import { DockgeServer } from "./dockge-server";
import fs, { promises as fsAsync } from "fs";
import { log } from "./log";
import yaml from "yaml";
import { DockgeSocket, fileExists, ValidationError } from "./util-server";
import path from "path";
import {
    acceptedComposeFileNames,
    COMBINED_TERMINAL_COLS,
    COMBINED_TERMINAL_ROWS,
    CREATED_FILE,
    CREATED_STACK,
    EXITED,
    getCombinedTerminalName,
    getComposeTerminalName,
    getContainerExecTerminalName,
    PROGRESS_TERMINAL_ROWS,
    RUNNING,
    TERMINAL_ROWS,
    UNKNOWN,
} from "../common/util-common";
import { InteractiveTerminal, Terminal } from "./terminal";
import childProcessAsync from "promisify-child-process";
import { Settings } from "./settings";
import { execSync } from "child_process";
import ini from "ini";

export class Stack {
    name: string;
    protected _status: number = UNKNOWN;
    protected _composeYAML?: string;
    protected _composeENV?: string;
    protected _configFilePath?: string;
    protected _composeFileName: string = "compose.yaml";
    protected server: DockgeServer;

    protected combinedTerminal?: Terminal;

    protected static managedStackList: Map<string, Stack> = new Map();

    constructor(
        server: DockgeServer,
        name: string,
        composeYAML?: string,
        composeENV?: string,
        skipFSOperations = false
    ) {
        this.name = name;
        this.server = server;
        this._composeYAML = composeYAML;
        this._composeENV = composeENV;

        if (!skipFSOperations) {
            // Check if compose file name is different from compose.yaml
            for (const filename of acceptedComposeFileNames) {
                if (fs.existsSync(path.join(this.path, filename))) {
                    this._composeFileName = filename;
                    break;
                }
            }
        }
    }

    async toJSON(endpoint: string): Promise<object> {
        // Since we have multiple agents now, embed primary hostname in the stack object too.
        let primaryHostname = await Settings.get("primaryHostname");
        if (!primaryHostname) {
            if (!endpoint) {
                primaryHostname = "localhost";
            } else {
                // Use the endpoint as the primary hostname
                try {
                    primaryHostname = new URL("https://" + endpoint).hostname;
                } catch (e) {
                    // Just in case if the endpoint is in a incorrect format
                    primaryHostname = "localhost";
                }
            }
        }

        let obj = this.toSimpleJSON(endpoint);
        return {
            ...obj,
            composeYAML: this.composeYAML,
            composeENV: this.composeENV,
            primaryHostname,
        };
    }

    toSimpleJSON(endpoint: string): object {
        return {
            name: this.name,
            status: this._status,
            tags: [],
            isManagedByDockge: this.isManagedByDockge,
            isGitRepo: this.isGitRepo,
            gitUrl: this.gitUrl,
            branch: this.branch,
            webhook: this.webhook,
            composeFileName: this._composeFileName,
            endpoint,
        };
    }

    /**
     * Get the status of the stack from `docker compose ps --format json`
     */
    async ps(): Promise<object> {
        let res = await childProcessAsync.spawn(
            "docker",
            ["compose", "ps", "--format", "json"],
            {
                cwd: this.path,
                encoding: "utf-8",
            }
        );
        if (!res.stdout) {
            return {};
        }
        return JSON.parse(res.stdout.toString());
    }

    get isManagedByDockge(): boolean {
        return fs.existsSync(this.path) && fs.statSync(this.path).isDirectory();
    }

    get isGitRepo(): boolean {
        try {
            execSync("git rev-parse --is-inside-work-tree", { cwd: this.path });
            return true;
        } catch (error) {
            return false;
        }
    }

    get gitUrl() : string {
        if (this.isGitRepo) {
            try {
                let stdout = execSync("git config --get remote.origin.url", { cwd: this.path });
                return stdout.toString().trim();
            } catch (error) {
                return "";
            }
        }
        return "";
    }

    get branch() : string {
        if (this.isGitRepo) {
            try {
                let stdout = execSync("git branch --show-current", { cwd: this.path });
                return stdout.toString().trim();
            } catch (error) {
                return "";
            }
        }
        return "";
    }

    get webhook() : string {
        //TODO: refine this.
        if (this.server.config.hostname) {
            return `http://${this.server.config.hostname}:${this.server.config.port}/webhook/update/${encodeURIComponent(this.name)}`;
        } else {
            return `http://localhost:${this.server.config.port}/webhook/update/${encodeURIComponent(this.name)}`;
        }
    }

    get status(): number {
        return this._status;
    }

    validate() {
        // Check name, allows [a-z][0-9] _ - only
        if (!this.name.match(/^[a-z0-9_-]+$/)) {
            throw new ValidationError(
                "Stack name can only contain [a-z][0-9] _ - only"
            );
        }

