package game

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

	"gopkg.in/yaml.v3"
	"thehouseoficarus/internal/behavior"
	"thehouseoficarus/internal/color"
	"thehouseoficarus/internal/net"
	"thehouseoficarus/internal/ui"
)

type HelpDef struct {
	Name     string   `yaml:"name"`
	Aliases  []string `yaml:"aliases"`
	Related  []string `yaml:"related"`
	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"},
	{"aps", "Active", "Auto-travel using Agility"},
	{"attack / kill", "Active", "Attack a mob"},
	{"autotrigger / auto", "Instant", "Set a module to auto-trigger"},
	{"bank", "Active", "Open bank interface"},
	{"browse / list", "Instant", "Browse a shop's stock; at a casino table, list every bet accepted now"},
	{"burn", "Active", "Start a fire"},
	{"buy", "Instant", "Buy from a shop"},
	{"chop / cut", "Active", "Chop trees (Woodcutting)"},
	{"clean", "Free", "Clean grimy herbs (Pharmacy)"},
	{"color / colors", "Instant", "Customize display colors"},
	{"colortable", "Instant", "Display color reference chart"},
	{"construct / make", "Active", "Build furniture (Construction)"},
	{"cook", "Active", "Cook raw food on a fire or range"},
	{"craft", "Active", "Craft jewelry (Crafting)"},
	{"cure", "Active", "Cure diseased crops (Farming)"},
	{"description / desc", "Instant", "Set your character description"},
	{"drink", "Free", "Drink a potion"},
	{"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)"},
	{"fletch", "Free", "Fletch logs into bows (Fletching)"},
	{"get / take / pick", "Active", "Pick up items from the ground"},
	{"global", "Instant", "Chat with everyone on the server"},
	{"harvest", "Active", "Harvest a grown farming patch"},
	{"help", "Instant", "Show help topics"},
	{"hide / safespot", "Active", "Hide in a safespot"},
	{"home / recall", "Instant", "Return to your home room"},
	{"id / identify", "Active", "Identify herbs (Pharmacy)"},
	{"inspect", "Instant", "Inspect a mob, object, or item"},
	{"inventory / i / inv", "Instant", "Show your inventory"},
	{"jack / jackin", "Active", "Jack into a terminal (Hacking)"},
	{"look / l", "Instant", "Look around or examine things"},
	{"map", "Instant", "Display an ASCII map of the area"},
	{"play", "Active", "Join a game; play bj / play bac; optional amount and target"},
	{"table / status", "Instant", "Redisplay table state; table rules / table help for details"},
	{"rules", "Instant", "Help page for the casino game you're playing (one per house edition)"},
	{"watch", "Instant", "Watch detailed table action; watch off to stop"},
	{"sitout", "Instant", "Sit out future table rounds; bet to rejoin"},
	{"bet / rebet", "Active", "Repeat a wager, or bet <amount> [target]; min/max accepted"},
	{"autobet / autospin", "Active", "Automatically repeat a casino wager"},
	{"spin", "Active", "Spin the current casino wager"},
	{"hit / stand / double / split", "Active", "Play blackjack (shortcuts: h / st / dd / sp)"},
	{"insurance / decline / surrender", "Active", "Answer an insurance offer or surrender a blackjack hand"},
	{"mine", "Active", "Mine rocks (Mining)"},
	{"mix", "Active", "Mix potions (Pharmacy)"},
	{"mods / modlist", "Instant", "List available science modules"},
	{"north / south / east / west / up / down", "Active", "Move in a direction"},
	{"option / options", "Instant", "View or change settings"},
	{"plant", "Active", "Plant seeds in a farming patch"},
	{"prompt", "Instant", "Set custom command prompt"},
	{"pull / push", "Active", "Interact with objects"},
	{"queued", "Instant", "Show pending tick actions"},
	{"quit", "Active", "Rest and disconnect (\"quit now\" forfeits a mid-game bet)"},
	{"rake", "Active", "Rake a farming patch"},
	{"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"},
	{"sell", "Instant", "Sell to a shop"},
	{"skills / sk", "Instant", "Show your skill levels"},
	{"smelt", "Active", "Smelt ore into bars (Smithing)"},
	{"smith", "Active", "Smith bars into items (Smithing)"},
	{"sneak", "Instant", "Toggle sneak mode"},
	{"stats", "Instant", "Show your combat stats"},
	{"steal", "Active", "Steal from mobs (Thieving)"},
	{"stop", "Instant", "Stop the current action"},
	{"stoke", "Active", "Add logs to a fire"},
	{"style", "Instant", "Change combat style"},
	{"symbol", "Instant", "Set custom map symbol for current room"},
	{"talk / speak / ask", "Active", "Talk to mobs"},
	{"task", "Instant", "Show your current task"},
	{"tech", "Instant", "Toggle technology abilities"},
	{"trigger", "Active", "Trigger a science module"},
	{"unalias", "Instant", "Remove command shortcuts"},
	{"unhide / unsafespot", "Active", "Leave a safespot"},
	{"use", "Active", "Use an object (crafting)"},
	{"verbs / commands", "Instant", "List every command you can use"},
	{"walk", "Active", "Pathfind to a room or multi-step walk"},
	{"water", "Active", "Water crops (Farming)"},
	{"wear / wield", "Free", "Equip items"},
	{"who", "Instant", "List everyone online and their combat level"},
}

