//! AI Workflow Builder - Comprehensive AI agent orchestration and debugging components
//!
//! This module provides tools for building, monitoring, and debugging AI workflows
//! including multi-agent orchestration, prompt chains, and execution tracing.

use crate::theme;
use cvkg_core::{
    Never, Rect, Renderer, Size, View,
    layout::{LayoutCache, LayoutView, SizeProposal},
};

/// Multi-agent orchestration panel for managing agent workflows
/// Displays agent tasks with status visualization and progress tracking
pub struct MultiAgentPanel {
    pub agents: Vec<AgentInfo>,
    pub title: String,
}

/// Agent information for orchestration display
pub struct AgentInfo {
    pub id: String,
    pub name: String,
    pub status: AgentStatus,
    pub progress: f32,
    pub current_task: String,
}

/// Agent execution status
pub enum AgentStatus {
    Idle,
    Running,
    Completed,
    Failed,
    Waiting,
}

impl MultiAgentPanel {
    /// Create a new multi-agent panel with a title
    pub fn new(title: &str) -> Self {
        Self {
            agents: Vec::new(),
            title: title.to_string(),
        }
    }

    /// Add an agent to the panel
    pub fn agent(mut self, id: &str, name: &str, status: AgentStatus) -> Self {
        self.agents.push(AgentInfo {
            id: id.to_string(),
            name: name.to_string(),
            status,
            progress: 0.0,
            current_task: String::new(),
        });
        self
    }

    /// Set agent progress
    pub fn progress(mut self, id: &str, progress: f32, task: &str) -> Self {
        if let Some(agent) = self.agents.iter_mut().find(|a| a.id == id) {
            agent.progress = progress;
            agent.current_task = task.to_string();
        }
        self
    }
}

impl View for MultiAgentPanel {
    type Body = Never;
    fn body(self) -> Self::Body {
        unreachable!()
    }

    fn render(&self, renderer: &mut dyn Renderer, rect: Rect) {
        // Header
        renderer.fill_rect(
            Rect {
                x: rect.x,
                y: rect.y,
                width: rect.width,
                height: 32.0,
            },
            theme::surface_elevated(),
        );
        renderer.draw_text(
            &self.title,
            rect.x + 12.0,
            rect.y + 11.0,
            14.0,
            theme::text(),
        );

        // Agent list
        let row_h = 44.0;
        let mut current_y = rect.y + 38.0;
        for agent in &self.agents {
            let agent_rect = Rect {
                x: rect.x,
                y: current_y,
                width: rect.width,
                height: row_h,
            };

            // Background
            let bg = match agent.status {
                AgentStatus::Idle => theme::surface(),
                AgentStatus::Running => theme::status_running(),
                AgentStatus::Completed => theme::status_completed(),
                AgentStatus::Failed => theme::status_failed(),
                AgentStatus::Waiting => theme::status_waiting(),
            };
            renderer.fill_rect(agent_rect, bg);

            // Agent name
            renderer.draw_text(
                &agent.name,
                agent_rect.x + 12.0,
                agent_rect.y + 8.0,
                12.0,
                theme::text(),
            );

            // SkollProgress bar
            let progress_w = (agent_rect.width - 140.0) * agent.progress;
            renderer.fill_rect(
                Rect {
                    x: agent_rect.x + 12.0,
                    y: agent_rect.y + 28.0,
                    width: progress_w.max(0.0),
                    height: 4.0,
                },
                theme::accent(),
            );
            renderer.stroke_rect(
                Rect {
                    x: agent_rect.x + 12.0,
                    y: agent_rect.y + 28.0,
                    width: agent_rect.width - 140.0,
                    height: 4.0,
                },
                theme::border(),
                1.0,
            );

