// Copyright 2023, Command Line Inc.
// SPDX-License-Identifier: Apache-2.0

// in-memory storage for waveterm server
package sstore

import (
	"log"
	"sync"

	"github.com/wavetermdev/waveterm/wavesrv/pkg/utilfn"
)

// global lock for all memory operations
// memory ops are very fast, so this is not a bottleneck
var MemLock *sync.Mutex = &sync.Mutex{}
var ScreenMemStore map[string]*ScreenMemState = make(map[string]*ScreenMemState) // map of screenid -> ScreenMemState

const (
	ScreenIndicator_None    = ""
	ScreenIndicator_Error   = "error"
	ScreenIndicator_Success = "success"
	ScreenIndicator_Output  = "output"
)

var screenIndicatorLevels map[string]int = map[string]int{
	ScreenIndicator_None:    0,
	ScreenIndicator_Output:  1,
	ScreenIndicator_Success: 2,
	ScreenIndicator_Error:   3,
}

func dumpScreenMemStore() {
	MemLock.Lock()
	defer MemLock.Unlock()
	for k, v := range ScreenMemStore {
		log.Printf("  ScreenMemStore[%s] = %+v\n", k, v)
	}
}

// returns true if i1 > i2
func isIndicatorGreater(i1 string, i2 string) bool {
	return screenIndicatorLevels[i1] > screenIndicatorLevels[i2]
}

type ScreenMemState struct {
	NumRunningCommands int               `json:"numrunningcommands,omitempty"`
	IndicatorType      string            `json:"indicatortype,omitempty"`
	CmdInputText       utilfn.StrWithPos `json:"cmdinputtext,omitempty"`
	CmdInputSeqNum     int               `json:"cmdinputseqnum,omitempty"`
}

func ScreenMemSetCmdInputText(screenId string, sp utilfn.StrWithPos, seqNum int) {
	MemLock.Lock()
	defer MemLock.Unlock()
	if ScreenMemStore[screenId] == nil {
		ScreenMemStore[screenId] = &ScreenMemState{}
	}
	if seqNum <= ScreenMemStore[screenId].CmdInputSeqNum {
		return
	}
	ScreenMemStore[screenId].CmdInputText = sp
	ScreenMemStore[screenId].CmdInputSeqNum = seqNum
}

func ScreenMemSetNumRunningCommands(screenId string, num int) {
	MemLock.Lock()
	defer MemLock.Unlock()
	if ScreenMemStore[screenId] == nil {
		ScreenMemStore[screenId] = &ScreenMemState{}
	}
	ScreenMemStore[screenId].NumRunningCommands = num
}

func ScreenMemCombineIndicator(screenId string, indicator string) {
	MemLock.Lock()
	defer MemLock.Unlock()
	if ScreenMemStore[screenId] == nil {
		ScreenMemStore[screenId] = &ScreenMemState{}
	}
	if isIndicatorGreater(indicator, ScreenMemStore[screenId].IndicatorType) {
		ScreenMemStore[screenId].IndicatorType = indicator
	}
}

// safe because we return a copy
func GetScreenMemState(screenId string) *ScreenMemState {
	MemLock.Lock()
	defer MemLock.Unlock()
	ptr := ScreenMemStore[screenId]
	if ptr == nil {
		return nil
	}
	rtn := *ptr
	return &rtn
}