package handler

import (
	"errors"
	"io"
	"net/http"

	"aiaa-notification-service/internal/model"
	"aiaa-notification-service/internal/notify"
	"aiaa-notification-service/internal/parser"

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

type NotifyHandler struct {
	svc *notify.Service
}

func NewNotifyHandler(svc *notify.Service) *NotifyHandler {
	return &NotifyHandler{svc: svc}
}

func (h *NotifyHandler) Handle(c *gin.Context) {
	src := c.MustGet("source").(*model.Source)

	body, err := io.ReadAll(c.Request.Body)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "read body failed"})
		return
	}

	p, err := parser.NewParser(src.ParseMode, src.ParsePattern)
	if err != nil {
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": "parser setup: " + err.Error()})
		return
	}
	msg, err := p.Parse(body)
	if err != nil {
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": "parse failed: " + err.Error()})
		return
	}

	res, err := h.svc.Process(c.Request.Context(), notify.Request{
		Source: src, Event: msg.Event, Data: msg.Data,
	})
	if err != nil {
		if errors.Is(err, notify.ErrUnprocessable) {
			c.JSON(http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	if !res.Matched {
		c.JSON(http.StatusOK, gin.H{"matched": false})
		return
	}
	if res.Filtered {
		c.JSON(http.StatusOK, gin.H{"matched": true, "filtered": true, "reason": res.Reason})
		return
	}
	c.JSON(http.StatusOK, gin.H{"matched": true, "channels": res.Channels, "accepted": true})
}