import HtmlWebpackPlugin from "html-webpack-plugin";
import HtmlInlineScriptPlugin from "html-inline-script-webpack-plugin";
import FaviconsWebpackPlugin from "favicons-webpack-plugin";
import { CleanWebpackPlugin } from "clean-webpack-plugin";
import WorkboxPlugin from "workbox-webpack-plugin";
import ReactRefreshTypeScript from "react-refresh-typescript";
import ReactRefreshWebpackPlugin from "@pmmmwh/react-refresh-webpack-plugin";
import webpack from "webpack";
import { execSync } from "child_process";
import path from "path";
import { fileURLToPath } from "url";
import {
    defineReactCompilerLoaderOption,
    reactCompilerLoader,
} from "react-compiler-webpack";

function parseChangelog() {
    return execSync('git log --grep "^Changelog: " -10')
        .toString()
        .split(/^commit /m)
        .slice(1)
        .map((commit) => {
            const changelogIndex = commit.indexOf("    Changelog: ");
            if (changelogIndex === -1) {
                throw `Changelog not found in commit:\n${commit}`;
            }
            const dateString = commit.match(/^Date:   (.*)$/m)?.[1];
            if (!dateString) {
                throw `Date not found in commit:\n${commit}`;
            }
            const dateValue = new Date(dateString);
            const date = dateValue.toISOString().split("T")[0];
            const id = commit.substring(0, commit.indexOf("\n"));
            const message = commit
                .substring(changelogIndex + 15)
                .replaceAll("\n    ", "\n")
                .trim();
            return {
                id,
                message,
                date,
            };
        })
        .filter((changelog) => changelog.message);
}

export default async (env, argv) => {
    const getContributorsForRepo = async (repoName) => {
        const contributorsData = await fetch(
            `https://api.github.com/repos/LiveSplit/${repoName}/contributors`,
            {
                headers: {
                    Authorization: env.GITHUB_TOKEN
                        ? `Bearer ${env.GITHUB_TOKEN}`
                        : undefined,
                },
            },
        );
        return contributorsData.json();
    };

    const lsoContributorsList = await getContributorsForRepo("LiveSplitOne");
    const coreContributorsList = await getContributorsForRepo("livesplit-core");

    const coreContributorsMap = {};
    for (const coreContributor of coreContributorsList) {
        if (
            coreContributor.type === "User" &&
            !coreContributor.login.includes("dependabot")
        ) {
            coreContributorsMap[coreContributor.login] = coreContributor;
        }
    }

    for (let lsoContributor of lsoContributorsList) {
        const existingContributor = coreContributorsMap[lsoContributor.login];
        if (existingContributor) {
            existingContributor.contributions += lsoContributor.contributions;
        } else if (
            lsoContributor.type === "User" &&
            !lsoContributor.login.includes("dependabot")
        ) {
            coreContributorsMap[lsoContributor.login] = lsoContributor;
        }
    }

    const contributorsList = Object.values(coreContributorsMap)
        // Sort by contributions, but fallback to alphabetical order for the
        // same amount of contributions
        .sort((a, b) => (a.login > b.login ? 1 : b.login > a.login ? -1 : 0))
        .sort((a, b) => b.contributions - a.contributions)
        .map((user) => {
            return { id: user.id, name: user.login };
        });
    const commitHash = execSync("git rev-parse --short HEAD").toString();
    const date = new Date()
        .toISOString()
        .replace("T", " ")
        .replace(/\..+/, " UTC");

    const changelog = parseChangelog();

    const basePath = path.dirname(fileURLToPath(import.meta.url));

    const isProduction = argv.mode === "production";
    const isTauri = env.TAURI === "true";
    const distPath = path.join(
        ...[
            basePath,
            ...(isTauri ? ["src-tauri", "target", "dist"] : ["dist"]),
        ],
    );

    return {
        entry: {
            bundle: ["./src/index.tsx"],
        },
        output: {
            filename: "[name].js",
            path: distPath,
            publicPath: "",
        },

