package asmc

import (
	"fmt"

	"git.urbach.dev/cli/q/src/arm"
	"git.urbach.dev/cli/q/src/asm"
)

func (c *compiler) jumpARM(x asm.Instruction) {
	label := c.assembler.Param.Label[x.Index]
	mnemonic := x.Mnemonic
	position := Address(len(c.code))

	pointer := &pointer{
		Position: position,
		Size:     4,
	}

	c.append(arm.Nop())

	pointer.Resolve = func() Address {
		destination, exists := c.codeLabels[label.Name]

		if !exists {
			panic(fmt.Sprintf("unknown jump label %s", label.Name))
		}

		distance := (int(destination) - int(position)) / 4

		switch mnemonic {
		case asm.JE:
			return arm.JumpIfEqual(distance)
		case asm.JNE:
			return arm.JumpIfNotEqual(distance)
		case asm.JG:
			return arm.JumpIfGreater(distance)
		case asm.JGE:
			return arm.JumpIfGreaterOrEqual(distance)
		case asm.JL:
			return arm.JumpIfLess(distance)
		case asm.JLE:
			return arm.JumpIfLessOrEqual(distance)
		case asm.JUMP:
			return arm.Jump(distance)
		default:
			panic("not implemented")
		}
	}

	c.codePointers = append(c.codePointers, pointer)
}