import pathUtil from 'path'
import globby from '@sprucelabs/globby'
import {
    EventContract,
    EventSignature,
    PermissionContract,
    SpruceSchemas,
    validateEventContract,
} from '@sprucelabs/mercury-types'
import { Schema, validateSchema } from '@sprucelabs/schema'
import {
    eventResponseUtil,
    eventDiskUtil,
    eventNameUtil,
    buildEmitTargetAndPayloadSchema,
    eventContractUtil,
} from '@sprucelabs/spruce-event-utils'
import { diskUtil, namesUtil } from '@sprucelabs/spruce-skill-utils'
import { cloneDeep } from 'lodash'
import SpruceError from '../../../errors/SpruceError'
import AbstractStore from '../../../stores/AbstractStore'
import { InternalUpdateHandler } from '../../../types/cli.types'
import { eventContractCleanerUtil } from '../../../utilities/eventContractCleaner.utility'

export default class EventStore extends AbstractStore {
    public name = 'event'
    protected static contractCache: Record<string, any> = {}
    private static localEventCache?: SpruceSchemas.Mercury.v2020_12_25.EventContract

    public static clearCache() {
        EventStore.localEventCache = undefined
        EventStore.contractCache = {}
    }

    public async fetchEventContracts(
        options?: FetchContractsOptions
    ): Promise<EventStoreFetchEventContractsResponse> {
        const {
            localNamespace,
            didUpdateHandler,
            namespaces,
            shouldOnlySyncRemoteEvents,
        } = options ?? {}

        didUpdateHandler?.('Pulling remote contracts...')

        let contracts
        try {
            contracts = await this.fetchRemoteContracts(namespaces)
        } catch (err: any) {
            const error = err.options?.responseErrors?.[0] ?? err
            throw error
        }

        if (shouldOnlySyncRemoteEvents) {
            return {
                contracts,
                errors: [],
            }
        }

        const localContract =
            localNamespace &&
            (await this.loadLocalContract(localNamespace, didUpdateHandler))

        if (localNamespace) {
            this.filterOutLocalEventsFromRemoteContractsMutating(
                contracts,
                localNamespace
            )
        }

        if (localContract) {
            contracts.push(localContract)
        }

        return {
            contracts,
            errors: [],
        }
    }

    private async fetchRemoteContracts(namespaces?: string[]) {
        const key = namespaces?.join('|') ?? '_'

        if (!EventStore.contractCache[key]) {
            const client = await this.connectToApi({
                shouldAuthAsCurrentSkill: true,
            })

            const [{ contracts }] = await client.emitAndFlattenResponses(
                'get-event-contracts::v2020_12_25',
                {
                    target: {
                        namespaces,
                    },
                }
            )

            EventStore.contractCache[key] = contracts
        }

        return cloneDeep(EventStore.contractCache[key])
    }

    private filterOutLocalEventsFromRemoteContractsMutating(
        remoteContracts: EventContract[],
        localNamespace: string
    ) {
        const ns = namesUtil.toKebab(localNamespace)

        for (const contract of remoteContracts) {
            const sigs = eventContractUtil.getNamedEventSignatures(contract)
            for (const sig of sigs) {
                if (sig.eventNamespace === ns) {
                    delete contract.eventSignatures[sig.fullyQualifiedEventName]
                }
            }
        }
    }

    public async loadLocalContract(
        localNamespace: string,
        didUpdateHandler?: InternalUpdateHandler
    ): Promise<EventContract | null> {
        if (EventStore.localEventCache) {
            return EventStore.localEventCache
        }

        const localMatches = await globby(
            this.generateGlobbyForLocalEvents() as any
        )

        const ns = namesUtil.toKebab(localNamespace)
        const eventSignatures: Record<string, EventSignature> = {}
        const filesByFqenAndEventKey: {
            fqen: string
            isSchema: boolean
            match: string
            eventKey: string
        }[] = []

        didUpdateHandler?.(
            `Importing ${localMatches.length} local event signature files...`
        )

        await Promise.all(
            localMatches.map(async (match) => {
                let fqen: string | undefined
                let eventKey: keyof EventImport | undefined

                try {
                    const { eventName, version } =
                        eventDiskUtil.splitPathToEvent(match)
                    fqen = eventNameUtil.join({
                        eventName,
                        version,
                        eventNamespace: ns,
                    })

                    const filename = pathUtil.basename(
                        match
                    ) as keyof typeof eventFileNamesImportKeyMap

                    const map = eventFileNamesImportKeyMap[filename]

                    if (map) {
                        //@ts-ignore
                        eventKey = map.key

