"""
线索表单：FormDefinition 是可复用的表单定义 Snippet，通过 core.blocks.FormBlock
嵌入任意 StreamField 页面；提交结果保存为 Lead。
详见 documents/设计方案分析与完善版.md §2.6（FormBlock）与 B2B 官网核心转化路径。
"""
from django.db import models
from modelcluster.fields import ParentalKey
from modelcluster.models import ClusterableModel
from wagtail.admin.panels import FieldPanel, InlinePanel
from wagtail.models import Orderable
from wagtail.snippets.models import register_snippet

FIELD_TYPE_CHOICES = [
    ("text", "单行文本"),
    ("textarea", "多行文本"),
    ("email", "邮箱"),
    ("tel", "电话"),
    ("select", "下拉选择"),
]


@register_snippet
class FormDefinition(ClusterableModel):
    """可复用的线索表单定义。"""

    name = models.CharField(max_length=100, verbose_name="表单名称")
    submit_button_text = models.CharField(
        max_length=50, default="提交", verbose_name="提交按钮文案"
    )
    success_message = models.CharField(
        max_length=200,
        default="提交成功，我们会尽快与您联系。",
        verbose_name="提交成功提示",
    )
    notification_email = models.EmailField(blank=True, verbose_name="通知邮箱")

    panels = [
        FieldPanel("name"),
        FieldPanel("submit_button_text"),
        FieldPanel("success_message"),
        FieldPanel("notification_email"),
        InlinePanel("fields", label="表单字段"),
    ]

    class Meta:
        verbose_name = "线索表单"
        verbose_name_plural = "线索表单"

    def __str__(self):
        return self.name


class FormDefinitionField(Orderable):
    """FormDefinition 的子字段，编辑器在后台可自由增删排序。"""

    form = ParentalKey(
        FormDefinition, on_delete=models.CASCADE, related_name="fields"
    )
    label = models.CharField(max_length=100, verbose_name="字段标签")
    field_key = models.SlugField(
        max_length=50,
        verbose_name="字段标识",
        help_text="提交数据中使用的 key，例如 name / email / phone",
    )
    field_type = models.CharField(
        max_length=20, choices=FIELD_TYPE_CHOICES, default="text", verbose_name="字段类型"
    )
    required = models.BooleanField(default=True, verbose_name="是否必填")
    choices = models.CharField(
        max_length=255,
        blank=True,
        verbose_name="可选项",
        help_text="逗号分隔，仅“下拉选择”类型使用",
    )

    panels = [
        FieldPanel("label"),
        FieldPanel("field_key"),
        FieldPanel("field_type"),
        FieldPanel("required"),
        FieldPanel("choices"),
    ]


@register_snippet
class Lead(models.Model):
    """表单提交产生的线索记录，供销售/市场团队在后台查看。"""

    form = models.ForeignKey(
        FormDefinition,
        on_delete=models.SET_NULL,
        null=True,
        related_name="leads",
        verbose_name="来源表单",
    )
    data = models.JSONField(default=dict, verbose_name="提交数据")
    source_url = models.URLField(blank=True, verbose_name="来源页面")
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="提交时间")

    panels = [
        FieldPanel("form"),
        FieldPanel("data"),
        FieldPanel("source_url"),
    ]

    class Meta:
        verbose_name = "线索"
        verbose_name_plural = "线索"
        ordering = ["-created_at"]

    def __str__(self):
        form_name = self.form.name if self.form_id else "(表单已删除)"
        return f"{form_name} - {self.created_at:%Y-%m-%d %H:%M}"