package application

import (
	"context"
	"encoding/json"
	"fmt"
	"sort"
	"strconv"

	"git.coopgo.io/coopgo-apps/parcoursmob/core/utils/sorting"
	agenda "git.coopgo.io/coopgo-platform/agenda/grpcapi"
	agendastorage "git.coopgo.io/coopgo-platform/agenda/storage"
	fleets "git.coopgo.io/coopgo-platform/fleets/grpcapi"
	fleetsstorage "git.coopgo.io/coopgo-platform/fleets/storage"
	groupsmanagement "git.coopgo.io/coopgo-platform/groups-management/grpcapi"
	groupsstorage "git.coopgo.io/coopgo-platform/groups-management/storage"
	accounts "git.coopgo.io/coopgo-platform/mobility-accounts/grpcapi"
	accountsstorage "git.coopgo.io/coopgo-platform/mobility-accounts/storage"
	"github.com/xuri/excelize/v2"
)

type FlatMaps []map[string]any

func (maps FlatMaps) GetHeaders() (res []string) {
	keys := map[string]bool{}
	for _, m := range maps {
		for k, _ := range m {
			if _, ok := keys[k]; !ok {
				keys[k] = true
				res = append(res, k)
			}
		}
	}
	sort.Strings(res)
	return
}

func (maps FlatMaps) GetValues() (res [][]string) {
	headers := maps.GetHeaders()
	for _, m := range maps {
		line := []string{}
		for _, k := range headers {
			if v, ok := m[k]; ok && v != nil {
				line = append(line, fmt.Sprint(v))
			} else {
				line = append(line, "")
			}
		}
		res = append(res, line)
	}
	return
}

type ExportCacheResult struct {
	Headers []string
	Values  [][]string
}

func (h *ApplicationHandler) ExportCacheAsCSV(cacheID string) (*ExportCacheResult, error) {
	d, err := h.cache.Get(cacheID)
	if err != nil {
		return nil, err
	}

	var data []any
	if dataSlice, ok := d.([]any); ok {
		data = dataSlice
	} else {
		// Convert single item to slice
		jsonData, err := json.Marshal(d)
		if err != nil {
			return nil, err
		}
		if err := json.Unmarshal(jsonData, &data); err != nil {
			return nil, err
		}
	}

	flatmaps := FlatMaps{}
	for _, v := range data {
		if vMap, ok := v.(map[string]any); ok {
			fm := map[string]any{}
			flatten("", vMap, fm)
			flatmaps = append(flatmaps, fm)
		}
	}

	return &ExportCacheResult{
		Headers: flatmaps.GetHeaders(),
		Values:  flatmaps.GetValues(),
	}, nil
}

func flatten(prefix string, src map[string]any, dest map[string]any) {
	if len(prefix) > 0 {
		prefix += "."
	}
	for k, v := range src {
		switch child := v.(type) {
		case map[string]any:
			flatten(prefix+k, child, dest)
		case []any:
			for i := 0; i < len(child); i++ {
				dest[prefix+k+"."+strconv.Itoa(i)] = child[i]
			}
		default:
			dest[prefix+k] = v
		}
	}
}

type AgendaExportResult struct {
	ExcelFile *excelize.File
}

func (h *ApplicationHandler) ExportAllAgendaEvents() (*AgendaExportResult, error) {
	resp, err := h.services.GRPC.Agenda.GetEvents(context.TODO(), &agenda.GetEventsRequest{
		Namespaces: []string{"parcoursmob_dispositifs"},
	})
	if err != nil {
		return nil, err
	}

	events := []agendastorage.Event{}
	groupids := []string{}
	beneficiaries_ids := []string{}

	for _, e := range resp.Events {
		groupids = append(groupids, e.Owners...)
		events = append(events, e.ToStorageType())

		for _, subscriptions := range e.Subscriptions {
			beneficiaries_ids = append(beneficiaries_ids, subscriptions.Subscriber)
		}
	}

	sort.Sort(sorting.EventsByStartdate(events))

	groups, beneficiaries_map, err := h.getAgendaMetadata(groupids, beneficiaries_ids)
	if err != nil {
		return nil, err
	}

	file := h.generateAgendaExcel(events, groups, beneficiaries_map)
	return &AgendaExportResult{ExcelFile: file}, nil
}

func (h *ApplicationHandler) ExportSingleAgendaEvent(eventID string) (*AgendaExportResult, error) {
	resp, err := h.services.GRPC.Agenda.GetEvent(context.TODO(), &agenda.GetEventRequest{
		Id: eventID,
	})
	if err != nil {
		return nil, err
	}

	groupids := []string{}
	beneficiaries_ids := []string{}
	groupids = append(groupids, resp.Event.Owners...)

