// mime-todo/lib/issue.ts


export type RelationshipKind = "dependsOn" | "relatesTo" | "blocks"

export interface IssueRelationships {
  [kind: string]: number[]
}

export type IssueType = "feature" | "bugfix" | "hotfix"
export type IssueStatus = "open" | "in-progress" | "done" | "hold" | "cancelled"
export type IssuePriority = "low" | "medium" | "high"

export interface Issue {
  id: number
  type: IssueType
  title: string
  status: IssueStatus
  priority: IssuePriority
  created: string // YYYY-MM-DD
  relationships: IssueRelationships
  dueStart?: string // YYYY-MM-DD
  dueEnd?: string   // YYYY-MM-DD
  description: string
  body: string
}

export function parseRelationships(text: string): IssueRelationships {
  const relationships: IssueRelationships = {}
  
  // Handle empty relationships
  if (!text || text.trim() === "") {
    return relationships
  }
  
  // Simple parsing for format like "dependsOn:3"
  const parts = text.split(/,\s*/).filter(p => p.trim() !== "")
  for (const part of parts) {
    const [key, value] = part.split(":").map(s => s.trim())
    if (key && value) {
      relationships[key] = value.split(/[\s]+/).map(Number).filter(n => !isNaN(n))
    }
  }
  
  return relationships
}

export function parseIssue(text: string): Issue {
  const lines = text.split(/\r?\n/)
  const issue: Partial<Issue> = {}

  let inDescription = false
  const descLines: string[] = []
  const bodyLines: string[] = []

  for (const line of lines) {
    if (!inDescription) {
      if (line.startsWith("ID:")) issue.id = Number(line.slice(3).trim())
      else if (line.startsWith("Type:")) issue.type = line.slice(5).trim()
      else if (line.startsWith("Title:")) issue.title = line.slice(6).trim()
      else if (line.startsWith("Status:")) issue.status = line.slice(7).trim()
      else if (line.startsWith("Priority:")) issue.priority = line.slice(9).trim()
      else if (line.startsWith("Created:")) issue.created = line.slice(8).trim()
      else if (line.startsWith("DueStart:")) issue.dueStart = line.slice(9).trim()
      else if (line.startsWith("DueEnd:")) issue.dueEnd = line.slice(7).trim()
      else if (line.startsWith("Relationships:")) {
        const rel = line.slice("Relationships:".length).trim()
        issue.relationships = parseRelationships(rel)
      }
      else if (line.startsWith("Description:")) {
        inDescription = true
        descLines.push(line.slice("Description:".length).trim())
      }
    } else {
      // Description continuation
      if (line.trim() === "") {
        // blank line ends description
        inDescription = false
        continue
      }

      if (/^\s+/.test(line)) {
        descLines.push(line.trim())
        continue
      }

      // first non-indented line ends description
      inDescription = false
      bodyLines.push(line)
    }
  }

  issue.description = descLines.join("\n")
  issue.body = bodyLines.join("\n")

  return issue as Issue
}