/**
 * Shared helpers and Alpine components for live transcription updates via Reverb.
 */

const BADGE_COLORS = {
    done: 'teal',
    processing: 'amber',
    pending: 'amber',
    failed: 'red',
    cancelled: 'zinc',
};

export function badgeColorFor(status) {
    return BADGE_COLORS[status] || 'zinc';
}

/** @deprecated Use badgeColorFor — kept for any leftover callers */
export function badgeClassFor(status) {
    return badgeColorFor(status);
}

export function formatElapsed(seconds) {
    const total = Math.max(0, Math.round(Number(seconds) || 0));
    const minutes = Math.floor(total / 60);
    const remain = total % 60;

    if (minutes === 0) {
        return remain + 's';
    }

    return minutes + 'm ' + String(remain).padStart(2, '0') + 's';
}

export function formatDuration(seconds) {
    const total = Math.max(0, Math.round(Number(seconds) || 0));
    const minutes = Math.floor(total / 60);
    const remain = total % 60;

    return minutes + ':' + String(remain).padStart(2, '0');
}

export function formatTimestamp(value) {
    const date = new Date(value);

    if (Number.isNaN(date.getTime())) {
        return value;
    }

    const pad = (n) => String(n).padStart(2, '0');

    return date.getFullYear()
        + '-' + pad(date.getMonth() + 1)
        + '-' + pad(date.getDate())
        + ' ' + pad(date.getHours())
        + ':' + pad(date.getMinutes());
}

function formatWordCount(count) {
    const n = Number(count) || 0;

    return n > 0 ? n.toLocaleString() : '—';
}

function subscribeToRecording(recordingId, handler) {
    if (!window.Echo) {
        return () => {};
    }

    const channelName = 'recording.' + recordingId;
    const channel = window.Echo.private(channelName);

    channel.listen('.RecordingTranscriptionUpdated', handler);

    return () => {
        window.Echo.leave(channelName);
    };
}

function subscribeToRecordings(recordingIds, handler) {
    const leaveFns = recordingIds.map((id) => subscribeToRecording(id, handler));

    return () => {
        leaveFns.forEach((leave) => leave());
    };
}

/**
 * Show-page Alpine component: Echo push + local elapsed tick + optional status hydrate.
 */
export function transcriptionMonitor({ statusUrl, initial }) {
    return {
        statusUrl,
        status: {
            ...initial,
            badge_color: badgeColorFor(initial.status),
        },
        pollError: null,
        tickTimer: null,
        leaveChannel: null,

        get badgeColor() {
            return badgeColorFor(this.status.status);
        },

        get startButtonLabel() {
            if (this.status.is_active) {
                return 'Restart transcription';
            }

            return this.status.has_transcript ? 'Re-transcribe' : 'Start transcription';
        },

        start() {
            this.leaveChannel = subscribeToRecording(this.status.id, (event) => {
                if (Number(event.id) !== Number(this.status.id)) {
                    return;
                }

                this.applyPayload(event);
            });

            if (this.status.is_active) {
                this.beginTick();
                this.hydrateOnce();
            }
        },

        destroy() {
            this.stopTick();

            if (this.leaveChannel) {
                this.leaveChannel();
                this.leaveChannel = null;
            }
        },

        applyPayload(payload) {
            const wasActive = this.status.is_active;
            this.status = {
                ...this.status,
                ...payload,
                badge_color: badgeColorFor(payload.status ?? this.status.status),
            };
            this.pollError = null;

            if (this.status.is_active) {
                this.beginTick();
            } else {
                this.stopTick();
            }

            if (wasActive && !this.status.is_active
                && !this.status.has_transcript
                && this.status.status !== 'failed'
                && this.status.status !== 'cancelled') {
                window.location.reload();
            }
        },

        beginTick() {
            if (this.tickTimer) {
                return;
            }

            this.tickTimer = setInterval(() => this.tickElapsed(), 1000);
        },

        stopTick() {
            if (this.tickTimer) {
                clearInterval(this.tickTimer);
                this.tickTimer = null;
            }
        },

        tickElapsed() {
            if (!this.status.is_active || this.status.elapsed_seconds == null) {
                return;
            }

            this.status.elapsed_seconds += 1;
            this.status.elapsed_human = formatElapsed(this.status.elapsed_seconds);
        },

        async hydrateOnce() {
            if (!this.statusUrl) {
                return;
            }

            try {
                const response = await fetch(this.statusUrl, {
                    headers: { Accept: 'application/json' },
                });

                if (!response.ok) {
                    throw new Error('Status request failed (' + response.status + ')');
                }

                this.applyPayload(await response.json());
            } catch (error) {
                this.pollError = error.message || 'Could not refresh progress.';
            }
        },

        formatElapsed,
        formatDuration,
        formatTimestamp,
    };
}

/**
 * Index-page Alpine component: patch row status from Reverb events.
 */
export function recordingsIndex({ recordings, pendingCount }) {
    const byId = {};

    for (const row of recordings) {
        byId[row.id] = row;
    }

    return {
        rows: byId,
        pendingCount: Number(pendingCount) || 0,
        leaveChannel: null,
        playingId: null,
        isPlaying: false,

        start() {
            this.leaveChannel = subscribeToRecordings(Object.keys(this.rows), (event) => {
                this.applyPayload(event);
            });
        },

        destroy() {
            if (this.leaveChannel) {
                this.leaveChannel();
                this.leaveChannel = null;
            }

            const player = this.$refs.player;

            if (player) {
                player.pause();
                player.removeAttribute('src');
                player.load();
            }
        },

        syncPlayer() {
            const player = this.$refs.player;

            this.isPlaying = Boolean(player && !player.paused && !player.ended);

            if (player?.ended) {
                this.playingId = null;
            }
        },

        isPlayingRow(id) {
            return this.playingId === id && this.isPlaying;
        },

        togglePlay(id, url) {
            const player = this.$refs.player;

            if (!player) {
                return;
            }

            if (this.playingId === id && this.isPlaying) {
                player.pause();

                return;
            }

            if (this.playingId !== id) {
                player.src = url;
                this.playingId = id;
            }

            player.play().catch(() => {
                this.playingId = null;
                this.isPlaying = false;
            });
        },

        applyPayload(payload) {
            const id = payload.id;

            if (!this.rows[id]) {
                return;
            }

            const previousStatus = this.rows[id].status;
            const next = {
                ...this.rows[id],
                status: payload.status,
                status_label: payload.status_label,
                progress: payload.progress,
                percent: payload.percent,
                is_active: payload.is_active,
                word_count: payload.word_count ?? this.rows[id].word_count,
                word_count_display: formatWordCount(payload.word_count ?? this.rows[id].word_count),
                badge_color: badgeColorFor(payload.status),
            };

            this.rows[id] = next;

            const wasQueueable = ['pending', 'failed', 'cancelled'].includes(previousStatus);
            const isQueueable = ['pending', 'failed', 'cancelled'].includes(payload.status);

            if (wasQueueable && !isQueueable) {
                this.pendingCount = Math.max(0, this.pendingCount - 1);
            } else if (!wasQueueable && isQueueable) {
                this.pendingCount += 1;
            }
        },

        row(id) {
            return this.rows[id] || {};
        },
    };
}