	for _, subscriptions := range resp.Event.Subscriptions {
		beneficiaries_ids = append(beneficiaries_ids, subscriptions.Subscriber)
	}

	groups, beneficiaries_map, err := h.getAgendaMetadata(groupids, beneficiaries_ids)
	if err != nil {
		return nil, err
	}

	events := []agendastorage.Event{resp.Event.ToStorageType()}
	file := h.generateAgendaExcel(events, groups, beneficiaries_map)
	return &AgendaExportResult{ExcelFile: file}, nil
}

func (h *ApplicationHandler) getAgendaMetadata(groupids, beneficiaries_ids []string) (map[string]groupsstorage.Group, map[string]accountsstorage.Account, error) {
	groupsresp, err := h.services.GRPC.GroupsManagement.GetGroupsBatch(context.TODO(), &groupsmanagement.GetGroupsBatchRequest{
		Groupids: groupids,
	})

	groups := map[string]groupsstorage.Group{}
	if err == nil {
		for _, g := range groupsresp.Groups {
			groups[g.Id] = g.ToStorageType()
		}
	}

	beneficiaries, err := h.services.GRPC.MobilityAccounts.GetAccountsBatch(context.TODO(), &accounts.GetAccountsBatchRequest{
		Accountids: beneficiaries_ids,
	})
	if err != nil {
		return nil, nil, err
	}

	beneficiaries_map := map[string]accountsstorage.Account{}
	for _, ben := range beneficiaries.Accounts {
		beneficiaries_map[ben.Id] = ben.ToStorageType()
	}

	return groups, beneficiaries_map, nil
}

func (h *ApplicationHandler) generateAgendaExcel(events []agendastorage.Event, groups map[string]groupsstorage.Group, beneficiaries_map map[string]accountsstorage.Account) *excelize.File {
	f := excelize.NewFile()

	f.SetCellValue("Sheet1", "A1", "Evénement")
	f.SetCellValue("Sheet1", "B1", "Date de début")
	f.SetCellValue("Sheet1", "C1", "Date de fin")
	f.SetCellValue("Sheet1", "D1", "Nom bénéficiaire")
	f.SetCellValue("Sheet1", "E1", "Prenom bénéficiaire")
	f.SetCellValue("Sheet1", "F1", "Numéro allocataire / Pole emploi")
	f.SetCellValue("Sheet1", "G1", "Prescipteur")
	f.SetCellValue("Sheet1", "H1", "Prescipteur Nom")
	f.SetCellValue("Sheet1", "I1", "Prescipteur Email")
	f.SetCellValue("Sheet1", "J1", "Gestionnaire événement")

	i := 2
	for _, e := range events {
		if len(e.Owners) == 0 {
			continue
		}
		admin := groups[e.Owners[0]]

		for _, s := range e.Subscriptions {
			subscribedbygroup := ""
			subscribedbyuser := ""
			subscribedbyemail := ""
			if v, ok := s.Data["subscribed_by"].(map[string]any); ok {
				if v2, ok := v["group"].(map[string]any); ok {
					if v3, ok := v2["name"].(string); ok {
						subscribedbygroup = v3
					}
				}
				if v4, ok := v["user"].(map[string]any); ok {
					if v5, ok := v4["display_name"].(string); ok {
						subscribedbyuser = v5
					}
					if v6, ok := v4["email"].(string); ok {
						subscribedbyemail = v6
					}
				}
			}

			beneficiary := beneficiaries_map[s.Subscriber]

