import { useState } from 'react'
import { Table, Group, Text, TextInput } from '@mantine/core'
import { IconPlus, IconPlayerPlay, IconTrash } from '@tabler/icons-react'
import { Card, CardHeader, CardTitle, CardContent, SimpleSelect, Button, FnActionIcon } from '@fn_library'
import * as WailsApp from '../wailsjs/go/main/App'
import type { Entity, Assertion, AssertionResult, AssertionInput } from '../types'

interface Props {
  entities: Entity[]
}

export function AssertionPanel({ entities }: Props) {
  const [assertions, setAssertions] = useState<Assertion[]>([])
  const [results, setResults] = useState<AssertionResult[]>([])
  const [selectedEntity, setSelectedEntity] = useState(entities[0]?.id ?? '')
  const [showAdd, setShowAdd] = useState(false)
  const [newName, setNewName] = useState('')
  const [newKind, setNewKind] = useState('range')
  const [newRule, setNewRule] = useState('')
  const [newSeverity, setNewSeverity] = useState('warning')

  const loadAssertions = async (entityId: string) => {
    setSelectedEntity(entityId)
    const list = await WailsApp.ListAssertions(entityId) as unknown as Assertion[]
    setAssertions(list || [])
    setResults([])
  }

  const handleAdd = async () => {
    if (!newName || !newRule) return
    const input: AssertionInput = {
      entity_id: selectedEntity,
      name: newName,
      kind: newKind,
      rule: newRule,
      severity: newSeverity,
      description: '',
    }
    await WailsApp.AddAssertion(input as never)
    setShowAdd(false)
    setNewName('')
    setNewRule('')
    loadAssertions(selectedEntity)
  }

  const handleEval = async () => {
    const res = await WailsApp.EvalAssertions(selectedEntity) as unknown as AssertionResult[]
    setResults(res || [])
  }

  const handleDelete = async (id: string) => {
    await WailsApp.DeleteAssertion(id)
    loadAssertions(selectedEntity)
  }

  return (
    <Card variant="default" style={{ marginTop: 12 }}>
      <CardHeader>
        <Group justify="space-between" align="center" py="xs">
          <CardTitle>Assertions</CardTitle>
          <Group gap="sm">
            <SimpleSelect
              value={selectedEntity}
              onValueChange={loadAssertions}
              placeholder="Select entity..."
              options={entities.map(e => ({ value: e.id, label: e.name }))}
            />
            <Button size="sm" onClick={handleEval} disabled={!selectedEntity}>
              <IconPlayerPlay size={14} style={{ marginRight: 4 }} /> Eval
            </Button>
            <Button size="sm" variant="outline" onClick={() => setShowAdd(!showAdd)} disabled={!selectedEntity}>
              <IconPlus size={14} />
            </Button>
          </Group>
        </Group>
      </CardHeader>

      {showAdd && (
        <Group px="md" pb="sm" gap="sm" align="flex-end">
          <TextInput
            label="Name"
            value={newName}
            onChange={e => setNewName(e.currentTarget.value)}
            size="xs"
            flex={1}
          />
          <div style={{ width: 96 }}>
            <Text size="xs" fw={500} mb={4}>Kind</Text>
            <SimpleSelect
              value={newKind}
              onValueChange={setNewKind}
              options={[
                { value: 'range', label: 'range' },
                { value: 'null', label: 'null' },
                { value: 'statistical', label: 'statistical' },
                { value: 'consistency', label: 'consistency' },
                { value: 'freshness', label: 'freshness' },
              ]}
            />
          </div>
          <div style={{ width: 96 }}>
            <Text size="xs" fw={500} mb={4}>Severity</Text>
            <SimpleSelect
              value={newSeverity}
              onValueChange={setNewSeverity}
              options={[
                { value: 'critical', label: 'critical' },
                { value: 'warning', label: 'warning' },
                { value: 'info', label: 'info' },
              ]}
            />
          </div>
          <TextInput
            label="Rule (SQL expr)"
            value={newRule}
            onChange={e => setNewRule(e.currentTarget.value)}
            placeholder="risk_score > 70"
            size="xs"
            flex={1}
          />
          <Button size="sm" onClick={handleAdd}>Add</Button>
        </Group>
      )}

      <CardContent style={{ padding: 0 }}>
        <Table highlightOnHover>
          <Table.Thead>
            <Table.Tr>
              <Table.Th>Name</Table.Th>
              <Table.Th>Kind</Table.Th>
              <Table.Th>Rule</Table.Th>
              <Table.Th>Severity</Table.Th>
              <Table.Th>Result</Table.Th>
              <Table.Th ta="right">Actions</Table.Th>
            </Table.Tr>
          </Table.Thead>
          <Table.Tbody>
            {assertions.map(a => {
              const result = results.find(r => r.assertion_id === a.id)
              return (
                <Table.Tr key={a.id}>
                  <Table.Td>{a.name}</Table.Td>
                  <Table.Td>
                    <Text size="sm" c="dimmed">{a.kind}</Text>
                  </Table.Td>
                  <Table.Td>
                    <Text size="xs" ff="monospace">{a.rule}</Text>
                  </Table.Td>
                  <Table.Td>
                    <Text size="sm" c={a.severity === 'critical' ? 'red' : a.severity === 'warning' ? 'yellow' : 'dimmed'}>
                      {a.severity}
                    </Text>
                  </Table.Td>
                  <Table.Td>
                    {result ? (
                      <Text size="sm" c={result.status === 'pass' ? 'teal' : 'red'}>
                        {result.status}
                      </Text>
                    ) : '—'}
                  </Table.Td>
                  <Table.Td ta="right">
                    <FnActionIcon
                      icon={<IconTrash size={14} />}
                      variant="subtle"
                      size="sm"
                      color="red"
                      onClick={() => handleDelete(a.id)}
                    />
                  </Table.Td>
                </Table.Tr>
              )
            })}
            {assertions.length === 0 && (
              <Table.Tr>
                <Table.Td colSpan={6}>
                  <Text ta="center" c="dimmed" py="xl">
                    {selectedEntity ? 'No assertions for this entity' : 'Select an entity to view assertions'}
                  </Text>
                </Table.Td>
              </Table.Tr>
            )}
          </Table.Tbody>
        </Table>
      </CardContent>
    </Card>
  )
}