import becca from "../becca/becca.js";
import utils from "../services/utils.js";
import eu from "./etapi_utils.js";
import mappers from "./mappers.js";
import noteService from "../services/notes.js";
import TaskContext from "../services/task_context.js";
import v from "./validators.js";
import searchService from "../services/search/services/search.js";
import SearchContext from "../services/search/search_context.js";
import zipExportService from "../services/export/zip.js";
import zipImportService from "../services/import/zip.js";
import { Router } from 'express';
import { AppRequest } from '../routes/route-interface';
import { ParsedQs } from 'qs';
import { NoteParams } from '../services/note-interface';
import BNote from "../becca/entities/bnote.js";
import { SearchParams } from '../services/search/services/types';
import { ValidatorMap } from './etapi-interface';

function register(router: Router) {
    eu.route(router, 'get', '/etapi/notes', (req, res, next) => {
        const { search } = req.query;

        if (typeof search !== "string" || !search?.trim()) {
            throw new eu.EtapiError(400, 'SEARCH_QUERY_PARAM_MANDATORY', "'search' query parameter is mandatory.");
        }

        const searchParams = parseSearchParams(req);
        const searchContext = new SearchContext(searchParams);

        const searchResults = searchService.findResultsWithQuery(search, searchContext);
        const foundNotes = searchResults.map(sr => becca.notes[sr.noteId]);

        const resp: any = {
            results: foundNotes.map(note => mappers.mapNoteToPojo(note)),
        };

        if (searchContext.debugInfo) {
            resp.debugInfo = searchContext.debugInfo;
        }

        res.json(resp);
    });

    eu.route(router, 'get', '/etapi/notes/:noteId', (req, res, next) => {
        const note = eu.getAndCheckNote(req.params.noteId);

        res.json(mappers.mapNoteToPojo(note));
    });

    const ALLOWED_PROPERTIES_FOR_CREATE_NOTE: ValidatorMap = {
        'parentNoteId': [v.mandatory, v.notNull, v.isNoteId],
        'title': [v.mandatory, v.notNull, v.isString],
        'type': [v.mandatory, v.notNull, v.isNoteType],
        'mime': [v.notNull, v.isString],
        'content': [v.notNull, v.isString],
        'notePosition': [v.notNull, v.isInteger],
        'prefix': [v.notNull, v.isString],
        'isExpanded': [v.notNull, v.isBoolean],
        'noteId': [v.notNull, v.isValidEntityId],
        'dateCreated': [v.notNull, v.isString, v.isLocalDateTime],
        'utcDateCreated': [v.notNull, v.isString, v.isUtcDateTime]
    };

    eu.route(router, 'post', '/etapi/create-note', (req, res, next) => {
        const _params = {};
        eu.validateAndPatch(_params, req.body, ALLOWED_PROPERTIES_FOR_CREATE_NOTE);
        const params = _params as NoteParams;

        try {
            const resp = noteService.createNewNote(params);

            res.status(201).json({
                note: mappers.mapNoteToPojo(resp.note),
                branch: mappers.mapBranchToPojo(resp.branch)
            });
        }
        catch (e: any) {
            return eu.sendError(res, 500, eu.GENERIC_CODE, e.message);
        }
    });

    const ALLOWED_PROPERTIES_FOR_PATCH = {
        'title': [v.notNull, v.isString],
        'type': [v.notNull, v.isString],
        'mime': [v.notNull, v.isString],
        'dateCreated': [v.notNull, v.isString, v.isLocalDateTime],
        'utcDateCreated': [v.notNull, v.isString, v.isUtcDateTime]
    };

    eu.route(router, 'patch', '/etapi/notes/:noteId', (req, res, next) => {
        const note = eu.getAndCheckNote(req.params.noteId);

        if (note.isProtected) {
            throw new eu.EtapiError(400, "NOTE_IS_PROTECTED", `Note '${req.params.noteId}' is protected and cannot be modified through ETAPI.`);
        }

        eu.validateAndPatch(note, req.body, ALLOWED_PROPERTIES_FOR_PATCH);
        note.save();

        res.json(mappers.mapNoteToPojo(note));
    });

    eu.route(router, 'delete', '/etapi/notes/:noteId', (req, res, next) => {
        const { noteId } = req.params;

        const note = becca.getNote(noteId);

        if (!note) {
            return res.sendStatus(204);
        }

        note.deleteNote(null, new TaskContext('no-progress-reporting'));

        res.sendStatus(204);
    });

    eu.route(router, 'get', '/etapi/notes/:noteId/content', (req, res, next) => {
        const note = eu.getAndCheckNote(req.params.noteId);

        if (note.isProtected) {
            throw new eu.EtapiError(400, "NOTE_IS_PROTECTED", `Note '${req.params.noteId}' is protected and content cannot be read through ETAPI.`);
        }

        const filename = utils.formatDownloadTitle(note.title, note.type, note.mime);

        res.setHeader('Content-Disposition', utils.getContentDisposition(filename));

        res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
        res.setHeader('Content-Type', note.mime);

