from datetime import datetime
from enum import StrEnum
from typing import Any

from pydantic import BaseModel, ConfigDict, Field, field_validator


class UserProvider(StrEnum):
    LOCAL = "local"
    GOOGLE = "google"
    LOCAL_GOOGLE = "local_google"


class PlatformRole(StrEnum):
    USER = "user"
    PLATFORM_ADMIN = "platform_admin"


class OrganizationRole(StrEnum):
    OWNER = "owner"
    # Compatibility only: organization admin is not product-exposed in MVP.
    LEGACY_ADMIN = "admin"
    MEMBER = "member"
    VIEWER = "viewer"


class SourceScope(StrEnum):
    PUBLIC_VBPL = "public_vbpl"
    GUEST_SESSION = "guest_session"
    USER_PRIVATE = "user_private"
    ORG_PRIVATE = "org_private"


class AuthorityLevel(StrEnum):
    PUBLIC_LAW = "public_law"
    INTERNAL_POLICY = "internal_policy"
    UPLOADED_CONTEXT = "uploaded_context"


class SourceDocumentStatus(StrEnum):
    ACTIVE = "active"
    OUTDATED = "outdated"
    DRAFT = "draft"
    UNKNOWN = "unknown"
    PENDING_INDEX = "pending_index"
    INDEXING_FAILED = "indexing_failed"


class TokenType(StrEnum):
    ACCESS = "access"
    REFRESH = "refresh"
    OAUTH_STATE = "oauth_state"


class UserPublic(BaseModel):
    id: str
    email: str
    full_name: str | None = None
    avatar_url: str | None = None
    provider: UserProvider
    # Platform administration is independent from organization ownership.
    platform_role: PlatformRole
    is_active: bool
    is_verified: bool
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class MembershipPublic(BaseModel):
    id: str
    organization_id: str
    organization_name: str
    organization_slug: str
    role: OrganizationRole
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class CurrentUserResponse(BaseModel):
    user: UserPublic
    memberships: list[MembershipPublic] = Field(default_factory=list)


class RegisterRequest(BaseModel):
    email: str = Field(min_length=3, max_length=320)
    password: str = Field(min_length=8, max_length=200)
    full_name: str | None = Field(default=None, max_length=200)

    model_config = ConfigDict(extra="forbid")

    @field_validator("email")
    @classmethod
    def normalize_email(cls, value: str) -> str:
        email = value.strip().lower()
        if "@" not in email or email.startswith("@") or email.endswith("@"):
            raise ValueError("valid email is required")
        return email


class LoginRequest(BaseModel):
    email: str = Field(min_length=3, max_length=320)
    password: str = Field(min_length=1, max_length=200)

    @field_validator("email")
    @classmethod
    def normalize_email(cls, value: str) -> str:
        return value.strip().lower()


class RefreshTokenRequest(BaseModel):
    refresh_token: str = Field(min_length=16)


class LogoutRequest(BaseModel):
    refresh_token: str = Field(min_length=16)


class TokenResponse(BaseModel):
    access_token: str
    refresh_token: str
    token_type: str = "bearer"
    access_token_expires_in: int
    refresh_token_expires_in: int


class OrganizationCreateRequest(BaseModel):
    name: str = Field(min_length=1, max_length=200)
    slug: str | None = Field(default=None, min_length=1, max_length=120)


class OrganizationPublic(BaseModel):
    id: str
    name: str
    slug: str
    created_by_user_id: str
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class OrganizationCreateResponse(BaseModel):
    organization: OrganizationPublic
    membership: MembershipPublic
    invite_code: str


class OrganizationListResponse(BaseModel):
    organizations: list[OrganizationPublic]
    memberships: list[MembershipPublic]
    invite_code: str | None = None


class OrganizationJoinRequest(BaseModel):
    invite_code: str = Field(min_length=16, max_length=200)


class OrganizationJoinResponse(BaseModel):
    organization: OrganizationPublic
    membership: MembershipPublic


class InviteCodeResponse(BaseModel):
    organization_id: str
    invite_code: str


class OrganizationMemberPublic(BaseModel):
    id: str
    user_id: str
    email: str
    full_name: str | None = None
    role: OrganizationRole
    created_at: datetime
    updated_at: datetime


class OrganizationMembersResponse(BaseModel):
    organization_id: str
    members: list[OrganizationMemberPublic]


class SourceAccessContext(BaseModel):
    user_id: str | None = None
    guest_session_id: str | None = None
    organization_roles: dict[str, OrganizationRole] = Field(default_factory=dict)


class SourceAccessRequest(BaseModel):
    source_scope: SourceScope
    owner_user_id: str | None = None
    guest_session_id: str | None = None
    org_id: str | None = None
    uploaded_by: str | None = None
    authority_level: AuthorityLevel
    document_status: SourceDocumentStatus = SourceDocumentStatus.UNKNOWN
    source_uri: str | None = None
    metadata: dict[str, Any] = Field(default_factory=dict)


class SourceAccessDecision(BaseModel):
    allowed: bool
    reason: str