//! Company endpoints — deploy a baseline topology staffed with real *teams*,
//! then run it on the durable recursive runner. The 3rd rung of the deploy
//! ladder (single → team → company → org). Unlike teams, creating a company
//! provisions nothing new: it composes teams that already own provisioned claws.

use axum::extract::{Path, State};
use axum::http::StatusCode;
use axum::Json;
use cm_topology::{build, TopologyKind};
use serde::{Deserialize, Serialize};
use serde_json::Value;
use time::format_description::well_known::Rfc3339;
use uuid::Uuid;

use crate::{ApiError, AppState, Authed};

/// One bound team in the company (becomes a topology node).
#[derive(Deserialize)]
pub struct CompanyMemberInput {
    pub team_id: Uuid,
    #[serde(default)]
    pub role: String,
}

#[derive(Deserialize)]
pub struct CreateCompanyRequest {
    pub name: String,
    /// TopologyKind (snake_case), e.g. "hierarchical", "pipeline".
    pub kind: String,
    pub members: Vec<CompanyMemberInput>,
    /// Optional parent org id. When set, the new company is bound under
    /// this org via `orgs::add_company` inside the same handler so the
    /// company never lands orphaned. Wizards fetch this via
    /// `POST /api/structure/ensure-chain`.
    #[serde(default)]
    pub attach_to_org_id: Option<Uuid>,
}

#[derive(Serialize)]
pub struct CompanyCreated {
    pub company_id: String,
}

fn parse_kind(s: &str) -> Result<TopologyKind, ApiError> {
    serde_json::from_value(Value::String(s.to_string())).map_err(|_| ApiError::BadRequest)
}

/// `POST /api/companies` — build the baseline topology over the chosen teams,
/// bind each node to its team, and persist. Validates every team belongs to the
/// workspace first (so a company can only compose teams the caller owns).
pub async fn create_company(
    State(state): State<AppState>,
    Authed(user): Authed,
    Json(body): Json<CreateCompanyRequest>,
) -> Result<(StatusCode, Json<CompanyCreated>), ApiError> {
    if body.members.is_empty() {
        return Err(ApiError::BadRequest);
    }
    let kind = parse_kind(&body.kind)?;

    // 1. Validate each bound team is real + in this workspace.
    for m in &body.members {
        cm_db::repo::teams::get_team(&state.pool, m.team_id, user.workspace_id).await?;
    }

    // 2. Build the topology and bind each node to its team. We write the team id
    //    into BOTH attrs["team_id"] (descriptive) and attrs["agent"] (so the
    //    orchestrator forwards it through TurnRequest exactly like a claw alias).
    let roles: Vec<&str> = body
        .members
        .iter()
        .map(|m| {
            if m.role.is_empty() {
                "team"
            } else {
                m.role.as_str()
            }
        })
        .collect();
    let mut graph = build(kind, &roles).map_err(|_| ApiError::BadRequest)?;
    for (i, node) in graph.nodes.iter_mut().enumerate() {
        if let Some(m) = body.members.get(i) {
            node.attrs.insert("team_id".into(), m.team_id.to_string());
            node.attrs.insert("agent".into(), m.team_id.to_string());
        }
    }

    // 3. Persist company + node→team bindings.
    let company_id = Uuid::now_v7();
    let graph_json = serde_json::to_value(&graph).map_err(|_| ApiError::Internal)?;
    cm_db::repo::companies::insert_company(
        &state.pool,
        company_id,
        user.workspace_id,
        &body.name,
        kind.as_str(),
        &graph_json,
    )
    .await?;
    for (i, node) in graph.nodes.iter().enumerate() {
        if let Some(m) = body.members.get(i) {
            cm_db::repo::companies::add_team(
                &state.pool,
                company_id,
                &node.id,
                m.team_id,
                &node.role,
            )
            .await?;
        }
    }

    // Auto-parent under the caller's ensured org, mirroring create_team's
    // attach_to_company_id pattern. Ownership-checked; skipped when the
    // caller didn't run ensure-chain.
    if let Some(org_id) = body.attach_to_org_id {
        let org = cm_db::repo::orgs::get(&state.pool, org_id, user.workspace_id)
            .await
            .map_err(|_| ApiError::NotFound)?;
        let existing = cm_db::repo::orgs::companies_for_org(&state.pool, org.id).await?;
        let node_id = format!("n{}", existing.len());
        cm_db::repo::orgs::add_company(&state.pool, org.id, &node_id, company_id, "company")
            .await?;
    }

    Ok((
        StatusCode::CREATED,
        Json(CompanyCreated {
            company_id: company_id.to_string(),
        }),
    ))
}

#[derive(Deserialize)]
pub struct PatchCompanyRequest {
    /// New TopologyKind (snake_case).
    pub kind: String,
}