        res.send(note.getContent());
    });

    eu.route(router, 'put', '/etapi/notes/:noteId/content', (req, res, next) => {
        const note = eu.getAndCheckNote(req.params.noteId);

        if (note.isProtected) {
            throw new eu.EtapiError(400, "NOTE_IS_PROTECTED", `Note '${req.params.noteId}' is protected and cannot be modified through ETAPI.`);
        }

        note.setContent(req.body);

        noteService.asyncPostProcessContent(note, req.body);

        return res.sendStatus(204);
    });

    eu.route(router, 'get', '/etapi/notes/:noteId/export', (req, res, next) => {
        const note = eu.getAndCheckNote(req.params.noteId);
        const format = req.query.format || "html";

        if (typeof format !== "string" || !["html", "markdown"].includes(format)) {
            throw new eu.EtapiError(400, "UNRECOGNIZED_EXPORT_FORMAT", `Unrecognized export format '${format}', supported values are 'html' (default) or 'markdown'.`);
        }

        const taskContext = new TaskContext('no-progress-reporting');

        // technically a branch is being exported (includes prefix), but it's such a minor difference yet usability pain
        // (e.g. branchIds are not seen in UI), that we export "note export" instead.
        const branch = note.getParentBranches()[0];

        zipExportService.exportToZip(taskContext, branch, format as "html" | "markdown", res);
    });

    eu.route(router, 'post', '/etapi/notes/:noteId/import', (req, res, next) => {
        const note = eu.getAndCheckNote(req.params.noteId);
        const taskContext = new TaskContext('no-progress-reporting');

        zipImportService.importZip(taskContext, req.body, note).then(importedNote => {
            res.status(201).json({
                note: mappers.mapNoteToPojo(importedNote),
                branch: mappers.mapBranchToPojo(importedNote.getParentBranches()[0]),
            });
        }); // we need better error handling here, async errors won't be properly processed.
    });

    eu.route(router, 'post', '/etapi/notes/:noteId/revision', (req, res, next) => {
        const note = eu.getAndCheckNote(req.params.noteId);

        note.saveRevision();

        return res.sendStatus(204);
    });

    eu.route(router, 'get', '/etapi/notes/:noteId/attachments', (req, res, next) => {
        const note = eu.getAndCheckNote(req.params.noteId);
        const attachments = note.getAttachments({ includeContentLength: true })

        res.json(
            attachments.map(attachment => mappers.mapAttachmentToPojo(attachment))
        );
    });
}

function parseSearchParams(req: AppRequest) {
    const rawSearchParams: SearchParams = {
        fastSearch: parseBoolean(req.query, 'fastSearch'),
        includeArchivedNotes: parseBoolean(req.query, 'includeArchivedNotes'),
        ancestorNoteId: parseString(req.query['ancestorNoteId']),
        ancestorDepth: parseString(req.query['ancestorDepth']), // e.g. "eq5"
        orderBy: parseString(req.query['orderBy']),
        // TODO: Check why the order direction was provided as a number, but it's a string everywhere else.
        orderDirection: parseOrderDirection(req.query, 'orderDirection') as unknown as string,
        limit: parseInteger(req.query, 'limit'),
        debug: parseBoolean(req.query, 'debug')
    };

    const searchParams: SearchParams = {};

    for (const paramName of Object.keys(rawSearchParams) as (keyof SearchParams)[]) {
        if (rawSearchParams[paramName] !== undefined) {
            (searchParams as any)[paramName] = rawSearchParams[paramName];
        }
    }

    return searchParams;
}

const SEARCH_PARAM_ERROR = "SEARCH_PARAM_VALIDATION_ERROR";

function parseString(value: string | ParsedQs | string[] | ParsedQs[] | undefined): string | undefined {
    if (typeof value === "string") {
        return value;
    }

    return undefined;
}

function parseBoolean(obj: any, name: string) {
    if (!(name in obj)) {
        return undefined;
    }

    if (!['true', 'false'].includes(obj[name])) {
        throw new eu.EtapiError(400, SEARCH_PARAM_ERROR, `Cannot parse boolean '${name}' value '${obj[name]}, allowed values are 'true' and 'false'.`);
    }

    return obj[name] === 'true';
}

function parseOrderDirection(obj: any, name: string) {
    if (!(name in obj)) {
        return undefined;
    }

    const integer = parseInt(obj[name]);

    if (!['asc', 'desc'].includes(obj[name])) {
        throw new eu.EtapiError(400, SEARCH_PARAM_ERROR, `Cannot parse order direction value '${obj[name]}, allowed values are 'asc' and 'desc'.`);
    }

    return integer;
}

function parseInteger(obj: any, name: string) {
    if (!(name in obj)) {
        return undefined;
    }

    const integer = parseInt(obj[name]);

    if (Number.isNaN(integer)) {
        throw new eu.EtapiError(400, SEARCH_PARAM_ERROR, `Cannot parse integer '${name}' value '${obj[name]}'.`);
    }

    return integer;
}

export default {
    register
};