from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
import os
import json
import shutil
import tempfile

from app_kit.config import load_app_config
from app_kit.demo_packs import load_demo_pack
from app_kit.logging_utils import setup_logging
from app_kit.model_registry import load_model_registry
from app_kit.project import ProjectSpec
from app_kit.storage import SQLiteStore
from app_kit.tracing import utc_now, write_trace_artifact


THEME_CSS_PATH = Path(__file__).resolve().parents[2] / "assets" / "theme.css"


@dataclass(frozen=True)
class AppRuntime:
    spec: ProjectSpec
    config: object
    store: SQLiteStore
    registry: dict


def run_pack_with_trace(spec: ProjectSpec, store: SQLiteStore, config: object, path: str):
    demo_pack = load_demo_pack(path)
    started_at = utc_now()
    output = spec.run_pack(demo_pack, store, config)
    finished_at = utc_now()
    trace_payload = {
        'kind': 'app-load',
        'project': spec.key,
        'pack_id': demo_pack.pack_id,
        'pack_path': str(path),
        'started_at': started_at,
        'finished_at': finished_at,
        'result': output,
    }
    if isinstance(output, dict):
        for key in ('model_name', 'model_id', 'adapter_name', 'generation_stats'):
            if key in output and output[key] not in (None, '', [], {}, ()):
                trace_payload[key] = output[key]
    trace_path = write_trace_artifact(
        config.artifact_dir,
        trace_payload,
    )
    return output, f'✅ Loaded **{demo_pack.pack_id}** successfully! Trace artifact written.', trace_path


def _format_pipeline_result(output: dict | list | None) -> str:
    """Format pipeline result as readable Markdown instead of raw JSON."""
    if not output:
        return ""
    if isinstance(output, list):
        output = output[0] if output else {}

    lines = []

    # Triage badge
    triage = output.get('triage', '')
    triage_icons = {'urgent': '🔴 URGENT', 'important': '🟡 IMPORTANT', 'FYI': '🟢 FYI'}
    triage_display = triage_icons.get(triage, triage.upper())
    lines.append(f"### {triage_display}")
    lines.append("")

    # Summary
    summary = output.get('summary', '')
    if summary:
        lines.append(f"**Summary:** {summary}")
        lines.append("")

    # Q&A Section
    qa = output.get('qa', [])
    if qa:
        lines.append("---")
        lines.append("### 📋 Document Analysis")
        for item in qa:
            q = item.get('question', '')
            a = item.get('answer', 'not stated')
            icon = '✅' if a != 'not stated' else '❔'
            lines.append(f"- {icon} **{q}**")
            lines.append(f"  > {a}")
        lines.append("")

    # File info
    file_type = output.get('file_type', '')
    source_file = output.get('source_file', '')
    title = output.get('title', '')
    if title or file_type:
        lines.append("---")
        lines.append(f"📄 **Document:** {title} ({file_type})")

    # Inbox items
    inbox_items = output.get('inbox_items', [])
    if inbox_items and len(inbox_items) > 1:
        lines.append("")
        lines.append("### 📥 Processed Documents")
        for item in inbox_items:
            t = item.get('triage', '')
            badge = triage_icons.get(t, t)
            lines.append(f"- {badge} **{item.get('title', 'Untitled')}** — {item.get('summary', '')[:120]}")

    return "\n".join(lines)


def _format_search_results(results: list | None) -> str:
    """Format search results as readable Markdown."""
    if not results:
        return "*No results found. Try a different search query.*"

    lines = ["### 🔍 Search Results", ""]
    for i, result in enumerate(results, 1):
        title = result.get('title', 'Untitled')
        text = result.get('primary_text', '')[:200]
        status = result.get('status', '')
        lines.append(f"**{i}. {title}** `{status}`")
        lines.append(f"> {text}")
        lines.append("")

    return "\n".join(lines)


def _format_history(records: list | None) -> str:
    """Format history/inbox as readable Markdown."""
    if not records:
        return "*No records yet. Upload a document to get started.*"

