// ==========================================================================
// Plyr Event Listeners
// ==========================================================================

import controls from './controls';
import ui from './ui';
import { repaint } from './utils/animation';
import browser from './utils/browser';
import { getElement, getElements, matches, toggleClass, toggleHidden } from './utils/elements';
import { on, once, toggleListener, triggerEvent } from './utils/events';
import is from './utils/is';

class Listeners {
    constructor(player) {
        this.player = player;
        this.lastKey = null;
        this.focusTimer = null;
        this.lastKeyDown = null;

        this.handleKey = this.handleKey.bind(this);
        this.toggleMenu = this.toggleMenu.bind(this);
        this.setTabFocus = this.setTabFocus.bind(this);
        this.firstTouch = this.firstTouch.bind(this);
    }

    // Handle key presses
    handleKey(event) {
        const { player } = this;
        const { elements } = player;
        const code = event.keyCode ? event.keyCode : event.which;
        const pressed = event.type === 'keydown';
        const repeat = pressed && code === this.lastKey;

        // Bail if a modifier key is set
        if (event.altKey || event.ctrlKey || event.metaKey || event.shiftKey) {
            return;
        }

        // If the event is bubbled from the media element
        // Firefox doesn't get the keycode for whatever reason
        if (!is.number(code)) {
            return;
        }

        // Seek by the number keys
        const seekByKey = () => {
            // Divide the max duration into 10th's and times by the number value
            player.currentTime = (player.duration / 10) * (code - 48);
        };

        // Handle the key on keydown
        // Reset on keyup
        if (pressed) {
            // Check focused element
            // and if the focused element is not editable (e.g. text input)
            // and any that accept key input http://webaim.org/techniques/keyboard/
            const focused = document.activeElement;
            if (is.element(focused)) {
                const { editable } = player.config.selectors;
                const { seek } = elements.inputs;

                if (focused !== seek && matches(focused, editable)) {
                    return;
                }

                if (event.which === 32 && matches(focused, 'button, [role^="menuitem"]')) {
                    return;
                }
            }

            // Which keycodes should we prevent default
            const preventDefault = [32, 37, 38, 39, 40, 48, 49, 50, 51, 52, 53, 54, 56, 57, 67, 70, 73, 75, 76, 77, 79];

            // If the code is found prevent default (e.g. prevent scrolling for arrows)
            if (preventDefault.includes(code)) {
                event.preventDefault();
                event.stopPropagation();
            }

            switch (code) {
                case 48:
                case 49:
                case 50:
                case 51:
                case 52:
                case 53:
                case 54:
                case 55:
                case 56:
                case 57:
                    // 0-9
                    if (!repeat) {
                        seekByKey();
                    }
                    break;

                case 32:
                case 75:
                    // Space and K key
                    if (!repeat) {
                        player.togglePlay();
                    }
                    break;

                case 38:
                    // Arrow up
                    player.increaseVolume(0.1);
                    break;

                case 40:
                    // Arrow down
                    player.decreaseVolume(0.1);
                    break;

                case 77:
                    // M key
                    if (!repeat) {
                        player.muted = !player.muted;
                    }
                    break;

                case 39:
                    // Arrow forward
                    player.forward();
                    break;

                case 37:
                    // Arrow back
                    player.rewind();
                    break;

                case 70:
                    // F key
                    player.fullscreen.toggle();
                    break;

                case 67:
                    // C key
                    if (!repeat) {
                        player.toggleCaptions();
                    }
                    break;

                case 76:
                    // L key
                    player.loop = !player.loop;
                    break;

                    /* case 73:
                    this.setLoop('start');
                    break;

                case 76:
                    this.setLoop();
                    break;

                case 79:
                    this.setLoop('end');
                    break; */

                default:
                    break;
            }

            // Escape is handle natively when in full screen
            // So we only need to worry about non native
            if (!player.fullscreen.enabled && player.fullscreen.active && code === 27) {
                player.fullscreen.toggle();
            }

            // Store last code for next cycle
            this.lastKey = code;
        } else {
            this.lastKey = null;
        }
    }

