import { Meteor } from 'meteor/meteor';
import React, { useState, useEffect } from 'react';
import { useTracker } from 'meteor/react-meteor-data';
import { useTheme } from '@mui/material/styles';
import _ from 'lodash';
import TextField from "@mui/material/TextField";
import Button from "@mui/material/Button";
import MenuItem from '@mui/material/MenuItem';
import {InputLabel, List, ListItem, ListItemButton, ListItemText, Switch} from "@mui/material";
import Box from "@mui/material/Box";
import ToggleButton from '@mui/material/ToggleButton';
import ToggleButtonGroup from '@mui/material/ToggleButtonGroup';
import Dialog from '@mui/material/Dialog';
import DialogActions from '@mui/material/DialogActions';
import DialogContent from '@mui/material/DialogContent';
import DialogContentText from '@mui/material/DialogContentText';
import DialogTitle from '@mui/material/DialogTitle';
import {Assets, conditions} from "/imports/api/assets";
import {AssetTypes} from "/imports/api/asset-types";
import {Students} from "/imports/api/students";
import {Staff} from "/imports/api/staff";
import {Link, useLocation, useNavigate, useNavigationType} from "react-router-dom";
import { Action as NavigationType } from "@remix-run/router";
import FormControlLabel from "@mui/material/FormControlLabel";
import Tab from '@mui/material/Tab';
import TabContext from '@mui/lab/TabContext';
import TabList from '@mui/lab/TabList';
import TabPanel from '@mui/lab/TabPanel';

const cssTwoColumnContainer = {
	display: 'grid',
	gridTemplateColumns: "1fr 1fr",
	columnGap: '1rem',
	rowGap: '0.4rem',
}
const cssEditorField = {
	minWidth: '10rem'
}

const AssignmentsByPerson = () => {
	const navigate = useNavigate()
	const navigateType = useNavigationType()
	const location = useLocation()
	const state = location.state
	const theme = useTheme()
	// const [searchType, setSearchType] = useState("Email")
	const [search, setSearch] = useState(state && state.search ? state.search : "")
	const [includeInactive, setIncludeInactive] = useState(false)
	const [selectedPerson, setSelectedPerson] = useState(state && state.person ? state.person : "")
	const [assetId, setAssetId] = useState("")
	const [openAssignDialog, setOpenAssignDialog] = useState(false)
	const [assignCondition, setAssignCondition] = useState(conditions[2])
	const [assignConditionDetails, setAssignConditionDetails] = useState("")
	
	//Dialog stuff.
	const [openUnassignDialog, setOpenUnassignDialog] = useState(false)
	const [unassignDialogEditConditionOnly, setUnassignDialogEditConditionOnly] = useState(false)
	const [unassignCondition, setUnassignCondition] = useState(conditions[2])
	const [unassignComment, setUnassignComment] = useState("")
	const [unassignConditionDetails, setUnassignConditionDetails] = useState("")
	const [unassignAsset, setUnassignAsset] = useState(undefined)
	
	const [searchInput, setSearchInput] = useState(undefined)
	
	const {people} = useTracker(() => {
		let people = [];
		
		if(search && search.length > 1) {
			let query;
			
			query = {$or: [{email: {$regex: search, $options: 'i'}}, {firstName: {$regex: search, $options: 'i'}}, {firstNameAlias: {$regex: search, $options: 'i'}}, {lastName: {$regex: search, $options: 'i'}}]}
			// if(searchType === "Email") {
			// 	query = {email: {$regex: search, $options: 'i'}};
			// } else if(searchType === 'First Name') {
			// 	query = {firstName: {$regex: search, $options: 'i'}}
			// } else {
			// 	query = {lastName: {$regex: search, $options: 'i'}}
			// }
			