    lines = ["### 📥 Document History", ""]
    triage_icons = {'urgent': '🔴', 'important': '🟡', 'FYI': '🟢'}
    for record in records:
        title = record.get('title', 'Untitled')
        created = record.get('created_at', '')[:19]
        try:
            blob = json.loads(record.get('json_blob', '{}')) if isinstance(record.get('json_blob'), str) else record.get('json_blob', {})
        except Exception:
            blob = {}
        triage = blob.get('triage', '')
        icon = triage_icons.get(triage, '📄')
        summary = blob.get('summary', record.get('primary_text', ''))[:150]
        lines.append(f"{icon} **{title}** — `{created}`")
        lines.append(f"> {summary}")
        lines.append("")

    return "\n".join(lines)


def _process_uploaded_files(files, spec, store, config):
    """Process uploaded files through the pipeline."""
    from app_kit.demo_packs import DemoPack
    if not files:
        return "⚠️ No files uploaded.", "Please upload one or more documents."

    # Copy uploaded files to a temp directory that looks like a demo pack
    temp_dir = Path(tempfile.mkdtemp(prefix="upload_"))
    file_paths = []
    for f in files:
        src = Path(f)
        dst = temp_dir / src.name
        shutil.copy2(src, dst)
        file_paths.append(dst)
        
    manifest_path = temp_dir / "manifest.json"
    if not any(f.name in ("manifest.json", "manifest.yaml", "manifest.yml") for f in file_paths):
        import json
        manifest_data = {
            "project": spec.key,
            "pack_id": f"upload_{temp_dir.name.split('_')[-1]}",
            "inputs": [{"path": p.name, "kind": "document"} for p in file_paths]
        }
        manifest_path.write_text(json.dumps(manifest_data), encoding='utf-8')

    try:
        # Build a minimal DemoPack-like structure
        demo_pack = load_demo_pack(str(temp_dir))
        started_at = utc_now()
        output = spec.run_pack(demo_pack, store, config)
        finished_at = utc_now()
        trace_payload = {
            'kind': 'app-upload',
            'project': spec.key,
            'pack_id': demo_pack.pack_id,
            'file_count': len(file_paths),
            'started_at': started_at,
            'finished_at': finished_at,
            'result': output,
        }
        if isinstance(output, dict):
            for key in ('model_name', 'model_id', 'adapter_name', 'generation_stats'):
                if key in output and output[key] not in (None, '', [], {}, ()):
                    trace_payload[key] = output[key]
        write_trace_artifact(
            config.artifact_dir,
            trace_payload,
        )
        formatted = _format_pipeline_result(output)
        status = f"✅ Processed {len(file_paths)} document(s) successfully."
        return formatted, status
    except Exception as e:
        return f"❌ **Error processing documents:** {e}", f"Error: {e}"


def run_app(spec: ProjectSpec) -> int:
    import gradio as gr

    config = load_app_config(spec.key)
    logger = setup_logging(spec.key)
    registry = load_model_registry(config.model_registry_path)
    logger.info('%s app listening', spec.key.upper())
    store = SQLiteStore(config.sqlite_path, config.artifact_dir)

    # Friendly titles
    display_titles = {
        'p1': ('Elder Care Document Assistant', 'Upload documents to get instant triage, summaries, and action items for elderly care paperwork.'),
        'p4': ('Household Food Waste Tracker', 'Upload receipts and fridge notes to generate waste analysis reports.'),
    }
    display_title = display_titles.get(spec.key, (spec.title, spec.description))

    with gr.Blocks(title=display_title[0], css_paths=THEME_CSS_PATH) as demo:
        # Header
        gr.Markdown(f"""# {display_title[0]}

