"""
DAM Client - OpenText DAM API Integration
Handles OAuth2 authentication and all DAM operations
Compatible with Python 3.6+
"""

import requests
import time
import logging
import os

logger = logging.getLogger('DAMClient')

class DAMClient:
    def __init__(self, config):
        self.base_url = config['dam']['base_url'].rstrip('/')
        self.auth_url = config['dam']['auth_url']
        self.client_id = config['dam']['client_id']
        self.client_secret = config['dam']['client_secret']
        self.timeout = config['dam']['timeout_seconds']

        self.access_token = None
        self.token_expiry = 0

    def get_access_token(self):
        """Get OAuth2 access token with auto-refresh"""
        if self.access_token and time.time() < self.token_expiry:
            return self.access_token

        return self._request_new_token()

    def _request_new_token(self):
        """Request new OAuth2 token"""
        try:
            response = requests.post(
                self.auth_url,
                data={
                    'grant_type': 'client_credentials',
                    'client_id': self.client_id,
                    'client_secret': self.client_secret
                },
                timeout=30
            )

            if response.status_code == 200:
                data = response.json()
                self.access_token = data['access_token']
                # Set expiry with 60 second buffer
                expires_in = data.get('expires_in', 3600)
                self.token_expiry = time.time() + expires_in - 60

                logger.info("OAuth token obtained, expires in {}s".format(expires_in))
                return self.access_token
            else:
                raise Exception("OAuth failed: HTTP {} - {}".format(
                    response.status_code, response.text
                ))

        except Exception as e:
            logger.error("Failed to get OAuth token: {}".format(str(e)))
            raise

    def search_campaigns(self, status=None):
        """
        Search for campaigns with optional status filter

        Args:
            status: Content Scaling Status (A1, A2, A3, etc.) or None for all

        Returns:
            List of campaign dictionaries
        """
        try:
            token = self.get_access_token()

            # Search for Local Adaptation campaigns
            search_payload = {
                "text_search_resource": {
                    "boolean_clause_list": [
                        {
                            "field_name": "NAME",
                            "field_value": "Local",
                            "operator": "CONTAINS"
                        }
                    ]
                }
            }

            response = requests.post(
                "{}/v6/search/text".format(self.base_url),
                json=search_payload,
                headers={
                    'Authorization': 'Bearer {}'.format(token),
                    'Content-Type': 'application/json'
                },
                timeout=self.timeout
            )

            if response.status_code != 200:
                raise Exception("Search failed: HTTP {}".format(response.status_code))

            data = response.json()
            all_campaigns = []

            if 'search_result_resource' in data:
                results = data['search_result_resource']['search_result'].get('search_result_element_list', [])

                for result in results:
                    asset = result.get('resource', {})

                    # Extract campaign info
                    campaign = self._extract_campaign_info(asset)

                    # Filter by status if provided
                    if status is None or campaign.get('status') == status:
                        all_campaigns.append(campaign)

            logger.info("Found {} campaigns{}".format(
                len(all_campaigns),
                " with status {}".format(status) if status else ""
            ))

            return all_campaigns

        except Exception as e:
            logger.error("Failed to search campaigns: {}".format(str(e)))
            raise

    def _extract_campaign_info(self, asset):
        """Extract campaign information from asset data"""
        campaign = {
            'asset_id': asset.get('asset_id'),
            'campaign_name': None,
            'campaign_id': None,
            'status': None,
            'brand': None,
            'market': None
        }

        # Extract metadata fields
        if 'metadata' in asset and 'metadata_element_list' in asset['metadata']:
            for category in asset['metadata']['metadata_element_list']:
                if 'metadata_element_list' in category:
                    for field in category['metadata_element_list']:
                        field_id = field.get('id')
                        value = self._extract_field_value(field)

                        if field_id == 'ARTESIA.FIELD.NAME' or field_id == 'INER_NAME_GENERIC':
                            campaign['campaign_name'] = value
                        elif field_id == 'FERRERO.FIELD.CAMPAIGN_ID':
                            campaign['campaign_id'] = value
                        elif field_id == 'CONTENT.SCALING.STATUS':
                            campaign['status'] = value
                        elif field_id == 'FERRERO.FIELD.CAMPAIGN_BRAND':
                            campaign['brand'] = value
                        elif field_id == 'FERRERO.FIELD.CAMPAIGN_MARKET':
                            campaign['market'] = value

        return campaign

    def _extract_field_value(self, field):
        """Extract value from field structure"""
        if 'value' in field:
            val = field['value']
            if isinstance(val, dict):
                if 'value' in val and isinstance(val['value'], dict):
                    if 'value' in val['value']:
                        return val['value']['value']
                    elif 'field_value' in val['value'] and 'value' in val['value']['field_value']:
                        return val['value']['field_value']['value']
        return None

    def get_master_assets(self, campaign_id):
        """
        Get master assets from Master Assets folder

