All files / web/src/app/api/create/calendar/utils typstGenerator.ts

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interface TypstMonthlyConfig {
  month: number
  year: number
  paperSize: 'us-letter' | 'a4' | 'a3' | 'tabloid'
  daysInMonth: number
}

interface TypstDailyConfig {
  month: number
  year: number
  paperSize: 'us-letter' | 'a4' | 'a3' | 'tabloid'
  daysInMonth: number
}

const MONTH_NAMES = [
  'January',
  'February',
  'March',
  'April',
  'May',
  'June',
  'July',
  'August',
  'September',
  'October',
  'November',
  'December',
]

export function getDaysInMonth(year: number, month: number): number {
  return new Date(year, month, 0).getDate()
}

function getFirstDayOfWeek(year: number, month: number): number {
  return new Date(year, month - 1, 1).getDay() // 0 = Sunday
}

function getDayOfWeek(year: number, month: number, day: number): string {
  const date = new Date(year, month - 1, day)
  return date.toLocaleDateString('en-US', { weekday: 'long' })
}

type PaperSize = 'us-letter' | 'a4' | 'a3' | 'tabloid'

interface PaperConfig {
  typstName: string
  marginX: string
  marginY: string
}

function getPaperConfig(size: string): PaperConfig {
  const configs: Record<PaperSize, PaperConfig> = {
    // Tight margins to maximize space for calendar grid
    'us-letter': { typstName: 'us-letter', marginX: '0.5in', marginY: '0.5in' },
    // A4 is slightly taller/narrower than US Letter - adjust margins proportionally
    a4: { typstName: 'a4', marginX: '1.3cm', marginY: '1.3cm' },
    // A3 is 2x area of A4 - can use same margins but will scale content larger
    a3: { typstName: 'a3', marginX: '1.5cm', marginY: '1.5cm' },
    // Tabloid (11" × 17") is larger - can use more margin
    tabloid: { typstName: 'us-tabloid', marginX: '0.75in', marginY: '0.75in' },
  }
  return configs[size as PaperSize] || configs['us-letter']
}

export function generateMonthlyTypst(config: TypstMonthlyConfig): string {
  const { paperSize } = config
  const paperConfig = getPaperConfig(paperSize)

  // Single-page design: use one composite SVG that scales to fit
  // This prevents overflow - Typst will scale the image to fit available space
  return `#set page(
  paper: "${paperConfig.typstName}",
  margin: (x: ${paperConfig.marginX}, y: ${paperConfig.marginY}),
)

// Composite calendar SVG - scales to fit page (prevents multi-page overflow)
#align(center + horizon)[
  #image("calendar.svg", width: 100%, fit: "contain")
]
`
}

export function generateDailyTypst(config: TypstDailyConfig): string {
  const { month, year, paperSize, daysInMonth } = config
  const paperConfig = getPaperConfig(paperSize)
  const monthName = MONTH_NAMES[month - 1]

  let pages = ''

  for (let day = 1; day <= daysInMonth; day++) {
    const dayOfWeek = getDayOfWeek(year, month, day)

    pages += `
#page(
  paper: "${paperConfig.typstName}",
  margin: (x: ${paperConfig.marginX}, y: ${paperConfig.marginY}),
)[
  #set text(font: "Georgia")

  // Decorative borders
  #rect(
    width: 100%,
    height: 100%,
    stroke: (paint: rgb("#2563eb"), thickness: 3pt),
    radius: 8pt,
    inset: 0pt,
  )[
    #rect(
      width: 100%,
      height: 100%,
      stroke: (paint: rgb("#2563eb"), thickness: 1pt),
      radius: 4pt,
      inset: 10pt,
    )[
      #v(10pt)

      // Header section with background
      #rect(
        width: 100%,
        height: 90pt,
        fill: rgb("#eff6ff"),
        stroke: (paint: rgb("#2563eb"), thickness: 2pt),
        radius: 6pt,
      )[
        #align(center)[
          #v(15pt)
          #text(size: 32pt, weight: "bold", fill: rgb("#1e40af"), tracking: 2pt)[
            ${monthName.toUpperCase()}
          ]
          #v(5pt)
          #image("year.svg", width: 15%)
        ]
      ]

      #v(15pt)

      // Day of week (large and prominent)
      #align(center)[
        #text(size: 28pt, weight: "bold", fill: rgb("#1e3a8a"))[
          ${dayOfWeek}
        ]
      ]

      #v(10pt)

      // Day abacus (main focus, large)
      #align(center)[
        #image("day-${day}.svg", width: 45%)
      ]

      #v(10pt)

      // Full date
      #align(center)[
        #text(size: 18pt, weight: 500, fill: rgb("#475569"))[
          ${monthName} ${day}, ${year}
        ]
      ]

      #v(1fr)

      // Notes section with decorative box
      #rect(
        width: 100%,
        height: 90pt,
        fill: rgb("#fefce8"),
        stroke: (paint: rgb("#ca8a04"), thickness: 2pt),
        radius: 4pt,
      )[
        #v(8pt)
        #text(size: 14pt, weight: "bold", fill: rgb("#854d0e"))[
          #h(10pt) Notes:
        ]
        #v(8pt)
        #line(length: 95%, stroke: (paint: rgb("#ca8a04"), thickness: 1pt))
        #v(8pt)
        #line(length: 95%, stroke: (paint: rgb("#ca8a04"), thickness: 1pt))
        #v(8pt)
        #line(length: 95%, stroke: (paint: rgb("#ca8a04"), thickness: 1pt))
      ]

      #v(10pt)
    ]
  ]
]

${day < daysInMonth ? '' : ''}`

    if (day < daysInMonth) {
      pages += '\n'
    }
  }

  return pages
}