// ==========================================================================
// HTML5 Media Player
// ==========================================================================

// Variables
// -------------------------------
// Colors
@blue:                      #3498DB;
@gray-dark:                 #343f4a;
@gray:                      #565d64;
@gray-light:                #cbd0d3;
@off-white:                 #d6dadd;

// Font sizes
@font-size-small:           14px;
@font-size-base:            16px;
@font-size-large:           ceil((@font-size-base * 1.5)); 

// Controls
@control-spacing:           10px;
@controls-bg:               @gray-dark;
@control-bg-hover:          @blue;
@control-color:             @gray-light;
@control-color-inactive:    @gray;
@control-color-hover:       #fff;

// Tooltips
@tooltip-bg:                @controls-bg;
@tooltip-color:             #fff;
@tooltip-padding:           @control-spacing;   
@tooltip-arrow-size:        5px;
@tooltip-radius:            3px;

// Progress
@progress-bg:               rgba(red(@gray), green(@gray), blue(@gray), .2);
@progress-playing-bg:       @blue;
@progress-buffered-bg:      rgba(red(@gray), green(@gray), blue(@gray), .25);
@progress-loading-size:     40px;
@progress-loading-bg:       rgba(0,0,0, .15);

// Volume
@volume-track-height:       6px;
@volume-track-bg:           @gray;
@volume-thumb-height:       (@volume-track-height * 2);
@volume-thumb-width:        (@volume-track-height * 2);
@volume-thumb-bg:           @control-color;
@volume-thumb-bg-focus:     @control-bg-hover;

// Breakpoints
@bp-control-split:          560px; // When controls split into left/right
@bp-captions-large:         768px; // When captions jump to the larger font size

// Utility classes & mixins
// -------------------------------
// Screen reader only
.sr-only {
    position: absolute !important;
    clip: rect(1px, 1px, 1px, 1px);
    padding: 0 !important;
    border: 0 !important;
    height: 1px !important;
    width: 1px !important;
    overflow: hidden;
}
// Contain floats: nicolasgallagher.com/micro-clearfix-hack/
.clearfix() {
    zoom: 1;
    &:before, 
    &:after { content: ""; display: table; }
    &:after { clear: both; }
}
// Tab focus styles
.tab-focus() {
    outline: thin dotted #000;
    outline-offset: 0;
}

// Animation
// ---------------------------------------
@keyframes progress {
    to { background-position: @progress-loading-size 0; }
}

// <input type="range"> styling
// ---------------------------------------
.volume-thumb() {
    height: @volume-thumb-height;
    width: @volume-thumb-width;
    background: @volume-thumb-bg;
    border: 0;
    border-radius: (@volume-thumb-height / 2);
    transition: background .3s ease;
    cursor: ew-resize;
}
.volume-track() {
    height: @volume-track-height;
    background: @volume-track-bg;
    border: 0;
    border-radius: (@volume-track-height / 2);
}
.seek-thumb() {
    background: transparent;
    border: 0;
    width: (@control-spacing * 2);
    height: @control-spacing;
}
.seek-track() {
    background: none;
    border: 0;
}

// Font smoothing
// ---------------------------------------
.font-smoothing(@mode: on) when (@mode = on) {
    -moz-osx-font-smoothing: grayscale;
    -webkit-font-smoothing: antialiased;
}
.font-smoothing(@mode: on) when (@mode = off) {
    -moz-osx-font-smoothing: auto;
    -webkit-font-smoothing: subpixel-antialiased;
}

// Styles
// -------------------------------
// Base 
.player {
    position: relative;
    max-width: 100%;
    min-width: 290px;

    // border-box everything
    // http://paulirish.com/2012/box-sizing-border-box-ftw/
    &,
    *,
    *::after,
    *::before { 
        box-sizing: border-box; 
    }

    // For video
    &-video-wrapper {
        position: relative;
    }
    video {
        width: 100%;
        height: auto;
        vertical-align: middle;
    }

    // Captions
    &-captions {
        display: none;
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        padding: 20px;
        min-height: 2.5em;
        color: #fff;
        font-size: @font-size-base;
        font-weight: 600;
        text-shadow: 
        -1px -1px 0 @gray, 
        1px -1px 0 @gray, 
        -1px 1px 0 @gray, 
        1px 1px 0 @gray;
        text-align: center;
        .font-smoothing();

        @media (min-width: @bp-captions-large) {
            font-size: @font-size-large;
        }
    }
    &.captions-active &-captions {
        display: block;
    }

    // Player controls
    &-controls {
        .clearfix();
        .font-smoothing();
        position: relative;
        padding: @control-spacing;
        background: @controls-bg;
        line-height: 1;
        text-align: center;

