package com.android.trisolarisserver.controller

import com.android.trisolarisserver.component.PropertyAccess
import com.android.trisolarisserver.component.RoomImageStorage
import com.android.trisolarisserver.controller.dto.RoomImageResponse
import com.android.trisolarisserver.models.room.RoomImage
import com.android.trisolarisserver.models.property.Role
import com.android.trisolarisserver.repo.RoomImageRepo
import com.android.trisolarisserver.repo.RoomRepo
import com.android.trisolarisserver.security.MyPrincipal
import org.springframework.core.io.FileSystemResource
import org.springframework.http.HttpHeaders
import org.springframework.http.HttpStatus
import org.springframework.http.MediaType
import org.springframework.http.ResponseEntity
import org.springframework.security.core.annotation.AuthenticationPrincipal
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.PathVariable
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.RequestParam
import org.springframework.web.bind.annotation.ResponseStatus
import org.springframework.web.bind.annotation.RestController
import org.springframework.web.multipart.MultipartFile
import org.springframework.web.server.ResponseStatusException
import java.nio.file.Files
import java.nio.file.Paths
import java.util.UUID

@RestController
@RequestMapping("/properties/{propertyId}/rooms/{roomId}/images")
class RoomImages(
    private val propertyAccess: PropertyAccess,
    private val roomRepo: RoomRepo,
    private val roomImageRepo: RoomImageRepo,
    private val storage: RoomImageStorage,
    @org.springframework.beans.factory.annotation.Value("\${storage.rooms.publicBaseUrl}")
    private val publicBaseUrl: String
) {

    @GetMapping
    fun list(
        @PathVariable propertyId: UUID,
        @PathVariable roomId: UUID,
        @AuthenticationPrincipal principal: MyPrincipal?
    ): List<RoomImageResponse> {
        requirePrincipal(principal)
        propertyAccess.requireMember(propertyId, principal!!.userId)
        ensureRoom(propertyId, roomId)
        return roomImageRepo.findByRoomIdOrdered(roomId)
            .map { it.toResponse(publicBaseUrl) }
    }

    @PostMapping
    @ResponseStatus(HttpStatus.CREATED)
    fun upload(
        @PathVariable propertyId: UUID,
        @PathVariable roomId: UUID,
        @AuthenticationPrincipal principal: MyPrincipal?,
        @RequestParam("file") file: MultipartFile,
        @RequestParam(required = false) tags: List<String>?
    ): RoomImageResponse {
        requirePrincipal(principal)
        propertyAccess.requireMember(propertyId, principal!!.userId)
        propertyAccess.requireAnyRole(propertyId, principal.userId, Role.ADMIN, Role.MANAGER)
        val room = ensureRoom(propertyId, roomId)

        if (file.isEmpty) {
            throw ResponseStatusException(HttpStatus.BAD_REQUEST, "File is empty")
        }
        val stored = try {
            storage.store(propertyId, roomId, file)
        } catch (ex: IllegalArgumentException) {
            throw ResponseStatusException(HttpStatus.BAD_REQUEST, ex.message ?: "Invalid image")
        }

        val nextRoomSortOrder = roomImageRepo.findMaxRoomSortOrder(roomId) + 1
        val nextRoomTypeSortOrder = roomImageRepo.findMaxRoomTypeSortOrder(room.roomType.code) + 1
        val image = RoomImage(
            property = room.property,
            room = room,
            originalPath = stored.originalPath,
            thumbnailPath = stored.thumbnailPath,
            contentType = stored.contentType,
            sizeBytes = stored.sizeBytes,
            roomTypeCode = room.roomType.code,
            tags = tags?.toMutableSet() ?: mutableSetOf(),
            roomSortOrder = nextRoomSortOrder,
            roomTypeSortOrder = nextRoomTypeSortOrder
        )
        return roomImageRepo.save(image).toResponse(publicBaseUrl)
    }

    @GetMapping("/{imageId}/file")
    fun file(
        @PathVariable propertyId: UUID,
        @PathVariable roomId: UUID,
        @PathVariable imageId: UUID,
        @RequestParam(required = false, defaultValue = "full") size: String,
        @AuthenticationPrincipal principal: MyPrincipal?
    ): ResponseEntity<FileSystemResource> {
        requirePrincipal(principal)
        propertyAccess.requireMember(propertyId, principal!!.userId)
        ensureRoom(propertyId, roomId)

        val image = roomImageRepo.findByIdAndRoomIdAndPropertyId(imageId, roomId, propertyId)
            ?: throw ResponseStatusException(HttpStatus.NOT_FOUND, "Image not found")
        val path = if (size.equals("thumb", true)) image.thumbnailPath else image.originalPath
        val file = Paths.get(path)
        if (!Files.exists(file)) {
            throw ResponseStatusException(HttpStatus.NOT_FOUND, "File missing")
        }
        val resource = FileSystemResource(file)
        val type = image.contentType
        return ResponseEntity.ok()
            .contentType(MediaType.parseMediaType(type))
            .header(HttpHeaders.CONTENT_DISPOSITION, "inline; filename=\"room-${imageId}.${file.fileName}\"")
            .contentLength(resource.contentLength())
            .body(resource)
    }

    private fun ensureRoom(propertyId: UUID, roomId: UUID): com.android.trisolarisserver.models.room.Room {
        return roomRepo.findByIdAndPropertyId(roomId, propertyId)
            ?: throw ResponseStatusException(HttpStatus.NOT_FOUND, "Room not found")
    }

    private fun requirePrincipal(principal: MyPrincipal?) {
        if (principal == null) {
            throw ResponseStatusException(HttpStatus.UNAUTHORIZED, "Missing principal")
        }
    }
}

private fun RoomImage.toResponse(baseUrl: String): RoomImageResponse {
    val id = id ?: throw ResponseStatusException(HttpStatus.INTERNAL_SERVER_ERROR, "Image id missing")
    return RoomImageResponse(
        id = id,
        propertyId = property.id!!,
        roomId = room.id!!,
        roomTypeCode = roomTypeCode,
        url = "$baseUrl/properties/${property.id}/rooms/${room.id}/images/$id/file",
        thumbnailUrl = "$baseUrl/properties/${property.id}/rooms/${room.id}/images/$id/file?size=thumb",
        contentType = contentType,
        sizeBytes = sizeBytes,
        tags = tags.toSet(),
        roomSortOrder = roomSortOrder,
        roomTypeSortOrder = roomTypeSortOrder,
        createdAt = createdAt.toString()
    )
}