package routes

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"

	"github.com/go-chi/chi/v5"

	"github.com/felt-app/felt/internal/seating"
	"github.com/felt-app/felt/internal/server/middleware"
)

// TableHandler handles table, seating, balancing, and break table API routes.
type TableHandler struct {
	tables     *seating.TableService
	balance    *seating.BalanceEngine
	breakTable *seating.BreakTableService
	blueprints *seating.BlueprintService
}

// NewTableHandler creates a new table route handler.
func NewTableHandler(
	tables *seating.TableService,
	balance *seating.BalanceEngine,
	breakTable *seating.BreakTableService,
	blueprints *seating.BlueprintService,
) *TableHandler {
	return &TableHandler{
		tables:     tables,
		balance:    balance,
		breakTable: breakTable,
		blueprints: blueprints,
	}
}

// RegisterRoutes registers table and seating routes on the given router.
func (h *TableHandler) RegisterRoutes(r chi.Router) {
	// Tournament-scoped routes
	r.Route("/tournaments/{id}", func(r chi.Router) {
		// Read-only (any authenticated user)
		r.Get("/tables", h.handleGetTables)
		r.Get("/balance", h.handleCheckBalance)

		// Mutation routes (admin or floor)
		r.Group(func(r chi.Router) {
			r.Use(middleware.RequireRole(middleware.RoleFloor))

			// Table management
			r.Post("/tables", h.handleCreateTable)
			r.Post("/tables/from-blueprint", h.handleCreateFromBlueprint)
			r.Post("/tables/save-blueprint", h.handleSaveBlueprint)
			r.Put("/tables/{tableId}", h.handleUpdateTable)
			r.Delete("/tables/{tableId}", h.handleDeactivateTable)

			// Seating
			r.Post("/players/{playerId}/auto-seat", h.handleAutoSeat)
			r.Post("/players/{playerId}/seat", h.handleAssignSeat)
			r.Post("/seats/swap", h.handleSwapSeats)

			// Balancing
			r.Post("/balance/suggest", h.handleSuggestMoves)
			r.Post("/balance/suggestions/{suggId}/accept", h.handleAcceptSuggestion)
			r.Post("/balance/suggestions/{suggId}/cancel", h.handleCancelSuggestion)

			// Break Table
			r.Post("/tables/{tableId}/break", h.handleBreakTable)

			// Dealer Button
			r.Post("/tables/{tableId}/button", h.handleSetButton)
			r.Post("/tables/{tableId}/button/advance", h.handleAdvanceButton)

			// Hand-for-Hand
			r.Post("/hand-for-hand", h.handleSetHandForHand)
			r.Post("/tables/{tableId}/hand-complete", h.handleTableHandComplete)
		})
	})

	// Venue-level blueprint routes
	r.Route("/blueprints", func(r chi.Router) {
		r.Get("/", h.handleListBlueprints)
		r.Get("/{id}", h.handleGetBlueprint)
		r.Group(func(r chi.Router) {
			r.Use(middleware.RequireRole(middleware.RoleAdmin))
			r.Post("/", h.handleCreateBlueprint)
			r.Put("/{id}", h.handleUpdateBlueprint)
			r.Delete("/{id}", h.handleDeleteBlueprint)
		})
	})
}

// ---------- Table Handlers ----------

func (h *TableHandler) handleGetTables(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	tables, err := h.tables.GetTables(r.Context(), tournamentID)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, tables)
}

type createTableRequest struct {
	Name      string `json:"name"`
	SeatCount int    `json:"seat_count"`
}

func (h *TableHandler) handleCreateTable(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")

	var req createTableRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	table, err := h.tables.CreateTable(r.Context(), tournamentID, req.Name, req.SeatCount)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusCreated, table)
}

type fromBlueprintRequest struct {
	BlueprintID int `json:"blueprint_id"`
}

func (h *TableHandler) handleCreateFromBlueprint(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")

	var req fromBlueprintRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	tables, err := h.blueprints.CreateTablesFromBlueprint(r.Context(), h.tables.DB(), tournamentID, req.BlueprintID)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusCreated, tables)
}

func (h *TableHandler) handleUpdateTable(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	tableID, err := strconv.Atoi(chi.URLParam(r, "tableId"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid table id")
		return
	}

	var req createTableRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	if err := h.tables.UpdateTable(r.Context(), tournamentID, tableID, req.Name, req.SeatCount); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "updated"})
}

func (h *TableHandler) handleDeactivateTable(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	tableID, err := strconv.Atoi(chi.URLParam(r, "tableId"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid table id")
		return
	}

	if err := h.tables.DeactivateTable(r.Context(), tournamentID, tableID); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "deactivated"})
}

// ---------- Seating Handlers ----------

func (h *TableHandler) handleAutoSeat(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	playerID := chi.URLParam(r, "playerId")

	assignment, err := h.tables.AutoAssignSeat(r.Context(), tournamentID, playerID)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, assignment)
}

type assignSeatRequest struct {
	TableID      int `json:"table_id"`
	SeatPosition int `json:"seat_position"`
}

func (h *TableHandler) handleAssignSeat(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	playerID := chi.URLParam(r, "playerId")

	var req assignSeatRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	if err := h.tables.AssignSeat(r.Context(), tournamentID, playerID, req.TableID, req.SeatPosition); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "seated"})
}

type swapSeatsRequest struct {
	Player1ID string `json:"player1_id"`
	Player2ID string `json:"player2_id"`
}

func (h *TableHandler) handleSwapSeats(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")

	var req swapSeatsRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	if err := h.tables.SwapSeats(r.Context(), tournamentID, req.Player1ID, req.Player2ID); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "swapped"})
}

