"""Pydantic schemas for API request/response shapes."""

from datetime import date, datetime
from typing import Optional

from pydantic import BaseModel

from ten31portal.models import (
    UserRole, EntityType, EntityStatus, RoundStatus, DocumentCategory,
)


# --- Auth ---

class LoginRequest(BaseModel):
    login: str  # username or email
    password: str


class UserResponse(BaseModel):
    id: int
    name: str
    username: str
    email: str | None
    role: UserRole
    is_active: bool
    is_service_admin: bool = False
    primary_account_id: int | None = None  # set when this account logs in under another
    created_at: datetime


# --- User administration ---

class UserCreate(BaseModel):
    name: str
    username: str
    password: str
    role: UserRole
    email: str | None = None
    entity_ids: list[int] = []


class UserUpdate(BaseModel):
    name: str | None = None
    username: str | None = None
    email: str | None = None
    role: UserRole | None = None
    is_active: bool | None = None
    entity_ids: list[int] | None = None  # full replacement of grants when provided


class PasswordReset(BaseModel):
    password: str


class ChangePasswordRequest(BaseModel):
    current_password: str
    new_password: str


class LinkedAccount(BaseModel):
    id: int
    name: str
    username: str


class UserDetailResponse(BaseModel):
    id: int
    name: str
    username: str
    email: str | None
    role: UserRole
    is_active: bool
    is_service_admin: bool = False
    primary_account_id: int | None = None
    primary_account_name: str | None = None   # the login this account is linked under, if any
    linked_accounts: list[LinkedAccount] = []  # secondary names that log in under this account
    created_at: datetime
    entity_ids: list[int] = []


class AccountLink(BaseModel):
    # null detaches the account so it logs in on its own again
    primary_account_id: int | None = None


# --- Entity ---

class EntityCreate(BaseModel):
    name: str
    type: EntityType
    vintage_year: int | None = None
    fund_size_cents: int | None = None


class EntityUpdate(BaseModel):
    name: str | None = None
    type: EntityType | None = None
    vintage_year: int | None = None
    fund_size_cents: int | None = None
    status: EntityStatus | None = None


class EntityResponse(BaseModel):
    id: int
    name: str
    type: EntityType
    vintage_year: int | None
    fund_size_cents: int | None
    status: EntityStatus
    created_at: datetime


# --- Holding ---

class HoldingCreate(BaseModel):
    company_name: str


class HoldingUpdate(BaseModel):
    company_name: str | None = None


class HoldingResponse(BaseModel):
    id: int
    entity_id: int
    company_name: str
    created_at: datetime


# --- Position ---

class PositionCreate(BaseModel):
    security_name: str
    investment_date: date
    shares: str | None = None
    cost_dollars: float  # Accept dollars at API boundary, store as cents


class PositionUpdate(BaseModel):
    security_name: str | None = None
    investment_date: date | None = None
    shares: str | None = None
    cost_dollars: float | None = None


class PositionResponse(BaseModel):
    id: int
    holding_id: int
    security_name: str
    investment_date: date
    shares: str | None
    cost_cents: int
    created_at: datetime


# --- Valuation Round ---

class RoundCreate(BaseModel):
    quarter_end: date


class ValuationBulkItem(BaseModel):
    position_id: int
    value_cents: int


class ValuationBulkUpdate(BaseModel):
    valuations: list[ValuationBulkItem]


class ReturnNote(BaseModel):
    note: str


class ValuationResponse(BaseModel):
    id: int
    round_id: int
    position_id: int
    value_cents: int
    created_at: datetime


class RoundResponse(BaseModel):
    id: int
    entity_id: int
    quarter_end: date
    status: RoundStatus
    submitted_by: int | None
    submitted_at: datetime | None
    approved_by: int | None
    approved_at: datetime | None
    return_note: str | None
    is_seed: bool
    created_at: datetime
    valuations: list[ValuationResponse] = []


# --- Document ---

class DocumentResponse(BaseModel):
    id: int
    entity_id: int
    investor_user_id: int | None
    category: DocumentCategory
    title: str
    original_filename: str
    content_type: str
    size_bytes: int
    uploaded_by: int | None
    created_at: datetime


