import json
from typing import Any, Callable
import gradio as gr

def create_custom_ui(env: Any, action_cls: Any, observation_cls: Any) -> gr.Blocks:
    # A dark, cyber-security focused theme mapping closely to Voyager's,
    # but tailored for PrivilegeDesk (blues, purples, neon green).
    theme = gr.themes.Soft(
        primary_hue="indigo",
        secondary_hue="blue",
        neutral_hue="slate",
    ).set(
        body_background_fill="*neutral_950",
        body_background_fill_dark="*neutral_950",
        block_background_fill="*neutral_900",
        block_background_fill_dark="*neutral_900",
        block_border_color="*neutral_800",
        block_border_color_dark="*neutral_800",
        block_label_background_fill="*neutral_800",
        button_primary_background_fill="*primary_600",
        button_primary_background_fill_dark="*primary_600",
        button_secondary_background_fill="*primary_800",
        button_secondary_background_fill_dark="*primary_800",
        border_color_primary="*neutral_800",
        background_fill_secondary="*neutral_900",
        color_accent="*primary_500",
    )

    custom_css = """
    /* VOYAGER Premium Styling Clones */
    .gradio-container {
        font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    }
    
    #header-container {
        text-align: center;
        margin-bottom: 2rem;
        padding-top: 2rem;
    }
    
    #header-title {
        font-size: 2.5rem;
        font-weight: 800;
        background: linear-gradient(90deg, #818cf8, #3b82f6);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        margin-bottom: 0.5rem;
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 12px;
    }
    
    #header-subtitle {
        color: #94a3b8;
        font-size: 1.1rem;
        font-weight: 400;
    }
    
    /* Stats Row styling */
    .stat-box {
        background: #1e293b;
        border-radius: 8px;
        padding: 1.25rem;
        text-align: center;
        border: 1px solid #334155;
        box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    }
    
    .stat-number {
        font-size: 1.8rem;
        font-weight: 700;
        color: #818cf8;
        margin-bottom: 0.25rem;
    }
    
    .stat-label {
        font-size: 0.75rem;
        font-weight: 600;
        color: #64748b;
        text-transform: uppercase;
        letter-spacing: 0.05em;
    }

    /* Episode Log Console */
    #episode-log {
        background-color: #0f172a;
        color: #a78bfa;
        font-family: 'JetBrains Mono', 'Fira Code', monospace;
        padding: 1rem;
        border: 1px solid #1e293b;
        border-radius: 8px;
        height: 250px;
        overflow-y: auto;
    }

    #episode-log.yellow-text { color: #facc15; }
    
    /* Tool blocks styling */
    .tool-group {
        background-color: #1e293b;
        border-radius: 6px;
        padding: 10px;
        margin-bottom: 10px;
        border-left: 3px solid #818cf8;
    }
    .tool-group h4 {
        color: #94a3b8;
        margin-top: 0;
        margin-bottom: 8px;
        font-size: 0.85rem;
        text-transform: uppercase;
    }
    .tool-tag {
        display: inline-block;
        background: #0f172a;
        color: #38bdf8;
        padding: 3px 8px;
        border-radius: 4px;
        font-size: 0.8rem;
        margin: 2px;
        font-family: 'JetBrains Mono', monospace;
    }
    """

    with gr.Blocks(theme=theme, css=custom_css, title="PrivilegeDesk - OpenEnv") as demo:
        
        # ─── HEADER ───────────────────────────────────────────────────────────
        with gr.Column(elem_id="header-container"):
            gr.HTML("""
                <div id="header-title">
                    <svg width="40" height="40" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-shield-check"><path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"/><path d="m9 12 2 2 4-4"/></svg>
                    PrivilegeDesk Environment
                </div>
                <div id="header-subtitle">Interactive Simulated IAM & Privilege Management Environment for RL Agents</div>
            """)
        
        # ─── STATS ROW ────────────────────────────────────────────────────────
        with gr.Row():
            def make_stat_box(val, label):
                return f"""<div class="stat-box"><div class="stat-number">{val}</div><div class="stat-label">{label}</div></div>"""
            
            gr.HTML(make_stat_box("19", "Tools"))
            gr.HTML(make_stat_box("6", "Categories"))
            gr.HTML(make_stat_box("18", "Reward Signals"))
            gr.HTML(make_stat_box("3", "Difficulty Levels"))
            gr.HTML(make_stat_box("3", "Tasks (Easy, Med, Hard)"))
            # We use state to hold cumulative reward / step
            step_disp = gr.HTML(make_stat_box("-", "Current Step"))
            reward_disp = gr.HTML(make_stat_box("-", "Cum. Reward"))

