package admin

import (
	"net/http"
	"os"
	"sort"
	"strings"

	"gopkg.in/yaml.v3"

	"thehouseoficarus/internal/color"
	"thehouseoficarus/internal/config"
)

// colorCategory describes one editable color category: its config key, a
// human-friendly label, and a UI grouping.
type colorCategory struct {
	Name  string `json:"name"`
	Label string `json:"label"`
	Group string `json:"group"`
}

// colorSegment is one piece of preview text tagged with the category whose
// color spec should paint it. A nil/empty category means plain (uncolored).
type colorSegment struct {
	T string `json:"t"` // text
	C string `json:"c"` // category name, "" = plain
}

// colorLine groups segments into one rendered line.
type colorLine struct {
	Segments []colorSegment `json:"segments"`
}

// colorSection is a titled block of example output.
type colorSection struct {
	Title string      `json:"title"`
	Lines []colorLine `json:"lines"`
}

// colorCategories is the curated, grouped, ordered master list mirroring the
// keys produced by config.DefaultColors(). Editing here is the single source
// of truth for the admin color themer's left-side list.
var colorCategories = []colorCategory{
	// Room / look
	{Name: "room_name", Label: "Room Name", Group: "Room"},
	{Name: "room_number", Label: "Room Number", Group: "Room"},
	{Name: "room_desc", Label: "Room Description", Group: "Room"},
	{Name: "exit_direction", Label: "Exit Direction", Group: "Room"},
	{Name: "exit_name", Label: "Exit Name", Group: "Room"},
	{Name: "mob", Label: "Mob", Group: "Room"},
	{Name: "protected_mob", Label: "Protected Mob", Group: "Room"},
	{Name: "player_name", Label: "Player Name", Group: "Room"},
	{Name: "item", Label: "Item", Group: "Room"},
	{Name: "dim", Label: "Dim / Brackets", Group: "Room"},

	// Movement
	{Name: "direction", Label: "Move Direction", Group: "Movement"},

	// Combat
	{Name: "damage_dealt", Label: "Damage Dealt", Group: "Combat"},
	{Name: "damage_taken", Label: "Damage Taken", Group: "Combat"},
	{Name: "damage", Label: "Damage (alt key)", Group: "Combat"},
	{Name: "miss", Label: "Miss", Group: "Combat"},
	{Name: "death", Label: "Death", Group: "Combat"},
	{Name: "victory", Label: "Victory", Group: "Combat"},
	{Name: "warning", Label: "Warning", Group: "Combat"},
	{Name: "error", Label: "Error", Group: "Combat"},
	{Name: "science_mod", Label: "Science Mod", Group: "Combat"},

	// XP / level
	{Name: "xp", Label: "XP Drop", Group: "XP / Level"},
	{Name: "level_up", Label: "Level Up", Group: "XP / Level"},

	// Pickups / economy
	{Name: "credits_pickup", Label: "Credits Pickup", Group: "Pickups / Economy"},
	{Name: "chips_pickup", Label: "Chips Pickup", Group: "Pickups / Economy"},

	// Chat / dialog
	{Name: "say", Label: "Say", Group: "Chat / Dialog"},
	{Name: "global", Label: "Global", Group: "Chat / Dialog"},
	{Name: "broadcast", Label: "Broadcast", Group: "Chat / Dialog"},
	{Name: "dialog", Label: "Dialog", Group: "Chat / Dialog"},
	{Name: "dialog_options", Label: "Dialog Options", Group: "Chat / Dialog"},

	// Drops / consume / fire
	{Name: "drop_message", Label: "Drop Message", Group: "Drops / Consume / Fire"},
	{Name: "eat_food", Label: "Eat Food", Group: "Drops / Consume / Fire"},
	{Name: "fire", Label: "Fire", Group: "Drops / Consume / Fire"},

	// Tick / status
	{Name: "visual_tick", Label: "Visual Tick", Group: "Tick / Status"},
	{Name: "visual_first_tick", Label: "Visual First Tick", Group: "Tick / Status"},

	// Tech / farm
	{Name: "battery", Label: "Battery", Group: "Tech / Farm"},
	{Name: "tech_depleted", Label: "Tech Depleted", Group: "Tech / Farm"},
	{Name: "farm_grow", Label: "Farm Grow", Group: "Tech / Farm"},
	{Name: "farm_disease", Label: "Farm Disease", Group: "Tech / Farm"},

