package service

import (
	"fmt"
	"time"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/constant"
	"github.com/QuantumNous/new-api/logger"
	"github.com/QuantumNous/new-api/model"
	relaycommon "github.com/QuantumNous/new-api/relay/common"
	"github.com/QuantumNous/new-api/relaykit/types"
	"github.com/QuantumNous/new-api/setting/operation_setting"

	"github.com/bytedance/gopkg/util/gopool"
	"github.com/gin-gonic/gin"
)

// DecideRelayRetry is the single retry decision for relay attempts. The reason
// is recorded in the request policy decision events of the log details.
func DecideRelayRetry(c *gin.Context, err *types.NewAPIError, retryTimes int) PolicyDecision {
	if err == nil {
		return PolicyDecision{Action: "stop", Reason: "request_completed", Source: "system"}
	}
	if c.Request != nil && c.Request.Context().Err() != nil {
		return PolicyDecision{Action: "stop", Reason: "client_cancelled", Source: "system"}
	}
	if c.Writer != nil && c.Writer.Written() {
		return PolicyDecision{Action: "stop", Reason: "response_started", Source: "system"}
	}
	if ShouldSkipRetryAfterChannelAffinityFailure(c) && !IsPoolFailoverError(c, err) {
		source := RequestPolicy(c).SessionModeSource
		if source == "" {
			source = "session_rule"
		}
		return PolicyDecision{Action: "stop", Reason: "strict_session", Source: source}
	}
	if GetChannelConstraints(c).SuppressesRetry() {
		return PolicyDecision{Action: "stop", Reason: "pinned_channel", Source: "channel_constraint"}
	}
	if types.IsChannelError(err) {
		return PolicyDecision{Action: "retry", Reason: "channel_error", Source: "system"}
	}
	if types.IsSkipRetryError(err) {
		return PolicyDecision{Action: "stop", Reason: "non_retryable_error", Source: "system"}
	}
	if retryTimes <= 0 {
		return PolicyDecision{Action: "stop", Reason: "attempt_budget_exhausted", Source: "global"}
	}
	code := err.StatusCode
	if code >= 200 && code < 300 {
		return PolicyDecision{Action: "stop", Reason: "system_retry_exclusion", Source: "system"}
	}
	if code < 100 || code > 599 {
		return PolicyDecision{Action: "retry", Reason: "unrecognized_status", Source: "system"}
	}
	if operation_setting.IsAlwaysSkipRetryCode(err.GetErrorCode()) || operation_setting.IsAlwaysSkipRetryStatusCode(code) {
		return PolicyDecision{Action: "stop", Reason: "system_retry_exclusion", Source: "system"}
	}
	if operation_setting.ShouldRetryByStatusCode(code) {
		return PolicyDecision{Action: "retry", Reason: "retry_status_matched", Source: "global"}
	}
	return PolicyDecision{Action: "stop", Reason: "status_not_retryable", Source: "global"}
}

func ShouldRetryRelayError(c *gin.Context, openaiErr *types.NewAPIError, retryTimes int) bool {
	return DecideRelayRetry(c, openaiErr, retryTimes).Action == "retry"
}

func ProcessChannelError(c *gin.Context, channelError types.ChannelError, err *types.NewAPIError, relayInfo *relaycommon.RelayInfo) {
	if err == nil {
		return
	}
	logger.LogError(c, fmt.Sprintf("channel error (channel #%d, status code: %d): %s", channelError.ChannelId, err.StatusCode, common.LocalLogPreview(err.MaskSensitiveErrorWithStatusCode())))
	if err.GetErrorCode() != relaycommon.ResponseGuardErrorCode && ShouldDisableChannel(err) && channelError.AutoBan {
		reason := err.MaskSensitiveErrorWithStatusCode()
		gopool.Go(func() {
			DisableChannel(channelError, reason)
		})
	}

	if constant.ErrorLogEnabled && types.IsRecordErrorLog(err) {
		userId := c.GetInt("id")
		tokenName := c.GetString("token_name")
		modelName := c.GetString("original_model")
		tokenId := c.GetInt("token_id")
		usingGroup := relayErrorGroup(c, channelError.ChannelId, relayInfo)
		other := model.NewLogOther()
		if c.Request != nil && c.Request.URL != nil {
			other.SetPublic("request_path", c.Request.URL.Path)
		}
		other.SetPublic("error_type", err.GetErrorType())
		other.SetPublic("error_code", err.GetErrorCode())
		other.SetPublic("status_code", err.StatusCode)
		AppendRelayLogAdminInfo(c, relayInfo, other)
		AppendResponseModelLogInfo(relayInfo, other)
		AppendTaskPluginContextAuditInfo(c, other)
		startTime := common.GetContextKeyTime(c, constant.ContextKeyRequestStartTime)
		if startTime.IsZero() {
			startTime = time.Now()
		}
		useTimeSeconds := int(time.Since(startTime).Seconds())
		other.SetRoot("upstream_error", err.MaskSensitiveErrorWithStatusCode())
		content := fmt.Sprintf("status_code=%d, The model service is temporarily unavailable. Please try again later.", err.StatusCode)
		model.RecordErrorLog(c, userId, channelError.ChannelId, modelName, tokenName, content, tokenId, useTimeSeconds, common.GetContextKeyBool(c, constant.ContextKeyIsStream), usingGroup, other)
	}
}

// A user/token's default group is not necessarily the selected retry group.
func relayErrorGroup(c *gin.Context, channelID int, info *relaycommon.RelayInfo) string {
	if channelID <= 0 {
		return ""
	}
	if info != nil && info.UsingGroup != "" && info.UsingGroup != "auto" {
		return info.UsingGroup
	}
	if group := common.GetContextKeyString(c, constant.ContextKeyAutoGroup); group != "" {
		return group
	}
	if group := RequestPolicy(c).SelectedGroup; group != "" {
		return group
	}
	group := common.GetContextKeyString(c, constant.ContextKeyUsingGroup)
	if group == "auto" {
		return ""
	}
	return group
}