"""
可复用的 StreamField Block 库。
参见 documents/设计方案分析与完善版.md §2.6 组件清单。
"""
from django.utils.translation import gettext_lazy as _
from wagtail import blocks
from wagtail.images.blocks import ImageChooserBlock
from wagtail.snippets.blocks import SnippetChooserBlock


class CTAButtonBlock(blocks.StructBlock):
    text = blocks.CharBlock(max_length=50, label=_("按钮文案"))
    link = blocks.URLBlock(label=_("按钮链接"))

    class Meta:
        icon = "link"
        label = _("按钮")


class HeroBlock(blocks.StructBlock):
    title = blocks.CharBlock(max_length=120, label=_("标题"))
    subtitle = blocks.TextBlock(required=False, label=_("副标题"))
    background_image = ImageChooserBlock(required=False, label=_("背景图"))
    buttons = blocks.ListBlock(CTAButtonBlock(), label=_("按钮组"))

    class Meta:
        icon = "image"
        label = _("首屏 Hero")
        template = "core/blocks/hero_block.html"


class StatItemBlock(blocks.StructBlock):
    value = blocks.CharBlock(max_length=20, label=_("数值"))
    label = blocks.CharBlock(max_length=50, label=_("说明文字"))


class StatsBlock(blocks.StructBlock):
    items = blocks.ListBlock(StatItemBlock(), label=_("数据项"))

    class Meta:
        icon = "site"
        label = _("数据展示")
        template = "core/blocks/stats_block.html"


class FeatureBlock(blocks.StructBlock):
    icon = blocks.CharBlock(max_length=50, required=False, label=_("图标"))
    title = blocks.CharBlock(max_length=100, label=_("标题"))
    description = blocks.TextBlock(label=_("描述"))

    class Meta:
        icon = "pick"
        label = _("能力/优势")
        template = "core/blocks/feature_block.html"


class FeatureGridBlock(blocks.StructBlock):
    heading = blocks.CharBlock(max_length=100, required=False, label=_("模块标题"))
    items = blocks.ListBlock(FeatureBlock(), label=_("能力列表"))

    class Meta:
        icon = "grip"
        label = _("能力网格")


class FAQItemBlock(blocks.StructBlock):
    question = blocks.CharBlock(max_length=200, label=_("问题"))
    answer = blocks.RichTextBlock(label=_("回答"))


class FAQBlock(blocks.StructBlock):
    items = blocks.ListBlock(FAQItemBlock(), label=_("问答列表"))

    class Meta:
        icon = "help"
        label = _("常见问题")
        template = "core/blocks/faq_block.html"


class CTABlock(blocks.StructBlock):
    heading = blocks.CharBlock(max_length=120, label=_("标题"))
    description = blocks.TextBlock(required=False, label=_("描述"))
    button = CTAButtonBlock(label=_("按钮"))

    class Meta:
        icon = "plus"
        label = _("行动号召 CTA")
        template = "core/blocks/cta_block.html"


class LogoCloudBlock(blocks.StructBlock):
    heading = blocks.CharBlock(max_length=100, required=False, label=_("标题"))
    logos = blocks.ListBlock(ImageChooserBlock(), label=_("Logo 列表"))

    class Meta:
        icon = "image"
        label = _("客户 Logo 墙")
        template = "core/blocks/logo_cloud_block.html"


class CaseStudyBlock(blocks.StructBlock):
    case_page = blocks.PageChooserBlock(
        page_type="cases.CaseStudyPage", label=_("案例页面")
    )
    summary = blocks.CharBlock(max_length=250, required=False, label=_("摘要覆盖"))

    class Meta:
        icon = "doc-full"
        label = _("客户案例卡片")


class FormBlock(blocks.StructBlock):
    """嵌入可复用的线索表单（apps.forms.FormDefinition Snippet）。"""

    form = SnippetChooserBlock("forms.FormDefinition", label=_("选择表单"))

    class Meta:
        icon = "form"
        label = _("线索表单")

    def get_api_representation(self, value, context=None):
        """
        默认 SnippetChooserBlock 只会序列化为主键，前端渲染动态表单需要完整字段定义，
        因此这里手动展开 FormDefinition 及其子字段（详见 apps/forms/models.py）。
        """
        form_def = value.get("form")
        if form_def is None:
            return {"form": None}
        return {
            "form": {
                "id": form_def.pk,
                "name": form_def.name,
                "submit_button_text": form_def.submit_button_text,
                "success_message": form_def.success_message,
                "fields": [
                    {
                        "label": field.label,
                        "field_key": field.field_key,
                        "field_type": field.field_type,
                        "required": field.required,
                        "choices": [
                            choice.strip()
                            for choice in field.choices.split(",")
                            if choice.strip()
                        ],
                    }
                    for field in form_def.fields.all()
                ],
            }
        }



COMMON_BLOCKS = [
    ("hero", HeroBlock()),
    ("stats", StatsBlock()),
    ("feature_grid", FeatureGridBlock()),
    ("faq", FAQBlock()),
    ("cta", CTABlock()),
    ("logo_cloud", LogoCloudBlock()),
    ("case_study", CaseStudyBlock()),
    ("form", FormBlock()),
    ("richtext", blocks.RichTextBlock(label=_("富文本"))),
]