"""
ESCTR — Research Interface

Dark-themed Gradio UI with IBM Plex Mono typography.
Tabs: Blog · Playground · Leaderboard
"""

import gradio as gr
import random
from .environment import ESCTREnvironment
from .models import ESCTRAction
from .ui_styles import (
    INJECT_CSS, HEADER_HTML, ARCH_SVG, EPISODE_SVG,
    BLOG_HTML, LEADERBOARD_HTML,
)


# ── State management ─────────────────────────────────────────────────────────

def create_env():
    return ESCTREnvironment()


def reset_episode(task_name, seed_text):
    """Reset the environment with a task and seed."""
    env = create_env()
    seed = int(seed_text) if seed_text.strip() else random.randint(0, 99999)
    obs = env.reset(task_name=task_name, seed=seed)

    log = f"{'='*60}\n"
    log += f"  ESCTR — New Episode\n"
    log += f"  Task: {task_name} | Seed: {seed}\n"
    log += f"{'='*60}\n\n"
    log += f"BRIEFING:\n{obs.system_response}\n\n"
    log += f"{'─'*60}\n"

    status = f"Step 0 | Reward: 0.00 | Investigating..."

    return (
        env, log, "0.00", status, str(seed), 0,
        gr.update(interactive=True),
        gr.update(interactive=True),
        gr.update(interactive=True),
        gr.update(interactive=True),
    )


def execute_tool(env, log, step_count, action_type, **kwargs):
    """Execute a tool action and update the log."""
    if env is None:
        return env, log + "\n>> Reset the environment first.\n", "0.00", "Not started", step_count

    try:
        action = ESCTRAction(action_type=action_type, **kwargs)
        obs = env.step(action)
    except Exception as e:
        log += f"\nERROR: {str(e)}\n"
        return env, log, "0.00", "Error", step_count

    step_count += 1
    reward = obs.reward
    done = obs.done

    param_str = ", ".join(f'{k}="{v}"' for k, v in kwargs.items() if v)
    log += f"\n[Step {step_count}] {action_type}({param_str})\n"
    log += f"{'─'*40}\n"

    response = obs.system_response
    if len(response) > 1500:
        response = response[:1500] + "\n... [truncated]"
    log += f"{response}\n"
    log += f"{'─'*40}\n"

    if done:
        log += f"\n{'='*60}\n"
        log += f"  EPISODE COMPLETE\n"
        log += f"  Final Reward: {reward:.4f}\n"
        log += f"  Steps Used: {step_count}\n"
        log += f"{'='*60}\n"
        status = f"Done in {step_count} steps | Final Reward: {reward:.4f}"
    else:
        status = f"Step {step_count} | Reward: {reward:.4f} | Investigating..."

    return env, log, f"{reward:.4f}", status, step_count


def query_db(env, log, step_count, table):
    if not table:
        log += "\n>> Select a table.\n"
        return env, log, "0.00", "Select a table", step_count
    return execute_tool(env, log, step_count, "query_database",
                        query_parameters={"table": table})


def read_doc(env, log, step_count, doc_id):
    if not doc_id.strip():
        log += "\n>> Enter a document ID.\n"
        return env, log, "0.00", "Enter ID", step_count
    return execute_tool(env, log, step_count, "read_document",
                        document_id=doc_id.strip())


def contact_vendor(env, log, step_count, message):
    if not message.strip():
        log += "\n>> Enter a message.\n"
        return env, log, "0.00", "Enter message", step_count
    return execute_tool(env, log, step_count, "communicate_vendor",
                        message_content=message.strip())


def submit_decision(env, log, step_count, amount, reason):
    try:
        amt = float(amount)
    except (ValueError, TypeError):
        log += "\n>> Enter a valid numeric amount.\n"
        return env, log, "0.00", "Invalid amount", step_count
    if not reason.strip():
        reason = "Financial adjustment based on investigation"
    return execute_tool(env, log, step_count, "submit_financial_decision",
                        adjustment_amount=amt, adjustment_reason=reason.strip())


# ── Build UI ─────────────────────────────────────────────────────────────────

def build_gradio_app():
    with gr.Blocks(title="ESCTR Environment") as demo:

        # Hidden state
        env_state = gr.State(None)
        step_counter = gr.State(0)

        # Inject dark theme CSS + header
        gr.HTML(INJECT_CSS)
        gr.HTML(HEADER_HTML)

        with gr.Tabs():

