/**
 * Index File Generator
 *
 * Generates a consolidated index.ts that re-exports everything
 * from the generated files for clean imports.
 */

function pascalCase(str) {
  return str.charAt(0).toUpperCase() + str.slice(1)
}

function toPascalCase(str) {
  return str
    .split(/[.\-_]/)
    .map(part => part.charAt(0).toUpperCase() + part.slice(1))
    .join('')
}

/**
 * Generate the consolidated index.ts file.
 */
export function generateIndex({ channelsSchema, mizanSchema }) {
  const lines = [
    '/**',
    ' * mizan API - Consolidated Exports',
    ' *',
    ' * Import everything from here:',
    ' *',
    ' * @example',
    ' * ```tsx',
    ' * import {',
    ' *     MizanContext,',
    ' *     useCurrentUser,',
    ' *     useEcho,',
    ' *     useChatChannel,',
    ' * } from \'@/api\'',
    ' * ```',
    ' */',
    '',
    '// AUTO-GENERATED by mizan - do not edit manually',
    '// Regenerate with: npm run schemas',
    '',
  ]

  const functions = mizanSchema?.['x-mizan-functions'] || []
  const contextGroups = mizanSchema?.['x-mizan-contexts'] || {}
  const hasMizan = functions.length > 0

  if (hasMizan) {
    const globalContexts = functions.filter(fn => fn.isContext === 'global')
    const regularFunctions = functions.filter(fn => !fn.isContext && !fn.isForm)
    const namedContextEntries = Object.entries(contextGroups).filter(([name]) => name !== 'global')

    lines.push('// =============================================================================')
    lines.push('// mizan Provider & Hooks')
    lines.push('// =============================================================================')
    lines.push('')

    // Server exports
    if (globalContexts.length > 0) {
      lines.push('export {')
      lines.push('    getMizanHydration,')
      lines.push('    getDjangoHydration,')
      lines.push('    type MizanHydrationData,')
      lines.push('    type DjangoHydration,')
      lines.push("} from './generated.server'")
      lines.push('')
    }

    // Client exports
    lines.push('export {')
    lines.push('    // Provider')
    lines.push('    MizanContext,')
    lines.push('    type MizanContextProps,')
    lines.push('    DjangoContext,')
    lines.push('    type DjangoContextProps,')

    // Global context hooks
    if (globalContexts.length > 0) {
      lines.push('')
      lines.push('    // Global context hooks')
      for (const ctx of globalContexts) {
        const hookPascal = pascalCase(ctx.camelName)
        lines.push(`    use${hookPascal},`)
      }
      lines.push('')
      lines.push('    // Refresh hooks')
      lines.push('    useMizanRefresh,')
      lines.push('    useDjangoRefresh,')
    }

    // Named context providers and hooks
    if (namedContextEntries.length > 0) {
      lines.push('')
      lines.push('    // Named context providers')
      for (const [ctxName, ctxMeta] of namedContextEntries) {
        const ctxPascal = toPascalCase(ctxName)
        lines.push(`    ${ctxPascal}Context,`)
        // Hooks for this context's functions
        const ctxFunctions = functions.filter(fn => fn.isContext === ctxName)
        for (const fn of ctxFunctions) {
          const hookPascal = pascalCase(fn.camelName)
          lines.push(`    use${hookPascal},`)
        }
      }
    }

    // Function hooks (mutations + plain)
    if (regularFunctions.length > 0) {
      lines.push('')
      lines.push('    // Function hooks')
      for (const fn of regularFunctions) {
        const pascal = pascalCase(fn.camelName)
        lines.push(`    use${pascal},`)
      }
    }

    lines.push('')
    lines.push('    // Re-exports from mizan library')
    lines.push('    useMizan,')
    lines.push('    useMizanStatus,')
    lines.push('    usePush,')
    lines.push('    DjangoError,')
    lines.push('    type ConnectionStatus,')
    lines.push('    type PushMessage,')
    lines.push('    type PushListener,')
    lines.push("} from './generated.provider'")
    lines.push('')
  }

  // ==========================================================================
  // Channel Hooks
  // ==========================================================================

  const channels = channelsSchema?.['x-mizan-channels'] || []

  if (channels.length > 0) {
    lines.push('// =============================================================================')
    lines.push('// Channel Hooks')
    lines.push('// =============================================================================')
    lines.push('')
    lines.push('export {')
    for (const ch of channels) {
      lines.push(`    use${ch.pascalName}Channel,`)
    }
    lines.push("} from './generated.channels.hooks'")
    lines.push('')

    lines.push('// =============================================================================')
    lines.push('// Channel Types')
    lines.push('// =============================================================================')
    lines.push('')
    lines.push('export type {')
    for (const ch of channels) {
      if (ch.hasParams) lines.push(`    ${ch.paramsType},`)
      if (ch.hasReactMessage) lines.push(`    ${ch.reactMessageType},`)
      if (ch.hasDjangoMessage) lines.push(`    ${ch.djangoMessageType},`)
    }
    lines.push("} from './generated.channels'")
    lines.push('')
  }

  return lines.join('\n')
}