        // Layout
        &-right {
            display: block;
            margin: @control-spacing auto 0;
        }
        @media (min-width: @bp-control-split) {
            &-left {
                float: left;
            }
            &-right {
                float: right;
                margin-top: 0;
            }
        }
        
        input + label, 
        button {
            display: inline-block;
            vertical-align: middle;
            margin: 0 2px;
            padding: (@control-spacing / 2) @control-spacing;
            
            transition: background .3s ease;
            border-radius: 3px;
            cursor: pointer;

            svg {
                width: 18px;
                height: 18px;
                display: block;
                fill: currentColor;
                transition: fill .3s ease;
            }
        }
        input + label,
        .inverted:checked + label {
            color: @control-color-inactive;
        }
        button, 
        .inverted + label,
        input:checked + label {
            color: @control-color;
        }
        button {
            border: 0;
            background: transparent;
            overflow: hidden;
        }
        
        // Specificity for overriding .inverted
        button:focus,
        button:hover,
        [type="checkbox"]:focus + label,
        [type="checkbox"] + label:hover {
            background: @control-bg-hover;
            color: @control-color-hover;
        }
        button:focus,
        input:focus + label {
            outline: 0;
        }
        .icon-exit-fullscreen,
        .icon-muted,
        .icon-captions-on {
            display: none;
        }
        .player-time {
            display: inline-block;
            vertical-align: middle;
            margin-left: @control-spacing;
            color: @control-color;
            font-weight: 600;
            font-size: @font-size-small;
            .font-smoothing();
        }

        // Media duration hidden on small screens
        .player-time + .player-time {
            display: none;

            @media (min-width: @bp-control-split) {
                display: inline-block;
            }

            // Add a slash in before
            &::before {
                content: "\2044";
                margin-right: @control-spacing;
                color: darken(@control-color, 30%);
            }
        }
    }

    // Tooltips
    &-tooltip {
        visibility: hidden;
        position: absolute;
        z-index: 2;
        bottom: 100%;
        margin-bottom: @tooltip-padding;
        padding: @tooltip-padding (@tooltip-padding * 1.5);

        opacity: 0;
        background: @tooltip-bg;
        border-radius: @tooltip-radius;
        color: @tooltip-color;
        font-size: @font-size-small;
        line-height: 1.5;
        font-weight: 600;

        transform: translate(-50%, (@tooltip-padding * 3));
        transition: transform .2s .2s ease, opacity .2s .2s ease;

        &::after {
            content: "";
            display: block;
            position: absolute;
            left: 50%;
            bottom: -@tooltip-arrow-size;
            margin-left: -@tooltip-arrow-size;
            width: 0;
            height: 0;
            transition: inherit;
            border-style: solid;
            border-width: @tooltip-arrow-size @tooltip-arrow-size 0 @tooltip-arrow-size;
            border-color: @controls-bg transparent transparent;
        }
    }
    label:hover .player-tooltip,
    input:focus + label .player-tooltip, 
    button:hover .player-tooltip,
    button:focus .player-tooltip {
        visibility: visible;
        opacity: 1;
        transform: translate(-50%, 0);
    }
    label:hover .player-tooltip,
    button:hover .player-tooltip {
        z-index: 3;
    }

    // Player progress
    // <progress> element
    &-progress {
        position: absolute;
        bottom: 100%;
        left: 0;
        right: 0;
        width: 100%;
        height: @control-spacing;
        background: @progress-bg;

        &-buffer[value],
        &-played[value],
        &-seek[type=range] {
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: @control-spacing;
            margin: 0;
            padding: 0;
            vertical-align: top;

            -webkit-appearance: none;
            -moz-appearance: none;
            border: none;
            background: transparent;
        }
        &-buffer[value],
        &-played[value] {   
            &::-webkit-progress-bar {
                background: transparent;
            }

            // Inherit from currentColor;
            &::-webkit-progress-value {
                background: currentColor;
            }
            &::-moz-progress-bar {
                background: currentColor;
            }
        }
        &-played[value] {
            z-index: 2;
            color: @progress-playing-bg;
        }
        &-buffer[value] {
            color: @progress-buffered-bg;
        }

        // Seek control
        // <input[type='range']> element
        // Specificity is for bootstrap compatibility
        &-seek[type=range] {
            z-index: 4;
            cursor: pointer;
            outline: 0;

            // Webkit
            &::-webkit-slider-runnable-track {
                .seek-track();
            }
            &::-webkit-slider-thumb {
                -webkit-appearance: none;
                .seek-thumb();
            }

            // Mozilla
            &::-moz-range-track {
                .seek-track();
            }
            &::-moz-range-thumb {
                -moz-appearance: none;
                .seek-thumb();
            }
            
