from django.db import models

from common.models import SoftDeleteModel, TimeStampedModel


class NavPosition(models.IntegerChoices):
    TOP = 1, "顶部"
    MIDDLE = 2, "中部"
    BOTTOM = 3, "底部"


class Column(SoftDeleteModel):
    """导航栏目。"""

    uuid = models.CharField(max_length=64, blank=True, default="", verbose_name="栏目 UUID")
    name = models.CharField(max_length=200, verbose_name="名称")
    description = models.TextField(blank=True, default="", verbose_name="描述")
    note = models.TextField(blank=True, default="", verbose_name="备注")
    template_id = models.IntegerField(null=True, blank=True, verbose_name="页面模板")
    position = models.IntegerField(
        choices=NavPosition.choices, default=NavPosition.TOP, verbose_name="位置"
    )
    parent = models.ForeignKey(
        "self",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="children",
        verbose_name="父栏目",
    )
    sort = models.IntegerField(default=0, verbose_name="排序")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")
    path = models.CharField(max_length=200, blank=True, default="", verbose_name="前端路径")

    class Meta:
        ordering = ["sort", "id"]
        verbose_name = "栏目"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name


class TaxonomyBase(SoftDeleteModel):
    """分类字典公共字段。"""

    serial_num = models.CharField(max_length=64, blank=True, default="", verbose_name="编号")
    name = models.CharField(max_length=200, verbose_name="名称")
    sort = models.IntegerField(default=0, verbose_name="排序")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        abstract = True

    def __str__(self):
        return self.name


class Subject(TaxonomyBase):
    """学科。"""

    parent = models.ForeignKey(
        "self",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="children",
        verbose_name="父学科",
    )

    class Meta:
        ordering = ["sort", "id"]
        verbose_name = "学科"
        verbose_name_plural = verbose_name


class OrganizeCategory(TaxonomyBase):
    """机构类别。"""

    parent = models.ForeignKey(
        "self",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="children",
        verbose_name="父类别",
    )

    class Meta:
        ordering = ["sort", "id"]
        verbose_name = "机构类别"
        verbose_name_plural = verbose_name


class MagazineCategory(TaxonomyBase):
    """杂志类别。"""

    parent = models.ForeignKey(
        "self",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="children",
        verbose_name="父类别",
    )

    class Meta:
        ordering = ["sort", "id"]
        verbose_name = "杂志类别"
        verbose_name_plural = verbose_name


class ArticleType(TaxonomyBase):
    """文献类型（指南、共识等，可后台维护）。"""

    code = models.CharField(
        max_length=8,
        unique=True,
        verbose_name="字母标识",
        help_text="用于文献编号前缀，如 G、C",
    )
    note = models.TextField(blank=True, default="", verbose_name="备注")

    class Meta:
        ordering = ["sort", "id"]
        verbose_name = "文献类型"
        verbose_name_plural = verbose_name


class Organize(SoftDeleteModel):
    """制订机构。"""

    serial_num = models.CharField(max_length=64, blank=True, default="", verbose_name="编号")
    name = models.CharField(max_length=200, verbose_name="名称")
    logo = models.URLField(blank=True, default="", verbose_name="Logo")
    description = models.TextField(blank=True, default="", verbose_name="描述")
    url = models.URLField(blank=True, default="", verbose_name="官网")
    category = models.ForeignKey(
        OrganizeCategory,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="organizes",
        verbose_name="机构类别",
    )
    flags = models.JSONField(default=list, blank=True, verbose_name="标签")
    collect_num = models.PositiveIntegerField(default=0, verbose_name="收藏数")
    like_num = models.PositiveIntegerField(default=0, verbose_name="点赞数")
    share_num = models.PositiveIntegerField(default=0, verbose_name="分享数")
    rank = models.IntegerField(null=True, blank=True, verbose_name="首页排序")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        ordering = ["rank", "id"]
        verbose_name = "机构"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name


class Magazine(SoftDeleteModel):
    """杂志。"""

    serial_num = models.CharField(max_length=64, blank=True, default="", verbose_name="编号")
    name = models.CharField(max_length=200, verbose_name="名称")
    logo = models.URLField(blank=True, default="", verbose_name="Logo")
    category = models.ForeignKey(
        MagazineCategory,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="magazines",
        verbose_name="杂志类别",
    )
    subjects = models.ManyToManyField(
        Subject,
        blank=True,
        related_name="magazines",
        verbose_name="学科",
    )
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        ordering = ["id"]
        verbose_name = "杂志"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name


class Specialty(SoftDeleteModel):
    """专科/专长。"""

    name = models.CharField(max_length=200, verbose_name="名称")
    type = models.IntegerField(null=True, blank=True, verbose_name="类型")
    description = models.TextField(blank=True, default="", verbose_name="描述")
    logo = models.URLField(blank=True, default="", verbose_name="Logo")
    content = models.JSONField(default=list, blank=True, verbose_name="内容块")
    position = models.IntegerField(default=0, verbose_name="排序")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        ordering = ["position", "id"]
        verbose_name = "专科"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name


