import { SYSTEM } from "../config/system.mjs"

/**
 * Roll configuration dialog for Oath Hammer skill checks.
 * Uses DialogV2.wait() — pattern from fvtt-hellborn / fvtt-lethal-fantasy.
 *
 * Dice rules (from rulebook):
 *   Pool = Attribute rank + Skill rank + per-skill modifier + bonus + (luckSpend × 2) + supporters
 *   White dice: succeed on 4+  |  Red: 3+  |  Black: 2+
 *   All dice explode on 6 (roll extra die).
 *   Luck Points: spending 1 LP adds +2 dice; LP restored each session.
 *   Supporters: each ally with ranks in the skill adds +1 die.
 */
export default class OathHammerRollDialog {
  /**
   * Dual-attribute skills: show an alternate attribute option in the dialog.
   * key → { primary, alt, altLabel i18n key }
   */
  static DUAL_ATTRIBUTE_SKILLS = {
    defense:  { alt: "might",         altLabelKey: "OATHHAMMER.Roll.DualAttr.DefenseMelee" },
    fighting: { alt: "agility",       altLabelKey: "OATHHAMMER.Roll.DualAttr.FightingNimble" },
    magic:    { alt: "intelligence",  altLabelKey: "OATHHAMMER.Roll.DualAttr.MagicSpells" },
  }

  /**
   * Show a skill check dialog and return the user's choices.
   *
   * @param {Actor}  actor     Actor performing the check
   * @param {string} skillKey  SYSTEM.SKILLS key (e.g. "fortune", "fighting")
   * @returns {Promise<{dv, bonus, luckSpend, supporters, attrOverride, visibility}|null>}
   *          Resolved options, or null if the dialog was cancelled.
   */
  static async prompt(actor, skillKey) {
    const sys = actor.system
    const skillDef = SYSTEM.SKILLS[skillKey]
    if (!skillDef) throw new Error(`Unknown skill: ${skillKey}`)

    const defaultAttrKey = skillDef.attribute
    const attrRank       = sys.attributes[defaultAttrKey].rank
    const skill          = sys.skills[skillKey]
    const skillRank      = skill.rank
    const skillMod       = skill.modifier ?? 0
    const baseTotal      = attrRank + skillRank + skillMod
    const colorType      = skill.colorDiceType ?? "white"
    const threshold      = colorType === "black" ? 2 : colorType === "red" ? 3 : 4
    const colorLabel     = colorType === "black" ? "⬛" : colorType === "red" ? "🔴" : "⬜"

    const dualDef = this.DUAL_ATTRIBUTE_SKILLS[skillKey]
    // Build attribute options for dual-attribute skills
    let attrOptions = null
    if (dualDef) {
      const altRank = sys.attributes[dualDef.alt].rank
      attrOptions = [
        {
          value: defaultAttrKey,
          label: `${game.i18n.localize(`OATHHAMMER.Attribute.${defaultAttrKey.charAt(0).toUpperCase()}${defaultAttrKey.slice(1)}`)} (${attrRank}) — default`,
          selected: true,
        },
        {
          value: dualDef.alt,
          label: `${game.i18n.localize(`OATHHAMMER.Attribute.${dualDef.alt.charAt(0).toUpperCase()}${dualDef.alt.slice(1)}`)} (${altRank}) — ${game.i18n.localize(dualDef.altLabelKey)}`,
          selected: false,
        },
      ]
    }

    const availableLuck = sys.luck?.value ?? 0
    const isHuman = (sys.lineage?.name ?? "").toLowerCase() === "human"
    const luckDicePerPoint = isHuman ? 3 : 2
    const rollModes = foundry.utils.duplicate(CONFIG.Dice.rollModes)

    // Build select option arrays
    const dvOptions = Array.from({ length: 11 }, (_, i) => {
      const v = i  // 0..10
      const label = v === 0 ? "0 (opposed)" : String(v)
      return { value: v, label, selected: v === 2 }
    })

    const bonusOptions = Array.from({ length: 13 }, (_, i) => {
      const v = i - 6
      return { value: v, label: v > 0 ? `+${v}` : String(v), selected: v === 0 }
    })

    const supportersOptions = Array.from({ length: 7 }, (_, i) => ({
      value: i, label: String(i), selected: i === 0,
    }))

    const luckOptions = Array.from({ length: availableLuck + 1 }, (_, i) => ({
      value: i,
      label: i === 0 ? `0` : `${i} (+${i * luckDicePerPoint}d)`,
      selected: i === 0,
    }))

    const context = {
      actorName:  actor.name,
      skillKey,
      skillLabel: game.i18n.localize(skillDef.label),
      attrKey:    defaultAttrKey,
      attrLabel:  game.i18n.localize(`OATHHAMMER.Attribute.${defaultAttrKey.charAt(0).toUpperCase()}${defaultAttrKey.slice(1)}`),
      attrRank,
      skillRank,
      skillMod,
      baseTotal,
      colorType,
      colorLabel,
      threshold,
      availableLuck,
      isHuman,
      attrOptions,
      isDualAttr:       !!dualDef,
      rollModes,
      visibility:       game.settings.get("core", "rollMode"),
      dvOptions,
      bonusOptions,
      supportersOptions,
      luckOptions,
    }

    const content = await foundry.applications.handlebars.renderTemplate(
      "systems/fvtt-oath-hammer/templates/roll-dialog.hbs",
      context
    )

    const title = game.i18n.format("OATHHAMMER.Dialog.SkillCheckTitle", { skill: context.skillLabel })

    const result = await foundry.applications.api.DialogV2.wait({
      window:      { title },
      classes:     ["fvtt-oath-hammer"],
      content,
      rejectClose: false,
      buttons: [
        {
          label:    game.i18n.localize("OATHHAMMER.Dialog.Roll"),
          callback: (_event, button) => {
            const out = {}
            for (const el of button.form.elements) {
              if (!el.name) continue
              out[el.name] = el.type === "checkbox" ? String(el.checked) : el.value
            }
            return out
          },
        },
      ],
    })

    if (!result) return null

    const attrOverride = result.attrOverride || defaultAttrKey

    return {
      dv:           Math.max(0, parseInt(result.dv)         ?? 2),
      bonus:        parseInt(result.bonus)                  || 0,
      luckSpend:    Math.min(Math.max(0, parseInt(result.luckSpend) || 0), availableLuck),
      luckIsHuman:  result.luckIsHuman === "true",
      supporters:   Math.max(0, parseInt(result.supporters) || 0),
      explodeOn5:   result.explodeOn5 === "true",
      attrOverride,
      visibility:   result.visibility ?? game.settings.get("core", "rollMode"),
    }
  }
}