/**
 * EntryForm — create/edit credential form.
 */

import { Component } from './component.js'
import { addEntry, updateEntry, getEntryById, getGroups } from '../lib/storage/db.js'
import { encrypt, decrypt } from '../lib/crypto/crypto.js'
import { createEntry, updateEntry as updateEntryModel, validateEntry, isTrashGroup } from '../lib/models/schema.js'
import { generatePassword } from '../lib/crypto/crypto.js'
import { app } from '../lib/stores/app.js'
import { search } from '../lib/stores/search.js'
import { autofocus } from '../lib/autofocus.js'

export class EntryForm extends Component {
  /** @param {{ entryId: string|null, onSave: Function, onCancel: Function }} props */
  constructor(container, props = {}) {
    super(container)
    this.entryId = props.entryId || null
    this.onSave = props.onSave || (() => {})
    this.onCancel = props.onCancel || (() => {})

    this.title = ''
    this.username = ''
    this.password = ''
    this.url = ''
    this.notes = ''
    this.groupId = ''
    this.passwordVisible = false
    this.groups = []
    this.loading = true
    this.error = ''
    this.saving = false
    this.isEdit = false
    this.formErrors = []
  }

  mount() {
    super.mount()
    this.#loadForm()
    return this
  }

  render() {
    this.el = this.ce('div', { className: 'entry-form' })
    this.#renderContent()
    return this.el
  }

  #renderContent() {
    this.el.innerHTML = ''

    if (this.loading) {
      this.el.appendChild(this.ce('div', { className: 'loading', textContent: 'Loading...' }))
      return
    }

    if (this.error && !this.isEdit) {
      this.el.appendChild(this.ce('div', { className: 'error-banner', textContent: this.error }))
      return
    }

    const form = this.ce('form', { className: 'ef-form-card', id: 'entry-form' })

    // Validation errors
    if (this.formErrors.length > 0) {
      const errDiv = this.ce('div', { className: 'validation-errors' })
      for (const err of this.formErrors) {
        errDiv.appendChild(this.ce('div', { className: 'validation-error', textContent: `⚠ ${err}` }))
      }
      form.appendChild(errDiv)
    }

    // Title
    form.appendChild(this.ce('div', { className: 'form-group' },
      this.ce('label', { htmlFor: 'title', textContent: 'Title *' }),
      this.ce('input', { id: 'title', type: 'text', placeholder: 'e.g. GitHub, Gmail', value: this.title }),
    ))

    // Username
    form.appendChild(this.ce('div', { className: 'form-group' },
      this.ce('label', { htmlFor: 'username', textContent: 'Username / Email' }),
      this.ce('input', { id: 'username', type: 'text', placeholder: 'username or email', value: this.username }),
    ))

    // Password
    const pwdGroup = this.ce('div', { className: 'form-group' },
      this.ce('label', { htmlFor: 'password', textContent: 'Password *' }),
      this.ce('div', { className: 'password-input-group' },
        this.ce('input', {
          id: 'password',
          type: this.passwordVisible ? 'text' : 'password',
          placeholder: 'Password',
          value: this.password,
        }),
        this.ce('button', { type: 'button', className: 'btn btn-ghost btn-sm', id: 'toggle-pwd', textContent: this.passwordVisible ? '🙈' : '👁', title: 'Toggle visibility' }),
        this.ce('button', { type: 'button', className: 'btn btn-ghost btn-sm', id: 'generate-pwd', textContent: '🎲', title: 'Generate password' }),
      ),
    )
    form.appendChild(pwdGroup)

    // URL
    form.appendChild(this.ce('div', { className: 'form-group' },
      this.ce('label', { htmlFor: 'url', textContent: 'URL' }),
      this.ce('input', { id: 'url', type: 'url', placeholder: 'https://example.com', value: this.url }),
    ))

    // Group
    const select = this.ce('select', { id: 'group' })
    const defaultOpt = this.ce('option', { value: '' }, this.text('No group'))
    select.appendChild(defaultOpt)
    for (const group of this.groups) {
      if (isTrashGroup(group.id)) continue
      const opt = this.ce('option', { value: group.id }, this.text(group.name))
      if (group.id === this.groupId) opt.selected = true
      select.appendChild(opt)
    }
    form.appendChild(this.ce('div', { className: 'form-group' },
      this.ce('label', { htmlFor: 'group', textContent: 'Group' }),
      select,
    ))

    // Notes
    form.appendChild(this.ce('div', { className: 'form-group' },
      this.ce('label', { htmlFor: 'notes', textContent: 'Notes' }),
      this.ce('textarea', { id: 'notes', placeholder: 'Any additional notes...' }),
    ))