class WorkGroup(SoftDeleteModel):
    """工作组模板（可含分委会层级）。"""

    name = models.CharField(max_length=200, verbose_name="名称")
    description = models.TextField(blank=True, default="", verbose_name="描述")
    parent = models.ForeignKey(
        "self",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="children",
        verbose_name="上级工作组",
    )
    sort = models.IntegerField(default=0, verbose_name="排序")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        ordering = ["sort", "id"]
        verbose_name = "工作组"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name


class WorkGroupTerm(SoftDeleteModel):
    """工作组某一届；parent 表示同届内的分委会层级。"""

    workgroup = models.ForeignKey(
        WorkGroup,
        on_delete=models.CASCADE,
        related_name="terms",
        verbose_name="工作组",
    )
    parent = models.ForeignKey(
        "self",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="children",
        verbose_name="同届上级",
    )
    name = models.CharField(max_length=200, verbose_name="届次名称")
    start_year = models.IntegerField(null=True, blank=True, verbose_name="起始年")
    end_year = models.IntegerField(null=True, blank=True, verbose_name="结束年")
    is_current = models.BooleanField(default=False, verbose_name="现任届")
    sort = models.IntegerField(default=0, verbose_name="排序")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        ordering = ["-is_current", "-start_year", "sort", "id"]
        verbose_name = "工作组届次"
        verbose_name_plural = verbose_name

    def __str__(self):
        return f"{self.workgroup.name} · {self.name}"


class WorkGroupMembership(models.Model):
    """专家在某一届/分委会中的任职。"""

    professor = models.ForeignKey(
        "Professor",
        on_delete=models.CASCADE,
        related_name="memberships",
        verbose_name="专家",
    )
    term = models.ForeignKey(
        WorkGroupTerm,
        on_delete=models.CASCADE,
        related_name="memberships",
        verbose_name="届次",
    )
    role = models.CharField(max_length=200, blank=True, default="", verbose_name="组内职务")

    class Meta:
        unique_together = [("professor", "term")]
        verbose_name = "工作组任职"
        verbose_name_plural = verbose_name

    def __str__(self):
        return f"{self.professor_id}@{self.term_id}"


class Professor(SoftDeleteModel):
    """专家。"""

    serial_num = models.CharField(max_length=64, blank=True, default="", verbose_name="编号")
    name = models.CharField(max_length=200, verbose_name="名称")
    type = models.IntegerField(null=True, blank=True, verbose_name="分类")
    role = models.CharField(max_length=200, blank=True, default="", verbose_name="身份")
    job = models.CharField(max_length=200, blank=True, default="", verbose_name="职称")
    description = models.TextField(blank=True, default="", verbose_name="简介")
    email = models.EmailField(blank=True, default="", verbose_name="邮箱")
    addr = models.CharField(max_length=500, blank=True, default="", verbose_name="地址")
    logo = models.URLField(blank=True, default="", verbose_name="头像")
    phone = models.CharField(max_length=50, blank=True, default="", verbose_name="电话")
    position = models.IntegerField(default=0, verbose_name="排序")
    terms = models.ManyToManyField(
        WorkGroupTerm,
        through="WorkGroupMembership",
        blank=True,
        related_name="professors",
        verbose_name="所属届次",
    )
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        ordering = ["position", "id"]
        verbose_name = "专家"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name


class StarRule(SoftDeleteModel):
    """STAR 评分规则。"""

    name = models.CharField(max_length=200, verbose_name="名称")
    year = models.IntegerField(verbose_name="年份")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        ordering = ["-year", "id"]
        verbose_name = "STAR 规则"
        verbose_name_plural = verbose_name

    def __str__(self):
        return f"{self.name} ({self.year})"


class RuleBand(SoftDeleteModel):
    """评分分档明细。"""

    rule = models.ForeignKey(
        StarRule, on_delete=models.CASCADE, related_name="bands", verbose_name="规则"
    )
    star_low = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="最低分")
    star_high = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="最高分")
    star = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="星级")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    class Meta:
        ordering = ["star_low", "id"]
        verbose_name = "评分分档"
        verbose_name_plural = verbose_name

    def __str__(self):
        return f"{self.rule_id}: {self.star_low}-{self.star_high}"


class Article(SoftDeleteModel):
    """指南 / 共识文献。"""

    serial_number = models.CharField(max_length=64, blank=True, default="", verbose_name="编号")
    title = models.CharField(max_length=500, verbose_name="标题")
    type = models.ForeignKey(
        ArticleType,
        on_delete=models.PROTECT,
        related_name="articles",
        verbose_name="类型",
    )
    year = models.IntegerField(null=True, blank=True, verbose_name="年份")
    score = models.DecimalField(
        max_digits=10, decimal_places=2, null=True, blank=True, verbose_name="STAR 得分"
    )
    url = models.URLField(blank=True, default="", verbose_name="原文地址")
    flags = models.JSONField(default=list, blank=True, verbose_name="标签")
    content = models.TextField(blank=True, default="", verbose_name="正文")
    introduction = models.TextField(blank=True, default="", verbose_name="简介")
    push_date = models.CharField(max_length=32, blank=True, default="", verbose_name="发布日期")
    read_num = models.PositiveIntegerField(default=0, verbose_name="阅读数")
    collect_num = models.PositiveIntegerField(default=0, verbose_name="收藏数")
    like_num = models.PositiveIntegerField(default=0, verbose_name="点赞数")
    share_num = models.PositiveIntegerField(default=0, verbose_name="分享数")
    rank = models.IntegerField(null=True, blank=True, verbose_name="首页排序")
    is_disabled = models.BooleanField(default=False, verbose_name="禁用")

