package sdkserver

import (
	"fmt"
	"gac-hkrpg-go/internal/common"
	"net/http"
	"strconv"
	"strings"
	"time"
)

func apiFakeTimeCommand(w http.ResponseWriter, cmd string) {
	parts := strings.Fields(cmd)
	usage := "Usage: /faketime [status | off | window <begin Unix seconds> <end Unix seconds> | <Unix seconds> | <RFC3339 date with timezone>]. Window mode wraps the game clock at the end; off restores real time. Reopen the guide after the next heartbeat; relogin if it caches schedules."
	var now time.Time
	var err error
	arg := strings.TrimSpace(strings.TrimPrefix(cmd, parts[0]))
	switch strings.ToLower(arg) {
	case "", "status":
		now, err = common.GameTime()
	case "off", "reset", "real":
		now, err = common.SetGameTime(nil)
	default:
		if len(parts) > 1 && strings.EqualFold(parts[1], "window") {
			if len(parts) != 4 {
				err = fmt.Errorf("window requires begin and end Unix seconds")
			} else {
				begin, e1 := strconv.ParseInt(parts[2], 10, 64)
				end, e2 := strconv.ParseInt(parts[3], 10, 64)
				if e1 != nil || e2 != nil || begin < 0 || end > 253402300799 || end <= begin {
					err = fmt.Errorf("invalid window Unix seconds")
				} else {
					now, err = common.SetGameTimeWindow(time.Unix(begin, 0), time.Unix(end, 0))
				}
			}
			break
		}
		var target time.Time
		if seconds, e := strconv.ParseInt(arg, 10, 64); e == nil {
			if seconds < 0 || seconds > 253402300799 {
				err = fmt.Errorf("Unix seconds outside supported calendar range")
			} else {
				target = time.Unix(seconds, 0)
			}
		} else {
			target, err = time.Parse(time.RFC3339, arg)
		}
		if err == nil {
			now, err = common.SetGameTime(&target)
		}
	}
	if err != nil {
		writeJSON(w, map[string]any{"success": false, "output": err.Error() + "\n" + usage})
		return
	}
	state, err := common.ReadGameClock()
	if err != nil {
		writeJSON(w, map[string]any{"success": false, "output": err.Error()})
		return
	}
	writeJSON(w, map[string]any{"success": true, "command": cmd, "game_time": now.UTC().Format(time.RFC3339), "unix_seconds": now.Unix(), "offset_ms": state.OffsetMS, "window_begin_ms": state.WindowBeginMS, "window_end_ms": state.WindowEndMS, "output": fmt.Sprintf("Game time: %s (offset %d ms, window %d..%d ms). %s", now.UTC().Format(time.RFC3339), state.OffsetMS, state.WindowBeginMS, state.WindowEndMS, usage)})
}