			f.SetCellValue("Sheet1", fmt.Sprintf("A%d", i), e.Name)
			f.SetCellValue("Sheet1", fmt.Sprintf("B%d", i), e.Startdate.Format("2006-01-02"))
			f.SetCellValue("Sheet1", fmt.Sprintf("C%d", i), e.Enddate.Format("2006-01-02"))
			f.SetCellValue("Sheet1", fmt.Sprintf("D%d", i), beneficiary.Data["last_name"])
			f.SetCellValue("Sheet1", fmt.Sprintf("E%d", i), beneficiary.Data["first_name"])
			f.SetCellValue("Sheet1", fmt.Sprintf("F%d", i), beneficiary.Data["file_number"])
			f.SetCellValue("Sheet1", fmt.Sprintf("G%d", i), subscribedbygroup)
			f.SetCellValue("Sheet1", fmt.Sprintf("H%d", i), subscribedbyuser)
			f.SetCellValue("Sheet1", fmt.Sprintf("I%d", i), subscribedbyemail)
			f.SetCellValue("Sheet1", fmt.Sprintf("J%d", i), admin.Data["name"])
			i = i + 1
		}
	}
	return f
}

type FleetBookingsExportResult struct {
	ExcelFile *excelize.File
}

func (h *ApplicationHandler) ExportAllFleetBookings() (*FleetBookingsExportResult, error) {
	vehicles, bookings, err := h.getFleetData()
	if err != nil {
		return nil, err
	}

	groups, beneficiaries_map, err := h.getFleetMetadata(bookings)
	if err != nil {
		return nil, err
	}

	file := h.generateFleetExcel(bookings, vehicles, groups, beneficiaries_map, "")
	return &FleetBookingsExportResult{ExcelFile: file}, nil
}

func (h *ApplicationHandler) ExportFleetBookingsByGroup(groupID string) (*FleetBookingsExportResult, error) {
	vehicles, bookings, err := h.getFleetData()
	if err != nil {
		return nil, err
	}

	groups, beneficiaries_map, err := h.getFleetMetadata(bookings)
	if err != nil {
		return nil, err
	}

	file := h.generateFleetExcel(bookings, vehicles, groups, beneficiaries_map, groupID)
	return &FleetBookingsExportResult{ExcelFile: file}, nil
}

func (h *ApplicationHandler) getFleetData() (map[string]fleetsstorage.Vehicle, []fleetsstorage.Booking, error) {
	vehicles := map[string]fleetsstorage.Vehicle{}
	bookings := []fleetsstorage.Booking{}

	request := &fleets.GetVehiclesRequest{
		Namespaces: []string{"parcoursmob"},
	}
	resp, err := h.services.GRPC.Fleets.GetVehicles(context.TODO(), request)
	if err != nil {
		return nil, nil, err
	}

	for _, vehicle := range resp.Vehicles {
		v := vehicle.ToStorageType()
		for _, b := range v.Bookings {
			bookings = append(bookings, b)
		}
		vehicles[vehicle.Id] = v
	}

	return vehicles, bookings, nil
}

func (h *ApplicationHandler) getFleetMetadata(bookings []fleetsstorage.Booking) (map[string]groupsstorage.Group, map[string]accountsstorage.Account, error) {
	beneficiaries_ids := []string{}
	for _, b := range bookings {
		beneficiaries_ids = append(beneficiaries_ids, b.Driver)
	}

	groups := map[string]groupsstorage.Group{}
	admingroups, err := h.services.GRPC.GroupsManagement.GetGroups(context.TODO(), &groupsmanagement.GetGroupsRequest{
		Namespaces: []string{"parcoursmob_organizations"},
	})
	if err != nil {
		return nil, nil, err
	}

	for _, g := range admingroups.Groups {
		groups[g.Id] = g.ToStorageType()
	}

	beneficiaries, err := h.services.GRPC.MobilityAccounts.GetAccountsBatch(context.TODO(), &accounts.GetAccountsBatchRequest{
		Accountids: beneficiaries_ids,
	})
	if err != nil {
		return nil, nil, err
	}

	beneficiaries_map := map[string]accountsstorage.Account{}
	for _, ben := range beneficiaries.Accounts {
		beneficiaries_map[ben.Id] = ben.ToStorageType()
	}

