"""全渠道与电商对接模型：
1. ChannelAccount 电商平台授权店铺配置（抖店、拼多多、1688 等）
2. ChannelOrder 外部拉取订单及本地销售订单映射
3. WebhookEvent 外部回调与事件分发日志
"""

from django.db import models
from apps.core.base_models import TenantScopedModel


class ChannelAccount(TenantScopedModel):
    """渠道授权店铺配置。"""

    PLATFORM_CHOICES = [
        ("douyin", "抖音电商 / 抖店"),
        ("pinduoduo", "拼多多"),
        ("1688", "1688 阿里分销"),
        ("kuaishou", "快手小店"),
        ("custom", "自定义开放接口"),
    ]

    platform = models.CharField(max_length=32, choices=PLATFORM_CHOICES, default="douyin")
    shop_id = models.CharField(max_length=64, help_text="外部平台店铺ID")
    shop_name = models.CharField(max_length=128, help_text="店铺名称")
    app_key = models.CharField(max_length=128, blank=True, default="")
    app_secret = models.CharField(max_length=255, blank=True, default="")
    access_token = models.TextField(blank=True, default="")
    refresh_token = models.TextField(blank=True, default="")
    token_expires_at = models.DateTimeField(null=True, blank=True)
    is_active = models.BooleanField(default=True)

    # 业务映射默认值
    default_warehouse = models.ForeignKey(
        "inventory.Warehouse",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="+",
        help_text="该店铺订单默认出库仓库",
    )
    default_customer = models.ForeignKey(
        "partner.Customer",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="+",
        help_text="该店铺归属的客户（挂账往来）",
    )

    class Meta:
        db_table = "channel_account"
        unique_together = [("tenant", "platform", "shop_id")]
        verbose_name_plural = "电商店铺配置"
        ordering = ["platform", "shop_name"]

    def __str__(self):
        return f"[{self.get_platform_display()}] {self.shop_name} ({self.shop_id})"


class ChannelOrder(TenantScopedModel):
    """外部渠道拉取的订单。"""

    SYNC_STATUS_CHOICES = [
        ("pending", "待转单"),
        ("converted", "已转销售单"),
        ("failed", "转单失败"),
        ("ignored", "已忽略"),
    ]

    channel_account = models.ForeignKey(
        ChannelAccount,
        on_delete=models.CASCADE,
        related_name="orders",
    )
    external_order_id = models.CharField(max_length=128, help_text="外部平台订单号")
    order_status = models.CharField(max_length=64, default="", help_text="外部平台订单状态（如 PAID, SHIPPED）")
    order_amount = models.DecimalField(max_digits=18, decimal_places=4, default=0)
    buyer_name = models.CharField(max_length=64, blank=True, default="")
    buyer_phone = models.CharField(max_length=32, blank=True, default="")
    receiver_address = models.CharField(max_length=255, blank=True, default="")

    sync_status = models.CharField(max_length=16, choices=SYNC_STATUS_CHOICES, default="pending")
    sync_error = models.TextField(blank=True, default="")

    # 关联生成的本地销售单
    sales_order = models.ForeignKey(
        "sales.SalesOrder",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="channel_orders",
        help_text="关联的内部销售订单",
    )

    raw_payload = models.JSONField(default=dict, blank=True, help_text="外部原始订单 JSON")

    class Meta:
        db_table = "channel_order"
        unique_together = [("tenant", "channel_account", "external_order_id")]
        verbose_name_plural = "渠道订单"
        indexes = [
            models.Index(fields=["tenant", "sync_status"]),
            models.Index(fields=["tenant", "external_order_id"]),
        ]
        ordering = ["-created_at"]

    def __str__(self):
        return f"{self.channel_account.shop_name} 订单: {self.external_order_id} [{self.sync_status}]"


class WebhookEvent(TenantScopedModel):
    """Webhook 回调与事件分发日志。"""

    DIRECTION_CHOICES = [
        ("inbound", "外部推送回调"),
        ("outbound", "本系统向外推送"),
    ]
    STATUS_CHOICES = [
        ("received", "已接收"),
        ("processed", "处理成功"),
        ("failed", "处理失败"),
    ]

    direction = models.CharField(max_length=16, choices=DIRECTION_CHOICES, default="inbound")
    event_type = models.CharField(max_length=64, help_text="事件类型，如 order.paid, stock.changed")
    source = models.CharField(max_length=32, default="douyin", help_text="来源系统或平台")
    payload = models.JSONField(default=dict, blank=True)
    status = models.CharField(max_length=16, choices=STATUS_CHOICES, default="received")
    error_message = models.TextField(blank=True, default="")

    class Meta:
        db_table = "channel_webhook_event"
        verbose_name_plural = "Webhook事件日志"
        ordering = ["-created_at"]