package com.android.trisolarisserver.controller

import com.android.trisolarisserver.controller.dto.PropertyUserResponse
import com.android.trisolarisserver.controller.dto.UserResponse
import com.android.trisolarisserver.repo.AppUserRepo
import com.android.trisolarisserver.repo.PropertyUserRepo
import com.android.trisolarisserver.security.MyPrincipal
import com.google.firebase.auth.FirebaseAuth
import jakarta.servlet.http.HttpServletRequest
import org.slf4j.LoggerFactory
import org.springframework.security.core.annotation.AuthenticationPrincipal
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.PutMapping
import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.RequestBody
import org.springframework.web.bind.annotation.RestController
import org.springframework.web.server.ResponseStatusException
import org.springframework.http.HttpStatus
import org.springframework.http.ResponseEntity
import java.util.UUID

@RestController
@RequestMapping("/auth")
class Auth(
    private val appUserRepo: AppUserRepo,
    private val propertyUserRepo: PropertyUserRepo
) {
    private val logger = LoggerFactory.getLogger(Auth::class.java)

    @PostMapping("/verify")
    fun verify(
        @AuthenticationPrincipal principal: MyPrincipal?,
        request: HttpServletRequest
    ): ResponseEntity<AuthResponse> {
        logger.info("Auth verify hit, principalPresent={}", principal != null)
        val resolved = principal?.let { ResolveResult(it) } ?: resolvePrincipalFromHeader(request)
        return resolved.toResponseEntity()
    }

    @GetMapping("/me")
    fun me(
        @AuthenticationPrincipal principal: MyPrincipal?,
        request: HttpServletRequest
    ): ResponseEntity<AuthResponse> {
        val resolved = principal?.let { ResolveResult(it) } ?: resolvePrincipalFromHeader(request)
        return resolved.toResponseEntity()
    }

    @PutMapping("/me")
    fun updateMe(
        @AuthenticationPrincipal principal: MyPrincipal?,
        request: HttpServletRequest,
        @RequestBody body: UpdateMeRequest
    ): ResponseEntity<AuthResponse> {
        val resolved = principal?.let { ResolveResult(it) } ?: resolvePrincipalFromHeader(request)
        if (resolved.principal == null) {
            return ResponseEntity.status(HttpStatus.UNAUTHORIZED)
                .body(AuthResponse(status = "UNAUTHORIZED"))
        }
        val user = appUserRepo.findById(resolved.principal.userId).orElseThrow {
            ResponseStatusException(HttpStatus.UNAUTHORIZED, "User not found")
        }
        if (!body.name.isNullOrBlank()) {
            user.name = body.name.trim()
        }
        appUserRepo.save(user)
        return ResponseEntity.ok(buildAuthResponse(resolved.principal))
    }

    private fun buildAuthResponse(principal: MyPrincipal): AuthResponse {
        val user = appUserRepo.findById(principal.userId).orElseThrow {
            ResponseStatusException(HttpStatus.UNAUTHORIZED, "User not found")
        }
        val memberships = propertyUserRepo.findByIdUserId(principal.userId).map {
            PropertyUserResponse(
                userId = it.id.userId!!,
                propertyId = it.id.propertyId!!,
                roles = it.roles.map { role -> role.name }.toSet()
            )
        }
        val status = when {
            user.superAdmin -> "SUPER_ADMIN"
            memberships.isEmpty() -> "NO_PROPERTIES"
            else -> "OK"
        }
        return AuthResponse(
            status = status,
            user = UserResponse(
                id = user.id!!,
                firebaseUid = user.firebaseUid,
                phoneE164 = user.phoneE164,
                name = user.name,
                disabled = user.disabled,
                superAdmin = user.superAdmin
            ),
            properties = memberships
        )
    }

    private fun resolvePrincipalFromHeader(request: HttpServletRequest): ResolveResult {
        val header = request.getHeader("Authorization") ?: throw ResponseStatusException(
            HttpStatus.UNAUTHORIZED,
            "Missing Authorization token"
        )
        if (!header.startsWith("Bearer ")) {
            logger.warn("Auth verify invalid Authorization header")
            throw ResponseStatusException(HttpStatus.UNAUTHORIZED, "Invalid Authorization header")
        }
        val token = header.removePrefix("Bearer ").trim()
        val decoded = try {
            FirebaseAuth.getInstance().verifyIdToken(token)
        } catch (ex: Exception) {
            logger.warn("Auth verify failed: {}", ex.message)
            throw ResponseStatusException(HttpStatus.UNAUTHORIZED, "Invalid token")
        }
        val user = appUserRepo.findByFirebaseUid(decoded.uid) ?: run {
            val phone = decoded.claims["phone_number"] as? String
            val name = decoded.claims["name"] as? String
            val makeSuperAdmin = appUserRepo.count() == 0L
            val created = appUserRepo.save(
                com.android.trisolarisserver.models.property.AppUser(
                    firebaseUid = decoded.uid,
                    phoneE164 = phone,
                    name = name,
                    superAdmin = makeSuperAdmin
                )
            )
            logger.warn("Auth verify auto-created user uid={}, userId={}", decoded.uid, created.id)
            created
        }
        logger.warn("Auth verify resolved uid={}, userId={}", decoded.uid, user.id)
        return ResolveResult(
            MyPrincipal(
                userId = user.id ?: throw ResponseStatusException(HttpStatus.UNAUTHORIZED, "User id missing"),
                firebaseUid = decoded.uid
            )
        )
    }

    private fun ResolveResult.toResponseEntity(): ResponseEntity<AuthResponse> {
        return if (principal == null) {
            ResponseEntity.status(HttpStatus.UNAUTHORIZED)
                .body(AuthResponse(status = "UNAUTHORIZED"))
        } else {
            ResponseEntity.ok(buildAuthResponse(principal))
        }
    }
}

data class AuthResponse(
    val status: String,
    val user: UserResponse? = null,
    val properties: List<PropertyUserResponse> = emptyList()
)

data class UpdateMeRequest(
    val name: String? = null
)

private data class ResolveResult(
    val principal: MyPrincipal?
)