package handlers

// Page handlers for the Custom Views shell (t-paliad-144 Phase A2).
//
// Three URLs:
//   GET /views                  — landing; redirects to most-recently-used
//                                  saved view, or shows the empty/onboarding
//                                  card.
//   GET /views/{slug}           — render a saved or system view.
//   GET /views/new              — view editor (blank slate).
//   GET /views/{slug}/edit      — view editor (edit existing).
//
// Each route serves the static dist HTML; the client bundle (views.ts /
// views-editor.ts) hydrates via /api/* on load.

import (
	"net/http"
)

// GET /views — landing.
//
// Behaviour matches design Q10 most-recently-used:
//   - If the caller has a saved view with last_used_at set → 302 to it.
//   - Otherwise serve the onboarding shell (the views.html dist file
//     handles the empty state in JS).
func handleViewsLandingPage(w http.ResponseWriter, r *http.Request) {
	if !requireDB(w) {
		return
	}
	uid, ok := requireUser(w, r)
	if !ok {
		return
	}
	if dbSvc.userView != nil {
		mr, err := dbSvc.userView.MostRecent(r.Context(), uid)
		if err == nil && mr != nil {
			http.Redirect(w, r, "/views/"+mr.Slug, http.StatusFound)
			return
		}
	}
	http.ServeFile(w, r, "dist/views.html")
}

// GET /views/{slug} — saved or system view shell.
//
// The handler doesn't validate the slug here — the client bundle calls
// POST /api/views/{slug}/run and lets the API surface the 404 with a
// proper empty-state. This keeps the page surface trivially cacheable.
func handleViewsShellPage(w http.ResponseWriter, r *http.Request) {
	http.ServeFile(w, r, "dist/views.html")
}

// GET /views/new — editor with a blank slate.
func handleViewsNewPage(w http.ResponseWriter, r *http.Request) {
	http.ServeFile(w, r, "dist/views-editor.html")
}

// GET /views/{slug}/edit — editor for an existing saved view.
func handleViewsEditPage(w http.ResponseWriter, r *http.Request) {
	http.ServeFile(w, r, "dist/views-editor.html")
}