package game

import "fmt"

// weapons.c — weapon initialization and naming. The throwing half
// (missile, do_motion, hit_monster) arrives with the combat phase.

const noWeapon = -1

// initWeaps is the weapons.c init_dam[] table.
var initWeaps = [MaxWeapons]struct {
	dam    string // damage when wielded
	hrl    string // damage when thrown
	launch int    // launching weapon
	flags  ObjFlags
}{
	{"2x4", "1x3", noWeapon, 0},                // Mace
	{"3x4", "1x2", noWeapon, 0},                // Long sword
	{"1x1", "1x1", noWeapon, 0},                // Bow
	{"1x1", "2x3", Bow, IsMany | IsMissl},      // Arrow
	{"1x6", "1x4", noWeapon, IsMissl},          // Dagger
	{"4x4", "1x2", noWeapon, 0},                // 2h sword
	{"1x1", "1x3", noWeapon, IsMany | IsMissl}, // Dart
	{"1x2", "2x4", noWeapon, IsMany | IsMissl}, // Shuriken
	{"2x3", "1x6", noWeapon, IsMissl},          // Spear
}

// initWeapon sets up a new weapon (weapons.c init_weapon).
func (g *RogueGame) initWeapon(weap *Object, which int) {
	iwp := &initWeaps[which]
	weap.Type = Weapon
	weap.Which = which
	weap.Damage = iwp.dam
	weap.HurlDmg = iwp.hrl
	weap.Launch = iwp.launch
	weap.Flags = iwp.flags
	weap.HPlus = 0
	weap.DPlus = 0
	if which == Dagger {
		weap.Count = g.rnd(4) + 2
		weap.Group = g.Items.Group
		g.Items.Group++
	} else if weap.Flags.Has(IsMany) {
		weap.Count = g.rnd(8) + 8
		weap.Group = g.Items.Group
		g.Items.Group++
	} else {
		weap.Count = 1
		weap.Group = 0
	}
}

// num formats a hit/damage or armor bonus string (weapons.c num).
func num(n1, n2 int, typ byte) string {
	out := fmt.Sprintf("%+d", n1)
	if typ == Weapon {
		out += fmt.Sprintf(",%+d", n2)
	}
	return out
}

// fallpos picks a random empty position around (pos) for a dropped item
// (weapons.c fallpos).
func (g *RogueGame) fallpos(pos Coord) (Coord, bool) {
	var newpos Coord
	cnt := 0
	for y := pos.Y - 1; y <= pos.Y+1; y++ {
		for x := pos.X - 1; x <= pos.X+1; x++ {
			// check to make certain the spot is empty, if it is, put the
			// object there, set it in the level list and re-draw the room
			// if he can see it
			if (y == g.Player.Pos.Y && x == g.Player.Pos.X) ||
				y < 0 || x < 0 {
				continue
			}
			ch := g.Level.Char(y, x)
			if ch == Floor || ch == Passage {
				if cnt++; g.rnd(cnt) == 0 {
					newpos.Y = y
					newpos.X = x
				}
			}
		}
	}
	return newpos, cnt != 0
}