    // Toggle menu
    toggleMenu(event) {
        controls.toggleMenu.call(this.player, event);
    }

    // Device is touch enabled
    firstTouch() {
        const { player } = this;
        const { elements } = player;

        player.touch = true;

        // Add touch class
        toggleClass(elements.container, player.config.classNames.isTouch, true);
    }

    setTabFocus(event) {
        const { player } = this;
        const { elements } = player;

        clearTimeout(this.focusTimer);

        // Ignore any key other than tab
        if (event.type === 'keydown' && event.which !== 9) {
            return;
        }

        // Store reference to event timeStamp
        if (event.type === 'keydown') {
            this.lastKeyDown = event.timeStamp;
        }

        // Remove current classes
        const removeCurrent = () => {
            const className = player.config.classNames.tabFocus;
            const current = getElements.call(player, `.${className}`);
            toggleClass(current, className, false);
        };

        // Determine if a key was pressed to trigger this event
        const wasKeyDown = event.timeStamp - this.lastKeyDown <= 20;

        // Ignore focus events if a key was pressed prior
        if (event.type === 'focus' && !wasKeyDown) {
            return;
        }

        // Remove all current
        removeCurrent();

        // Delay the adding of classname until the focus has changed
        // This event fires before the focusin event
        this.focusTimer = setTimeout(() => {
            const focused = document.activeElement;

            // Ignore if current focus element isn't inside the player
            if (!elements.container.contains(focused)) {
                return;
            }

            toggleClass(document.activeElement, player.config.classNames.tabFocus, true);
        }, 10);
    }

    // Global window & document listeners
    global(toggle = true) {
        const { player } = this;

        // Keyboard shortcuts
        if (player.config.keyboard.global) {
            toggleListener.call(player, window, 'keydown keyup', this.handleKey, toggle, false);
        }

        // Click anywhere closes menu
        toggleListener.call(player, document.body, 'click', this.toggleMenu, toggle);

        // Detect touch by events
        once.call(player, document.body, 'touchstart', this.firstTouch);

        // Tab focus detection
        toggleListener.call(player, document.body, 'keydown focus blur', this.setTabFocus, toggle, false, true);
    }

    // Container listeners
    container() {
        const { player } = this;
        const { elements } = player;

        // Keyboard shortcuts
        if (!player.config.keyboard.global && player.config.keyboard.focused) {
            on.call(player, elements.container, 'keydown keyup', this.handleKey, false);
        }

        // Toggle controls on mouse events and entering fullscreen
        on.call(
            player,
            elements.container,
            'mousemove mouseleave touchstart touchmove enterfullscreen exitfullscreen',
            event => {
                const { controls } = elements;

                // Remove button states for fullscreen
                if (controls && event.type === 'enterfullscreen') {
                    controls.pressed = false;
                    controls.hover = false;
                }

                // Show, then hide after a timeout unless another control event occurs
                const show = ['touchstart', 'touchmove', 'mousemove'].includes(event.type);

                let delay = 0;

                if (show) {
                    ui.toggleControls.call(player, true);
                    // Use longer timeout for touch devices
                    delay = player.touch ? 3000 : 2000;
                }

                // Clear timer
                clearTimeout(player.timers.controls);

                // Set new timer to prevent flicker when seeking
                player.timers.controls = setTimeout(() => ui.toggleControls.call(player, false), delay);
            },
        );
    }

    // Listen for media events
    media() {
        const { player } = this;
        const { elements } = player;

        // Time change on media
        on.call(player, player.media, 'timeupdate seeking seeked', event => controls.timeUpdate.call(player, event));

        // Display duration
        on.call(player, player.media, 'durationchange loadeddata loadedmetadata', event =>
            controls.durationUpdate.call(player, event),
        );

        // Check for audio tracks on load
        // We can't use `loadedmetadata` as it doesn't seem to have audio tracks at that point
        on.call(player, player.media, 'canplay', () => {
            toggleHidden(elements.volume, !player.hasAudio);
            toggleHidden(elements.buttons.mute, !player.hasAudio);
        });

