const { cleanLayers } = require('../psapi')

const SessionState = {
    Active: 'active',
    Inactive: 'inactive',
}
const GarbageCollectionState = {
    Accept: 'accept', // accept all generated images
    Discard: 'discard', //discard all generated images
    DiscardSelected: 'discard_selected',
    AcceptSelected: 'accept_selected', //accept_selected only chosen images
}

class GenerationSession {
    constructor() {
        //this should be unique session id and it also should act as the total number of sessions been created in the project
        this.id = 0
        this.state = SessionState['Inactive']
        this.mode = 'txt2img'
        this.selectionInfo = null
        this.isFirstGeneration = true // only before the first generation is requested should this be true
        this.outputGroup
        this.prevOutputGroup
        this.isLoadingActive = false
        this.base64OutputImages = {} //image_id/path => base64_image
        this.base64initImages = {} //init_image_path => base64
        this.base64maskImage = []
        this.activeBase64InitImage
        this.activeBase64MaskImage
        this.image_paths_to_layers = {}
        this.progress_layer
    }
    isActive() {
        return this.state === SessionState['Active']
    }
    isInactive() {
        return this.state === SessionState['Inactive']
    }
    activate() {
        this.state = SessionState['Active']
    }
    deactivate() {
        this.state = SessionState['Inactive']
    }
    name() {
        return `session - ${this.id}`
    }
    async startSession() {
        this.id += 1 //increment the session id for each session we start
        this.activate()
        this.isFirstGeneration = true // only before the first generation is requested should this be true

        console.log('current session id: ', this.id)
        try {
            const session_name = this.name()
            const activeLayers = await app.activeDocument.activeLayers
            await psapi.unselectActiveLayersExe() // unselect all layer so the create group is place at the top of the document
            this.prevOutputGroup = this.outputGroup
            const outputGroup = await psapi.createEmptyGroup(session_name)
            this.outputGroup = outputGroup
            await psapi.selectLayersExe(activeLayers)
        } catch (e) {
            console.warn(e)
        }
    }
    async endSession(garbage_collection_state) {
        try {
            this.state = SessionState['Inactive'] // end the session by deactivate it

            this.deactivate()

            if (garbage_collection_state === GarbageCollectionState['Accept']) {
                await acceptAll()
            } else if (
                garbage_collection_state === GarbageCollectionState['Discard']
            ) {
                //this should be discardAll()

                await discardAll()
            } else if (
                garbage_collection_state ===
                GarbageCollectionState['DiscardSelected']
            ) {
                //this should be discardAllExcept(selectedLayers)
                await discardSelected() //this will discard what is not been highlighted
            } else if (
                garbage_collection_state ===
                GarbageCollectionState['AcceptSelected']
            ) {
                //this should be discardAllExcept(selectedLayers)
                await discard() //this will discard what is not been highlighted
            }

            //delete the old selection area
            // g_generation_session.selectionInfo = {}

            this.isFirstGeneration = true // only before the first generation is requested should this be true
            // const is_visible = await this.outputGroup.visible
            await layer_util.collapseFolderExe([this.outputGroup], false) // close the folder group
            // this.outputGroup.visible = is_visible

            if (
                this.mode === generationMode['Inpaint'] &&
                g_sd_mode === generationMode['Inpaint']
            ) {
                //create "Mask -- Paint White to Mask -- temporary" layer if current session was inpiant and the selected session is inpaint
                // the current inpaint session ended on inpaint
                g_b_mask_layer_exist = false
                await layer_util.deleteLayers([g_inpaint_mask_layer])
                await createTempInpaintMaskLayer()
            }
        } catch (e) {
            console.warn(e)
        }
    }
    async closePreviousOutputGroup() {
        try {
            //close the previous output folder

            if (this.prevOutputGroup) {
                // const is_visible = await this.prevOutputGroup.visible
                await layer_util.collapseFolderExe(
                    [this.prevOutputGroup],
                    false
                ) // close the folder group
                // and reselect the current output folder for clarity
                await psapi.selectLayersExe([this.outputGroup])
                // this.prevOutputGroup.visible = is_visible
            }
        } catch (e) {
            console.warn(e)
        }
    }
    isSameMode(selected_mode) {
        if (this.mode === selected_mode) {
            return true
        }
        return false
    }
    loadLastSession() {
        //load the last session from the server
    }
    saveCurrentSession() {
        //all session info will be saved in a json file in the project folder
    }
    async moveToTopOfOutputGroup(layer) {
        const output_group_id = await this.outputGroup.id
        let group_index = await psapi.getLayerIndex(output_group_id)
        const indexOffset = 1 //1 for background, 0 if no background exist
        await executeAsModal(async () => {
            await psapi.moveToGroupCommand(group_index - indexOffset, layer.id)
        })
    }
    async deleteProgressLayer() {
        try {
            await layer_util.deleteLayers([this.progress_layer]) // delete the old progress layer
        } catch (e) {
            console.warn(e)
        }
    }
}

module.exports = {
    GenerationSession,
    GarbageCollectionState,
    SessionState,
}