SimpleNotes/simplenotes-app/src/main/kotlin/be/simplenotes/app/controllers/NoteController.kt

package be.simplenotes.app.controllers

import be.simplenotes.app.extensions.html
import be.simplenotes.app.extensions.redirect
import be.simplenotes.app.utils.parseSearchTerms
import be.simplenotes.views.NoteView
import be.simplenotes.domain.usecases.NoteService
import be.simplenotes.domain.usecases.markdown.InvalidMeta
import be.simplenotes.domain.usecases.markdown.MissingMeta
import be.simplenotes.domain.usecases.markdown.ValidationError
import be.simplenotes.types.LoggedInUser
import org.http4k.core.Method
import org.http4k.core.Request
import org.http4k.core.Response
import org.http4k.core.Status.Companion.BAD_REQUEST
import org.http4k.core.Status.Companion.NOT_FOUND
import org.http4k.core.Status.Companion.OK
import org.http4k.core.body.form
import org.http4k.routing.path
import java.util.*
import kotlin.math.abs

class NoteController(
    private val view: NoteView,
    private val noteService: NoteService,
) {

    fun new(request: Request, loggedInUser: LoggedInUser): Response {
        if (request.method == Method.GET) return Response(OK).html(view.noteEditor(loggedInUser))

        val markdownForm = request.form("markdown") ?: ""

        return noteService.create(loggedInUser.userId, markdownForm).fold(
            {
                val html = when (it) {
                    MissingMeta -> view.noteEditor(loggedInUser, error = "Missing note metadata", textarea = markdownForm)
                    InvalidMeta -> view.noteEditor(loggedInUser, error = "Invalid note metadata", textarea = markdownForm)
                    is ValidationError -> view.noteEditor(
                        loggedInUser,
                        validationErrors = it.validationErrors,
                        textarea = markdownForm
                    )
                }
                Response(BAD_REQUEST).html(html)
            },
            {
                Response.redirect("/notes/${it.uuid}")
            }
        )
    }

    fun list(request: Request, loggedInUser: LoggedInUser): Response {
        val currentPage = request.query("page")?.toIntOrNull()?.let(::abs) ?: 1
        val tag = request.query("tag")
        val (pages, notes) = noteService.paginatedNotes(loggedInUser.userId, currentPage, tag = tag)
        val deletedCount = noteService.countDeleted(loggedInUser.userId)
        return Response(OK).html(view.notes(loggedInUser, notes, currentPage, pages, deletedCount, tag = tag))
    }

    fun search(request: Request, loggedInUser: LoggedInUser): Response {
        val query = request.form("search") ?: ""
        val terms = parseSearchTerms(query)
        val notes = noteService.search(loggedInUser.userId, terms)
        val deletedCount = noteService.countDeleted(loggedInUser.userId)
        return Response(OK).html(view.search(loggedInUser, notes, query, deletedCount))
    }

    fun note(request: Request, loggedInUser: LoggedInUser): Response {
        val noteUuid = request.uuidPath() ?: return Response(NOT_FOUND)

        if (request.method == Method.POST) {
            if (request.form("delete") != null) {
                return if (noteService.trash(loggedInUser.userId, noteUuid))
                    Response.redirect("/notes") // TODO: flash cookie to show success ?
                else
                    Response(NOT_FOUND) // TODO: show an error
            }
            if (request.form("public") != null) {
                if (!noteService.makePublic(loggedInUser.userId, noteUuid)) return Response(NOT_FOUND)
            } else if (request.form("private") != null) {
                if (!noteService.makePrivate(loggedInUser.userId, noteUuid)) return Response(NOT_FOUND)
            }
        }

        val note = noteService.find(loggedInUser.userId, noteUuid) ?: return Response(NOT_FOUND)
        return Response(OK).html(view.renderedNote(loggedInUser, note, shared = false))
    }

    fun public(request: Request, loggedInUser: LoggedInUser?): Response {
        val noteUuid = request.uuidPath() ?: return Response(NOT_FOUND)
        val note = noteService.findPublic(noteUuid) ?: return Response(NOT_FOUND)
        return Response(OK).html(view.renderedNote(loggedInUser, note, shared = true))
    }

    fun edit(request: Request, loggedInUser: LoggedInUser): Response {
        val noteUuid = request.uuidPath() ?: return Response(NOT_FOUND)
        val note = noteService.find(loggedInUser.userId, noteUuid) ?: return Response(NOT_FOUND)

        if (request.method == Method.GET) {
            return Response(OK).html(view.noteEditor(loggedInUser, textarea = note.markdown))
        }

        val markdownForm = request.form("markdown") ?: ""

        return noteService.update(loggedInUser.userId, note.uuid, markdownForm).fold(
            {
                val html = when (it) {
                    MissingMeta -> view.noteEditor(loggedInUser, error = "Missing note metadata", textarea = markdownForm)
                    InvalidMeta -> view.noteEditor(loggedInUser, error = "Invalid note metadata", textarea = markdownForm)
                    is ValidationError -> view.noteEditor(
                        loggedInUser,
                        validationErrors = it.validationErrors,
                        textarea = markdownForm
                    )
                }
                Response(BAD_REQUEST).html(html)
            },
            {
                Response.redirect("/notes/${note.uuid}")
            }
        )
    }

    fun trash(request: Request, loggedInUser: LoggedInUser): Response {
        val currentPage = request.query("page")?.toIntOrNull()?.let(::abs) ?: 1
        val tag = request.query("tag")
        val (pages, notes) = noteService.paginatedNotes(loggedInUser.userId, currentPage, tag = tag, deleted = true)
        return Response(OK).html(view.trash(loggedInUser, notes, currentPage, pages))
    }

    fun deleted(request: Request, loggedInUser: LoggedInUser): Response {
        val uuid = request.uuidPath() ?: return Response(NOT_FOUND)
        return if (request.form("delete") != null)
            if (noteService.delete(loggedInUser.userId, uuid))
                Response.redirect("/notes/trash")
            else
                Response(NOT_FOUND)
        else if (noteService.restore(loggedInUser.userId, uuid))
            Response.redirect("/notes/$uuid")
        else
            Response(NOT_FOUND)
    }

    private fun Request.uuidPath(): UUID? {
        val uuidPath = path("uuid")!!
        return try {
            UUID.fromString(uuidPath)!!
        } catch (e: IllegalArgumentException) {
            null
        }
    }
}