        // Check YAML format
        yaml.parse(this.composeYAML);

        let lines = this.composeENV.split("\n");

        // Check if the .env is able to pass docker-compose
        // Prevent "setenv: The parameter is incorrect"
        // It only happens when there is one line and it doesn't contain "="
        if (
            lines.length === 1 &&
            !lines[0].includes("=") &&
            lines[0].length > 0
        ) {
            throw new ValidationError("Invalid .env format");
        }
    }

    get composeYAML(): string {
        if (this._composeYAML === undefined) {
            try {
                this._composeYAML = fs.readFileSync(
                    path.join(this.path, this._composeFileName),
                    "utf-8"
                );
            } catch (e) {
                this._composeYAML = "";
            }
        }
        return this._composeYAML;
    }

    get composeENV(): string {
        if (this._composeENV === undefined) {
            try {
                this._composeENV = fs.readFileSync(
                    path.join(this.path, ".env"),
                    "utf-8"
                );
            } catch (e) {
                this._composeENV = "";
            }
        }
        return this._composeENV;
    }

    get path(): string {
        return path.join(this.server.stacksDir, this.name);
    }

    get fullPath(): string {
        let dir = this.path;

        // Compose up via node-pty
        let fullPathDir;

        // if dir is relative, make it absolute
        if (!path.isAbsolute(dir)) {
            fullPathDir = path.join(process.cwd(), dir);
        } else {
            fullPathDir = dir;
        }
        return fullPathDir;
    }

    /**
     * Save the stack to the disk
     * @param isAdd
     */
    async save(isAdd: boolean) {
        this.validate();

        let dir = this.path;

        // Check if the name is used if isAdd
        if (isAdd) {
            if (await fileExists(dir)) {
                throw new ValidationError("Stack name already exists");
            }

            // Create the stack folder
            await fsAsync.mkdir(dir);
        } else {
            if (!(await fileExists(dir))) {
                throw new ValidationError("Stack not found");
            }
        }

        // Write or overwrite the compose.yaml
        await fsAsync.writeFile(
            path.join(dir, this._composeFileName),
            this.composeYAML
        );

        const envPath = path.join(dir, ".env");

        // Write or overwrite the .env
        // If .env is not existing and the composeENV is empty, we don't need to write it
        if ((await fileExists(envPath)) || this.composeENV.trim() !== "") {
            await fsAsync.writeFile(envPath, this.composeENV);
        }
    }

    async deploy(socket: DockgeSocket): Promise<number> {
        const terminalName = getComposeTerminalName(socket.endpoint, this.name);
        let exitCode = await Terminal.exec(
            this.server,
            socket,
            terminalName,
            "docker",
            ["compose", "up", "-d", "--remove-orphans"],
            this.path
        );
        if (exitCode !== 0) {
            throw new Error(
                "Failed to deploy, please check the terminal output for more information."
            );
        }
        return exitCode;
    }

    async delete(socket: DockgeSocket): Promise<number> {
        const terminalName = getComposeTerminalName(socket.endpoint, this.name);
        let exitCode = await Terminal.exec(
            this.server,
            socket,
            terminalName,
            "docker",
            ["compose", "down", "--remove-orphans"],
            this.path
        );
        if (exitCode !== 0) {
            throw new Error(
                "Failed to delete, please check the terminal output for more information."
            );
        }

        // Remove the stack folder
        await fsAsync.rm(this.path, {
            recursive: true,
            force: true,
        });

        return exitCode;
    }

    async updateStatus() {
        let statusList = await Stack.getStatusList();
        let status = statusList.get(this.name);

        if (status) {
            this._status = status;
        } else {
            this._status = UNKNOWN;
        }
    }

