package com.android.trisolarisserver.controller.property

import com.android.trisolarisserver.component.auth.PropertyAccess
import com.android.trisolarisserver.controller.common.requirePrincipal
import com.android.trisolarisserver.controller.dto.property.PropertyAccessCodeCreateRequest
import com.android.trisolarisserver.controller.dto.property.PropertyAccessCodeJoinRequest
import com.android.trisolarisserver.controller.dto.property.PropertyAccessCodeResponse
import com.android.trisolarisserver.controller.dto.property.PropertyUserResponse
import com.android.trisolarisserver.models.property.PropertyAccessCode
import com.android.trisolarisserver.models.property.Property
import com.android.trisolarisserver.models.property.PropertyUser
import com.android.trisolarisserver.models.property.PropertyUserId
import com.android.trisolarisserver.models.property.Role
import com.android.trisolarisserver.repo.property.AppUserRepo
import com.android.trisolarisserver.repo.property.PropertyAccessCodeRepo
import com.android.trisolarisserver.repo.property.PropertyRepo
import com.android.trisolarisserver.repo.property.PropertyUserRepo
import com.android.trisolarisserver.security.MyPrincipal
import org.springframework.http.HttpStatus
import org.springframework.security.core.annotation.AuthenticationPrincipal
import org.springframework.web.bind.annotation.PathVariable
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RequestBody
import org.springframework.web.bind.annotation.ResponseStatus
import org.springframework.web.bind.annotation.RestController
import org.springframework.web.server.ResponseStatusException
import org.springframework.transaction.annotation.Transactional
import java.security.SecureRandom
import java.time.OffsetDateTime
import java.util.UUID

@RestController
class PropertyAccessCodes(
    private val propertyAccess: PropertyAccess,
    private val propertyRepo: PropertyRepo,
    private val propertyUserRepo: PropertyUserRepo,
    private val accessCodeRepo: PropertyAccessCodeRepo,
    private val appUserRepo: AppUserRepo
) {

    private val secureRandom = SecureRandom()

    @PostMapping("/properties/{propertyId}/access-codes")
    @ResponseStatus(HttpStatus.CREATED)
    fun createAccessCode(
        @PathVariable propertyId: UUID,
        @AuthenticationPrincipal principal: MyPrincipal?,
        @RequestBody request: PropertyAccessCodeCreateRequest
    ): PropertyAccessCodeResponse {
        val resolved = requirePrincipal(principal)
        propertyAccess.requireMember(propertyId, resolved.userId)
        propertyAccess.requireAnyRole(propertyId, resolved.userId, Role.ADMIN)

        val roles = parseRoles(request.roles)
        if (roles.contains(Role.ADMIN)) {
            throw ResponseStatusException(HttpStatus.BAD_REQUEST, "ADMIN cannot be invited by code")
        }
        if (roles.isEmpty()) {
            throw ResponseStatusException(HttpStatus.BAD_REQUEST, "At least one role is required")
        }

        val property = propertyRepo.findById(propertyId).orElseThrow {
            ResponseStatusException(HttpStatus.NOT_FOUND, "Property not found")
        }
        val actor = appUserRepo.findById(resolved.userId).orElseThrow {
            ResponseStatusException(HttpStatus.UNAUTHORIZED, "User not found")
        }
        val now = OffsetDateTime.now()
        val expiresAt = now.plusMinutes(1)
        val code = generateCode(propertyId, now)

        val accessCode = PropertyAccessCode(
            property = property,
            createdBy = actor,
            code = code,
            expiresAt = expiresAt,
            roles = roles.toMutableSet()
        )
        accessCodeRepo.save(accessCode)

        return PropertyAccessCodeResponse(
            propertyId = propertyId,
            code = code,
            expiresAt = expiresAt,
            roles = roles.map { it.name }.toSet()
        )
    }

    @PostMapping("/properties/access-codes/join")
    @Transactional
    fun joinWithAccessCode(
        @AuthenticationPrincipal principal: MyPrincipal?,
        @RequestBody request: PropertyAccessCodeJoinRequest
    ): PropertyUserResponse {
        val resolved = requirePrincipal(principal)
        val code = request.code.trim()
        if (code.length != 6 || !code.all { it.isDigit() }) {
            throw ResponseStatusException(HttpStatus.NOT_FOUND, "Invalid code")
        }
        val now = OffsetDateTime.now()
        val property = resolveProperty(request)
        val accessCode = accessCodeRepo.findActiveByPropertyAndCode(property.id!!, code, now)
            ?: throw ResponseStatusException(HttpStatus.NOT_FOUND, "Invalid code")

        val membershipId = PropertyUserId(propertyId = property.id, userId = resolved.userId)
        if (propertyUserRepo.existsById(membershipId)) {
            throw ResponseStatusException(HttpStatus.CONFLICT, "User already a member")
        }

        val user = appUserRepo.findById(resolved.userId).orElseThrow {
            ResponseStatusException(HttpStatus.UNAUTHORIZED, "User not found")
        }

        val propertyUser = PropertyUser(
            id = membershipId,
            property = property,
            user = user,
            roles = accessCode.roles.toMutableSet()
        )
        propertyUserRepo.save(propertyUser)

        accessCode.usedAt = now
        accessCode.usedBy = user
        accessCodeRepo.save(accessCode)

        return PropertyUserResponse(
            userId = membershipId.userId!!,
            propertyId = membershipId.propertyId!!,
            roles = propertyUser.roles.map { it.name }.toSet()
        )
    }

    private fun resolveProperty(request: PropertyAccessCodeJoinRequest): Property {
        val code = request.propertyCode?.trim().orEmpty()
        if (code.isNotBlank()) {
            return propertyRepo.findByCode(code)
                ?: throw ResponseStatusException(HttpStatus.NOT_FOUND, "Property not found")
        }
        val rawId = request.propertyId?.trim().orEmpty()
        if (rawId.isBlank()) {
            throw ResponseStatusException(HttpStatus.BAD_REQUEST, "Property code required")
        }
        val asUuid = runCatching { UUID.fromString(rawId) }.getOrNull()
        return if (asUuid != null) {
            propertyRepo.findById(asUuid).orElseThrow {
                ResponseStatusException(HttpStatus.NOT_FOUND, "Property not found")
            }
        } else {
            propertyRepo.findByCode(rawId)
                ?: throw ResponseStatusException(HttpStatus.NOT_FOUND, "Property not found")
        }
    }

    private fun parseRoles(input: Set<String>): Set<Role> {
        return try {
            input.map { Role.valueOf(it) }.toSet()
        } catch (ex: IllegalArgumentException) {
            throw ResponseStatusException(HttpStatus.BAD_REQUEST, "Unknown role")
        }
    }

    private fun generateCode(propertyId: UUID, now: OffsetDateTime): String {
        repeat(6) {
            val value = secureRandom.nextInt(1_000_000)
            val code = String.format("%06d", value)
            if (!accessCodeRepo.existsActiveByPropertyAndCode(propertyId, code, now)) {
                return code
            }
        }
        throw ResponseStatusException(HttpStatus.CONFLICT, "Unable to generate code, try again")
    }
}