#lang r7rs

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;;                                Constants                                  ;;
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;; All configuration constants for the Pac-Man game. Prevents magic numbers
;; throughout the codebase and makes the game easily configurable.

(define-library (pacman-project constants)
  (import (scheme base))
  (export ;; Window
          window-width-px
          window-height-px

          ;; Maze grid
          cell-size-px
          maze-offset-y
          maze-wall-shrink

          ;; Cell types
          cell-type-coin
          cell-type-wall
          cell-type-empty
          cell-type-key
          cell-type-door

          ;; Coin rendering
          coin-inset
          coin-size

          ;; Sprites
          sprite-scale-pacman
          sprite-scale-key
          sprite-scale-key-ui

          ;; Movement
          pacman-speed-ms

          ;; Animation
          animation-interval-ms

          ;; Score
          points-per-coin

          ;; Time limit
          start-time-seconds
          ms-per-second
          time-bonus-per-coin

          ;; Key placement
          max-placement-attempts

          ;; Rotation angles
          rotation-right
          rotation-left
          rotation-up
          rotation-down

          ;; Colors
          color-background
          color-wall
          color-door
          color-coin
          color-text
          color-title
          color-header-bg
          color-game-over
          color-pause-bg
          color-pause-text

          ;; UI layout
          header-height
          header-title-size
          header-title-x
          header-title-y
          score-label-size
          score-label-x
          score-label-y
          score-value-size
          score-value-x
          score-value-y
          key-ui-x
          key-ui-y
          sidebar-x
          sidebar-width
          time-label-size
          time-label-x
          time-label-y
          time-value-size
          time-value-x
          time-value-y
          game-over-text-size
          game-over-text-x
          game-over-text-y
          pause-text-size
          pause-text-x
          pause-text-y)

  (begin

    ;; Window dimensions
    (define window-width-px 1000)
    (define window-height-px 830)

    ;; Maze grid configuration
    (define cell-size-px 24)
    (define maze-offset-y 97)
    (define maze-wall-shrink 6)

    ;; Cell type encoding for the maze grid
    (define cell-type-coin 0)
    (define cell-type-wall 1)
    (define cell-type-empty 2)
    (define cell-type-key 3)
    (define cell-type-door 4)

    ;; Coin rendering
    (define coin-inset 9)
    (define coin-size 6)

    ;; Sprite scale factors
    (define sprite-scale-pacman 1.5)
    (define sprite-scale-key 1.5)
    (define sprite-scale-key-ui 3)

    ;; Movement speed: time between automatic movement ticks
    (define pacman-speed-ms 200)

    ;; Animation timing
    (define animation-interval-ms 100)

    ;; Score configuration
    (define points-per-coin 10)

    ;; Time limit configuration
    (define start-time-seconds 60)
    (define ms-per-second 1000)
    (define time-bonus-per-coin 1)

    ;; Key placement
    (define max-placement-attempts 1000)

    ;; Rotation angles (degrees)
    (define rotation-right 0)
    (define rotation-left 180)
    (define rotation-up 90)
    (define rotation-down -90)

    ;; Colors — arcade-style palette
    (define color-background "black")
    (define color-wall "#2121DE")
    (define color-door "#FFB8FF")
    (define color-coin "#FFB851")
    (define color-text "white")
    (define color-title "#FFFF00")
    (define color-header-bg "#111111")
    (define color-game-over "#FF0000")
    (define color-pause-bg "black")
    (define color-pause-text "#FF0000")

    ;; UI layout — header bar at the top
    (define header-height 90)
    (define header-title-size 36)
    (define header-title-x 250)
    (define header-title-y 25)

    ;; Score display (left side of header)
    (define score-label-size 20)
    (define score-label-x 20)
    (define score-label-y 25)
    (define score-value-size 32)
    (define score-value-x 20)
    (define score-value-y 50)

    ;; Key UI indicator position
    (define key-ui-x 600)
    (define key-ui-y 30)

    ;; Sidebar (right of maze)
    (define sidebar-x 672)
    (define sidebar-width 4)

    ;; Time display (right sidebar area)
    (define time-label-size 20)
    (define time-label-x 700)
    (define time-label-y 200)
    (define time-value-size 40)
    (define time-value-x 710)
    (define time-value-y 240)

    ;; Game over overlay
    (define game-over-text-size 48)
    (define game-over-text-x 180)
    (define game-over-text-y 380)

    ;; Pause overlay
    (define pause-text-size 48)
    (define pause-text-x 200)
    (define pause-text-y 400)))