package handler

import (
	"net/http"
	"strings"

	"github.com/go-chi/chi/v5"
	"github.com/google/uuid"

	"git.kundeng.us/phoenix/textsender-api/internal/store"
	"git.kundeng.us/phoenix/textsender-models/pkg/message/scheduling"
)

type RequestAddScheduledMessageEvent struct {
	RecipientId        uuid.UUID `json:"recipient_id"`
	MessageId          uuid.UUID `json:"message_id"`
	ScheduledMessageId uuid.UUID `json:"scheduled_message_id"`
}

type AddScheduledMessageEventResponse struct {
	Message string                             `json:"message"`
	Data    []scheduling.ScheduledMessageEvent `json:"data"`
}

type GetScheduledMessageEventResponse struct {
	Message string                             `json:"message"`
	Data    []scheduling.ScheduledMessageEvent `json:"data"`
}

type DeleteScheduledMessageEventResponse struct {
	Message string                             `json:"message"`
	Data    []scheduling.ScheduledMessageEvent `json:"data"`
}

type ScheduledMessageEventHandler struct {
	ScheduledMessageEventStore store.ScheduledMessageEventStore
	ScheduledMessageStore      store.ScheduledMessageStore
}

func NewScheduledMessageEventHandler(str store.ScheduledMessageEventStore, schStore store.ScheduledMessageStore) *ScheduledMessageEventHandler {
	return &ScheduledMessageEventHandler{ScheduledMessageEventStore: str, ScheduledMessageStore: schStore}
}

func (s *ScheduledMessageEventHandler) AddScheduledMessageEvent(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	var req RequestAddScheduledMessageEvent
	if err := ExtractFromRequest(r, &req); err != nil {
		http.Error(w, "Invalid JSON: "+err.Error(), http.StatusBadRequest)
	}
	defer r.Body.Close()

	event := scheduling.ScheduledMessageEvent{RecipientId: req.RecipientId, MessageId: req.MessageId, ScheduledMessageId: req.ScheduledMessageId}

	var statusCode int
	var resp AddScheduledMessageEventResponse

	if event.RecipientId == uuid.Nil {
		statusCode = http.StatusBadRequest
		resp.Message = "Recipient Id is nil"
	} else if event.MessageId == uuid.Nil {
		statusCode = http.StatusBadRequest
		resp.Message = "Message Id is nil"
	} else if event.ScheduledMessageId == uuid.Nil {
		statusCode = http.StatusBadRequest
		resp.Message = "Scheduled Message Id is nil"
	} else {
		ctx := r.Context()

		if schMsg, err := s.ScheduledMessageStore.Get(ctx, event.ScheduledMessageId); err != nil {
			statusCode = http.StatusInternalServerError
			resp.Message = err.Error()
		} else {
			if schMsg.Status == scheduling.Pending {
				if exists, err := s.ScheduledMessageEventStore.Exists(ctx, &event); err == nil {
					if exists {
						statusCode = http.StatusBadRequest
						resp.Message = "Event already present"
					} else {
						if err = s.ScheduledMessageEventStore.CreateScheduledMessageEvent(ctx, &event); err == nil {
							statusCode = http.StatusCreated
							resp.Message = "Successful"
							resp.Data = append(resp.Data, event)
						} else {
							statusCode = http.StatusInternalServerError
							resp.Message = err.Error()
						}
					}
				} else {
					statusCode = http.StatusInternalServerError
					resp.Message = err.Error()
				}
			} else {
				statusCode = http.StatusBadRequest
				resp.Message = "Scheduled message cannot be modified due to the status"
			}
		}
	}

	RespondWithJSON(w, statusCode, &resp)
}

func (s *ScheduledMessageEventHandler) GetScheduledMessageEvent(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Metnot allowed", http.StatusMethodNotAllowed)
		return
	}

	var id, scheduledMessageId uuid.UUID
	if idParam, err := ParseQueryParams(r, "id"); err == nil {
		id, err = uuid.Parse(*idParam)
	}
	if scheduledMessageIdParam, err := ParseQueryParams(r, "scheduled_message_id"); err == nil {
		scheduledMessageId, err = uuid.Parse(*scheduledMessageIdParam)
	}

	var statusCode int
	var resp GetScheduledMessageEventResponse
	ctx := r.Context()

	if id == uuid.Nil && scheduledMessageId == uuid.Nil {
		statusCode = http.StatusBadRequest
		resp.Message = "Query parameters missing"
	} else if id != uuid.Nil {
		if event, err := s.ScheduledMessageEventStore.Get(ctx, id); err != nil {
			resp.Message = err.Error()
			statusCode = http.StatusInternalServerError
		} else {
			if event != nil {
				resp.Message = "Successful"
				statusCode = http.StatusOK
				resp.Data = append(resp.Data, *event)
			} else {
				statusCode = http.StatusNotFound
				resp.Message = "Scheduled message event not found"
			}
		}
	} else {
		if events, err := s.ScheduledMessageEventStore.GetWithScheduleMessageId(ctx, scheduledMessageId); err != nil {
			statusCode = http.StatusInternalServerError
			resp.Message = err.Error()
		} else {
			statusCode = http.StatusOK
			resp.Message = "Successful"
			for _, event := range events {
				resp.Data = append(resp.Data, *event)
			}
		}
	}

	RespondWithJSON(w, statusCode, &resp)
}

func (s *ScheduledMessageEventHandler) DeleteScheduledMessageEvent(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodDelete {
		http.Error(w, "Metnot allowed", http.StatusMethodNotAllowed)
		return
	}

	id := chi.URLParam(r, "id")
	if len(id) == 0 {
		pathParts := strings.Split(r.URL.Path, "/")
		if len(pathParts) < 7 {
			http.Error(w, "Id not provided", http.StatusBadRequest)
			return
		} else {
			id = pathParts[6]
		}
	}

	var resp DeleteScheduledMessageEventResponse
	var statusCode int

	if parsedId, err := uuid.Parse(id); err != nil {
		resp.Message = err.Error()
		statusCode = http.StatusBadRequest
	} else {
		ctx := r.Context()
		if event, err := s.ScheduledMessageEventStore.Get(ctx, parsedId); err != nil {
			resp.Message = err.Error()
			statusCode = http.StatusInternalServerError
		} else {
			if schMsg, err := s.ScheduledMessageStore.Get(ctx, event.ScheduledMessageId); err != nil {
				resp.Message = err.Error()
				statusCode = http.StatusInternalServerError
			} else {
				if schMsg.Status == scheduling.Pending {
					if err = s.ScheduledMessageEventStore.Delete(ctx, event.Id); err != nil {
						resp.Message = err.Error()
						statusCode = http.StatusInternalServerError
					} else {
						resp.Message = "Successful"
						resp.Data = append(resp.Data, *event)
						statusCode = http.StatusOK
					}
				} else {
					statusCode = http.StatusBadRequest
					resp.Message = "Invalid status"
				}
			}
		}
	}

	RespondWithJSON(w, statusCode, &resp)
}