			// Look for students/staff that are active or whose active flag is not set.
			if(!includeInactive) query = {$and: [query, {$or: [{active: true}, {active: {$exists: false}}]}]}
			
			const students = Students.find(query).fetch();
			const staff = Staff.find(query).fetch();
			
			for(let next of students) next.type = "Student"
			for(let next of staff) next.type = "Staff"

			people = [...staff, ...students]
		}
		
		return {people}
	}, [search]);

	const {assets} = useTracker(() => {
		let assets = [];

		if(selectedPerson) {
			assets = Assets.find({assigneeId: selectedPerson._id}).fetch();
			
			for(let next of assets) {
				next.assetType = AssetTypes.findOne({_id: next.assetTypeId})
			}
		}

		return {assets}
	}, [selectedPerson]);

	const {foundAsset} = useTracker(() => {
		let foundAsset = null;
		
		if(assetId) {
			foundAsset = Assets.findOne({assetId: assetId});

			if(foundAsset) {
				foundAsset.assetType = AssetTypes.findOne({_id: foundAsset.assetTypeId})
				
				if(foundAsset.assigneeId) 
					foundAsset.assignee = foundAsset.assigneeType === "Student" ? Students.findOne({_id: foundAsset.assigneeId}) : Staff.findOne({_id: foundAsset.assigneeId})
			}
		}

		return {foundAsset}
	}, [assetId]);

	const [usageData, setUsageData] = useState([])
	const [assignmentData, setAssignmentData] = useState([])

	// Collect the usage and assignment data when the selected person changes.
	useEffect(() => {
		try {
			if(selectedPerson) {
				let query = selectedPerson.type === "Student" ? {studentId: selectedPerson._id} : {staffId: selectedPerson._id}
				
				console.log("Collecting person history")
				console.log(query)
				
				Meteor.call('DataCollection.chromebookData', query, (err, result) => {
					if (err) console.error(err)
					else setUsageData(result)
				})
				Meteor.call('AssetAssignmentHistory.get', query, (err, result) => {
					if (err) console.error(err)
					else setAssignmentData(result)
				})
			}
			else setUsageData({})
		} catch(e) {console.log("Found error in collecting chromebook history & usage in ByPerson.jsx: " + e)}
	}, [selectedPerson])
	
	const getListItemStyle = (item) => {
		return {
			backgroundColor: selectedPerson === item ? '#EECFA6' : 'white'
		}
	}
	const assign = () => {
		if(foundAsset) {
			//Open the dialog to get condition.
			setAssignCondition(foundAsset.condition ? foundAsset.condition : conditions[2])
			setAssignConditionDetails(foundAsset.conditionDetails || "")
			setOpenAssignDialog(true)
		}
	}
	const assignDialogClosed = (assign) => {
		setOpenAssignDialog(false)
		
		if(assign === true) {
			// Call assets.assign
			Meteor.call('assets.assign', foundAsset.assetId, selectedPerson.type, selectedPerson._id, assignCondition, assignConditionDetails, (err, result) => {
				if(err) console.error(err)
				else {
					// Clear the asset id field and set focus to it.
					setAssetId("")
					if(assetIdInput) assetIdInput.focus()
				}
			})
			
			//document.getElementById('assetIdInput').focus()
		}
	}
	
	//Force focus to the search input field when initially rendering.
	useEffect(() => {
		if(searchInput) searchInput.focus()
	}, [searchInput])
	
	const unassign = (asset, editConditionOnly) => {
		// Open the dialog to get condition and comment.
		setUnassignDialogEditConditionOnly(editConditionOnly)
		setUnassignAsset(asset);
		setUnassignComment("")
		setUnassignCondition(asset.condition ? asset.condition : conditions[2])
		setUnassignConditionDetails(asset.conditionDetails || "")
		setOpenUnassignDialog(true);
	}
	const unassignDialogClosed = (unassign) => {
		setOpenUnassignDialog(false)

		if(unassign === true) {
			if(unassignDialogEditConditionOnly) {
				Meteor.call('assets.updateCondition', unassignAsset._id, unassignCondition, unassignConditionDetails, (err, result) => {
					if(err) console.error(err)
					else if(assetIdInput) assetIdInput.focus()
				})
			}
			else {
				// Call assets.unassign(assetId, comment, condition, conditionDetails, date)
				Meteor.call('assets.unassign', unassignAsset.assetId, unassignComment, unassignCondition, unassignConditionDetails, (err, result) => {
					if(err) console.error(err)
					else if(assetIdInput) assetIdInput.focus()
				})
			}
		}
	}

	const getAssetTileStyles = (index) => {
		return index % 2 ? {backgroundColor: '#FFF'} : {backgroundColor: '#d2d2d2'}
	}
	const cssAssetTile = {
		padding: '.8rem',
		userSelect: 'none',
		// '&:nthChild(even)': {backgroundColor: '#935e5e'}
	}

