"""
ui_components.py — Elder-friendly Gradio UI layout for PharmaGuide.

Design principles (from CLAUDE.md):
  - Large fonts (minimum 18px body, 28px headings)
  - High contrast (dark text on light background)
  - Simple language in all labels and placeholders
  - One clear action per tab
  - Warm, friendly tone
  - Prominent disclaimer

This module exports:
  CUSTOM_CSS   : CSS string injected into the Gradio Blocks theme
  build_ui()   : Builds and returns the gr.Blocks app object

app.py calls build_ui() and attaches the inference callbacks to the
returned component references.
"""

import gradio as gr

# ── Custom CSS ───────────────────────────────────────────────────────────────

CUSTOM_CSS = """
/* ── Base font size — elder-friendly ── */
.gradio-container {
    font-size: 18px !important;
    font-family: 'Segoe UI', Arial, sans-serif !important;
    max-width: 860px !important;
    margin: 0 auto !important;
}

/* ── Headings ── */
h1 { font-size: 32px !important; color: #1a3a5c !important; }
h2 { font-size: 24px !important; color: #1a3a5c !important; }
h3 { font-size: 20px !important; color: #2c5282 !important; }

/* ── Primary button — large and clear ── */
.primary-btn button {
    font-size: 20px !important;
    padding: 14px 28px !important;
    border-radius: 8px !important;
    font-weight: 600 !important;
}

/* ── Input fields — larger text ── */
textarea, input[type="text"] {
    font-size: 18px !important;
    line-height: 1.5 !important;
}

/* ── Output markdown — readable line height ── */
.output-markdown {
    font-size: 18px !important;
    line-height: 1.7 !important;
}

/* ── Age slider label ── */
.age-slider label {
    font-size: 18px !important;
    font-weight: 600 !important;
}

/* ── Status / loading messages ── */
.status-box {
    font-size: 16px !important;
    color: #4a5568 !important;
    font-style: italic;
}

/* ── Disclaimer box ── */
.disclaimer {
    background: #fff3cd !important;
    border-left: 5px solid #f6ad55 !important;
    padding: 12px 16px !important;
    border-radius: 6px !important;
    font-size: 16px !important;
}

/* ── Tab labels ── */
.tab-nav button {
    font-size: 17px !important;
    padding: 10px 20px !important;
}

/* ── Hide Gradio footer ── */
footer { display: none !important; }
"""


# ── Header markdown ──────────────────────────────────────────────────────────

_HEADER_MD = """
# 💊 PharmaGuide
### Your Personal Medication Helper

**I can explain your medicines in plain, simple language.**
Enter your medications below or take a photo of a pill bottle — I'll do the rest.
"""

_DISCLAIMER_MD = """
<div class="disclaimer">
⚠️ <strong>Important:</strong> PharmaGuide provides general information only.
Always talk to your <strong>doctor or pharmacist</strong> before making any changes to your medications.
In an emergency, call <strong>911</strong>.
</div>
"""

_LIFESTYLE_EMOJI = {
    "alcohol":    "🍷",
    "grapefruit": "🍊",
    "food":       "🍽️",
    "dairy":      "🥛",
    "sun":        "🌞",
    "driving":    "🚗",
    "exercise":   "🏃",
}

_LIFESTYLE_LABEL = {
    "alcohol":    "Alcohol",
    "grapefruit": "Grapefruit juice",
    "food":       "Food timing",
    "dairy":      "Dairy / antacids",
    "sun":        "Sunlight",
    "driving":    "Driving / machinery",
    "exercise":   "Exercise / heat",
}


# ── Lifestyle card formatter ─────────────────────────────────────────────────

def format_lifestyle_card(lifestyle_data: dict) -> str:
    """
    Convert the dict returned by get_lifestyle_warnings() into a
    Markdown-formatted card for display in the UI output box.

    Args:
        lifestyle_data: {drug_name: {category: [sentence, ...]}}

    Returns:
        Markdown string, or "" if no lifestyle warnings found.
    """
    if not lifestyle_data:
        return ""

    lines = ["---", "### ⚠️ Things to be careful about while taking your medicines", ""]

    for drug_name, categories in lifestyle_data.items():
        if not categories:
            continue
        lines.append(f"**{drug_name}**")
        for category, sentences in categories.items():
            emoji = _LIFESTYLE_EMOJI.get(category, "•")
            label = _LIFESTYLE_LABEL.get(category, category.title())
            lines.append(f"{emoji} **{label}**")
            for sentence in sentences[:2]:
                lines.append(f"   {sentence.strip()}")
        lines.append("")

    lines.append(
        "_These are general guidelines. "
        "Your pharmacist can give you advice specific to your situation._"
    )
    return "\n".join(lines)


# ── UI builder ───────────────────────────────────────────────────────────────

def build_ui(callbacks=None):
    """
    Build the Gradio Blocks app and return it along with the key component
    references that app.py needs to attach callbacks to.

