#!/usr/bin/env node

import { createInterface } from "node:readline/promises";
import { stdin, stdout, stderr } from "node:process";
import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
import { join } from "node:path";
import { Command } from "commander";
import envPaths from "env-paths";
import { Client, type ClientSnapshot } from "../src/client.js";
import { init } from "../src/crypto/index.js";
import { runBackup } from "../src/backup.js";

const paths = envPaths("quak", { suffix: "" });
const sessionPath = join(paths.data, "session.json");

const loadSession = (): ClientSnapshot | null => {
    if (!existsSync(sessionPath)) return null;
    try {
        return JSON.parse(readFileSync(sessionPath, "utf-8")) as ClientSnapshot;
    } catch {
        return null;
    }
};

const saveSession = (snapshot: ClientSnapshot): void => {
    mkdirSync(paths.data, { recursive: true, mode: 0o700 });
    writeFileSync(sessionPath, JSON.stringify(snapshot, null, 2), {
        mode: 0o600,
    });
};

const requireSession = (): Client => {
    const snapshot = loadSession();
    if (!snapshot) {
        stderr.write(
            `Not logged in. Run "quak login" first.\nSession file: ${sessionPath}\n`,
        );
        process.exit(1);
    }
    return Client.fromJSON(snapshot);
};

const prompt = async (message: string): Promise<string> => {
    const rl = createInterface({ input: stdin, output: stderr });
    const answer = await rl.question(message);
    rl.close();
    return answer;
};

const promptPassword = async (message: string): Promise<string> => {
    if (!stdin.isTTY) {
        return prompt(message);
    }
    stderr.write(message);
    stdin.setRawMode(true);
    stdin.resume();
    const chars: string[] = [];
    return new Promise((resolve) => {
        const onData = (buf: Buffer) => {
            for (const byte of buf) {
                if (byte === 3) {
                    stdin.setRawMode(false);
                    process.exit(130);
                }
                if (byte === 13 || byte === 10) {
                    stdin.setRawMode(false);
                    stdin.removeListener("data", onData);
                    stdin.pause();
                    stderr.write("\n");
                    resolve(chars.join(""));
                    return;
                }
                if (byte === 127 || byte === 8) {
                    chars.pop();
                } else {
                    chars.push(String.fromCharCode(byte));
                }
            }
        };
        stdin.on("data", onData);
    });
};

const program = new Command();

program
    .name("quak")
    .description("CLI for the Ente end-to-end encrypted photo service")
    .version("0.0.0");

program
    .command("login")
    .description("Log in to an Ente account and save the session")
    .action(async () => {
        await init();
        const email =
            process.env.QUAK_EMAIL ??
            (stdin.isTTY ? await prompt("Email: ") : null);
        const password =
            process.env.QUAK_PASSWORD ??
            (stdin.isTTY ? await promptPassword("Password: ") : null);
        if (!email || !password) {
            stderr.write(
                "Set QUAK_EMAIL and QUAK_PASSWORD env vars for non-interactive use.\n",
            );
            process.exit(1);
        }

        stderr.write("Authenticating...\n");
        try {
            const client = await Client.login({
                email,
                password,
                totp: async () => prompt("TOTP code: "),
                emailOTP: async () => prompt("Email verification code: "),
            });

            saveSession(client.toJSON());
            const info = client.whoami();
            stderr.write(`Logged in as ${info.email} (user ${info.userID})\n`);
            stderr.write(`Session saved to ${sessionPath}\n`);
        } catch (err) {
            stderr.write(
                `Login failed: ${err instanceof Error ? err.message : err}\n`,
            );
            process.exit(1);
        }
    });

program
    .command("whoami")
    .description("Print the logged-in account")
    .action(() => {
        const client = requireSession();
        const info = client.whoami();
        stdout.write(JSON.stringify(info) + "\n");
    });

program
    .command("logout")
    .description("Delete the saved session")
    .action(async () => {
        if (existsSync(sessionPath)) {
            const { unlinkSync } = await import("node:fs");
            unlinkSync(sessionPath);
            stderr.write("Session deleted.\n");
        } else {
            stderr.write("No session found.\n");
        }
    });

program
    .command("collections")
    .description("List all collections (albums)")
    .option("--json", "Output as JSON array")
    .action(async (opts: { json?: boolean }) => {
        await init();
        const client = requireSession();
        const collections = await client.listCollections();

        if (opts.json) {
            stdout.write(
                JSON.stringify(
                    collections.map((c) => ({
                        id: c.id,
                        name: c.name,
                        type: c.type,
                        ownerID: c.ownerID,
                        isShared: c.isShared,
                        updationTime: c.updationTime,
                    })),
                    null,
                    2,
                ) + "\n",
            );
        } else {
            for (const c of collections) {
                stdout.write(
                    `${c.id}\t${c.type}\t${c.name}${c.isShared ? " (shared)" : ""}\n`,
                );
            }
        }
    });

