package handler

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"

	"github.com/yuxingu/digital-psychology/apps/api/internal/middleware"
	"github.com/yuxingu/digital-psychology/apps/api/internal/service/auth"
	"github.com/yuxingu/digital-psychology/apps/api/pkg/response"
)

// AuthHandler serves /api/v1/auth/*.
type AuthHandler struct {
	Svc *auth.Service
}

// Register mounts auth routes. Public register/login; me/logout need device (+ session).
func (h *AuthHandler) Register(api *gin.RouterGroup) {
	g := api.Group("/auth")
	g.POST("/register", h.RegisterAccount)
	g.POST("/login", h.Login)
	g.POST("/logout", h.Logout)
	g.GET("/me", h.Me)
	g.PATCH("/me", h.PatchMe)
	g.POST("/me/avatar", h.UploadAvatar)
}

type authBody struct {
	Phone    string `json:"phone"`
	Password string `json:"password"`
	Nickname string `json:"nickname"`
}

// RegisterAccount handles POST /auth/register (DeviceAuth required on group).
func (h *AuthHandler) RegisterAccount(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	var body authBody
	if err := c.ShouldBindJSON(&body); err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid request")
		return
	}
	deviceKey := c.GetHeader(middleware.DeviceKeyHeader)
	res, err := h.Svc.Register(c.Request.Context(), userID, deviceKey, body.Phone, body.Password, body.Nickname)
	if err != nil {
		if failTextCompliance(c, err) {
			return
		}
		response.Fail(c, http.StatusBadRequest, 40110, err.Error())
		return
	}
	response.OK(c, res)
}

// Login handles POST /auth/login (open mode: any phone+password).
func (h *AuthHandler) Login(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	var body authBody
	if err := c.ShouldBindJSON(&body); err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid request")
		return
	}
	deviceKey := c.GetHeader(middleware.DeviceKeyHeader)
	res, err := h.Svc.Login(c.Request.Context(), userID, deviceKey, body.Phone, body.Password)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 40111, err.Error())
		return
	}
	c.Set(string(middleware.UserIDKey), res.User.ID)
	response.OK(c, res)
}

// Logout handles POST /auth/logout.
func (h *AuthHandler) Logout(c *gin.Context) {
	tok := bearerToken(c)
	deviceKey := c.GetHeader(middleware.DeviceKeyHeader)
	_ = h.Svc.Logout(c.Request.Context(), tok, deviceKey)
	response.OK(c, gin.H{"ok": true})
}

// Me handles GET /auth/me.
func (h *AuthHandler) Me(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	me, err := h.Svc.Me(c.Request.Context(), userID)
	if err != nil {
		response.Fail(c, http.StatusUnauthorized, 40112, "请先登录")
		return
	}
	response.OK(c, me)
}

type patchMeBody struct {
	Nickname string `json:"nickname"`
}

// PatchMe handles PATCH /auth/me (update nickname).
func (h *AuthHandler) PatchMe(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	var body patchMeBody
	if err := c.ShouldBindJSON(&body); err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid request")
		return
	}
	me, err := h.Svc.UpdateNickname(c.Request.Context(), userID, body.Nickname)
	if err != nil {
		if failTextCompliance(c, err) {
			return
		}
		response.Fail(c, http.StatusBadRequest, 40113, err.Error())
		return
	}
	response.OK(c, me)
}

// UploadAvatar handles POST /auth/me/avatar (multipart file).
func (h *AuthHandler) UploadAvatar(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	fh, err := c.FormFile("file")
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "请选择图片")
		return
	}
	me, err := h.Svc.UpdateAvatar(c.Request.Context(), userID, fh)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 40114, err.Error())
		return
	}
	response.OK(c, me)
}

func bearerToken(c *gin.Context) string {
	h := c.GetHeader("Authorization")
	if strings.HasPrefix(strings.ToLower(h), "bearer ") {
		return strings.TrimSpace(h[7:])
	}
	return ""
}