package api

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"time"

	"github.com/gorilla/mux"

	"openreplay/backend/pkg/logger"
	"openreplay/backend/pkg/objectstorage"
	"openreplay/backend/pkg/server/api"
	"openreplay/backend/pkg/sessions"
	"openreplay/backend/pkg/token"
	"openreplay/backend/pkg/uxtesting"
)

type handlersImpl struct {
	log           logger.Logger
	responser     *api.Responser
	jsonSizeLimit int64
	tokenizer     *token.Tokenizer
	sessions      sessions.Sessions
	uxTesting     uxtesting.UXTesting
	objStorage    objectstorage.ObjectStorage
}

func NewHandlers(log logger.Logger, responser *api.Responser, jsonSizeLimit int64, tokenizer *token.Tokenizer, sessions sessions.Sessions,
	uxTesting uxtesting.UXTesting, objStorage objectstorage.ObjectStorage) (api.Handlers, error) {
	return &handlersImpl{
		log:           log,
		responser:     responser,
		jsonSizeLimit: jsonSizeLimit,
		tokenizer:     tokenizer,
		sessions:      sessions,
		uxTesting:     uxTesting,
		objStorage:    objStorage,
	}, nil
}

func (e *handlersImpl) GetAll() []*api.Description {
	return []*api.Description{
		{"/v1/web/uxt/signals/test", e.sendUXTestSignal, "POST"},
		{"/v1/web/uxt/signals/task", e.sendUXTaskSignal, "POST"},
		{"/v1/web/uxt/test/{id}", e.getUXTestInfo, "GET"},
		{"/v1/web/uxt/upload-url", e.getUXUploadUrl, "GET"},
	}
}

func (e *handlersImpl) getUXTestInfo(w http.ResponseWriter, r *http.Request) {
	startTime := time.Now()
	bodySize := 0

	// Check authorization
	sessionData, err := e.tokenizer.ParseFromHTTPRequest(r)
	if sessionData != nil {
		r = r.WithContext(context.WithValue(r.Context(), "sessionID", fmt.Sprintf("%d", sessionData.ID)))
	}
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusUnauthorized, err, startTime, r.URL.Path, bodySize)
		return
	}

	sess, err := e.sessions.Get(sessionData.ID)
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusForbidden, err, startTime, r.URL.Path, bodySize)
		return
	}

	// Add projectID to context
	r = r.WithContext(context.WithValue(r.Context(), "projectID", fmt.Sprintf("%d", sess.ProjectID)))

	// Get taskID
	vars := mux.Vars(r)
	id := vars["id"]

	// Get task info
	info, err := e.uxTesting.GetInfo(id)
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusInternalServerError, err, startTime, r.URL.Path, bodySize)
		return
	}
	if sess.ProjectID != info.ProjectID {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusForbidden, errors.New("project mismatch"), startTime, r.URL.Path, bodySize)
		return
	}
	type TaskInfoResponse struct {
		Task *uxtesting.UXTestInfo `json:"test"`
	}
	e.responser.ResponseWithJSON(e.log, r.Context(), w, &TaskInfoResponse{Task: info}, startTime, r.URL.Path, bodySize)
}

func (e *handlersImpl) sendUXTestSignal(w http.ResponseWriter, r *http.Request) {
	startTime := time.Now()
	bodySize := 0

	// Check authorization
	sessionData, err := e.tokenizer.ParseFromHTTPRequest(r)
	if sessionData != nil {
		r = r.WithContext(context.WithValue(r.Context(), "sessionID", fmt.Sprintf("%d", sessionData.ID)))
	}
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusUnauthorized, err, startTime, r.URL.Path, bodySize)
		return
	}

	// Add sessionID and projectID to context
	if info, err := e.sessions.Get(sessionData.ID); err == nil {
		r = r.WithContext(context.WithValue(r.Context(), "projectID", fmt.Sprintf("%d", info.ProjectID)))
	}

	bodyBytes, err := api.ReadBody(e.log, w, r, e.jsonSizeLimit)
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusRequestEntityTooLarge, err, startTime, r.URL.Path, bodySize)
		return
	}
	bodySize = len(bodyBytes)

	// Parse request body
	req := &uxtesting.TestSignal{}

	if err := json.Unmarshal(bodyBytes, req); err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusBadRequest, err, startTime, r.URL.Path, bodySize)
		return
	}
	req.SessionID = sessionData.ID

	// Save test signal
	if err := e.uxTesting.SetTestSignal(req); err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusBadRequest, err, startTime, r.URL.Path, bodySize)
		return
	}
	e.responser.ResponseOK(e.log, r.Context(), w, startTime, r.URL.Path, bodySize)
}

func (e *handlersImpl) sendUXTaskSignal(w http.ResponseWriter, r *http.Request) {
	startTime := time.Now()
	bodySize := 0

	// Check authorization
	sessionData, err := e.tokenizer.ParseFromHTTPRequest(r)
	if sessionData != nil {
		r = r.WithContext(context.WithValue(r.Context(), "sessionID", fmt.Sprintf("%d", sessionData.ID)))
	}
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusUnauthorized, err, startTime, r.URL.Path, bodySize)
		return
	}

	// Add sessionID and projectID to context
	if info, err := e.sessions.Get(sessionData.ID); err == nil {
		r = r.WithContext(context.WithValue(r.Context(), "projectID", fmt.Sprintf("%d", info.ProjectID)))
	}

	bodyBytes, err := api.ReadBody(e.log, w, r, e.jsonSizeLimit)
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusRequestEntityTooLarge, err, startTime, r.URL.Path, bodySize)
		return
	}
	bodySize = len(bodyBytes)

	// Parse request body
	req := &uxtesting.TaskSignal{}

	if err := json.Unmarshal(bodyBytes, req); err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusBadRequest, err, startTime, r.URL.Path, bodySize)
		return
	}
	req.SessionID = sessionData.ID

	// Save test signal
	if err := e.uxTesting.SetTaskSignal(req); err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusBadRequest, err, startTime, r.URL.Path, bodySize)
		return
	}
	e.responser.ResponseOK(e.log, r.Context(), w, startTime, r.URL.Path, bodySize)
}

func (e *handlersImpl) getUXUploadUrl(w http.ResponseWriter, r *http.Request) {
	startTime := time.Now()
	bodySize := 0

	// Check authorization
	sessionData, err := e.tokenizer.ParseFromHTTPRequest(r)
	if sessionData != nil {
		r = r.WithContext(context.WithValue(r.Context(), "sessionID", fmt.Sprintf("%d", sessionData.ID)))
	}
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusUnauthorized, err, startTime, r.URL.Path, bodySize)
		return
	}

	// Add sessionID and projectID to context
	if info, err := e.sessions.Get(sessionData.ID); err == nil {
		r = r.WithContext(context.WithValue(r.Context(), "projectID", fmt.Sprintf("%d", info.ProjectID)))
	}

	key := fmt.Sprintf("%d/ux_webcam_record.webm", sessionData.ID)
	url, err := e.objStorage.GetPreSignedUploadUrl(key)
	if err != nil {
		e.responser.ResponseWithError(e.log, r.Context(), w, http.StatusInternalServerError, err, startTime, r.URL.Path, bodySize)
		return
	}
	type UrlResponse struct {
		URL string `json:"url"`
	}
	e.responser.ResponseWithJSON(e.log, r.Context(), w, &UrlResponse{URL: url}, startTime, r.URL.Path, bodySize)
}