func LoadHelp(dataDir string) ([]HelpDef, error) {
	dir := filepath.Join(dataDir, "help")
	var helps []HelpDef
	behavior.WalkYAMLDir(dir, func(path, id string, data []byte) error {
		h := parseHelpDef(data)
		if h == nil {
			return nil
		}
		helps = append(helps, *h)
		return nil
	})
	return helps, nil
}

// helpRaw mirrors the canonical help schema and is also used by data
// validation to flag unknown fields.
type helpRaw struct {
	Name        string   `yaml:"name"`
	Aliases     []string `yaml:"aliases"`
	Related     []string `yaml:"related"`
	Category    string   `yaml:"category"`
	Description string   `yaml:"description"`
}

// parseHelpDef unmarshals a help definition. Returns nil for files that are
// not help topics (no name at all).
func parseHelpDef(data []byte) *HelpDef {
	var raw helpRaw
	if err := yaml.Unmarshal(data, &raw); err != nil {
		return nil
	}
	if raw.Name == "" {
		return nil
	}
	return &HelpDef{
		Name:     raw.Name,
		Aliases:  raw.Aliases,
		Related:  raw.Related,
		Category: raw.Category,
		Content:  raw.Description,
	}
}

func (g *Game) doHelp(sess *net.Session, topic string) {
	if topic == "" {
		unicode := true
		wrapWidth := 0
		if p := sess.Player; p != nil {
			unicode = p.OptionBool("unicode")
			wrapWidth = p.OptionInt("wrap_width")
		}

		sess.WriteLine("")
		t := &ui.Table{
			Title:   "Commands",
			Columns: []string{"Command", "Type", "Description"},
		}
		commandSpec := g.resolveColor(sess, "command")
		for _, c := range commandList {
			name := color.Render(g.colorMode(sess), commandSpec, c.Name)
			t.Rows = append(t.Rows, []string{name, c.Type, c.Desc})
		}
		for _, line := range t.Render(unicode, wrapWidth) {
			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 'help casino' for quick guides to casino bets, odds and payouts.")
		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(strings.TrimSpace(topic))
	for _, h := range helps {
		if matchesHelpTopic(h, topic) {
			sess.WriteLine(fmt.Sprintf("  %s", h.Content))
			if len(h.Related) > 0 {
				sess.WriteLine("")
				sess.WriteLine(fmt.Sprintf("  Related topics: %s", strings.Join(h.Related, ", ")))
			}
			return
		}
	}

	// No dedicated help page. If it's a known command, at least show its
	// summary from the command table instead of a dead end.
	for _, c := range commandList {
		for _, name := range strings.Split(c.Name, " / ") {
			if strings.ToLower(strings.TrimSpace(name)) == topic {
				sess.WriteLine(fmt.Sprintf("  %s - %s", c.Name, c.Desc))
				sess.WriteLine("")
				sess.WriteLine("  (No detailed help page for this command yet.)")
				return
			}
		}
	}
	sess.WriteLine(fmt.Sprintf("No help found for '%s'.", topic))
}

// matchesHelpTopic reports whether the help entry answers the given topic,
// matching its name or any declared alias (case-insensitive).
func matchesHelpTopic(h HelpDef, topic string) bool {
	if strings.EqualFold(h.Name, topic) {
		return true
	}
	for _, a := range h.Aliases {
		if strings.EqualFold(strings.TrimSpace(a), topic) {
			return true
		}
	}
	return false
}

func (g *Game) executeHelp(sess *net.Session, args []string, rawInput string) {
	if len(args) == 0 {
		g.doHelp(sess, "")
	} else {
		g.doHelp(sess, strings.Join(args, " "))
	}
}