package http

import (
	"chatapp3-golang/internal/config"
	"chatapp3-golang/internal/integration"
	"chatapp3-golang/internal/repo"
	"chatapp3-golang/internal/service"
	"context"
	"errors"
	"net/http"
	"strings"
	"time"

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

const authUserContextKey = "auth_user"

func NewRouter(
	cfg config.Config,
	repository *repo.Repository,
	javaClient *integration.Client,
	inviteService *service.InviteService,
	baishunService *service.BaishunService,
) *gin.Engine {
	router := gin.New()
	router.Use(gin.Logger(), gin.Recovery())

	router.GET("/health", func(c *gin.Context) {
		ctx, cancel := context.WithTimeout(c.Request.Context(), cfg.Timeout)
		defer cancel()
		if err := repository.Ping(ctx); err != nil {
			c.JSON(http.StatusServiceUnavailable, gin.H{
				"code":    "dependency_unavailable",
				"message": err.Error(),
			})
			return
		}
		c.JSON(http.StatusOK, gin.H{"code": "ok", "message": "success"})
	})

	router.GET("/public/h5/invite-campaign/landing", func(c *gin.Context) {
		resp, err := inviteService.GetLanding(c.Request.Context(), c.Query("code"))
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, resp)
	})

	internal := router.Group("/internal/invite-campaign")
	internal.POST("/recharge-success", func(c *gin.Context) {
		var req service.RechargeSuccessRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			writeError(c, service.NewAppError(http.StatusBadRequest, "bad_request", err.Error()))
			return
		}
		resp, err := inviteService.HandleRechargeSuccess(c.Request.Context(), req)
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, resp)
	})

	authenticated := router.Group("/app/h5/invite-campaign")
	authenticated.Use(authMiddleware(javaClient))
	authenticated.GET("/home", func(c *gin.Context) {
		user := mustAuthUser(c)
		resp, err := inviteService.GetHome(c.Request.Context(), user)
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, resp)
	})
	authenticated.POST("/bind-code", func(c *gin.Context) {
		user := mustAuthUser(c)
		var req service.BindCodeRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			writeError(c, service.NewAppError(http.StatusBadRequest, "bad_request", err.Error()))
			return
		}
		resp, err := inviteService.BindCode(c.Request.Context(), user, resolveClientIP(c), req)
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, resp)
	})
	authenticated.POST("/tasks/claim", func(c *gin.Context) {
		user := mustAuthUser(c)
		var req service.TaskClaimRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			writeError(c, service.NewAppError(http.StatusBadRequest, "bad_request", err.Error()))
			return
		}
		resp, err := inviteService.ClaimTask(c.Request.Context(), user, req)
		if err != nil {
			writeError(c, err)
			return
		}
		writeOK(c, resp)
	})

	registerBaishunRoutes(router, cfg, javaClient, baishunService)

	return router
}

func authMiddleware(javaClient *integration.Client) gin.HandlerFunc {
	return func(c *gin.Context) {
		authorization := strings.TrimSpace(c.GetHeader("Authorization"))
		if authorization == "" {
			writeError(c, service.NewAppError(http.StatusUnauthorized, "missing_authorization", "authorization is required"))
			c.Abort()
			return
		}
		token := trimBearer(authorization)
		ctx, cancel := context.WithTimeout(c.Request.Context(), 10*time.Second)
		defer cancel()
		credential, err := javaClient.AuthenticateToken(ctx, token)
		if err != nil {
			writeError(c, service.NewAppError(http.StatusUnauthorized, "invalid_token", err.Error()))
			c.Abort()
			return
		}
		c.Set(authUserContextKey, service.AuthUser{
			UserID:        int64(credential.UserID),
			SysOrigin:     credential.SysOrigin,
			Token:         token,
			Authorization: authorization,
		})
		c.Next()
	}
}

func mustAuthUser(c *gin.Context) service.AuthUser {
	value, exists := c.Get(authUserContextKey)
	if !exists {
		return service.AuthUser{}
	}
	user, _ := value.(service.AuthUser)
	return user
}

func writeOK(c *gin.Context, data any) {
	c.JSON(http.StatusOK, gin.H{
		"status":   true,
		"errorCode": 0,
		"errorMsg": "success",
		"body":     data,
		"code":    "success",
		"message": "success",
		"data":    data,
		"time":    time.Now().UnixMilli(),
	})
}

func writeError(c *gin.Context, err error) {
	var appErr *service.AppError
	if errors.As(err, &appErr) {
		c.JSON(appErr.Status, gin.H{
			"status":        false,
			"errorCode":     appErr.Status,
			"errorCodeName": appErr.Code,
			"errorMsg":      appErr.Message,
			"body":          nil,
			"code":    appErr.Code,
			"message": appErr.Message,
			"data":    nil,
			"time":    time.Now().UnixMilli(),
		})
		return
	}
	c.JSON(http.StatusInternalServerError, gin.H{
		"status":        false,
		"errorCode":     http.StatusInternalServerError,
		"errorCodeName": "internal_error",
		"errorMsg":      err.Error(),
		"body":          nil,
		"code":    "internal_error",
		"message": err.Error(),
		"data":    nil,
		"time":    time.Now().UnixMilli(),
	})
}

func trimBearer(authorization string) string {
	if strings.HasPrefix(strings.ToLower(authorization), "bearer ") {
		return strings.TrimSpace(authorization[7:])
	}
	return authorization
}

func resolveClientIP(c *gin.Context) string {
	if forwarded := strings.TrimSpace(c.GetHeader("X-Forwarded-For")); forwarded != "" {
		parts := strings.Split(forwarded, ",")
		if len(parts) > 0 {
			return strings.TrimSpace(parts[0])
		}
	}
	return strings.TrimSpace(c.ClientIP())
}