package soy.iko.opencode.ui.server

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.imePadding
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.foundation.verticalScroll
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.ArrowBack
import androidx.compose.material3.Button
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedButton
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.text.input.KeyboardType
import androidx.compose.ui.text.input.PasswordVisualTransformation
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import androidx.lifecycle.viewmodel.compose.viewModel
import soy.iko.opencode.di.AppContainer
import soy.iko.opencode.R
import soy.iko.opencode.ui.vmFactory

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun ServerEditScreen(
    container: AppContainer,
    profileId: String?,
    onDone: () -> Unit,
) {
    val vm: ServerEditViewModel =
        viewModel(factory = vmFactory { ServerEditViewModel(container, profileId) })
    val state by vm.state.collectAsStateWithLifecycle()

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(if (state.isNew) stringResource(R.string.add_server) else stringResource(R.string.edit_server)) },
                navigationIcon = {
                    IconButton(onClick = onDone) {
                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = stringResource(R.string.back))
                    }
                },
            )
        },
    ) { padding ->
        if (!state.loaded) {
            val loadingLabel = stringResource(R.string.loading)
            Box(modifier = Modifier.fillMaxSize().padding(padding), contentAlignment = Alignment.Center) {
                CircularProgressIndicator(Modifier.semantics { contentDescription = loadingLabel })
            }
        } else {
        Column(
            modifier = Modifier
                .padding(padding)
                .imePadding()
                .widthIn(max = 600.dp)
                .padding(16.dp)
                .verticalScroll(rememberScrollState()),
            verticalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            OutlinedTextField(
                value = state.label,
                onValueChange = { v -> vm.update { it.copy(label = v) } },
                label = { Text(stringResource(R.string.label_optional)) },
                singleLine = true,
                keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
                modifier = Modifier.fillMaxWidth().testTag("server_label"),
            )
            OutlinedTextField(
                value = state.baseUrl,
                onValueChange = { v -> vm.update { it.copy(baseUrl = v, authFieldsVisible = false, error = null) } },
                label = { Text(stringResource(R.string.base_url)) },
                placeholder = { Text(stringResource(R.string.base_url_hint)) },
                singleLine = true,
                keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Uri, imeAction = ImeAction.Next),
                modifier = Modifier.fillMaxWidth().testTag("server_url"),
            )
            // Connectivity check — probes the server without credentials to detect
            // whether auth is required. Auth fields are only revealed afterwards (or
            // when editing a profile that already has saved credentials).
            OutlinedButton(
                onClick = { vm.probe() },
                enabled = state.canSave && !state.probing && !state.saving,
                modifier = Modifier.fillMaxWidth().testTag("server_probe"),
            ) {
                if (state.probing) {
                    CircularProgressIndicator(
                        modifier = Modifier.size(20.dp),
                        strokeWidth = 2.dp,
                    )
                    Text(stringResource(R.string.checking), modifier = Modifier.padding(start = 8.dp))
                } else {
                    Text(stringResource(R.string.check_connectivity))
                }
            }
            AnimatedVisibility(visible = state.authFieldsVisible) {
                Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
                    Text(
                        stringResource(R.string.auth_required),
                        style = MaterialTheme.typography.bodySmall,
                        color = MaterialTheme.colorScheme.error,
                    )
                    OutlinedTextField(
                        value = state.username,
                        onValueChange = { v -> vm.update { it.copy(username = v) } },
                        label = { Text(stringResource(R.string.username_optional)) },
                        singleLine = true,
                        keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
                        modifier = Modifier.fillMaxWidth().testTag("server_username"),
                    )
                    OutlinedTextField(
                        value = state.password,
                        onValueChange = { v -> vm.update { it.copy(password = v) } },
                        label = { Text(stringResource(R.string.password_optional)) },
                        singleLine = true,
                        visualTransformation = PasswordVisualTransformation(),
                        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Password, imeAction = ImeAction.Done),
                        keyboardActions = KeyboardActions(onDone = { if (state.canSave && !state.saving) vm.save(onDone) }),
                        modifier = Modifier.fillMaxWidth().testTag("server_password"),
                    )
                }
            }
            Button(
                onClick = { vm.save(onDone) },
                enabled = state.canSave && !state.saving,
                modifier = Modifier.fillMaxWidth(),
            ) {
                if (state.saving) {
                    CircularProgressIndicator(
                        modifier = Modifier.size(20.dp),
                        color = MaterialTheme.colorScheme.onPrimary,
                        strokeWidth = 2.dp,
                    )
                    Text(stringResource(R.string.saving), modifier = Modifier.padding(start = 8.dp))
                } else {
                    Text(stringResource(R.string.save))
                }
            }
            state.error?.let { message ->
                Text(
                    message,
                    color = androidx.compose.material3.MaterialTheme.colorScheme.error,
                    style = androidx.compose.material3.MaterialTheme.typography.bodySmall,
                    modifier = Modifier.fillMaxWidth(),
                )
            }
        }
        }
    }
}