	// Assassin / map / safespot
	{Name: "assassin_task", Label: "Assassin Task", Group: "Assassin / Map / Safespot"},
	{Name: "map_at", Label: "Map At (you)", Group: "Assassin / Map / Safespot"},
	{Name: "map_blocked", Label: "Map Blocked", Group: "Assassin / Map / Safespot"},
	{Name: "map_course", Label: "Map Course", Group: "Assassin / Map / Safespot"},
	{Name: "safespot_alert", Label: "Safespot Alert", Group: "Assassin / Map / Safespot"},

	// System
	{Name: "sequence", Label: "Sequence (trigger)", Group: "System"},
}

// knownColor returns true if name is one of the editable categories.
func knownColor(name string) bool {
	for _, c := range colorCategories {
		if c.Name == name {
			return true
		}
	}
	return false
}

// seg is a small constructor helper for the inline preview builder.
func seg(t, cat string) colorSegment {
	return colorSegment{T: t, C: cat}
}

// ln builds a line from a sequence of segments.
func ln(segs ...colorSegment) colorLine {
	return colorLine{Segments: segs}
}

// txt builds a plain (uncolored) line.
func txt(s string) colorLine {
	return colorLine{Segments: []colorSegment{{T: s}}}
}

// buildPreview constructs the example output covering every color category.
// Text patterns match real in-game output (room looks, combat, pickups, chat,
// etc.) so admins see exactly what each color key paints.
func buildPreview() []colorSection {
	var sections []colorSection

	// --- A full room "look" ----------------------------------------------
	sections = append(sections, colorSection{
		Title: "Room Look",
		Lines: []colorLine{
			ln(seg("Test Room", "room_name"),
				seg(" (intro, #2001)", "room_number")),
			txt(""),
			ln(seg("It's a test room", "room_desc")),
			txt(""),
			ln(seg("A tree is here.", "room_desc")),
			txt(""),
			ln(seg("A sentry ", "protected_mob"), seg("(level 4)", ""), seg(" watches the gate.", "")),
			ln(seg("A man ", "mob"), seg("(level 5)", ""), seg(" scribbles something in a small notebook.", "")),
			txt(""),
			ln(seg("Icarus", "player_name"), seg(" is here.", "")),
			txt(""),
			txt("On the ground:"),
			ln(seg("  bones            ", "item"), seg("(reserved for admin 65t)", "dim")),
			ln(seg("  bronze axe", "item")),
			ln(seg("  bucket of water", "item")),
			ln(seg("  10 x chips       ", "item"), seg("(reserved for admin 65t)", "dim")),
			ln(seg("  pot of flour", "item")),
			txt(""),
			txt("Exits:"),
			ln(seg("  ", ""), seg("south", "exit_direction"), seg(" - ", ""), seg("Test Room", "exit_name")),
			ln(seg("  ", ""), seg("east", "exit_direction"), seg("  - ", ""), seg("Processing Station", "exit_name")),
			ln(seg("  ", ""), seg("west", "exit_direction"), seg("  - ", ""), seg("Inside Transport Shuttle", "exit_name")),
			txt(""),
			ln(seg(">", "dim")),
			txt(""),
			ln(seg("> s", "dim")),
			ln(seg("You walk ", ""), seg("south", "direction"), seg(".", "")),
		},
	})

	// --- Combat rounds (matches real output) ------------------------------
	sections = append(sections, colorSection{
		Title: "Combat (two encounters)",
		Lines: []colorLine{
			txt(""),
			ln(seg("> attack man", "dim")),
			txt(""),
			ln(seg("You attack ", ""), seg("the man", "mob"), seg("! Style: accurate (+3 atk)", "")),
			ln(seg("You hit ", ""), seg("the man", "mob"), seg(" for  ", ""),
				seg("\U0001FB38 6 \U0001FB34 damage.   [█░░░░░░░░░] [ 1/7]", "damage_dealt"),
				seg(" (+18xp acc, +6xp hp)", "xp")),
			ln(seg("The man misses you.", "miss")),
			ln(seg("You hit ", ""), seg("the man", "mob"), seg(" for  ", ""),
				seg("\U0001FB38 6 \U0001FB34 damage.   [░░░░░░░░░░] [ 0/7]", "damage_dealt"),
				seg(" (+18xp acc, +6xp hp)", "xp")),
			ln(seg("You have defeated ", ""), seg("the man", "mob"), seg("!", "victory")),
			ln(seg("*** You are now level 12 melee! ***", "level_up")),
			txt(""),
			ln(seg("A scout", "mob"), seg(" hits you for ", ""),
				seg("\U0001FB38 5 \U0001FB34 damage.   [██████░░░░] [22/40]", "damage_taken")),
			ln(seg("A scout's attack is extra effective! Equip ", ""),
				seg("plated vest", "warning"), seg(" for protection.", "")),
			ln(seg("You attack ", ""), seg("a scout", "mob"), seg(" with ", ""), seg("laser cutter", "science_mod"), seg("!", "")),
			ln(seg("You miss a scout.", "miss")),
			ln(seg("Oh dear, you are dead!", "death")),
			txt(""),
			ln(seg("> help!", "dim")),
			ln(seg("Unknown command.", "error")),
			txt(""),
			ln(seg("(", ""), seg("damage", "damage"), seg(" is a config-only alt key, not emitted by the engine)", "")),
		},
	})

