package com.restapi.controllers

import com.fasterxml.jackson.core.JsonParser
import com.fasterxml.jackson.databind.DeserializationContext
import com.fasterxml.jackson.databind.JsonDeserializer
import com.fasterxml.jackson.databind.JsonNode
import com.fasterxml.jackson.databind.annotation.JsonDeserialize
import com.restapi.domain.*
import com.restapi.domain.Product
import com.restapi.domain.PurchaseOrder
import com.restapi.domain.Quotation
import com.restapi.domain.Session.currentUser
import com.restapi.domain.Session.database
import com.restapi.domain.Session.findDataModelByEntityAndUniqId
import com.restapi.domain.Vendor
import com.restapi.integ.Scripting
import io.ebean.CallableSql
import io.ebean.RawSqlBuilder
import io.javalin.http.*
import org.slf4j.LoggerFactory
import java.sql.Types
import java.time.LocalDate
import java.time.LocalDateTime
import java.time.LocalTime
import java.time.format.DateTimeFormatter

enum class QueryParamType {
    STRING, NUMBER, DATETIME, DATE
}


data class RawQuery(
    val sql: String,
    val params: Map<String, QueryParam>
)

data class QueryById(
    val params: List<QueryParam>
)

@JsonDeserialize(using = QueryByIdParamsDeSerializer::class)
sealed class QueryParam {
    data class Simple(val simple: String) : QueryParam()
    data class Complex(val type: QueryParamType, val value: String) : QueryParam() {
        fun getValueComplex(): Any {
            return when (type) {
                QueryParamType.STRING -> value
                QueryParamType.NUMBER -> if (value.matches(Regex("\\d+"))) value.toLong() else value.toDouble()
                QueryParamType.DATETIME -> LocalDateTime.parse(
                    value,
                    DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
                )

                QueryParamType.DATE -> LocalDate.parse(value, DateTimeFormatter.ofPattern("yyyy-MM-dd"))
            }
        }
    }

    fun getValue(): Any {
        return when (this) {
            is Complex -> getValueComplex()
            is Simple -> simple
        }
    }
}

class QueryByIdParamsDeSerializer : JsonDeserializer<QueryParam>() {
    override fun deserialize(p: JsonParser, ctxt: DeserializationContext?): QueryParam {
        val node = p.readValueAsTree<JsonNode>()
        return if (node.isTextual) {
            QueryParam.Simple(node.asText())
        } else {
            QueryParam.Complex(
                QueryParamType.valueOf(node.get("type").textValue()),
                node.get("value").textValue(),
            )
        }
    }

}

enum class ResultType {
    INTEGER, DECIMAL, STRING, DATETIME, ARRAY, OBJECT
}

data class RejectAction(val reason: String)
data class StoredProcedure(val input: Map<String, Any>, val output: Map<String, ResultType> = hashMapOf())

object Entities {
    private val logger = LoggerFactory.getLogger("Entities")
    fun delete(ctx: Context) {
        val e = database.findDataModelByEntityAndUniqId(ctx.pathParam("entity"), ctx.pathParam("id"))
        e.deletedBy = Session.currentUser()
        e.deletedOn = LocalDateTime.now()
        e.update()
        e.delete()
    }

    fun patch(ctx: Context) {
        val e = database.findDataModelByEntityAndUniqId(ctx.pathParam("entity"), ctx.pathParam("id"))
        val pv = ctx.bodyAsClass<Map<String, Any>>()
        pv.forEach { (key, value) ->
            e.data[key] = value;
        }

        e.update()
    }

    fun update(ctx: Context) {
        val purgeExisting = ctx.queryParam("purge")?.toBooleanStrictOrNull() == true
        val e = database.findDataModelByEntityAndUniqId(ctx.pathParam("entity"), ctx.pathParam("id"))

        val newData = ctx.bodyAsClass<Map<String, Any>>()
        if (purgeExisting) {
            e.data.clear();
        }
        e.data.putAll(newData)

