/*
 * Copyright © 2020 Atomist, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {
    AutomationContextAware,
    HandlerContext,
} from "@atomist/automation-client/lib/HandlerContext";
import { RemoteRepoRef } from "@atomist/automation-client/lib/operations/common/RepoId";
import { MutationNoCacheOptions } from "@atomist/automation-client/lib/spi/graph/GraphClient";
import * as _ from "lodash";
import * as omitEmpty from "omit-empty";
import { sprintf } from "sprintf-js";
import {
    Goal,
    hasPreconditions,
} from "../../api/goal/Goal";
import { Parameterized } from "../../api/goal/GoalWithFulfillment";
import { SdmGoalEvent } from "../../api/goal/SdmGoalEvent";
import {
    SdmGoalFulfillment,
    SdmGoalFulfillmentMethod,
    SdmGoalKey,
    SdmGoalMessage,
    SdmProvenance,
} from "../../api/goal/SdmGoalMessage";
import { SdmGoalSetMessage } from "../../api/goal/SdmGoalSetMessage";
import { GoalImplementation } from "../../api/goal/support/GoalImplementationMapper";
import { GoalSetTag } from "../../api/goal/tagGoalSet";
import {
    OnPushToAnyBranch,
    PushFields,
    SdmGoalState,
    UpdateSdmGoalMutation,
    UpdateSdmGoalMutationVariables,
    UpdateSdmGoalSetMutation,
    UpdateSdmGoalSetMutationVariables,
} from "../../typings/types";

export function environmentFromGoal(goal: Goal): string {
    return goal.definition.environment.replace(/\/$/, ""); // remove trailing slash at least
}

export interface UpdateSdmGoalParams {
    state: SdmGoalState;
    description: string;
    url?: string;
    externalUrls?: Array<{ label?: string, url: string }>;
    approved?: boolean;
    error?: Error;
    data?: string;
    phase?: string;
}

export async function updateGoal(ctx: HandlerContext,
                                 before: SdmGoalEvent,
                                 params: UpdateSdmGoalParams): Promise<void> {
    const description = params.description;
    const approval = params.approved ? constructProvenance(ctx) :
        !!before ? before.approval : undefined;
    const data = params.data ?
        params.data :
        !!before ? before.data : undefined;
    before.version = (before.version || 1) + 1;
    const sdmGoal = {
        ...eventToMessage(before),
        state: params.state === "success" && !!before && before.approvalRequired ? SdmGoalState.waiting_for_approval : params.state,
        phase: params.phase,
        description,
        url: params.url ? params.url : before.url,
        externalUrls: params.externalUrls ? params.externalUrls : before.externalUrls,
        approval,
        ts: Date.now(),
        provenance: [constructProvenance(ctx)].concat(!!before ? before.provenance : []),
        error: _.get(params, "error.message"),
        data,
        push: cleanPush(before.push),
        version: before.version,
    };

    await storeGoal(ctx, sdmGoal);
}

function eventToMessage(event: SdmGoalEvent): SdmGoalMessage {
    return {
        ...event,
        repo: {
            name: event.repo.name,
            owner: event.repo.owner,
            providerId: event.repo.providerId,
        },
        id: undefined,
    } as any;
}

export function goalCorrespondsToSdmGoal(goal: Goal, sdmGoal: SdmGoalKey): boolean {
    return goal.name === sdmGoal.name && environmentFromGoal(goal) === sdmGoal.environment;
}

export function constructSdmGoalImplementation(gi: GoalImplementation, registration: string): SdmGoalFulfillment {
    return {
        method: SdmGoalFulfillmentMethod.Sdm,
        name: gi.implementationName,
        registration,
    };
}

export function constructSdmGoal(ctx: HandlerContext, parameters: {
    goalSet: string,
    goalSetId: string,
    goal: Goal,
    state: SdmGoalState,
    id: RemoteRepoRef,
    providerId: string
    url?: string,
    fulfillment?: SdmGoalFulfillment,
}): SdmGoalMessage {
    const { goalSet, goal, goalSetId, state, id, providerId, url } = parameters;
    const fulfillment = parameters.fulfillment || {
        method: SdmGoalFulfillmentMethod.Other,
        name: "unknown",
        registration: "unknown",
    };

