package model

import "time"

// Material represents a material in the warehouse
type Material struct {
	ID            int64     `json:"id"`
	MaterialCode  string    `json:"material_code"`
	Name          string    `json:"name"`
	MaterialImage *string   `json:"material_image,omitempty"`
	Spec          string    `json:"spec,omitempty"`
	Category      string    `json:"category,omitempty"`
	Unit          string    `json:"unit,omitempty"`
	WarningStock  int       `json:"warning_stock"`
	CurrentStock  int       `json:"current_stock,omitempty"`
	CreatedAt     time.Time `json:"created_at"`
	UpdatedAt     time.Time `json:"updated_at"`
}

// Tag represents a tag associated with a material
type Tag struct {
	ID         int64     `json:"id"`
	MaterialID int64     `json:"material_id"`
	TagCode    string    `json:"tag_code"`
	CreatedAt  time.Time `json:"created_at"`
}

// ApplyOrder represents a material application/requisition order
type ApplyOrder struct {
	ID             int64      `json:"id"`
	Applicant      string     `json:"applicant"`
	ApplyDate      time.Time  `json:"apply_date"`
	Status         string     `json:"status"`
	ApprovalComment string    `json:"approval_comment,omitempty"`
	CreatedAt      time.Time  `json:"created_at"`
	UpdatedAt      time.Time  `json:"updated_at"`
}

// ApplyItem represents an item in an application order
type ApplyItem struct {
	ID            int64  `json:"id"`
	ApplyOrderID  int64  `json:"apply_order_id"`
	MaterialID    int64  `json:"material_id"`
	Quantity      int    `json:"quantity"`
	Purpose       string `json:"purpose,omitempty"`
}

// InboundOrder represents an inbound order
type InboundOrder struct {
	ID          int64        `json:"id"`
	InboundDate time.Time    `json:"inbound_date"`
	Handler     string       `json:"handler"`
	Supplier    string       `json:"supplier"`
	CreatedAt   time.Time    `json:"created_at"`
	UpdatedAt   time.Time    `json:"updated_at,omitempty"`
	Status      string       `json:"status,omitempty"`
	Items       []InboundItem `json:"items,omitempty"`
}

// InboundItem represents an item in an inbound order
type InboundItem struct {
	ID             int64  `json:"id"`
	InboundOrderID int64  `json:"inbound_order_id"`
	MaterialID     int64  `json:"material_id"`
	Quantity       int    `json:"quantity"`
	MaterialCode   string `json:"material_code,omitempty"`
	MaterialName   string `json:"material_name,omitempty"`
}

// OutboundOrder represents an outbound order
type OutboundOrder struct {
	ID           int64         `json:"id"`
	OutboundDate time.Time     `json:"outbound_date"`
	Handler      string        `json:"handler"`
	Receiver     string        `json:"receiver"`
	CreatedAt    time.Time     `json:"created_at"`
	UpdatedAt    time.Time     `json:"updated_at,omitempty"`
	Status       string        `json:"status,omitempty"`
	Items        []OutboundItem `json:"items,omitempty"`
}

// OutboundItem represents an item in an outbound order
type OutboundItem struct {
	ID              int64  `json:"id"`
	OutboundOrderID int64  `json:"outbound_order_id"`
	MaterialID      int64  `json:"material_id"`
	Quantity        int    `json:"quantity"`
	MaterialCode    string `json:"material_code,omitempty"`
	MaterialName    string `json:"material_name,omitempty"`
}

// StockLog represents a stock change log
type StockLog struct {
	ID               int64     `json:"id"`
	MaterialID       int64     `json:"material_id"`
	Type             string    `json:"type"`
	Quantity         int       `json:"quantity"`
	RelatedOrderType string    `json:"related_order_type"`
	RelatedOrderID   int64     `json:"related_order_id"`
	CreatedAt        time.Time `json:"created_at"`
	RunningBalance   int       `json:"running_balance,omitempty"`
}

// Stock represents stock information with material details
type Stock struct {
	MaterialID   int64  `json:"material_id"`
	MaterialCode string `json:"material_code"`
	Name         string `json:"name"`
	Spec         string `json:"spec,omitempty"`
	Category     string `json:"category,omitempty"`
	Unit         string `json:"unit,omitempty"`
	CurrentStock int    `json:"current_stock"`
	WarningStock int    `json:"warning_stock"`
}

// StockLogResponse represents a stock log with computed balance
type StockLogResponse struct {
	ID             int64     `json:"id"`
	MaterialID     int64     `json:"material_id"`
	ChangeType     string    `json:"change_type"`
	ChangeQuantity int       `json:"change_quantity"`
	BeforeQuantity int       `json:"before_quantity"`
	AfterQuantity  int       `json:"after_quantity"`
	ReferenceID    int64     `json:"reference_id"`
	ReferenceType  string    `json:"reference_type"`
	CreatedAt      time.Time `json:"created_at"`
}

// InboundRecord represents inbound records for a specific material
type InboundRecord struct {
	ID       int64     `json:"id"`
	InboundID int64    `json:"inbound_id"`
	Handler  string    `json:"handler"`
	Supplier string    `json:"supplier"`
	Quantity int       `json:"quantity"`
	CreatedAt time.Time `json:"created_at"`
}

// OutboundRecord represents outbound records for a specific material
type OutboundRecord struct {
	ID        int64     `json:"id"`
	OutboundID int64    `json:"outbound_id"`
	Handler   string    `json:"handler"`
	Receiver  string    `json:"receiver"`
	Quantity  int       `json:"quantity"`
	CreatedAt time.Time `json:"created_at"`
}