	return groups, beneficiaries_map, nil
}

func (h *ApplicationHandler) generateFleetExcel(bookings []fleetsstorage.Booking, vehicles map[string]fleetsstorage.Vehicle, groups map[string]groupsstorage.Group, beneficiaries_map map[string]accountsstorage.Account, filterGroupID string) *excelize.File {
	f := excelize.NewFile()

	f.SetCellValue("Sheet1", "A1", "Numéro")
	f.SetCellValue("Sheet1", "B1", "Type")
	f.SetCellValue("Sheet1", "C1", "Gestionnaire")
	f.SetCellValue("Sheet1", "D1", "Prescripteur")
	f.SetCellValue("Sheet1", "E1", "Bénéficiaire")
	f.SetCellValue("Sheet1", "F1", "Numéro allocataire / Pole emploi")
	f.SetCellValue("Sheet1", "G1", "Début de Mise à disposition")
	f.SetCellValue("Sheet1", "H1", "Fin de mise à disposition")
	f.SetCellValue("Sheet1", "I1", "Début indisponibilité")
	f.SetCellValue("Sheet1", "J1", "Fin indisponibilité")
	f.SetCellValue("Sheet1", "K1", "Véhicule retiré")
	f.SetCellValue("Sheet1", "L1", "Commentaire - Retrait véhicule")
	f.SetCellValue("Sheet1", "M1", "Réservation supprimée")
	f.SetCellValue("Sheet1", "N1", "Motif de la suppression")

	i := 2
	for _, b := range bookings {
		vehicle := vehicles[b.Vehicleid]
		if len(vehicle.Administrators) == 0 {
			continue
		}
		admin := groups[vehicle.Administrators[0]]

		bookedby := ""
		if v, ok := b.Data["booked_by"].(map[string]any); ok {
			if v2, ok := v["user"].(map[string]any); ok {
				if v3, ok := v2["display_name"].(string); ok {
					bookedby = v3
				}
			}
		}

		bookedbygroup := ""
		if v4, ok := b.Data["booked_by"].(map[string]any); ok {
			if v5, ok := v4["group"].(map[string]any); ok {
				if v6, ok := v5["id"].(string); ok {
					bookedbygroup = v6
				}
			}
		}

		// Filter by group if specified
		if filterGroupID != "" && bookedbygroup != filterGroupID {
			continue
		}

		beneficiary := beneficiaries_map[b.Driver]
		adminunavailability := false

		if av, ok := b.Data["administrator_unavailability"].(bool); ok && av {
			adminunavailability = true
		}

		deleted := ""
		if b.Deleted {
			deleted = "DELETED"
		}

		f.SetCellValue("Sheet1", fmt.Sprintf("A%d", i), vehicle.Data["licence_plate"])
		f.SetCellValue("Sheet1", fmt.Sprintf("B%d", i), vehicle.Type)
		f.SetCellValue("Sheet1", fmt.Sprintf("C%d", i), admin.Data["name"])
		f.SetCellValue("Sheet1", fmt.Sprintf("D%d", i), bookedby)
		f.SetCellValue("Sheet1", fmt.Sprintf("E%d", i), fmt.Sprintf("%v %v", beneficiary.Data["first_name"], beneficiary.Data["last_name"]))
		f.SetCellValue("Sheet1", fmt.Sprintf("F%d", i), beneficiary.Data["file_number"])
		f.SetCellValue("Sheet1", fmt.Sprintf("G%d", i), b.Startdate.Format("2006-01-02"))
		f.SetCellValue("Sheet1", fmt.Sprintf("H%d", i), b.Enddate.Format("2006-01-02"))
		f.SetCellValue("Sheet1", fmt.Sprintf("I%d", i), b.Unavailablefrom.Format("2006-01-02"))
		f.SetCellValue("Sheet1", fmt.Sprintf("J%d", i), b.Unavailableto.Format("2006-01-02"))
		f.SetCellValue("Sheet1", fmt.Sprintf("K%d", i), adminunavailability)
		f.SetCellValue("Sheet1", fmt.Sprintf("L%d", i), b.Data["comment"])
		f.SetCellValue("Sheet1", fmt.Sprintf("M%d", i), deleted)
		f.SetCellValue("Sheet1", fmt.Sprintf("N%d", i), b.Data["motif"])
		i = i + 1
	}

	return f
}