	// --- Pickups / economy ------------------------------------------------
	sections = append(sections, colorSection{
		Title: "Pickups & Economy",
		Lines: []colorLine{
			ln(seg("You pick up ", ""), seg("50 credits. (total: 1234)", "credits_pickup")),
			ln(seg("You steal ", ""), seg("25 credits", "credits_pickup"), seg(".", "")),
			ln(seg("Score \u2502 ", ""), seg("12 chips", "chips_pickup")),
		},
	})

	// --- Chat / dialog ----------------------------------------------------
	sections = append(sections, colorSection{
		Title: "Chat & Dialog",
		Lines: []colorLine{
			ln(seg("You say: ", ""), seg("hello there", "say")),
			ln(seg("[Global] ", "global"), seg("Icarus: ", "player_name"), seg("anyone up for a raid?", "global")),
			ln(seg("Icarus", "player_name"), seg(" has slain ", ""),
				seg("a scout", "broadcast"), seg(" (level 5)!", "broadcast")),
			txt(""),
			ln(seg("Guard says: ", ""), seg("\u201cHalt. State your business.\u201d", "dialog")),
			ln(seg("[enter to continue]", "dialog_options")),
			ln(seg("  1. ", "dialog_options"), seg("I'm looking for work.", "dialog")),
			ln(seg("  2. ", "dialog_options"), seg("Just passing through.", "dialog")),
		},
	})

	// --- Drops / consume / fire ------------------------------------------
	sections = append(sections, colorSection{
		Title: "Drops, Consume & Fire",
		Lines: []colorLine{
			ln(seg("The man drops: ", "drop_message"), seg("bones", "item")),
			ln(seg("The man drops: ", "drop_message"),
				seg("10", "credits_pickup"), seg(" x ", ""), seg("chips", "item")),
			ln(seg("You eat the bread. It restores some energy.", "eat_food")),
			ln(seg("You manage to get a fire going!", "fire")),
		},
	})

	// --- Tick / tech / farm ----------------------------------------------
	sections = append(sections, colorSection{
		Title: "Tick, Tech & Farm",
		Lines: []colorLine{
			ln(seg("tick 1", "visual_first_tick")),
			ln(seg("tick 2", "visual_tick")),
			ln(seg("tick 3", "visual_tick")),
			ln(seg("Your battery is depleted! All tech has been disabled.", "tech_depleted")),
			ln(seg("You connect to the charging station. Your battery is fully recharged.", "battery")),
			ln(seg("Your marigold has grown to stage 2/4.", "farm_grow")),
			ln(seg("Your marigold has become diseased!", "farm_disease")),
		},
	})

	// --- Assassin / safespot ---------------------------------------------
	sections = append(sections, colorSection{
		Title: "Assassin & Safespot",
		Lines: []colorLine{
			ln(seg("Your target: 15 slugs. Get to work.", "assassin_task")),
			ln(seg("*** Assassin task complete! ***", "assassin_task"),
				seg(" (+50xp asm)", "xp")),
			ln(seg("  Assassin task: 12 of 15 slugs remaining.", "assassin_task")),
			ln(seg("Your safespot has been compromised!", "safespot_alert")),
			ln(seg("Your divine power prevents death.", "miss")),
		},
	})

	// --- Map (mini map side panel) ---------------------------------------
	sections = append(sections, colorSection{
		Title: "Mini Map",
		Lines: []colorLine{
			ln(seg("╔═════╗", "dim")),
			ln(seg("║", "dim"), seg(" ", ""), seg("░", "map_blocked"), seg("   ", ""), seg("║", "dim")),
			ln(seg("║", "dim"), seg("     ", ""), seg("║", "dim")),
			ln(seg("║", "dim"), seg("■", ""), seg("-", ""), seg("@", "map_at"), seg("-", ""), seg("■", ""), seg("║", "dim")),
			ln(seg("║", "dim"), seg("  ", ""), seg("│", "map_course"), seg("  ", ""), seg("║", "dim")),
			ln(seg("║", "dim"), seg("  ", ""), seg("■", ""), seg("  ", ""), seg("║", "dim")),
			ln(seg("╚═════╝", "dim")),
		},
	})

