package core

import (
	"bytes"
	"fmt"

	"git.akyoto.dev/cli/q/src/asm"
	"git.akyoto.dev/go/color/ansi"
)

// PrintInstructions shows the assembly instructions.
func (f *Function) PrintInstructions() {
	ansi.Dim.Println("╭──────────────────────────────────────────────────────────────────────────────╮")

	if len(f.Input) > 0 {
		for i, input := range f.Input {
			ansi.Dim.Printf("│ %-44s%-32s", input.Name, f.CPU.Input[i])
			ansi.Dim.Print(" │\n")
		}

		ansi.Dim.Println("├──────────────────────────────────────────────────────────────────────────────┤")
	}

	for i, x := range f.Assembler.Instructions {
		ansi.Dim.Print("│ ")

		switch x.Mnemonic {
		case asm.LABEL:
			ansi.Yellow.Printf("%-44s", x.Data.String()+":")

		case asm.COMMENT:
			ansi.Dim.Printf("%-44s", x.Data.String())

		default:
			ansi.Green.Printf("%-12s", x.Mnemonic.String())

			if x.Data != nil {
				fmt.Printf("%-32s", x.Data.String())
			} else {
				fmt.Printf("%-32s", "")
			}
		}

		registers := bytes.Buffer{}
		used := f.RegisterHistory[i]

		for _, reg := range f.CPU.All {
			if used&(1<<reg) != 0 {
				registers.WriteString("● ")
			} else {
				registers.WriteString("· ")
			}
		}

		ansi.Dim.Print(registers.String())
		ansi.Dim.Print(" │\n")
	}

	ansi.Dim.Println("╰──────────────────────────────────────────────────────────────────────────────╯")
}