        e.update()
    }

    fun action(ctx: Context) {}
    fun approve(ctx: Context) {
        approveOrReject(ctx, ApprovalStatus.APPROVED)
    }

    fun reject(ctx: Context) {
        approveOrReject(ctx, ApprovalStatus.REJECTED)
    }

    private fun approveOrReject(ctx: Context, rejected: ApprovalStatus) {
        val e = database.findDataModelByEntityAndUniqId(ctx.pathParam("entity"), ctx.pathParam("id"))
        val reject = ctx.bodyAsClass<RejectAction>()
        e.approvalStatus = rejected
        e.comments.add(Comments(text = reject.reason, by = currentUser()))
        e.save()
    }

    fun executeScript(ctx: Context) {
        val name = ctx.pathParam("name")
        val file = ctx.pathParam("file")
        val params = ctx.bodyAsClass<Map<String, Any>>()
        ctx.json(
            Scripting.execute(file, name, params)
        )
    }

    fun executeStoredProcedure(ctx: Context) {
        val name = ctx.pathParam("name")
        val sp = ctx.bodyAsClass<StoredProcedure>()

        val inputParams = sp.input.entries.toList()
        val outputParams = sp.output.entries.toList()

        val placeholders = (0..inputParams.size + 1).joinToString(",") { "?" }

        val sql = "{call $name($placeholders)}"
        val cs: CallableSql = database.createCallableSql(sql)

        inputParams.forEachIndexed { index, entry ->
            cs.setParameter(index + 1, entry.value)
        }
        cs.setParameter(inputParams.size + 1, Session.currentTenant())

        outputParams.forEachIndexed { idx, entry ->
            when (entry.value) {
                ResultType.INTEGER -> cs.registerOut(idx + 1, Types.INTEGER)
                ResultType.DECIMAL -> cs.registerOut(idx + 1, Types.DOUBLE)
                ResultType.STRING -> cs.registerOut(idx + 1, Types.VARCHAR)
                ResultType.DATETIME -> cs.registerOut(idx + 1, Types.DATE)
                ResultType.ARRAY -> cs.registerOut(idx + 1, Types.ARRAY)
                ResultType.OBJECT -> cs.registerOut(idx + 1, Types.JAVA_OBJECT)
            }

        }
        val done = database.execute(cs)
        val output = outputParams.mapIndexed { index, entry ->
            Pair(entry.key, cs.getObject(index + 1))
        }.toMap()

        ctx.json(
            mapOf(
                "done" to done,
                "output" to output
            )
        )
    }

    fun sqlQueryRaw(ctx: Context) {
        val sql = ctx.bodyAsClass<RawQuery>()
        logger.warn("running sql ${sql.sql}, with params ${sql.params}")
        ctx.json(
            database.find(DataModel::class.java)
                .setRawSql(
                    RawSqlBuilder.parse(sql.sql).create()
                ).apply {
                    sql.params.forEach { (t, u) ->
                        setParameter(t, u.getValue())
                    }
                }
                .findList()
        )

    }

    fun sqlQueryById(ctx: Context) {
        val sql = ctx.bodyAsClass<QueryById>()
        val sqlId = ctx.pathParam("id")
        logger.warn("running sqlId $sqlId, with params ${sql.params}")

        val entity = ctx.pathParam("entity")
        val query = database.find(SqlModel::class.java)
            .where()
            .eq("entityName", entity)
            .eq("sqlId", sqlId)
            .findOne() ?: throw NotFoundResponse("sql not found for $entity, $sqlId")

        ctx.json(
            database.find(DataModel::class.java)
                .setRawSql(RawSqlBuilder.parse(query.sql).create())
                .apply {
                    sql.params.forEachIndexed { index, entry ->
                        setParameter(index + 1, entry.getValue())
                    }
                }
                .findList()
        )

    }

    fun view(it: Context) {
        database.save(
            AuditLog().apply {
                auditType = AuditType.VIEW
                entity = it.pathParam("entity")
                uniqueIdentifier = it.pathParam("id")
            }
        )
        it.json(
            database.findDataModelByEntityAndUniqId(it.pathParam("entity"), it.pathParam("id"))
        )
    }

    fun create(ctx: Context) {

        val entity = ctx.pathParam("entity")