            // Microsoft
            &::-ms-track {
                color: transparent;
                .seek-track();
            }
            &::-ms-fill-lower,
            &::-ms-fill-upper {
                .seek-track();
            }
            &::-ms-thumb {
                .seek-thumb();
            }

            &:focus {
                outline: 0;
            }
            &::-moz-focus-outer {
                border: 0;
            }
        }
    }

    // Loading state
    &.loading .player-progress-buffer {
        animation: progress 1s linear infinite;
        background-size: @progress-loading-size @progress-loading-size;
        background-repeat: repeat-x;
        background-color: @progress-buffered-bg;
        background-image: linear-gradient(
            -45deg, 
            @progress-loading-bg 25%, 
            transparent 25%, 
            transparent 50%, 
            @progress-loading-bg 50%, 
            @progress-loading-bg 75%,
            transparent 75%, 
            transparent);
        color: transparent;
    }

    // States
    &-controls [data-player='pause'],
    &.playing .player-controls [data-player='play'] {
        display: none;
    }
    &.playing .player-controls [data-player='pause'] {
        display: inline-block;
    }

    // Volume control
    // <input[type='range']> element
    // Specificity is for bootstrap compatibility
    &-volume[type=range] {
        display: inline-block;
        vertical-align: middle;
        -webkit-appearance: none;
        -moz-appearance: none;
        width: 100px;
        margin: 0 @control-spacing 0 0;
        padding: 0;     
        cursor: pointer;
        background: none;
        
        // Webkit
        &::-webkit-slider-runnable-track {
            .volume-track();
        }
        &::-webkit-slider-thumb {
            -webkit-appearance: none;
            margin-top: -((@volume-thumb-height - @volume-track-height) / 2);
            .volume-thumb();
        }

        // Mozilla
        &::-moz-range-track {
            .volume-track();
        }
        &::-moz-range-thumb {
            .volume-thumb();
        }
        
        // Microsoft
        &::-ms-track {
            height: @volume-track-height;
            background: transparent;
            border-color: transparent;
            border-width: ((@volume-thumb-height - @volume-track-height) / 2) 0;
            color: transparent;
        }
        &::-ms-fill-lower,
        &::-ms-fill-upper {
            .volume-track();
        }
        &::-ms-thumb {
            .volume-thumb();
        }

        &:focus {
            outline: 0;

            &::-webkit-slider-thumb {
                background: @volume-thumb-bg-focus;
            }
            &::-moz-range-thumb {
                background: @volume-thumb-bg-focus;
            }
            &::-ms-thumb {
                background: @volume-thumb-bg-focus;
            }
        }
    }

    // Hide sound controls on iOS
    // It's not supported to change volume using JavaScript:
    // https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/Device-SpecificConsiderations/Device-SpecificConsiderations.html
    &.ios &-volume,
    &.ios [data-player='mute'],
    &.ios [data-player='mute'] + label,
    &-audio.ios &-controls-right {
        display: none;
    }
    // Center buttons so it looks less odd
    &-audio.ios &-controls-left {
        float: none;
    }

    // Audio specific styles
    // Position the progress within the container
    &-audio .player-controls {
        padding-top: (@control-spacing * 2);
    }
    &-audio .player-progress {
        bottom: auto;
        top: 0;
        background: @off-white;
    }

    // Full screen mode
    &-fullscreen,
    &.fullscreen-active {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        height: 100%;
        width: 100%;
        z-index: 10000000;
        background: #000;

        video {
            height: 100%;
        }
        .player-video-wrapper {
            height: 100%;
            width: 100%;

            .player-captions {
                top: auto;
                bottom: 90px;

                @media (min-width: @bp-control-split) and (max-width: (@bp-captions-large - 1)) {
                    bottom: 60px;
                }
                @media (min-width: @bp-captions-large) {
                    bottom: 80px;
                }
            }
        }
        .player-controls {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
        }

        // Hide controls when playing in full screen
        &.fullscreen-hide-controls.playing .player-controls {
            transform: translateY(100%) translateY(@control-spacing / 2);
            transition: transform .3s 1s ease;

            &.hover {
                transform: translateY(0);
                transition-delay: 0;
            }
        }
    }

    // Change icons on state change
    &.fullscreen-active .icon-exit-fullscreen,
    &.muted .player-controls .icon-muted,
    &.captions-active .player-controls .icon-captions-on {
        display: block;

        & + svg {
            display: none;
        }
    }

    // Some options are hidden by default
    [data-player='captions'],
    [data-player='captions'] + label,
    [data-player='fullscreen'],
    [data-player='fullscreen'] + label {
        display: none;
    }
    &.captions-enabled [data-player='captions'],
    &.captions-enabled [data-player='captions'] + label,
    &.fullscreen-enabled [data-player='fullscreen'],
    &.fullscreen-enabled [data-player='fullscreen'] + label {
        display: inline-block;
    }
}