            // Status indicator
            let (status_text, status_color) = match agent.status {
                AgentStatus::Idle => ("○", theme::status_waiting()),
                AgentStatus::Running => ("◐", theme::status_running()),
                AgentStatus::Completed => ("✓", theme::status_completed()),
                AgentStatus::Failed => ("✗", theme::status_failed()),
                AgentStatus::Waiting => ("…", theme::status_waiting()),
            };
            renderer.draw_text(
                status_text,
                agent_rect.x + agent_rect.width - 20.0,
                agent_rect.y + 24.0,
                14.0,
                status_color,
            );

            current_y += row_h;
        }
    }
}

impl LayoutView for MultiAgentPanel {
    fn size_that_fits(
        &self,
        _proposal: SizeProposal,
        _subviews: &[&dyn LayoutView],
        _cache: &mut LayoutCache,
    ) -> Size {
        Size {
            width: 320.0,
            height: 40.0 + self.agents.len() as f32 * 44.0,
        }
    }
    fn place_subviews(
        &self,
        _bounds: Rect,
        _subviews: &mut [&mut dyn LayoutView],
        _cache: &mut LayoutCache,
    ) {
    }
}

/// Prompt chain visualizer for displaying prompt sequences
pub struct PromptChainVisualizer {
    pub prompts: Vec<PromptStep>,
    pub _current_step: usize,
}

/// A single prompt step in a chain
pub struct PromptStep {
    pub id: String,
    pub name: String,
    pub status: PromptStatus,
    pub input_tokens: usize,
    pub output_tokens: usize,
    pub latency_ms: f32,
}

/// Prompt execution status
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum PromptStatus {
    Pending,
    Running,
    Completed,
    Failed,
}

impl Default for PromptChainVisualizer {
    fn default() -> Self {
        Self::new()
    }
}

impl PromptChainVisualizer {
    pub fn new() -> Self {
        Self {
            prompts: Vec::new(),
            _current_step: 0,
        }
    }

    pub fn step(mut self, id: &str, name: &str) -> Self {
        self.prompts.push(PromptStep {
            id: id.to_string(),
            name: name.to_string(),
            status: PromptStatus::Pending,
            input_tokens: 0,
            output_tokens: 0,
            latency_ms: 0.0,
        });
        self
    }

    pub fn running(mut self, id: &str, input_tokens: usize) -> Self {
        if let Some(step) = self.prompts.iter_mut().find(|s| s.id == id) {
            step.status = PromptStatus::Running;
            step.input_tokens = input_tokens;
        }
        self
    }

    pub fn completed(mut self, id: &str, output_tokens: usize, latency_ms: f32) -> Self {
        if let Some(step) = self.prompts.iter_mut().find(|s| s.id == id) {
            step.status = PromptStatus::Completed;
            step.output_tokens = output_tokens;
            step.latency_ms = latency_ms;
        }
        self
    }
}

impl View for PromptChainVisualizer {
    type Body = Never;
    fn body(self) -> Self::Body {
        unreachable!()
    }

    fn render(&self, renderer: &mut dyn Renderer, rect: Rect) {
        for (i, step) in self.prompts.iter().enumerate() {
            let y = rect.y + 30.0 + i as f32 * 36.0;

            let color = match step.status {
                PromptStatus::Pending => theme::status_waiting(),
                PromptStatus::Running => theme::status_running(),
                PromptStatus::Completed => theme::status_completed(),
                PromptStatus::Failed => theme::status_failed(),
            };

            renderer.fill_rounded_rect(
                Rect {
                    x: rect.x,
                    y,
                    width: rect.width,
                    height: 30.0,
                },
                4.0,
                color,
            );

            renderer.draw_text(&step.name, rect.x + 8.0, y + 9.0, 11.0, theme::text());

            if step.status == PromptStatus::Completed {
                renderer.draw_text(
                    &format!(
                        "out: {} tok, {}ms",
                        step.output_tokens, step.latency_ms as i32
                    ),
                    rect.x + rect.width - 120.0,
                    y + 9.0,
                    9.0,
                    theme::text_muted(),
                );
            }
        }
    }
}

impl LayoutView for PromptChainVisualizer {
    fn size_that_fits(
        &self,
        _proposal: SizeProposal,
        _subviews: &[&dyn LayoutView],
        _cache: &mut LayoutCache,
    ) -> Size {
        Size {
            width: 280.0,
            height: 10.0 + self.prompts.len() as f32 * 36.0,
        }
    }
    fn place_subviews(
        &self,
        _bounds: Rect,
        _subviews: &mut [&mut dyn LayoutView],
        _cache: &mut LayoutCache,
    ) {
    }
}