        //may be approval flow is configured?
        val setupEntity = database.find(EntityModel::class.java)
            .where()
            .eq("name", entity)
            .findOne()

        Session.creatSeq(entity)
        val dataModel = ctx.bodyAsClass<DataModel>().apply {
            this.entityName = entity
            if (this.uniqueIdentifier.isEmpty()) {
                this.uniqueIdentifier = Session.nextUniqId(entity)
            }
            this.approvalStatus = ApprovalStatus.APPROVED
        }

        database.save(
            dataModel.apply {
                if (setupEntity != null) {

                    val allowedFields = setupEntity.allowedFields.map { it.lowercase() }
                    if (allowedFields.isNotEmpty()) {

                        val moreFields =
                            dataModel.data.keys.map { it.lowercase() }.filter { !allowedFields.contains(it) }

                        if (moreFields.isNotEmpty()) {
                            logger.warn("Data Keys = ${dataModel.data.keys} is more than $allowedFields, extra fields = $moreFields")
                            throw BadRequestResponse("data contains more fields than allowed")
                        }

                        setupEntity.allowedFieldTypes.forEach { (key, expectedType) ->

                            val valueFromUser = dataModel.data[key] ?: return@forEach
                            val isDate = expectedType.equals("date", ignoreCase = true)
                            val isDateTime = expectedType.equals("datetime", ignoreCase = true)
                            val isTime = expectedType.equals("time", ignoreCase = true)
                            if (isDate || isDateTime || isTime) {
                                //this should be a string of a particular format
                                if (valueFromUser !is String) {
                                    throw BadRequestResponse("field $key, is of type ${valueFromUser.javaClass.simpleName} expected $expectedType")
                                } else {
                                    val dtPattern = Regex("^\\d{4}-\\d{2}-\\d{2}$")
                                    val dtmPattern = Regex("^\\d{4}-\\d{2}-\\d{2}\\s\\d{2}:\\d{2}$")
                                    val timePattern = Regex("^\\d{2}:\\d{2}$")


                                    if (isDate
                                        && !dtPattern.matches(valueFromUser)
                                        && !isValidDate(valueFromUser)
                                    ) {
                                        throw BadRequestResponse("field $key, is of type ${valueFromUser.javaClass.simpleName} expected $expectedType")
                                    }


                                    if (isDateTime
                                        && !dtmPattern.matches(valueFromUser)
                                        && !isValidDateTime(valueFromUser)
                                    ) {
                                        throw BadRequestResponse("field $key, is of type ${valueFromUser.javaClass.simpleName} expected $expectedType")
                                    }

                                    if (isTime
                                        && !timePattern.matches(valueFromUser)
                                        && !isValidTime(valueFromUser)
                                    ) {
                                        throw BadRequestResponse("field $key, is of type ${valueFromUser.javaClass.simpleName} expected $expectedType")
                                    }
                                }
                            }
                            if (valueFromUser.javaClass.simpleName != expectedType) {
                                throw BadRequestResponse("field $key, is of type ${valueFromUser.javaClass.simpleName} expected $expectedType")
                            }
                        }
                    }
                    if (!setupEntity.preSaveScript.isNullOrEmpty()) {
                        val ok = Scripting.execute(setupEntity.preSaveScript!!, "preSave", this) as Boolean
                        if (!ok) {
                            throw BadRequestResponse("PreSave Failed")
                        }
                    }

                    if (setupEntity.approvalLevels > 0) {

                        this.approvalStatus = ApprovalStatus.PENDING
                        this.requiredApprovalLevels = setupEntity.approvalLevels
                    }