        // Handle the media finishing
        on.call(player, player.media, 'ended', () => {
            // Show poster on end
            if (player.isHTML5 && player.isVideo && player.config.resetOnEnd) {
                // Restart
                player.restart();
            }
        });

        // Check for buffer progress
        on.call(player, player.media, 'progress playing seeking seeked', event =>
            controls.updateProgress.call(player, event),
        );

        // Handle volume changes
        on.call(player, player.media, 'volumechange', event => controls.updateVolume.call(player, event));

        // Handle play/pause
        on.call(player, player.media, 'playing play pause ended emptied timeupdate', event =>
            ui.checkPlaying.call(player, event),
        );

        // Loading state
        on.call(player, player.media, 'waiting canplay seeked playing', event => ui.checkLoading.call(player, event));

        // If autoplay, then load advertisement if required
        // TODO: Show some sort of loading state while the ad manager loads else there's a delay before ad shows
        on.call(player, player.media, 'playing', () => {
            if (!player.ads) {
                return;
            }

            // If ads are enabled, wait for them first
            if (player.ads.enabled && !player.ads.initialized) {
                // Wait for manager response
                player.ads.managerPromise.then(() => player.ads.play()).catch(() => player.play());
            }
        });

        // Click video
        if (player.supported.ui && player.config.clickToPlay && !player.isAudio) {
            // Re-fetch the wrapper
            const wrapper = getElement.call(player, `.${player.config.classNames.video}`);

            // Bail if there's no wrapper (this should never happen)
            if (!is.element(wrapper)) {
                return;
            }

            // On click play, pause or restart
            on.call(player, elements.container, 'click', event => {
                const targets = [elements.container, wrapper];

                // Ignore if click if not container or in video wrapper
                if (!targets.includes(event.target) && !wrapper.contains(event.target)) {
                    return;
                }

                // Touch devices will just show controls (if hidden)
                if (player.touch && player.config.hideControls) {
                    return;
                }

                if (player.ended) {
                    player.restart();
                    player.play();
                } else {
                    player.togglePlay();
                }
            });
        }

        // Disable right click
        if (player.supported.ui && player.config.disableContextMenu) {
            on.call(
                player,
                elements.wrapper,
                'contextmenu',
                event => {
                    event.preventDefault();
                },
                false,
            );
        }

        // Volume change
        on.call(player, player.media, 'volumechange', () => {
            // Save to storage
            player.storage.set({
                volume: player.volume,
                muted: player.muted,
            });
        });

        // Speed change
        on.call(player, player.media, 'ratechange', () => {
            // Update UI
            controls.updateSetting.call(player, 'speed');

            // Save to storage
            player.storage.set({ speed: player.speed });
        });

        // Quality change
        on.call(player, player.media, 'qualitychange', event => {
            // Update UI
            controls.updateSetting.call(player, 'quality', null, event.detail.quality);
        });

        // Update download link
        on.call(player, player.media, 'ready qualitychange', () => {
            controls.setDownloadLink.call(player);
        });

        // Proxy events to container
        // Bubble up key events for Edge
        const proxyEvents = player.config.events.concat(['keyup', 'keydown']).join(' ');

        on.call(player, player.media, proxyEvents, event => {
            let { detail = {} } = event;

            // Get error details from media
            if (event.type === 'error') {
                detail = player.media.error;
            }

            triggerEvent.call(player, elements.container, event.type, true, detail);
        });
    }

    // Run default and custom handlers
    proxy(event, defaultHandler, customHandlerKey) {
        const { player } = this;
        const customHandler = player.config.listeners[customHandlerKey];
        const hasCustomHandler = is.function(customHandler);
        let returned = true;

        // Execute custom handler
        if (hasCustomHandler) {
            returned = customHandler.call(player, event);
        }

        // Only call default handler if not prevented in custom handler
        if (returned && is.function(defaultHandler)) {
            defaultHandler.call(player, event);
        }
    }

    // Trigger custom and default handlers
    bind(element, type, defaultHandler, customHandlerKey, passive = true) {
        const { player } = this;
        const customHandler = player.config.listeners[customHandlerKey];
        const hasCustomHandler = is.function(customHandler);

        on.call(
            player,
            element,
            type,
            event => this.proxy(event, defaultHandler, customHandlerKey),
            passive && !hasCustomHandler,
        );
    }

