package web

import (
	"net/http"
	"time"

	"github.com/gramanas/blogspace/internal/store"
)

func (s *Server) handleDesignForm(w http.ResponseWriter, r *http.Request) {
	blog := currentBlog(r)
	images, _, err := blogStore(r).ListFiles(r.Context(), "image", "", 0, 0)
	if err != nil {
		s.serverError(w, err)
		return
	}
	s.render(w, r, "dashboard/design.html", designData(ParseTheme(blog.ThemeJSON), images))
}

// designData is what design.html shows; "today" is the sample for the date formats.
func designData(theme Theme, images []store.File) map[string]any {
	return map[string]any{"theme": theme, "images": images, "presets": Presets(), "today": time.Now()}
}

func (s *Server) handleDesign(w http.ResponseWriter, r *http.Request) {
	blog := currentBlog(r)
	theme := ThemeFromForm(ParseTheme(blog.ThemeJSON), r.Form)
	// Optional direct uploads from the design form.
	for field, dst := range map[string]*string{"bg_image_file": &theme.BgImage, "header_image_file": &theme.HeaderImage, "logo_file": &theme.Logo, "favicon_file": &theme.Favicon} {
		img, err := s.readUpload(r, field, true)
		if err != nil {
			images, _, _ := blogStore(r).ListFiles(r.Context(), "image", "", 0, 0)
			d := designData(theme, images)
			d["error"] = err.Error()
			s.renderStatus(w, r, http.StatusBadRequest, "dashboard/design.html", d)
			return
		}
		if img != nil {
			*dst = img.ID.String()
		}
	}
	if err := blogStore(r).UpdateTheme(r.Context(), theme.JSON()); err != nil {
		s.serverError(w, err)
		return
	}
	redirectOK(w, r, "/b/"+blog.Subdomain+"/design", s.tr(r, "Design saved. Refresh your blog to see it."))
}

// handleDesignPreset applies a colour scheme straight away; it is a separate
// form so it cannot be confused with the unsaved edits of the main one.
func (s *Server) handleDesignPreset(w http.ResponseWriter, r *http.Request) {
	blog := currentBlog(r)
	p, ok := PresetByKey(r.FormValue("preset"))
	if !ok {
		s.plainError(w, http.StatusBadRequest, s.tr(r, "Unknown colour scheme."))
		return
	}
	theme := ParseTheme(blog.ThemeJSON).WithPreset(p)
	if err := blogStore(r).UpdateTheme(r.Context(), theme.JSON()); err != nil {
		s.serverError(w, err)
		return
	}
	redirectOK(w, r, "/b/"+blog.Subdomain+"/design", s.trf(r, "Applied the %s scheme. Refresh your blog to see it.", s.tr(r, p.Name)))
}

// handleDesignReset restores the defaults, layout modules included; images
// stay in the library and the menu is left alone.
func (s *Server) handleDesignReset(w http.ResponseWriter, r *http.Request) {
	blog := currentBlog(r)
	if err := blogStore(r).UpdateTheme(r.Context(), DefaultTheme().JSON()); err != nil {
		s.serverError(w, err)
		return
	}
	if err := blogStore(r).ResetModules(r.Context()); err != nil {
		s.serverError(w, err)
		return
	}
	redirectOK(w, r, "/b/"+blog.Subdomain+"/design", s.tr(r, "Design and layout reset to the defaults."))
}