// Package models defines the domain types for the car maintenance tracker.
//
// The shapes mirror the original "Car Service.xlsx": one Car per sheet, a log
// of ServiceRecords (date + km, plus which parts were changed), and a per-car
// catalog of Parts (cols M/N). Derived fields follow the spreadsheet formulas:
//
//	Next Service Date = Service Date + ServiceIntervalDays   (Excel: A + 365)
//	Next Service Km   = Service Km   + ServiceIntervalKm     (Excel: B + 15000)
package models

import "time"

// Car corresponds to one worksheet in the original spreadsheet.
type Car struct {
	ID           string `json:"id"`
	Name         string `json:"name"`         // e.g. "Toyota Yaris"
	Make         string `json:"make"`         // e.g. "Toyota"
	Model        string `json:"model"`        // e.g. "Yaris"
	Year         int    `json:"year"`         // optional
	Registration        string `json:"registration"`        // optional plate
	RegistrationCountry string `json:"registrationCountry"` // optional (country of registration)
	VIN                 string `json:"vin"`                 // optional

	// Maintenance intervals, configurable per car. The spreadsheet hard-coded
	// 365 days and 15000 km; here they are stored so each car can differ.
	ServiceIntervalDays int `json:"serviceIntervalDays"`
	ServiceIntervalKm   int `json:"serviceIntervalKm"`

	// CurrentKm is the car's present odometer reading, updated by the user. Used
	// to flag km-based overdue service (current_km >= last service km + interval).
	CurrentKm int `json:"currentKm"`

	OilSpec             string `json:"oilSpec"`             // e.g. "Toyota Advanced Fuel Economy 0W20"
	TransmissionOilSpec string `json:"transmissionOilSpec"` // e.g. "Toyota WS"
	DifferentialOilSpec string `json:"differentialOilSpec"` // e.g. "SAE 75W-90 GL-5"
	BrakeFluidSpec      string `json:"brakeFluidSpec"`      // e.g. "DOT 4"
	CoolantSpec         string `json:"coolantSpec"`         // e.g. "Toyota Super Long Life Coolant"

	FuelType              string `json:"fuelType"`              // petrol | diesel | hybrid | electric
	BuildDate             string `json:"buildDate"`             // ISO YYYY-MM-DD (date-only)
	FirstRegistrationDate string `json:"firstRegistrationDate"` // ISO YYYY-MM-DD (date-only)

	// Owner is the user id that owns this car. Access is the requesting user's
	// permission on it — "owner", "write", or "read" — computed by the API at
	// read time and never persisted (omitempty; not part of the write payload).
	Owner  string `json:"owner,omitempty"`
	Access string `json:"access,omitempty"`

	Created string `json:"created,omitempty"`
	Updated string `json:"updated,omitempty"`
}

// ServiceRecord is one row of the Service log for a car.
type ServiceRecord struct {
	ID   string    `json:"id"`
	Car  string    `json:"car"`  // relation -> Car.ID
	Date time.Time `json:"date"` // service date (Excel col A)
	Km   int       `json:"km"`   // odometer at service (Excel col B)

	// "Changed Parts" checkboxes (Excel cols E/F/G).
	ChangedOil             bool `json:"changedOil"`             // Oil & Oil Filter
	ChangedEngineAirFilter bool `json:"changedEngineAirFilter"` // Engine Air Filter
	ChangedCabinAirFilter  bool `json:"changedCabinAirFilter"`  // Cabin Air Filter

	Notes string `json:"notes,omitempty"`

	// Derived (not stored): filled in by the API on read.
	NextServiceDate *time.Time `json:"nextServiceDate,omitempty"` // Excel col C
	NextServiceKm   *int       `json:"nextServiceKm,omitempty"`   // Excel col D

	Created string `json:"created,omitempty"`
	Updated string `json:"updated,omitempty"`
}

// Part is one entry in a car's parts catalog (Excel cols M/N).
type Part struct {
	ID         string `json:"id"`
	Car        string `json:"car"`        // relation -> Car.ID
	Name       string `json:"name"`       // e.g. "Oil Filter"
	PartNumber string `json:"partNumber"` // e.g. "04152-YZZA7"
	Category   string `json:"category"`   // optional: oil|filter|wiper|other

	Created string `json:"created,omitempty"`
	Updated string `json:"updated,omitempty"`
}

// User is the authenticated account's profile, covering the Settings panel's
// Account/Profile/Appearance sections.
type User struct {
	ID       string `json:"id"`
	Email    string `json:"email"`
	Verified bool   `json:"verified"`
	Name     string `json:"name"`
	Bio      string `json:"bio"`

	HasAvatar bool `json:"hasAvatar"`

	Theme      string `json:"theme"`      // light | dark | system
	Locale     string `json:"locale"`     // e.g. "en-US"
	DateFormat string `json:"dateFormat"` // YMD | DMY | MDY
	FontSize   string `json:"fontSize"`   // small | medium | large
	Role       string `json:"role"`       // user | admin

	// Non-empty while an account-deletion request is pending its cooldown.
	DeletionRequestedAt *time.Time `json:"deletionRequestedAt,omitempty"`

	Created string `json:"created,omitempty"`
}

// Session is one active login (device) for the current user.
type Session struct {
	ID          string    `json:"id"`
	DeviceLabel string    `json:"deviceLabel"`
	IP          string    `json:"ip"`
	Current     bool      `json:"current"`
	Created     time.Time `json:"created"`
	ExpiresAt   time.Time `json:"expiresAt"`
}

// ComputeDerived fills NextServiceDate / NextServiceKm from the car's intervals,
// reproducing the spreadsheet formulas. Intervals of 0 fall back to the
// spreadsheet defaults (365 days, 15000 km).
func (r *ServiceRecord) ComputeDerived(c *Car) {
	days := c.ServiceIntervalDays
	if days <= 0 {
		days = 365
	}
	km := c.ServiceIntervalKm
	if km <= 0 {
		km = 15000
	}
	if !r.Date.IsZero() {
		d := r.Date.AddDate(0, 0, days)
		r.NextServiceDate = &d
	}
	if r.Km > 0 {
		n := r.Km + km
		r.NextServiceKm = &n
	}
}