from __future__ import annotations

from typing import Any

TEXT_CHUNK_LIMIT = 30000
CARD_CONTENT_LIMIT = 30000

CARD_TEMPLATE_COLORS = {
    "blue",
    "green",
    "red",
    "orange",
    "purple",
    "indigo",
    "wathet",
    "turquoise",
    "yellow",
    "grey",
    "carmine",
    "violet",
    "lime",
}

PRESENTATION_TONE_MAP = {
    "default": "blue",
    "danger": "red",
    "warning": "orange",
    "success": "green",
}

BUTTON_TYPE_MAP = {
    "primary": "primary",
    "danger": "danger",
    "default": "default",
    "": "default",
}

SELECTOR_TAGS = {
    "select_static",
    "select_person",
    "date_picker",
    "time_picker",
    "datetime_picker",
    "overflow",
}


def resolve_template_color(template: str | None = None, tone: str | None = None) -> str:
    if template and template in CARD_TEMPLATE_COLORS:
        return template
    if tone and tone in PRESENTATION_TONE_MAP:
        return PRESENTATION_TONE_MAP[tone]
    return "blue"


def resolve_button_type(style: str | None = None) -> str:
    if not style:
        return "default"
    return BUTTON_TYPE_MAP.get(style, "default")


def resolve_selector_tag(tag: str) -> str:
    return tag if tag in SELECTOR_TAGS else "select_static"


def _build_plain_text(content: str) -> dict[str, Any]:
    return {"tag": "plain_text", "content": content}


def _build_options(options: list[dict[str, str]]) -> list[dict[str, Any]]:
    return [{"text": _build_plain_text(opt.get("text", "")), "value": opt.get("value", "")} for opt in options]


def make_select_static(
    placeholder: str = "",
    options: list[dict[str, str]] | None = None,
    value: str = "",
    initial_option: str = "",
) -> dict[str, Any]:
    sel: dict[str, Any] = {"tag": "select_static"}
    if placeholder:
        sel["placeholder"] = _build_plain_text(placeholder)
    if options:
        sel["options"] = _build_options(options)
    if value:
        sel["value"] = value
    if initial_option:
        sel["initial_option"] = initial_option
    return sel


def make_select_person(
    placeholder: str = "",
    value: str = "",
) -> dict[str, Any]:
    sel: dict[str, Any] = {"tag": "select_person"}
    if placeholder:
        sel["placeholder"] = _build_plain_text(placeholder)
    if value:
        sel["value"] = value
    return sel


def make_date_picker(
    placeholder: str = "",
    value: str = "",
    initial_date: str = "",
) -> dict[str, Any]:
    sel: dict[str, Any] = {"tag": "date_picker"}
    if placeholder:
        sel["placeholder"] = _build_plain_text(placeholder)
    if value:
        sel["value"] = value
    if initial_date:
        sel["initial_date"] = initial_date
    return sel


def make_time_picker(
    placeholder: str = "",
    value: str = "",
    initial_time: str = "",
) -> dict[str, Any]:
    sel: dict[str, Any] = {"tag": "time_picker"}
    if placeholder:
        sel["placeholder"] = _build_plain_text(placeholder)
    if value:
        sel["value"] = value
    if initial_time:
        sel["initial_time"] = initial_time
    return sel


def make_datetime_picker(
    placeholder: str = "",
    value: str = "",
    initial_datetime: str = "",
) -> dict[str, Any]:
    sel: dict[str, Any] = {"tag": "datetime_picker"}
    if placeholder:
        sel["placeholder"] = _build_plain_text(placeholder)
    if value:
        sel["value"] = value
    if initial_datetime:
        sel["initial_datetime"] = initial_datetime
    return sel


def make_overflow_menu(
    options: list[dict[str, str]] | None = None,
    value: str = "",
) -> dict[str, Any]:
    sel: dict[str, Any] = {"tag": "overflow"}
    if options:
        sel["options"] = _build_options(options)
    if value:
        sel["value"] = value
    return sel


def make_input_field(
    placeholder: str = "",
    value: str = "",
    multiline: bool = False,
    max_length: int = 0,
) -> dict[str, Any]:
    field: dict[str, Any] = {"tag": "input"}
    if placeholder:
        field["placeholder"] = _build_plain_text(placeholder)
    if value:
        field["value"] = value
    if multiline:
        field["multiline"] = True
    if max_length:
        field["max_length"] = max_length
    return field


