"""Pure product-suite configuration and generation planning helpers."""

from __future__ import annotations

from collections import OrderedDict
import re


FIXED_CATEGORIES = ("白底图", "场景图", "模特场景图", "细节说明图", "卖点图")
FIXED_CATEGORY_HELPERS = {
    "白底图": "白底主图，多角度呈现商品细节",
    "场景图": "生活化场景展示商品使用方式",
    "模特场景图": "模特或手持场景展示商品真实使用",
    "细节说明图": "突出材质、做工和关键细节",
    "卖点图": "突出核心卖点和差异化优势",
}
FIXED_CATEGORY_DESCRIPTIONS = {
    "白底图": "生成 Shopee 台灣商品白底主圖，純白背景，商品清晰置中，不添加多餘文字。",
    "场景图": "生成生活化使用場景圖，展示商品在真實情境中的用途與氛圍，畫面自然可信。",
    "模特场景图": "生成模特或手持使用情境圖，畫面自然可信，商品為主角。",
    "细节说明图": "生成商品細節特寫說明圖，突出材質、做工、接口、紋理或關鍵細節。",
    "卖点图": "生成賣點詳解圖，使用繁體中文短文案呈現核心優勢，版面乾淨。",
}
DEFAULT_CATEGORY_COUNTS = OrderedDict(
    (
        ("白底图", 1),
        ("场景图", 2),
        ("模特场景图", 0),
        ("细节说明图", 0),
        ("卖点图", 2),
    )
)
PLATFORMS = ("Shopee", "Lazada", "TikTok Shop", "Amazon")
COUNTRIES = ("中国台湾", "新加坡", "马来西亚", "菲律宾", "泰国", "越南")
LANGUAGES = ("繁体中文", "简体中文", "英文", "泰文", "越南文")
RATIOS = ("1:1", "3:4", "4:3", "16:9", "9:16")
LAST_SETTING_KEYS = ("platform", "country", "language", "ratio")
MAX_CATEGORY_NAME_LENGTH = 10
MAX_GENERATION_COUNT_WITHOUT_CONFIRM = 16
PRODUCT_SUITE_PLACEHOLDERS = (
    "生成目标",
    "套图名称",
    "补充描述",
    "平台",
    "国家地区",
    "输出语言",
    "图片比例",
    "商品ID",
    "主参考图序号",
    "参考图规则",
    "商品卖点与要求",
    "尺寸与长图规则",
    "禁用内容规则",
    "价格信息规则",
    "尺码信息规则",
)
PRODUCT_SUITE_COMMON_REQUIRED_PLACEHOLDERS = (
    "图片比例",
    "参考图规则",
    "商品卖点与要求",
    "尺寸与长图规则",
    "禁用内容规则",
    "价格信息规则",
    "尺码信息规则",
)
PRODUCT_SUITE_REQUIRED_PLACEHOLDERS = (
    "生成目标",
    *PRODUCT_SUITE_COMMON_REQUIRED_PLACEHOLDERS,
)
PRODUCT_SUITE_LEGACY_REQUIRED_PLACEHOLDERS = (
    "套图名称",
    "补充描述",
    *PRODUCT_SUITE_COMMON_REQUIRED_PLACEHOLDERS,
)
PRODUCT_SUITE_READ_ONLY_RULE_PLACEHOLDERS = (
    "尺寸与长图规则",
    "禁用内容规则",
    "价格信息规则",
    "尺码信息规则",
)
PRODUCT_SUITE_SIZE_RULE = (
    "重要尺寸要求：最终输出必须严格符合所选比例的单张完整构图电商图，"
    "禁止海报长图、详情页长图和多宫格拼接版面。"
)
PRODUCT_SUITE_FORBIDDEN_CONTENT_RULE = (
    "重要禁用内容：禁止在画面中出现任何国旗、旗帜、国徽、地图轮廓、"
    "政治符号或类似国家/地区标识。"
)
PRODUCT_SUITE_PRICE_RULE = (
    "价格信息规则：除非用户明确提供价格、折扣或活动价，否则禁止自行添加"
    "价格、币别符号、折扣数字或促销金额。"
)
PRODUCT_SUITE_SIZE_INFO_RULE = (
    "尺码信息规则：除非用户或参考图明确提供尺码、尺寸或规格，否则禁止自行"
    "编造尺码、尺寸、适用身高体重等内容。"
)
_PRODUCT_SUITE_PLACEHOLDER_RE = re.compile(r"\{([^{}\r\n]+)\}")


class ProductSuitePromptError(ValueError):
    """Raised when a product-suite prompt template is invalid."""


