/**
 * This is based on https://github.com/jfcherng/php-diff/blob/6.10.2/example/diff-table.scss
 *
 * It's been converted by performing these steps:
 *  - npm install less-plugin-sass2less --save-dev
 *  - ./node_modules/.bin/sass2less -c /usr/share/icinga-php/vendor/vendor/jfcherng/php-diff/example \
 *    diff-table.scss > /usr/share/icinga-php/vendor/asset/css/vendor/diff-table.less
 *  - `@diff-text-color: invert(@diff-bg-color)` though had to be changed to `@diff-text-color: black`.
 *    (`@diff-text-color: spin(@diff-bg-color, 180)` didn't work)
 */

@diff-bg-color: #fff;
@diff-text-color: black;

@diff-bg-color-ins-base: #8e8;
@diff-bg-color-del-base: #e88;
@diff-bg-color-rep-base: #fbdb65;

@diff-op-highlight-ratio: 90%;
@diff-op-normal-ratio: 25%;

// emphasized colors for detailed inline difference
@diff-bg-color-ins-highlight: mix(@diff-bg-color-ins-base, @diff-bg-color, @diff-op-highlight-ratio);
@diff-bg-color-del-highlight: mix(@diff-bg-color-del-base, @diff-bg-color, @diff-op-highlight-ratio);

// colors for operation rows
@diff-bg-color-ins: mix(@diff-bg-color-ins-base, @diff-bg-color, @diff-op-normal-ratio);
@diff-bg-color-del: mix(@diff-bg-color-del-base, @diff-bg-color, @diff-op-normal-ratio);
@diff-bg-color-rep: mix(@diff-bg-color-rep-base, @diff-bg-color, @diff-op-normal-ratio);

@diff-table-head-color: mix(@diff-bg-color, @diff-text-color, 65%);
@diff-table-sidebar-color: mix(@diff-bg-color, @diff-text-color, 80%);
@diff-border-color: @diff-text-color;

// color for the nonexistent block
// for example, there are a deleted line that has no corresponding one
@diff-bg-color-none-block: mix(@diff-bg-color, @diff-table-sidebar-color, 80%);
@diff-bg-color-none-block-alternative: mix(@diff-bg-color, @diff-table-sidebar-color, 55%);

.diff-wrapper.diff {
  background: repeating-linear-gradient(
    -45deg,
    @diff-bg-color-none-block,
    @diff-bg-color-none-block 0.5em,
    @diff-bg-color-none-block-alternative 0.5em,
    @diff-bg-color-none-block-alternative 1em
  );
  border-collapse: collapse;
  border-spacing: 0;
  border: 1px solid @diff-border-color;
  color: @diff-text-color;
  empty-cells: show;
  font-family: monospace;
  font-size: 13px;
  width: 100%;
  word-break: break-all;

  th {
    font-weight: 700;
  }

  td {
    vertical-align: baseline;
  }

  td,
  th {
    border-collapse: separate;
    border: none;
    padding: 1px 2px;
    background: @diff-bg-color;

    // make empty cell has height
    &:empty:after {
      content: " ";
      visibility: hidden;
    }

    a {
      color: #000;
      cursor: inherit;
      pointer-events: none;
    }
  }

  thead th {
    background: @diff-table-head-color;
    border-bottom: 1px solid @diff-border-color;
    padding: 4px;
    text-align: left;
  }

  tbody {
    &.skipped {
      border-top: 1px solid @diff-border-color;

      td,
      th {
        display: none;
      }
    }

    th {
      background: @diff-table-sidebar-color;
      border-right: 1px solid @diff-border-color;
      text-align: right;
      vertical-align: top;
      width: 4em;

      &.sign {
        background: @diff-bg-color;
        border-right: none;
        padding: 1px 0;
        text-align: center;
        width: 1em;

        &.del {
          background: @diff-bg-color-del;
        }

        &.ins {
          background: @diff-bg-color-ins;
        }
      }
    }
  }

  &.diff-html {
    white-space: pre-wrap;

    &.diff-combined {
      .change.change-rep {
        .rep {
          // fixes https://github.com/jfcherng/php-diff/issues/34#issuecomment-671404456
          white-space: normal;
        }
      }
    }

    .change {
      &.change-eq {
        .old,
        .new {
          background: @diff-bg-color;
        }
      }

      .old {
        background: @diff-bg-color-del;
      }

      .new {
        background: @diff-bg-color-ins;
      }

      .rep {
        background: @diff-bg-color-rep;
      }

      .old,
      .new,
      .rep {
        &.none {
          background: transparent;
          cursor: not-allowed;
        }
      }

      ins,
      del {
        font-weight: bold;
        text-decoration: none;
      }

      ins {
        background: @diff-bg-color-ins-highlight;
      }

      del {
        background: @diff-bg-color-del-highlight;
      }
    }
  }
}