from django.db import models

from core.enums import ClientFollowLogType
from core.models.base import UUIDPrimaryKeyModel


class ClientFollowLog(models.Model):
    """Partitioned table (PARTITION BY RANGE created_at).

    Managed via RunSQL; Django ORM treats parent as unmanaged.
    """

    id = models.UUIDField(
        primary_key=True,
        verbose_name="主键",
    )
    created_at = models.DateTimeField(
        verbose_name="创建时间",
        help_text="分区键",
    )
    client = models.ForeignKey(
        "fonrey_client.Client",
        on_delete=models.CASCADE,
        related_name="follow_logs",
        verbose_name="所属客源",
        help_text="跟进日志随客源级联删除",
    )

    log_type = models.CharField(
        max_length=30,
        choices=ClientFollowLogType.choices,
        verbose_name="跟进类型",
        help_text="written=写入跟进 / modified=修改跟进 / sensitive_view=敏感信息查看（不可删） / other=其他跟进 / system=系统日志",
    )
    purpose = models.CharField(
        max_length=50,
        blank=True,
        default="",
        verbose_name="跟进目的",
        help_text="lookup_items 维护，23项",
    )
    content = models.TextField(
        blank=True,
        default="",
        verbose_name="跟进内容",
        help_text="最少6字，最多500字",
    )
    log_tag = models.CharField(
        max_length=50,
        blank=True,
        default="",
        verbose_name="跟进标签",
        help_text="has_recording=有录音 / has_photo=有图片 / not_satisfied=对房源不满意 / still_considering=还在考虑 / ready_to_deposit=可交定金",
    )
    change_detail = models.JSONField(
        null=True,
        blank=True,
        verbose_name="字段变更明细",
        help_text='修改跟进专用，格式：{"field": "grade", "old": "C", "new": "B", "label": "等级"}',
    )

    is_public = models.BooleanField(
        default=True,
        verbose_name="是否公开",
        help_text="FALSE=仅本人及上级可见",
    )
    is_deletable = models.BooleanField(
        default=True,
        verbose_name="是否可删除",
        help_text="敏感信息查看类型为 FALSE，不可删除",
    )

    operator = models.ForeignKey(
        "org.Staff",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        verbose_name="操作人",
    )
    operator_snapshot = models.JSONField(
        null=True,
        blank=True,
        verbose_name="操作人快照",
        help_text="{name, store_group, role}（防止人员调动后显示异常）",
    )

    deleted_at = models.DateTimeField(
        null=True,
        blank=True,
        verbose_name="删除时间",
        help_text="仅 is_deletable=TRUE 时可软删",
    )

    class Meta:
        db_table = "client_follow_logs"
        verbose_name = "客源跟进日志"
        verbose_name_plural = "客源跟进日志"
        managed = False
        unique_together = (("id", "created_at"),)


class ClientFollowLogAttachment(UUIDPrimaryKeyModel):
    follow_log_id = models.UUIDField(
        verbose_name="所属跟进日志ID",
        help_text="跨分区 FK；不通过 Django FK 强制约束",
    )
    file_key = models.TextField(
        verbose_name="文件存储路径",
        help_text="R2/S3 存储路径",
    )
    file_name = models.CharField(
        max_length=255,
        verbose_name="文件名",
        help_text="原始文件名（用于展示和下载）",
    )
    file_size = models.IntegerField(
        verbose_name="文件大小",
        help_text="单位：bytes，最大 20MB",
    )
    file_type = models.CharField(
        max_length=10,
        blank=True,
        default="",
        verbose_name="文件类型",
        help_text="bmp / jpg / png / gif",
    )
    has_location = models.BooleanField(
        default=False,
        verbose_name="是否含位置信息",
        help_text="是否含 GPS 位置信息",
    )
    sort_order = models.SmallIntegerField(
        default=0,
        verbose_name="排序顺序",
    )
    created_at = models.DateTimeField(
        auto_now_add=True,
        verbose_name="创建时间",
    )

    class Meta:
        db_table = "client_follow_log_attachments"
        verbose_name = "客源跟进附件"
        verbose_name_plural = "客源跟进附件"
        indexes = [models.Index(fields=["follow_log_id"], name="idx_cfla_log")]