{display_title[1]}""")

        with gr.Tabs():
            with gr.Tab("📁 App Workspace"):
                with gr.Row():
                    with gr.Column(scale=2):
                        # File upload area
                        file_upload = gr.File(
                            label="📂 Upload Documents",
                            file_count="multiple",
                            file_types=[".pdf", ".png", ".jpg", ".jpeg", ".txt", ".md", ".json", ".csv"],
                            type="filepath",
                            elem_classes=["upload-area"],
                        )
                        status_display = gr.Markdown(
                            value="*Upload documents above to get started.*",
                            elem_classes=["status-box"],
                        )
                        upload_btn = gr.Button("📤 Process Documents", variant="primary", size="lg")

                    with gr.Column(scale=3):
                        # Pipeline result display
                        result_display = gr.Markdown(
                            value="### 👋 Welcome\nUpload a PDF, image, or text document to see the AI-powered triage and analysis.",
                            elem_classes=["result-card"],
                        )

                gr.Markdown("---")

                with gr.Row():
                    with gr.Column(scale=1):
                        search_query = gr.Textbox(
                            label="🔍 Search Documents",
                            placeholder="Type a keyword to search your document history...",
                            elem_classes=["search-box"],
                        )
                        search_btn = gr.Button("Search", variant="secondary")
                    with gr.Column(scale=2):
                        search_result_display = gr.Markdown(
                            value="*Enter a search query to find documents.*",
                            elem_classes=["result-card"],
                        )

                gr.Markdown("---")

                # History section
                gr.Markdown("### 📋 Document History")
                history_display = gr.Markdown(
                    value="*No documents processed yet.*",
                    elem_classes=["history-card"],
                )
                refresh_btn = gr.Button("🔄 Refresh History", variant="secondary")

            with gr.Tab("📖 How It Works"):
                if spec.key == 'p1':
                    gr.Markdown(
                        """
                        ### How to use the Elder Care Document Assistant
                        
                        1. **Upload Documents:** Drag and drop or click the **Upload Documents** area to upload paperwork, medical receipts, invoices, or letters related to elder care (supports PDF, images, text).
                        2. **Process:** Click the **Process Documents** button. The local AI agent will parse the text, assign a triage level (e.g., `🔴 URGENT`, `🟡 IMPORTANT`, `🟢 FYI`), extract a concise summary, and answer relevant clinical or administrative questions.
                        3. **View Results:** The AI output will be displayed immediately as a formatted card.
                        4. **Search and Reference:** Use the **Search Documents** feature to search past logs by query keyword. Click **Refresh History** to fetch the full database history of processed files.
                        
                        *All data is stored and processed locally on your offline device for compliance and privacy.*
                        """
                    )
                else: # p4
                    gr.Markdown(
                        """
                        ### How to use the Household Food Waste Tracker
                        
                        1. **Upload Grocery Data:** Drag and drop or browse shopping receipts, food inventory CSVs, or daily logs of discarded food.
                        2. **Analyze Waste:** Click the **Process Documents** button to analyze purchases, flag high-risk perishables, estimate shelf-lives, and generate a household food conservation summary.
                        3. **View Diagnostics:** Review the formatted report detailing waste trends, warnings, and sustainability tips.
                        4. **Search & History:** Retrieve previous inventory reviews using the **Search** box, and click **Refresh History** to list your cumulative food waste entries.
                        
                        *Processes data locally to ensure household privacy and secure offline storage.*
                        """
                    )

        # Event handlers
        def handle_upload(files):
            if not files:
                return "### 👋 Welcome\nUpload a PDF, image, or text document to see the AI-powered triage and analysis.", "*Please upload at least one file.*"
            formatted, status = _process_uploaded_files(files, spec, store, config)
            return formatted, status

        def refresh_history(_=None):
            records = store.history(spec.key)
            return _format_history(records)

        def search_history(query: str):
            if not spec.search_enabled:
                return "*Search is not enabled for this project.*"
            if not query.strip():
                return "*Enter a search query to find documents.*"
            results = store.search_records(spec.key, query)
            return _format_search_results(results)

        upload_btn.click(
            handle_upload,
            inputs=[file_upload],
            outputs=[result_display, status_display],
        )
        refresh_btn.click(refresh_history, inputs=[], outputs=[history_display])
        search_btn.click(search_history, inputs=[search_query], outputs=[search_result_display])

    server_name = os.environ.get('GRADIO_SERVER_NAME', '0.0.0.0')
    server_port = int(os.environ.get('PORT', '7860'))
    demo.launch(
        server_name=server_name,
        show_error=True,
        share=False,
    )
    return 0