// ---------- Balance Handlers ----------

func (h *TableHandler) handleCheckBalance(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	status, err := h.balance.CheckBalance(r.Context(), tournamentID)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, status)
}

func (h *TableHandler) handleSuggestMoves(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	suggestions, err := h.balance.SuggestMoves(r.Context(), tournamentID)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]interface{}{
		"suggestions": suggestions,
	})
}

type acceptSuggestionRequest struct {
	FromSeat int `json:"from_seat"`
	ToSeat   int `json:"to_seat"`
}

func (h *TableHandler) handleAcceptSuggestion(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	suggID, err := strconv.Atoi(chi.URLParam(r, "suggId"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid suggestion id")
		return
	}

	var req acceptSuggestionRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	if err := h.balance.AcceptSuggestion(r.Context(), tournamentID, suggID, req.FromSeat, req.ToSeat); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "accepted"})
}

func (h *TableHandler) handleCancelSuggestion(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	suggID, err := strconv.Atoi(chi.URLParam(r, "suggId"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid suggestion id")
		return
	}

	if err := h.balance.CancelSuggestion(r.Context(), tournamentID, suggID); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "cancelled"})
}

// ---------- Break Table Handler ----------

func (h *TableHandler) handleBreakTable(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	tableID, err := strconv.Atoi(chi.URLParam(r, "tableId"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid table id")
		return
	}

	result, err := h.breakTable.BreakTable(r.Context(), tournamentID, tableID)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, result)
}

// ---------- Dealer Button Handlers ----------

type setButtonRequest struct {
	Position int `json:"position"`
}

func (h *TableHandler) handleSetButton(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	tableID, err := strconv.Atoi(chi.URLParam(r, "tableId"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid table id")
		return
	}

	var req setButtonRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	if err := h.tables.SetDealerButton(r.Context(), tournamentID, tableID, req.Position); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "button_set"})
}

func (h *TableHandler) handleAdvanceButton(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	tableID, err := strconv.Atoi(chi.URLParam(r, "tableId"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid table id")
		return
	}

	if err := h.tables.AdvanceDealerButton(r.Context(), tournamentID, tableID); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "button_advanced"})
}

// ---------- Hand-for-Hand Handlers ----------

type handForHandRequest struct {
	Enabled bool `json:"enabled"`
}

func (h *TableHandler) handleSetHandForHand(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")

	var req handForHandRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	if err := h.tables.SetHandForHand(r.Context(), tournamentID, req.Enabled); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{
		"status": fmt.Sprintf("hand_for_hand_%s", boolStr(req.Enabled)),
	})
}

func (h *TableHandler) handleTableHandComplete(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")
	tableID, err := strconv.Atoi(chi.URLParam(r, "tableId"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid table id")
		return
	}

	if err := h.tables.TableHandComplete(r.Context(), tournamentID, tableID); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "hand_complete"})
}

// ---------- Blueprint Handlers ----------

func (h *TableHandler) handleListBlueprints(w http.ResponseWriter, r *http.Request) {
	blueprints, err := h.blueprints.ListBlueprints(r.Context())
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, blueprints)
}

func (h *TableHandler) handleGetBlueprint(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(chi.URLParam(r, "id"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid blueprint id")
		return
	}

	bp, err := h.blueprints.GetBlueprint(r.Context(), id)
	if err != nil {
		writeError(w, http.StatusNotFound, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, bp)
}

type createBlueprintRequest struct {
	Name         string                       `json:"name"`
	TableConfigs []seating.BlueprintTableConfig `json:"table_configs"`
}

func (h *TableHandler) handleCreateBlueprint(w http.ResponseWriter, r *http.Request) {
	var req createBlueprintRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	bp, err := h.blueprints.CreateBlueprint(r.Context(), req.Name, req.TableConfigs)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusCreated, bp)
}

func (h *TableHandler) handleUpdateBlueprint(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(chi.URLParam(r, "id"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid blueprint id")
		return
	}

	var req createBlueprintRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	bp := seating.Blueprint{
		ID:           id,
		Name:         req.Name,
		TableConfigs: req.TableConfigs,
	}
	if err := h.blueprints.UpdateBlueprint(r.Context(), bp); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "updated"})
}

func (h *TableHandler) handleDeleteBlueprint(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(chi.URLParam(r, "id"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "invalid blueprint id")
		return
	}

	if err := h.blueprints.DeleteBlueprint(r.Context(), id); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "deleted"})
}

type saveBlueprintRequest struct {
	Name string `json:"name"`
}

func (h *TableHandler) handleSaveBlueprint(w http.ResponseWriter, r *http.Request) {
	tournamentID := chi.URLParam(r, "id")

	var req saveBlueprintRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
		return
	}

	bp, err := h.blueprints.SaveBlueprintFromTournament(r.Context(), h.tables.DB(), tournamentID, req.Name)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	writeJSON(w, http.StatusCreated, bp)
}

// boolStr returns "enabled" or "disabled" for a bool value.
func boolStr(b bool) string {
	if b {
		return "enabled"
	}
	return "disabled"
}