def default_suite_settings():
    return {
        "platform": "Shopee",
        "country": "中国台湾",
        "language": "繁体中文",
        "ratio": "1:1",
        "per_image_primary": False,
        "categories": dict(DEFAULT_CATEGORY_COUNTS),
        "custom_category_order": [],
    }


def normalize_suite_settings(value=None):
    raw = dict(value or {}) if isinstance(value, dict) else {}
    normalized = default_suite_settings()
    normalized["platform"] = _choice(raw.get("platform"), PLATFORMS, "Shopee")
    normalized["country"] = _choice(raw.get("country"), COUNTRIES, "中国台湾")
    normalized["language"] = _choice(raw.get("language"), LANGUAGES, "繁体中文")
    normalized["ratio"] = _choice(raw.get("ratio"), RATIOS, "1:1")
    normalized["per_image_primary"] = bool(raw.get("per_image_primary", False))

    raw_categories = raw.get("categories") if isinstance(raw.get("categories"), dict) else {}
    categories = OrderedDict()
    for name, default_count in DEFAULT_CATEGORY_COUNTS.items():
        categories[name] = _count(raw_categories.get(name, default_count))
    requested_order = raw.get("custom_category_order")
    requested_order = requested_order if isinstance(requested_order, list) else []
    seen = set(FIXED_CATEGORIES)
    custom_order = []
    for candidate in list(requested_order) + list(raw_categories):
        name = str(candidate or "")
        if name in seen or suite_name_error(name, categories):
            continue
        seen.add(name)
        custom_order.append(name)
        categories[name] = _count(raw_categories.get(name, 1))
    normalized["categories"] = dict(categories)
    normalized["custom_category_order"] = custom_order
    return normalized


def last_suite_settings(value=None):
    normalized = normalize_suite_settings(value)
    return {key: normalized[key] for key in LAST_SETTING_KEYS}


def suite_name_error(name, existing=None, old_name=""):
    value = str(name or "")
    if not value.strip():
        return "分类名称不能为空"
    if value != value.strip() or any(character.isspace() for character in value):
        return "分类名称不能包含空格"
    if len(value) > MAX_CATEGORY_NAME_LENGTH:
        return "分类名称不能超过10个字"
    names = set(existing or ())
    if value in names and value != str(old_name or ""):
        return "分类名称已存在"
    return ""


def category_order(settings):
    normalized = normalize_suite_settings(settings)
    categories = normalized["categories"]
    custom = [
        name
        for name in normalized["custom_category_order"]
        if name in categories and name not in FIXED_CATEGORIES
    ]
    return list(FIXED_CATEGORIES) + custom


def category_helper(category):
    return FIXED_CATEGORY_HELPERS.get(str(category or ""), "")


def category_description(category):
    name = str(category or "").strip()
    fixed_description = FIXED_CATEGORY_DESCRIPTIONS.get(name)
    if fixed_description:
        return fixed_description
    if name:
        return "生成自定义分类图片：%s。" % name
    return "生成自定义分类图片。"


def suite_total_count(settings, image_count):
    normalized = normalize_suite_settings(settings)
    categories = normalized["categories"]
    base = sum(_count(categories.get(name, 0)) for name in category_order(normalized))
    if not normalized["per_image_primary"]:
        return base
    white_count = _count(categories.get("白底图", 0))
    other_count = max(0, base - white_count)
    return white_count + other_count * max(1, int(image_count or 0))


def product_suite_prompt_errors(template_text):
    text = str(template_text or "")
    errors = []
    if not text.strip():
        return ["套图提示词模板不能为空"]

    matches = list(_PRODUCT_SUITE_PLACEHOLDER_RE.finditer(text))
    remainder = _PRODUCT_SUITE_PLACEHOLDER_RE.sub("", text)
    if "{" in remainder or "}" in remainder:
        errors.append("模板包含未闭合花括号或不支持的字面花括号")

    names = [match.group(1) for match in matches]
    unknown = sorted(set(names) - set(PRODUCT_SUITE_PLACEHOLDERS))
    if unknown:
        errors.append("模板包含未知变量：%s" % "、".join("{%s}" % name for name in unknown))

    missing = [
        name
        for name in PRODUCT_SUITE_COMMON_REQUIRED_PLACEHOLDERS
        if name not in names
    ]
    if missing:
        errors.append("模板缺少必需变量：%s" % "、".join("{%s}" % name for name in missing))
    has_new_target = "生成目标" in names
    has_legacy_target = all(
        name in names for name in ("套图名称", "补充描述")
    )
    if not has_new_target and not has_legacy_target:
        errors.append(
            "模板缺少必需变量：{生成目标}（旧模板需同时包含{套图名称}和{补充描述}）"
        )

    invalid_rule_lines = []
    for line in text.splitlines():
        line_names = _PRODUCT_SUITE_PLACEHOLDER_RE.findall(line)
        for name in line_names:
            if (
                name in PRODUCT_SUITE_READ_ONLY_RULE_PLACEHOLDERS
                and line.strip() != "{%s}" % name
            ):
                invalid_rule_lines.append(name)
    if invalid_rule_lines:
        errors.append(
            "只读规则变量必须独占一行：%s"
            % "、".join("{%s}" % name for name in sorted(set(invalid_rule_lines)))
        )
    return errors


def validate_product_suite_prompt(template_text):
    errors = product_suite_prompt_errors(template_text)
    if errors:
        raise ProductSuitePromptError("；".join(errors))
    return str(template_text)


