package handler

import (
	"encoding/json"
	"strconv"

	"spider/internal/model"
	"spider/internal/notification"
	"spider/internal/store"

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

// NotificationHandler handles notification config CRUD.
type NotificationHandler struct {
	store   *store.Store
	manager *notification.Manager
}

// List handles GET /notification-configs
func (h *NotificationHandler) List(c *gin.Context) {
	var configs []model.NotificationConfig
	if err := h.store.DB.Order("created_at DESC").Find(&configs).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}
	OK(c, configs)
}

// Create handles POST /notification-configs
func (h *NotificationHandler) Create(c *gin.Context) {
	var body struct {
		Name      string            `json:"name" binding:"required"`
		EventType string            `json:"event_type" binding:"required"`
		Channel   string            `json:"channel" binding:"required"`
		Config    map[string]string `json:"config"`
		Enabled   bool              `json:"enabled"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		Fail(c, 400, err.Error())
		return
	}

	configJSON, _ := json.Marshal(body.Config)
	cfg := model.NotificationConfig{
		Name:      body.Name,
		EventType: body.EventType,
		Channel:   body.Channel,
		Config:    datatypes.JSON(configJSON),
		Enabled:   body.Enabled,
	}

	if err := h.store.DB.Create(&cfg).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}
	LogAudit(h.store, c, "create", "notification", strconv.Itoa(int(cfg.ID)), gin.H{"name": cfg.Name})
	OK(c, cfg)
}

// Update handles PUT /notification-configs/:id
func (h *NotificationHandler) Update(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		Fail(c, 400, "invalid id")
		return
	}

	var existing model.NotificationConfig
	if err := h.store.DB.First(&existing, id).Error; err != nil {
		Fail(c, 404, "not found")
		return
	}

	var body struct {
		Name      *string            `json:"name"`
		EventType *string            `json:"event_type"`
		Channel   *string            `json:"channel"`
		Config    *map[string]string `json:"config"`
		Enabled   *bool              `json:"enabled"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		Fail(c, 400, err.Error())
		return
	}

	updates := map[string]any{}
	if body.Name != nil {
		updates["name"] = *body.Name
	}
	if body.EventType != nil {
		updates["event_type"] = *body.EventType
	}
	if body.Channel != nil {
		updates["channel"] = *body.Channel
	}
	if body.Config != nil {
		configJSON, _ := json.Marshal(*body.Config)
		updates["config"] = datatypes.JSON(configJSON)
	}
	if body.Enabled != nil {
		updates["enabled"] = *body.Enabled
	}

	h.store.DB.Model(&existing).Updates(updates)
	h.store.DB.First(&existing, id)
	OK(c, existing)
}

// Delete handles DELETE /notification-configs/:id
func (h *NotificationHandler) Delete(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		Fail(c, 400, "invalid id")
		return
	}
	if err := h.store.DB.Delete(&model.NotificationConfig{}, id).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}
	OK(c, gin.H{"message": "已删除"})
}

// Test handles POST /notification-configs/:id/test
func (h *NotificationHandler) Test(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		Fail(c, 400, "invalid id")
		return
	}
	var cfg model.NotificationConfig
	if err := h.store.DB.First(&cfg, id).Error; err != nil {
		Fail(c, 404, "not found")
		return
	}
	if err := h.manager.SendTest(cfg); err != nil {
		Fail(c, 500, err.Error())
		return
	}
	OK(c, gin.H{"message": "测试通知已发送"})
}