// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

import * as fs from "fs-extra"
import * as path from "path"
import { LogLevel, Uri, WorkspaceFolder } from "vscode"
import { Trace } from "vscode-jsonrpc/node"
import { getWorkspaceFolders } from "./vscodeapi"

function logLevelToTrace(logLevel: LogLevel): Trace {
    switch (logLevel) {
        case LogLevel.Error:
        case LogLevel.Warning:
        case LogLevel.Info:
            return Trace.Messages

        case LogLevel.Debug:
        case LogLevel.Trace:
            return Trace.Verbose

        case LogLevel.Off:
        default:
            return Trace.Off
    }
}

export function getLSClientTraceLevel(channelLogLevel: LogLevel, globalLogLevel: LogLevel): Trace {
    if (channelLogLevel === LogLevel.Off) {
        return logLevelToTrace(globalLogLevel)
    }
    if (globalLogLevel === LogLevel.Off) {
        return logLevelToTrace(channelLogLevel)
    }
    const level = logLevelToTrace(
        channelLogLevel <= globalLogLevel ? channelLogLevel : globalLogLevel
    )
    return level
}

export async function getProjectRoot(): Promise<WorkspaceFolder> {
    const workspaces: readonly WorkspaceFolder[] = getWorkspaceFolders()
    if (workspaces.length === 0) {
        return {
            uri: Uri.file(process.cwd()),
            name: path.basename(process.cwd()),
            index: 0
        }
    } else if (workspaces.length === 1) {
        return workspaces[0]
    } else {
        let rootWorkspace = workspaces[0]
        let root = undefined
        for (const w of workspaces) {
            if (await fs.pathExists(w.uri.fsPath)) {
                root = w.uri.fsPath
                rootWorkspace = w
                break
            }
        }

        for (const w of workspaces) {
            if (root && root.length > w.uri.fsPath.length && (await fs.pathExists(w.uri.fsPath))) {
                root = w.uri.fsPath
                rootWorkspace = w
            }
        }
        return rootWorkspace
    }
}