def reference_asset_count(settings, source_image_count):
    """Return the effective reference-image count for a planned cmhub request."""
    normalized = normalize_suite_settings(settings)
    if normalized["per_image_primary"]:
        return 0
    try:
        image_count = max(0, int(source_image_count or 0))
    except (TypeError, ValueError):
        image_count = 0
    return min(7, max(0, image_count - 1))


def product_suite_reference_rule(settings, reference_asset_count=0):
    normalized = normalize_suite_settings(settings)
    if normalized["per_image_primary"]:
        return (
            "参考图规则:当前上传图片是本任务唯一主参考图；保持商品主体、款式、颜色和关键细节准确；"
            "不编造用户与参考图均未提供的信息。"
        )
    return "参考图规则:使用第一張上傳圖作為主商品圖，其餘圖片只作為參考。"


def product_suite_prompt_context(
    base_prompt,
    settings,
    category,
    item_id,
    source_index=1,
    reference_asset_count=0,
):
    normalized = normalize_suite_settings(settings)
    item_text = str(item_id or "").strip()
    if not item_text or item_text.startswith("draft_"):
        item_text = "未绑定商品"
    reference_index = max(1, int(source_index or 1))
    reference_rule = product_suite_reference_rule(
        normalized,
        reference_asset_count,
    )
    return {
        "生成目标": category_description(category),
        "套图名称": str(category or ""),
        "补充描述": "，" + category_description(category),
        "平台": normalized["platform"],
        "国家地区": normalized["country"],
        "输出语言": normalized["language"],
        "图片比例": normalized["ratio"],
        "商品ID": item_text,
        "主参考图序号": str(reference_index),
        "参考图规则": reference_rule,
        "商品卖点与要求": str(base_prompt or "").strip(),
        "尺寸与长图规则": PRODUCT_SUITE_SIZE_RULE,
        "禁用内容规则": PRODUCT_SUITE_FORBIDDEN_CONTENT_RULE,
        "价格信息规则": PRODUCT_SUITE_PRICE_RULE,
        "尺码信息规则": PRODUCT_SUITE_SIZE_INFO_RULE,
    }


def render_product_suite_prompt(template_text, context):
    validate_product_suite_prompt(template_text)
    values = {
        name: str((context or {}).get(name, ""))
        for name in PRODUCT_SUITE_PLACEHOLDERS
    }
    context = context or {}
    missing_context = [
        name
        for name in PRODUCT_SUITE_COMMON_REQUIRED_PLACEHOLDERS
        if name not in context
    ]
    has_new_target = "生成目标" in context
    has_legacy_target = all(
        name in context for name in ("套图名称", "补充描述")
    )
    if not has_new_target and not has_legacy_target:
        missing_context.append("生成目标")
    if missing_context:
        raise ProductSuitePromptError(
            "提示词上下文缺少变量：%s"
            % "、".join("{%s}" % name for name in missing_context)
        )
    rendered = _PRODUCT_SUITE_PLACEHOLDER_RE.sub(
        lambda match: values[match.group(1)],
        str(template_text),
    )
    if "{" in rendered or "}" in rendered:
        raise ProductSuitePromptError("提示词渲染后仍有未替换变量")
    return rendered.strip()


def build_suite_prompt(
    base_prompt,
    settings,
    category,
    item_id,
    source_index=1,
    reference_asset_count=0,
    *,
    template_text,
):
    context = product_suite_prompt_context(
        base_prompt,
        settings,
        category,
        item_id,
        source_index=source_index,
        reference_asset_count=reference_asset_count,
    )
    return render_product_suite_prompt(template_text, context)


def build_job_specs(source_assets, base_prompt, settings, item_id, *, template_text):
    assets = list(source_assets or [])
    if not assets:
        return []
    normalized = normalize_suite_settings(settings)
    primary_asset_id = int(getattr(assets[0], "id", assets[0]))
    reference_asset_ids = []
    if not normalized["per_image_primary"]:
        for asset in assets[1:8]:
            asset_id = int(getattr(asset, "id", asset))
            if asset_id != primary_asset_id and asset_id not in reference_asset_ids:
                reference_asset_ids.append(asset_id)
    specs = []
    for category in category_order(normalized):
        count = _count(normalized["categories"].get(category, 0))
        if count <= 0:
            continue
        targets = assets if normalized["per_image_primary"] and category != "白底图" else assets[:1]
        for source_index, asset in enumerate(targets, 1):
            for category_index in range(1, count + 1):
                specs.append(
                    {
                        "source_asset_id": int(getattr(asset, "id", asset)),
                        "reference_asset_ids": list(reference_asset_ids),
                        "job_type": str(category),
                        "category": str(category),
                        "category_index": category_index,
                        "source_index": source_index,
                        "prompt": build_suite_prompt(
                            base_prompt,
                            normalized,
                            category,
                            item_id,
                            source_index=source_index,
                            reference_asset_count=len(reference_asset_ids),
                            template_text=template_text,
                        ),
                    }
                )
    return specs


def _count(value):
    try:
        return max(0, int(value or 0))
    except (TypeError, ValueError):
        return 0


def _choice(value, choices, default):
    text = str(value or "").strip()
    return text if text in choices else default