    /**
     * Checks if a compose file exists in the specified directory.
     * @async
     * @static
     * @param {string} dir - The directory to search.
     * @returns {Promise<boolean>} A promise that resolves to a boolean indicating whether any compose file exists.
     */
    static async composeFileExists(dir: string): Promise<boolean> {
        // Check if any compose file exists
        for (const filename of acceptedComposeFileNames) {
            let composeFile = path.join(dir, filename);
            if (await fileExists(composeFile)) {
                return true;
            }
        }
        return false;
    }

    static async getStackList(
        server: DockgeServer,
        useCacheForManaged = false,
        depth = 0,
        dir = ""
    ): Promise<Map<string, Stack>> {
        let stacksDir = server.stacksDir;
        let currentDir = dir ? path.join(stacksDir, dir) : stacksDir;
        let stackList: Map<string, Stack>;

        // Use cached stack list?
        if (useCacheForManaged && this.managedStackList.size > 0) {
            stackList = this.managedStackList;
        } else {
            stackList = new Map<string, Stack>();

            // Scan the stacks directory, and get the stack list
            let filenameList = await fsAsync.readdir(currentDir);

            for (let filename of filenameList) {
                try {
                    // Check if it is a directory
                    let stat = await fsAsync.stat(
                        path.join(currentDir, filename)
                    );
                    if (!stat.isDirectory()) {
                        continue;
                    }
                    // If no compose file exists, skip it
                    if (
                        !(await Stack.composeFileExists(
                            path.join(currentDir, filename)
                        ))
                    ) {
                        if (depth >= 3) {
                            continue;
                        } else {
                            let subStackList = await this.getStackList(
                                server,
                                useCacheForManaged,
                                depth + 1,
                                path.join(dir, filename)
                            );
                            for (let [subFilename, subStack] of subStackList) {
                                stackList.set(subFilename, subStack);
                            }
                            continue;
                        }
                    }
                    let stack = await this.getStack(
                        server,
                        path.join(dir, filename)
                    );
                    stack._status = CREATED_FILE;
                    stackList.set(path.join(dir, filename), stack);
                } catch (e) {
                    if (e instanceof Error) {
                        log.warn(
                            "getStackList",
                            `Failed to get stack ${filename}, error: ${e.message}`
                        );
                    }
                }
            }

            // Cache by copying
            this.managedStackList = new Map(stackList);
        }

        // Get status from docker compose ls
        let res = await childProcessAsync.spawn(
            "docker",
            ["compose", "ls", "--all", "--format", "json"],
            {
                encoding: "utf-8",
            }
        );

        if (!res.stdout) {
            return stackList;
        }

        let composeList = JSON.parse(res.stdout.toString());

        for (let composeStack of composeList) {
            let stackName = composeStack.Name;

            // Adjust the stack name based on the config file path
            // Get the first config file path
            let configFile = composeStack.ConfigFiles.split(",")[0];
            // Just use the stack name if the config file path is not in the stacks directory
            if (configFile.trim().startsWith(server.stacksDir) && acceptedComposeFileNames.some(file => configFile.trim().endsWith(file))) {
                const relativePath = path.relative(server.stacksDir, configFile.trim());
                const match = relativePath.match(new RegExp("^(.+)/(.+)\\.ya?ml$"));
                if (match) {
                    stackName = match[1];
                }
            }

            let stack = stackList.get(stackName);

            // This stack probably is not managed by Dockge, but we still want to show it
            if (!stack) {
                // Skip the dockge stack if it is not managed by Dockge
                if (composeStack.Name === "dockge") {
                    continue;
                }
                stack = new Stack(server, stackName);
                stackList.set(stackName, stack);
            }

            stack._status = this.statusConvert(composeStack.Status);
            stack._configFilePath = composeStack.ConfigFiles;
        }

        return stackList;
    }

    /**
     * Get the status list, it will be used to update the status of the stacks
     * Not all status will be returned, only the stack that is deployed or created to `docker compose` will be returned
     */
    static async getStatusList(): Promise<Map<string, number>> {
        let statusList = new Map<string, number>();

        let res = await childProcessAsync.spawn(
            "docker",
            ["compose", "ls", "--all", "--format", "json"],
            {
                encoding: "utf-8",
            }
        );

        if (!res.stdout) {
            return statusList;
        }

        let composeList = JSON.parse(res.stdout.toString());

