import { useState } from 'react'
import { AdminLayout } from '../Admin'
import { Button } from '../../../design-system/primitives/Button/Button'
import { Input } from '../../../design-system/primitives/Input/Input'
import { Toggle } from '../../../design-system/primitives/Toggle/Toggle'
import { FormField } from '../../../design-system/primitives/FormField/FormField'
import { Tag } from '../../../design-system/primitives/Tag/Tag'
import { SectionHeader } from '../../../design-system/primitives/SectionHeader/SectionHeader'
import { ConfirmDialog } from '../../../design-system/composites/ConfirmDialog/ConfirmDialog'
import { useToast } from '../../../design-system/composites/Toast/Toast'
import styles from './OidcConfig.module.css'

interface OidcFormData {
  enabled: boolean
  autoSignup: boolean
  issuerUri: string
  clientId: string
  clientSecret: string
  rolesClaim: string
  displayNameClaim: string
  defaultRoles: string[]
}

const INITIAL_DATA: OidcFormData = {
  enabled: true,
  autoSignup: true,
  issuerUri: 'https://keycloak.example.com/realms/cameleer',
  clientId: 'cameleer-app',
  clientSecret: '••••••••••••',
  rolesClaim: 'realm_access.roles',
  displayNameClaim: 'name',
  defaultRoles: ['USER', 'VIEWER'],
}

export function OidcConfig() {
  const [form, setForm] = useState<OidcFormData>(INITIAL_DATA)
  const [newRole, setNewRole] = useState('')
  const [deleteOpen, setDeleteOpen] = useState(false)
  const { toast } = useToast()

  function update<K extends keyof OidcFormData>(key: K, value: OidcFormData[K]) {
    setForm((prev) => ({ ...prev, [key]: value }))
  }

  function addRole() {
    const role = newRole.trim().toUpperCase()
    if (role && !form.defaultRoles.includes(role)) {
      update('defaultRoles', [...form.defaultRoles, role])
      setNewRole('')
    }
  }

  function removeRole(role: string) {
    update('defaultRoles', form.defaultRoles.filter((r) => r !== role))
  }

  function handleSave() {
    toast({ title: 'Settings saved', description: 'OIDC configuration updated successfully.', variant: 'success' })
  }

  function handleTest() {
    toast({ title: 'Connection test', description: 'OIDC provider responded successfully.', variant: 'info' })
  }

  function handleDelete() {
    setDeleteOpen(false)
    setForm({ ...INITIAL_DATA, enabled: false, issuerUri: '', clientId: '', clientSecret: '', defaultRoles: [] })
    toast({ title: 'Configuration deleted', description: 'OIDC configuration has been removed.', variant: 'warning' })
  }

  return (
    <AdminLayout title="OIDC Configuration">
      <div className={styles.page}>
        <div className={styles.header}>
          <h2 className={styles.title}>OIDC Configuration</h2>
          <div className={styles.headerActions}>
            <Button size="sm" variant="secondary" onClick={handleTest} disabled={!form.issuerUri}>
              Test Connection
            </Button>
            <Button size="sm" variant="primary" onClick={handleSave}>
              Save
            </Button>
          </div>
        </div>

        <section className={styles.section}>
          <SectionHeader>Behavior</SectionHeader>
          <div className={styles.toggleRow}>
            <Toggle
              label="Enabled"
              checked={form.enabled}
              onChange={(e) => update('enabled', e.target.checked)}
            />
          </div>
          <div className={styles.toggleRow}>
            <Toggle
              label="Auto Sign-Up"
              checked={form.autoSignup}
              onChange={(e) => update('autoSignup', e.target.checked)}
            />
            <span className={styles.hint}>Automatically create accounts for new OIDC users</span>
          </div>
        </section>

        <section className={styles.section}>
          <SectionHeader>Provider Settings</SectionHeader>
          <FormField label="Issuer URI" htmlFor="issuer">
            <Input
              id="issuer"
              type="url"
              placeholder="https://idp.example.com/realms/my-realm"
              value={form.issuerUri}
              onChange={(e) => update('issuerUri', e.target.value)}
            />
          </FormField>
          <FormField label="Client ID" htmlFor="client-id">
            <Input
              id="client-id"
              value={form.clientId}
              onChange={(e) => update('clientId', e.target.value)}
            />
          </FormField>
          <FormField label="Client Secret" htmlFor="client-secret">
            <Input
              id="client-secret"
              type="password"
              value={form.clientSecret}
              onChange={(e) => update('clientSecret', e.target.value)}
            />
          </FormField>
        </section>

        <section className={styles.section}>
          <SectionHeader>Claim Mapping</SectionHeader>
          <FormField label="Roles Claim" htmlFor="roles-claim" hint="JSON path to roles in the ID token">
            <Input
              id="roles-claim"
              value={form.rolesClaim}
              onChange={(e) => update('rolesClaim', e.target.value)}
            />
          </FormField>
          <FormField label="Display Name Claim" htmlFor="name-claim" hint="Claim used for user display name">
            <Input
              id="name-claim"
              value={form.displayNameClaim}
              onChange={(e) => update('displayNameClaim', e.target.value)}
            />
          </FormField>
        </section>

        <section className={styles.section}>
          <SectionHeader>Default Roles</SectionHeader>
          <div className={styles.tagList}>
            {form.defaultRoles.map((role) => (
              <Tag key={role} label={role} color="primary" onRemove={() => removeRole(role)} />
            ))}
            {form.defaultRoles.length === 0 && (
              <span className={styles.noRoles}>No default roles configured</span>
            )}
          </div>
          <div className={styles.addRoleRow}>
            <Input
              placeholder="Add role..."
              value={newRole}
              onChange={(e) => setNewRole(e.target.value)}
              onKeyDown={(e) => { if (e.key === 'Enter') { e.preventDefault(); addRole() } }}
              className={styles.roleInput}
            />
            <Button size="sm" variant="secondary" onClick={addRole} disabled={!newRole.trim()}>
              Add
            </Button>
          </div>
        </section>

        <section className={styles.section}>
          <SectionHeader>Danger Zone</SectionHeader>
          <Button size="sm" variant="danger" onClick={() => setDeleteOpen(true)}>
            Delete OIDC Configuration
          </Button>
          <ConfirmDialog
            open={deleteOpen}
            onClose={() => setDeleteOpen(false)}
            onConfirm={handleDelete}
            message="Delete OIDC configuration? All users signed in via OIDC will lose access."
            confirmText="delete oidc"
          />
        </section>
      </div>
    </AdminLayout>
  )
}
