package api

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

	"crypto-miner-server/internal/alerts"
	"crypto-miner-server/internal/db"
	"crypto-miner-server/internal/pool"

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

type FleetHandler struct {
	db          *db.Database
	ws          *WSHub
	ai          *AIHandler
	pools       *pool.Manager
	alerts      *alerts.Evaluator
	defaultPool pool.Config
}

func NewFleetHandler(database *db.Database, ws *WSHub, ai *AIHandler, pools *pool.Manager, evaluator *alerts.Evaluator, defaultPool pool.Config) *FleetHandler {
	return &FleetHandler{
		db:          database,
		ws:          ws,
		ai:          ai,
		pools:       pools,
		alerts:      evaluator,
		defaultPool: defaultPool,
	}
}

func (f *FleetHandler) GetAlerts(w http.ResponseWriter, r *http.Request) {
	if f.alerts == nil {
		writeJSON(w, []alerts.AlertEvent{})
		return
	}
	writeJSON(w, f.alerts.ActiveAlerts())
}

func (f *FleetHandler) GetPoolStatus(w http.ResponseWriter, r *http.Request) {
	if f.pools == nil {
		writeJSON(w, []pool.PoolStatus{})
		return
	}
	writeJSON(w, f.pools.ListStatus())
}

func (f *FleetHandler) GetAIActivity(w http.ResponseWriter, r *http.Request) {
	if f.ai == nil {
		writeJSON(w, []AIActivityEntry{})
		return
	}
	writeJSON(w, f.ai.ActivitySnapshot())
}

func (f *FleetHandler) GetEarningsEstimate(w http.ResponseWriter, r *http.Request) {
	hashrate := parseFloatQuery(r, "hashrate", 0)
	writeJSON(w, EstimateXMRPerDay(hashrate))
}

func (f *FleetHandler) GetAgentLog(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	if f.ws == nil {
		http.Error(w, "websocket hub unavailable", http.StatusServiceUnavailable)
		return
	}
	if r.URL.Query().Get("refresh") == "1" {
		_ = f.ws.SendAgentCommand(id, "get_log", map[string]interface{}{"tail_lines": 300})
	}
	writeJSON(w, map[string]interface{}{
		"agent_id": id,
		"content":  f.ws.GetAgentLog(id),
	})
}

type agentCommandRequest struct {
	Action    string `json:"action"`
	TailLines int    `json:"tail_lines,omitempty"`
	Command   string `json:"command,omitempty"`
	Path      string `json:"path,omitempty"`
	Data      string `json:"data,omitempty"`
}

func (f *FleetHandler) PostAgentCommand(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	var req agentCommandRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, "invalid command", http.StatusBadRequest)
		return
	}
	if req.Action == "" {
		http.Error(w, "action is required", http.StatusBadRequest)
		return
	}
	if f.ws == nil {
		http.Error(w, "websocket hub unavailable", http.StatusServiceUnavailable)
		return
	}
	args := map[string]interface{}{}
	if req.TailLines > 0 {
		args["tail_lines"] = req.TailLines
	}
	if req.Command != "" {
		args["command"] = req.Command
	}
	if req.Path != "" {
		args["path"] = req.Path
	}
	if req.Data != "" {
		args["data"] = req.Data
	}

	if id == "all" {
		if f.ws.connectedAgentCount() == 0 {
			writeJSON(w, map[string]interface{}{
				"success":  false,
				"error":    "no connected agents",
				"agent_id": id,
				"action":   req.Action,
			})
			return
		}
		f.ws.BroadcastAgentCommand(req.Action, args)
	} else {
		if err := f.ws.SendAgentCommand(id, req.Action, args); err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
	}
	writeJSON(w, map[string]interface{}{
		"success":  true,
		"agent_id": id,
		"action":   req.Action,
	})
}

// EstimateXMRPerDay uses approximate network hashrate (~3 GH/s) and daily emission (~432 XMR).
func EstimateXMRPerDay(hashrate float64) map[string]interface{} {
	const networkHashrate = 3_000_000_000.0
	const dailyEmissionXMR = 432.0
	xmr := 0.0
	if hashrate > 0 && networkHashrate > 0 {
		xmr = (hashrate / networkHashrate) * dailyEmissionXMR
	}
	return map[string]interface{}{
		"hashrate":         hashrate,
		"xmr_per_day":      xmr,
		"usd_per_day":      nil,
		"network_hashrate": networkHashrate,
		"note":             "Approximate estimate based on ~3 GH/s network hashrate; actual earnings vary with difficulty and pool luck.",
	}
}

func parseFloatQuery(r *http.Request, key string, def float64) float64 {
	v := r.URL.Query().Get(key)
	if v == "" {
		return def
	}
	f, err := strconv.ParseFloat(v, 64)
	if err != nil {
		return def
	}
	return f
}