from __future__ import annotations


DEFAULT_STATUS_LABELS = {
    "open": "исполняет роль",
    "backstage": "в закулисье",
    "delay": "задержки",
    "rest": "антракт",
}

MARKDOWN_V2_SPECIALS = r"_*[]()~`>#+-=|{}.!"


def escape_markdown_v2(value: str) -> str:
    return "".join(f"\\{char}" if char in MARKDOWN_V2_SPECIALS else char for char in value)


def escape_markdown_v2_url(value: str) -> str:
    return value.replace("\\", "\\\\").replace(")", "\\)")


def build_hidden_link(config: dict) -> str:
    url = config.get("hidden_link_url", "").strip()
    if not url:
        return ""
    invisible = config.get("hidden_link_char", "\u2063")
    return f"[{invisible}]({escape_markdown_v2_url(url)})"


def build_actor_lines(config: dict, state: dict) -> str:
    actor_lines: list[str] = []
    actor_state = state.get("actors", {})
    status_labels = {**DEFAULT_STATUS_LABELS, **config.get("status_labels", {})}

    for actor in config["actors"]:
        current = actor_state.get(actor["key"], {})
        status = current.get("status", actor.get("default_status", "backstage"))
        phrase = current.get("phrase", actor.get("phrases", {}).get(status, ""))
        label = status_labels.get(status, status)
        display_name = actor.get("display_md", actor["display_name"])
        meta = actor.get("meta_md", actor["pronouns"])
        emoji = actor.get("emoji_md", actor.get("emoji", ""))

        line = (
            f"{emoji} "
            f"[{escape_markdown_v2(display_name)}]({escape_markdown_v2_url(actor['link'])}) "
            f"{escape_markdown_v2(meta)} "
            f"{escape_markdown_v2(label)}\\."
        )
        if phrase:
            line = f"{line}\n   {escape_markdown_v2(phrase)}"
        actor_lines.append(line)

    actor_lines.extend(config.get("static_actor_lines_md", []))
    return "\n".join(actor_lines)


def build_default_template(config: dict) -> str:
    blocks = []
    hidden = build_hidden_link(config)
    if hidden:
        blocks.append(hidden)

    for key in ("header", "intro_links", "projects_block", "actors_title"):
        value = config.get(key, "").strip()
        if value:
            blocks.append(escape_markdown_v2(value))

    blocks.append("{{actors}}")

    for key in ("legend", "footer"):
        value = config.get(key, "").strip()
        if value:
            blocks.append(escape_markdown_v2(value))

    return "\n\n".join(blocks)


def build_channel_text(config: dict, state: dict) -> str:
    template = state.get("template", {}).get("text") or config.get("template_text") or build_default_template(config)
    actors_block = build_actor_lines(config, state)
    hidden_link = build_hidden_link(config)

    text = template.replace("{{actors}}", actors_block)
    text = text.replace("{{hidden_link}}", hidden_link)

    if "{{hidden_link}}" not in template and hidden_link:
        text = f"{hidden_link}\n{text}"

    return text