	// Changes the selected person and updates the browser history.
	const changeSelectedPerson = (person) => {
		setSelectedPerson(person)
		navigate("/assignments/byPerson", {replace: false, state: {person, search}});
	}
	
	// Restore the state if the forward/back/refresh functionality of the browser was utilized.
	useEffect(() => {
		if(!state) navigate("/assignments/byPerson", {replace: true, state: {search: "", person: null}})
		else {
			if(navigateType === "POP" || navigateType === 'REPLACE' || navigateType === "PUSH") {
				setSearch(state.search)
				setSelectedPerson(state.person)
			}
		}
	}, [state, navigateType])
	
	const [tab, setTab] = useState('assignments')

	const RenderUsage = ({data}) => {
		return (
			<>
				<ul>
					{data.map((next, i) => (
						<li key={next._id}>
							{/*{next.person && (*/}
							{/*	<>*/}
							{/*		User: {next.person.firstName} {next.person.lastName} {next.person.grade ? "~ " + next.person.grade : ""} (<Link to={"/search?email=" + encodeURIComponent(next.email)}>{next.email}</Link>)<br/>*/}
							{/*	</>*/}
							{/*)}*/}
							{/*Device ID: <Link to={"/search?deviceId=" + encodeURIComponent(next.deviceId)}>{next.deviceId}</Link><br/>*/}
							{next.asset && (
								<>Asset ID: <Link to={"/assignments/byAsset"} state={{assetId: next.asset.assetId}}>{next.asset.assetId}</Link><br/></>
							)}
							<>Asset Type: {next.assetType ? next.assetType.name : "Unknown"}<br/></>
							Serial: {next.serial}<br/>
							{new Date(next.startTime).toLocaleDateString("en-US") + "-" + new Date(next.endTime).toLocaleDateString("en-US") + " @ " + new Date(next.endTime).toLocaleTimeString("en-US")} ({Math.ceil(((next.endTime ? next.endTime : new Date().getTime()) - next.startTime) / (1000*60*60*24))} days)<br/>
							{next.assignedTo && (
								<>Currently assigned to: {next.assignedTo.firstName} {next.assignedTo.lastName} {next.assignedTo.grade ? "~ " + next.assignedTo.grade : ""} ({next.assignedTo.email})</>
							)}
						</li>
					))}
				</ul>
			</>
		)
	}

	const RenderAssignments = ({data}) => {
		return (
			<>
				<ul>
					{data.map((next, i) => (
						<li key={next._id + "/" + next.assetId}>
							{/*{next.assignee && (*/}
							{/*	<>*/}
							{/*		User: {next.assignee.firstName} {next.assignee.lastName} {next.assignee.grade ? "~ " + next.assignee.grade : ""} (<Link to={"/search?email=" + encodeURIComponent(next.assignee.email)}>{next.assignee.email}</Link>)<br/>*/}
							{/*	</>*/}
							{/*)}*/}
							{next.asset && (
								<>
									Asset ID: <Link to={"/assignments/byAsset"} state={{assetId: next.asset.assetId}}>{next.asset.assetId}</Link><br/>
								</>
							)}
							{next.assetType && (
								<>
									Asset Type: {next.assetType.name}<br/>
								</>
							)}
							Serial: {next.serial}<br/>
							{new Date(next.startDate).toLocaleDateString("en-US") + (next.endDate ? "-" + new Date(next.endDate).toLocaleDateString("en-US") : " - Still Assigned")} ({Math.ceil(((next.endDate ? next.endDate : new Date().getTime()) - next.startDate) / (1000*60*60*24))} days)<br/>
							{next.comment && (
								<>Comment: {next.comment}<br/></>
							)}
							Start Condition: {next.startCondition}<br/>
							{next.startConditionDetails && <>Details: {next.startConditionDetails}<br/></>}
							{next.endDate && (
								<>
									End Condition: {next.endCondition}<br/>
									{next.endConditionDetails && <>Details: {next.endConditionDetails}<br/></>}
								</>
							)}
						</li>
					))}
				</ul>
			</>
		)
	}
	
