import { App, Modal, Notice, Setting } from "obsidian";
import { ParsedReminderInput } from "../types";

export class ReminderModal extends Modal {
  private title = "";
  private body = "";
  private year = "";
  private month = "";
  private day = "";
  private hour = "";
  private minute = "";
  private channels = "";

  constructor(
    app: App,
    private defaultChannels: string[],
    private onSubmit: (input: ParsedReminderInput) => Promise<void>,
    initialTitle = "",
  ) {
    super(app);
    const initialDate = new Date(Date.now() + 60 * 60 * 1000);
    this.title = initialTitle;
    this.body = initialTitle;
    this.channels = defaultChannels.join(", ");
    this.year = String(initialDate.getFullYear());
    this.month = String(initialDate.getMonth() + 1).padStart(2, "0");
    this.day = String(initialDate.getDate()).padStart(2, "0");
    this.hour = String(initialDate.getHours()).padStart(2, "0");
    this.minute = String(Math.ceil(initialDate.getMinutes() / 5) * 5).padStart(2, "0");
    if (this.minute === "60") {
      this.minute = "00";
      this.hour = String((initialDate.getHours() + 1) % 24).padStart(2, "0");
    }
  }

  onOpen(): void {
    const { contentEl } = this;
    contentEl.empty();
    contentEl.createEl("h2", { text: "Create reminder" });

    this.renderReminderRow(contentEl);

    new Setting(contentEl)
      .setName("Details")
      .setDesc("Optional longer message.")
      .addTextArea((text) => {
        text.setValue(this.body);
        text.inputEl.rows = 3;
        text.onChange((value) => {
          this.body = value;
        });
      });

    new Setting(contentEl)
      .setName("Channels")
      .setDesc("Comma separated provider IDs or types. Leave empty to use all enabled providers.")
      .addText((text) => text
        .setValue(this.channels)
        .onChange((value) => {
          this.channels = value;
        }));

    new Setting(contentEl)
      .addButton((button) => button
        .setButtonText("Create")
        .setCta()
        .onClick(async () => {
          const dueAt = this.getSelectedDate();
          if (!this.title.trim() || !dueAt) {
            new Notice("Title and valid due date are required.");
            return;
          }

          await this.onSubmit({
            title: this.title.trim(),
            body: this.body.trim(),
            dueAt: dueAt.toISOString(),
            channels: this.channels.split(",").map((value) => value.trim()).filter(Boolean),
          });
          this.close();
        }));
  }

  private renderReminderRow(container: HTMLElement): void {
    const setting = new Setting(container)
      .setName("Reminder")
      .setDesc("Text, date, and time.");

    setting.addText((text) => {
      text.setPlaceholder("Reminder text");
      text.setValue(this.title);
      text.onChange((value) => {
        this.title = value;
        if (!this.body || this.body === this.title) {
          this.body = value;
        }
      });
    });

    setting.addDropdown((dropdown) => {
      for (const year of this.range(new Date().getFullYear(), new Date().getFullYear() + 3)) {
        dropdown.addOption(String(year), String(year));
      }
      dropdown.setValue(this.year);
      dropdown.onChange((value) => {
        this.year = value;
        this.ensureValidDay();
      });
    });

    setting.addDropdown((dropdown) => {
      for (const month of this.range(1, 12)) {
        const value = String(month).padStart(2, "0");
        dropdown.addOption(value, value);
      }
      dropdown.setValue(this.month);
      dropdown.onChange((value) => {
        this.month = value;
        this.ensureValidDay();
      });
    });

    setting.addDropdown((dropdown) => {
      for (const day of this.range(1, 31)) {
        const value = String(day).padStart(2, "0");
        dropdown.addOption(value, value);
      }
      dropdown.setValue(this.day);
      dropdown.onChange((value) => {
        this.day = value;
      });
    });

    setting.addDropdown((dropdown) => {
      for (const hour of this.range(0, 23)) {
        const value = String(hour).padStart(2, "0");
        dropdown.addOption(value, value);
      }
      dropdown.setValue(this.hour);
      dropdown.onChange((value) => {
        this.hour = value;
      });
    });

    setting.addDropdown((dropdown) => {
      for (const minute of this.range(0, 55, 5)) {
        const value = String(minute).padStart(2, "0");
        dropdown.addOption(value, value);
      }
      dropdown.setValue(this.minute);
      dropdown.onChange((value) => {
        this.minute = value;
      });
    });
  }

  private getSelectedDate(): Date | null {
    const date = new Date(`${this.year}-${this.month}-${this.day}T${this.hour}:${this.minute}:00`);
    return Number.isNaN(date.getTime()) ? null : date;
  }

  private ensureValidDay(): void {
    const maxDay = new Date(Number(this.year), Number(this.month), 0).getDate();
    if (Number(this.day) > maxDay) {
      this.day = String(maxDay).padStart(2, "0");
    }
  }

  private range(from: number, to: number, step = 1): number[] {
    const values: number[] = [];
    for (let value = from; value <= to; value += step) {
      values.push(value);
    }
    return values;
  }
}