package handlers

import (
	"net/http"

	"github.com/go-chi/chi"
	"github.com/google/uuid"
	"sneak.berlin/go/webhooker/internal/database"
)

// HandleEntrypointCreate handles adding a new entrypoint.
func (h *Handlers) HandleEntrypointCreate() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		userID, ok := h.getUserID(r)
		if !ok {
			http.Redirect(
				w, r, "/pages/login", http.StatusSeeOther,
			)

			return
		}

		sourceID := chi.URLParam(r, "sourceID")

		var webhook database.Webhook

		err := h.db.DB().Where(
			"id = ? AND user_id = ?", sourceID, userID,
		).First(&webhook).Error
		if err != nil {
			h.renderError(w, r, http.StatusNotFound)

			return
		}

		// The body size cap is enforced by the MaxBodySize
		// middleware, which runs before CSRF parses the form.
		err = r.ParseForm()
		if err != nil {
			h.renderError(w, r, http.StatusBadRequest)

			return
		}

		description := r.PostFormValue("description")

		entrypoint := &database.Entrypoint{
			WebhookID:   webhook.ID,
			Path:        uuid.New().String(),
			Description: description,
			Active:      true,
		}

		err = h.db.DB().Create(entrypoint).Error
		if err != nil {
			h.serverError(w, r, "failed to create entrypoint", err)

			return
		}

		http.Redirect(
			w, r, withNotice("/hook/"+webhook.ID, entrypointAdded),
			http.StatusSeeOther,
		)
	}
}

// HandleEntrypointEdit handles changing an entrypoint's description.
// It writes only the description column, so the entrypoint keeps its
// URL, and an activate or deactivate saved since the page was shown
// is not undone.
func (h *Handlers) HandleEntrypointEdit() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		userID, ok := h.getUserID(r)
		if !ok {
			http.Redirect(
				w, r, "/pages/login", http.StatusSeeOther,
			)

			return
		}

		sourceID := chi.URLParam(r, "sourceID")
		entrypointID := chi.URLParam(r, "entrypointID")

		var webhook database.Webhook

		err := h.db.DB().Where(
			"id = ? AND user_id = ?", sourceID, userID,
		).First(&webhook).Error
		if err != nil {
			h.renderError(w, r, http.StatusNotFound)

			return
		}

		// The body size cap is enforced by the MaxBodySize
		// middleware, which runs before CSRF parses the form.
		err = r.ParseForm()
		if err != nil {
			h.renderError(w, r, http.StatusBadRequest)

			return
		}

		result := h.db.DB().Model(&database.Entrypoint{}).Where(
			"id = ? AND webhook_id = ?", entrypointID, webhook.ID,
		).Update("description", r.PostFormValue("description"))
		if result.Error != nil {
			h.serverError(
				w, r, "failed to edit entrypoint", result.Error,
			)

			return
		}

		// The id came from the URL and may name another webhook's
		// entrypoint, which this webhook does not have.
		if result.RowsAffected == 0 {
			h.renderError(w, r, http.StatusNotFound)

			return
		}

		http.Redirect(
			w, r, withNotice("/hook/"+webhook.ID, entrypointSaved),
			http.StatusSeeOther,
		)
	}
}

// HandleEntrypointDelete handles deleting an entrypoint.
func (h *Handlers) HandleEntrypointDelete() http.HandlerFunc {
	return h.deleteChildResource(
		"entrypointID", &database.Entrypoint{},
		"failed to delete entrypoint",
		nil,
		entrypointDeleted,
	)
}

// HandleEntrypointToggle handles toggling an entrypoint's
// active state.
func (h *Handlers) HandleEntrypointToggle() http.HandlerFunc {
	return h.toggleChildResource(
		"entrypointID",
		func(webhookID, childID string) (bool, error) {
			var ep database.Entrypoint

			err := h.db.DB().Where(
				"id = ? AND webhook_id = ?",
				childID, webhookID,
			).First(&ep).Error
			if err != nil {
				return false, err
			}

			// Only the active column: saving the whole row would
			// write back the description read above over an edit
			// saved since.
			active := !ep.Active

			return active, h.db.DB().Model(&ep).
				Update("active", active).Error
		},
		"failed to toggle entrypoint",
		entrypointActivated, entrypointDeactivated,
	)
}