package frankenphp

// #include "frankenphp.h"
import "C"
import (
	"github.com/dunglas/frankenphp/internal/state"
)

// EXPERIMENTAL: ThreadDebugState prints the state of a single PHP thread - debugging purposes only
type ThreadDebugState struct {
	Index                    int
	Name                     string
	State                    string
	IsWaiting                bool
	IsBusy                   bool
	WaitingSinceMilliseconds int64
	CurrentURI               string
	CurrentMethod            string
	RequestStartedAt         int64
	RequestCount             int64
	MemoryUsage              int64
}

// EXPERIMENTAL: FrankenPHPDebugState prints the state of all PHP threads - debugging purposes only
type FrankenPHPDebugState struct {
	ThreadDebugStates   []ThreadDebugState
	ReservedThreadCount int
}

// EXPERIMENTAL: DebugState prints the state of all PHP threads - debugging purposes only
func DebugState() FrankenPHPDebugState {
	fullState := FrankenPHPDebugState{
		ThreadDebugStates:   make([]ThreadDebugState, 0, len(phpThreads)),
		ReservedThreadCount: 0,
	}
	for _, thread := range phpThreads {
		if thread.state.Is(state.Reserved) {
			fullState.ReservedThreadCount++
			continue
		}
		fullState.ThreadDebugStates = append(fullState.ThreadDebugStates, threadDebugState(thread))
	}

	return fullState
}

// threadDebugState creates a small jsonable status message for debugging purposes
func threadDebugState(thread *phpThread) ThreadDebugState {
	isBusy := !thread.state.IsInWaitingState()

	s := ThreadDebugState{
		Index:                    thread.threadIndex,
		Name:                     thread.name(),
		State:                    thread.state.Name(),
		IsWaiting:                thread.state.IsInWaitingState(),
		IsBusy:                   isBusy,
		WaitingSinceMilliseconds: thread.state.WaitTime(),
	}

	s.RequestCount = thread.requestCount.Load()
	s.MemoryUsage = int64(C.frankenphp_get_thread_memory_usage(C.uintptr_t(thread.threadIndex)))

	if !isBusy {
		return s
	}

	thread.handlerMu.RLock()
	handler := thread.handler
	thread.handlerMu.RUnlock()

	if handler == nil {
		return s
	}

	thread.contextMu.RLock()
	defer thread.contextMu.RUnlock()

	fc := handler.frankenPHPContext()
	if fc == nil || fc.request == nil || fc.responseWriter == nil {
		return s
	}

	if fc.originalRequest == nil {
		s.CurrentURI = fc.requestURI
		s.CurrentMethod = fc.request.Method
	} else {
		s.CurrentURI = fc.originalRequest.URL.RequestURI()
		s.CurrentMethod = fc.originalRequest.Method
	}

	if !fc.startedAt.IsZero() {
		s.RequestStartedAt = fc.startedAt.UnixMilli()
	}

	return s
}