        for (let composeStack of composeList) {
            statusList.set(
                composeStack.Name,
                this.statusConvert(composeStack.Status)
            );
        }

        return statusList;
    }

    /**
     * Convert the status string from `docker compose ls` to the status number
     * Input Example: "exited(1), running(1)"
     * @param status
     */
    static statusConvert(status: string): number {
        if (status.startsWith("created")) {
            return CREATED_STACK;
        } else if (status.includes("exited")) {
            // If one of the service is exited, we consider the stack is exited
            return EXITED;
        } else if (status.startsWith("running")) {
            // If there is no exited services, there should be only running services
            return RUNNING;
        } else {
            return UNKNOWN;
        }
    }

    static async getStack(
        server: DockgeServer,
        stackName: string,
        skipFSOperations = false
    ): Promise<Stack> {
        let dir = path.join(server.stacksDir, stackName);

        if (!skipFSOperations) {
            if (
                !(await fileExists(dir)) ||
                !(await fsAsync.stat(dir)).isDirectory()
            ) {
                // Maybe it is a stack managed by docker compose directly
                let stackList = await this.getStackList(server, true);
                let stack = stackList.get(stackName);

                if (stack) {
                    return stack;
                } else {
                    // Really not found
                    throw new ValidationError("Stack not found");
                }
            }
        } else {
            //log.debug("getStack", "Skip FS operations");
        }

        let stack: Stack;

        if (!skipFSOperations) {
            stack = new Stack(server, stackName);
        } else {
            stack = new Stack(server, stackName, undefined, undefined, true);
        }

        stack._status = UNKNOWN;
        stack._configFilePath = path.resolve(dir);
        return stack;
    }

    async start(socket: DockgeSocket) {
        const terminalName = getComposeTerminalName(socket.endpoint, this.name);
        let exitCode = await Terminal.exec(
            this.server,
            socket,
            terminalName,
            "docker",
            ["compose", "up", "-d", "--remove-orphans"],
            this.path
        );
        if (exitCode !== 0) {
            throw new Error(
                "Failed to start, please check the terminal output for more information."
            );
        }
        return exitCode;
    }

    async stop(socket: DockgeSocket): Promise<number> {
        const terminalName = getComposeTerminalName(socket.endpoint, this.name);
        let exitCode = await Terminal.exec(
            this.server,
            socket,
            terminalName,
            "docker",
            ["compose", "stop"],
            this.path
        );
        if (exitCode !== 0) {
            throw new Error(
                "Failed to stop, please check the terminal output for more information."
            );
        }
        return exitCode;
    }

    async restart(socket: DockgeSocket): Promise<number> {
        const terminalName = getComposeTerminalName(socket.endpoint, this.name);
        let exitCode = await Terminal.exec(
            this.server,
            socket,
            terminalName,
            "docker",
            ["compose", "restart"],
            this.path
        );
        if (exitCode !== 0) {
            throw new Error(
                "Failed to restart, please check the terminal output for more information."
            );
        }
        return exitCode;
    }

    async down(socket: DockgeSocket): Promise<number> {
        const terminalName = getComposeTerminalName(socket.endpoint, this.name);
        let exitCode = await Terminal.exec(
            this.server,
            socket,
            terminalName,
            "docker",
            ["compose", "down"],
            this.path
        );
        if (exitCode !== 0) {
            throw new Error(
                "Failed to down, please check the terminal output for more information."
            );
        }
        return exitCode;
    }

    async update(socket: DockgeSocket) {
        const terminalName = getComposeTerminalName(socket.endpoint, this.name);

        if (this.isGitRepo) {
            // TODO: error handling e.g. local changes
            let exitCode = await Terminal.exec(
                this.server,
                socket,
                terminalName,
                "git",
                ["pull"],
                this.path
            );
            if (exitCode !== 0) {
                throw new Error(
                    "Failed to update, please check the terminal output for more information."
                );
            }
        }

        let exitCode = await Terminal.exec(
            this.server,
            socket,
            terminalName,
            "docker",
            ["compose", "pull"],
            this.path
        );
        if (exitCode !== 0) {
            throw new Error(
                "Failed to pull, please check the terminal output for more information."
            );
        }

