package models

// FeeScheduleVersion identifies a fee schedule version.
type FeeScheduleVersion string

const (
	FeeVersion2005    FeeScheduleVersion = "2005"
	FeeVersion2013    FeeScheduleVersion = "2013"
	FeeVersion2021    FeeScheduleVersion = "2021"
	FeeVersion2025    FeeScheduleVersion = "2025"
	FeeVersionAktuell FeeScheduleVersion = "Aktuell"
)

// InstanceType identifies a court instance.
type InstanceType string

const (
	InstanceLG        InstanceType = "LG"
	InstanceOLG       InstanceType = "OLG"
	InstanceBGHNZB    InstanceType = "BGH_NZB"
	InstanceBGHRev    InstanceType = "BGH_Rev"
	InstanceBPatG     InstanceType = "BPatG"
	InstanceBGHNull   InstanceType = "BGH_Null"
	InstanceDPMA      InstanceType = "DPMA"
	InstanceBPatGCanc InstanceType = "BPatG_Canc"
)

// ProceedingPath identifies the type of patent litigation proceeding.
type ProceedingPath string

const (
	PathInfringement  ProceedingPath = "infringement"
	PathNullity       ProceedingPath = "nullity"
	PathCancellation  ProceedingPath = "cancellation"
)

// --- Request ---

// FeeCalculateRequest is the request body for POST /api/fees/calculate.
type FeeCalculateRequest struct {
	Streitwert           float64          `json:"streitwert"`
	VATRate              float64          `json:"vat_rate"`
	ProceedingPath       ProceedingPath   `json:"proceeding_path"`
	Instances            []InstanceInput  `json:"instances"`
	IncludeSecurityCosts bool             `json:"include_security_costs"`
}

// InstanceInput configures one court instance in the calculation request.
type InstanceInput struct {
	Type               InstanceType       `json:"type"`
	Enabled            bool               `json:"enabled"`
	FeeVersion         FeeScheduleVersion `json:"fee_version"`
	NumAttorneys       int                `json:"num_attorneys"`
	NumPatentAttorneys int                `json:"num_patent_attorneys"`
	NumClients         int                `json:"num_clients"`
	OralHearing        bool               `json:"oral_hearing"`
	ExpertFees         float64            `json:"expert_fees"`
}

// --- Response ---

// FeeCalculateResponse is the response for POST /api/fees/calculate.
type FeeCalculateResponse struct {
	Instances        []InstanceResult  `json:"instances"`
	Totals           []FeeTotal        `json:"totals"`
	SecurityForCosts *SecurityForCosts `json:"security_for_costs,omitempty"`
}

// InstanceResult contains the cost breakdown for one court instance.
type InstanceResult struct {
	Type                    InstanceType       `json:"type"`
	Label                   string             `json:"label"`
	CourtFeeBase            float64            `json:"court_fee_base"`
	CourtFeeMultiplier      float64            `json:"court_fee_multiplier"`
	CourtFeeSource          string             `json:"court_fee_source"`
	CourtFee                float64            `json:"court_fee"`
	ExpertFees              float64            `json:"expert_fees"`
	CourtSubtotal           float64            `json:"court_subtotal"`
	AttorneyBreakdown       *AttorneyBreakdown `json:"attorney_breakdown,omitempty"`
	PatentAttorneyBreakdown *AttorneyBreakdown `json:"patent_attorney_breakdown,omitempty"`
	AttorneySubtotal        float64            `json:"attorney_subtotal"`
	PatentAttorneySubtotal  float64            `json:"patent_attorney_subtotal"`
	InstanceTotal           float64            `json:"instance_total"`
}

// AttorneyBreakdown details the fee computation for one attorney type.
type AttorneyBreakdown struct {
	BaseFee       float64 `json:"base_fee"`
	VGFactor      float64 `json:"vg_factor"`
	VGFee         float64 `json:"vg_fee"`
	IncreaseFee   float64 `json:"increase_fee"`
	TGFactor      float64 `json:"tg_factor"`
	TGFee         float64 `json:"tg_fee"`
	Pauschale     float64 `json:"pauschale"`
	SubtotalNet   float64 `json:"subtotal_net"`
	VAT           float64 `json:"vat"`
	SubtotalGross float64 `json:"subtotal_gross"`
	Count         int     `json:"count"`
	TotalGross    float64 `json:"total_gross"`
}

// FeeTotal is a labeled total amount.
type FeeTotal struct {
	Label string  `json:"label"`
	Total float64 `json:"total"`
}

// SecurityForCosts is the Prozesskostensicherheit calculation result.
type SecurityForCosts struct {
	Instance1   float64 `json:"instance_1"`
	Instance2   float64 `json:"instance_2"`
	NZB         float64 `json:"nzb"`
	SubtotalNet float64 `json:"subtotal_net"`
	VAT         float64 `json:"vat"`
	TotalGross  float64 `json:"total_gross"`
}

// FeeScheduleInfo describes a fee schedule version for the schedules endpoint.
type FeeScheduleInfo struct {
	Key       string `json:"key"`
	Label     string `json:"label"`
	ValidFrom string `json:"valid_from"`
	IsAlias   bool   `json:"is_alias,omitempty"`
	AliasOf   string `json:"alias_of,omitempty"`
}