	// --- Trigger sequence / system ---------------------------------------
	sections = append(sections, colorSection{
		Title: "Triggers & System",
		Lines: []colorLine{
			ln(seg("The ancient console hums to life as you approach.", "sequence")),
			ln(seg("  A holographic display flickers. \u201cWelcome, traveler.\u201d", "sequence")),
		},
	})

	return sections
}

func (s *AdminServer) handleColors(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		s.getColors(w, r)
	case http.MethodPost:
		s.saveColors(w, r)
	default:
		writeJSONError(w, "method not allowed", http.StatusMethodNotAllowed)
	}
}

func (s *AdminServer) getColors(w http.ResponseWriter, _ *http.Request) {
	live := make(map[string]string, len(colorCategories))
	for _, c := range colorCategories {
		if v, ok := s.cfg.DefaultColors[c.Name]; ok {
			live[c.Name] = v
		} else {
			live[c.Name] = ""
		}
	}
	defaults := config.DefaultColors()
	def := make(map[string]string, len(colorCategories))
	for _, c := range colorCategories {
		if v, ok := defaults[c.Name]; ok {
			def[c.Name] = v
		} else {
			def[c.Name] = ""
		}
	}
	writeJSON(w, map[string]any{
		"colors":         live,
		"default_colors": def,
		"categories":     colorCategories,
		"preview":        buildPreview(),
	})
}

func (s *AdminServer) saveColors(w http.ResponseWriter, r *http.Request) {
	var body struct {
		Colors map[string]string `json:"colors"`
	}
	if err := readJSON(r, &body); err != nil {
		writeJSONError(w, "invalid request body", http.StatusBadRequest)
		return
	}

	// Validate every supplied key/spec against the known config grammar.
	for name, val := range body.Colors {
		if !knownColor(name) {
			writeJSONError(w, "unknown color category: "+name, http.StatusBadRequest)
			return
		}
		// "off" or empty is explicitly allowed (NoColor). Anything else must
		// parse to a non-empty ColorSpec whose only unknown we tolerate is none.
		spec := color.Parse(val)
		if strings.TrimSpace(val) != "" && val != "off" && spec.Empty() {
			writeJSONError(w, "invalid color spec for "+name+": "+val, http.StatusBadRequest)
			return
		}
	}

	cur := s.cfg.DefaultColors
	next := make(map[string]string, len(cur)+len(body.Colors))
	for k, v := range cur {
		next[k] = v
	}
	for k, v := range body.Colors {
		next[k] = v
	}
	s.cfg.DefaultColors = next

	if err := s.writeConfigFile(); err != nil {
		writeJSONError(w, "save failed: "+err.Error(), http.StatusInternalServerError)
		return
	}
	writeJSON(w, map[string]any{"ok": true})
}

func (s *AdminServer) handleColorsReset(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSONError(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	s.cfg.DefaultColors = config.DefaultColors()
	if err := s.writeConfigFile(); err != nil {
		writeJSONError(w, "save failed: "+err.Error(), http.StatusInternalServerError)
		return
	}
	// Return the freshly reset live values for the client to reload.
	live := make(map[string]string, len(colorCategories))
	for _, c := range colorCategories {
		if v, ok := s.cfg.DefaultColors[c.Name]; ok {
			live[c.Name] = v
		} else {
			live[c.Name] = ""
		}
	}
	writeJSON(w, map[string]any{"ok": true, "colors": live})
}

// writeConfigFile marshals the entire live *config.Config back to config.yaml,
// overwriting whatever was on disk. A full re-marshal drops the file's manual
// comments but produces a valid, reloadable file with the edited colors.
func (s *AdminServer) writeConfigFile() error {
	_ = backupFile(s.configPath) // best-effort snapshot for safety
	out, err := yaml.Marshal(s.cfg)
	if err != nil {
		return err
	}
	return os.WriteFile(s.configPath, out, 0644)
}

// sortedKeys is a small helper retained in case future code wants a stable
// iteration order over the category names.
func sortedKeys(m map[string]string) []string {
	keys := make([]string, 0, len(m))
	for k := range m {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	return keys
}