -p "$config/plugins"
install=$(mktemp -d "$config/install.stanp-opencode.XXXXXXXX")
staged=""
backup=""
cleanup() {
    [[ -z "$install" ]] || rm -rf "$install"
    [[ -z "$staged" ]] || rm -rf "$staged"
}
trap cleanup EXIT

(cd "$checkout" && bun install --frozen-lockfile && bun run build)

bun -e '
    if (!await Bun.file(process.argv[1]).exists()) {
        throw new Error("Local build lacks the OpenCode V2 directory entrypoint.");
    }
    const { default: plugin } = await import(process.argv[1]);
    if (!plugin || plugin.id !== "stanp-opencode" || typeof plugin.setup !== "function") {
        throw new Error("Local build is not a native OpenCode V2 plugin.");
    }
    const tuiFile = Bun.file(process.argv[2]);
    const manifest = await Bun.file(process.argv[3]).json();
    const exportsTui = manifest?.exports?.["./tui"];
    if (!await tuiFile.exists() || !new Bun.Transpiler({ loader: "js" }).scan(await tuiFile.text()).exports.includes("default") || (typeof exportsTui !== "string" && typeof exportsTui?.import !== "string")) {
        throw new Error("Local build lacks the ChatGPT quota TUI plugin.");
    }
' "$checkout/dist/index.js" "$checkout/dist/tui.js" "$checkout/package.json"

config_file="$config/opencode.json"
config_source="$config_file"
if [[ ! -e "$config_source" ]]; then
    config_source="$install/empty-config.json"
    printf '{}\n' > "$config_source"
fi
jq -e '
    if type != "object" then error("opencode.json must contain an object") else . end
    | if (.plugins // []) | type != "array" then error("opencode.json plugins must be an array") else . end
    | .["$schema"] = (.["$schema"] // "https://opencode.ai/config.json")
    | .plugins = (.plugins // [])
    | if any(.plugins[]?; .package == "./plugins/stanp-opencode") then . else
        .plugins += [{
            package: "./plugins/stanp-opencode",
            options: { mode: "gpt", provider: "openai", lunaPriority: true }
        }]
      end
' "$config_source" > "$install/opencode.json"

target="$config/plugins/stanp-opencode"
staged="$config/plugins/.stanp-opencode.new.$$"
backup="$config/plugins/.stanp-opencode.old.$$"
mkdir "$staged"
cp "$checkout/dist/index.js" "$staged/index.js"
cp "$checkout/dist/tui.js" "$staged/tui.js"
cat > "$staged/package.json" <<'EOF'
{"name":"stanp-opencode","type":"module","main":"./index.js","exports":{".":"./index.js","./tui":"./tui.js"}}
EOF
if [[ -e "$target" || -L "$target" ]]; then mv "$target" "$backup"; fi
if ! mv "$staged" "$target"; then
    if [[ -e "$backup" || -L "$backup" ]]; then mv "$backup" "$target"; fi
    printf 'Could not activate plugin; installation unchanged\n' >&2
    exit 1
fi
staged=""
rm -rf "$backup"
backup=""
rm -f "$config/plugins/stanp-opencode.js"
mv "$install/opencode.json" "$config_file"
printf 'Built and installed stanp-opencode from %s into %s/plugins/stanp-opencode and updated %s\nRestart opencode2 to load it.\n' "$checkout" "$config" "$config_file"