import {
    combinePaths,
    Extension,
    fileExtensionIs,
    Path,
    ResolvedConfigFileName,
} from "./_namespaces/ts.js";

/** @internal */
export enum UpToDateStatusType {
    Unbuildable,
    UpToDate,
    /**
     * The project appears out of date because its upstream inputs are newer than its outputs,
     * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
     * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
     */
    UpToDateWithUpstreamTypes,
    OutputMissing,
    ErrorReadingFile,
    OutOfDateWithSelf,
    OutOfDateWithUpstream,
    OutOfDateBuildInfoWithPendingEmit,
    OutOfDateBuildInfoWithErrors,
    OutOfDateOptions,
    OutOfDateRoots,
    UpstreamOutOfDate,
    UpstreamBlocked,
    ComputingUpstream,
    TsVersionOutputOfDate,
    UpToDateWithInputFileText,

    /**
     * Projects with no outputs (i.e. "solution" files)
     */
    ContainerOnly,
    ForceBuild,
}

/** @internal */
export type UpToDateStatus =
    | Status.Unbuildable
    | Status.UpToDate
    | Status.OutputMissing
    | Status.ErrorReadingFile
    | Status.OutOfDateWithSelf
    | Status.OutOfDateWithUpstream
    | Status.OutOfDateBuildInfo
    | Status.OutOfDateRoots
    | Status.UpstreamOutOfDate
    | Status.UpstreamBlocked
    | Status.ComputingUpstream
    | Status.TsVersionOutOfDate
    | Status.ContainerOnly
    | Status.ForceBuild;

/** @internal */
export namespace Status {
    /**
     * The project can't be built at all in its current state. For example,
     * its config file cannot be parsed, or it has a syntax error or missing file
     */
    export interface Unbuildable {
        type: UpToDateStatusType.Unbuildable;
        reason: string;
    }

    /**
     * This project doesn't have any outputs, so "is it up to date" is a meaningless question.
     */
    export interface ContainerOnly {
        type: UpToDateStatusType.ContainerOnly;
    }

    /**
     * The project is up to date with respect to its inputs.
     * We track what the newest input file is.
     */
    export interface UpToDate {
        type:
            | UpToDateStatusType.UpToDate
            | UpToDateStatusType.UpToDateWithUpstreamTypes
            | UpToDateStatusType.UpToDateWithInputFileText;
        newestInputFileTime?: Date;
        newestInputFileName?: string;
        oldestOutputFileName: string;
    }

    /**
     * One or more of the outputs of the project does not exist.
     */
    export interface OutputMissing {
        type: UpToDateStatusType.OutputMissing;
        /**
         * The name of the first output file that didn't exist
         */
        missingOutputFileName: string;
    }

    /** Error reading file */
    export interface ErrorReadingFile {
        type: UpToDateStatusType.ErrorReadingFile;
        fileName: string;
    }

    /**
     * One or more of the project's outputs is older than its newest input.
     */
    export interface OutOfDateWithSelf {
        type: UpToDateStatusType.OutOfDateWithSelf;
        outOfDateOutputFileName: string;
        newerInputFileName: string;
    }

    /**
     * Buildinfo indicates that build is out of date
     */
    export interface OutOfDateBuildInfo {
        type:
            | UpToDateStatusType.OutOfDateBuildInfoWithPendingEmit
            | UpToDateStatusType.OutOfDateBuildInfoWithErrors
            | UpToDateStatusType.OutOfDateOptions;
        buildInfoFile: string;
    }

    export interface OutOfDateRoots {
        type: UpToDateStatusType.OutOfDateRoots;
        buildInfoFile: string;
        inputFile: Path;
    }

    /**
     * This project depends on an out-of-date project, so shouldn't be built yet
     */
    export interface UpstreamOutOfDate {
        type: UpToDateStatusType.UpstreamOutOfDate;
        upstreamProjectName: string;
    }

    /**
     * This project depends an upstream project with build errors
     */
    export interface UpstreamBlocked {
        type: UpToDateStatusType.UpstreamBlocked;
        upstreamProjectName: string;
        upstreamProjectBlocked: boolean;
    }

    /**
     *  Computing status of upstream projects referenced
     */
    export interface ComputingUpstream {
        type: UpToDateStatusType.ComputingUpstream;
    }

    export interface TsVersionOutOfDate {
        type: UpToDateStatusType.TsVersionOutputOfDate;
        version: string;
    }

    /**
     * One or more of the project's outputs is older than the newest output of
     * an upstream project.
     */
    export interface OutOfDateWithUpstream {
        type: UpToDateStatusType.OutOfDateWithUpstream;
        outOfDateOutputFileName: string;
        newerProjectName: string;
    }

    export interface ForceBuild {
        type: UpToDateStatusType.ForceBuild;
    }
}

/** @internal */
export function resolveConfigFileProjectName(project: string): ResolvedConfigFileName {
    if (fileExtensionIs(project, Extension.Json)) {
        return project as ResolvedConfigFileName;
    }

    return combinePaths(project, "tsconfig.json") as ResolvedConfigFileName;
}