        # ─── MAIN INTERFACE ───────────────────────────────────────────────────
        with gr.Row():
            # LEFT COLUMN: Interactive Demo
            with gr.Column(scale=2):
                gr.Markdown("### 🎮 Interactive Demo – Try the Environment")
                
                with gr.Row():
                    task_dropdown = gr.Dropdown(
                        choices=["access_decision", "jit_escalation", "access_review"],
                        value="access_decision",
                        label="Task",
                        container=False,
                        scale=3
                    )
                    difficulty_dropdown = gr.Dropdown(
                        choices=["Difficulty 1", "Difficulty 2", "Difficulty 3"],
                        value="Difficulty 1",
                        label="Difficulty",
                        container=False,
                        scale=2
                    )
                    seed_input = gr.Number(value=42, label="Seed", precision=0, container=False, scale=1)
                    reset_btn = gr.Button("🔄 Reset Episode", variant="huggingface") # Blue/Indigo variant
                    step_btn = gr.Button("▶ Step", variant="primary") # Green accent variant

                with gr.Row():
                    tool_dropdown = gr.Dropdown(
                        choices=[
                            "policy.lookup", "policy.list",
                            "org.get_user", "org.get_manager", "org.list_users",
                            "entitlement.list", "entitlement.inspect", "entitlement.revoke",
                            "request.view", "request.list",
                            "approval.route", "approval.check_status",
                            "access.decide", "access.grant", "access.set_ttl",
                            "audit.query", "group.resolve", "workflow.check_active", "review.submit"
                        ], 
                        label="Tool Call",
                        scale=2
                    )
                    last_result = gr.Textbox(label="Last Tool Result", interactive=False, lines=1)

                args_input = gr.Textbox(label="Arguments (JSON)", value="{}", lines=2)
                
                gr.Markdown("**Episode Log**")
                episode_log = gr.HTML('<div id="episode-log" class="yellow-text">Press "Reset Episode" to generate a scenario...</div>')

            # RIGHT COLUMN: Rewards & Overview
            with gr.Column(scale=1):
                gr.Markdown("### 🧠 PrivilegeDesk Agent Loop")
                gr.HTML("""
                <div style="background: #1e293b; padding: 15px; border-radius: 8px; border: 1px solid #334155;">
                    <div style="display: flex; justify-content: space-between; margin-bottom: 20px;">
                        <span style="background: #312e81; color: #a5b4fc; padding: 5px 10px; border-radius: 5px;">Actor<br/><small>LLM generates</small></span>
                        <span style="color: #cbd5e1; align-self: center;">→</span>
                        <span style="background: #0284c7; color: #bae6fd; padding: 5px 10px; border-radius: 5px;">Execute<br/><small>Tool call</small></span>
                        <span style="color: #cbd5e1; align-self: center;">→</span>
                        <span style="background: #065f46; color: #a7f3d0; padding: 5px 10px; border-radius: 5px;">Reflect<br/><small>Update memory</small></span>
                    </div>
                    <ul style="color: #cbd5e1; font-size: 0.9rem; padding-left: 20px;">
                        <li><b>Goal Inference</b> – Read request/audit logs</li>
                        <li><b>Policy Verification</b> – Cross-reference IAM rules</li>
                        <li><b>Action Execution</b> – Approve/Deny/Revoke</li>
                    </ul>
                </div>
                """)

                gr.Markdown("### 🎯 Grading Rubrics (Subgoals)")
                gr.HTML("""
                <div style="background: #1e293b; padding: 15px; border-radius: 8px; border: 1px solid #334155; font-size: 0.85em; color: #cbd5e1;">
                    <div style="margin-bottom: 10px;"><b>Task 1: Access Decision (Easy)</b><br/>View Req → Check Entitlements → Policy Lookup → Decide</div>
                    <div style="margin-bottom: 10px;"><b>Task 2: JIT Escalation (Medium)</b><br/>Route Approval → Attach Ticket → Set TTL → Grant</div>
                    <div><b>Task 3: Access Review (Hard)</b><br/>Audit Usage → Resolve Groups → Test Workflows → Revoke Risks</div>
                </div>
                """)

