package asmc

import (
	"git.urbach.dev/cli/q/src/asm"
	"git.urbach.dev/cli/q/src/x86"
)

func (c *compiler) jump(x asm.Instruction) {
	switch x.Mnemonic {
	case asm.JE:
		c.code = x86.Jump8IfEqual(c.code, 0x00)
	case asm.JNE:
		c.code = x86.Jump8IfNotEqual(c.code, 0x00)
	case asm.JG:
		c.code = x86.Jump8IfGreater(c.code, 0x00)
	case asm.JGE:
		c.code = x86.Jump8IfGreaterOrEqual(c.code, 0x00)
	case asm.JL:
		c.code = x86.Jump8IfLess(c.code, 0x00)
	case asm.JLE:
		c.code = x86.Jump8IfLessOrEqual(c.code, 0x00)
	case asm.JUMP:
		c.code = x86.Jump8(c.code, 0x00)
	}

	size := 1
	label := x.Data.(*asm.Label)

	pointer := &pointer{
		Position: Address(len(c.code) - size),
		OpSize:   1,
		Size:     uint8(size),
	}

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

		if !exists {
			panic("unknown jump label")
		}

		distance := destination - (pointer.Position + Address(pointer.Size))
		return distance
	}

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