package handler

import (
	"net/http"

	"spider/internal/model"

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

// ConfigHandler handles managed settings.
type ConfigHandler struct {
	db *gorm.DB
}

// ListSettings returns all settings.
// GET /config/settings
func (h *ConfigHandler) ListSettings(c *gin.Context) {
	var settings []model.ManagedSetting
	if err := h.db.Order("key_name ASC").Find(&settings).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}
	OK(c, settings)
}

// UpdateSetting updates a setting by key and records an audit revision.
// PUT /config/settings/:key
func (h *ConfigHandler) UpdateSetting(c *gin.Context) {
	key := c.Param("key")
	if key == "" {
		Fail(c, http.StatusBadRequest, "key is required")
		return
	}

	var body struct {
		Value       string `json:"value" binding:"required"`
		Description string `json:"description"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		Fail(c, http.StatusBadRequest, err.Error())
		return
	}

	var setting model.ManagedSetting
	if err := h.db.Where("key_name = ?", key).First(&setting).Error; err != nil {
		Fail(c, 404, "setting not found")
		return
	}

	oldValue := setting.Value

	updates := map[string]interface{}{
		"value": body.Value,
	}
	if body.Description != "" {
		updates["description"] = body.Description
	}

	if err := h.db.Model(&setting).Updates(updates).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}

	// Record audit revision.
	revision := model.ConfigRevision{
		SettingKey: key,
		OldValue:   oldValue,
		NewValue:   body.Value,
		ChangedBy:  "admin",
	}
	h.db.Create(&revision)

	h.db.Where("key_name = ?", key).First(&setting)
	OK(c, setting)
}