    // Listen for control events
    controls() {
        const { player } = this;
        const { elements } = player;

        // IE doesn't support input event, so we fallback to change
        const inputEvent = browser.isIE ? 'change' : 'input';

        // Play/pause toggle
        if (elements.buttons.play) {
            Array.from(elements.buttons.play).forEach(button => {
                this.bind(button, 'click', player.togglePlay, 'play');
            });
        }

        // Pause
        this.bind(elements.buttons.restart, 'click', player.restart, 'restart');

        // Rewind
        this.bind(elements.buttons.rewind, 'click', player.rewind, 'rewind');

        // Rewind
        this.bind(elements.buttons.fastForward, 'click', player.forward, 'fastForward');

        // Mute toggle
        this.bind(
            elements.buttons.mute,
            'click',
            () => {
                player.muted = !player.muted;
            },
            'mute',
        );

        // Captions toggle
        this.bind(elements.buttons.captions, 'click', () => player.toggleCaptions());

        // Download
        this.bind(
            elements.buttons.download,
            'click',
            () => {
                triggerEvent.call(player, player.media, 'download');
            },
            'download',
        );

        // Fullscreen toggle
        this.bind(
            elements.buttons.fullscreen,
            'click',
            () => {
                player.fullscreen.toggle();
            },
            'fullscreen',
        );

        // Picture-in-Picture
        this.bind(
            elements.buttons.pip,
            'click',
            () => {
                player.pip = 'toggle';
            },
            'pip',
        );

        // Airplay
        this.bind(elements.buttons.airplay, 'click', player.airplay, 'airplay');

        // Settings menu - click toggle
        this.bind(elements.buttons.settings, 'click', event => {
            // Prevent the document click listener closing the menu
            event.stopPropagation();

            controls.toggleMenu.call(player, event);
        });

        // Settings menu - keyboard toggle
        // We have to bind to keyup otherwise Firefox triggers a click when a keydown event handler shifts focus
        // https://bugzilla.mozilla.org/show_bug.cgi?id=1220143
        this.bind(
            elements.buttons.settings,
            'keyup',
            event => {
                const code = event.which;

                // We only care about space and return
                if (![13, 32].includes(code)) {
                    return;
                }

                // Because return triggers a click anyway, all we need to do is set focus
                if (code === 13) {
                    controls.focusFirstMenuItem.call(player, null, true);
                    return;
                }

                // Prevent scroll
                event.preventDefault();

                // Prevent playing video (Firefox)
                event.stopPropagation();

                // Toggle menu
                controls.toggleMenu.call(player, event);
            },
            null,
            false, // Can't be passive as we're preventing default
        );

        // Escape closes menu
        this.bind(elements.settings.menu, 'keydown', event => {
            if (event.which === 27) {
                controls.toggleMenu.call(player, event);
            }
        });

        // Set range input alternative "value", which matches the tooltip time (#954)
        this.bind(elements.inputs.seek, 'mousedown mousemove', event => {
            const rect = elements.progress.getBoundingClientRect();
            const percent = (100 / rect.width) * (event.pageX - rect.left);
            event.currentTarget.setAttribute('seek-value', percent);
        });

        // Pause while seeking
        this.bind(elements.inputs.seek, 'mousedown mouseup keydown keyup touchstart touchend', event => {
            const seek = event.currentTarget;
            const code = event.keyCode ? event.keyCode : event.which;
            const attribute = 'play-on-seeked';

            if (is.keyboardEvent(event) && (code !== 39 && code !== 37)) {
                return;
            }

            // Was playing before?
            const play = seek.hasAttribute(attribute);

            // Done seeking
            const done = ['mouseup', 'touchend', 'keyup'].includes(event.type);

            // If we're done seeking and it was playing, resume playback
            if (play && done) {
                seek.removeAttribute(attribute);
                player.play();
            } else if (!done && player.playing) {
                seek.setAttribute(attribute, '');
                player.pause();
            }
        });

