// Example 6: Flowchart Diagram with CeTZ

#import "@preview/cetz:0.4.2"

#set text(font: "Libertinus Serif", size: 11pt)
#set page(width: auto, height: auto, margin: 0.5cm)

#cetz.canvas({
  import cetz.draw: *

  let start-fill = blue.lighten(70%)
  let process-fill = green.lighten(70%)
  let decision-fill = orange.lighten(70%)
  let end-fill = red.lighten(70%)

  // Start node
  rect((0, 4), (3, 5.5), fill: start-fill, stroke: blue)
  content((1.5, 4.75), [Start], anchor: "center")

  // First process
  rect((5, 4), (9, 5.5), fill: process-fill, stroke: green)
  content((7, 4.75), [Load Data], anchor: "center")

  // Decision
  rect((5, 1.5), (9, 3.5), fill: decision-fill, stroke: orange, radius: 0.3)
  content((7, 2.5), [Valid?], anchor: "center")

  // Process 2
  rect((11, 4), (15, 5.5), fill: process-fill, stroke: green)
  content((13, 4.75), [Process], anchor: "center")

  // Error handler
  rect((11, 0), (15, 1.5), fill: end-fill, stroke: red)
  content((13, 0.75), [Error Log], anchor: "center")

  // End node
  rect((16, 4), (19, 5.5), fill: start-fill, stroke: blue)
  content((17.5, 4.75), [End], anchor: "center")

  // Arrows
  line((3, 4.75), (5, 4.75), mark: (end: ">"), stroke: black + 1pt)
  line((9, 4.75), (9, 2.5), mark: (end: ">"), stroke: black + 1pt)
  line((9, 2.5), (11, 4.75), mark: (end: ">"), stroke: black + 1pt)
  line((7, 1.5), (7, 0.75), mark: (end: ">"), stroke: black + 1pt)
  line((7, 0.75), (11, 0.75), mark: (end: ">"), stroke: black + 1pt)
  line((11, 0.75), (11, 4.75), mark: (end: ">"), stroke: black + 1pt)
  line((15, 4.75), (16, 4.75), mark: (end: ">"), stroke: black + 1pt)

  // Labels
  content((4, 5), [Initialize], anchor: "south")
  content((9.5, 2.5), [Yes], anchor: "west")
  content((7, 1.8), [No], anchor: "south")
})