	return (
		<>
			<Dialog open={openAssignDialog} onClose={assignDialogClosed}>
				<DialogTitle>Assign Asset</DialogTitle>
				<DialogContent style={{display: 'flex', flexDirection: 'column'}}>
					<div>
						<TextField style={cssEditorField} select variant="standard" label="Condition" value={assignCondition} onChange={(e)=>{setAssignCondition(e.target.value)}}>
							{conditions.map((condition, i) => {
								return <MenuItem key={i} value={condition}>{condition}</MenuItem>
							})}
						</TextField>
					</div>
					<TextField style={{marginTop: '1rem',minWidth: '30rem'}} multiline rows={4} variant="outlined" label="Condition Details" value={assignConditionDetails} onChange={(e) => {setAssignConditionDetails(e.target.value)}}/>
				</DialogContent>
				<DialogActions>
					<Button onClick={() => assignDialogClosed(true)}>Assign</Button>
					<Button onClick={() => assignDialogClosed(false)}>Cancel</Button>
				</DialogActions>
			</Dialog>
			
			<Dialog open={openUnassignDialog} onClose={unassignDialogClosed}>
				<DialogTitle>{unassignDialogEditConditionOnly ? "Edit Condition" : "Unassign Asset"}</DialogTitle>
				<DialogContent style={{display: 'flex', flexDirection: 'column'}}>
					<div>
						<TextField style={cssEditorField} select variant="standard" label="Condition" value={unassignCondition} onChange={(e)=>{setUnassignCondition(e.target.value)}}>
							{conditions.map((condition, i) => {
								return <MenuItem key={i} value={condition}>{condition}</MenuItem>
							})}
						</TextField>
					</div>
					{!unassignDialogEditConditionOnly && <TextField style={{marginTop: '1rem',minWidth: '30rem'}} variant="standard" label="Comment" value={unassignComment} onChange={(e) => {setUnassignComment(e.target.value)}}/>}
					<TextField style={{marginTop: '1rem',minWidth: '30rem'}} multiline rows={4} variant="outlined" label="Condition Details" value={unassignConditionDetails} onChange={(e) => {setUnassignConditionDetails(e.target.value)}}/>
				</DialogContent>
				<DialogActions>
					<Button onClick={() => unassignDialogClosed(true)}>{unassignDialogEditConditionOnly ? "Save" : "Unassign"}</Button>
					<Button onClick={() => unassignDialogClosed(false)}>Cancel</Button>
				</DialogActions>
			</Dialog>
			
