"""Pydantic v2 request schemas — quotation & procurement domain."""
from datetime import date, datetime
from decimal import Decimal
from typing import Literal
from uuid import UUID

from pydantic import Field

from app.schemas.common import APIModel

QuoteStatus = Literal["offered", "accepted", "arrived", "rejected", "expired"]
TermsheetStatus = Literal["offered", "accepted", "rejected"]
DiscountType = Literal["none", "percent", "fixed"]
DecisionStatus = Literal["pending", "chosen", "rejected"]


# ---------------------------------------------------------------------------
# Suppliers / projects
# ---------------------------------------------------------------------------

class SupplierCreate(APIModel):
    name: str = Field(min_length=1)
    category_id: UUID  # v2.6: 1 supplier → exactly 1 category (required)
    location: str | None = None
    phone: str | None = None
    contact_person: str | None = None
    tax_id: str | None = None


class SupplierUpdate(APIModel):
    name: str | None = Field(default=None, min_length=1)
    category_id: UUID | None = None
    location: str | None = None
    phone: str | None = None
    contact_person: str | None = None
    tax_id: str | None = None


class SupplierMaterialCreate(APIModel):
    """Link a global material to a supplier (derives materials.category_id)."""

    material_id: UUID


class ProjectCreate(APIModel):
    name: str = Field(min_length=1)
    description: str | None = None
    start_date: date | None = None


class ProjectUpdate(APIModel):
    name: str | None = Field(default=None, min_length=1)
    description: str | None = None
    start_date: date | None = None
    # PM assignment (1:N — one PM per project, a PM may own many projects).
    # Admin / procurement manager only; None unassigns this project's PM.
    pm_user_id: UUID | None = None


# ---------------------------------------------------------------------------
# Quotes
# ---------------------------------------------------------------------------

class QuoteLineItemIn(APIModel):
    temp_id: str = Field(min_length=1)
    material_id: UUID
    brand_material_id: UUID | None = None
    unit_id: int
    quantity: Decimal = Field(gt=0)
    notes: str | None = None
    project_ids: list[UUID] | None = None  # پروژه‌های تخصیص‌یافته به این قلم


class ScheduleStepIn(APIModel):
    step_no: int | None = Field(default=None, ge=1)
    due_date: date
    amount: Decimal
    note: str | None = None


class TermsheetIn(APIModel):
    temp_id: str = Field(min_length=1)
    label: str = Field(min_length=1)
    discount_type: DiscountType = "none"
    discount_value: Decimal = Decimal("0")
    schedule_steps: list[ScheduleStepIn] = Field(default_factory=list)


class ItemTermsheetLinkIn(APIModel):
    line_item_temp_id: str = Field(min_length=1)
    termsheet_temp_id: str = Field(min_length=1)
    unit_price: Decimal = Field(gt=0)
    min_order_qty: Decimal | None = Field(default=None, gt=0)


class QuoteCreate(APIModel):
    supplier_id: UUID
    project_id: UUID | None = None
    project_ids: list[UUID] = Field(default_factory=list)  # چند پروژه برای یک پیشنهاد
    quote_date: datetime | None = None
    expiry_date: date | None = None
    is_official: bool = True
    notes: str | None = None
    # اقلام/شرایط پرداخت/قیمت‌ها می‌توانند خالی باشند — کاربر ممکن است بخواهد
    # پیشنهادی ناقص را ذخیره کند (task: عدم اجبار تکمیل فیلدها)
    line_items: list[QuoteLineItemIn] = Field(default_factory=list)
    termsheets: list[TermsheetIn] = Field(default_factory=list)
    item_termsheets: list[ItemTermsheetLinkIn] = Field(default_factory=list)


class QuoteChildrenReplaceIn(APIModel):
    """Full replacement of a quote's line items + termsheets (edit modal)."""

    line_items: list[QuoteLineItemIn] = Field(default_factory=list)
    termsheets: list[TermsheetIn] = Field(default_factory=list)
    item_termsheets: list[ItemTermsheetLinkIn] = Field(default_factory=list)


class QuoteUpdate(APIModel):
    supplier_id: UUID | None = None
    project_id: UUID | None = None
    project_ids: list[UUID] | None = None
    quote_date: datetime | None = None
    expiry_date: date | None = None
    is_official: bool | None = None
    notes: str | None = None
    status: QuoteStatus | None = None


class AcceptTermsheetIn(APIModel):
    id: UUID | None = None
    label: str | None = Field(default=None, min_length=1)
    discount_type: DiscountType = "none"
    discount_value: Decimal = Decimal("0")
    schedule_steps: list[ScheduleStepIn] = Field(min_length=1)


class ItemDecisionIn(APIModel):
    line_item_id: UUID
    status: Literal["chosen", "rejected"]
    accepted_termsheet_index: int | None = Field(default=None, ge=0)
    adjusted_unit_price: Decimal | None = Field(default=None, gt=0)
    adjusted_notes: str | None = None
    project_id: UUID | None = Field(default=None, description="The ONE purchased project (v2.6 — required when the offer spans several projects)")


class ItemProjectsIn(APIModel):
    line_item_id: UUID
    project_ids: list[UUID] = Field(default_factory=list)


class AcceptQuoteIn(APIModel):
    accepted_termsheets: list[AcceptTermsheetIn] = Field(min_length=1)
    item_decisions: list[ItemDecisionIn] = Field(min_length=1)
    item_projects: list[ItemProjectsIn] = Field(default_factory=list)  # تخصیص پروژه به هر قلم


class ArriveItemIn(APIModel):
    line_item_id: UUID
    received_qty: Decimal = Field(gt=0)
    received_at: datetime | None = None
    on_time: bool | None = None
    quality_note: str | None = None


class ArriveItemsIn(APIModel):
    items: list[ArriveItemIn] = Field(default_factory=list)


# ---------------------------------------------------------------------------
# v2.6 — PM arrival confirmation (item_decisions.project_id + allocations)
# ---------------------------------------------------------------------------

class ReceiptAllocationIn(APIModel):
    warehouse_id: UUID
    quantity: Decimal = Field(gt=0)


class PMReceiptCreate(APIModel):
    """PM confirms a delivery: receipt + warehouse split (free count).