                        filesByFqenAndEventKey.push({
                            fqen,
                            isSchema: map.isSchema,
                            match,
                            eventKey: eventKey as string,
                        })
                    }
                } catch (err: any) {
                    throw new SpruceError({
                        code: 'INVALID_EVENT_CONTRACT',
                        fullyQualifiedEventName: fqen ?? 'Bad event name',
                        brokenProperty: eventKey ?? '*** major failure ***',
                        originalError: err,
                    })
                }
            })
        )

        const matches = filesByFqenAndEventKey.map((o) => o.match)
        const importsInOrder = (await this.Service('import').bulkImport(
            matches
        )) as Record<string, any>[]
        const importsByName: Record<string, EventImport> = {}

        for (let idx = 0; idx < filesByFqenAndEventKey.length; idx++) {
            const imported = importsInOrder[idx]
            const { fqen, eventKey, isSchema } = filesByFqenAndEventKey[idx]

            if (isSchema) {
                try {
                    validateSchema(imported)
                } catch (err: any) {
                    throw new SpruceError({
                        code: 'INVALID_EVENT_CONTRACT',
                        fullyQualifiedEventName: fqen,
                        brokenProperty: eventKey,
                        originalError: err,
                    })
                }
            }

            if (!importsByName[fqen]) {
                importsByName[fqen] = {}
            }

            //@ts-ignore
            importsByName[fqen][eventKey] = imported
        }

        Object.keys(importsByName).forEach((fqen) => {
            const imported = importsByName[fqen]
            const { eventName } = eventNameUtil.split(fqen)
            eventSignatures[fqen] = {
                emitPayloadSchema: buildEmitTargetAndPayloadSchema({
                    eventName,
                    payloadSchema: imported.emitPayload,
                    targetSchema: imported.emitTarget,
                }),
                responsePayloadSchema: imported.responsePayload,
                emitPermissionContract: imported.emitPermissions,
                listenPermissionContract: imported.listenPermissions,
                ...imported.options,
            }
        })

        didUpdateHandler?.(
            `Loaded ${Object.keys(eventSignatures).length} local event signatures...`
        )

        if (Object.keys(eventSignatures).length > 0) {
            const cleaned =
                eventContractCleanerUtil.cleanPayloadsAndPermissions({
                    eventSignatures,
                })

            validateEventContract(cleaned)

            EventStore.localEventCache = cleaned

            return cleaned
        }

        return null
    }

    private generateGlobbyForLocalEvents(): string | readonly string[] {
        return diskUtil.resolvePath(
            this.cwd,
            'src',
            '**',
            'events',
            '**/*.(builder|options).ts'
        )
    }

    public async registerEventContract(options: {
        eventContract: EventContract
    }) {
        const client = await this.connectToApi({
            shouldAuthAsCurrentSkill: true,
        })

        const results = await client.emit('register-events::v2020_12_25', {
            payload: {
                contract: options.eventContract,
            },
        })

        eventResponseUtil.getFirstResponseOrThrow(results)

        EventStore.contractCache = {}

        return results
    }

    public async unRegisterEvents(
        options: SpruceSchemas.Mercury.v2020_12_25.UnregisterEventsEmitPayload
    ) {
        const client = await this.connectToApi({
            shouldAuthAsCurrentSkill: true,
        })

        const results = await client.emit('unregister-events::v2020_12_25', {
            payload: options,
        })

        eventResponseUtil.getFirstResponseOrThrow(results)

        EventStore.contractCache = {}
    }
}

export interface EventStoreFetchEventContractsResponse {
    errors: SpruceError[]
    contracts: EventContract[]
}

type Options = Omit<
    EventSignature,
    | 'responsePayloadSchema'
    | 'emitPayloadSchema'
    | 'listenPermissionContract'
    | 'emitPermissionContract'
>

interface EventImport {
    options?: Options
    emitPayload?: Schema
    emitTarget?: Schema
    responsePayload?: Schema
    emitPermissions?: PermissionContract
    listenPermissions?: PermissionContract
}

const eventFileNamesImportKeyMap = {
    'event.options.ts': { key: 'options', isSchema: false },
    'emitPayload.builder.ts': { key: 'emitPayload', isSchema: true },
    'emitTarget.builder.ts': { key: 'emitTarget', isSchema: true },
    'responsePayload.builder.ts': { key: 'responsePayload', isSchema: true },
    'emitPermissions.builder.ts': { key: 'emitPermissions', isSchema: false },
    'listenPermissions.builder.ts': {
        key: 'listenPermissions',
        isSchema: false,
    },
}

export interface FetchContractsOptions {
    localNamespace?: string
    namespaces?: string[]
    didUpdateHandler?: InternalUpdateHandler
    shouldOnlySyncRemoteEvents?: boolean
}