package controller

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"
	"strings"
	"time"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/constant"
	"github.com/QuantumNous/new-api/model"
	"github.com/QuantumNous/new-api/relay/channel/codex"
	"github.com/QuantumNous/new-api/service"

	"github.com/gin-gonic/gin"
)

func GetCodexChannelUsage(c *gin.Context) {
	channelId, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		common.ApiError(c, fmt.Errorf("invalid channel id: %w", err))
		return
	}

	ch, err := model.GetChannelById(channelId, true)
	if err != nil {
		common.ApiError(c, err)
		return
	}
	if ch == nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "channel not found"})
		return
	}
	if ch.Type != constant.ChannelTypeCodex {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "channel type is not Codex"})
		return
	}
	if ch.ChannelInfo.IsMultiKey {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "multi-key channel is not supported"})
		return
	}

	oauthKey, err := codex.ParseOAuthKey(strings.TrimSpace(ch.Key))
	if err != nil {
		common.SysError("failed to parse oauth key: " + err.Error())
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "解析凭证失败，请检查渠道配置"})
		return
	}
	accessToken := strings.TrimSpace(oauthKey.AccessToken)
	accountID := strings.TrimSpace(oauthKey.AccountID)
	if accessToken == "" {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "codex channel: access_token is required"})
		return
	}
	if accountID == "" {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "codex channel: account_id is required"})
		return
	}

	client, err := service.NewProxyHttpClient(ch.GetSetting().Proxy)
	if err != nil {
		common.ApiError(c, err)
		return
	}

	ctx, cancel := context.WithTimeout(c.Request.Context(), 15*time.Second)
	defer cancel()

	statusCode, body, err := service.FetchCodexWhamUsage(ctx, client, ch.GetBaseURL(), accessToken, accountID)
	if err != nil {
		common.SysError("failed to fetch codex usage: " + err.Error())
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "获取用量信息失败，请稍后重试"})
		return
	}

	if (statusCode == http.StatusUnauthorized || statusCode == http.StatusForbidden) && strings.TrimSpace(oauthKey.RefreshToken) != "" {
		refreshCtx, refreshCancel := context.WithTimeout(c.Request.Context(), 10*time.Second)
		defer refreshCancel()

		res, refreshErr := service.RefreshCodexOAuthToken(refreshCtx, oauthKey.RefreshToken)
		if refreshErr == nil {
			oauthKey.AccessToken = res.AccessToken
			oauthKey.RefreshToken = res.RefreshToken
			oauthKey.LastRefresh = time.Now().Format(time.RFC3339)
			oauthKey.Expired = res.ExpiresAt.Format(time.RFC3339)
			if strings.TrimSpace(oauthKey.Type) == "" {
				oauthKey.Type = "codex"
			}

			encoded, encErr := common.Marshal(oauthKey)
			if encErr == nil {
				_ = model.DB.Model(&model.Channel{}).Where("id = ?", ch.Id).Update("key", string(encoded)).Error
				model.InitChannelCache()
				service.ResetProxyClientCache()
			}

			ctx2, cancel2 := context.WithTimeout(c.Request.Context(), 15*time.Second)
			defer cancel2()
			statusCode, body, err = service.FetchCodexWhamUsage(ctx2, client, ch.GetBaseURL(), oauthKey.AccessToken, accountID)
			if err != nil {
				common.SysError("failed to fetch codex usage after refresh: " + err.Error())
				c.JSON(http.StatusOK, gin.H{"success": false, "message": "获取用量信息失败，请稍后重试"})
				return
			}
		}
	}

	var payload any
	if json.Unmarshal(body, &payload) != nil {
		payload = string(body)
	}

	ok := statusCode >= 200 && statusCode < 300
	resp := gin.H{
		"success":         ok,
		"message":         "",
		"upstream_status": statusCode,
		"data":            payload,
	}
	if !ok {
		resp["message"] = fmt.Sprintf("upstream status: %d", statusCode)
	}
	c.JSON(http.StatusOK, resp)
}
