/**
 * Enum of parameter types
 * @readonly
 * @enum {string}
 */
 var ParameterType = {
    checkbox: "checkbox",
	select: "select",
	select_multiple: "select_multiple",
	custom: "custom",
};

/**
 * JSDoc style
 * @typedef {object} Parameter
 * @property {string} id
 * @property {ParameterType} type
 * @property {string} label
 * @property {?string} note
 * @property {number|boolean|string} default
 */


/** @type {Array.<Parameter>} */
var PARAMETERS = [
	{
		id: "theme",
		type: ParameterType.select,
		label: "Theme",
		default: "theme-default",
		options: [ // Note: options expanded dynamically
			{
				value: "theme-default",
				label: "Default"
			}
		]
	},
	{
		id: "save_to_disk",
		type: ParameterType.checkbox,
		label: "Auto-Save Images",
		note: "automatically saves images to the specified location",
		default: false,
	},
	{
		id: "diskPath",
		type: ParameterType.custom,
		label: "Save Location",
		render: (parameter) => {
			return `<input id="${parameter.id}" name="${parameter.id}" size="30" disabled>`
		}
	},
	{
		id: "sound_toggle",
		type: ParameterType.checkbox,
		label: "Enable Sound",
		note: "plays a sound on task completion",
		default: true,
	},
	{
		id: "ui_open_browser_on_start",
		type: ParameterType.checkbox,
		label: "Open browser on startup",
		note: "starts the default browser on startup",
		default: true,
	},
	{
		id: "turbo",
		type: ParameterType.checkbox,
		label: "Turbo Mode",
		default: true,
		note: "generates images faster, but uses an additional 1 GB of GPU memory",
	},
	{
		id: "use_cpu",
		type: ParameterType.checkbox,
		label: "Use CPU (not GPU)",
		note: "warning: this will be *very* slow",
		default: false,
	},
	{
		id: "auto_pick_gpus",
		type: ParameterType.checkbox,
		label: "Automatically pick the GPUs (experimental)",
		default: false,
	},
	{
		id: "use_gpus",
		type: ParameterType.select_multiple,
		label: "GPUs to use (experimental)",
		note: "to process in parallel",
		default: false,
	},
	{
		id: "use_full_precision",
		type: ParameterType.checkbox,
		label: "Use Full Precision",
		note: "for GPU-only. warning: this will consume more VRAM",
		default: false,
	},
	{
		id: "auto_save_settings",
		type: ParameterType.checkbox,
		label: "Auto-Save Settings",
		note: "restores settings on browser load",
		default: true,
	},
	{
		id: "use_beta_channel",
		type: ParameterType.checkbox,
		label: "🔥Beta channel",
		note: "Get the latest features immediately (but could be less stable). Please restart the program after changing this.",
		default: false,
	},
];

function getParameterSettingsEntry(id) {
	let parameter = PARAMETERS.filter(p => p.id === id)
	if (parameter.length === 0) {
		return
	}
	return parameter[0].settingsEntry
}

function getParameterElement(parameter) {
	switch (parameter.type) {
		case ParameterType.checkbox:
			var is_checked = parameter.default ? " checked" : "";
			return `<input id="${parameter.id}" name="${parameter.id}"${is_checked} type="checkbox">`
		case ParameterType.select:
		case ParameterType.select_multiple:
			var options = (parameter.options || []).map(option => `<option value="${option.value}">${option.label}</option>`).join("")
			var multiple = (parameter.type == ParameterType.select_multiple ? 'multiple' : '')
			return `<select id="${parameter.id}" name="${parameter.id}" ${multiple}>${options}</select>`
		case ParameterType.custom:
			return parameter.render(parameter)
		default:
			console.error(`Invalid type for parameter ${parameter.id}`);
			return "ERROR: Invalid Type"
	}
}

let parametersTable = document.querySelector("#system-settings table")
/* fill in the system settings popup table */
function initParameters() {
	PARAMETERS.forEach(parameter => {
		var element = getParameterElement(parameter)
		var note = parameter.note ? `<small>${parameter.note}</small>` : "";
		var newrow = document.createElement('tr')
		newrow.innerHTML = `
			<td><label for="${parameter.id}">${parameter.label}</label></td>
			<td><div>${element}${note}<div></td>`
		parametersTable.appendChild(newrow)
		parameter.settingsEntry = newrow
	})
}

initParameters()

let turboField = document.querySelector('#turbo')
let useCPUField = document.querySelector('#use_cpu')
let autoPickGPUsField = document.querySelector('#auto_pick_gpus')
let useGPUsField = document.querySelector('#use_gpus')
let useFullPrecisionField = document.querySelector('#use_full_precision')
let saveToDiskField = document.querySelector('#save_to_disk')
let diskPathField = document.querySelector('#diskPath')
let useBetaChannelField = document.querySelector("#use_beta_channel")
let uiOpenBrowserOnStartField = document.querySelector("#ui_open_browser_on_start")

let saveSettingsBtn = document.querySelector('#save-system-settings-btn')

async function changeAppConfig(configDelta) {
    try {
        let res = await fetch('/app_config', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(configDelta)
        })
        res = await res.json()

