package platform

import (
	"context"
	"net/url"
	"sort"
	"strings"
)

type Store interface {
	DashboardSummary(context.Context) (DashboardSummary, error)
	Vehicles(context.Context, url.Values) (Page[VehicleRow], error)
	RealtimeLocations(context.Context, url.Values) (Page[RealtimeLocationRow], error)
	HistoryLocations(context.Context, url.Values) (Page[HistoryLocationRow], error)
	HistoryLocationsFromTDengine(context.Context, url.Values) (Page[HistoryLocationRow], error)
	RawFrames(context.Context, RawFrameQuery) (Page[RawFrameRow], error)
	DailyMileage(context.Context, url.Values) (Page[DailyMileageRow], error)
	QualityIssues(context.Context, url.Values) (Page[QualityIssueRow], error)
	OpsHealth(context.Context) (OpsHealth, error)
}

type RawFrameQuery struct {
	Protocol      string   `json:"protocol"`
	VIN           string   `json:"vin"`
	DateFrom      string   `json:"dateFrom"`
	DateTo        string   `json:"dateTo"`
	Fields        []string `json:"fields"`
	IncludeFields bool     `json:"includeFields"`
	Limit         int      `json:"limit"`
	Offset        int      `json:"offset"`
}

type Service struct {
	store Store
}

func NewService(store Store) *Service {
	return &Service{store: store}
}

func (s *Service) DashboardSummary(ctx context.Context) (DashboardSummary, error) {
	return s.store.DashboardSummary(ctx)
}

func (s *Service) Vehicles(ctx context.Context, query url.Values) (Page[VehicleRow], error) {
	return s.store.Vehicles(ctx, query)
}

func (s *Service) VehicleDetail(ctx context.Context, vin string, protocol string) (VehicleDetail, error) {
	vin = strings.TrimSpace(vin)
	protocol = strings.TrimSpace(protocol)
	vehicleQuery := url.Values{"keyword": {vin}, "limit": {"10"}}
	realtimeQuery := url.Values{"vin": {vin}, "limit": {"20"}}
	historyQuery := url.Values{"vin": {vin}, "limit": {"20"}}
	rawQuery := RawFrameQuery{VIN: vin, IncludeFields: true, Limit: 10}
	mileageQuery := url.Values{"vin": {vin}, "limit": {"20"}}
	if protocol != "" {
		realtimeQuery.Set("protocol", protocol)
		historyQuery.Set("protocol", protocol)
		rawQuery.Protocol = protocol
	}
	vehicles, err := s.store.Vehicles(ctx, vehicleQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	realtime, err := s.store.RealtimeLocations(ctx, realtimeQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	history, err := s.store.HistoryLocationsFromTDengine(ctx, historyQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	raw, err := s.RawFrames(ctx, rawQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	mileage, err := s.store.DailyMileage(ctx, mileageQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	var identity *VehicleRow
	for index := range vehicles.Items {
		if strings.EqualFold(vehicles.Items[index].VIN, vin) {
			identity = &vehicles.Items[index]
			break
		}
	}
	if identity == nil && len(vehicles.Items) > 0 {
		identity = &vehicles.Items[0]
	}
	return VehicleDetail{
		VIN:      vin,
		Identity: identity,
		Sources:  vehicleSources(vehicles.Items, realtime.Items, raw.Items, mileage.Items),
		Realtime: realtime.Items,
		History:  history,
		Raw:      raw,
		Mileage:  mileage,
	}, nil
}

func (s *Service) RealtimeLocations(ctx context.Context, query url.Values) (Page[RealtimeLocationRow], error) {
	return s.store.RealtimeLocations(ctx, query)
}

func (s *Service) HistoryLocations(ctx context.Context, query url.Values) (Page[HistoryLocationRow], error) {
	return s.store.HistoryLocationsFromTDengine(ctx, query)
}

func (s *Service) RawFrames(ctx context.Context, query RawFrameQuery) (Page[RawFrameRow], error) {
	if query.Limit <= 0 || query.Limit > 500 {
		query.Limit = 100
	}
	return s.store.RawFrames(ctx, query)
}

func (s *Service) DailyMileage(ctx context.Context, query url.Values) (Page[DailyMileageRow], error) {
	return s.store.DailyMileage(ctx, query)
}

func (s *Service) QualityIssues(ctx context.Context, query url.Values) (Page[QualityIssueRow], error) {
	return s.store.QualityIssues(ctx, query)
}

func (s *Service) OpsHealth(ctx context.Context) (OpsHealth, error) {
	return s.store.OpsHealth(ctx)
}

func vehicleSources(vehicles []VehicleRow, realtime []RealtimeLocationRow, raw []RawFrameRow, mileage []DailyMileageRow) []string {
	seen := map[string]struct{}{}
	add := func(value string) {
		value = strings.TrimSpace(value)
		if value == "" {
			return
		}
		seen[value] = struct{}{}
	}
	for _, row := range vehicles {
		add(row.Protocol)
	}
	for _, row := range realtime {
		add(row.Protocol)
	}
	for _, row := range raw {
		add(row.Protocol)
	}
	for _, row := range mileage {
		add(row.Source)
	}
	out := make([]string, 0, len(seen))
	for source := range seen {
		out = append(out, source)
	}
	sort.Strings(out)
	return out
}