        Args:
            campaign_id: Campaign folder asset ID

        Returns:
            List of asset dictionaries with full metadata
        """
        try:
            # Find Master Assets folder
            master_folder_id = self._find_master_assets_folder(campaign_id)

            if not master_folder_id:
                raise Exception("Master Assets folder not found")

            # Get assets from folder
            token = self.get_access_token()

            response = requests.get(
                "{}/v6/folders/{}/children?load_type=full".format(
                    self.base_url, master_folder_id
                ),
                headers={'Authorization': 'Bearer {}'.format(token)},
                timeout=self.timeout
            )

            if response.status_code != 200:
                raise Exception("Failed to get assets: HTTP {}".format(response.status_code))

            data = response.json()
            assets = data.get('folder_children', {}).get('asset_list', [])

            logger.info("Found {} master assets in campaign {}".format(len(assets), campaign_id))

            return assets

        except Exception as e:
            logger.error("Failed to get master assets: {}".format(str(e)))
            raise

    def _find_master_assets_folder(self, campaign_id):
        """Find '01. Master Assets' folder in campaign"""
        try:
            token = self.get_access_token()

            response = requests.get(
                "{}/v6/folders/{}/children".format(self.base_url, campaign_id),
                headers={'Authorization': 'Bearer {}'.format(token)},
                timeout=self.timeout
            )

            if response.status_code != 200:
                return None

            data = response.json()
            folders = data.get('folder_children', {}).get('asset_list', [])

            for folder in folders:
                name = folder.get('name', '')
                if 'Master' in name and 'Assets' in name:
                    return folder['asset_id']

            return None

        except Exception as e:
            logger.error("Error finding Master Assets folder: {}".format(str(e)))
            return None

    def find_final_assets_folder(self, campaign_id):
        """Find '01. Final Assets' folder in campaign"""
        try:
            token = self.get_access_token()

            response = requests.get(
                "{}/v6/folders/{}/children".format(self.base_url, campaign_id),
                headers={'Authorization': 'Bearer {}'.format(token)},
                timeout=self.timeout
            )

            if response.status_code != 200:
                return None

            data = response.json()
            folders = data.get('folder_children', {}).get('asset_list', [])

            for folder in folders:
                name = folder.get('name', '')
                if 'Final' in name and 'Assets' in name:
                    return folder['asset_id']

            return None

        except Exception as e:
            logger.error("Error finding Final Assets folder: {}".format(str(e)))
            return None

    def download_asset(self, asset_id, output_dir='.'):
        """
        Download asset content

        Args:
            asset_id: Asset ID to download
            output_dir: Directory to save file

        Returns:
            Path to downloaded file
        """
        try:
            # Get asset metadata first to get filename
            token = self.get_access_token()

            metadata_response = requests.get(
                "{}/v6/assets/{}".format(self.base_url, asset_id),
                headers={'Authorization': 'Bearer {}'.format(token)},
                timeout=self.timeout
            )

            if metadata_response.status_code != 200:
                raise Exception("Failed to get asset metadata: HTTP {}".format(
                    metadata_response.status_code
                ))

            asset_data = metadata_response.json()
            asset = asset_data.get('asset_resource', {}).get('asset', asset_data)
            filename = asset.get('name', 'download_{}'.format(asset_id))

            # Download content
            content_response = requests.get(
                "{}/v6/assets/{}/contents".format(self.base_url, asset_id),
                headers={'Authorization': 'Bearer {}'.format(token)},
                timeout=self.timeout,
                stream=True
            )

            if content_response.status_code != 200:
                raise Exception("Download failed: HTTP {}".format(content_response.status_code))

            # Ensure output directory exists
            os.makedirs(output_dir, exist_ok=True)

            # Save file
            filepath = os.path.join(output_dir, filename)

            with open(filepath, 'wb') as f:
                for chunk in content_response.iter_content(chunk_size=8192):
                    f.write(chunk)

            file_size = os.path.getsize(filepath)
            logger.info("Downloaded: {} ({} bytes)".format(filename, file_size))

            return filepath

        except Exception as e:
            logger.error("Failed to download asset {}: {}".format(asset_id, str(e)))
            raise

    def upload_asset(self, file_path, folder_id, asset_representation, video_metadata=None):
        """
        Upload asset to DAM

        Args:
            file_path: Path to file to upload
            folder_id: Parent folder ID
            asset_representation: Asset metadata JSON structure
            video_metadata: Optional video metadata (width, height, etc.)

