import { FunctionalComponent, h } from "preact";
import { useState, useEffect } from "preact/hooks";
import * as style from "./style.css";
import { Project } from "../../models/project";
import { newTask, Task, TaskID, EstimationConfidence } from "../../models/task";



export interface TaskTableProps {
    project: Project
    onTaskAdd: (task: Task) => void
    onTaskRemove: (taskId: TaskID) => void
    onEstimationChange: (taskId: TaskID, confidence: EstimationConfidence, value: number) => void
}

export type EstimationTotals = { [confidence in EstimationConfidence]: number }

const TaskTable: FunctionalComponent<TaskTableProps> = ({ project, onTaskAdd, onEstimationChange, onTaskRemove }) => {
    
    const defaultTaskCategory = Object.keys(project.params.taskCategories)[0];
    const [ task, setTask ] = useState(newTask("", defaultTaskCategory));
    const [ totals, setTotals ] = useState({
        [EstimationConfidence.Optimistic]: 0,
        [EstimationConfidence.Likely]: 0,
        [EstimationConfidence.Pessimistic]: 0,
    } as EstimationTotals);

    useEffect(() => {
        let optimistic = 0;
        let likely = 0;
        let pessimistic = 0;

        Object.values(project.tasks).forEach(t => {
            optimistic += t.estimations.optimistic;
            likely += t.estimations.likely;
            pessimistic += t.estimations.pessimistic;
        });

        setTotals({ optimistic, likely, pessimistic });
    }, [project.tasks]);

    const onTaskLabelChange = (evt: Event) => {
        const value = (evt.currentTarget as HTMLInputElement).value;
        setTask({...task, label: value});
    };

    const onTaskCategoryChange = (evt: Event) => {
        const value = (evt.currentTarget as HTMLInputElement).value;
        setTask({...task, category: value});
    };

    const onAddTaskClick = (evt: Event) => {
        onTaskAdd(task);
        setTask(newTask("", defaultTaskCategory));
    };

    const onTaskRemoveClick = (taskId: TaskID, evt: Event) => {
        onTaskRemove(taskId);
    };

    const withEstimationChange = (confidence: EstimationConfidence, taskID: TaskID, evt: Event) => {
        const textValue = (evt.currentTarget as HTMLInputElement).value;
        const value = parseFloat(textValue);
        onEstimationChange(taskID, confidence, value);
    };

    const onOptimisticChange = withEstimationChange.bind(null, EstimationConfidence.Optimistic);
    const onLikelyChange = withEstimationChange.bind(null, EstimationConfidence.Likely);
    const onPessimisticChange = withEstimationChange.bind(null, EstimationConfidence.Pessimistic);

    return (
        <div class="table-container">
            <table class="table is-bordered is-striped is-hoverable is-fullwidth">
                <thead>
                    <tr>
                        <th class={style.noBorder} rowSpan={2}></th>
                        <th class={style.mainColumn} rowSpan={2}>Tâche</th>
                        <th rowSpan={2}>Catégorie</th>
                        <th colSpan={3}>Estimation</th>
                    </tr>
                    <tr>
                        <th>Optimiste</th>
                        <th>Probable</th>
                        <th>Pessimiste</th>
                    </tr>
                </thead>
                <tbody>
                    {
                        Object.values(project.tasks).map(t => {
                            const category = project.params.taskCategories[t.category];
                            const categoryLabel = category ? category.label : '???';
                            return (
                                <tr key={`taks-${t.id}`}>
                                    <td class="is-narrow">
                                        <button
                                            onClick={onTaskRemoveClick.bind(null, t.id)}
                                            class="button is-danger is-small is-outlined">
                                        🗑️
                                        </button>
                                    </td>
                                    <td class={style.mainColumn}>{t.label}</td>
                                    <td>{ categoryLabel }</td>
                                    <td>
                                        <input class="input" type="number" value={t.estimations.optimistic}
                                            min={0}
                                            onChange={onOptimisticChange.bind(null, t.id)} />
                                    </td>
                                    <td>
                                        <input class="input" type="number" value={t.estimations.likely}
                                            min={0}
                                            onChange={onLikelyChange.bind(null, t.id)} />
                                    </td>
                                    <td>
                                        <input class="input" type="number" value={t.estimations.pessimistic}
                                            min={0}
                                            onChange={onPessimisticChange.bind(null, t.id)} />
                                    </td>
                                </tr>
                            )
                        })
                    }
                    {
                        Object.keys(project.tasks).length === 0 ?
                        <tr>
                            <td class={style.noBorder}></td>
                            <td class={style.noTasks} colSpan={5}>Aucune tâche pour l'instant.</td>
                        </tr> :
                        null
                    }
                </tbody>
                <tfoot>
                    <tr>
                        <td class={style.noBorder}></td>
                        <td colSpan={2}>
                            <div class="field has-addons">
                                <p class="control is-expanded">
                                    <input class="input" type="text" placeholder="Nouvelle tâche"
                                        value={task.label} onChange={onTaskLabelChange} />
                                </p>
                                <p class="control">
                                    <span class="select">
                                    <select onChange={onTaskCategoryChange} value={task.category}>
                                        {
                                            Object.values(project.params.taskCategories).map(tc => {
                                                return (
                                                <option key={`task-category-${tc.id}`} value={tc.id}>{tc.label}</option>
                                                );
                                            })
                                        }
                                    </select>
                                    </span>
                                </p>
                                <p class="control">
                                    <a class="button is-primary" onClick={onAddTaskClick}>
                                    Ajouter
                                    </a>
                                </p>
                            </div>
                        </td>
                        <th colSpan={3}>Total</th>
                    </tr>
                    <tr>
                        <td colSpan={3} class={style.noBorder}></td>
                        <td>{totals.optimistic}</td>
                        <td>{totals.likely}</td>
                        <td>{totals.pessimistic}</td>
                    </tr>
                </tfoot>
            </table>
        </div>
    );
};

export default TaskTable;