def make_checkbox_group(
    options: list[dict[str, str]] | None = None,
    values: list[str] | None = None,
) -> dict[str, Any]:
    group: dict[str, Any] = {"tag": "checkbox"}
    if options:
        group["options"] = _build_options(options)
    if values:
        group["value"] = values
    return group


def make_image_element(img_key: str, alt_text: str = "") -> dict[str, Any]:
    return {
        "tag": "img",
        "img_key": img_key,
        "alt": _build_plain_text(alt_text),
    }


def build_feishu_text_content(content: str) -> dict[str, Any]:
    return {"text": content}


def build_feishu_post_content(content: str) -> dict[str, Any]:
    md_lines = content.split("\n")
    paragraphs: list[list[dict[str, Any]]] = []
    for line in md_lines:
        if not line.strip():
            paragraphs.append([{"tag": "text", "text": ""}])
        else:
            paragraphs.append([{"tag": "md", "text": line}])
    return {"zh_cn": {"content": paragraphs}}


def is_post_format_requested(metadata: dict | None = None) -> bool:
    if not metadata:
        return False
    return metadata.get("use_post_format", False) or metadata.get("usePostFormat", False)


def _truncate_card_content(content: str, limit: int = CARD_CONTENT_LIMIT) -> str:
    if len(content) <= limit:
        return content
    suffix = "\n\n...(内容过长已截断)"
    return content[: limit - len(suffix)] + suffix


def build_feishu_card(
    content: str,
    *,
    title: str = "AI 助手",
    buttons: list[dict[str, str]] | None = None,
    streaming: bool = False,
    url_unfurl: list[str] | None = None,
    images: list[str] | None = None,
    files: list[dict[str, str]] | None = None,
    note: str | None = None,
    template: str | None = None,
    tone: str | None = None,
    context_text: str | None = None,
    dividers: int = 0,
    selectors: list[dict[str, Any]] | None = None,
    visible_to_operator: bool = False,
) -> dict[str, Any]:
    elements: list[dict[str, Any]] = []

    if context_text:
        elements.append(
            {
                "tag": "note",
                "elements": [_build_plain_text(context_text)],
            }
        )

    for _ in range(dividers):
        elements.append({"tag": "hr"})

    if images:
        for img_key in images:
            elements.append(make_image_element(img_key))

    truncated_content = _truncate_card_content(content)
    elements.append({"tag": "markdown", "content": truncated_content})

    if files:
        for f in files:
            name = f.get("name", "文件")
            url = f.get("url", "")
            link = f"[📎 {name}]({url})" if url else f"📎 {name}"
            elements.append({"tag": "markdown", "content": link})

    if selectors:
        for sel in selectors:
            selector_tag = resolve_selector_tag(sel.get("tag", "select_static"))
            selector_element: dict[str, Any] = {"tag": selector_tag}
            if "placeholder" in sel:
                if isinstance(sel["placeholder"], dict):
                    selector_element["placeholder"] = sel["placeholder"]
                else:
                    selector_element["placeholder"] = _build_plain_text(str(sel["placeholder"]))
            if "options" in sel:
                selector_element["options"] = _build_options(sel["options"])
            for key in ("value", "initial_option", "initial_date", "initial_time", "initial_datetime"):
                if key in sel:
                    selector_element[key] = sel[key]
            elements.append(selector_element)

    if buttons:
        actions: list[dict[str, Any]] = []
        for btn in buttons:
            btn_type = resolve_button_type(btn.get("style"))
            actions.append(
                {
                    "tag": "button",
                    "text": _build_plain_text(btn.get("text", "")),
                    "type": btn_type,
                    "value": {"action": btn.get("action", "")},
                }
            )
        elements.append({"tag": "action", "actions": actions})

    if url_unfurl:
        for url in url_unfurl:
            elements.append({"tag": "markdown", "content": f"[🔗 {url}]({url})"})

    if note:
        elements.append(
            {
                "tag": "note",
                "elements": [_build_plain_text(note)],
            }
        )

    header_title = f"{title} (回复中...)" if streaming else title
    color = resolve_template_color(template, tone)

    card: dict[str, Any] = {
        "header": {
            "title": _build_plain_text(header_title),
            "template": color,
        },
        "elements": elements,
    }

    if visible_to_operator:
        card["config"] = {"update_multi": False}

    return card