from django.contrib.postgres.fields import ArrayField
from django.db import models

from core.enums import (
    ClientPropertyMatchGroup,
    ClientPropertyMatchSource,
    ClientPropertyMatchStatus,
    ClientStatusLogChangeType,
    ClientViewingIntent,
    ClientViewingType,
)
from core.models.base import UUIDPrimaryKeyModel


class ClientViewing(UUIDPrimaryKeyModel):
    client = models.ForeignKey(
        "fonrey_client.Client", on_delete=models.RESTRICT, related_name="viewings"
    )
    property = models.ForeignKey(
        "fonrey_property.Property",
        on_delete=models.RESTRICT,
        related_name="client_viewings",
    )
    viewing_type = models.CharField(
        max_length=20, choices=ClientViewingType.choices, default=ClientViewingType.VIEWING
    )

    agent = models.ForeignKey(
        "org.Staff",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="led_viewings",
    )
    companion_ids = ArrayField(models.UUIDField(), blank=True, default=list)
    cooperator_ids = ArrayField(models.UUIDField(), blank=True, default=list)

    scheduled_at = models.DateTimeField(null=True, blank=True)
    viewing_start_at = models.DateTimeField(null=True, blank=True)
    viewing_end_at = models.DateTimeField(null=True, blank=True)

    situation = models.TextField(blank=True, default="")
    client_intent = models.CharField(
        max_length=20, choices=ClientViewingIntent.choices, blank=True, default=""
    )
    viewing_progress = models.SmallIntegerField(null=True, blank=True)

    created_at = models.DateTimeField(auto_now_add=True)
    deleted_at = models.DateTimeField(null=True, blank=True)
    created_by = models.ForeignKey(
        "org.Staff",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="created_client_viewings",
    )

    class Meta:
        db_table = "client_viewings"
        verbose_name = "带看记录"
        verbose_name_plural = "带看记录"
        indexes = [
            models.Index(
                fields=["client", "-viewing_start_at"], name="idx_cv_client_time"
            ),
            models.Index(fields=["property"], name="idx_cv_property"),
            models.Index(fields=["agent"], name="idx_cv_agent"),
        ]


class ClientPropertyMatch(UUIDPrimaryKeyModel):
    client = models.ForeignKey(
        "fonrey_client.Client", on_delete=models.CASCADE, related_name="property_matches"
    )
    property = models.ForeignKey(
        "fonrey_property.Property",
        on_delete=models.CASCADE,
        related_name="client_matches",
    )

    match_source = models.CharField(
        max_length=20,
        choices=ClientPropertyMatchSource.choices,
        default=ClientPropertyMatchSource.RECORDED,
    )
    match_group = models.CharField(
        max_length=30, choices=ClientPropertyMatchGroup.choices, blank=True, default=""
    )
    match_score = models.DecimalField(
        max_digits=5, decimal_places=2, null=True, blank=True
    )
    match_reasons = models.JSONField(null=True, blank=True)

    status = models.CharField(
        max_length=20,
        choices=ClientPropertyMatchStatus.choices,
        default=ClientPropertyMatchStatus.SUGGESTED,
    )
    shared_at = models.DateTimeField(null=True, blank=True)
    feedback = models.CharField(max_length=50, blank=True, default="")
    calculated_at = models.DateTimeField(auto_now_add=True)
    created_by = models.ForeignKey(
        "org.Staff",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="created_matches",
    )

    class Meta:
        db_table = "client_property_matches"
        verbose_name = "智能配房"
        verbose_name_plural = "智能配房"
        constraints = [
            models.UniqueConstraint(
                fields=["client", "property"], name="uq_client_match_pair"
            ),
        ]
        indexes = [
            models.Index(
                fields=["client", "match_source", "match_group"],
                name="idx_cpm_client_grp",
            ),
            models.Index(fields=["client", "status"], name="idx_cpm_status"),
        ]


class ClientStatusLog(models.Model):
    """Audit log; record-level immutable (no deleted_at)."""

    id = models.UUIDField(primary_key=True)
    client = models.ForeignKey(
        "fonrey_client.Client", on_delete=models.RESTRICT, related_name="status_logs"
    )
    change_type = models.CharField(
        max_length=30, choices=ClientStatusLogChangeType.choices
    )
    old_value = models.JSONField(null=True, blank=True)
    new_value = models.JSONField(null=True, blank=True)
    reason = models.TextField(blank=True, default="")
    operator = models.ForeignKey(
        "org.Staff", on_delete=models.RESTRICT, related_name="client_status_changes"
    )
    operated_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = "client_status_logs"
        verbose_name = "客源状态变更日志"
        verbose_name_plural = "客源状态变更日志"
        indexes = [
            models.Index(fields=["client", "-operated_at"], name="idx_csl_client"),
            models.Index(fields=["change_type", "-operated_at"], name="idx_csl_type"),
        ]