const DISPLAY_AUDIO_KEY = 'qms_display_audio';

function localeToSpeechLang(locale) {
    if (locale === 'fr') return 'fr-FR';
    if (locale === 'tw') return 'ak-GH';

    return 'en-US';
}

function pickVoice(voices, locale, preference) {
    const list = voices.length ? voices : window.speechSynthesis?.getVoices() ?? [];
    if (! list.length) {
        return null;
    }

    const lang = localeToSpeechLang(locale).toLowerCase();
    const langMatches = list.filter((voice) => voice.lang?.toLowerCase().startsWith(lang.slice(0, 2)));
    const pool = langMatches.length ? langMatches : list;
    const wantFemale = preference !== 'male';

    const scored = pool.map((voice) => {
        const name = voice.name.toLowerCase();
        const female = /female|woman|zira|samantha|karen|victoria|fiona|moira|tessa|veena|lekha/.test(name);
        const male = /male|man|david|daniel|james|fred|thomas|lee|ralph/.test(name);

        let score = 0;
        if (wantFemale && female) score += 2;
        if (! wantFemale && male) score += 2;
        if (voice.default) score += 1;
        if (voice.localService) score += 1;

        return { voice, score };
    });

    scored.sort((a, b) => b.score - a.score);

    return scored[0]?.voice ?? pool[0] ?? null;
}

export function registerKioskFlow(Alpine) {
    Alpine.data('kioskFlow', (config = {}) => ({
        step: 'select',
        queueId: null,
        customerName: '',
        customerPhone: '',
        ticket: null,
        error: null,
        loading: false,
        issueUrl: config.issueUrl,
        csrf: config.csrf,

        selectQueue(id) {
            this.queueId = id;
            this.step = 'details';
        },

        async issue() {
            if (! this.queueId) return;
            this.loading = true;
            this.error = null;
            try {
                const res = await fetch(this.issueUrl, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'Accept': 'application/json',
                        'X-CSRF-TOKEN': this.csrf,
                    },
                    body: JSON.stringify({
                        queue_id: this.queueId,
                        customer_name: this.customerName || null,
                        customer_phone: this.customerPhone || null,
                    }),
                });
                const data = await res.json();
                if (! res.ok) throw new Error(data.message || 'Could not issue ticket');
                this.ticket = data.data;
                this.step = 'ticket';
            } catch (e) {
                this.error = e.message || 'Something went wrong';
            } finally {
                this.loading = false;
            }
        },

        reset() {
            this.step = 'select';
            this.queueId = null;
            this.customerName = '';
            this.customerPhone = '';
            this.ticket = null;
            this.error = null;
        },
    }));

    Alpine.data('displayBoard', (config = {}) => ({
        payload: null,
        announcedIds: {},
        isAnnouncing: false,
        speechReady: false,
        voices: [],
        dataUrl: typeof config === 'string' ? config : config.dataUrl,
        playedUrlTemplate: config.playedUrl ?? null,
        pollMs: config.pollMs ?? 1200,
        csrf: config.csrf ?? document.querySelector('meta[name="csrf-token"]')?.content ?? '',

        async poll() {
            try {
                const res = await fetch(this.dataUrl, { headers: { Accept: 'application/json' } });
                this.payload = await res.json();
                this.maybeAnnounce(this.payload?.announcements ?? []);
            } catch (e) {
                console.error('Display poll failed', e);
            }
        },

        primeSpeech() {
            if (! window.speechSynthesis) {
                return;
            }

            const loadVoices = () => {
                this.voices = window.speechSynthesis.getVoices() || [];
            };

            loadVoices();
            window.speechSynthesis.addEventListener('voiceschanged', loadVoices);
        },

        unlockSpeech() {
            if (! window.speechSynthesis) {
                return;
            }

            window.speechSynthesis.resume?.();
            window.speechSynthesis.cancel();

            const utter = new SpeechSynthesisUtterance(' ');
            utter.volume = 0;
            utter.onend = () => this.markSpeechReady();
            utter.onerror = () => this.markSpeechReady();
            window.speechSynthesis.speak(utter);
        },