        devtool: isProduction ? undefined : "source-map",

        devServer: {
            port: 8080,
            hot: true,
        },

        resolve: {
            extensions: [
                ".webpack.js",
                ".web.js",
                ".ts",
                ".tsx",
                ".js",
                ".json",
                ".wasm",
            ],
        },

        plugins: [
            ...(isProduction
                ? [
                      new CleanWebpackPlugin({
                          protectWebpackAssets: false,
                          cleanAfterEveryBuildPatterns: ["*.LICENSE.txt"],
                      }),
                  ]
                : []),
            ...(isTauri
                ? []
                : [
                      new FaviconsWebpackPlugin({
                          logo: path.resolve("src/assets/icon.svg"),
                          inject: true,
                          logoMaskable: path.resolve("src/assets/maskable.svg"),
                          favicons: {
                              appName: "LiveSplit One",
                              appDescription:
                                  "A version of LiveSplit that works on a lot of platforms.",
                              developerName: "CryZe",
                              developerURL: "https://livesplit.org",
                              background: "#171717",
                              theme_color: "#232323",
                              appleStatusBarStyle: "black-translucent",
                              icons: {
                                  appleIcon: {
                                      offset: 10,
                                  },
                                  appleStartup: {
                                      offset: 15,
                                  },
                                  windows: false,
                                  coast: false,
                                  yandex: false,
                              },
                              start_url: "/",
                          },
                      }),
                  ]),
            new HtmlWebpackPlugin({
                template: "./src/index.html",
            }),
            new webpack.DefinePlugin({
                BUILD_DATE: JSON.stringify(date),
                COMMIT_HASH: JSON.stringify(commitHash),
                CONTRIBUTORS_LIST: JSON.stringify(contributorsList),
                CHANGELOG: JSON.stringify(changelog),
            }),
            ...(isProduction
                ? [
                      new HtmlInlineScriptPlugin({
                          scriptMatchPattern: ["^bundle.js$"],
                      }),
                      ...(isTauri
                          ? []
                          : [
                                new WorkboxPlugin.GenerateSW({
                                    clientsClaim: true,
                                    skipWaiting: true,
                                    maximumFileSizeToCacheInBytes:
                                        100 * 1024 * 1024,
                                    exclude: [/^assets/, /\.LICENSE\.txt$/],

                                    runtimeCaching: [
                                        {
                                            urlPattern: (context) => {
                                                return (
                                                    self.origin ===
                                                        context.url.origin &&
                                                    context.url.pathname.startsWith(
                                                        "/assets/",
                                                    )
                                                );
                                            },
                                            handler: "CacheFirst",
                                        },
                                    ],
                                }),
                            ]),
                  ]
                : []),
            ...(!isProduction ? [new ReactRefreshWebpackPlugin()] : []),
        ],

        module: {
            rules: [
                {
                    test: /\.tsx?$/,
                    use: [
                        ...(isProduction
                            ? [
                                  {
                                      loader: reactCompilerLoader,
                                      options: defineReactCompilerLoaderOption({
                                          babelTransFormOpt: {
                                              plugins: [
                                                  "@babel/plugin-proposal-explicit-resource-management",
                                              ],
                                          },
                                      }),
                                  },
                              ]
                            : []),
                        {
                            loader: "ts-loader",
                            options: {
                                getCustomTransformers: () => ({
                                    before: [
                                        !isProduction &&
                                            ReactRefreshTypeScript(),
                                    ].filter(Boolean),
                                }),
                                transpileOnly: !isProduction,
                            },
                        },
                    ],
                    exclude: "/node_modules",
                },
                {
                    test: /\.(s?)css$/,
                    use: [
                        "style-loader",
                        {
                            loader: "css-loader",
                            options: {
                                importLoaders: 1,
                                modules: {
                                    auto: true,
                                    // In development mode, we want to know
                                    // which classes are being used in the DOM.
                                    localIdentName: isProduction
                                        ? "[hash:base64]"
                                        : "[name]_[local]_[hash:base64]",
                                },
                            },
                        },
                        "sass-loader",
                    ],
                },
                {
                    test: /\.(png|jpg|gif|woff|ico|svg)$/,
                    type: "asset/resource",
                },
            ],
        },

        mode: isProduction ? "production" : "development",
    };
};