                }
            }
        )

        if (setupEntity != null && !setupEntity.postSaveScript.isNullOrEmpty()) {
            Scripting.execute(setupEntity.postSaveScript!!, "postSave", dataModel)
        }


        database.save(
            AuditLog().apply {
                auditType = AuditType.CREATE
                this.entity = entity
                uniqueIdentifier = dataModel.uniqueIdentifier
                this.data = dataModel.data
            }
        )
    }

    private fun isValidDate(f: String) = try {
        LocalDate.parse(f, DateTimeFormatter.ofPattern("yyyy-MM-dd"))
        true
    } catch (e: Exception) {
        false
    }

    private fun isValidDateTime(f: String) = try {
        LocalDateTime.parse(f, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"))
        true
    } catch (e: Exception) {
        false
    }

    private fun isValidTime(f: String) = try {
        LocalTime.parse(f, DateTimeFormatter.ofPattern("HH:mm"))
        true
    } catch (e: Exception) {
        false
    }
}
data class Filters(val common :CommonFilters, val custom :CustomFilters)
object PurchaseOrder {
    fun get(ctx :Context){
        val id = ctx.pathParam("id")
        val po = database.find(PurchaseOrder::class.java, id) ?: throw NotFoundResponse("po not found for $id")

        ctx.json(po)
    }
    fun getAll(ctx :Context){
        val filters = ctx.bodyAsClass<Filters>()
        val poFilters :POFilters? = filters.custom as? POFilters
        val pos = searchPos(filters.common, poFilters)
        ctx.json(pos)
    }
    fun create(ctx :Context){
        val po = ctx.bodyAsClass<PurchaseOrder>()
        database.save(po)
        ctx.result("po created")
    }
    fun approve(ctx :Context){
        val id = ctx.pathParam("id")
        val po = database.find(PurchaseOrder::class.java, id) ?: throw NotFoundResponse("po not found for $id")
        po.approvalStatus = ApprovalStatus.APPROVED
        po.save()
        ctx.result("po with id $id approved")
        //reject all other pos pertaining to the same tx ??
    }
    fun reject(ctx :Context){
        val id = ctx.pathParam("id")
        val po = database.find(PurchaseOrder::class.java, id) ?: throw NotFoundResponse("po not found for $id")
        po.approvalStatus = ApprovalStatus.REJECTED
        po.save()
        ctx.result("po with id $id rejected")
    }
    fun quoteReference(ctx :Context){
        //gets the quote reference on which this po is based on
        val id = ctx.pathParam("id")
        val quote = database.find(Quotation::class.java)
            .where()
            .eq("referenceQuotation", id)
            ?: throw NotFoundResponse("reference quotation not found for po $id")
        ctx.json(quote)
    }
}

data class ProductSearch(
    var isSort: String? = null

)

object ProductCtrl {
    fun get(ctx :Context){
        val hsnCode = ctx.pathParam("hsnCode")
        val product = database.find(Product::class.java, hsnCode) ?: throw NotFoundResponse("Product not found for $hsnCode")

        ctx.json(product)
    }
    fun getAll(ctx: Context){
        val productList = Session.database.find(Product::class.java)
            .findList()
            .sortedBy { it.hsnCode }

        ctx.json(productList)
    }
    fun create(ctx :Context){
        val product = ctx.bodyAsClass<Product>()
        database.save(product)
    }

    fun delete(ctx: Context) {
        val id = ctx.pathParam("id")
        val product = database.delete(Product::class.java, id)
    }

    fun patch(ctx: Context) {

    }

    fun update(ctx: Context) {
        val id = ctx.pathParam("id")

    }
}

object Quotation {
    fun get(ctx :Context){
        val id = ctx.pathParam("id")
        val quote  = database.find(Quotation::class.java, id) ?: throw NotFoundResponse("quote not found for $id")
        ctx.json(quote)
    }
    fun create(ctx :Context){
        val quote = ctx.bodyAsClass<Quotation>()
        //we have to check if the quotation created date is below the expiry of rfq
        val rfq = database.find(com.restapi.domain.ReqForQuote::class.java)
            .where()
            .eq("reqForQuoteNum", quote.reqForQuoteNum)
            .findOne()
        if(rfq != null){
           //compare dates
            if(quote.quoteDate!! <= rfq.openTill) {
                //valid
                database.save(quote)
                ctx.result("quote created")
            }else {
                ctx.result("request for quote closed")
            }
        }else {
            throw NotFoundResponse("request for quote not found for this quotation")
        }

    }
    fun delete(ctx :Context){
        val id = ctx.pathParam("id")
        val quote  = database.find(Quotation::class.java, id) ?: throw NotFoundResponse("quote not found for id $id")
        quote.delete()
        ctx.result("quote with $id deleted")
    }
    fun generatePO(ctx :Context){
        //user should be redirected to a po form submission with prefilled values
        //create a PO object with values from the quote and then send it as body to vendor/po/create ??