        // Fix range inputs on iOS
        // Super weird iOS bug where after you interact with an <input type="range">,
        // it takes over further interactions on the page. This is a hack
        if (browser.isIos) {
            const inputs = getElements.call(player, 'input[type="range"]');
            Array.from(inputs).forEach(input => this.bind(input, inputEvent, event => repaint(event.target)));
        }

        // Seek
        this.bind(
            elements.inputs.seek,
            inputEvent,
            event => {
                const seek = event.currentTarget;

                // If it exists, use seek-value instead of "value" for consistency with tooltip time (#954)
                let seekTo = seek.getAttribute('seek-value');

                if (is.empty(seekTo)) {
                    seekTo = seek.value;
                }

                seek.removeAttribute('seek-value');

                player.currentTime = (seekTo / seek.max) * player.duration;
            },
            'seek',
        );

        // Seek tooltip
        this.bind(elements.progress, 'mouseenter mouseleave mousemove', event =>
            controls.updateSeekTooltip.call(player, event),
        );

        // Polyfill for lower fill in <input type="range"> for webkit
        if (browser.isWebkit) {
            Array.from(getElements.call(player, 'input[type="range"]')).forEach(element => {
                this.bind(element, 'input', event => controls.updateRangeFill.call(player, event.target));
            });
        }

        // Current time invert
        // Only if one time element is used for both currentTime and duration
        if (player.config.toggleInvert && !is.element(elements.display.duration)) {
            this.bind(elements.display.currentTime, 'click', () => {
                // Do nothing if we're at the start
                if (player.currentTime === 0) {
                    return;
                }

                player.config.invertTime = !player.config.invertTime;

                controls.timeUpdate.call(player);
            });
        }

        // Volume
        this.bind(
            elements.inputs.volume,
            inputEvent,
            event => {
                player.volume = event.target.value;
            },
            'volume',
        );

        // Update controls.hover state (used for ui.toggleControls to avoid hiding when interacting)
        this.bind(elements.controls, 'mouseenter mouseleave', event => {
            elements.controls.hover = !player.touch && event.type === 'mouseenter';
        });

        // Update controls.pressed state (used for ui.toggleControls to avoid hiding when interacting)
        this.bind(elements.controls, 'mousedown mouseup touchstart touchend touchcancel', event => {
            elements.controls.pressed = ['mousedown', 'touchstart'].includes(event.type);
        });

        // Show controls when they receive focus (e.g., when using keyboard tab key)
        this.bind(elements.controls, 'focusin', () => {
            const { config, elements, timers } = player;

            // Skip transition to prevent focus from scrolling the parent element
            toggleClass(elements.controls, config.classNames.noTransition, true);

            // Toggle
            ui.toggleControls.call(player, true);

            // Restore transition
            setTimeout(() => {
                toggleClass(elements.controls, config.classNames.noTransition, false);
            }, 0);

            // Delay a little more for mouse users
            const delay = this.touch ? 3000 : 4000;

            // Clear timer
            clearTimeout(timers.controls);

            // Hide again after delay
            timers.controls = setTimeout(() => ui.toggleControls.call(player, false), delay);
        });

        // Mouse wheel for volume
        this.bind(
            elements.inputs.volume,
            'wheel',
            event => {
                // Detect "natural" scroll - suppored on OS X Safari only
                // Other browsers on OS X will be inverted until support improves
                const inverted = event.webkitDirectionInvertedFromDevice;

                // Get delta from event. Invert if `inverted` is true
                const [x, y] = [event.deltaX, -event.deltaY].map(value => (inverted ? -value : value));

                // Using the biggest delta, normalize to 1 or -1 (or 0 if no delta)
                const direction = Math.sign(Math.abs(x) > Math.abs(y) ? x : y);

                // Change the volume by 2%
                player.increaseVolume(direction / 50);

                // Don't break page scrolling at max and min
                const { volume } = player.media;
                if ((direction === 1 && volume < 1) || (direction === -1 && volume > 0)) {
                    event.preventDefault();
                }
            },
            'volume',
            false,
        );
    }
}

export default Listeners;