    Args:
        callbacks: dict with keys on_text_submit, on_photo_submit, on_voice_submit.
                   Wired inside the Blocks context (required for Gradio 6+).

    Returns:
        demo        : gr.Blocks instance
        components  : dict of component references
    """
    with gr.Blocks(title="PharmaGuide — Your Medication Helper") as demo:

        gr.Markdown(_HEADER_MD)

        with gr.Tabs():

            # ── Tab 1: Type medications ──────────────────────────────────
            with gr.Tab("📝  Type Your Medications"):
                gr.Markdown(
                    "**List your medications below.** Separate them with commas. "
                    "You can include 1 to 10 medicines."
                )

                drug_input = gr.Textbox(
                    label="Your medications",
                    placeholder="Example:  metformin, lisinopril, aspirin, atorvastatin",
                    lines=3,
                    max_lines=5,
                )

                age_input = gr.Slider(
                    label="Your age",
                    minimum=50,
                    maximum=100,
                    value=70,
                    step=1,
                    elem_classes=["age-slider"],
                )

                submit_btn = gr.Button(
                    "🔍  Check My Medications",
                    variant="primary",
                    elem_classes=["primary-btn"],
                )

            # ── Tab 2: Photo of pill bottle ──────────────────────────────
            with gr.Tab("📸  Take a Photo of Your Pill Bottle"):
                gr.Markdown(
                    "**Take a clear photo of your pill bottle label** and upload it here. "
                    "I'll read the medicine name and look it up for you."
                )

                image_input = gr.Image(
                    label="Photo of your pill bottle",
                    type="pil",
                    sources=["upload", "webcam"],
                )

                age_input_photo = gr.Slider(
                    label="Your age",
                    minimum=50,
                    maximum=100,
                    value=70,
                    step=1,
                    elem_classes=["age-slider"],
                )

                photo_btn = gr.Button(
                    "📷  Look Up This Medicine",
                    variant="primary",
                    elem_classes=["primary-btn"],
                )

            # ── Tab 3: Speak your medications ────────────────────────────
            with gr.Tab("🎤  Speak Your Medications"):
                gr.Markdown(
                    "**Press the microphone button and say your medication names.**\n\n"
                    "For example, you can say:\n"
                    "*\"I take metformin, lisinopril, and aspirin\"*\n\n"
                    "You can also describe a concern, like:\n"
                    "*\"I just started warfarin — what should I watch out for?\"*"
                )

                audio_input = gr.Audio(
                    label="Press the microphone to start recording",
                    sources=["microphone"],
                    type="filepath",
                )

                age_input_voice = gr.Slider(
                    label="Your age",
                    minimum=50,
                    maximum=100,
                    value=70,
                    step=1,
                    elem_classes=["age-slider"],
                )

                voice_btn = gr.Button(
                    "🎤  Check What I Said",
                    variant="primary",
                    elem_classes=["primary-btn"],
                )

                # Show the transcription so the user can confirm what was heard
                transcript_box = gr.Markdown(
                    value="",
                    label="What I heard",
                    elem_classes=["status-box"],
                )

        # ── Status / loading indicator ───────────────────────────────────
        status_box = gr.Markdown(
            value="",
            elem_classes=["status-box"],
        )

        # ── Main response area ───────────────────────────────────────────
        output_box = gr.Markdown(
            value="",
            label="What PharmaGuide Found",
            elem_classes=["output-markdown"],
        )

        # ── Disclaimer ───────────────────────────────────────────────────
        gr.HTML(_DISCLAIMER_MD)

        # ── Example queries (makes judging easier) ───────────────────────
        gr.Examples(
            examples=[
                ["metformin, lisinopril, aspirin", 70],
                ["atorvastatin, omeprazole, warfarin, metoprolol", 75],
                ["furosemide, potassium chloride, digoxin", 80],
            ],
            inputs=[drug_input, age_input],
            label="Quick examples — click to try",
        )

        # ── Wire callbacks inside context (required for Gradio 6+) ──────
        if callbacks:
            submit_btn.click(
                fn      = callbacks["on_text_submit"],
                inputs  = [drug_input, age_input],
                outputs = [status_box, output_box],
            )
            photo_btn.click(
                fn      = callbacks["on_photo_submit"],
                inputs  = [image_input, age_input_photo],
                outputs = [status_box, output_box],
            )
            voice_btn.click(
                fn      = callbacks["on_voice_submit"],
                inputs  = [audio_input, age_input_voice],
                outputs = [status_box, transcript_box, output_box],
            )

    return demo, {
        "drug_input":        drug_input,
        "age_input":         age_input,
        "age_input_photo":   age_input_photo,
        "submit_btn":        submit_btn,
        "image_input":       image_input,
        "photo_btn":         photo_btn,
        "audio_input":       audio_input,
        "age_input_voice":   age_input_voice,
        "voice_btn":         voice_btn,
        "transcript_box":    transcript_box,
        "output_box":        output_box,
        "status_box":        status_box,
    }