        console.log('set config status response', res)
    } catch (e) {
        console.log('set config status error', e)
    }
}

async function getAppConfig() {
    try {
        let res = await fetch('/get/app_config')
        const config = await res.json()

        if (config.update_branch === 'beta') {
            useBetaChannelField.checked = true
        }
        if (config.ui && config.ui.open_browser_on_start === false) {
            uiOpenBrowserOnStartField.checked = false
        }

        console.log('get config status response', config)
    } catch (e) {
        console.log('get config status error', e)
    }
}

saveToDiskField.addEventListener('change', function(e) {
    diskPathField.disabled = !this.checked
})

function getCurrentRenderDeviceSelection() {
    let selectedGPUs = $('#use_gpus').val()

    if (useCPUField.checked && !autoPickGPUsField.checked) {
        return 'cpu'
    }
    if (autoPickGPUsField.checked || selectedGPUs.length == 0) {
        return 'auto'
    }

    return selectedGPUs.join(',')
}

useCPUField.addEventListener('click', function() {
    let gpuSettingEntry = getParameterSettingsEntry('use_gpus')
    let autoPickGPUSettingEntry = getParameterSettingsEntry('auto_pick_gpus')
    if (this.checked) {
        gpuSettingEntry.style.display = 'none'
        autoPickGPUSettingEntry.style.display = 'none'
        autoPickGPUsField.setAttribute('data-old-value', autoPickGPUsField.checked)
        autoPickGPUsField.checked = false
    } else if (useGPUsField.options.length >= MIN_GPUS_TO_SHOW_SELECTION) {
        gpuSettingEntry.style.display = ''
        autoPickGPUSettingEntry.style.display = ''
        let oldVal = autoPickGPUsField.getAttribute('data-old-value')
        if (oldVal === null || oldVal === undefined) { // the UI started with CPU selected by default
            autoPickGPUsField.checked = true
        } else {
            autoPickGPUsField.checked = (oldVal === 'true')
        }
        gpuSettingEntry.style.display = (autoPickGPUsField.checked ? 'none' : '')
    }
})

useGPUsField.addEventListener('click', function() {
    let selectedGPUs = $('#use_gpus').val()
    autoPickGPUsField.checked = (selectedGPUs.length === 0)
})

autoPickGPUsField.addEventListener('click', function() {
    if (this.checked) {
        $('#use_gpus').val([])
    }

    let gpuSettingEntry = getParameterSettingsEntry('use_gpus')
    gpuSettingEntry.style.display = (this.checked ? 'none' : '')
})

async function getDiskPath() {
    try {
        var diskPath = getSetting("diskPath")
        if (diskPath == '' || diskPath == undefined || diskPath == "undefined") {
            let res = await fetch('/get/output_dir')
            if (res.status === 200) {
                res = await res.json()
                res = res.output_dir

                setSetting("diskPath", res)
            }
        }
    } catch (e) {
        console.log('error fetching output dir path', e)
    }
}

async function getDevices() {
    try {
        let res = await fetch('/get/devices')
        if (res.status === 200) {
            res = await res.json()

            let allDeviceIds = Object.keys(res['all']).filter(d => d !== 'cpu')
            let activeDeviceIds = Object.keys(res['active']).filter(d => d !== 'cpu')

            if (activeDeviceIds.length === 0) {
                useCPUField.checked = true
            }

            if (allDeviceIds.length < MIN_GPUS_TO_SHOW_SELECTION || useCPUField.checked) {
                let gpuSettingEntry = getParameterSettingsEntry('use_gpus')
                gpuSettingEntry.style.display = 'none'
                let autoPickGPUSettingEntry = getParameterSettingsEntry('auto_pick_gpus')
                autoPickGPUSettingEntry.style.display = 'none'
            }

            if (allDeviceIds.length === 0) {
                useCPUField.checked = true
                useCPUField.disabled = true // no compatible GPUs, so make the CPU mandatory
            }

            autoPickGPUsField.checked = (res['config'] === 'auto')

            useGPUsField.innerHTML = ''
            allDeviceIds.forEach(device => {
                let deviceName = res['all'][device]['name']
                let deviceOption = `<option value="${device}">${deviceName} (${device})</option>`
                useGPUsField.insertAdjacentHTML('beforeend', deviceOption)
            })

            if (autoPickGPUsField.checked) {
                let gpuSettingEntry = getParameterSettingsEntry('use_gpus')
                gpuSettingEntry.style.display = 'none'
            } else {
                $('#use_gpus').val(activeDeviceIds)
            }
        }
    } catch (e) {
        console.log('error fetching devices', e)
    }
}

saveSettingsBtn.addEventListener('click', function() {
	let updateBranch = (useBetaChannelField.checked ? 'beta' : 'main')

	changeAppConfig({
        'render_devices': getCurrentRenderDeviceSelection(),
		'update_branch': updateBranch,
		'ui_open_browser_on_start': uiOpenBrowserOnStartField.checked
    })

	saveSettingsBtn.classList.add('active')
	asyncDelay(300).then(() => saveSettingsBtn.classList.remove('active'))
})