            # ── Tab 1: Blog ───────────────────────────────────
            with gr.Tab("Blog"):
                gr.HTML(BLOG_HTML)

            # ── Tab 2: Playground ─────────────────────────────
            with gr.Tab("Playground"):
                gr.HTML(EPISODE_SVG)
                gr.HTML('<p style="text-align:center;font-family:IBM Plex Mono,monospace;font-size:0.85rem;color:#64748b;font-style:italic;margin:0 0 1rem">Select a task and seed below, then use the tools to investigate. Click submit when ready.</p>')

                # Row 1: Task + Seed + Start
                with gr.Row():
                    task_dropdown = gr.Dropdown(
                        choices=[
                            ("Procurement Reconciliation (Easy)",
                             "procurement_reconciliation"),
                            ("SLA Enforcement (Medium)",
                             "sla_enforcement"),
                            ("Adversarial Auditing (Hard)",
                             "adversarial_auditing"),
                        ],
                        value="procurement_reconciliation",
                        label="Task",
                        scale=2,
                    )
                    seed_input = gr.Textbox(
                        label="Seed",
                        placeholder="random",
                        value="",
                        scale=1,
                    )
                    reset_btn = gr.Button(
                        "▶ Start Episode",
                        variant="primary",
                        scale=1,
                    )

                # Status bar
                with gr.Row():
                    status_bar = gr.Textbox(
                        label="Status",
                        value="Click '▶ Start Episode' to begin",
                        interactive=False,
                        scale=3,
                    )
                    reward_display = gr.Textbox(
                        label="Reward",
                        value="—",
                        interactive=False,
                        scale=1,
                    )
                    seed_display = gr.Textbox(
                        label="Active Seed",
                        value="—",
                        interactive=False,
                        scale=1,
                    )

                # Row 2: Tools (left) + Log (right)
                with gr.Row():
                    with gr.Column(scale=1, min_width=300):
                        gr.HTML('<p style="font-family:IBM Plex Mono,monospace;font-weight:600;font-size:0.9rem;color:#0f172a;margin:0.5rem 0">Tools</p>')

                        # Tool 1: query_database
                        db_table = gr.Dropdown(
                            choices=[
                                "purchase_orders", "invoices",
                                "shipping_logs", "sla_contracts",
                                "warehouse_logs",
                            ],
                            label="query_database → table",
                            value="purchase_orders",
                        )
                        query_btn = gr.Button("Run Query")

                        # Tool 2: read_document
                        doc_id_input = gr.Textbox(
                            label="read_document → ID",
                            placeholder="PO-2025-1234",
                        )
                        read_btn = gr.Button("Read Document")

                        # Tool 3: communicate_vendor
                        vendor_msg = gr.Textbox(
                            label="communicate_vendor → message",
                            placeholder="We reject your settlement...",
                            lines=2,
                        )
                        vendor_btn = gr.Button("Send Message")

                        # Tool 4: submit_financial_decision
                        gr.HTML('<hr style="border:none;border-top:1px solid #e2e8f0;margin:0.5rem 0">')
                        adj_amount = gr.Textbox(
                            label="submit_financial_decision → amount ($)",
                            placeholder="-450.00",
                        )
                        adj_reason = gr.Textbox(
                            label="Reason",
                            placeholder="Overcharge on line items",
                        )
                        submit_btn = gr.Button(
                            "⚡ Submit Decision", variant="stop",
                        )

                    with gr.Column(scale=2):
                        log_output = gr.Textbox(
                            label="Investigation Log",
                            value="Waiting for episode...",
                            lines=28,
                            max_lines=50,
                            interactive=False,
                        )

            # ── Tab 3: Leaderboard ────────────────────────────
            with gr.Tab("Leaderboard"):
                gr.HTML(LEADERBOARD_HTML)

        # ── Event Handlers ────────────────────────────────────

        reset_outputs = [
            env_state, log_output, reward_display, status_bar,
            seed_display, step_counter,
            query_btn, read_btn, vendor_btn, submit_btn,
        ]
        reset_btn.click(
            fn=reset_episode,
            inputs=[task_dropdown, seed_input],
            outputs=reset_outputs,
        )

        tool_outputs = [
            env_state, log_output, reward_display,
            status_bar, step_counter,
        ]

        query_btn.click(
            fn=query_db,
            inputs=[env_state, log_output, step_counter, db_table],
            outputs=tool_outputs,
        )
        read_btn.click(
            fn=read_doc,
            inputs=[env_state, log_output, step_counter, doc_id_input],
            outputs=tool_outputs,
        )
        vendor_btn.click(
            fn=contact_vendor,
            inputs=[env_state, log_output, step_counter, vendor_msg],
            outputs=tool_outputs,
        )
        submit_btn.click(
            fn=submit_decision,
            inputs=[
                env_state, log_output, step_counter,
                adj_amount, adj_reason,
            ],
            outputs=tool_outputs,
        )

    return demo