    organizes = models.ManyToManyField(
        Organize, blank=True, related_name="articles", verbose_name="机构"
    )
    magazines = models.ManyToManyField(
        Magazine, blank=True, related_name="articles", verbose_name="杂志"
    )
    subjects = models.ManyToManyField(
        Subject,
        blank=True,
        related_name="articles",
        verbose_name="学科",
    )

    class Meta:
        ordering = ["-year", "-score", "id"]
        verbose_name = "文献"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.title


class ReviewStatus(models.IntegerChoices):
    PENDING = 1, "待审核"
    REJECTED = 2, "不通过"
    APPROVED = 3, "通过"


class ArticleComment(SoftDeleteModel):
    """指南/共识用户评价。"""

    article = models.ForeignKey(
        Article,
        on_delete=models.CASCADE,
        related_name="comments",
        verbose_name="文献",
    )
    member = models.ForeignKey(
        "accounts.Member",
        on_delete=models.CASCADE,
        related_name="comments",
        verbose_name="会员",
    )
    star = models.DecimalField(max_digits=3, decimal_places=1, verbose_name="评价星级")
    content = models.TextField(blank=True, default="", verbose_name="评价内容")
    review_status = models.IntegerField(
        choices=ReviewStatus.choices,
        default=ReviewStatus.PENDING,
        verbose_name="审核状态",
    )

    class Meta:
        ordering = ["-id"]
        verbose_name = "文献评价"
        verbose_name_plural = verbose_name

    def __str__(self):
        return f"Comment#{self.pk} on Article#{self.article_id}"


class ArticleLike(TimeStampedModel):
    """会员点赞文献（需登录；取消则硬删除）。"""

    article = models.ForeignKey(
        Article,
        on_delete=models.CASCADE,
        related_name="likes",
        verbose_name="文献",
    )
    member = models.ForeignKey(
        "accounts.Member",
        on_delete=models.CASCADE,
        related_name="article_likes",
        verbose_name="会员",
    )

    class Meta:
        ordering = ["-id"]
        verbose_name = "文献点赞"
        verbose_name_plural = verbose_name
        constraints = [
            models.UniqueConstraint(
                fields=["article", "member"],
                name="content_articlelike_article_member_uniq",
            )
        ]

    def __str__(self):
        return f"Like member={self.member_id} article={self.article_id}"


class ArticleCollect(TimeStampedModel):
    """会员收藏文献（需登录；取消则硬删除）。"""

    article = models.ForeignKey(
        Article,
        on_delete=models.CASCADE,
        related_name="collections",
        verbose_name="文献",
    )
    member = models.ForeignKey(
        "accounts.Member",
        on_delete=models.CASCADE,
        related_name="article_collections",
        verbose_name="会员",
    )

    class Meta:
        ordering = ["-id"]
        verbose_name = "文献收藏"
        verbose_name_plural = verbose_name
        constraints = [
            models.UniqueConstraint(
                fields=["article", "member"],
                name="content_articlecollect_article_member_uniq",
            )
        ]

    def __str__(self):
        return f"Collect member={self.member_id} article={self.article_id}"


class ArticleShare(TimeStampedModel):
    """
    文献分享去重记录：同一会员或同一访客对同一文献只计一次。
    - 已登录：按 member 去重
    - 未登录：按前端 visitor_key（如 localStorage UUID）去重
    """

    article = models.ForeignKey(
        Article,
        on_delete=models.CASCADE,
        related_name="shares",
        verbose_name="文献",
    )
    member = models.ForeignKey(
        "accounts.Member",
        on_delete=models.CASCADE,
        null=True,
        blank=True,
        related_name="article_shares",
        verbose_name="会员",
    )
    visitor_key = models.CharField(
        max_length=64,
        blank=True,
        default="",
        verbose_name="访客标识",
    )

    class Meta:
        ordering = ["-id"]
        verbose_name = "文献分享"
        verbose_name_plural = verbose_name
        constraints = [
            models.UniqueConstraint(
                fields=["article", "member"],
                condition=models.Q(member__isnull=False),
                name="content_articleshare_article_member_uniq",
            ),
            models.UniqueConstraint(
                fields=["article", "visitor_key"],
                condition=~models.Q(visitor_key=""),
                name="content_articleshare_article_visitor_uniq",
            ),
        ]

    def __str__(self):
        who = f"member={self.member_id}" if self.member_id else f"visitor={self.visitor_key}"
        return f"Share {who} article={self.article_id}"