        markSpeechReady() {
            this.speechReady = true;

            try {
                sessionStorage.setItem(DISPLAY_AUDIO_KEY, '1');
            } catch (e) {
                // ignore storage failures
            }

            this.maybeAnnounce(this.payload?.announcements ?? []);
        },

        maybeAnnounce(announcements) {
            if (! window.speechSynthesis || ! this.speechReady || this.isAnnouncing || ! announcements.length) {
                return;
            }

            const next = announcements.find((item) => item?.id && item?.message && ! this.announcedIds[item.id]);
            if (! next) {
                return;
            }

            this.isAnnouncing = true;
            this.announcedIds[next.id] = true;
            this.speakAnnouncement(next);
        },

        speakAnnouncement(item) {
            const repeats = Math.max(1, Number(item.repeat_count) || 1);
            const volume = Math.min(1, Math.max(0, (Number(item.volume) || 80) / 100));
            let remaining = repeats;
            let watchdog = null;

            const release = () => {
                if (watchdog) {
                    clearTimeout(watchdog);
                    watchdog = null;
                }
                this.isAnnouncing = false;
            };

            const finish = () => {
                release();
                this.ackPlayed(item.id);
                this.maybeAnnounce(this.payload?.announcements ?? []);
            };

            const fail = (reason) => {
                console.error('Announcement speech failed', reason);
                release();
                delete this.announcedIds[item.id];
            };

            const speakOnce = () => {
                window.speechSynthesis.resume?.();
                window.speechSynthesis.cancel();

                const utter = new SpeechSynthesisUtterance(item.message);
                utter.volume = volume;
                utter.lang = localeToSpeechLang(item.locale);
                const voice = pickVoice(this.voices, item.locale, item.voice);
                if (voice) {
                    utter.voice = voice;
                }

                const estimatedMs = Math.max(4000, (item.message?.length || 24) * 140);
                watchdog = setTimeout(() => {
                    if (! this.isAnnouncing) {
                        return;
                    }
                    window.speechSynthesis.cancel();
                    remaining -= 1;
                    if (remaining > 0) {
                        speakOnce();
                    } else {
                        finish();
                    }
                }, estimatedMs);

                utter.onend = () => {
                    if (watchdog) {
                        clearTimeout(watchdog);
                        watchdog = null;
                    }
                    remaining -= 1;
                    if (remaining > 0) {
                        speakOnce();
                    } else {
                        finish();
                    }
                };
                utter.onerror = (event) => fail(event);

                window.speechSynthesis.speak(utter);
            };

            speakOnce();
        },

        async ackPlayed(id) {
            if (! this.playedUrlTemplate) {
                return;
            }

            const url = this.playedUrlTemplate.replace('__ID__', String(id));

            try {
                const res = await fetch(url, {
                    method: 'POST',
                    headers: {
                        Accept: 'application/json',
                        'X-CSRF-TOKEN': this.csrf,
                    },
                });
                if (! res.ok) {
                    throw new Error(`Ack failed (${res.status})`);
                }
            } catch (e) {
                console.error('Announcement ack failed', e);
                delete this.announcedIds[id];
            }
        },

        init() {
            this.primeSpeech();

            try {
                if (sessionStorage.getItem(DISPLAY_AUDIO_KEY) === '1') {
                    this.unlockSpeech();
                }
            } catch (e) {
                // ignore storage failures
            }

            this.poll();
            setInterval(() => this.poll(), this.pollMs);
        },
    }));

    Alpine.data('mobileTracker', (pollUrl) => ({
        data: null,
        ahead: 0,
        async poll() {
            try {
                const res = await fetch(pollUrl, { headers: { Accept: 'application/json' } });
                const json = await res.json();
                this.data = json.data;
                this.ahead = json.customers_ahead ?? 0;
            } catch (e) {
                console.error('Tracker poll failed', e);
            }
        },
        init() {
            this.poll();
            setInterval(() => this.poll(), 10000);
        },
    }));
}