package server

import (
	"errors"
	"net/http"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"

	"code.littlelan.cn/CarrotAssistant/backend/internal/security"
	"code.littlelan.cn/CarrotAssistant/backend/internal/store"
)

type loginReq struct {
	Username string `json:"username" binding:"required"`
	Password string `json:"password" binding:"required"`
}

// POST /admin/login — authenticates an admin and returns a JWT.
func (d Deps) handleLogin(c *gin.Context) {
	var req loginReq
	if !bind(c, &req) {
		return
	}
	var u store.AdminUser
	err := d.DB.Where("username = ?", req.Username).First(&u).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "用户名或密码错误"})
		return
	}
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "查询失败"})
		return
	}
	if !security.VerifyPassword(u.PasswordHash, req.Password) {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "用户名或密码错误"})
		return
	}
	token, err := d.issueToken(u.Username)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "签发令牌失败"})
		return
	}
	d.auditBy(u.Username, nil, nil, "admin.login", nil)
	c.JSON(http.StatusOK, gin.H{"token": token, "username": u.Username})
}

// GET /admin/me — returns the currently authenticated admin (for the SPA to
// confirm a stored token is still valid after reload).
func (d Deps) handleMe(c *gin.Context) {
	u := adminCtx(c)
	c.JSON(http.StatusOK, gin.H{"id": u.ID, "username": u.Username})
}