/// Memory graph viewer for visualizing memory relationships
pub struct MemoryGraphViewer {
    pub nodes: Vec<MemoryNode>,
    pub edges: Vec<MemoryEdge>,
}

/// Memory node in the graph
pub struct MemoryNode {
    pub id: String,
    pub label: String,
    pub weight: f32,
    pub node_type: NodeType,
}

/// Memory edge connecting nodes
pub struct MemoryEdge {
    pub from: String,
    pub to: String,
    pub strength: f32,
}

/// Type of memory node
pub enum NodeType {
    Concept,
    Entity,
    Relation,
    Context,
}

impl Default for MemoryGraphViewer {
    fn default() -> Self {
        Self::new()
    }
}

impl MemoryGraphViewer {
    pub fn new() -> Self {
        Self {
            nodes: Vec::new(),
            edges: Vec::new(),
        }
    }

    pub fn node(mut self, id: &str, label: &str, weight: f32, node_type: NodeType) -> Self {
        self.nodes.push(MemoryNode {
            id: id.to_string(),
            label: label.to_string(),
            weight,
            node_type,
        });
        self
    }

    pub fn edge(mut self, from: &str, to: &str, strength: f32) -> Self {
        self.edges.push(MemoryEdge {
            from: from.to_string(),
            to: to.to_string(),
            strength,
        });
        self
    }
}

impl View for MemoryGraphViewer {
    type Body = Never;
    fn body(self) -> Self::Body {
        unreachable!()
    }

    fn render(&self, renderer: &mut dyn Renderer, rect: Rect) {
        // Draw edges
        for edge in &self.edges {
            if let (Some(from_idx), Some(to_idx)) = (
                self.nodes.iter().position(|n| n.id == edge.from),
                self.nodes.iter().position(|n| n.id == edge.to),
            ) {
                let x1 = rect.x + 50.0 + from_idx as f32 * 60.0;
                let y1 = rect.y + rect.height / 2.0;
                let x2 = rect.x + 50.0 + to_idx as f32 * 60.0;
                let y2 = y1;
                renderer.draw_line(x1, y1, x2, y2, theme::border(), 1.5);
            }
        }

        // Draw nodes
        for (i, node) in self.nodes.iter().enumerate() {
            let cx = rect.x + 50.0 + i as f32 * 60.0;
            let cy = rect.y + rect.height / 2.0;
            let radius = 15.0 + node.weight * 10.0;

            let color = match node.node_type {
                NodeType::Concept => theme::node_concept(),
                NodeType::Entity => theme::node_entity(),
                NodeType::Relation => theme::node_relation(),
                NodeType::Context => theme::node_context(),
            };

            let node_rect = Rect {
                x: cx - radius,
                y: cy - radius,
                width: radius * 2.0,
                height: radius * 2.0,
            };
            renderer.fill_ellipse(node_rect, color);
            renderer.stroke_ellipse(node_rect, theme::border_strong(), 2.0);
            renderer.draw_text(
                &node.label,
                cx - 20.0,
                cy + radius + 4.0,
                10.0,
                theme::text(),
            );
        }
    }
}

impl LayoutView for MemoryGraphViewer {
    fn size_that_fits(
        &self,
        _proposal: SizeProposal,
        _subviews: &[&dyn LayoutView],
        _cache: &mut LayoutCache,
    ) -> Size {
        Size {
            width: 400.0,
            height: 200.0,
        }
    }
    fn place_subviews(
        &self,
        _bounds: Rect,
        _subviews: &mut [&mut dyn LayoutView],
        _cache: &mut LayoutCache,
    ) {
    }
}

/// Token streaming viewer for real-time token visualization
pub struct TokenStreamViewer {
    pub tokens: Vec<TokenInfo>,
    pub is_streaming: bool,
}

/// Individual token information
pub struct TokenInfo {
    pub text: String,
    pub token_type: TokenType,
}