    Allocations must sum exactly to received_qty and every warehouse must
    belong to item_decisions.project_id.
    """

    item_decision_id: UUID
    received_qty: Decimal = Field(gt=0)
    allocations: list[ReceiptAllocationIn] = Field(min_length=1)
    received_at: datetime | None = None
    on_time: bool | None = None
    quality_note: str | None = None


class UserCreate(APIModel):
    """Define a new user from the Organization panel (admin / procurement manager).

    casdoor_id is optional: real Casdoor users auto-provision on their first
    login; a manual entry gets a synthetic casdoor_id so the row can exist
    before the person ever signs in.
    """

    first_name: str = Field(min_length=1)
    last_name: str = ""
    phone: str | None = None
    casdoor_id: str | None = None
    role: Literal["pm", "procurement_manager", "admin"] | None = None


class UserRoleUpdate(APIModel):
    """role=None revokes the role (and any project assignment)."""

    role: Literal["pm", "procurement_manager", "admin"] | None = None


class UserProjectUpdate(APIModel):
    """Assign the user to one project (multi-project aware).

    project_id given → that project gets this PM (previous PM replaced,
    the user's other projects kept); None → clears every assignment.
    """

    project_id: UUID | None = None


class RejectQuoteIn(APIModel):
    reason: str | None = None


class NoteEventIn(APIModel):
    event_type: Literal["note"] = "note"
    payload: dict = Field(default_factory=dict)
    actor: str | None = None


# ---------------------------------------------------------------------------
# Line items / specs
# ---------------------------------------------------------------------------

class LineItemCreate(APIModel):
    material_id: UUID
    brand_material_id: UUID | None = None
    unit_id: int
    quantity: Decimal = Field(gt=0)
    notes: str | None = None


class LineItemUpdate(APIModel):
    material_id: UUID | None = None
    brand_material_id: UUID | None = None
    unit_id: int | None = None
    quantity: Decimal | None = Field(default=None, gt=0)
    notes: str | None = None


class SpecIn(APIModel):
    attribute_definition_id: UUID
    value: int | float | str | bool | None = None
    unit_id_at_time: int | None = None


class SpecsPutIn(APIModel):
    specs: list[SpecIn] = Field(default_factory=list)


# ---------------------------------------------------------------------------
# Termsheets / schedule steps
# ---------------------------------------------------------------------------

class TermsheetCreate(APIModel):
    label: str = Field(min_length=1)
    discount_type: DiscountType = "none"
    discount_value: Decimal = Decimal("0")
    schedule_steps: list[ScheduleStepIn] = Field(min_length=1)


class TermsheetUpdate(APIModel):
    label: str | None = Field(default=None, min_length=1)
    discount_type: DiscountType | None = None
    discount_value: Decimal | None = None


class TermsheetStatusUpdate(APIModel):
    status: Literal["accepted", "rejected"]


class ScheduleStepCreate(APIModel):
    step_no: int | None = Field(default=None, ge=1)
    due_date: date
    amount: Decimal
    note: str | None = None


class ScheduleStepUpdate(APIModel):
    step_no: int | None = Field(default=None, ge=1)
    due_date: date | None = None
    amount: Decimal | None = None
    note: str | None = None


# ---------------------------------------------------------------------------
# Item termsheets / decisions / receipts
# ---------------------------------------------------------------------------

class ItemTermsheetCreate(APIModel):
    termsheet_id: UUID
    unit_price: Decimal = Field(gt=0)
    min_order_qty: Decimal | None = Field(default=None, gt=0)


class ItemTermsheetUpdate(APIModel):
    unit_price: Decimal | None = Field(default=None, gt=0)
    min_order_qty: Decimal | None = Field(default=None, gt=0)


class DecisionPut(APIModel):
    chosen_item_termsheet_id: UUID | None = None
    status: Literal["chosen", "rejected"]
    adjusted_unit_price: Decimal | None = Field(default=None, gt=0)
    adjusted_notes: str | None = None


class DecisionStatusUpdate(APIModel):
    status: Literal["chosen", "rejected"]


class DecisionPatch(APIModel):
    chosen_item_termsheet_id: UUID | None = None
    adjusted_unit_price: Decimal | None = Field(default=None, gt=0)
    adjusted_notes: str | None = None


class ReceiptCreate(APIModel):
    received_at: datetime | None = None
    received_qty: Decimal = Field(gt=0)
    on_time: bool | None = None
    quality_note: str | None = None


class ReceiptUpdate(APIModel):
    received_at: datetime | None = None
    received_qty: Decimal | None = Field(default=None, gt=0)
    on_time: bool | None = None
    quality_note: str | None = None