// ── Procedure block definitions ────────────────────────────────────────────
//
// Blocks that define and call procedures:
//   WCProcedure — procedure definition (lives in Procedures tab)
//   WCProcCall  — procedure call block (lives in Algorithm tab)
//
// Each extends WCBlock (from wcblock.js).
//
// Load order dependencies:
//   wcblock.js  → WCBlock base class
//   helpers.js  → refreshProcOptions, findDataSource, resolveSourceName
//   dom.js      → $id
//   draw.js     → deleteLink


// ── WCProcedure — procedure definition ─────────────────────────────────────

class WCProcedure extends WCBlock {
  connectedCallback() {
    super.connectedCallback();
    this._el.name = this.querySelector(".proc-name");
    this._el.inputs = this.querySelector(".proc-inputs");
    this._el.outputs = this.querySelector(".proc-outputs");

    this.querySelector(".proc-add-input").addEventListener("click", () => {
      this._addParamRow(this._el.inputs, "in");
    });
    this.querySelector(".proc-add-output").addEventListener("click", () => {
      this._addParamRow(this._el.outputs, "out");
    });

    this._el.name.addEventListener("input", () => refreshProcOptions());
  }

  _addParamRow(container, dir) {
    const row = document.createElement("div");
    row.className = "proc-param-row";
    row.innerHTML =
      `<input class="proc-param-name" placeholder="name" value="">` +
      `<input class="proc-param-type" placeholder="type" value="scalar">` +
      `<button class="proc-param-del" title="remove">&times;</button>`;
    row.querySelector(".proc-param-del").addEventListener("click", () => {
      row.remove();
      refreshProcOptions();
    });
    for (const inp of row.querySelectorAll("input")) {
      inp.addEventListener("input", () => refreshProcOptions());
    }
    container.appendChild(row);
    refreshProcOptions();
  }

  getLibrary() {
    const pane = this.closest(".lib-pane");
    return pane ? pane.dataset.libName : "unknown";
  }

  getQualifiedName() {
    return this.getLibrary() + "/" + (this._el.name.value || "unnamed");
  }

  getInputParams() {
    return this._getParams(this._el.inputs);
  }

  getOutputParams() {
    return this._getParams(this._el.outputs);
  }

  _getParams(container) {
    return Array.from(container.querySelectorAll(".proc-param-row")).map(row => ({
      name: row.querySelector(".proc-param-name").value || "arg",
      type: row.querySelector(".proc-param-type").value || "scalar"
    }));
  }

  saveData() {
    return {
      library: this.getLibrary(),
      name: this._el.name.value,
      inputs: this.getInputParams(),
      outputs: this.getOutputParams()
    };
  }
  restoreData(d) {
    this._el.name.value = d.name || "proc";
    for (const p of (d.inputs || [])) {
      this._addParamRow(this._el.inputs, "in");
      const rows = this._el.inputs.querySelectorAll(".proc-param-row");
      const last = rows[rows.length - 1];
      last.querySelector(".proc-param-name").value = p.name || "arg";
      last.querySelector(".proc-param-type").value = p.type || "scalar";
    }
    for (const p of (d.outputs || [])) {
      this._addParamRow(this._el.outputs, "out");
      const rows = this._el.outputs.querySelectorAll(".proc-param-row");
      const last = rows[rows.length - 1];
      last.querySelector(".proc-param-name").value = p.name || "arg";
      last.querySelector(".proc-param-type").value = p.type || "scalar";
    }
  }

  generateOwnCode() { return ""; }
}


// ── WCProcCall — procedure call block ──────────────────────────────────────

class WCProcCall extends WCBlock {
  connectedCallback() {
    super.connectedCallback();
    this._el.select = this.querySelector(".proccall-select");
    this._el.nameInput = this.querySelector(".proccall-name");
    this._el.inputs = this.querySelector(".proccall-inputs");
    this._el.outputs = this.querySelector(".proccall-outputs");

    this._el.select.addEventListener("change", () => this._rebuildParams());
    this._initTimer = setTimeout(() => this._rebuildParams(), 0);
  }