/// Token type classification
pub enum TokenType {
    Word,
    Punctuation,
    Space,
    NewLine,
}

impl Default for TokenStreamViewer {
    fn default() -> Self {
        Self::new()
    }
}

impl TokenStreamViewer {
    pub fn new() -> Self {
        Self {
            tokens: Vec::new(),
            is_streaming: false,
        }
    }

    pub fn token(mut self, text: &str, token_type: TokenType) -> Self {
        self.tokens.push(TokenInfo {
            text: text.to_string(),
            token_type,
        });
        self
    }

    pub fn streaming(mut self, streaming: bool) -> Self {
        self.is_streaming = streaming;
        self
    }
}

impl View for TokenStreamViewer {
    type Body = Never;
    fn body(self) -> Self::Body {
        unreachable!()
    }

    fn render(&self, renderer: &mut dyn Renderer, rect: Rect) {
        let mut current_x = rect.x + 10.0;
        let y = rect.y + 20.0;

        for token in &self.tokens {
            let color = match token.token_type {
                TokenType::Word => theme::text(),
                TokenType::Punctuation => theme::warning(),
                TokenType::Space => theme::text_dim(),
                TokenType::NewLine => theme::text_dim(),
            };
            renderer.draw_text(&token.text, current_x, y, 12.0, color);
            current_x += token.text.len() as f32 * 7.0;
        }

        if self.is_streaming {
            renderer.draw_text("▋", current_x, y, 12.0, theme::accent());
        }
    }
}

impl LayoutView for TokenStreamViewer {
    fn size_that_fits(
        &self,
        _proposal: SizeProposal,
        _subviews: &[&dyn LayoutView],
        _cache: &mut LayoutCache,
    ) -> Size {
        Size {
            width: 400.0,
            height: 40.0,
        }
    }
    fn place_subviews(
        &self,
        _bounds: Rect,
        _subviews: &mut [&mut dyn LayoutView],
        _cache: &mut LayoutCache,
    ) {
    }
}

/// Reasoning trace inspector for debugging AI decision paths
pub struct ReasoningTraceInspector {
    pub steps: Vec<ReasoningStep>,
}

/// A single reasoning step
pub struct ReasoningStep {
    pub id: String,
    pub description: String,
    pub confidence: f32,
    pub conclusion: String,
}

impl Default for ReasoningTraceInspector {
    fn default() -> Self {
        Self::new()
    }
}

impl ReasoningTraceInspector {
    pub fn new() -> Self {
        Self { steps: Vec::new() }
    }

    pub fn step(mut self, id: &str, description: &str, confidence: f32, conclusion: &str) -> Self {
        self.steps.push(ReasoningStep {
            id: id.to_string(),
            description: description.to_string(),
            confidence,
            conclusion: conclusion.to_string(),
        });
        self
    }
}

impl View for ReasoningTraceInspector {
    type Body = Never;
    fn body(self) -> Self::Body {
        unreachable!()
    }

    fn render(&self, renderer: &mut dyn Renderer, rect: Rect) {
        for (i, step) in self.steps.iter().enumerate() {
            let y = rect.y + 25.0 + i as f32 * 50.0;

            // Step header
            renderer.fill_rect(
                Rect {
                    x: rect.x,
                    y,
                    width: rect.width,
                    height: 20.0,
                },
                theme::surface_elevated(),
            );
            renderer.draw_text(
                &step.description,
                rect.x + 8.0,
                y + 6.0,
                11.0,
                theme::text(),
            );

            // Confidence bar
            let conf_w = (rect.width - 20.0) * step.confidence;
            renderer.fill_rect(
                Rect {
                    x: rect.x + 8.0,
                    y: y + 30.0,
                    width: conf_w,
                    height: 4.0,
                },
                theme::success(),
            );

            // Conclusion
            renderer.draw_text(
                &step.conclusion,
                rect.x + 8.0,
                y + 42.0,
                10.0,
                theme::text_muted(),
            );
        }
    }
}

impl LayoutView for ReasoningTraceInspector {
    fn size_that_fits(
        &self,
        _proposal: SizeProposal,
        _subviews: &[&dyn LayoutView],
        _cache: &mut LayoutCache,
    ) -> Size {
        Size {
            width: 300.0,
            height: 10.0 + self.steps.len() as f32 * 50.0,
        }
    }
    fn place_subviews(
        &self,
        _bounds: Rect,
        _subviews: &mut [&mut dyn LayoutView],
        _cache: &mut LayoutCache,
    ) {
    }
}

