package service

import (
	"bufio"
	"cybertron/configs"
	"cybertron/constants"
	"cybertron/models/db"
	"cybertron/models/instrumentation"
	inPodCache "cybertron/pkg/cache"
	"cybertron/pkg/encoder"
	"cybertron/pkg/kafka/producer"
	"cybertron/pkg/log"
	"cybertron/pkg/metrics"
	"cybertron/pkg/utils"
	"encoding/json"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
	"net/http"
)

type ExceptionService struct {
	logger           *log.Logger
	dbClient         *gorm.DB
	kafkaProducer    producer.KProducer
	inPodCacheClient *inPodCache.Cache
	kafkaConfig      configs.KafkaConfig
}

type Frame struct {
	Filename string `json:"filename"`
	Function string `json:"function"`
	InApp    bool   `json:"in_app"`
	Lineno   int    `json:"lineno,omitempty"`
	Colno    int    `json:"colno,omitempty"`
}

type Stacktrace struct {
	Frames []Frame `json:"frames"`
}

type ExceptionValue struct {
	Type        string      `json:"type"`
	Value       string      `json:"value"`
	Stacktrace  Stacktrace  `json:"stacktrace"`
	ProjectId   string      `json:"project_id,omitempty"`
	ReleaseId   string      `json:"release_id,omitempty"`
	Breadcrumbs interface{} `json:"breadcrumbs,omitempty"`
	Extra       interface{} `json:"extra,omitempty"`
	Request     interface{} `json:"request,omitempty"`
	Contexts    interface{} `json:"contexts,omitempty"`
	AwsAccount  string      `json:"aws_account,omitempty"`
}

type Exception struct {
	Values []ExceptionValue `json:"values"`
}
type Payload struct {
	Exception   Exception   `json:"exception"`
	Breadcrumbs interface{} `json:"breadcrumbs"`
	Request     interface{} `json:"request"`
	Extra       interface{} `json:"extra"`
	Contexts    interface{} `json:"contexts"`
}

func isIgnored(value string) bool {
	for _, pattern := range constants.IgnorePatterns {
		if pattern.MatchString(value) {
			return true
		}
	}
	return false
}

func NewExceptionService(logger *log.Logger, dbClient *gorm.DB, kafkaProducer producer.KProducer, cache *inPodCache.Cache, kafkaConfig configs.KafkaConfig) *ExceptionService {
	return &ExceptionService{
		logger:           logger,
		dbClient:         dbClient,
		kafkaProducer:    kafkaProducer,
		inPodCacheClient: cache,
		kafkaConfig:      kafkaConfig,
	}
}

func (exceptionService *ExceptionService) CatchErrors(c *gin.Context) {
	projectID := c.Param("projectId")
	secret := c.Query("sentry_key")

	var secretFromDb, found = exceptionService.inPodCacheClient.Get(projectID)
	var awsAccountFromDb, awsAccountFound = exceptionService.inPodCacheClient.Get(projectID + "_account")

	//validate project id and secret is valid

	if !found || !awsAccountFound {
		var projectData db.Project
		exceptionService.dbClient.First(&projectData, "project_reference_id = ?", projectID)
		secretFromDb = projectData.Secret
		awsAccountFromDb = projectData.Account
		exceptionService.inPodCacheClient.Set(projectID, secretFromDb)
		exceptionService.inPodCacheClient.Set(projectID+"_account", awsAccountFromDb)

	}

	if secret != secretFromDb {
		utils.ErrorResponse(c, "Unable to validate")
		return
	}

	scanner := bufio.NewScanner(c.Request.Body)
	var lines []string

	//error metric firing

	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}

	var jsonData Payload

	//ensure we are processing a valid payload
	if len(lines) <= 2 {
		//exceptionService.logger.Error("payload is not valid", zap.Strings("payload", lines))
		c.JSON(http.StatusOK, gin.H{"status": "payload is not valid"})
		return
	}
	err := json.Unmarshal([]byte(lines[2]), &jsonData)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Second line is not valid JSON"})
		return
	}

	metrics.PublishErrorConsumptionMetric(instrumentation.ErrorConsumptionMetric{ProjectId: projectID})

	for _, errorItem := range jsonData.Exception.Values {
		if isIgnored(errorItem.Value) {
			continue
		}
		errorItem.ProjectId = projectID
		errorItem.Breadcrumbs = jsonData.Breadcrumbs
		errorItem.Extra = jsonData.Extra
		errorItem.Request = jsonData.Request
		errorItem.Contexts = jsonData.Contexts
		errorItem.AwsAccount = awsAccountFromDb.(string)
		err := exceptionService.kafkaProducer.PublishEvent(errorItem, exceptionService.kafkaConfig.Topic, "", nil, encoder.JsonEncoderInstance)

		if err != nil {
			exceptionService.logger.Error("Error publishing exception to Kafka: " + err.Error())
		}
	}

	c.JSON(http.StatusOK, gin.H{"status": "success"})
}