  _rebuildParams() {
    const qname = this._el.select.dataset.restoredValue || this._el.select.value;

    for (const container of [this._el.inputs, this._el.outputs]) {
      for (const hook of container.querySelectorAll(".hook")) {
        const paths = [...document.querySelectorAll("path.flow, path.flow-data")];
        for (const path of paths) {
          if (path.fromHook === hook || path.toHook === hook) {
            deleteLink(path);
          }
        }
      }
    }
    this._el.inputs.innerHTML = "";
    this._el.outputs.innerHTML = "";

    if (!qname) return;

    for (const proc of document.querySelectorAll("wc-procedure")) {
      if (proc.getQualifiedName() === qname) {
        for (const p of proc.getInputParams()) {
          this._createArgField(this._el.inputs, p, "in");
        }
        for (const p of proc.getOutputParams()) {
          this._createArgField(this._el.outputs, p, "out");
        }
        break;
      }
    }
  }

  _createArgField(container, param, dir) {
    const row = document.createElement("div");
    row.className = "proccall-arg-row";

    const label = document.createElement("span");
    label.className = "proccall-arg-label";
    label.textContent = param.name + ":";

    const input = document.createElement("input");
    input.className = "proccall-arg-input";
    input.placeholder = param.name;
    input.dataset.dir = dir;
    input.dataset.paramName = param.name;
    input.dataset.paramType = param.type;

    const hook = document.createElement("button");
    hook.className = "hook";
    hook.dataset.direction = dir === "in" ? "in" : "out";
    hook.dataset.linkType = "data";
    hook.dataset.type = param.type;
    hook.dataset.exit = dir === "in" ? "left" : "right";
    hook.title = (dir === "in" ? "expects " : "") + param.type;

    if (dir === "in") {
      row.appendChild(hook);
      row.appendChild(label);
      row.appendChild(input);
    } else {
      row.appendChild(label);
      row.appendChild(input);
      row.appendChild(hook);
    }

    container.appendChild(row);
    this._setupHook(hook);
  }

  _sourceName(block) {
    const name = resolveSourceName(block);
    if (!name) return "";
    return block.dataType === "string" ? name + ".data" : name;
  }

  generateOwnCode() {
    const qname = this._el.select.value;
    if (!qname) return "";
    const parts = qname.split("/");
    const procName = parts[1] || qname;

    const inputs = [];
    const outputs = [];
    for (const row of this._el.inputs.querySelectorAll(".proccall-arg-row")) {
      const hook = row.querySelector(".hook");
      const inp = row.querySelector(".proccall-arg-input");
      const source = hook ? findDataSource(hook) : null;
      inputs.push(source ? this._sourceName(source) : (inp.value || inp.placeholder));
    }
    for (const row of this._el.outputs.querySelectorAll(".proccall-arg-row")) {
      const inp = row.querySelector(".proccall-arg-input");
      outputs.push("&" + (inp.value || inp.placeholder));
    }
    const args = [...inputs, ...outputs].join(", ");
    return `\n${procName}(${args});\n`;
  }

  saveData() {
    const args = {};
    for (const inp of this.querySelectorAll(".proccall-arg-input")) {
      args[inp.dataset.dir + ":" + inp.dataset.paramName] = inp.value;
    }
    return { selected: this._el.select.value, name: this._el.nameInput.value, args };
  }
  restoreData(d) {
    if (this._initTimer) { clearTimeout(this._initTimer); this._initTimer = null; }
    this._el.select.dataset.restoredValue = d.selected || "";
    this._el.select.value = d.selected || "";
    this._el.nameInput.value = d.name || "";
    this._rebuildParams();
    if (d.args) {
      for (const inp of this.querySelectorAll(".proccall-arg-input")) {
        const key = inp.dataset.dir + ":" + inp.dataset.paramName;
        if (d.args[key] !== undefined) inp.value = d.args[key];
      }
    }
  }
}