// ============= Request DTOs =============

// CreateMaterialRequest represents the request to create a material
type CreateMaterialRequest struct {
	MaterialCode  string `json:"material_code" binding:"required"`
	Name          string `json:"name" binding:"required"`
	MaterialImage string `json:"material_image"`
	Spec          string `json:"spec"`
	Category      string `json:"category"`
	Unit          string `json:"unit"`
	WarningStock  int    `json:"warning_stock"`
}

// UpdateMaterialRequest represents the request to update a material
type UpdateMaterialRequest struct {
	MaterialCode  string `json:"material_code"`
	Name          string `json:"name"`
	MaterialImage string `json:"material_image"`
	Spec          string `json:"spec"`
	Category      string `json:"category"`
	Unit          string `json:"unit"`
	WarningStock  int    `json:"warning_stock"`
}

// CreateInboundRequest represents the request to create an inbound order
type CreateInboundRequest struct {
	Handler  string `json:"handler" binding:"required"`
	Supplier string `json:"supplier" binding:"required"`
	Items    []struct {
		MaterialID int64 `json:"material_id" binding:"required"`
		Quantity   int   `json:"quantity" binding:"required,gt=0"`
	} `json:"items" binding:"required,min=1"`
}

// CreateOutboundRequest represents the request to create an outbound order
type CreateOutboundRequest struct {
	Handler  string `json:"handler" binding:"required"`
	Receiver string `json:"receiver" binding:"required"`
	Items    []struct {
		MaterialID int64 `json:"material_id" binding:"required"`
		Quantity   int   `json:"quantity" binding:"required,gt=0"`
	} `json:"items" binding:"required,min=1"`
}

// UpdateInboundRequest represents the request to update an inbound order
type UpdateInboundRequest struct {
	Handler  string `json:"handler"`
	Supplier string `json:"supplier"`
	Items    []struct {
		MaterialID int64 `json:"material_id" binding:"required"`
		Quantity   int   `json:"quantity" binding:"required,gt=0"`
	} `json:"items" binding:"required,min=1"`
}

// UpdateOutboundRequest represents the request to update an outbound order
type UpdateOutboundRequest struct {
	Handler  string `json:"handler"`
	Receiver string `json:"receiver"`
	Items    []struct {
		MaterialID int64 `json:"material_id" binding:"required"`
		Quantity   int   `json:"quantity" binding:"required,gt=0"`
	} `json:"items" binding:"required,min=1"`
}

// MaterialLog represents a material change log
type MaterialLog struct {
	ID            int64     `json:"id"`
	OperationType string    `json:"operation_type"`
	MaterialID    int64     `json:"material_id"`
	OldValue      string    `json:"old_value,omitempty"`
	NewValue      string    `json:"new_value,omitempty"`
	Operator      string    `json:"operator,omitempty"`
	Description   string    `json:"description,omitempty"`
	CreatedAt     time.Time `json:"created_at"`
}

// User represents a system user
type User struct {
	ID          int64     `json:"id"`
	Username    string    `json:"username"`
	Password    string    `json:"-"`
	Role        string    `json:"role"`
	Description string    `json:"description"`
	CreatedAt   time.Time `json:"created_at"`
}

// LoginRequest represents login request
type LoginRequest struct {
	Username string `json:"username" binding:"required"`
	Password string `json:"password" binding:"required"`
}

// LoginResponse represents login response
type LoginResponse struct {
	Token string `json:"token"`
	User  User   `json:"user"`
}

// ApplicationStatus constants
const (
	ApplicationStatusPending   = "pending"
	ApplicationStatusApproved  = "approved"
	ApplicationStatusRejected  = "rejected"
	ApplicationStatusCancelled = "cancelled"
)

// MaterialApplication represents a material application record
type MaterialApplication struct {
	ID              int64            `json:"id"`
	UserID          int64            `json:"user_id"`
	Username        string           `json:"username"`
	Purpose         string           `json:"purpose,omitempty"`
	Status          string           `json:"status"`
	RejectionReason string           `json:"rejection_reason,omitempty"`
	ApprovedBy      int64            `json:"approved_by,omitempty"`
	ApproverName    string           `json:"approver_name,omitempty"`
	CreatedAt       time.Time        `json:"created_at"`
	UpdatedAt       time.Time        `json:"updated_at"`
	Items           []ApplicationItem `json:"items,omitempty"`
}

// CreateApplicationRequest represents request to create application
type CreateApplicationRequest struct {
	Purpose string `json:"purpose"`
	Items   []struct {
		MaterialID int64 `json:"material_id" binding:"required"`
		Quantity   int   `json:"quantity" binding:"required,gt=0"`
	} `json:"items" binding:"required,min=1"`
}

// ApplicationItem represents an item in a material application
type ApplicationItem struct {
	ID            int64  `json:"id"`
	ApplicationID int64  `json:"application_id"`
	MaterialID    int64  `json:"material_id"`
	MaterialCode string `json:"material_code"`
	MaterialName string `json:"material_name"`
	Quantity     int    `json:"quantity"`
}

// ApproveApplicationRequest represents request to approve application
type ApproveApplicationRequest struct {
	AutoOutbound bool `json:"auto_outbound"`
}

// RejectApplicationRequest represents request to reject application
type RejectApplicationRequest struct {
	Reason string `json:"reason" binding:"required"`
}