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package game
import (
"errors"
"fmt"
"io"
"log"
"math/rand"
"net/http"
"os"
"path"
"strings"
"time"
"gopkg.in/yaml.v3"
)
const (
PROTOCOL string = "http://"
BASE_URL string = "localhost:8000/"
MAP_URL_PART string = "html/build/maps"
DEFAULT_RESSOURCE_GAIN int = 5
DEFAULT_START_DECK string = "3 misc/farmer"
)
type MapYml struct {
Map string `yaml:"map"`
Symbols map[string]string `yaml:"symbols"`
}
type Map struct {
Tiles [][]Tile
symbols map[string]string
RessourceGain int
StartDeckList string
}
func readMap(r io.Reader) (*Map, error) {
data, err := io.ReadAll(r)
if err != nil {
return nil, err
}
return ParseMap(data)
}
func ParseMap(data []byte) (*Map, error) {
mapYml := MapYml{}
err := yaml.Unmarshal(data, &mapYml)
if err != nil {
return nil, err
}
mapYml.Symbols[" "] = "neutral"
m := &Map{[][]Tile{}, mapYml.Symbols, DEFAULT_RESSOURCE_GAIN, DEFAULT_START_DECK}
rows := strings.Split(mapYml.Map, "\n")
for y := 0; y < len(rows); y++ {
m.Tiles = append(m.Tiles, []Tile{})
row := rows[y]
for x := 0; x < len(rows[y]); x++ {
s := string(row[x])
tile, err := NewTileFromString(mapYml.Symbols[s], Position{x, y})
if err != nil {
return nil, err
}
m.Tiles[y] = append(m.Tiles[y], tile)
}
}
m.selectStreets()
return m, nil
}
func (m *Map) selectStreets() {
for y := 0; y < len(m.Tiles); y++ {
for x := 0; x < len(m.Tiles[y]); x++ {
tile := &m.Tiles[y][x]
if tile.Type != TileTypes.Street {
continue
}
connections, left, right, above, below := m.FindStreetConnections(x, y)
// Decide if curve or straight
if connections == 2 && (left || right) && (above || below) {
tile.Raw = "street 2"
}
if connections > 2 {
tile.Raw = fmt.Sprintf("street %d", connections)
}
}
}
}
func (m *Map) FindNeighbours(x, y int) (left, right, above, below *Tile) {
left, right, above, below = nil, nil, nil, nil
if y > 0 {
above = &m.Tiles[y-1][x]
}
if y < len(m.Tiles) {
below = &m.Tiles[y+1][x]
}
if x > 0 {
left = &m.Tiles[y][x-1]
}
if x < len(m.Tiles[y]) {
right = &m.Tiles[y][x+1]
}
return left, right, above, below
}
func (m *Map) FindAnyConnections(x, y int) (connections int, left, right, above, below bool) {
leftT, rightT, aboveT, belowT := m.FindNeighbours(x, y)
connections = 0
if leftT != nil && leftT.Type != TileTypes.Neutral {
left = true
connections += 1
}
if rightT != nil && rightT.Type != TileTypes.Neutral {
right = true
connections += 1
}
if aboveT != nil && aboveT.Type != TileTypes.Neutral {
above = true
connections += 1
}
if belowT != nil && belowT.Type != TileTypes.Neutral {
below = true
connections += 1
}
return
}
func (m *Map) FindStreetConnections(x int, y int) (connections int, left, right, above, below bool) {
leftT, rightT, aboveT, belowT := m.FindNeighbours(x, y)
connections = 0
if leftT != nil && leftT.Type == TileTypes.Street {
left = true
connections += 1
}
if rightT != nil && rightT.Type == TileTypes.Street {
right = true
connections += 1
}
if aboveT != nil && aboveT.Type == TileTypes.Street {
above = true
connections += 1
}
if belowT != nil && belowT.Type == TileTypes.Street {
below = true
connections += 1
}
return
}
func GetMap(name string) (*Map, error) {
url := path.Join(BASE_URL, MAP_URL_PART, name+".yml")
log.Printf("loading map from %s\n", url)
resp, err := http.Get(PROTOCOL + url)
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
return readMap(resp.Body)
}
func LoadMap(file string) (*Map, error) {
f, err := os.Open(file)
if err != nil {
log.Fatal("Opening map ", file, " failed: ", err)
}
defer f.Close()
return readMap(f)
}
func (m *Map) TileAt(p Position) *Tile {
return &m.Tiles[p.Y][p.X]
}
func (m *Map) RandomTile(types []TileType) Position {
candidates := []Position{}
for y := 0; y < len(m.Tiles); y++ {
for x := 0; x < len(m.Tiles[y]); x++ {
candidate := m.Tiles[y][x]
for _, t := range types {
if candidate.Type == t {
candidates = append(candidates, candidate.Position)
break
}
}
}
}
r := rand.New(rand.NewSource(time.Now().UnixNano()))
randIdx := r.Intn(len(candidates))
return candidates[randIdx]
}
func (m *Map) RandomTileFromSymbols(symbols []string) (Position, error) {
types := make([]TileType, 0, len(symbols))
for _, symbol := range symbols {
tileString, ok := m.symbols[symbol]
if !ok {
return INVALID_POSITION(), fmt.Errorf(fmt.Sprintf("symbol %s not in the map symbols %v", symbol, m.symbols))
}
tileType, ok := TileNames[tileString]
if !ok {
return INVALID_POSITION(), errors.New("tile type unknown")
}
types = append(types, tileType)
}
return m.RandomTile(types), nil
}
|
