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

import {
    ConfigurationChangeEvent,
    ConfigurationScope,
    WorkspaceConfiguration,
    WorkspaceFolder
} from "vscode"
import { getInterpreterDetails } from "./python"
import { getConfiguration, getWorkspaceFolders } from "./vscodeapi"

export interface ISettings {
    cwd: string
    workspace: string
    args: string[]
    path: string[]
    interpreter: string[]
    importStrategy: string
    showNotifications: string
    formatter: boolean
    inlayHint: boolean
    inlayHints: {
        parameterNames: "all" | "literals" | "none"
        suppressWhenArgumentMatchesName: boolean
    }
}

export function getExtensionSettings(
    namespace: string,
    includeInterpreter?: boolean
): Promise<ISettings[]> {
    return Promise.all(
        getWorkspaceFolders().map((w) => getWorkspaceSettings(namespace, w, includeInterpreter))
    )
}

function resolveVariables(value: string[], workspace?: WorkspaceFolder): string[] {
    const substitutions = new Map<string, string>()
    const home = process.env.HOME || process.env.USERPROFILE
    if (home) {
        substitutions.set("${userHome}", home)
    }
    if (workspace) {
        substitutions.set("${workspaceFolder}", workspace.uri.fsPath)
    }
    substitutions.set("${cwd}", process.cwd())
    getWorkspaceFolders().forEach((w) => {
        substitutions.set("${workspaceFolder:" + w.name + "}", w.uri.fsPath)
    })

    return value.map((s) => {
        for (const [key, value] of substitutions) {
            s = s.replace(key, value)
        }
        return s
    })
}

export function getInterpreterFromSetting(namespace: string, scope?: ConfigurationScope) {
    const config = getConfiguration(namespace, scope)
    return config.get<string[]>("interpreter")
}

export async function getWorkspaceSettings(
    namespace: string,
    workspace: WorkspaceFolder,
    includeInterpreter?: boolean
): Promise<ISettings> {
    const config = getConfiguration(namespace, workspace.uri)

    let interpreter: string[] = []
    if (includeInterpreter) {
        interpreter = getInterpreterFromSetting(namespace, workspace) ?? []
        if (interpreter.length === 0) {
            interpreter = (await getInterpreterDetails(workspace.uri)).path ?? []
        }
    }

    const workspaceSetting = {
        cwd: workspace.uri.fsPath,
        workspace: workspace.uri.toString(),
        args: resolveVariables(config.get<string[]>(`args`) ?? [], workspace),
        path: resolveVariables(config.get<string[]>(`path`) ?? [], workspace),
        interpreter: resolveVariables(interpreter, workspace),
        importStrategy: config.get<string>(`importStrategy`) ?? "useBundled",
        showNotifications: config.get<string>(`showNotifications`) ?? "off",
        formatter: config.get<boolean>(`formatter`) ?? true,
        inlayHint: config.get<boolean>(`inlayHint`) ?? true,
        inlayHints: {
            parameterNames:
                config.get<"all" | "literals" | "none">(`inlayHints.parameterNames`) ?? "all",
            suppressWhenArgumentMatchesName:
                config.get<boolean>(`inlayHints.suppressWhenArgumentMatchesName`) ?? true
        }
    }
    return workspaceSetting
}

function getGlobalValue<T>(config: WorkspaceConfiguration, key: string, defaultValue: T): T {
    const inspect = config.inspect<T>(key)
    return inspect?.globalValue ?? inspect?.defaultValue ?? defaultValue
}

export async function getGlobalSettings(
    namespace: string,
    includeInterpreter?: boolean
): Promise<ISettings> {
    const config = getConfiguration(namespace)

    let interpreter: string[] = []
    if (includeInterpreter) {
        interpreter = getGlobalValue<string[]>(config, "interpreter", [])
        if (interpreter === undefined || interpreter.length === 0) {
            interpreter = (await getInterpreterDetails()).path ?? []
        }
    }

    const setting = {
        cwd: process.cwd(),
        workspace: process.cwd(),
        args: getGlobalValue<string[]>(config, "args", []),
        path: getGlobalValue<string[]>(config, "path", []),
        interpreter: interpreter,
        importStrategy: getGlobalValue<string>(config, "importStrategy", "useBundled"),
        showNotifications: getGlobalValue<string>(config, "showNotifications", "off"),
        formatter: config.get<boolean>(`formatter`) ?? true,
        inlayHint: config.get<boolean>(`inlayHint`) ?? true,
        inlayHints: {
            parameterNames:
                config.get<"all" | "literals" | "none">(`inlayHints.parameterNames`) ?? "all",
            suppressWhenArgumentMatchesName:
                config.get<boolean>(`inlayHints.suppressWhenArgumentMatchesName`) ?? true
        }
    }
    return setting
}

export function checkIfConfigurationChanged(
    e: ConfigurationChangeEvent,
    namespace: string
): boolean {
    const settings = [
        `${namespace}.args`,
        `${namespace}.path`,
        `${namespace}.interpreter`,
        `${namespace}.importStrategy`,
        `${namespace}.showNotifications`,
        `${namespace}.formatter`,
        `${namespace}.inlayHint`,
        `${namespace}.inlayHints.parameterNames`,
        `${namespace}.inlayHints.suppressWhenArgumentMatchesName`
    ]
    const changed = settings.map((s) => e.affectsConfiguration(s))
    return changed.includes(true)
}