    if (!id.branch) {
        throw new Error(sprintf("Please provide a branch in the RemoteRepoRef %j", parameters));
    }
    if (!id.sha) {
        throw new Error(sprintf("Please provide a sha in the RemoteRepoRef %j", parameters));
    }

    const preConditions: SdmGoalKey[] = [];
    const description = descriptionFromState(goal, state);
    const environment = environmentFromGoal(goal);
    if (hasPreconditions(goal)) {
        preConditions.push(...goal.dependsOn.map(d => ({
            goalSet,
            name: d.name,
            uniqueName: d.uniqueName,
            environment: environmentFromGoal(d),
        })));
    }
    const retryFeasible = goal.definition.retryFeasible ? goal.definition.retryFeasible : false;
    return {
        goalSet,
        registration: (ctx as any as AutomationContextAware).context.name,
        goalSetId,
        name: goal.name,
        uniqueName: goal.uniqueName,
        environment,
        fulfillment,
        sha: id.sha,
        branch: id.branch,
        repo: {
            name: id.repo,
            owner: id.owner,
            providerId,
        },
        state,
        description,
        descriptions: {
            planned: goal.plannedDescription,
            requested: goal.requestedDescription,
            inProcess: goal.inProcessDescription,
            completed: goal.successDescription,
            failed: goal.failureDescription,
            canceled: goal.canceledDescription,
            stopped: goal.stoppedDescription,
            skipped: goal.skippedDescription,
            waitingForApproval: goal.waitingForApprovalDescription,
            waitingForPreApproval: goal.waitingForPreApprovalDescription,
        },
        url,
        externalKey: goal.context,
        ts: Date.now(),
        approvalRequired: goal.definition.approvalRequired ? goal.definition.approvalRequired : false,
        preApprovalRequired: goal.definition.preApprovalRequired ? goal.definition.preApprovalRequired : false,
        retryFeasible,
        provenance: [constructProvenance(ctx)],
        preConditions,
        parameters: !!(goal.definition as Parameterized).parameters ?
            JSON.stringify((goal.definition as Parameterized).parameters) : undefined,
        version: 1,
    };
}

export async function storeGoal(ctx: HandlerContext,
                                sdmGoal: SdmGoalMessage): Promise<SdmGoalMessage> {
    const newGoal = omitEmpty(sdmGoal, { omitZero: false });
    delete (newGoal).push;
    await ctx.graphClient.mutate<UpdateSdmGoalMutation, UpdateSdmGoalMutationVariables>({
        name: "UpdateSdmGoal",
        variables: {
            goal: newGoal,
        },
        options: MutationNoCacheOptions,
    });

    return sdmGoal;
}

export function constructProvenance(ctx: HandlerContext): SdmProvenance {
    return {
        registration: (ctx as any as AutomationContextAware).context.name,
        version: (ctx as any as AutomationContextAware).context.version,
        name: (ctx as any as AutomationContextAware).context.operation,
        correlationId: ctx.correlationId,
        ts: Date.now(),
    };
}

export function descriptionFromState(goal: Goal, state: SdmGoalState, goalEvent?: SdmGoalEvent): string {
    switch (state) {
        case SdmGoalState.planned:
            return _.get(goalEvent, "descriptions.planned", goal.plannedDescription);
        case SdmGoalState.requested:
            return _.get(goalEvent, "descriptions.requested", goal.requestedDescription);
        case SdmGoalState.in_process:
            return _.get(goalEvent, "descriptions.inProcess", goal.inProcessDescription);
        case SdmGoalState.waiting_for_approval:
            return _.get(goalEvent, "descriptions.waitingForApproval", goal.waitingForApprovalDescription);
        case SdmGoalState.waiting_for_pre_approval:
            return _.get(goalEvent, "descriptions.waitingForPreApproval", goal.waitingForPreApprovalDescription);
        case SdmGoalState.success:
            return _.get(goalEvent, "descriptions.completed", goal.successDescription);
        case SdmGoalState.failure:
            return _.get(goalEvent, "descriptions.failed", goal.failureDescription);
        case SdmGoalState.skipped:
            return _.get(goalEvent, "descriptions.skipped", goal.skippedDescription);
        case SdmGoalState.canceled:
            return _.get(goalEvent, "descriptions.canceled", goal.canceledDescription);
        case SdmGoalState.stopped:
            return _.get(goalEvent, "descriptions.stopped", goal.stoppedDescription);
        default:
            throw new Error("Unknown goal state " + state);
    }
}