        Returns:
            dict with success, asset_id, http_code
        """
        try:
            token = self.get_access_token()
            filename = os.path.basename(file_path)
            mime_type = self._get_mime_type(file_path)

            # Build upload manifest
            file_info = {
                'file_name': filename,
                'file_type': mime_type
            }

            # Add video dimensions if available
            if video_metadata:
                if video_metadata.get('width', 0) > 0:
                    file_info['width'] = video_metadata['width']
                if video_metadata.get('height', 0) > 0:
                    file_info['height'] = video_metadata['height']

            upload_manifest = {
                'upload_manifest': {
                    'master_files': [
                        {'file': file_info}
                    ]
                }
            }

            # Prepare multipart upload
            import json
            files = {
                'files': (filename, open(file_path, 'rb'), mime_type)
            }

            data = {
                'asset_representation': json.dumps(asset_representation),
                'parent_folder_id': folder_id,
                'manifest': json.dumps(upload_manifest)
            }

            response = requests.post(
                "{}/v6/assets".format(self.base_url),
                data=data,
                files=files,
                headers={'Authorization': 'Bearer {}'.format(token)},
                timeout=self.timeout
            )

            # Close file
            files['files'][1].close()

            http_code = response.status_code

            if http_code in [201, 202]:
                result_data = response.json()
                asset_id = None

                if 'asset_resource_list' in result_data:
                    asset_id = result_data['asset_resource_list']['asset_resource'][0]['asset']['asset_id']
                elif 'job_handle' in result_data:
                    asset_id = result_data['job_handle'].get('job_id')

                logger.info("Upload successful: {} → Asset ID: {}".format(filename, asset_id))

                return {
                    'success': True,
                    'asset_id': asset_id,
                    'http_code': http_code
                }
            else:
                error_msg = "Upload failed: HTTP {}".format(http_code)
                if response.text:
                    try:
                        error_data = response.json()
                        if 'exception_body' in error_data:
                            error_msg = error_data['exception_body'].get('message', error_msg)
                    except:
                        pass

                logger.error(error_msg)
                return {
                    'success': False,
                    'error': error_msg,
                    'http_code': http_code
                }

        except Exception as e:
            logger.error("Upload exception: {}".format(str(e)))
            return {
                'success': False,
                'error': str(e),
                'http_code': 0
            }

    def update_campaign_status(self, campaign_id, new_status):
        """
        Update Content Scaling Status field

        Args:
            campaign_id: Campaign folder ID
            new_status: New status value (A2, A3, etc.)

        Returns:
            dict with success boolean
        """
        try:
            token = self.get_access_token()

            payload = {
                "edited_folder": {
                    "data": {
                        "metadata": [
                            {
                                "id": "CONTENT.SCALING.STATUS",
                                "value": {
                                    "domain_value": True,
                                    "value": {
                                        "value": new_status
                                    }
                                }
                            }
                        ]
                    }
                }
            }

            response = requests.patch(
                "{}/v6/folders/{}?lock_strategy=optimistic".format(
                    self.base_url, campaign_id
                ),
                json=payload,
                headers={
                    'Authorization': 'Bearer {}'.format(token),
                    'Content-Type': 'application/json'
                },
                timeout=self.timeout
            )

            if response.status_code == 200:
                logger.info("Updated campaign {} status to {}".format(campaign_id, new_status))
                return {'success': True}
            else:
                error_msg = "Status update failed: HTTP {}".format(response.status_code)
                logger.error(error_msg)
                return {'success': False, 'error': error_msg}

        except Exception as e:
            logger.error("Status update exception: {}".format(str(e)))
            return {'success': False, 'error': str(e)}

    def test_connection(self):
        """Test DAM connection by getting a token"""
        try:
            token = self.get_access_token()
            return token is not None
        except:
            return False

    def _get_mime_type(self, file_path):
        """Get MIME type for file"""
        import mimetypes
        mime_type, _ = mimetypes.guess_type(file_path)
        return mime_type or 'application/octet-stream'