        // If the stack is not running, we don't need to restart it
        await this.updateStatus();
        log.debug("update", "Status: " + this.status);
        if (this.status !== RUNNING) {
            return exitCode;
        }

        exitCode = await Terminal.exec(
            this.server,
            socket,
            terminalName,
            "docker",
            ["compose", "up", "-d", "--remove-orphans"],
            this.path
        );
        if (exitCode !== 0) {
            throw new Error(
                "Failed to restart, please check the terminal output for more information."
            );
        }
        return exitCode;
    }

    async gitSync(socket?: DockgeSocket) {
        const terminalName = socket ? getComposeTerminalName(socket.endpoint, this.name) : "";

        if (!this.isGitRepo) {
            throw new Error("This stack is not a git repository");
        }

        let exitCode = await Terminal.exec(this.server, socket, terminalName, "git", [ "pull", "--strategy-option", "theirs" ], this.path);
        if (exitCode !== 0) {
            throw new Error("Failed to sync, please check the terminal output for more information.");
        }

        // If the stack is not running, we don't need to restart it
        await this.updateStatus();
        log.debug("update", "Status: " + this.status);
        if (this.status !== RUNNING) {
            return exitCode;
        }

        exitCode = await Terminal.exec(this.server, socket, terminalName, "docker", [ "compose", "up", "-d", "--remove-orphans" ], this.path);
        if (exitCode !== 0) {
            throw new Error("Failed to restart, please check the terminal output for more information.");
        }
        return exitCode;
    }

    checkRemoteChanges() {
        return new Promise((resolve, reject) => {
            if (!this.isGitRepo) {
                reject("This stack is not a git repository");
                return;
            }
            //fetch remote changes and check if the current branch is behind
            try {
                const stdout = execSync("git fetch origin && git status -uno", { cwd: this.path }).toString();
                if (stdout.includes("Your branch is behind")) {
                    resolve(true);
                } else {
                    resolve(false);
                }
            } catch (error) {
                log.error("checkRemoteChanges", error);
                reject("Failed to check local status");
                return;
            }
        });
    }

    async joinCombinedTerminal(socket: DockgeSocket) {
        const terminalName = getCombinedTerminalName(
            socket.endpoint,
            this.name
        );
        const terminal = Terminal.getOrCreateTerminal(
            this.server,
            terminalName,
            "docker",
            ["compose", "logs", "-f", "--tail", "100"],
            this.path
        );
        terminal.enableKeepAlive = true;
        terminal.rows = COMBINED_TERMINAL_ROWS;
        terminal.cols = COMBINED_TERMINAL_COLS;
        terminal.join(socket);
        terminal.start();
    }

    async leaveCombinedTerminal(socket: DockgeSocket) {
        const terminalName = getCombinedTerminalName(
            socket.endpoint,
            this.name
        );
        const terminal = Terminal.getTerminal(terminalName);
        if (terminal) {
            terminal.leave(socket);
        }
    }

    async joinContainerTerminal(
        socket: DockgeSocket,
        serviceName: string,
        shell: string = "sh",
        index: number = 0
    ) {
        const terminalName = getContainerExecTerminalName(
            socket.endpoint,
            this.name,
            serviceName,
            index
        );
        let terminal = Terminal.getTerminal(terminalName);

        if (!terminal) {
            terminal = new InteractiveTerminal(
                this.server,
                terminalName,
                "docker",
                ["compose", "exec", serviceName, shell],
                this.path
            );
            terminal.rows = TERMINAL_ROWS;
            log.debug("joinContainerTerminal", "Terminal created");
        }

        terminal.join(socket);
        terminal.start();
    }

    async getServiceStatusList() {
        let statusList = new Map<string, number>();

        try {
            let res = await childProcessAsync.spawn(
                "docker",
                ["compose", "ps", "--format", "json"],
                {
                    cwd: this.path,
                    encoding: "utf-8",
                }
            );

            if (!res.stdout) {
                return statusList;
            }

            let lines = res.stdout?.toString().split("\n");

            for (let line of lines) {
                try {
                    let obj = JSON.parse(line);
                    if (obj.Health === "") {
                        statusList.set(obj.Service, obj.State);
                    } else {
                        statusList.set(obj.Service, obj.Health);
                    }
                } catch (e) {}
            }

            return statusList;
        } catch (e) {
            log.error("getServiceStatusList", e);
            return statusList;
        }
    }
}