			<Box style={{margin: '1rem 0 0 0', padding: '0 1rem',...cssTwoColumnContainer, width: "24rem"}}>
				{/*<ToggleButtonGroup color="primary" value={searchType} exclusive onChange={(e, type)=>setSearchType(type)} aria-label="Search Type">*/}
				{/*	<ToggleButton value="Email">Email</ToggleButton>*/}
				{/*	<ToggleButton value="First Name">First Name</ToggleButton>*/}
				{/*	<ToggleButton value="Last Name">Last Name</ToggleButton>*/}
				{/*</ToggleButtonGroup>*/}
				<FormControlLabel sx={{marginTop: '0.7rem'}} control={<Switch variant="standard" checked={includeInactive} onChange={(e) => {setIncludeInactive(e.target.checked)}}/>} label="Inactive"/>
				<TextField style={cssEditorField} variant="standard" label="Search" inputRef={input=>setSearchInput(input)} value={search} onChange={(e) => {setSearch(e.target.value)}}/>
			</Box>
			<Box style={{...cssTwoColumnContainer, gridTemplateColumns: "24rem 1fr"}}>
				<div style={{maxHeight: '26rem', overflowY:'auto', minWidth: '10rem', minHeight: '10rem', maxWidth: '40rem'}}>
					<List>
						{people.map((next, i) => {
							return (
								<ListItemButton key={next._id} style={getListItemStyle(next)} selected={selectedPerson === next} onClick={(e) => {changeSelectedPerson(next)}}>
									<ListItemText primary={next.firstName + " " + (next.firstNameAlias ? "'" + next.firstNameAlias + "' " : "") + next.lastName + (next.grade ? " (" + next.grade + ")" : "")} secondary={next.email}/>
								</ListItemButton>
							)
						})}
					</List>
				</div>
				<div style={{display: 'flex', flexDirection: 'column', margin: '0 0 0 .5rem'}}>
					{selectedPerson && (
						<>
							<h3 style={{margin: "0 0 0.5rem 0"}}>{selectedPerson.firstName + " " + (selectedPerson.firstNameAlias ? "'" + selectedPerson.firstNameAlias + "' " : "") + selectedPerson.lastName + (selectedPerson.grade ? " (" + selectedPerson.grade + ")" : "")}</h3>
							<TabContext value={tab}>
								<Box sx={{borderBottom: 1, borderColor: 'divider'}}>
									<TabList onChange={(e, v)=>setTab(v)}>
										<Tab label="Assignments" value="assignments"/>
										<Tab label="Assignment History" value="assignmentHistory"/>
										<Tab label="Usage History" value="usageHistory"/>
									</TabList>
								</Box>
								<TabPanel value="assignments">
									<div style={{...cssAssetTile, paddingTop: "0"}}>
										<div style={{marginBottom: '1rem'}}><TextField id='assetIdInput' style={cssEditorField} variant="standard" label="Asset ID" value={assetId} onChange={(e) => {setAssetId(e.target.value.toUpperCase())}}/></div>
										{foundAsset && (
											<>
												<div>{foundAsset && foundAsset.assetType.name}</div>
												<div>Asset ID: <Link to={"/search?assetId=" + encodeURIComponent(foundAsset.assetId)}>{foundAsset.assetId}</Link></div>
												<div>Serial: <Link to={"/search?serial=" + encodeURIComponent(foundAsset.serial)}>{foundAsset.serial}</Link></div>
											</>	
										)}
										{foundAsset && foundAsset.assignee && (
											<>
												<div>Assigned To: {foundAsset.assignee.firstName} {foundAsset.assignee.lastName}</div>
												<div>Assigned: {new Date(foundAsset.assignmentDate).toLocaleDateString("en-US")} ({Math.ceil((new Date().getTime() - foundAsset.assignmentDate) / (1000*60*60*24))} days)</div>
											</>
										)}
										<Button variant="contained" color='primary' className="button" disabled={!foundAsset || foundAsset.assignee !== undefined} onClick={()=>assign()}>Assign</Button>
									</div>
									{assets.map((next, i) => {
										return (
											<div key={next._id} style={{...getAssetTileStyles(i), ...cssAssetTile}}>
												<div style={{fontWeight: 800}}>{next.assetType.name}</div>
												<div>Asset ID: <Link to={"/assignments/byAsset"} state={{assetId: next.assetId}}>{next.assetId}</Link></div>
												<div>Serial: {next.serial}</div>
												<div>Assigned: {new Date(next.assignmentDate).toLocaleDateString("en-US")} ({Math.ceil((new Date().getTime() - next.assignmentDate) / (1000*60*60*24))} days)</div>
												<Button variant="contained" color='secondary' className="button" onClick={()=>unassign(next, false)}>Unassign</Button>
												{"  "}
												<Button variant="contained" color='secondary' className="button" onClick={()=>unassign(next, true)}>Edit</Button>
											</div>
										)
									})}
								</TabPanel>
								<TabPanel value="assignmentHistory">
									<RenderAssignments data={assignmentData}/>
								</TabPanel>
								<TabPanel value="usageHistory">
									<RenderUsage data={usageData}/>
								</TabPanel>
							</TabContext>
						</>
					)}
				</div>
			</Box>
		</>
	)
}

export default () => {
	Meteor.subscribe('students');
	Meteor.subscribe('staff');
	Meteor.subscribe('assetTypes');
	Meteor.subscribe('assets');

	return (
		<AssignmentsByPerson/>
	)
}