use serde::{Deserialize, Serialize};

use crate::SourceRange;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum StackFrameKind {
    Current,
    Caller,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct StackFrame {
    pub kind: StackFrameKind,
    /// Current instruction or caller's saved return address.
    pub instruction_pointer: usize,
    /// Instruction mapped to source (the call instruction for a caller).
    pub source_instruction_pointer: Option<usize>,
    pub function: Option<String>,
    pub range: Option<SourceRange>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct ExecutionInspection {
    pub vm_steps: u64,
    pub awaiting: bool,
    pub call_depth: usize,
    pub frames: Vec<StackFrame>,
    pub frames_truncated: bool,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct SourceBreakpoint {
    /// Zero-based line in the exact installed source. Empty addresses mean unverified.
    pub line: usize,
    pub instruction_pointers: Vec<usize>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum DebugStopReason {
    Breakpoint,
    Step,
    Budget,
    Awaiting,
    Completed,
    Failed,
    Removed,
}

#[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct DebuggerSnapshot {
    pub breakpoints: Vec<SourceBreakpoint>,
    pub stop_reason: Option<DebugStopReason>,
}