package contract

import (
	"time"

	"github.com/google/uuid"
)

type CreatePurchaseOrderRequest struct {
	VendorID        *uuid.UUID `json:"vendor_id,omitempty" validate:"omitempty"`
	PONumber        string     `json:"po_number" validate:"required,min=1,max=50"`
	TransactionDate string     `json:"transaction_date" validate:"required"`    // Format: YYYY-MM-DD
	DueDate         *string    `json:"due_date,omitempty" validate:"omitempty"` // Format: YYYY-MM-DD
	Reference       *string    `json:"reference,omitempty" validate:"omitempty,max=100"`
	Status          *string    `json:"status,omitempty" validate:"omitempty,oneof=draft sent approved received cancelled"`
	Message         *string    `json:"message,omitempty" validate:"omitempty"`
	TeamScope       *string    `json:"team_scope,omitempty" validate:"omitempty,oneof=category central"`
	TeamCategoryID  *uuid.UUID `json:"team_category_id,omitempty" validate:"omitempty"`
	// CashAdvanceID marks the purchase as paid out of cash advanced to the team. Sending
	// it without a team charges the purchase to the cash advance's team.
	CashAdvanceID     *uuid.UUID                       `json:"cash_advance_id,omitempty" validate:"omitempty"`
	Items             []CreatePurchaseOrderItemRequest `json:"items" validate:"required,min=1,dive"`
	AttachmentFileIDs []uuid.UUID                      `json:"attachment_file_ids,omitempty"`
}

type CreatePurchaseOrderItemRequest struct {
	IngredientID       *uuid.UUID `json:"ingredient_id,omitempty" validate:"omitempty"`
	PurchaseCategoryID uuid.UUID  `json:"purchase_category_id" validate:"required"`
	Description        *string    `json:"description,omitempty" validate:"omitempty"`
	Quantity           *float64   `json:"quantity,omitempty" validate:"omitempty,gt=0"`
	UnitID             *uuid.UUID `json:"unit_id,omitempty" validate:"omitempty"`
	Amount             float64    `json:"amount" validate:"required,gte=0"`
}

type UpdatePurchaseOrderRequest struct {
	VendorID        *uuid.UUID `json:"vendor_id,omitempty" validate:"omitempty"`
	PONumber        *string    `json:"po_number,omitempty" validate:"omitempty,min=1,max=50"`
	TransactionDate *string    `json:"transaction_date,omitempty" validate:"omitempty"` // Format: YYYY-MM-DD
	DueDate         *string    `json:"due_date,omitempty" validate:"omitempty"`         // Format: YYYY-MM-DD
	Reference       *string    `json:"reference,omitempty" validate:"omitempty,max=100"`
	Status          *string    `json:"status,omitempty" validate:"omitempty,oneof=draft sent approved received cancelled"`
	Message         *string    `json:"message,omitempty" validate:"omitempty"`
	// An empty string clears the team; omitting the field leaves it untouched.
	TeamScope      *string    `json:"team_scope,omitempty" validate:"omitempty"`
	TeamCategoryID *uuid.UUID `json:"team_category_id,omitempty" validate:"omitempty"`
	// An all-zero uuid unlinks the cash advance; omitting the field leaves it untouched.
	CashAdvanceID     *uuid.UUID                       `json:"cash_advance_id,omitempty" validate:"omitempty"`
	Items             []UpdatePurchaseOrderItemRequest `json:"items,omitempty" validate:"omitempty,dive"`
	AttachmentFileIDs []uuid.UUID                      `json:"attachment_file_ids,omitempty"`
}

type UpdatePurchaseOrderItemRequest struct {
	ID                 *uuid.UUID `json:"id,omitempty"` // For existing items
	IngredientID       *uuid.UUID `json:"ingredient_id,omitempty" validate:"omitempty"`
	PurchaseCategoryID *uuid.UUID `json:"purchase_category_id,omitempty" validate:"omitempty"`
	Description        *string    `json:"description,omitempty" validate:"omitempty"`
	Quantity           *float64   `json:"quantity,omitempty" validate:"omitempty,gt=0"`
	UnitID             *uuid.UUID `json:"unit_id,omitempty" validate:"omitempty"`
	Amount             *float64   `json:"amount,omitempty" validate:"omitempty,gte=0"`
}