export function constructGoalSet(ctx: HandlerContext,
                                 goalSetId: string,
                                 goalSet: string,
                                 sdmGoals: SdmGoalMessage[],
                                 tags: GoalSetTag[],
                                 push: OnPushToAnyBranch.Push): SdmGoalSetMessage {
    let repo;
    if (!!push) {
        repo = {
            name: push.repo.name,
            owner: push.repo.owner,
            providerId: push.repo.org.provider.providerId,
        };
    } else if (!!sdmGoals && sdmGoals.length > 0) {
        const goal = sdmGoals.find(g => !!g.repo);
        if (!!goal) {
            repo = {
                name: goal.repo.name,
                owner: goal.repo.owner,
                providerId: goal.repo.providerId,
            };
        }
    }

    const sdmGoalSet: SdmGoalSetMessage = {
        sha: push.after.sha,
        branch: push.branch,
        goalSetId,
        goalSet,
        ts: Date.now(),
        repo,
        state: goalSetState(sdmGoals),
        goals: sdmGoals.map(g => ({
            name: g.name,
            uniqueName: g.uniqueName,
        })),
        provenance: constructProvenance(ctx),
        tags,
    };

    return sdmGoalSet;
}

export async function storeGoalSet(ctx: HandlerContext,
                                   goalSet: SdmGoalSetMessage): Promise<void> {

    await ctx.graphClient.mutate<UpdateSdmGoalSetMutation, UpdateSdmGoalSetMutationVariables>({
        name: "UpdateSdmGoalSet",
        variables: {
            goalSet: omitEmpty(goalSet, { omitZero: false }),
        },
        options: MutationNoCacheOptions,
    });

}

export function goalSetState(goals: Array<Pick<SdmGoalMessage, "name" | "state">>): SdmGoalState {
    if (goals.some(g => g.state === SdmGoalState.failure)) {
        return SdmGoalState.failure;
    } else if (goals.some(g => g.state === SdmGoalState.canceled)) {
        return SdmGoalState.canceled;
    } else if (goals.some(g => g.state === SdmGoalState.stopped)) {
        return SdmGoalState.stopped;
    } else if (goals.some(g => g.state === SdmGoalState.in_process)) {
        return SdmGoalState.in_process;
    } else if (goals.some(g => g.state === SdmGoalState.waiting_for_pre_approval)) {
        return SdmGoalState.waiting_for_pre_approval;
    } else if (goals.some(g => g.state === SdmGoalState.waiting_for_approval)) {
        return SdmGoalState.waiting_for_approval;
    } else if (goals.some(g => g.state === SdmGoalState.pre_approved)) {
        return SdmGoalState.pre_approved;
    } else if (goals.some(g => g.state === SdmGoalState.approved)) {
        return SdmGoalState.approved;
    } else if (goals.some(g => g.state === SdmGoalState.requested)) {
        return SdmGoalState.requested;
    } else if (goals.some(g => g.state === SdmGoalState.planned)) {
        return SdmGoalState.planned;
    } else if (goals.some(g => g.state === SdmGoalState.skipped)) {
        return SdmGoalState.skipped;
    } else if (goals.every(g => g.state === SdmGoalState.success)) {
        return SdmGoalState.success;
    } else {
        const unknowns = goals.filter(g => g.state !== SdmGoalState.success).map(g => `${g.name}:${g.state}`);
        throw new Error("Unknown goal state(s): " + JSON.stringify(unknowns));
    }
}

function cleanPush(push: PushFields.Fragment): PushFields.Fragment {
    const newPush = _.cloneDeep(push);
    if (!!newPush && !!(newPush as any).goals) {
        delete (newPush as any).goals;
    }
    return newPush;
}