package api

import (
	"context"
	"encoding/json"
	"net/http"
	"slices"
	"sync"

	"github.com/ponzischeme89/memby/server/internal/adminevents"
	"github.com/ponzischeme89/memby/server/internal/store"
)

type metadataHeroSettingsState struct {
	mu    sync.RWMutex
	value store.MetadataHeroSettings
}

func (state *metadataHeroSettingsState) get() store.MetadataHeroSettings {
	state.mu.RLock()
	defer state.mu.RUnlock()
	return store.NormalizeMetadataHeroSettings(state.value)
}

func (state *metadataHeroSettingsState) set(value store.MetadataHeroSettings) {
	state.mu.Lock()
	state.value = store.NormalizeMetadataHeroSettings(value)
	state.mu.Unlock()
}

// LoadMetadataHeroSettings primes the household-wide presentation setting before the
// status endpoint starts telling televisions what to draw.
func (s *Server) LoadMetadataHeroSettings(ctx context.Context) error {
	settings, err := s.store.MetadataHeroSettings(ctx)
	if err != nil {
		return err
	}
	s.metadataHeroSettings.set(settings)
	return nil
}

type metadataHeroOption struct {
	Value       string `json:"value"`
	Label       string `json:"label"`
	Description string `json:"description"`
}

var metadataHeroOptions = []metadataHeroOption{
	{store.MetadataHeroTitle, "Movie logo or title", "The focused title's logo artwork, with a text title as the fallback."},
	{store.MetadataHeroRatings, "Ratings", "The available third-party and community ratings."},
	{store.MetadataHeroFacts, "Metadata information", "Year, runtime, classification, genres and outlined media badges."},
	{store.MetadataHeroSummary, "Plot summary", "A short overview of the focused title."},
	{store.MetadataHeroReason, "Why this was recommended", "The gateway's short explanation, such as Because you watched a related title."},
	{store.MetadataHeroTime, "Time remaining", "A resume progress bar followed by the number of minutes remaining."},
}

type metadataHeroSettingsResponse struct {
	Settings store.MetadataHeroSettings `json:"settings"`
	Options  []metadataHeroOption       `json:"options"`
}

func (s *Server) metadataHeroSettingsResponse() metadataHeroSettingsResponse {
	return metadataHeroSettingsResponse{
		Settings: s.metadataHeroSettings.get(),
		Options:  metadataHeroOptions,
	}
}

func (s *Server) handleAdminMetadataHeroSettings(w http.ResponseWriter, r *http.Request) {
	if r.Method == http.MethodGet {
		writeJSON(w, http.StatusOK, s.metadataHeroSettingsResponse())
		return
	}
	var req store.MetadataHeroSettings
	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 8<<10)).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "malformed request body")
		return
	}
	previous := s.metadataHeroSettings.get()
	_, operator, _ := s.browserSession(r, adminSessionPurpose)
	req.UpdatedBy = operator
	stored, err := s.store.SetMetadataHeroSettings(r.Context(), req)
	if err != nil {
		s.loggerFor(r.Context()).Error("metadata hero settings write failed", "error", err)
		writeError(w, http.StatusInternalServerError, "could not save metadata hero settings")
		return
	}
	s.metadataHeroSettings.set(stored)
	if !slices.Equal(previous.ContentOrder, stored.ContentOrder) {
		s.publishAdmin(r.Context(), adminevents.Event{
			Type:     adminevents.TypeSettingsChanged,
			Severity: adminevents.SeverityInfo,
			Title:    "Metadata hero changed",
			Summary:  "The household-wide metadata hero content order was changed",
			Actor:    operator,
			Link:     "/admin/metadata-hero",
		})
	}
	writeJSON(w, http.StatusOK, s.metadataHeroSettingsResponse())
}