/// Tool invocation inspector for monitoring tool calls
pub struct ToolInvocationInspector {
    pub invocations: Vec<ToolInvocation>,
}

/// A tool invocation record
pub struct ToolInvocation {
    pub id: String,
    pub tool_name: String,
    pub parameters: Vec<(String, String)>,
    pub result_preview: String,
    pub duration_ms: f32,
}

impl Default for ToolInvocationInspector {
    fn default() -> Self {
        Self::new()
    }
}

impl ToolInvocationInspector {
    pub fn new() -> Self {
        Self {
            invocations: Vec::new(),
        }
    }

    pub fn invocation(mut self, id: &str, tool_name: &str, duration_ms: f32, result: &str) -> Self {
        self.invocations.push(ToolInvocation {
            id: id.to_string(),
            tool_name: tool_name.to_string(),
            parameters: Vec::new(),
            result_preview: result.to_string(),
            duration_ms,
        });
        self
    }

    pub fn param(mut self, id: &str, key: &str, value: &str) -> Self {
        if let Some(inv) = self.invocations.iter_mut().find(|i| i.id == id) {
            inv.parameters.push((key.to_string(), value.to_string()));
        }
        self
    }
}

impl View for ToolInvocationInspector {
    type Body = Never;
    fn body(self) -> Self::Body {
        unreachable!()
    }

    fn render(&self, renderer: &mut dyn Renderer, rect: Rect) {
        for (i, inv) in self.invocations.iter().enumerate() {
            let y = rect.y + 30.0 + i as f32 * 40.0;

            renderer.fill_rounded_rect(
                Rect {
                    x: rect.x,
                    y,
                    width: rect.width,
                    height: 34.0,
                },
                3.0,
                theme::surface(),
            );

            renderer.draw_text(
                &format!("🔧 {}", inv.tool_name),
                rect.x + 10.0,
                y + 8.0,
                11.0,
                theme::text(),
            );
            renderer.draw_text(
                &format!("{}ms", inv.duration_ms as i32),
                rect.x + rect.width - 50.0,
                y + 8.0,
                10.0,
                theme::text_muted(),
            );
            renderer.draw_text(
                &inv.result_preview,
                rect.x + 10.0,
                y + 22.0,
                9.0,
                theme::text_muted(),
            );
        }
    }
}

impl LayoutView for ToolInvocationInspector {
    fn size_that_fits(
        &self,
        _proposal: SizeProposal,
        _subviews: &[&dyn LayoutView],
        _cache: &mut LayoutCache,
    ) -> Size {
        Size {
            width: 280.0,
            height: 10.0 + self.invocations.len() as f32 * 40.0,
        }
    }
    fn place_subviews(
        &self,
        _bounds: Rect,
        _subviews: &mut [&mut dyn LayoutView],
        _cache: &mut LayoutCache,
    ) {
    }
}

/// AI workflow builder for constructing agent workflows
pub struct AIWorkflowBuilder {
    pub nodes: Vec<WorkflowNode>,
    pub edges: Vec<WorkflowEdge>,
}

/// Workflow node
pub struct WorkflowNode {
    pub id: String,
    pub title: String,
    pub node_type: WorkflowNodeType,
    pub position: (f32, f32),
}

/// Workflow edge
pub struct WorkflowEdge {
    pub from: String,
    pub to: String,
}

/// Type of workflow node
pub enum WorkflowNodeType {
    Input,
    Process,
    Decision,
    Output,
    Agent,
}

impl Default for AIWorkflowBuilder {
    fn default() -> Self {
        Self::new()
    }
}

impl AIWorkflowBuilder {
    pub fn new() -> Self {
        Self {
            nodes: Vec::new(),
            edges: Vec::new(),
        }
    }

    pub fn node(
        mut self,
        id: &str,
        title: &str,
        node_type: WorkflowNodeType,
        pos: (f32, f32),
    ) -> Self {
        self.nodes.push(WorkflowNode {
            id: id.to_string(),
            title: title.to_string(),
            node_type,
            position: pos,
        });
        self
    }

    pub fn edge(mut self, from: &str, to: &str) -> Self {
        self.edges.push(WorkflowEdge {
            from: from.to_string(),
            to: to.to_string(),
        });
        self
    }
}

