from django.db import models
from django.contrib.auth import get_user_model

User = get_user_model()


class City(models.Model):
    name = models.CharField(max_length=50, verbose_name="城市名称")
    code = models.CharField(max_length=20, unique=True, verbose_name="城市代码")
    description = models.TextField(verbose_name="城市描述", blank=True)
    image = models.ImageField(upload_to='cities/', verbose_name="城市图片", null=True, blank=True)
    is_hot = models.BooleanField(default=False, verbose_name="是否热门")
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    updated_at = models.DateTimeField(auto_now=True, verbose_name="更新时间")

    class Meta:
        verbose_name = "城市"
        verbose_name_plural = "城市"

    def __str__(self):
        return self.name

class Attraction(models.Model):
    city = models.ForeignKey(City, on_delete=models.CASCADE, related_name='attractions')
    name = models.CharField(max_length=100, verbose_name="景点名称")
    description = models.TextField(verbose_name="景点描述")
    short_desc = models.CharField(max_length=200, verbose_name="简短描述")
    address = models.CharField(max_length=200, verbose_name="地址")
    latitude = models.FloatField(verbose_name="纬度", null=True, blank=True)
    longitude = models.FloatField(verbose_name="经度", null=True, blank=True)
    ticket_price = models.DecimalField(max_digits=8, decimal_places=2, verbose_name="门票价格", default=0)
    open_hours = models.CharField(max_length=100, verbose_name="开放时间", blank=True)
    image = models.ImageField(upload_to='attractions/', verbose_name="景点图片", null=True, blank=True)
    tags = models.JSONField(default=list, verbose_name="标签")
    history = models.TextField(verbose_name="历史背景", blank=True)
    is_featured = models.BooleanField(default=False, verbose_name="是否特色")
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        verbose_name = "景点"
        verbose_name_plural = "景点"

    def __str__(self):
        return f"{self.name} ({self.city.name})"
class UserPreference(models.Model):
    TRANSPORT_CHOICES = [
        ('walking', '步行'),
        ('driving', '自驾'),
        ('public', '公共交通'),
        ('mixed', '混合'),
    ]

    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='preferences', verbose_name="用户")
    cities = models.ManyToManyField(City, verbose_name="选择城市")
    days = models.PositiveSmallIntegerField(verbose_name="旅行天数")
    interests = models.JSONField(default=list, verbose_name="兴趣偏好")
    transport = models.CharField(max_length=20, choices=TRANSPORT_CHOICES, verbose_name="出行方式")
    custom_requirements = models.TextField(verbose_name="特殊需求", blank=True)
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    updated_at = models.DateTimeField(auto_now=True, verbose_name="更新时间")

    class Meta:
        verbose_name = "用户偏好"
        verbose_name_plural = "用户偏好"

    def __str__(self):
        return f"{self.user.username}的偏好设置"


class TravelPlan(models.Model):
    STATUS_CHOICES = [
        ('generating', '生成中'),
        ('completed', '已完成'),
        ('failed', '失败'),
    ]

    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='travel_plans', verbose_name="用户")
    preference = models.ForeignKey(UserPreference, on_delete=models.CASCADE, related_name='plans',
                                   verbose_name="偏好设置")
    title = models.CharField(max_length=100, verbose_name="行程标题")
    description = models.TextField(verbose_name="行程描述")
    days = models.PositiveSmallIntegerField(verbose_name="天数")
    suitable_for = models.CharField(max_length=100, verbose_name="适合人群", blank=True)
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='generating', verbose_name="状态")
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    updated_at = models.DateTimeField(auto_now=True, verbose_name="更新时间")

    class Meta:
        verbose_name = "旅行计划"
        verbose_name_plural = "旅行计划"

    def __str__(self):
        return f"{self.user.username}的{self.title}"


class DayPlan(models.Model):
    travel_plan = models.ForeignKey(TravelPlan, on_delete=models.CASCADE, related_name='day_plans',
                                    verbose_name="旅行计划")
    day = models.PositiveSmallIntegerField(verbose_name="第几天")
    theme = models.CharField(max_length=100, verbose_name="当日主题")
    description = models.TextField(verbose_name="当日描述", blank=True)
    transport = models.CharField(max_length=200, verbose_name="交通方式", blank=True)
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    updated_at = models.DateTimeField(auto_now=True, verbose_name="更新时间")

    class Meta:
        verbose_name = "每日计划"
        verbose_name_plural = "每日计划"
        ordering = ['travel_plan', 'day']

    def __str__(self):
        return f"{self.travel_plan.title} - 第{self.day}天"


class DayPlanAttraction(models.Model):
    day_plan = models.ForeignKey(DayPlan, on_delete=models.CASCADE, related_name='attractions', verbose_name="每日计划")
    attraction = models.ForeignKey(Attraction, on_delete=models.CASCADE, verbose_name="景点")
    order = models.PositiveSmallIntegerField(verbose_name="顺序")
    visit_time = models.CharField(max_length=50, verbose_name="参观时间", blank=True)
    notes = models.TextField(verbose_name="备注", blank=True)
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")

    class Meta:
        verbose_name = "每日计划景点"
        verbose_name_plural = "每日计划景点"
        ordering = ['day_plan', 'order']

    def __str__(self):
        return f"{self.day_plan} - {self.attraction.name}"