    }
    fun reqForQuote(ctx :Context){
        val reqForQuoteNum  = ctx.pathParam(("rfqNum"))
        val rfq = database.find(RequestForQuote::class.java)
                .where()
                .eq("reqForQuoteNum", reqForQuoteNum)
                ?: throw NotFoundResponse("request for quote not found for this quotation")
        ctx.json(rfq)
    }
}
object Document {
    fun get(ctx :Context){
        val id  = ctx.pathParam("id")
        val doc = database.find(Document::class.java, id) ?: throw NotFoundResponse("no doc found with id $id")
        ctx.json(doc)
    }
    fun create(ctx :Context){
        val doc  = ctx.bodyAsClass<Document>()
        database.save(doc)
        ctx.result("doc created")
    }
    fun print(ctx :Context){
        //would be handled in the frontend ??
    }
    fun delete(ctx :Context){
        val id = ctx.pathParam("id")
        val doc  = database.find(Document::class.java, id) ?: throw NotFoundResponse("no doc found with id $id")
        //doc.delete()
        ctx.result("document deleted")
    }
    fun getWithRefId(ctx :Context){
        //fetches a particular doc (po, quote) with ref id
        val refId = ctx.pathParam("refId")
        val doc = database.find(Document::class.java)
            .where()
            .eq("refId", refId)
            ?: throw NotFoundResponse("no doc found for refId $refId")
        ctx.json(doc)
    }

}
object Vendor {
    fun get(ctx :Context){
        val id  = ctx.pathParam("id")
        val vendor = database.find(Vendor::class.java, id) ?: throw NotFoundResponse("no vendor found with id $id")
        ctx.json(vendor)
    }
    fun create(ctx :Context){
        val vendor = ctx.bodyAsClass<Vendor>()
        database.save(vendor)
        ctx.result("vendor created")
    }
    fun update(ctx :Context){

    }
    fun delete(ctx :Context){

    }
    fun getQuotes(ctx :Context){
        val id = ctx.pathParam("id")
        val quotes = database.find(Quotation::class.java)
            .where()
            .eq("vendor", id)
            .findList()
        ctx.json(quotes)
    }
    fun getPos(ctx :Context){
        val id = ctx.pathParam("id")
        val pos = database.find(PurchaseOrder::class.java)
            .where()
            .eq("vendor", id)
            .findList()
        ctx.json(pos)
    }
    fun rate(ctx :Context){
        val id = ctx.pathParam("id")
        val rating  = ctx.pathParam("rating").toDouble()
        val vendor  = database.find(Vendor::class.java, id) ?: throw NotFoundResponse("vendor not found for id $id")
        //could place some rating validation checks
        vendor.rating = rating
        vendor.save()
        ctx.result("rating changed")
    }
}
object RequestForQuote {
    fun create(ctx :Context) {
        val rfq = ctx.bodyAsClass<ReqForQuote>()
        database.save(rfq)
        //ctx.result("request for quote created")
        //ctx.json(rfq)
        //ctx.status(HttpStatus.CREATED)
        //ctx.json("asss")
    }
    fun get(ctx :Context){
        val id = ctx.pathParam("id")
        val rfq = database.find(ReqForQuote::class.java, id) ?: throw NotFoundResponse("request for quote not found for id $id")
        ctx.json(rfq)
    }
    fun update(ctx :Context){
        //shuld we compare the new body fields with preexisting ones and prepare a sql query to update those fields??

    }
}