"""打印中心模型：PrintSettings（租户抬头）+ PrintTemplate（单据模板）。"""

from django.db import models

from apps.core.base_models import TenantScopedModel


class PrintSettings(TenantScopedModel):
    """租户打印抬头（单例：每租户一条，code 固定 default）。"""

    company_name = models.CharField(max_length=128, blank=True, default="")
    phone = models.CharField(max_length=64, blank=True, default="")
    address = models.CharField(max_length=255, blank=True, default="")
    bank_info = models.CharField(max_length=255, blank=True, default="", help_text="开户行/账号")
    footer_note = models.CharField(max_length=255, blank=True, default="", help_text="页脚备注（如：货已验收，概不退换）")
    logo_url = models.URLField(blank=True, default="")

    class Meta:
        db_table = "printing_settings"
        verbose_name_plural = "打印抬头"
        ordering = ["id"]

    def __str__(self):
        return f"{self.company_name or '未设置抬头'}"


class PrintTemplate(TenantScopedModel):
    """打印模板（用户可编辑的 HTML 片段，使用安全占位符语法）。

    doc_type: sales_bill / purchase_bill
    语法：{{path}} 取值、{{#each lines}}…{{/each}} 行循环（循环内用 {{item.xxx}}）。
    自研占位符渲染，不走 Django 模板引擎，杜绝模板注入。
    """

    DOC_TYPE_CHOICES = [
        ("sales_bill", "销售单/送货单"),
        ("purchase_bill", "采购单/进货单"),
    ]

    code = models.CharField(max_length=64, help_text="模板代码（租户内唯一）")
    name = models.CharField(max_length=128)
    doc_type = models.CharField(max_length=32, choices=DOC_TYPE_CHOICES)
    body_html = models.TextField(help_text="模板正文（安全占位符语法）")
    paper_size = models.CharField(max_length=16, default="A4")
    is_default = models.BooleanField(default=False, help_text="该单据类型的默认模板")

    class Meta:
        db_table = "printing_template"
        unique_together = [("tenant", "code")]
        verbose_name_plural = "打印模板"
        ordering = ["doc_type", "code"]

    def __str__(self):
        return f"[{self.doc_type}] {self.code}"