package handler

import (
	"net/http"
	"strconv"

	"aiaa-notification-service/internal/cache"
	"aiaa-notification-service/internal/model"
	"aiaa-notification-service/internal/store"

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

type TemplateHandler struct {
	store *store.Store
	cache *cache.Cache
}

func NewTemplateHandler(s *store.Store, c *cache.Cache) *TemplateHandler {
	return &TemplateHandler{store: s, cache: c}
}

type createTemplateReq struct {
	Name    string `json:"name"    binding:"required"`
	Content string `json:"content" binding:"required"`
}

func (h *TemplateHandler) Create(c *gin.Context) {
	var req createTemplateReq
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	tmpl := &model.Template{Name: req.Name, Content: req.Content}
	if err := h.store.CreateTemplate(c.Request.Context(), tmpl); err != nil {
		c.JSON(http.StatusConflict, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusCreated, tmpl)
}

func (h *TemplateHandler) List(c *gin.Context) {
	var page store.PageFilter
	if err := c.ShouldBindQuery(&page); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	page.Normalize()

	templates, total, err := h.store.ListTemplates(c.Request.Context(), page)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": templates, "total": total, "page": page.Page})
}

func (h *TemplateHandler) Get(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	tmpl, err := h.store.GetTemplate(c.Request.Context(), id)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "template not found"})
		return
	}
	c.JSON(http.StatusOK, tmpl)
}

func (h *TemplateHandler) Update(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	var req createTemplateReq
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	tmpl := &model.Template{Name: req.Name, Content: req.Content}
	if err := h.store.UpdateTemplate(c.Request.Context(), id, tmpl); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	if h.cache != nil {
		_ = h.cache.InvalidateByTemplate(c.Request.Context(), id)
	}

	c.JSON(http.StatusOK, gin.H{"ok": true})
}

func (h *TemplateHandler) Delete(c *gin.Context) {
	id, _ := strconv.Atoi(c.Param("id"))
	if err := h.store.DeleteTemplate(c.Request.Context(), id); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"ok": true})
}