# --- Capital account ---

class CapitalAccountCreate(BaseModel):
    entity_id: int
    investor_user_id: int
    as_of_date: date
    commitment_dollars: float = 0
    beginning_balance_dollars: float = 0
    contributions_dollars: float = 0
    distributions_dollars: float = 0
    ending_balance_dollars: float = 0
    document_id: int | None = None


class CapitalAccountResponse(BaseModel):
    id: int
    entity_id: int
    investor_user_id: int
    investor_name: str | None = None  # legal name of the account this statement belongs to
    as_of_date: date
    commitment_cents: int
    beginning_balance_cents: int
    contributions_cents: int
    distributions_cents: int
    ending_balance_cents: int
    document_id: int | None
    created_at: datetime


# --- Partners (members of an entity) ---

class PartnerResponse(BaseModel):
    user_id: int
    name: str
    username: str
    external_investor_id: str | None
    is_active: bool
    login_enabled: bool
    latest_commitment_cents: int | None = None
    latest_contributions_cents: int | None = None
    latest_distributions_cents: int | None = None
    latest_value_cents: int | None
    latest_as_of: date | None
    statements_count: int


# --- Access matrix ---

class AccessGrant(BaseModel):
    user_id: int
    entity_id: int


class AccessMatrixResponse(BaseModel):
    users: list[UserResponse]
    entities: list[EntityResponse]
    grants: list[AccessGrant]


# --- Capital account import (review-and-confirm) ---

class ImportInvestorPreview(BaseModel):
    source_name: str          # name as it appears in the spreadsheet
    column_index: int         # 0-based column it was read from
    value_dollars: float      # current capital value (ending balance)
    commitment_dollars: float = 0
    contributions_dollars: float = 0
    distributions_dollars: float = 0
    external_id: str | None = None  # fund-admin INVESTOR ID, when present
    matched_user_id: int | None = None
    matched_username: str | None = None
    suggested_username: str | None = None  # for unmatched: a safe default


class ImportValueRow(BaseModel):
    row_index: int            # 0-based sheet row
    label: str                # col A label (e.g. "LTPF1")


class CapitalImportPreview(BaseModel):
    as_of_date: date | None
    value_rows: list[ImportValueRow]   # candidate rows holding per-investor balances
    chosen_row_index: int              # the row used for the values below
    investors: list[ImportInvestorPreview]


class ImportCommitInvestor(BaseModel):
    action: str               # "match" | "create" | "skip"
    value_dollars: float      # current capital value (ending balance)
    commitment_dollars: float = 0
    contributions_dollars: float = 0
    distributions_dollars: float = 0
    user_id: int | None = None        # for action=match
    name: str | None = None           # for action=create
    username: str | None = None       # for action=create
    email: str | None = None
    password: str | None = None       # for action=create; omit to create without a login
    external_id: str | None = None    # fund-admin INVESTOR ID, stored for re-import matching


class CapitalImportCommit(BaseModel):
    entity_id: int
    as_of_date: date
    investors: list[ImportCommitInvestor]


# --- Entity stakes (a GP/mgmt entity's interest in the funds it manages) ---

class EntityStakeCreate(BaseModel):
    fund_entity_id: int
    ownership_pct: float | None = None
    value_dollars: float | None = None
    note: str | None = None


class EntityStakeResponse(BaseModel):
    id: int
    holder_entity_id: int
    fund_entity_id: int
    fund_name: str | None = None
    fund_type: EntityType | None = None
    ownership_pct: float | None
    value_cents: int | None
    note: str | None
    created_at: datetime


# --- Investor View (admin reconstruction of what one investor sees) ---

class InvestorViewResponse(BaseModel):
    user: UserResponse
    entities: list[EntityResponse] = []
    capital_accounts: list[CapitalAccountResponse] = []
    documents: list[DocumentResponse] = []


# --- Audit ---

class AuditLogResponse(BaseModel):
    id: int
    actor_user_id: int | None
    action: str
    object_type: str
    object_id: int | None
    detail: dict | list | str | None
    created_at: datetime