---
const { selectedCourseLabel, courses } = Astro.props

const years = await Astro.glob('../pages/archivio/*/index.md')
const yearLabels = years.map(module => module.file.split('/').at(-2)).toSorted()

/** Get the current year using the latest year label */
const currentYear = yearLabels.at(-1)

/** Get the selected year using the courses array */
const selectedYear = courses
    .find(module => module.file.includes('index.md'))
    .file.split('/')
    .at(-2)

const selectedYearIndex = yearLabels.indexOf(selectedYear)
const previousYear = selectedYearIndex > 0 ? yearLabels[selectedYearIndex - 1] : null
const nextYear = selectedYearIndex < yearLabels.length - 1 ? yearLabels[selectedYearIndex + 1] : null

const isCurrentYear = currentYear == selectedYear
const coursesWithoutIndex = courses.filter(m => !m.file.includes('index.md'))

function yearLink(year: string) {
    return year === currentYear ? '/' : `/archivio/${year}`
}
---

<header>
    <h1>
        <a href="/">Tutorato Matematica</a>
    </h1>
    <nav>
        <!-- <ul>
            {
                yearLabels.slice(0, -1).map(year => (
                    <li class:list={{ active: year === selectedYear }}>
                        <a href={`/archivio/${year}`}>{year}</a>
                    </li>
                ))
            }
            <li class:list={{ active: currentYear === selectedYear }}>
                <a href={'/'}>{currentYear}</a>
            </li>
        </ul> -->
        <div class="year-navigation">
            <!-- <div class="mobile-only"></div> -->
            <div class="row desktop-only">
                <a class:list={['link', { disabled: previousYear === null }]} href={yearLink(previousYear)}>
                    <div class="gg-chevron-left"></div>
                </a>
                <a href={currentYear === selectedYear ? '/' : `/archivio/${selectedYear}`}>{selectedYear}</a>
                <a class:list={['link', { disabled: nextYear === null }]} href={yearLink(nextYear)}>
                    <div class="gg-chevron-right"></div>
                </a>
            </div>
        </div>
        <div class="course-navigation">
            {
                coursesWithoutIndex.map(course => (
                    <a
                        class:list={{
                            active: selectedCourseLabel === course.file.split('/').at(-1),
                            last: course.frontmatter['header-position'] === 'last',
                        }}
                        href={isCurrentYear ? '/' + course.url.split('/').at(-1) : course.url}
                    >
                        {course.frontmatter.title}
                    </a>
                ))
            }
        </div>
    </nav>
</header>