type PurchaseOrderResponse struct {
	ID              uuid.UUID                         `json:"id"`
	OrganizationID  uuid.UUID                         `json:"organization_id"`
	OutletID        *uuid.UUID                        `json:"outlet_id"`
	VendorID        *uuid.UUID                        `json:"vendor_id"`
	PONumber        string                            `json:"po_number"`
	TransactionDate time.Time                         `json:"transaction_date"`
	DueDate         *time.Time                        `json:"due_date"`
	Reference       *string                           `json:"reference"`
	Status          string                            `json:"status"`
	Message         *string                           `json:"message"`
	TotalAmount     float64                           `json:"total_amount"`
	TeamScope       *string                           `json:"team_scope"`
	TeamCategoryID  *uuid.UUID                        `json:"team_category_id"`
	CashAdvanceID   *uuid.UUID                        `json:"cash_advance_id"`
	CreatedAt       time.Time                         `json:"created_at"`
	UpdatedAt       time.Time                         `json:"updated_at"`
	Team            *PurchaseTeamResponse             `json:"team,omitempty"`
	Vendor          *VendorResponse                   `json:"vendor,omitempty"`
	Items           []PurchaseOrderItemResponse       `json:"items,omitempty"`
	Attachments     []PurchaseOrderAttachmentResponse `json:"attachments,omitempty"`
}

// PurchaseTeamResponse is one entry of the team picker. Teams come from the parent
// product categories; Pusat is the extra entry that has no category behind it, so
// its CategoryID is null.
type PurchaseTeamResponse struct {
	Scope      string     `json:"scope"`
	CategoryID *uuid.UUID `json:"category_id"`
	Name       string     `json:"name"`
}

type ListPurchaseTeamsResponse struct {
	Teams []PurchaseTeamResponse `json:"teams"`
}

type PurchaseOrderItemResponse struct {
	ID                 uuid.UUID                 `json:"id"`
	PurchaseOrderID    uuid.UUID                 `json:"purchase_order_id"`
	IngredientID       *uuid.UUID                `json:"ingredient_id"`
	PurchaseCategoryID uuid.UUID                 `json:"purchase_category_id"`
	Description        *string                   `json:"description"`
	Quantity           *float64                  `json:"quantity"`
	UnitID             *uuid.UUID                `json:"unit_id"`
	Amount             float64                   `json:"amount"`
	CreatedAt          time.Time                 `json:"created_at"`
	UpdatedAt          time.Time                 `json:"updated_at"`
	Ingredient         *IngredientResponse       `json:"ingredient,omitempty"`
	PurchaseCategory   *PurchaseCategoryResponse `json:"purchase_category,omitempty"`
	Unit               *UnitResponse             `json:"unit,omitempty"`
}

type PurchaseOrderAttachmentResponse struct {
	ID              uuid.UUID     `json:"id"`
	PurchaseOrderID uuid.UUID     `json:"purchase_order_id"`
	FileID          uuid.UUID     `json:"file_id"`
	CreatedAt       time.Time     `json:"created_at"`
	File            *FileResponse `json:"file,omitempty"`
}

type ListPurchaseOrdersRequest struct {
	Page     int        `json:"page" validate:"min=1"`
	Limit    int        `json:"limit" validate:"min=1,max=100"`
	Search   string     `json:"search,omitempty"`
	Status   string     `json:"status,omitempty" validate:"omitempty,oneof=draft sent approved received cancelled"`
	VendorID *uuid.UUID `json:"vendor_id,omitempty"`
	// Team is the single-value form of the two filters below, so the team picker
	// can send back what it was given: a parent category id, "central" for Pusat,
	// or "none" for purchases with no team yet. It replaces them rather than
	// narrowing alongside them.
	Team           string     `json:"team,omitempty"`
	TeamScope      string     `json:"team_scope,omitempty" validate:"omitempty,oneof=category central"`
	TeamCategoryID *uuid.UUID `json:"team_category_id,omitempty"`
	StartDate      *time.Time `json:"start_date,omitempty"`
	EndDate        *time.Time `json:"end_date,omitempty"`
}

type ListPurchaseOrdersResponse struct {
	PurchaseOrders []PurchaseOrderResponse `json:"purchase_orders"`
	TotalCount     int                     `json:"total_count"`
	Page           int                     `json:"page"`
	Limit          int                     `json:"limit"`
	TotalPages     int                     `json:"total_pages"`
}

// Helper types for ingredient and unit responses
type IngredientResponse struct {
	ID   uuid.UUID `json:"id"`
	Name string    `json:"name"`
}

type UnitResponse struct {
	ID   uuid.UUID `json:"id"`
	Name string    `json:"name"`
}