/// `PATCH /api/companies/{id}` — change a company's topology: rebuild the graph
/// over its bound teams (stable node ids keep the node→team bindings) + persist.
pub async fn patch_company(
    State(state): State<AppState>,
    Authed(user): Authed,
    Path(id): Path<Uuid>,
    Json(body): Json<PatchCompanyRequest>,
) -> Result<StatusCode, ApiError> {
    let company = cm_db::repo::companies::get(&state.pool, id, user.workspace_id).await?;
    let kind = parse_kind(&body.kind)?;
    let bindings = cm_db::repo::companies::teams_for_company(&state.pool, company.id).await?;

    let by_node: std::collections::HashMap<String, (Uuid, String)> = bindings
        .into_iter()
        .map(|b| (b.node_id, (b.team_id, b.role)))
        .collect();
    let n = by_node.len();
    let roles: Vec<String> = (0..n)
        .map(|i| {
            by_node
                .get(&format!("n{i}"))
                .map(|(_, r)| r.clone())
                .unwrap_or_else(|| "team".into())
        })
        .collect();
    let role_refs: Vec<&str> = roles.iter().map(String::as_str).collect();
    let mut graph = build(kind, &role_refs).map_err(|_| ApiError::BadRequest)?;
    for node in graph.nodes.iter_mut() {
        if let Some((tid, _)) = by_node.get(&node.id) {
            node.attrs.insert("team_id".into(), tid.to_string());
            node.attrs.insert("agent".into(), tid.to_string());
        }
    }
    let graph_json = serde_json::to_value(&graph).map_err(|_| ApiError::Internal)?;
    cm_db::repo::companies::set_topology(
        &state.pool,
        company.id,
        user.workspace_id,
        kind.as_str(),
        &graph_json,
    )
    .await?;
    Ok(StatusCode::NO_CONTENT)
}

/// `PATCH /api/companies/{id}/name` — inline rename from the sidebar.
#[derive(Deserialize)]
pub struct RenameCompanyRequest {
    pub name: String,
}
pub async fn rename_company(
    State(state): State<AppState>,
    Authed(user): Authed,
    Path(id): Path<Uuid>,
    Json(body): Json<RenameCompanyRequest>,
) -> Result<StatusCode, ApiError> {
    let name = body.name.trim();
    if name.is_empty() {
        return Err(ApiError::BadRequest);
    }
    cm_db::repo::companies::rename_company(&state.pool, id, user.workspace_id, name).await?;
    Ok(StatusCode::NO_CONTENT)
}

/// `DELETE /api/companies/{id}` — remove a company (its teams remain).
pub async fn delete_company(
    State(state): State<AppState>,
    Authed(user): Authed,
    Path(id): Path<Uuid>,
) -> Result<StatusCode, ApiError> {
    cm_db::repo::companies::delete_company(&state.pool, id, user.workspace_id).await?;
    Ok(StatusCode::NO_CONTENT)
}

#[derive(Serialize)]
pub struct CompanySummaryOut {
    pub id: String,
    pub name: String,
    pub kind: String,
    pub status: String,
    pub created_at: String,
}

/// `GET /api/companies` — recent companies for the workspace.
pub async fn list_companies(
    State(state): State<AppState>,
    Authed(user): Authed,
) -> Result<Json<Vec<CompanySummaryOut>>, ApiError> {
    let rows =
        cm_db::repo::companies::list_for_workspace(&state.pool, user.workspace_id, 50).await?;
    Ok(Json(
        rows.into_iter()
            .map(|c| CompanySummaryOut {
                id: c.id.to_string(),
                name: c.name,
                kind: c.kind,
                status: c.status,
                created_at: c.created_at.format(&Rfc3339).unwrap_or_default(),
            })
            .collect(),
    ))
}

#[derive(Serialize)]
pub struct CompanyTeamOut {
    pub node_id: String,
    pub team_id: String,
    pub role: String,
}

#[derive(Serialize)]
pub struct CompanyDetail {
    pub id: String,
    pub name: String,
    pub kind: String,
    pub status: String,
    pub created_at: String,
    pub graph: Value,
    pub members: Vec<CompanyTeamOut>,
}

/// `GET /api/companies/{id}` — a company's graph + node→team bindings.
pub async fn get_company(
    State(state): State<AppState>,
    Authed(user): Authed,
    Path(id): Path<Uuid>,
) -> Result<Json<CompanyDetail>, ApiError> {
    let company = cm_db::repo::companies::get(&state.pool, id, user.workspace_id).await?;
    let members = cm_db::repo::companies::teams_for_company(&state.pool, id).await?;
    Ok(Json(CompanyDetail {
        id: company.id.to_string(),
        name: company.name,
        kind: company.kind,
        status: company.status,
        created_at: company.created_at.format(&Rfc3339).unwrap_or_default(),
        graph: company.graph,
        members: members
            .into_iter()
            .map(|m| CompanyTeamOut {
                node_id: m.node_id,
                team_id: m.team_id.to_string(),
                role: m.role,
            })
            .collect(),
    }))
}

#[derive(Deserialize)]
pub struct RunCompanyRequest {
    pub task: String,
}

#[derive(Serialize)]
pub struct RunAccepted {
    pub run_id: String,
    pub status: String,
}

/// `POST /api/companies/{id}/run` — enqueue a durable `company`-tier run; the
/// worker drives the recursive executor (each node runs its team's topology).
pub async fn run_company(
    State(state): State<AppState>,
    Authed(user): Authed,
    Path(id): Path<Uuid>,
    Json(body): Json<RunCompanyRequest>,
) -> Result<(StatusCode, Json<RunAccepted>), ApiError> {
    let company = cm_db::repo::companies::get(&state.pool, id, user.workspace_id).await?;
    crate::quota::enforce_new_run(&state, user.workspace_id).await?;
    let run_id = Uuid::now_v7();
    cm_db::repo::topology_runs::enqueue_run_tier(
        &state.pool,
        run_id,
        user.workspace_id,
        &body.task,
        &company.graph,
        "company",
    )
    .await?;
    Ok((
        StatusCode::ACCEPTED,
        Json(RunAccepted {
            run_id: run_id.to_string(),
            status: "queued".into(),
        }),
    ))
}