import { Injectable } from '@angular/core';
import { EntryType, RunHistory } from './time-tracker.service';
import { Plan } from '../_models/plan';


export interface RunStat {
    zoneName: string;

    entryTime: string;
    estimatedExit: string;
    estimatedTimeSpent: string;
}

export interface AggregateRunStat {
    zoneName: string;

    aggregateFirstEntry: string;
    aggregateLastExit: string;
    aggregateTimeSpent: string;
    aggregateNumEntries: string;
}

export interface UnformattedAggregateRunStat {
    zoneId: string;

    aggregateFirstEntry: number;
    aggregateLastExit: number;
    aggregateTimeSpent: number;
    aggregateNumEntries: number;
}

export interface UnformattedAggregationData {
    aggregation: UnformattedAggregateRunStat[];
    aggregateNAId: string;
}

export interface UnformattedRunStat {
    zoneId: string;

    entryTime: number;
    estimatedExit?: number;
    estimatedTimeSpent?: number;

    entryType: EntryType;
}

export type RunStatType = RunStat | AggregateRunStat;


@Injectable({
    providedIn: 'root'
})
export class RunStatService {
    /// practically which zone can't have a last exit time as last exit is not determinable for the last entry
    aggregateNAId?: string;

    constructor() { }

    calcAggregated(data: RunHistory): UnformattedAggregationData {
        const aggregation = new Map<string, UnformattedAggregateRunStat>();

        this.aggregateNAId = data.entries[data.entries.length - 1].zone;

        data.entries.forEach((entry, index) => {
            const hasExit = !(data.entries.length - 1 === index);

            let aggregate: UnformattedAggregateRunStat = {
                zoneId: entry.zone,
                aggregateFirstEntry: entry.current_elapsed_millis,
                aggregateLastExit: hasExit ? data.entries[index + 1].current_elapsed_millis : 0,
                aggregateTimeSpent: hasExit ? (data.entries[index + 1].current_elapsed_millis - data.entries[index].current_elapsed_millis) : 0,
                aggregateNumEntries: 1,
            }

            const existing = aggregation.get(entry.zone);
            if (existing) {
                existing.aggregateLastExit = aggregate.aggregateLastExit;
                existing.aggregateTimeSpent += aggregate.aggregateTimeSpent;
                existing.aggregateNumEntries++;
            }

            aggregation.set(entry.zone, existing ?? aggregate);

        });

        return {
            aggregation: Array.from(aggregation.values()),
            aggregateNAId: this.aggregateNAId
        };
    }

    calcDirect(data: RunHistory): UnformattedRunStat[] {
        return data.entries.map((entry, index) => {
            const hasExit = !(data.entries.length - 1 === index);
            return {
                zoneId: entry.zone,
                entryTime: entry.current_elapsed_millis,
                estimatedExit: hasExit ? data.entries[index + 1].current_elapsed_millis : undefined,
                estimatedTimeSpent: hasExit ? (data.entries[index + 1].current_elapsed_millis - data.entries[index].current_elapsed_millis) : undefined,
                entryType: entry.type,
            }
        })
    }

    insertTimesAtCheckpoints(history: RunHistory, plan: Plan) {
        const data = this.calcDirect(history);
        let fakeCurrent = 0;
        console.log("history", history);

        data.forEach(entry => {
            switch (entry.entryType) {
                case EntryType.PlanForceNext:
                    fakeCurrent++;
                    break;
                case EntryType.PlanForcePrev:
                    fakeCurrent--;
                    break;
                case EntryType.ZoneEnter:
                    if (plan.isNext(entry.zoneId, fakeCurrent)) {
                        fakeCurrent++;
                        if (plan.plan[fakeCurrent].checkpoint) {
                            plan.plan[fakeCurrent].checkpoint_millis = entry.entryTime;
                        }
                    }
                    break;
            }
        });

        if (fakeCurrent < plan.plan.length - 1) {
            for (let current = fakeCurrent; current < plan.plan.length; current++) {
                if (plan.plan[current].checkpoint) {
                    plan.plan[current].checkpoint_millis = -1;
                }
            }
        }

        console.log("Inserted checkpoint times", plan);
    }
}