/*
Copyright 2025 linux.do

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package system_config

import (
	"errors"
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/linux-do/credit/internal/db"
	"github.com/linux-do/credit/internal/model"
	"github.com/linux-do/credit/internal/util"
	"gorm.io/gorm"
)

// CreateSystemConfigRequest 创建系统配置请求
type CreateSystemConfigRequest struct {
	Key         string `json:"key" binding:"required,max=64"`
	Value       string `json:"value" binding:"required,max=255"`
	Description string `json:"description" binding:"max=255"`
}

// UpdateSystemConfigRequest 更新系统配置请求
type UpdateSystemConfigRequest struct {
	Value       string `json:"value" binding:"required,max=255"`
	Description string `json:"description" binding:"max=255"`
}

// CreateSystemConfig 创建系统配置
// @Tags admin
// @Accept json
// @Produce json
// @Param request body CreateSystemConfigRequest true "request body"
// @Success 200 {object} util.ResponseAny
// @Router /api/v1/admin/system-configs [post]
func CreateSystemConfig(c *gin.Context) {
	var req CreateSystemConfigRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, util.Err(err.Error()))
		return
	}

	// 检查配置键是否已存在
	var existing model.SystemConfig
	if err := db.DB(c.Request.Context()).Where("key = ?", req.Key).First(&existing).Error; err == nil {
		c.JSON(http.StatusBadRequest, util.Err(ConfigKeyExists))
		return
	} else if !errors.Is(err, gorm.ErrRecordNotFound) {
		c.JSON(http.StatusInternalServerError, util.Err(err.Error()))
		return
	}

	config := model.SystemConfig{
		Key:         req.Key,
		Value:       req.Value,
		Description: req.Description,
	}

	if err := db.DB(c.Request.Context()).Transaction(func(tx *gorm.DB) error {
		// 创建配置
		if err := tx.Create(&config).Error; err != nil {
			return err
		}

		if err := db.HSetJSON(c.Request.Context(), model.SystemConfigRedisHashKey, req.Key, &config); err != nil {
			return err
		}

		return nil
	}); err != nil {
		c.JSON(http.StatusInternalServerError, util.Err(err.Error()))
		return
	}

	c.JSON(http.StatusOK, util.OKNil())
}

// ListSystemConfigs 获取系统配置列表
// @Tags admin
// @Produce json
// @Success 200 {object} util.ResponseAny
// @Router /api/v1/admin/system-configs [get]
func ListSystemConfigs(c *gin.Context) {
	var configs []model.SystemConfig
	if err := db.DB(c.Request.Context()).
		Order("created_at DESC").
		Find(&configs).Error; err != nil {
		c.JSON(http.StatusInternalServerError, util.Err(err.Error()))
		return
	}

	c.JSON(http.StatusOK, util.OK(configs))
}

// GetSystemConfig 获取单个系统配置
// @Tags admin
// @Produce json
// @Param key path string true "配置键"
// @Success 200 {object} util.ResponseAny
// @Router /api/v1/admin/system-configs/{key} [get]
func GetSystemConfig(c *gin.Context) {
	var config model.SystemConfig
	if err := db.DB(c.Request.Context()).Where("key = ?", c.Param("key")).First(&config).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusNotFound, util.Err(SystemConfigNotFound))
		} else {
			c.JSON(http.StatusInternalServerError, util.Err(err.Error()))
		}
		return
	}

	c.JSON(http.StatusOK, util.OK(config))
}

// UpdateSystemConfig 更新系统配置
// @Tags admin
// @Accept json
// @Produce json
// @Param key path string true "配置键"
// @Param request body UpdateSystemConfigRequest true "request body"
// @Success 200 {object} util.ResponseAny
// @Router /api/v1/admin/system-configs/{key} [put]
func UpdateSystemConfig(c *gin.Context) {
	var req UpdateSystemConfigRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, util.Err(err.Error()))
		return
	}

	key := c.Param("key")

	// 检查配置是否存在
	var config model.SystemConfig
	if err := db.DB(c.Request.Context()).Where("key = ?", key).First(&config).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusNotFound, util.Err(SystemConfigNotFound))
		} else {
			c.JSON(http.StatusInternalServerError, util.Err(err.Error()))
		}
		return
	}

	if err := db.DB(c.Request.Context()).Transaction(func(tx *gorm.DB) error {
		// 更新配置
		if err := tx.Model(&config).
			Updates(map[string]interface{}{
				"value":       req.Value,
				"description": req.Description,
			}).Error; err != nil {
			return err
		}

		if err := db.HSetJSON(c.Request.Context(), model.SystemConfigRedisHashKey, key, &config); err != nil {
			return err
		}

		return nil
	}); err != nil {
		c.JSON(http.StatusInternalServerError, util.Err(err.Error()))
		return
	}

	c.JSON(http.StatusOK, util.OKNil())
}

// DeleteSystemConfig 删除系统配置
// @Tags admin
// @Produce json
// @Param key path string true "配置键"
// @Success 200 {object} util.ResponseAny
// @Router /api/v1/admin/system-configs/{key} [delete]
func DeleteSystemConfig(c *gin.Context) {
	key := c.Param("key")

	// 检查配置是否存在
	var config model.SystemConfig
	if err := db.DB(c.Request.Context()).Where("key = ?", key).First(&config).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusNotFound, util.Err(SystemConfigNotFound))
		} else {
			c.JSON(http.StatusInternalServerError, util.Err(err.Error()))
		}
		return
	}

	if err := db.DB(c.Request.Context()).Transaction(func(tx *gorm.DB) error {
		// 删除配置
		if err := tx.Delete(&config).Error; err != nil {
			return err
		}

		if err := db.Redis.HDel(c.Request.Context(), db.PrefixedKey(model.SystemConfigRedisHashKey), key).Err(); err != nil {
			return err
		}

		return nil
	}); err != nil {
		c.JSON(http.StatusInternalServerError, util.Err(err.Error()))
		return
	}

	c.JSON(http.StatusOK, util.OKNil())
}