import { App, Modal, Setting } from "obsidian";
import { Pair, composeFrontmatter, docFrontmatterToPairs, parseNote } from "./frontmatter";
import { Strategy } from "./images";
import { JekyllPublishSettings } from "./settings";
import { deriveDate, deriveSlug } from "./slug";

export interface ModalResult {
  frontmatterPairs: Pair[];
  slug: string;
  date?: string;
  strategy: Strategy;
  commitMessage: string;
}

export class PublishModal extends Modal {
  private result: ModalResult;
  private mergeDoc = true;
  /** Editable rows = preset fields (seeded from settings) + custom additions. */
  private editableRows: Pair[];
  /** The note's own frontmatter, shown read-only when merge is on. */
  private readonly docPairs: Pair[];
  private fmEl!: HTMLElement;

  constructor(
    app: App,
    settings: JekyllPublishSettings,
    private noteText: string,
    filename: string,
    private onSubmit: (r: ModalResult) => void
  ) {
    super(app);
    const { frontmatter } = parseNote(noteText);
    const title = typeof frontmatter.title === "string" ? frontmatter.title : "";
    this.docPairs = docFrontmatterToPairs(frontmatter);
    // Deep-copy the presets so editing/deleting rows here never mutates the
    // saved settings.
    this.editableRows = settings.presetFrontmatter.map((p) => ({ key: p.key, value: p.value }));
    this.result = {
      frontmatterPairs: [],
      slug: deriveSlug({ title, filename }),
      date: deriveDate({ frontmatterDate: frontmatter.date }),
      strategy: settings.defaultImageStrategy,
      commitMessage: settings.commitMessageTemplate.replace("{{title}}", title || filename),
    };
  }

  private recompute() {
    this.result.frontmatterPairs = composeFrontmatter(this.docPairs, this.editableRows, this.mergeDoc);
  }

  onOpen() {
    this.recompute();
    const { contentEl } = this;
    contentEl.createEl("h2", { text: "Publish to Jekyll" });

    new Setting(contentEl).setName("Slug").addText((t) =>
      t.setValue(this.result.slug).onChange((v) => (this.result.slug = v))
    );
    new Setting(contentEl).setName("Date").addText((t) =>
      t.setValue(this.result.date ?? "").onChange((v) => (this.result.date = v))
    ).setDesc("The date to prepend to the filename. Useful for blog posts.");

    new Setting(contentEl).setName("Image strategy").addDropdown((d) =>
      d.addOption("flat-slug", "Flat, renamed to slug")
        .addOption("per-post-folder", "Per-post subfolder")
        .setValue(this.result.strategy)
        .onChange((v) => (this.result.strategy = v as Strategy))
    );
    new Setting(contentEl)
      .setName("Merge document frontmatter")
      .setDesc("Include the note's own frontmatter (shown read-only below).")
      .addToggle((t) =>
        t.setValue(this.mergeDoc).onChange((v) => {
          this.mergeDoc = v;
          this.renderFrontmatter();
        })
      );

    contentEl.createEl("h3", { text: "Frontmatter" });
    this.fmEl = contentEl.createDiv();
    this.renderFrontmatter();

    new Setting(contentEl).addButton((b) =>
      b.setButtonText("Add property").onClick(() => {
        this.editableRows = [...this.editableRows, { key: "", value: "" }];
        this.renderFrontmatter();
      })
    );
    new Setting(contentEl).setName("Commit message").addText((t) =>
      t.setValue(this.result.commitMessage).onChange((v) => (this.result.commitMessage = v))
    );
    new Setting(contentEl).addButton((b) =>
      b.setButtonText("Publish").setCta().onClick(() => {
        this.recompute();
        this.close();
        this.onSubmit(this.result);
      })
    );
  }

  private renderFrontmatter() {
    this.recompute();
    this.fmEl.empty();

    const editableKeys = new Set(
      this.editableRows.filter((r) => r.key.trim() !== "").map((r) => r.key)
    );

    // Document fields (read-only) first — only those not overridden by an
    // editable row, so the modal never shows a key twice.
    if (this.mergeDoc) {
      const docRows = this.docPairs.filter((p) => !editableKeys.has(p.key));
      for (const p of docRows) {
        const row = this.fmEl.createDiv({ cls: "jekyll-publish-row" });
        const k = row.createEl("input", { cls: "jekyll-publish-doc", value: p.key });
        const v = row.createEl("input", { cls: "jekyll-publish-doc", value: p.value });
        k.disabled = true;
        v.disabled = true;
        k.title = "From the note's frontmatter (edit the note to change)";
        v.title = k.title;
      }
    }

    // Editable rows (presets + custom) — same style, all editable and deletable.
    this.editableRows.forEach((row, i) => {
      const div = this.fmEl.createDiv({ cls: "jekyll-publish-row" });
      const k = div.createEl("input", { value: row.key, placeholder: "key" });
      const v = div.createEl("input", { value: row.value, placeholder: "value" });
      k.oninput = () => {
        this.editableRows = this.editableRows.map((r, j) => (j === i ? { ...r, key: k.value } : r));
        this.recompute();
      };
      v.oninput = () => {
        this.editableRows = this.editableRows.map((r, j) => (j === i ? { ...r, value: v.value } : r));
        this.recompute();
      };
      const del = div.createEl("button", { cls: "jekyll-publish-del", text: "×" });
      del.setAttr("aria-label", "Delete property");
      del.onclick = () => {
        this.editableRows = this.editableRows.filter((_, j) => j !== i);
        this.renderFrontmatter();
      };
    });
  }

  onClose() {
    this.contentEl.empty();
  }
}