package chat

import (
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"strings"
	"time"

	"github.com/golang-jwt/jwt/v5"

	"git.simponic.xyz/simponic/phoneof/adapters/messaging"
	"git.simponic.xyz/simponic/phoneof/api/types"
	"git.simponic.xyz/simponic/phoneof/database"
)

func ValidateFren(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
	return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
		fren_id := req.FormValue("fren_id")
		fren, err := database.FindFren(context.DBConn, fren_id)
		if err != nil || fren == nil {
			log.Printf("err fetching friend %s %s", fren, err)
			resp.WriteHeader(http.StatusUnauthorized)
			return failure(context, req, resp)
		}
		context.User = fren
		(*context.TemplateData)["User"] = fren
		return success(context, req, resp)
	}
}

func FetchMessagesContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
	return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
		before := time.Now().UTC()
		var err error
		if req.FormValue("before") != "" {
			before, err = time.Parse(time.RFC3339, req.FormValue("before"))
			if err != nil {
				log.Printf("bad time: %s", err)
				resp.WriteHeader(http.StatusBadRequest)
				return failure(context, req, resp)
			}
		}

		query := database.ListMessageQuery{
			FrenId: context.User.Id,
			Before: before,
			Limit:  25,
		}
		messages, err := database.ListMessages(context.DBConn, query)
		if err != nil {
			log.Printf("err listing messages %v %s", query, err)
			resp.WriteHeader(http.StatusInternalServerError)
			return failure(context, req, resp)
		}

		(*context.TemplateData)["Messages"] = messages
		return success(context, req, resp)
	}
}

func SendMessageContinuation(messagingPipeline messaging.Continuation) func(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
	return func(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
		return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
			rawMessage := req.FormValue("message")
			now := time.Now().UTC()

			persist := messaging.PersistMessageContinuation(context.DBConn, context.User.Id, context.Id, now, true)
			var err error
			messaging.LogContinuation(messaging.Message{
				FrenName: context.User.Name,
				Message:  rawMessage,
			})(messagingPipeline, messaging.FailurePassingContinuation)(persist, messaging.FailurePassingContinuation)(messaging.IdContinuation, func(message messaging.Message) messaging.ContinuationChain {
				err = fmt.Errorf("err sending message from: %s %s", context.User, rawMessage)
				return messaging.FailurePassingContinuation(message)
			})

			if err != nil {
				// yeah this might be a 400 or whatever, i’ll fix it later
				resp.WriteHeader(http.StatusInternalServerError)
				return failure(context, req, resp)
			}
			return success(context, req, resp)
		}
	}
}

type Timestamp struct {
	time.Time
}

func (p *Timestamp) UnmarshalJSON(bytes []byte) error {
	var raw string
	err := json.Unmarshal(bytes, &raw)

	if err != nil {
		log.Printf("error decoding timestamp: %s\n", err)
		return err
	}

	p.Time, err = time.Parse(time.RFC3339, raw)
	if err != nil {
		log.Printf("error decoding timestamp: %s\n", err)
		return err
	}

	return nil
}

type HttpSmsEventData struct {
	Contact   string    `json:"contact"`
	Content   string    `json:"content"`
	Owner     string    `json:"owner"`
	Timestamp time.Time `json:"timestamp"`
}
type HttpSmsEvent struct {
	Data HttpSmsEventData `json:"data"`
	Type string           `json:"type"`
	Id   string           `json:"id"`
}

func ChatEventProcessorContinuation(allowedFrom string, signingKey string, messagingPipeline messaging.Continuation) func(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
	return func(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
		return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
			// check signing
			joken := strings.Split(req.Header.Get("Authorization"), "Bearer ")
			_, err := jwt.Parse(joken[1], func(token *jwt.Token) (interface{}, error) {
				return []byte(signingKey), nil
			})
			if err != nil {
				log.Printf("invalid jwt %s", err)
				resp.WriteHeader(http.StatusBadRequest)
				return failure(context, req, resp)
			}

			// decode the event
			defer req.Body.Close()
			body, err := io.ReadAll(req.Body)
			if err != nil {
				log.Printf("err reading body")
				resp.WriteHeader(http.StatusInternalServerError)
				return failure(context, req, resp)
			}

			var event HttpSmsEvent
			err = json.Unmarshal(body, &event)
			if err != nil {
				log.Printf("err unmarshaling body")
				resp.WriteHeader(http.StatusBadRequest)
				return failure(context, req, resp)
			}

			// we only care about received messages
			if event.Type != "message.phone.received" {
				log.Printf("got non-receive event %s", event.Type)
				return success(context, req, resp)
			}
			if event.Data.Contact != allowedFrom {
				log.Printf("someone did something naughty %s", event.Data.Contact)
				return success(context, req, resp)
			}

			message, err := messaging.Decode(event.Data.Content)
			if err != nil {
				log.Printf("err when decoding message %s", err)
				resp.WriteHeader(http.StatusBadRequest)
				return failure(context, req, resp)
			}

			fren, err := database.FindFrenByName(context.DBConn, message.FrenName)
			if err != nil {
				log.Printf("err when getting fren %s %s", fren.Name, err)
				resp.WriteHeader(http.StatusBadRequest)
				return failure(context, req, resp)
			}

			persist := messaging.PersistMessageContinuation(context.DBConn, fren.Id, context.Id, event.Data.Timestamp, false)
			messaging.LogContinuation(*message)(messagingPipeline, messaging.FailurePassingContinuation)(persist, messaging.FailurePassingContinuation)(messaging.IdContinuation, func(message messaging.Message) messaging.ContinuationChain {
				err = fmt.Errorf("err propagating stuff for message %s", message)
				return messaging.FailurePassingContinuation(message)
			})
			if err != nil {
				resp.WriteHeader(http.StatusInternalServerError)
				return failure(context, req, resp)
			}
			return success(context, req, resp)
		}
	}

}