    // Actions
    form.appendChild(this.ce('div', { className: 'ef-form-actions' },
      this.ce('button', {
        type: 'submit',
        className: 'btn btn-primary',
        disabled: this.saving,
        textContent: this.saving ? 'Saving...' : (this.isEdit ? '💾 Update' : '➕ Create'),
      }),
      this.ce('button', { type: 'button', className: 'btn btn-ghost', id: 'cancel-btn', textContent: 'Cancel' }),
    ))

    this.el.appendChild(form)

    // Wire up form events
    const formEl = this.q('#entry-form')
    if (formEl) this.on(formEl, 'submit', this.#handleSubmit)

    const cancelBtn = this.q('#cancel-btn')
    if (cancelBtn) this.on(cancelBtn, 'click', () => this.onCancel())

    const togglePwd = this.q('#toggle-pwd')
    if (togglePwd) {
      this.on(togglePwd, 'click', () => {
        this.passwordVisible = !this.passwordVisible
        const pwdInput = this.q('#password')
        if (pwdInput) pwdInput.type = this.passwordVisible ? 'text' : 'password'
        togglePwd.textContent = this.passwordVisible ? '🙈' : '👁'
      })
    }

    const generatePwd = this.q('#generate-pwd')
    if (generatePwd) {
      this.on(generatePwd, 'click', () => {
        this.password = generatePassword({ length: 16 })
        const pwdInput = this.q('#password')
        if (pwdInput) pwdInput.value = this.password
      })
    }

    // Wire input changes
    const titleInput = this.q('#title')
    if (titleInput) this.on(titleInput, 'input', (e) => { this.title = e.target.value })
    const usernameInput = this.q('#username')
    if (usernameInput) this.on(usernameInput, 'input', (e) => { this.username = e.target.value })
    const pwdInput = this.q('#password')
    if (pwdInput) this.on(pwdInput, 'input', (e) => { this.password = e.target.value })
    const urlInput = this.q('#url')
    if (urlInput) this.on(urlInput, 'input', (e) => { this.url = e.target.value })
    const notesInput = this.q('#notes')
    if (notesInput) this.on(notesInput, 'input', (e) => { this.notes = e.target.value })
    const groupSelect = this.q('#group')
    if (groupSelect) this.on(groupSelect, 'change', (e) => { this.groupId = e.target.value })

    // Autofocus title on new entries
    if (!this.isEdit && titleInput) autofocus(titleInput, true)
  }

  async #loadForm() {
    this.loading = true
    try {
      this.groups = await getGroups()
      if (this.entryId) {
        this.isEdit = true
        const entry = await getEntryById(this.entryId)
        if (entry) {
          this.title = entry.title
          this.username = entry.username
          this.password = await decrypt(entry.encryptedPassword, app.encryptionKey)
          this.url = entry.url || ''
          this.notes = entry.notes || ''
          this.groupId = entry.groupId || ''
        } else {
          this.error = 'Entry not found'
        }
      } else {
        const active = search.activeGroupId
        this.groupId = (active !== 'all' && active !== 'trash') ? active : ''
      }
    } catch (e) {
      this.error = 'Failed to load form: ' + e.message
    }
    this.loading = false
    this.#renderContent()
  }

  #handleSubmit = async (e) => {
    e.preventDefault()
    this.formErrors = []
    this.error = ''
    this.saving = true

    // Read current values from inputs
    const titleInput = this.q('#title')
    if (titleInput) this.title = titleInput.value
    const usernameInput = this.q('#username')
    if (usernameInput) this.username = usernameInput.value
    const pwdInput = this.q('#password')
    if (pwdInput) this.password = pwdInput.value
    const urlInput = this.q('#url')
    if (urlInput) this.url = urlInput.value
    const notesInput = this.q('#notes')
    if (notesInput) this.notes = notesInput.value
    const groupSelect = this.q('#group')
    if (groupSelect) this.groupId = groupSelect.value

    try {
      const validation = validateEntry({ title: this.title, username: this.username, encryptedPassword: this.password })
      if (!validation.valid) {
        this.formErrors = validation.errors
        this.saving = false
        this.#renderContent()
        return
      }

      const encryptedPassword = await encrypt(this.password, app.encryptionKey)

      if (this.isEdit) {
        const existing = await getEntryById(this.entryId)
        const updated = updateEntryModel(existing, {
          title: this.title,
          username: this.username,
          encryptedPassword,
          url: this.url,
          notes: this.notes,
          groupId: this.groupId,
        })
        await updateEntry(updated)
      } else {
        const entry = createEntry({
          title: this.title,
          username: this.username,
          encryptedPassword,
          url: this.url,
          notes: this.notes,
          groupId: this.groupId,
        })
        await addEntry(entry)
      }

      this.onSave()
    } catch (e) {
      this.error = 'Failed to save: ' + e.message
    }

    this.saving = false
    this.#renderContent()
  }
}