program
    .command("files")
    .description("List files in a collection")
    .requiredOption(
        "--collection <id>",
        "Collection ID (from `quak collections`)",
    )
    .option("--json", "Output as JSON array")
    .action(async (opts: { collection: string; json?: boolean }) => {
        await init();
        const client = requireSession();
        const collectionID = Number(opts.collection);
        if (!Number.isFinite(collectionID)) {
            stderr.write("Invalid collection ID\n");
            process.exit(1);
        }

        const collections = await client.listCollections();
        const col = collections.find((c) => c.id === collectionID);
        if (!col) {
            stderr.write(`Collection ${collectionID} not found\n`);
            process.exit(1);
        }

        const files = await client.listFiles(col.id, col.key);

        if (opts.json) {
            stdout.write(
                JSON.stringify(
                    files.map((f) => ({
                        id: f.id,
                        title: f.metadata.title,
                        fileType: f.metadata.fileType,
                        creationTime: f.metadata.creationTime,
                        collectionID: f.collectionID,
                    })),
                    null,
                    2,
                ) + "\n",
            );
        } else {
            for (const f of files) {
                stdout.write(
                    `${f.id}\t${f.metadata.fileType}\t${f.metadata.title}\n`,
                );
            }
        }
    });

program
    .command("get")
    .description("Download and decrypt a single file")
    .argument("<fileID>", "File ID (from `quak files`)")
    .option("--out <path>", "Output file path")
    .option(
        "--collection <id>",
        "Collection ID (required to look up the file key)",
    )
    .action(
        async (
            fileIDStr: string,
            opts: { out?: string; collection?: string },
        ) => {
            await init();
            const client = requireSession();
            const fileID = Number(fileIDStr);
            if (!Number.isFinite(fileID)) {
                stderr.write("Invalid file ID\n");
                process.exit(1);
            }

            const collections = await client.listCollections();
            let targetCol;
            if (opts.collection) {
                targetCol = collections.find(
                    (c) => c.id === Number(opts.collection),
                );
            }

            // Search all collections (or the specified one) for the file
            const searchCols = targetCol ? [targetCol] : collections;
            for (const col of searchCols) {
                const files = await client.listFiles(col.id, col.key);
                const file = files.find((f) => f.id === fileID);
                if (file) {
                    const result = await client.downloadFile(file, opts.out);
                    stderr.write(
                        `${result.bytesWritten} bytes -> ${result.path}\n`,
                    );
                    return;
                }
            }
            stderr.write(`File ${fileID} not found\n`);
            process.exit(1);
        },
    );

program
    .command("get-thumb")
    .description("Download and decrypt a thumbnail")
    .argument("<fileID>", "File ID (from `quak files`)")
    .option("--out <path>", "Output file path")
    .option(
        "--collection <id>",
        "Collection ID (required to look up the file key)",
    )
    .action(
        async (
            fileIDStr: string,
            opts: { out?: string; collection?: string },
        ) => {
            await init();
            const client = requireSession();
            const fileID = Number(fileIDStr);
            if (!Number.isFinite(fileID)) {
                stderr.write("Invalid file ID\n");
                process.exit(1);
            }

            const collections = await client.listCollections();
            let targetCol;
            if (opts.collection) {
                targetCol = collections.find(
                    (c) => c.id === Number(opts.collection),
                );
            }

            const searchCols = targetCol ? [targetCol] : collections;
            for (const col of searchCols) {
                const files = await client.listFiles(col.id, col.key);
                const file = files.find((f) => f.id === fileID);
                if (file) {
                    const result = await client.downloadThumbnail(
                        file,
                        opts.out,
                    );
                    stderr.write(
                        `${result.bytesWritten} bytes -> ${result.path}\n`,
                    );
                    return;
                }
            }
            stderr.write(`File ${fileID} not found\n`);
            process.exit(1);
        },
    );

program
    .command("backup")
    .description(
        "Download all photos to a local directory, organized by collection",
    )
    .argument("<dir>", "Output directory")
    .option("--json", "Print result as JSON instead of human-readable summary")
    .action(async (dir: string, opts: { json?: boolean }) => {
        await init();
        const client = requireSession();

        stderr.write("Starting backup...\n");
        const result = await runBackup(client, dir, (msg) => {
            if (!opts.json) stderr.write(msg + "\n");
        });

        if (opts.json) {
            stdout.write(JSON.stringify(result, null, 2) + "\n");
        } else {
            stderr.write("\n--- Backup complete ---\n");
            stderr.write(`  Total files: ${result.totalFiles}\n`);
            stderr.write(`  Downloaded:  ${result.downloaded}\n`);
            stderr.write(`  Skipped:     ${result.skipped}\n`);
            stderr.write(`  Failed:      ${result.failed}\n`);
            if (result.errors.length > 0) {
                stderr.write("\nFailed files:\n");
                for (const e of result.errors) {
                    stderr.write(
                        `  [${e.collection}] ${e.title} (id ${e.fileID}): ${e.error}\n`,
                    );
                }
            }
        }

        process.exit(result.failed > 0 ? 1 : 0);
    });

program.parse();