impl View for AIWorkflowBuilder {
    type Body = Never;
    fn body(self) -> Self::Body {
        unreachable!()
    }

    fn render(&self, renderer: &mut dyn Renderer, rect: Rect) {
        for edge in &self.edges {
            if let (Some(from), Some(to)) = (
                self.nodes.iter().find(|n| n.id == edge.from),
                self.nodes.iter().find(|n| n.id == edge.to),
            ) {
                let x1 = rect.x + from.position.0;
                let y1 = rect.y + from.position.1;
                let x2 = rect.x + to.position.0;
                let y2 = rect.y + to.position.1;
                renderer.draw_line(x1, y1, x2, y2, theme::border(), 2.0);
            }
        }

        for node in &self.nodes {
            let color = match node.node_type {
                WorkflowNodeType::Input => theme::node_concept(),
                WorkflowNodeType::Process => theme::accent(),
                WorkflowNodeType::Decision => theme::node_relation(),
                WorkflowNodeType::Output => theme::success(),
                WorkflowNodeType::Agent => theme::node_context(),
            };

            let cx = rect.x + node.position.0;
            let cy = rect.y + node.position.1;

            renderer.fill_rect(
                Rect {
                    x: cx - 40.0,
                    y: cy - 15.0,
                    width: 80.0,
                    height: 30.0,
                },
                color,
            );
            renderer.stroke_rect(
                Rect {
                    x: cx - 40.0,
                    y: cy - 15.0,
                    width: 80.0,
                    height: 30.0,
                },
                theme::border_strong(),
                1.0,
            );
            renderer.draw_text(&node.title, cx - 35.0, cy - 2.0, 10.0, theme::text());
        }
    }
}

impl LayoutView for AIWorkflowBuilder {
    fn size_that_fits(
        &self,
        _proposal: SizeProposal,
        _subviews: &[&dyn LayoutView],
        _cache: &mut LayoutCache,
    ) -> Size {
        Size {
            width: 600.0,
            height: 400.0,
        }
    }
    fn place_subviews(
        &self,
        _bounds: Rect,
        _subviews: &mut [&mut dyn LayoutView],
        _cache: &mut LayoutCache,
    ) {
    }
}

/// AI execution debugger for step-by-step debugging
pub struct AIExecutionDebugger {
    pub breakpoints: Vec<String>,
    pub _current_line: Option<String>,
}

impl Default for AIExecutionDebugger {
    fn default() -> Self {
        Self::new()
    }
}

impl AIExecutionDebugger {
    pub fn new() -> Self {
        Self {
            breakpoints: Vec::new(),
            _current_line: None,
        }
    }

    pub fn breakpoint(mut self, line: &str) -> Self {
        self.breakpoints.push(line.to_string());
        self
    }
}

impl View for AIExecutionDebugger {
    type Body = Never;
    fn body(self) -> Self::Body {
        unreachable!()
    }

    fn render(&self, renderer: &mut dyn Renderer, rect: Rect) {
        renderer.fill_rect(rect, theme::surface());
        renderer.draw_text(
            "AI Execution Debugger",
            rect.x + 10.0,
            rect.y + 20.0,
            14.0,
            theme::text(),
        );

        let y = rect.y + 45.0;
        for bp in &self.breakpoints {
            renderer.fill_rect(
                Rect {
                    x: rect.x + 10.0,
                    y,
                    width: rect.width - 20.0,
                    height: 22.0,
                },
                theme::surface(),
            );
            renderer.draw_text(
                &format!("● {}", bp),
                rect.x + 15.0,
                y + 15.0,
                11.0,
                theme::text_muted(),
            );
        }
    }
}

impl LayoutView for AIExecutionDebugger {
    fn size_that_fits(
        &self,
        _proposal: SizeProposal,
        _subviews: &[&dyn LayoutView],
        _cache: &mut LayoutCache,
    ) -> Size {
        Size {
            width: 300.0,
            height: 100.0,
        }
    }
    fn place_subviews(
        &self,
        _bounds: Rect,
        _subviews: &mut [&mut dyn LayoutView],
        _cache: &mut LayoutCache,
    ) {
    }
}
