package game

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"thehouseoficarus/internal/net"
	"thehouseoficarus/internal/player"
	"gopkg.in/yaml.v3"
)

type HelpDef struct {
	Name     string `yaml:"name"`
	Category string `yaml:"category"`
	Content  string `yaml:"description"`
}

type cmdEntry struct {
	Name string
	Type string
	Desc string
}

var commandList = []cmdEntry{
	{"alias", "Instant", "Create command shortcuts"},
	{"attack / kill", "Active", "Attack a mob"},
	{"burn", "Active", "Start a fire"},
	{"chop / cut", "Active", "Chop trees (Woodcutting)"},
	{"color / colors", "Instant", "Customize display colors"},
	{"colortable", "Instant", "Display color reference chart"},
	{"cook", "Active", "Cook raw food on a fire or range"},
	{"description / desc", "Instant", "Set your character description"},
	{"drop", "Active", "Drop items to the ground"},
	{"eat", "Free", "Eat food to restore hitpoints"},
	{"equipment / eq", "Instant", "Show equipped items"},
	{"exits", "Instant", "List available exits"},
	{"fish", "Active", "Fish at fishing spots (Fishing)"},
	{"get / take / pick", "Active", "Pick up items from the ground"},
	{"help", "Instant", "Show help topics"},
	{"inventory / i / inv", "Instant", "Show your inventory"},
	{"look / l", "Instant", "Look around or examine things"},
	{"map", "Instant", "Display an ASCII map of the area"},
	{"mine", "Active", "Mine rocks (Mining)"},
	{"north / south / east / west / up / down", "Active", "Move in a direction"},
	{"option / options", "Instant", "View or change settings"},
	{"prompt", "Instant", "Set custom command prompt"},
	{"pull / push", "Active", "Toggle levers and switches"},
	{"queued", "Instant", "Show pending tick actions"},
	{"quit", "Active", "Rest and disconnect"},
	{"remove / unwear / unwield", "Free", "Unequip items"},
	{"say", "Instant", "Chat with players in your room"},
	{"score / sc", "Instant", "View your stats and skills"},
	{"search", "Active", "Search items for loot"},
	{"stoke", "Active", "Add logs to a fire"},
	{"style", "Instant", "Change combat style"},
	{"talk / speak / ask", "Active", "Talk to NPCs"},
	{"unalias", "Instant", "Remove command shortcuts"},
	{"use", "Active", "Use an object (crafting)"},
	{"walk", "Active", "Pathfind to a room or multi-step walk"},
	{"wear / wield", "Free", "Equip items"},
}

func LoadHelp(dataDir string) ([]HelpDef, error) {
	dir := filepath.Join(dataDir, "help")
	entries, err := os.ReadDir(dir)
	if err != nil {
		return nil, err
	}

	var helps []HelpDef
	for _, entry := range entries {
		if entry.IsDir() || filepath.Ext(entry.Name()) != ".yaml" {
			continue
		}
		data, err := os.ReadFile(filepath.Join(dir, entry.Name()))
		if err != nil {
			continue
		}
		var h HelpDef
		if err := yaml.Unmarshal(data, &h); err != nil {
			continue
		}
		helps = append(helps, h)
	}
	return helps, nil
}

func (g *Game) doHelp(sess *net.Session, topic string) {
	if topic == "" {
		unicode := true
		if p, _ := sess.Player.(*player.Player); p != nil {
			unicode = p.OptionBool("unicode")
		}

		sess.WriteLine("")
		t := &Table{
			Title:   "Commands",
			Columns: []string{"Command", "Type", "Description"},
		}
		for _, c := range commandList {
			t.Rows = append(t.Rows, []string{c.Name, c.Type, c.Desc})
		}
		for _, line := range t.Render(unicode) {
			sess.WriteLine(line)
		}
		sess.WriteLine("")
		sess.WriteLine("Command types: Instant (runs immediately), Free (queued before active),")
		sess.WriteLine("Active (replaces current action, queued per tick).")
		sess.WriteLine("")
		sess.WriteLine("Use 'help <command>' for detailed usage of a specific command.")
		sess.WriteLine("Use 'option' to view and change settings, 'color' to customize colors.")
		return
	}

	helps, err := LoadHelp(g.dataDir)
	if err != nil || len(helps) == 0 {
		sess.WriteLine("No help available.")
		return
	}

	topic = strings.ToLower(topic)
	for _, h := range helps {
		if strings.ToLower(h.Name) == topic {
			sess.WriteLine(fmt.Sprintf("\n  %s", h.Content))
			return
		}
	}
	sess.WriteLine(fmt.Sprintf("No help found for '%s'.", topic))
}

func firstLine(s string) string {
	if idx := strings.Index(s, "\n"); idx >= 0 {
		return s[:idx]
	}
	return s
}