        # ─── TOOL INVENTORY ───────────────────────────────────────────────────
        gr.Markdown("### 🔧 Tool Inventory – 19 Tools")
        gr.HTML("""
        <div style="background: #1e293b; padding: 20px; border-radius: 8px; border: 1px solid #334155;">
            <div class="tool-group">
                <h4>POLICY (2)</h4>
                <span class="tool-tag">policy.lookup</span> <span class="tool-tag">policy.list</span>
            </div>
            <div class="tool-group">
                <h4>ORGANIZATION (3)</h4>
                <span class="tool-tag">org.get_user</span> <span class="tool-tag">org.get_manager</span> <span class="tool-tag">org.list_users</span>
            </div>
            <div class="tool-group">
                <h4>ENTITLEMENTS & GROUPS (4)</h4>
                <span class="tool-tag">entitlement.list</span> <span class="tool-tag">entitlement.inspect</span> <span class="tool-tag">entitlement.revoke</span> <span class="tool-tag">group.resolve</span>
            </div>
            <div class="tool-group">
                <h4>REQUEST & APPROVAL (4)</h4>
                <span class="tool-tag">request.view</span> <span class="tool-tag">request.list</span> <span class="tool-tag">approval.route</span> <span class="tool-tag">approval.check_status</span>
            </div>
            <div class="tool-group">
                <h4>ACCESS CONTROL (3)</h4>
                <span class="tool-tag">access.decide</span> <span class="tool-tag">access.grant</span> <span class="tool-tag">access.set_ttl</span>
            </div>
            <div class="tool-group">
                <h4>AUDIT & WORKFLOW (3)</h4>
                <span class="tool-tag">audit.query</span> <span class="tool-tag">workflow.check_active</span> <span class="tool-tag">review.submit</span>
            </div>
        </div>
        """)

        # State definitions
        # Local mirror of what would happen via FastApi requests so that
        # the UI is perfectly synced with Server app instance
        state_log = gr.State([])
        state_steps = gr.State(0)
        state_reward = gr.State(0.0)

        # ─── LOGIC BINDINGS ───────────────────────────────────────────────────

        def format_log(logs):
            html = ""
            for l in logs:
                html += f"<div>> {l}</div>"
            if not html:
                html = "Waiting for episode start..."
            return f'<div id="episode-log">{html}</div>'

        def on_reset(task, diff, seed):
            import requests # we will call our own endpoints locally
            diff_level = int(diff.split(" ")[1])
            res = requests.post("http://127.0.0.1:8000/reset", json={
                "task_id": task,
                "difficulty_level": diff_level,
                "seed": int(seed) if seed else 42
            })
            if res.status_code == 200:
                data = res.json()
                init_obs = json.dumps(data.get("observation", {}), indent=2)
                logs = [f"Episode reset. Task: {task}", f"Observation: {init_obs}"]
                return format_log(logs), logs, "Env reset successful.", make_stat_box("0", "Current Step"), make_stat_box("0.0", "Cum. Reward"), 0, 0.0
            else:
                return format_log([f"Error resetting: {res.text}"]), [], "Failed to reset.", make_stat_box("-", "Current Step"), make_stat_box("-", "Cum. Reward"), 0, 0.0

        def on_step(tool_name, args_str, current_logs, current_steps, current_reward):
            import requests
            try:
                args = json.loads(args_str)
            except:
                logs = current_logs + ["Error: Arguments must be valid JSON"]
                return format_log(logs), logs, "Invalid JSON", make_stat_box(str(current_steps), "Current Step"), make_stat_box(f"{current_reward:.2f}", "Cum. Reward"), current_steps, current_reward
            
            res = requests.post("http://127.0.0.1:8000/step", json={
                "action": {"tool_name": tool_name, "arguments": args}
            })
            
            if res.status_code == 200:
                data = res.json()
                obs = json.dumps(data.get("observation", {}), indent=2)
                rew = data.get("reward", 0.0)
                done = data.get("done", False)
                info = data.get("info", {})
                
                step_val = current_steps + 1
                rew_val = current_reward + rew
                
                new_logs = current_logs + [
                    f"Action: {tool_name}({args_str})",
                    f"Reward: {rew} | Terminated: {done}",
                    f"Observation: {obs[:300]}{'...' if len(obs) > 300 else ''}"
                ]
                
                if done:
                    # fetch grader
                    grade_res = requests.post("http://127.0.0.1:8000/grader")
                    if grade_res.status_code == 200:
                        score = grade_res.json().get("score", 0.0)
                        new_logs.append(f"Episode Done. Final Score: {score}")

                return (
                    format_log(new_logs),
                    new_logs,
                    "Step successful.",
                    make_stat_box(str(step_val), "Current Step"), 
                    make_stat_box(f"{rew_val:.2f}", "Cum. Reward"),
                    step_val, 
                    rew_val
                )
            else:
                logs = current_logs + [f"Error on step: {res.text}"]
                return format_log(logs), logs, "Step Failed", make_stat_box(str(current_steps), "Current Step"), make_stat_box(f"{current_reward:.2f}", "Cum. Reward"), current_steps, current_reward


        reset_btn.click(
            on_reset,
            inputs=[task_dropdown, difficulty_dropdown, seed_input],
            outputs=[episode_log, state_log, last_result, step_disp, reward_disp, state_steps, state_reward]
        )

        step_btn.click(
            on_step,
            inputs=[tool_dropdown, args_input, state_log, state_steps, state_reward],
            outputs=[episode_log, state_log, last_result, step_disp, reward_disp, state_steps, state_reward]
        )

    return demo