package controller

import (
	"net/http"
	"strconv"

	"ezops/model"

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

// CreateRole 创建角色 // Logan.Li
// POST /api/v1/admin/roles
func (h *UserHandler) CreateRole(c *gin.Context) {
	var req model.CreateRoleRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Response{
			Code:    400,
			Message: "请求参数错误: " + err.Error(),
		})
		return
	}

	// 名称 / 编码唯一性校验
	var existing model.Role
	if err := h.db.Where("name = ? OR code = ?", req.Name, req.Code).First(&existing).Error; err == nil {
		c.JSON(http.StatusBadRequest, model.Response{
			Code:    400,
			Message: "角色名称或编码已存在",
		})
		return
	}

	role := model.Role{
		Name:        req.Name,
		Code:        req.Code,
		Description: req.Description,
		Status:      1,
	}
	if err := h.db.Create(&role).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{
			Code:    500,
			Message: "创建角色失败",
		})
		return
	}

	// 关联权限
	if len(req.PermissionIDs) > 0 {
		var perms []model.Permission
		h.db.Find(&perms, req.PermissionIDs)
		h.db.Model(&role).Association("Permissions").Append(perms)
	}

	h.db.Preload("Permissions").First(&role, role.ID)
	c.JSON(http.StatusOK, model.Response{
		Code:    200,
		Message: "创建成功",
		Data:    role,
	})
}

// UpdateRole 更新角色 // Logan.Li
// PUT /api/v1/admin/roles/:id
func (h *UserHandler) UpdateRole(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "无效的角色 ID"})
		return
	}

	var req model.UpdateRoleRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Response{
			Code:    400,
			Message: "请求参数错误: " + err.Error(),
		})
		return
	}

	var role model.Role
	if err := h.db.First(&role, id).Error; err != nil {
		c.JSON(http.StatusNotFound, model.Response{Code: 404, Message: "角色不存在"})
		return
	}

	updates := map[string]interface{}{}
	if req.Name != "" {
		// 名称 / 编码唯一性校验（排除自身）
		var dup model.Role
		if err := h.db.Where("(name = ? OR code = ?) AND id != ?", req.Name, req.Code, id).First(&dup).Error; err == nil {
			c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "角色名称或编码已存在"})
			return
		}
		updates["name"] = req.Name
	}
	if req.Code != "" {
		updates["code"] = req.Code
	}
	if req.Description != nil {
		updates["description"] = *req.Description
	}
	if req.Status != nil {
		updates["status"] = *req.Status
	}

	if len(updates) > 0 {
		if err := h.db.Model(&role).Updates(updates).Error; err != nil {
			c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "更新失败"})
			return
		}
	}

	// 替换权限关联
	if req.PermissionIDs != nil {
		var perms []model.Permission
		if len(req.PermissionIDs) > 0 {
			h.db.Find(&perms, req.PermissionIDs)
		}
		h.db.Model(&role).Association("Permissions").Replace(perms)
	}

	h.db.Preload("Permissions").First(&role, id)
	c.JSON(http.StatusOK, model.Response{
		Code:    200,
		Message: "更新成功",
		Data:    role,
	})
}

// DeleteRole 删除角色 // Logan.Li
// DELETE /api/v1/admin/roles/:id
func (h *UserHandler) DeleteRole(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "无效的角色 ID"})
		return
	}

	var role model.Role
	if err := h.db.First(&role, id).Error; err != nil {
		c.JSON(http.StatusNotFound, model.Response{Code: 404, Message: "角色不存在"})
		return
	}

	// 清空权限关联后再删除（避免 join 表残留）
	h.db.Model(&role).Association("Permissions").Clear()
	if err := h.db.Delete(&role).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "删除失败"})
		return
	}

	c.JSON(http.StatusOK, model.Response{
		Code:    200,
		Message: "删除成功",
	})
}

// ListPermissions 获取权限列表（供前端角色权限选择） // Logan.Li
// GET /api/v1/admin/permissions
func (h *UserHandler) ListPermissions(c *gin.Context) {
	var perms []model.Permission
	h.db.Where("status = ?", 1).Order("sort ASC, id ASC").Find(&perms)
	c.JSON(http.StatusOK, model.Response{
		Code: 200,
		Data: model.ListResponse{List: perms, Total: int64(len(perms))},
	})
}